Grease Pencil v2 Branch

Improve current Grease Pencil in order to get a better 2D animation tool.

More info in WIKI pages: https://wiki.blender.org/index.php/User:Antoniov

Reviewed By: Severin, aligorith, campbellbarton

Patch by @antoniov, with edits by @Severin.

Differential Revision: https://developer.blender.org/D2115

24 files changed, 4068 insertions, 503 deletions

diff --git a/source/blender/editors/animation/anim_channels_defines.c b/source/blender/editors/animation/anim_channels_defines.c
index ea2f7fc5588..752544f65e1 100644
--- a/source/blender/editors/animation/anim_channels_defines.c
+++ b/source/blender/editors/animation/anim_channels_defines.c
@@ -4208,6 +4208,8 @@ void ANIM_channel_draw_widgets(const bContext *C, bAnimContext *ac, bAnimListEle
 			offset += ICON_WIDTH; 
 		}
 		else if (ale->type == ANIMTYPE_GPLAYER) {
+#if 0
+			/* XXX: Maybe need a better design */
 			/* color swatch for layer color */
 			bGPDlayer *gpl = (bGPDlayer *)ale->data;
 			PointerRNA ptr;
@@ -4216,7 +4218,6 @@ void ANIM_channel_draw_widgets(const bContext *C, bAnimContext *ac, bAnimListEle
 			RNA_pointer_create(ale->id, &RNA_GPencilLayer, ale->data, &ptr);
 			
 			UI_block_align_begin(block);
-			
 			UI_block_emboss_set(block, RNA_boolean_get(&ptr, "is_stroke_visible") ? UI_EMBOSS : UI_EMBOSS_NONE);
 			uiDefButR(block, UI_BTYPE_COLOR, 1, "", offset, yminc, w, ICON_WIDTH, 
 			          &ptr, "color", -1, 
@@ -4226,11 +4227,11 @@ void ANIM_channel_draw_widgets(const bContext *C, bAnimContext *ac, bAnimListEle
 			uiDefButR(block, UI_BTYPE_COLOR, 1, "", offset + w, yminc, w, ICON_WIDTH, 
 			          &ptr, "fill_color", -1, 
 			          0, 0, 0, 0, gpl->info);
-			
 			UI_block_emboss_set(block, UI_EMBOSS_NONE);
 			UI_block_align_end(block);
-			
+
 			offset += ICON_WIDTH;
+#endif
 		}
 	}
 	
diff --git a/source/blender/editors/gpencil/drawgpencil.c b/source/blender/editors/gpencil/drawgpencil.c
index 79a2c494239..bd09616243b 100644
--- a/source/blender/editors/gpencil/drawgpencil.c
+++ b/source/blender/editors/gpencil/drawgpencil.c
@@ -18,7 +18,7 @@
  * The Original Code is Copyright (C) 2008, Blender Foundation
  * This is a new part of Blender
  *
- * Contributor(s): Joshua Leung
+ * Contributor(s): Joshua Leung, Antonio Vazquez
  *
  * ***** END GPL LICENSE BLOCK *****
  */
@@ -52,6 +52,7 @@
 #include "DNA_space_types.h"
 #include "DNA_view3d_types.h"
 #include "DNA_userdef_types.h"
+#include "DNA_object_types.h"
 
 #include "BKE_context.h"
 #include "BKE_global.h"
@@ -94,9 +95,32 @@ typedef enum eDrawStrokeFlags {
 #define GP_DRAWTHICKNESS_SPECIAL    3
 
 /* ----- Tool Buffer Drawing ------ */
+/* helper function to set color of buffer point */
+static void gp_set_tpoint_color(tGPspoint *pt, float ink[4])
+{
+	float alpha = ink[3] * pt->strength;
+	CLAMP(alpha, GPENCIL_STRENGTH_MIN, 1.0f);
+	glColor4f(ink[0], ink[1], ink[2], alpha);
+}
+
+/* helper function to set color of point */
+static void gp_set_point_color(bGPDspoint *pt, float ink[4])
+{
+	float alpha = ink[3] * pt->strength;
+	CLAMP(alpha, GPENCIL_STRENGTH_MIN, 1.0f);
+	glColor4f(ink[0], ink[1], ink[2], alpha);
+}
+
+/* helper function to set color and point */
+static void gp_set_color_and_tpoint(tGPspoint *pt, float ink[4])
+{
+	gp_set_tpoint_color(pt, ink);
+	glVertex2iv(&pt->x);
+}
 
 /* draw stroke defined in buffer (simple ogl lines/points for now, as dotted lines) */
-static void gp_draw_stroke_buffer(tGPspoint *points, int totpoints, short thickness, short dflag, short sflag)
+static void gp_draw_stroke_buffer(tGPspoint *points, int totpoints, short thickness,
+                                  short dflag, short sflag, float ink[4])
 {
 	tGPspoint *pt;
 	int i;
@@ -113,7 +137,8 @@ static void gp_draw_stroke_buffer(tGPspoint *points, int totpoints, short thickn
 		/* if drawing a single point, draw it larger */
 		glPointSize((float)(thickness + 2) * points->pressure);
 		glBegin(GL_POINTS);
-		glVertex2iv(&points->x);
+
+		gp_set_color_and_tpoint(points, ink);
 		glEnd();
 	}
 	else if (sflag & GP_STROKE_ERASER) {
@@ -138,15 +163,18 @@ static void gp_draw_stroke_buffer(tGPspoint *points, int totpoints, short thickn
 				glBegin(GL_LINE_STRIP);
 				
 				/* need to roll-back one point to ensure that there are no gaps in the stroke */
-				if (i != 0) glVertex2iv(&(pt - 1)->x);
+				if (i != 0) { 
+					gp_set_color_and_tpoint((pt - 1), ink);
+				}
 				
 				/* now the point we want... */
-				glVertex2iv(&pt->x);
+				gp_set_color_and_tpoint(pt, ink);
 				
 				oldpressure = pt->pressure;
 			}
-			else
-				glVertex2iv(&pt->x);
+			else {
+				gp_set_color_and_tpoint(pt, ink);
+			}
 		}
 		glEnd();
 
@@ -155,37 +183,35 @@ static void gp_draw_stroke_buffer(tGPspoint *points, int totpoints, short thickn
 }
 
 /* --------- 2D Stroke Drawing Helpers --------- */
-
-/* helper function to calculate x-y drawing coordinates for 2D points */
-static void gp_calc_2d_stroke_xy(bGPDspoint *pt, short sflag, int offsx, int offsy, int winx, int winy, float r_co[2])
+/* change in parameter list */
+static void gp_calc_2d_stroke_fxy(float pt[3], short sflag, int offsx, int offsy, int winx, int winy, float r_co[2])
 {
 	if (sflag & GP_STROKE_2DSPACE) {
-		r_co[0] = pt->x;
-		r_co[1] = pt->y;
+		r_co[0] = pt[0];
+		r_co[1] = pt[1];
 	}
 	else if (sflag & GP_STROKE_2DIMAGE) {
-		const float x = (float)((pt->x * winx) + offsx);
-		const float y = (float)((pt->y * winy) + offsy);
-		
+		const float x = (float)((pt[0] * winx) + offsx);
+		const float y = (float)((pt[1] * winy) + offsy);
+
 		r_co[0] = x;
 		r_co[1] = y;
 	}
 	else {
-		const float x = (float)(pt->x / 100 * winx) + offsx;
-		const float y = (float)(pt->y / 100 * winy) + offsy;
-		
+		const float x = (float)(pt[0] / 100 * winx) + offsx;
+		const float y = (float)(pt[1] / 100 * winy) + offsy;
+
 		r_co[0] = x;
 		r_co[1] = y;
 	}
 }
-
 /* ----------- Volumetric Strokes --------------- */
 
 /* draw a 2D buffer stroke in "volumetric" style
  * NOTE: the stroke buffer doesn't have any coordinate offsets/transforms
  */
 static void gp_draw_stroke_volumetric_buffer(tGPspoint *points, int totpoints, short thickness,
-                                             short dflag, short UNUSED(sflag))
+                                             short dflag, short UNUSED(sflag), float ink[4])
 {
 	GLUquadricObj *qobj = gluNewQuadric();
 	float modelview[4][4];
@@ -216,6 +242,7 @@ static void gp_draw_stroke_volumetric_buffer(tGPspoint *points, int totpoints, s
 		glLoadMatrixf((float *)modelview);
 		
 		/* draw the disk using the current state... */
+		gp_set_tpoint_color(pt, ink);
 		gluDisk(qobj, 0.0,  pt->pressure * thickness, 32, 1);
 		
 		
@@ -229,7 +256,8 @@ static void gp_draw_stroke_volumetric_buffer(tGPspoint *points, int totpoints, s
 /* draw a 2D strokes in "volumetric" style */
 static void gp_draw_stroke_volumetric_2d(bGPDspoint *points, int totpoints, short thickness,
                                          short dflag, short sflag,
-                                         int offsx, int offsy, int winx, int winy)
+                                         int offsx, int offsy, int winx, int winy,
+                                         float diff_mat[4][4], float ink[4])
 {
 	GLUquadricObj *qobj = gluNewQuadric();
 	float modelview[4][4];
@@ -238,7 +266,7 @@ static void gp_draw_stroke_volumetric_2d(bGPDspoint *points, int totpoints, shor
 	
 	bGPDspoint *pt;
 	int i;
-	
+	float fpt[3];
 	
 	/* HACK: We need a scale factor for the drawing in the image editor,
 	 * which seems to use 1 unit as it's maximum size, whereas everything
@@ -256,10 +284,14 @@ static void gp_draw_stroke_volumetric_2d(bGPDspoint *points, int totpoints, shor
 	glPushMatrix();
 	
 	for (i = 0, pt = points; i < totpoints; i++, pt++) {
+		/* color of point */
+		gp_set_point_color(pt, ink);
+
 		/* set the transformed position */
 		float co[2];
 		
-		gp_calc_2d_stroke_xy(pt, sflag, offsx, offsy, winx, winy, co);
+		mul_v3_m4v3(fpt, diff_mat, &pt->x);
+		gp_calc_2d_stroke_fxy(fpt, sflag, offsx, offsy, winx, winy, co);
 		translate_m4(modelview, co[0], co[1], 0.0f);
 		
 		glLoadMatrixf((float *)modelview);
@@ -276,8 +308,9 @@ static void gp_draw_stroke_volumetric_2d(bGPDspoint *points, int totpoints, shor
 }
 
 /* draw a 3D stroke in "volumetric" style */
-static void gp_draw_stroke_volumetric_3d(bGPDspoint *points, int totpoints, short thickness,
-                                         short UNUSED(dflag), short UNUSED(sflag))
+static void gp_draw_stroke_volumetric_3d(
+        bGPDspoint *points, int totpoints, short thickness,
+        short UNUSED(dflag), short UNUSED(sflag), float diff_mat[4][4], float ink[4])
 {
 	GLUquadricObj *qobj = gluNewQuadric();
 	
@@ -286,7 +319,7 @@ static void gp_draw_stroke_volumetric_3d(bGPDspoint *points, int totpoints, shor
 	
 	bGPDspoint *pt;
 	int i;
-	
+	float fpt[3];
 	
 	/* Get the basic modelview matrix we use for performing calculations */
 	glGetFloatv(GL_MODELVIEW_MATRIX, (float *)base_modelview);
@@ -305,8 +338,13 @@ static void gp_draw_stroke_volumetric_3d(bGPDspoint *points, int totpoints, shor
 	glPushMatrix();
 	
 	for (i = 0, pt = points; i < totpoints && pt; i++, pt++) {
+		/* color of point */
+		gp_set_point_color(pt, ink);
+
+		mul_v3_m4v3(fpt, diff_mat, &pt->x);
+
 		/* apply translation to base_modelview, so that the translated point is put in the right place */
-		translate_m4(base_modelview, pt->x, pt->y, pt->z);
+		translate_m4(base_modelview, fpt[0], fpt[1], fpt[2]);
 		
 		/* copy the translation component to the billboard matrix we're going to use,
 		 * then reset the base matrix to the original values so that we can do the same
@@ -378,9 +416,9 @@ static void gp_stroke_2d_flat(bGPDspoint *points, int totpoints, float(*points2d
 static void gp_triangulate_stroke_fill(bGPDstroke *gps)
 {
 	BLI_assert(gps->totpoints >= 3);
-	gps->tot_triangles = gps->totpoints - 2;
-
+	
 	/* allocate memory for temporary areas */
+	gps->tot_triangles = gps->totpoints - 2;
 	unsigned int (*tmp_triangles)[3] = MEM_mallocN(sizeof(*tmp_triangles) * gps->tot_triangles, "GP Stroke temp triangulation");
 	float (*points2d)[2] = MEM_mallocN(sizeof(*points2d) * gps->totpoints, "GP Stroke temp 2d points");
 	
@@ -390,6 +428,8 @@ static void gp_triangulate_stroke_fill(bGPDstroke *gps)
 	gp_stroke_2d_flat(gps->points, gps->totpoints, points2d, &direction);
 	BLI_polyfill_calc((const float(*)[2])points2d, (unsigned int)gps->totpoints, direction, (unsigned int(*)[3])tmp_triangles);
 
+	/* Number of triangles */
+	gps->tot_triangles = gps->totpoints - 2;
 	/* save triangulation data in stroke cache */
 	if (gps->tot_triangles > 0) {
 		if (gps->triangles == NULL) {
@@ -399,9 +439,7 @@ static void gp_triangulate_stroke_fill(bGPDstroke *gps)
 			gps->triangles = MEM_recallocN(gps->triangles, sizeof(*gps->triangles) * gps->tot_triangles);
 		}
 		
-		int i;
-		
-		for (i = 0; i < gps->tot_triangles; i++) {
+		for (int i = 0; i < gps->tot_triangles; i++) {
 			bGPDtriangle *stroke_triangle = &gps->triangles[i];
 			stroke_triangle->v1 = tmp_triangles[i][0];
 			stroke_triangle->v2 = tmp_triangles[i][1];
@@ -428,21 +466,27 @@ static void gp_triangulate_stroke_fill(bGPDstroke *gps)
 
 
 /* draw fills for shapes */
-static void gp_draw_stroke_fill(bGPDstroke *gps, short UNUSED(thickness), short dflag, int offsx, int offsy, int winx, int winy)
+static void gp_draw_stroke_fill(
+        bGPdata *gpd, bGPDstroke *gps,
+        int offsx, int offsy, int winx, int winy, float diff_mat[4][4])
 {
+	bGPDpalettecolor *palcolor;
+	int i;
+	float fpt[3];
+
 	BLI_assert(gps->totpoints >= 3);
-	
+
+	palcolor = ED_gpencil_stroke_getcolor(gpd, gps);
+
 	/* Triangulation fill if high quality flag is enabled */
-	if (dflag & GP_DRAWDATA_HQ_FILL) {
+	if (palcolor->flag & PC_COLOR_HQ_FILL) {
 		bGPDtriangle *stroke_triangle;
 		bGPDspoint *pt;
-		int i;
-		
+
 		/* Calculate triangles cache for filling area (must be done only after changes) */
 		if ((gps->flag & GP_STROKE_RECALC_CACHES) || (gps->tot_triangles == 0) || (gps->triangles == NULL)) {
 			gp_triangulate_stroke_fill(gps);
 		}
-		
 		/* Draw all triangles for filling the polygon (cache must be calculated before) */
 		BLI_assert(gps->tot_triangles >= 1);
 		glBegin(GL_TRIANGLES);
@@ -450,32 +494,33 @@ static void gp_draw_stroke_fill(bGPDstroke *gps, short UNUSED(thickness), short
 			if (gps->flag & GP_STROKE_3DSPACE) {
 				/* vertex 1 */
 				pt = &gps->points[stroke_triangle->v1];
-				glVertex3fv(&pt->x);
-				
+				mul_v3_m4v3(fpt, diff_mat, &pt->x);
+				glVertex3fv(fpt);
 				/* vertex 2 */
 				pt = &gps->points[stroke_triangle->v2];
-				glVertex3fv(&pt->x);
-				
+				mul_v3_m4v3(fpt, diff_mat, &pt->x);
+				glVertex3fv(fpt);
 				/* vertex 3 */
 				pt = &gps->points[stroke_triangle->v3];
-				glVertex3fv(&pt->x);
+				mul_v3_m4v3(fpt, diff_mat, &pt->x);
+				glVertex3fv(fpt);
 			}
 			else {
 				float co[2];
-				
 				/* vertex 1 */
 				pt = &gps->points[stroke_triangle->v1];
-				gp_calc_2d_stroke_xy(pt, gps->flag, offsx, offsy, winx, winy, co);
+				mul_v3_m4v3(fpt, diff_mat, &pt->x);
+				gp_calc_2d_stroke_fxy(fpt, gps->flag, offsx, offsy, winx, winy, co);
 				glVertex2fv(co);
-				
 				/* vertex 2 */
 				pt = &gps->points[stroke_triangle->v2];
-				gp_calc_2d_stroke_xy(pt, gps->flag, offsx, offsy, winx, winy, co);
+				mul_v3_m4v3(fpt, diff_mat, &pt->x);
+				gp_calc_2d_stroke_fxy(fpt, gps->flag, offsx, offsy, winx, winy, co);
 				glVertex2fv(co);
-				
 				/* vertex 3 */
 				pt = &gps->points[stroke_triangle->v3];
-				gp_calc_2d_stroke_xy(pt, gps->flag, offsx, offsy, winx, winy, co);
+				mul_v3_m4v3(fpt, diff_mat, &pt->x);
+				gp_calc_2d_stroke_fxy(fpt, gps->flag, offsx, offsy, winx, winy, co);
 				glVertex2fv(co);
 			}
 		}
@@ -483,30 +528,31 @@ static void gp_draw_stroke_fill(bGPDstroke *gps, short UNUSED(thickness), short
 	}
 	else {
 		/* As an initial implementation, we use the OpenGL filled polygon drawing
-		 * here since it's the easiest option to implement for this case. It does
-		 * come with limitations (notably for concave shapes), though it works well
-		 * enough for many simple situations.
-		 *
-		 * We keep this legacy implementation around despite now having the high quality
-		 * fills, as this is necessary for keeping everything working nicely for files
-		 * created using old versions of Blender which may have depended on the artifacts
-		 * the old fills created.
-		 */
+		* here since it's the easiest option to implement for this case. It does
+		* come with limitations (notably for concave shapes), though it shouldn't
+		* be much of an issue in most cases.
+		*
+		* We keep this legacy implementation around despite now having the high quality
+		* fills, as this is necessary for keeping everything working nicely for files
+		* created using old versions of Blender which may have depended on the artifacts
+		* the old fills created.
+		*/
 		bGPDspoint *pt;
-		int i;
-		
+
 		glBegin(GL_POLYGON);
 		for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
 			if (gps->flag & GP_STROKE_3DSPACE) {
-				glVertex3fv(&pt->x);
+				mul_v3_m4v3(fpt, diff_mat, &pt->x);
+				glVertex3fv(fpt);
 			}
 			else {
 				float co[2];
-				
-				gp_calc_2d_stroke_xy(pt, gps->flag, offsx, offsy, winx, winy, co);
+				mul_v3_m4v3(fpt, diff_mat, &pt->x);
+				gp_calc_2d_stroke_fxy(fpt, gps->flag, offsx, offsy, winx, winy, co);
 				glVertex2fv(co);
 			}
 		}
+
 		glEnd();
 	}
 }
@@ -514,23 +560,33 @@ static void gp_draw_stroke_fill(bGPDstroke *gps, short UNUSED(thickness), short
 /* ----- Existing Strokes Drawing (3D and Point) ------ */
 
 /* draw a given stroke - just a single dot (only one point) */
-static void gp_draw_stroke_point(bGPDspoint *points, short thickness, short dflag, short sflag,
-                                 int offsx, int offsy, int winx, int winy)
+static void gp_draw_stroke_point(
+        bGPDspoint *points, short thickness, short dflag, short sflag,
+        int offsx, int offsy, int winx, int winy, float diff_mat[4][4], float ink[4])
 {
+	float fpt[3];
+	bGPDspoint *pt = &points[0];
+
+	/* color of point */
+	gp_set_point_color(pt, ink);
+
 	/* set point thickness (since there's only one of these) */
 	glPointSize((float)(thickness + 2) * points->pressure);
 	
+	/* get final position using parent matrix */
+	mul_v3_m4v3(fpt, diff_mat, &pt->x);
+
 	/* draw point */
 	if (sflag & GP_STROKE_3DSPACE) {
 		glBegin(GL_POINTS);
-		glVertex3fv(&points->x);
+		glVertex3fv(fpt);
 		glEnd();
 	}
 	else {
 		float co[2];
 		
 		/* get coordinates of point */
-		gp_calc_2d_stroke_xy(points, sflag, offsx, offsy, winx, winy, co);
+		gp_calc_2d_stroke_fxy(fpt, sflag, offsx, offsy, winx, winy, co);
 		
 		/* if thickness is less than GP_DRAWTHICKNESS_SPECIAL, simple dot looks ok
 		 *  - also mandatory in if Image Editor 'image-based' dot
@@ -559,16 +615,21 @@ static void gp_draw_stroke_point(bGPDspoint *points, short thickness, short dfla
 }
 
 /* draw a given stroke in 3d (i.e. in 3d-space), using simple ogl lines */
-static void gp_draw_stroke_3d(bGPDspoint *points, int totpoints, short thickness, bool debug, short UNUSED(sflag))
+static void gp_draw_stroke_3d(bGPDspoint *points, int totpoints, short thickness, bool debug,
+                              short UNUSED(sflag), float diff_mat[4][4], float ink[4], bool cyclic)
 {
-	bGPDspoint *pt;
+	bGPDspoint *pt, *pt2;
 	float curpressure = points[0].pressure;
 	int i;
-	
+	float fpt[3];
+	float cyclic_fpt[3];
+
 	/* draw stroke curve */
 	glLineWidth(max_ff(curpressure * thickness, 1.0f));
 	glBegin(GL_LINE_STRIP);
 	for (i = 0, pt = points; i < totpoints && pt; i++, pt++) {
+		gp_set_point_color(pt, ink);
+
 		/* if there was a significant pressure change, stop the curve, change the thickness of the stroke,
 		 * and continue drawing again (since line-width cannot change in middle of GL_LINE_STRIP)
 		 * Note: we want more visible levels of pressures when thickness is bigger.
@@ -580,15 +641,29 @@ static void gp_draw_stroke_3d(bGPDspoint *points, int totpoints, short thickness
 			glBegin(GL_LINE_STRIP);
 			
 			/* need to roll-back one point to ensure that there are no gaps in the stroke */
-			if (i != 0) glVertex3fv(&(pt - 1)->x);
+			if (i != 0) { 
+				pt2 = pt - 1;
+				mul_v3_m4v3(fpt, diff_mat, &pt2->x);
+				glVertex3fv(fpt);
+			}
 			
 			/* now the point we want... */
-			glVertex3fv(&pt->x);
+			mul_v3_m4v3(fpt, diff_mat, &pt->x);
+			glVertex3fv(fpt);
 		}
 		else {
-			glVertex3fv(&pt->x);
+			mul_v3_m4v3(fpt, diff_mat, &pt->x);
+			glVertex3fv(fpt);
+		}
+		/* saves first point to use in cyclic */
+		if (i == 0) {
+			copy_v3_v3(cyclic_fpt, fpt);
 		}
 	}
+	/* if cyclic draw line to first point */
+	if (cyclic) {
+		glVertex3fv(cyclic_fpt);
+	}
 	glEnd();
 
 	/* draw debug points of curve on top? */
@@ -597,9 +672,12 @@ static void gp_draw_stroke_3d(bGPDspoint *points, int totpoints, short thickness
 		glPointSize((float)(thickness + 2));
 		
 		glBegin(GL_POINTS);
-		for (i = 0, pt = points; i < totpoints && pt; i++, pt++)
-			glVertex3fv(&pt->x);
+		for (i = 0, pt = points; i < totpoints && pt; i++, pt++) {
+			mul_v3_m4v3(fpt, diff_mat, &pt->x);
+			glVertex3fv(fpt);
+		}
 		glEnd();
+
 	}
 }
 
@@ -607,7 +685,7 @@ static void gp_draw_stroke_3d(bGPDspoint *points, int totpoints, short thickness
 
 /* draw a given stroke in 2d */
 static void gp_draw_stroke_2d(bGPDspoint *points, int totpoints, short thickness_s, short dflag, short sflag,
-                              bool debug, int offsx, int offsy, int winx, int winy)
+                              bool debug, int offsx, int offsy, int winx, int winy, float diff_mat[4][4], float ink[4])
 {
 	/* otherwise thickness is twice that of the 3D view */
 	float thickness = (float)thickness_s * 0.5f;
@@ -625,6 +703,7 @@ static void gp_draw_stroke_2d(bGPDspoint *points, int totpoints, short thickness
 		bGPDspoint *pt1, *pt2;
 		float pm[2];
 		int i;
+		float fpt[3];
 		
 		glShadeModel(GL_FLAT);
 		glBegin(GL_QUADS);
@@ -635,10 +714,13 @@ static void gp_draw_stroke_2d(bGPDspoint *points, int totpoints, short thickness
 			float m1[2], m2[2];     /* gradient and normal */
 			float mt[2], sc[2];     /* gradient for thickness, point for end-cap */
 			float pthick;           /* thickness at segment point */
-			
+
 			/* get x and y coordinates from points */
-			gp_calc_2d_stroke_xy(pt1, sflag, offsx, offsy, winx, winy, s0);
-			gp_calc_2d_stroke_xy(pt2, sflag, offsx, offsy, winx, winy, s1);
+			mul_v3_m4v3(fpt, diff_mat, &pt1->x);
+			gp_calc_2d_stroke_fxy(fpt, sflag, offsx, offsy, winx, winy, s0);
+
+			mul_v3_m4v3(fpt, diff_mat, &pt2->x);
+			gp_calc_2d_stroke_fxy(fpt, sflag, offsx, offsy, winx, winy, s1);
 			
 			/* calculate gradient and normal - 'angle'=(ny/nx) */
 			m1[1] = s1[1] - s0[1];
@@ -650,6 +732,9 @@ static void gp_draw_stroke_2d(bGPDspoint *points, int totpoints, short thickness
 			/* always use pressure from first point here */
 			pthick = (pt1->pressure * thickness * scalefac);
 			
+			/* color of point */
+			gp_set_point_color(pt1, ink);
+
 			/* if the first segment, start of segment is segment's normal */
 			if (i == 0) {
 				/* draw start cap first
@@ -725,6 +810,9 @@ static void gp_draw_stroke_2d(bGPDspoint *points, int totpoints, short thickness
 				/* for once, we use second point's pressure (otherwise it won't be drawn) */
 				pthick = (pt2->pressure * thickness * scalefac);
 				
+				/* color of point */
+				gp_set_point_color(pt2, ink);
+
 				/* calculate points for end of segment */
 				mt[0] = m2[0] * pthick;
 				mt[1] = m2[1] * pthick;
@@ -770,14 +858,15 @@ static void gp_draw_stroke_2d(bGPDspoint *points, int totpoints, short thickness
 	if (debug) {
 		bGPDspoint *pt;
 		int i;
-		
+		float fpt[3];
+
 		glPointSize((float)(thickness_s + 2));
 		
 		glBegin(GL_POINTS);
 		for (i = 0, pt = points; i < totpoints && pt; i++, pt++) {
 			float co[2];
-			
-			gp_calc_2d_stroke_xy(pt, sflag, offsx, offsy, winx, winy, co);
+			mul_v3_m4v3(fpt, diff_mat, &pt->x);
+			gp_calc_2d_stroke_fxy(fpt, sflag, offsx, offsy, winx, winy, co);
 			glVertex2fv(co);
 		}
 		glEnd();
@@ -818,26 +907,45 @@ static bool gp_can_draw_stroke(const bGPDstroke *gps, const int dflag)
 }
 
 /* draw a set of strokes */
-static void gp_draw_strokes(bGPDframe *gpf, int offsx, int offsy, int winx, int winy, int dflag,
-                            bool debug, short lthick, const float color[4], const float fill_color[4])
+static void gp_draw_strokes(
+        bGPdata *gpd, bGPDframe *gpf, int offsx, int offsy, int winx, int winy, int dflag,
+        bool debug, short lthick, const float opacity, const float tintcolor[4],
+        const bool onion, const bool custonion, float diff_mat[4][4])
 {
 	bGPDstroke *gps;
-	
+	float tcolor[4];
+	float tfill[4];
+	short sthickness;
+	float ink[4];
+
 	for (gps = gpf->strokes.first; gps; gps = gps->next) {
 		/* check if stroke can be drawn */
-		if (gp_can_draw_stroke(gps, dflag) == false)
+		if (gp_can_draw_stroke(gps, dflag) == false) {
 			continue;
-		
+		}
+		/* check if the color is visible */
+		bGPDpalettecolor *palcolor = ED_gpencil_stroke_getcolor(gpd, gps);
+		if ((palcolor == NULL) ||
+		    (palcolor->flag & PC_COLOR_HIDE) ||
+		    /* if onion and ghost flag do not draw*/
+		    (onion && (palcolor->flag & PC_COLOR_ONIONSKIN)))
+		{
+			continue;
+		}
+
+		/* calculate thickness */
+		sthickness = gps->thickness + lthick;
+
 		/* check which stroke-drawer to use */
 		if (dflag & GP_DRAWDATA_ONLY3D) {
 			const int no_xray = (dflag & GP_DRAWDATA_NO_XRAY);
 			int mask_orig = 0;
-			
+
 			if (no_xray) {
 				glGetIntegerv(GL_DEPTH_WRITEMASK, &mask_orig);
 				glDepthMask(0);
 				glEnable(GL_DEPTH_TEST);
-				
+
 				/* first arg is normally rv3d->dist, but this isn't
 				 * available here and seems to work quite well without */
 				bglPolygonOffset(1.0f, 1.0f);
@@ -846,34 +954,65 @@ static void gp_draw_strokes(bGPDframe *gpf, int offsx, int offsy, int winx, int
 				glPolygonOffset(-1.0f, -1.0f);
 #endif
 			}
-			
+
 			/* 3D Fill */
-			if ((dflag & GP_DRAWDATA_FILL) && (gps->totpoints >= 3)) {
-				glColor4fv(fill_color);
-				gp_draw_stroke_fill(gps, lthick, dflag, offsx, offsy, winx, winy);
+			//if ((dflag & GP_DRAWDATA_FILL) && (gps->totpoints >= 3)) {
+			if (gps->totpoints >= 3) {
+				/* set color using palette, tint color and opacity */
+				interp_v3_v3v3(tfill, palcolor->fill, tintcolor, tintcolor[3]);
+				tfill[3] = palcolor->fill[3] * opacity;
+				if (tfill[3] > GPENCIL_ALPHA_OPACITY_THRESH) {
+					if (!onion) {
+						glColor4fv(tfill);
+					}
+					else {
+						if (custonion) {
+							glColor4fv(tintcolor);
+						}
+						else {
+							ARRAY_SET_ITEMS(tfill, UNPACK3(palcolor->fill), tintcolor[3]);
+							glColor4fv(tfill);
+						}
+					}
+					gp_draw_stroke_fill(gpd, gps, offsx, offsy, winx, winy, diff_mat);
+				}
 			}
-			
+
 			/* 3D Stroke */
-			glColor4fv(color);
-			
-			if (dflag & GP_DRAWDATA_VOLUMETRIC) {
+			/* set color using palette, tint color and opacity */
+			if (!onion) {
+				interp_v3_v3v3(tcolor, palcolor->color, tintcolor, tintcolor[3]);
+				tcolor[3] = palcolor->color[3] * opacity;
+				copy_v4_v4(ink, tcolor);
+			}
+			else {
+				if (custonion) {
+					copy_v4_v4(ink, tintcolor);
+				}
+				else {
+					ARRAY_SET_ITEMS(tcolor, palcolor->color[0], palcolor->color[1], palcolor->color[2], opacity);
+					copy_v4_v4(ink, tcolor);
+				}
+			}
+			if (palcolor->flag & PC_COLOR_VOLUMETRIC) {
 				/* volumetric stroke drawing */
-				gp_draw_stroke_volumetric_3d(gps->points, gps->totpoints, lthick, dflag, gps->flag);
+				gp_draw_stroke_volumetric_3d(gps->points, gps->totpoints, sthickness, dflag, gps->flag, diff_mat, ink);
 			}
 			else {
 				/* 3D Lines - OpenGL primitives-based */
 				if (gps->totpoints == 1) {
-					gp_draw_stroke_point(gps->points, lthick, dflag, gps->flag, offsx, offsy, winx, winy);
+					gp_draw_stroke_point(gps->points, sthickness, dflag, gps->flag, offsx, offsy, winx, winy,
+					                     diff_mat, ink);
 				}
 				else {
-					gp_draw_stroke_3d(gps->points, gps->totpoints, lthick, debug, gps->flag);
+					gp_draw_stroke_3d(gps->points, gps->totpoints, sthickness, debug, gps->flag,
+					                  diff_mat, ink, gps->flag & GP_STROKE_CYCLIC);
 				}
 			}
-			
 			if (no_xray) {
 				glDepthMask(mask_orig);
 				glDisable(GL_DEPTH_TEST);
-				
+
 				bglPolygonOffset(0.0, 0.0);
 #if 0
 				glDisable(GL_POLYGON_OFFSET_LINE);
@@ -883,25 +1022,58 @@ static void gp_draw_strokes(bGPDframe *gpf, int offsx, int offsy, int winx, int
 		}
 		else {
 			/* 2D - Fill */
-			if ((dflag & GP_DRAWDATA_FILL) && (gps->totpoints >= 3)) {
-				glColor4fv(fill_color);
-				gp_draw_stroke_fill(gps, lthick, dflag, offsx, offsy, winx, winy);
+			if (gps->totpoints >= 3) {
+				/* set color using palette, tint color and opacity */
+				interp_v3_v3v3(tfill, palcolor->fill, tintcolor, tintcolor[3]);
+				tfill[3] = palcolor->fill[3] * opacity;
+				if (tfill[3] > GPENCIL_ALPHA_OPACITY_THRESH) {
+					if (!onion) {
+						glColor4fv(tfill);
+					}
+					else {
+						if (custonion) {
+							glColor4fv(tintcolor);
+						}
+						else {
+							ARRAY_SET_ITEMS(tfill, palcolor->fill[0], palcolor->fill[1], palcolor->fill[2],
+							                tintcolor[3]);
+							glColor4fv(tfill);
+						}
+					}
+					gp_draw_stroke_fill(gpd, gps, offsx, offsy, winx, winy, diff_mat);
+				}
 			}
-			
+
 			/* 2D Strokes... */
-			glColor4fv(color);
-			
-			if (dflag & GP_DRAWDATA_VOLUMETRIC) {
+			/* set color using palette, tint color and opacity */
+			if (!onion) {
+				interp_v3_v3v3(tcolor, palcolor->color, tintcolor, tintcolor[3]);
+				tcolor[3] = palcolor->color[3] * opacity;
+				copy_v4_v4(ink, tcolor);
+			}
+			else {
+				if (custonion) {
+					copy_v4_v4(ink, tintcolor);
+				}
+				else {
+					ARRAY_SET_ITEMS(tcolor, palcolor->color[0], palcolor->color[1], palcolor->color[2], opacity);
+					copy_v4_v4(ink, tcolor);
+				}
+			}
+			if (palcolor->flag & PC_COLOR_VOLUMETRIC) {
 				/* blob/disk-based "volumetric" drawing */
-				gp_draw_stroke_volumetric_2d(gps->points, gps->totpoints, lthick, dflag, gps->flag, offsx, offsy, winx, winy);
+				gp_draw_stroke_volumetric_2d(gps->points, gps->totpoints, sthickness, dflag, gps->flag,
+				                             offsx, offsy, winx, winy, diff_mat, ink);
 			}
 			else {
 				/* normal 2D strokes */
 				if (gps->totpoints == 1) {
-					gp_draw_stroke_point(gps->points, lthick, dflag, gps->flag, offsx, offsy, winx, winy);
+					gp_draw_stroke_point(gps->points, sthickness, dflag, gps->flag, offsx, offsy, winx, winy,
+					                     diff_mat, ink);
 				}
 				else {
-					gp_draw_stroke_2d(gps->points, gps->totpoints, lthick, dflag, gps->flag, debug, offsx, offsy, winx, winy);
+					gp_draw_stroke_2d(gps->points, gps->totpoints, sthickness, dflag, gps->flag, debug,
+					                  offsx, offsy, winx, winy, diff_mat, ink);
 				}
 			}
 		}
@@ -909,13 +1081,19 @@ static void gp_draw_strokes(bGPDframe *gpf, int offsx, int offsy, int winx, int
 }
 
 /* Draw selected verts for strokes being edited */
-static void gp_draw_strokes_edit(bGPDframe *gpf, int offsx, int offsy, int winx, int winy, short dflag, const float tcolor[3])
+static void gp_draw_strokes_edit(
+        bGPdata *gpd, bGPDframe *gpf, int offsx, int offsy, int winx, int winy, short dflag,
+        short lflag, float diff_mat[4][4], float alpha)
 {
 	bGPDstroke *gps;
 	
+	/* if alpha 0 do not draw */
+	if (alpha == 0.0f)
+		return;
+
 	const bool no_xray = (dflag & GP_DRAWDATA_NO_XRAY) != 0;
 	int mask_orig = 0;
-	
+
 	/* set up depth masks... */
 	if (dflag & GP_DRAWDATA_ONLY3D) {
 		if (no_xray) {
@@ -939,7 +1117,8 @@ static void gp_draw_strokes_edit(bGPDframe *gpf, int offsx, int offsy, int winx,
 		bGPDspoint *pt;
 		float vsize, bsize;
 		int i;
-		
+		float fpt[3];
+
 		/* check if stroke can be drawn */
 		if (gp_can_draw_stroke(gps, dflag) == false)
 			continue;
@@ -951,6 +1130,19 @@ static void gp_draw_strokes_edit(bGPDframe *gpf, int offsx, int offsy, int winx,
 		if ((gps->flag & GP_STROKE_SELECT) == 0)
 			continue;
 		
+		/* verify palette color lock */
+		{
+			bGPDpalettecolor *palcolor = ED_gpencil_stroke_getcolor(gpd, gps);
+			if (palcolor != NULL) {
+				if (palcolor->flag & PC_COLOR_HIDE) {
+					continue;
+				}
+				if (((lflag & GP_LAYER_UNLOCK_COLOR) == 0) && (palcolor->flag & PC_COLOR_LOCKED)) {
+					continue;
+				}
+			}
+		}
+
 		/* Get size of verts:
 		 * - The selected state needs to be larger than the unselected state so that
 		 *   they stand out more.
@@ -966,25 +1158,23 @@ static void gp_draw_strokes_edit(bGPDframe *gpf, int offsx, int offsy, int winx,
 		}
 		
 		/* First Pass: Draw all the verts (i.e. these become the unselected state) */
-		if (tcolor != NULL) {
-			/* for now, we assume that the base color of the points is not too close to the real color */
-			glColor3fv(tcolor);
-		}
-		else {
-			/* this doesn't work well with the default theme and black strokes... */
-			UI_ThemeColor(TH_GP_VERTEX);
-		}
+		/* for now, we assume that the base color of the points is not too close to the real color */
+		/* set color using palette */
+		bGPDpalettecolor *palcolor = ED_gpencil_stroke_getcolor(gpd, gps);
+		glColor3fv(palcolor->color);
+
 		glPointSize(bsize);
 		
 		glBegin(GL_POINTS);
 		for (i = 0, pt = gps->points; i < gps->totpoints && pt; i++, pt++) {
 			if (gps->flag & GP_STROKE_3DSPACE) {
-				glVertex3fv(&pt->x);
+				mul_v3_m4v3(fpt, diff_mat, &pt->x);
+				glVertex3fv(fpt);
 			}
 			else {
 				float co[2];
-				
-				gp_calc_2d_stroke_xy(pt, gps->flag, offsx, offsy, winx, winy, co);
+				mul_v3_m4v3(fpt, diff_mat, &pt->x);
+				gp_calc_2d_stroke_fxy(fpt, gps->flag, offsx, offsy, winx, winy, co);
 				glVertex2fv(co);
 			}
 		}
@@ -992,24 +1182,54 @@ static void gp_draw_strokes_edit(bGPDframe *gpf, int offsx, int offsy, int winx,
 		
 		
 		/* Second Pass: Draw only verts which are selected */
-		UI_ThemeColor(TH_GP_VERTEX_SELECT);
+		float curColor[4];
+		UI_GetThemeColor3fv(TH_GP_VERTEX_SELECT, curColor);
+		glColor4f(curColor[0], curColor[1], curColor[2], alpha);
+
 		glPointSize(vsize);
 		
 		glBegin(GL_POINTS);
 		for (i = 0, pt = gps->points; i < gps->totpoints && pt; i++, pt++) {
 			if (pt->flag & GP_SPOINT_SELECT) {
 				if (gps->flag & GP_STROKE_3DSPACE) {
-					glVertex3fv(&pt->x);
+					mul_v3_m4v3(fpt, diff_mat, &pt->x);
+					glVertex3fv(fpt);
 				}
 				else {
 					float co[2];
 					
-					gp_calc_2d_stroke_xy(pt, gps->flag, offsx, offsy, winx, winy, co);
+					mul_v3_m4v3(fpt, diff_mat, &pt->x);
+					gp_calc_2d_stroke_fxy(fpt, gps->flag, offsx, offsy, winx, winy, co);
 					glVertex2fv(co);
 				}
 			}
 		}
 		glEnd();
+
+		/* Draw start and end point if enabled stroke direction hint */
+		if ((gpd->flag & GP_DATA_SHOW_DIRECTION) && (gps->totpoints > 1)) {
+			bGPDspoint *p;
+			
+			glPointSize(vsize + 4);
+			glBegin(GL_POINTS);
+
+			/* start point in green bigger */
+			glColor3f(0.0f, 1.0f, 0.0f);
+			p = &gps->points[0];
+			mul_v3_m4v3(fpt, diff_mat, &p->x);
+			glVertex3fv(fpt);
+			glEnd();
+
+			/* end point in red smaller */
+			glPointSize(vsize + 1);
+			glBegin(GL_POINTS);
+
+			glColor3f(1.0f, 0.0f, 0.0f);
+			p = &gps->points[gps->totpoints - 1];
+			mul_v3_m4v3(fpt, diff_mat, &p->x);
+			glVertex3fv(fpt);
+			glEnd();
+		}
 	}
 	
 	
@@ -1031,18 +1251,20 @@ static void gp_draw_strokes_edit(bGPDframe *gpf, int offsx, int offsy, int winx,
 /* ----- General Drawing ------ */
 
 /* draw onion-skinning for a layer */
-static void gp_draw_onionskins(bGPDlayer *gpl, bGPDframe *gpf, int offsx, int offsy, int winx, int winy,
-                               int UNUSED(cfra), int dflag, bool debug, short lthick)
+static void gp_draw_onionskins(
+        bGPdata *gpd, bGPDlayer *gpl, bGPDframe *gpf, int offsx, int offsy, int winx, int winy,
+        int UNUSED(cfra), int dflag, bool debug, float diff_mat[4][4])
 {
-	const float alpha = gpl->color[3];
+	const float default_color[3] = {UNPACK3(U.gpencil_new_layer_col)};
+	const float alpha = 1.0f;
 	float color[4];
-	
+
 	/* 1) Draw Previous Frames First */
 	if (gpl->flag & GP_LAYER_GHOST_PREVCOL) {
 		copy_v3_v3(color, gpl->gcolor_prev);
 	}
 	else {
-		copy_v3_v3(color, gpl->color);
+		copy_v3_v3(color, default_color);
 	}
 	
 	if (gpl->gstep > 0) {
@@ -1056,7 +1278,8 @@ static void gp_draw_onionskins(bGPDlayer *gpl, bGPDframe *gpf, int offsx, int of
 				/* alpha decreases with distance from curframe index */
 				fac = 1.0f - ((float)(gpf->framenum - gf->framenum) / (float)(gpl->gstep + 1));
 				color[3] = alpha * fac * 0.66f;
-				gp_draw_strokes(gf, offsx, offsy, winx, winy, dflag, debug, lthick, color, color);
+				gp_draw_strokes(gpd, gf, offsx, offsy, winx, winy, dflag, debug, gpl->thickness, 1.0f, color,
+				                true, gpl->flag & GP_LAYER_GHOST_PREVCOL, diff_mat);
 			}
 			else
 				break;
@@ -1066,7 +1289,8 @@ static void gp_draw_onionskins(bGPDlayer *gpl, bGPDframe *gpf, int offsx, int of
 		/* draw the strokes for the ghost frames (at half of the alpha set by user) */
 		if (gpf->prev) {
 			color[3] = (alpha / 7);
-			gp_draw_strokes(gpf->prev, offsx, offsy, winx, winy, dflag, debug, lthick, color, color);
+			gp_draw_strokes(gpd, gpf->prev, offsx, offsy, winx, winy, dflag, debug, gpl->thickness, 1.0f, color,
+			                true, gpl->flag & GP_LAYER_GHOST_PREVCOL, diff_mat);
 		}
 	}
 	else {
@@ -1079,7 +1303,7 @@ static void gp_draw_onionskins(bGPDlayer *gpl, bGPDframe *gpf, int offsx, int of
 		copy_v3_v3(color, gpl->gcolor_next);
 	}
 	else {
-		copy_v3_v3(color, gpl->color);
+		copy_v3_v3(color, default_color);
 	}
 	
 	if (gpl->gstep_next > 0) {
@@ -1093,7 +1317,8 @@ static void gp_draw_onionskins(bGPDlayer *gpl, bGPDframe *gpf, int offsx, int of
 				/* alpha decreases with distance from curframe index */
 				fac = 1.0f - ((float)(gf->framenum - gpf->framenum) / (float)(gpl->gstep_next + 1));
 				color[3] = alpha * fac * 0.66f;
-				gp_draw_strokes(gf, offsx, offsy, winx, winy, dflag, debug, lthick, color, color);
+				gp_draw_strokes(gpd, gf, offsx, offsy, winx, winy, dflag, debug, gpl->thickness, 1.0f, color,
+				                true, gpl->flag & GP_LAYER_GHOST_NEXTCOL, diff_mat);
 			}
 			else
 				break;
@@ -1103,27 +1328,31 @@ static void gp_draw_onionskins(bGPDlayer *gpl, bGPDframe *gpf, int offsx, int of
 		/* draw the strokes for the ghost frames (at half of the alpha set by user) */
 		if (gpf->next) {
 			color[3] = (alpha / 4);
-			gp_draw_strokes(gpf->next, offsx, offsy, winx, winy, dflag, debug, lthick, color, color);
+			gp_draw_strokes(gpd, gpf->next, offsx, offsy, winx, winy, dflag, debug, gpl->thickness, 1.0f, color,
+			                true, gpl->flag & GP_LAYER_GHOST_NEXTCOL, diff_mat);
 		}
 	}
 	else {
 		/* don't draw - disabled */
 	}
 	
-	/* 3) restore alpha */
-	glColor4fv(gpl->color);
 }
 
 /* loop over gpencil data layers, drawing them */
-static void gp_draw_data_layers(bGPdata *gpd, int offsx, int offsy, int winx, int winy, int cfra, int dflag)
+static void gp_draw_data_layers(
+        bGPDbrush *brush, float alpha, bGPdata *gpd,
+        int offsx, int offsy, int winx, int winy, int cfra, int dflag)
 {
 	bGPDlayer *gpl;
-	
+	float diff_mat[4][4];
+
 	for (gpl = gpd->layers.first; gpl; gpl = gpl->next) {
 		bGPDframe *gpf;
-		
+		/* calculate parent position */
+		ED_gpencil_parent_location(gpl, diff_mat);
+
 		bool debug = (gpl->flag & GP_LAYER_DRAWDEBUG) ? true : false;
-		short lthick = gpl->thickness;
+		short lthick = brush->thickness + gpl->thickness;
 		
 		/* don't draw layer if hidden */
 		if (gpl->flag & GP_LAYER_HIDE)
@@ -1155,9 +1384,6 @@ static void gp_draw_data_layers(bGPdata *gpd, int offsx, int offsy, int winx, in
 		/* HQ fills... */
 		GP_DRAWFLAG_APPLY((gpl->flag & GP_LAYER_HQ_FILL), GP_DRAWDATA_HQ_FILL);
 
-		/* fill strokes... */
-		// XXX: this is not a very good limit
-		GP_DRAWFLAG_APPLY((gpl->fill[3] > GPENCIL_ALPHA_OPACITY_THRESH), GP_DRAWDATA_FILL);
 #undef GP_DRAWFLAG_APPLY
 		
 		/* draw 'onionskins' (frame left + right) */
@@ -1165,11 +1391,12 @@ static void gp_draw_data_layers(bGPdata *gpd, int offsx, int offsy, int winx, in
 			/* Drawing method - only immediately surrounding (gstep = 0),
 			 * or within a frame range on either side (gstep > 0)
 			 */
-			gp_draw_onionskins(gpl, gpf, offsx, offsy, winx, winy, cfra, dflag, debug, lthick);
+			gp_draw_onionskins(gpd, gpl, gpf, offsx, offsy, winx, winy, cfra, dflag, debug, diff_mat);
 		}
 		
 		/* draw the strokes already in active frame */
-		gp_draw_strokes(gpf, offsx, offsy, winx, winy, dflag, debug, lthick, gpl->color, gpl->fill);
+		gp_draw_strokes(gpd, gpf, offsx, offsy, winx, winy, dflag, debug, gpl->thickness,
+		                gpl->opacity, gpl->tintcolor, false, false, diff_mat);
 		
 		/* Draw verts of selected strokes
 		 *  - when doing OpenGL renders, we don't want to be showing these, as that ends up flickering
@@ -1183,8 +1410,7 @@ static void gp_draw_data_layers(bGPdata *gpd, int offsx, int offsy, int winx, in
 		    (gpl->flag & GP_LAYER_LOCKED) == 0 &&
 		    (gpd->flag & GP_DATA_STROKE_EDITMODE))
 		{
-			gp_draw_strokes_edit(gpf, offsx, offsy, winx, winy, dflag,
-			                     (gpl->color[3] < 0.95f) ? gpl->color : NULL);
+			gp_draw_strokes_edit(gpd, gpf, offsx, offsy, winx, winy, dflag, gpl->flag, diff_mat, alpha);
 		}
 		
 		/* Check if may need to draw the active stroke cache, only if this layer is the active layer
@@ -1194,7 +1420,7 @@ static void gp_draw_data_layers(bGPdata *gpd, int offsx, int offsy, int winx, in
 		    (gpf->flag & GP_FRAME_PAINT))
 		{
 			/* Set color for drawing buffer stroke - since this may not be set yet */
-			glColor4fv(gpl->color);
+			// glColor4fv(gpl->color);
 			
 			/* Buffer stroke needs to be drawn with a different linestyle
 			 * to help differentiate them from normal strokes.
@@ -1202,11 +1428,12 @@ static void gp_draw_data_layers(bGPdata *gpd, int offsx, int offsy, int winx, in
 			 * It should also be noted that sbuffer contains temporary point types
 			 * i.e. tGPspoints NOT bGPDspoints
 			 */
-			if (gpl->flag & GP_LAYER_VOLUMETRIC) {
-				gp_draw_stroke_volumetric_buffer(gpd->sbuffer, gpd->sbuffer_size, lthick, dflag, gpd->sbuffer_sflag);
+			if (gpd->sflag & PC_COLOR_VOLUMETRIC) {
+				gp_draw_stroke_volumetric_buffer(gpd->sbuffer, gpd->sbuffer_size, lthick,
+				                                 dflag, gpd->sbuffer_sflag, gpd->scolor);
 			}
 			else {
-				gp_draw_stroke_buffer(gpd->sbuffer, gpd->sbuffer_size, lthick, dflag, gpd->sbuffer_sflag);
+				gp_draw_stroke_buffer(gpd->sbuffer, gpd->sbuffer_size, lthick, dflag, gpd->sbuffer_sflag, gpd->scolor);
 			}
 		}
 	}
@@ -1258,7 +1485,9 @@ static void gp_draw_status_text(bGPdata *gpd, ARegion *ar)
 }
 
 /* draw grease-pencil datablock */
-static void gp_draw_data(bGPdata *gpd, int offsx, int offsy, int winx, int winy, int cfra, int dflag)
+static void gp_draw_data(
+        bGPDbrush *brush, float alpha, bGPdata *gpd,
+        int offsx, int offsy, int winx, int winy, int cfra, int dflag)
 {
 	/* reset line drawing style (in case previous user didn't reset) */
 	setlinestyle(0);
@@ -1276,7 +1505,7 @@ static void gp_draw_data(bGPdata *gpd, int offsx, int offsy, int winx, int winy,
 	glEnable(GL_BLEND);
 	
 	/* draw! */
-	gp_draw_data_layers(gpd, offsx, offsy, winx, winy, cfra, dflag);
+	gp_draw_data_layers(brush, alpha, gpd, offsx, offsy, winx, winy, cfra, dflag);
 	
 	/* turn off alpha blending, then smooth lines */
 	glDisable(GL_BLEND); // alpha blending
@@ -1303,14 +1532,25 @@ static void gp_draw_data_all(Scene *scene, bGPdata *gpd, int offsx, int offsy, i
 		}
 		
 		if (gpd_source) {
-			gp_draw_data(gpd_source, offsx, offsy, winx, winy, cfra, dflag);
+			ToolSettings *ts = scene->toolsettings;
+			bGPDbrush *brush = gpencil_brush_getactive(ts);
+			if (brush != NULL) {
+				gp_draw_data(brush, ts->gp_sculpt.alpha, gpd_source,
+				             offsx, offsy, winx, winy, cfra, dflag);
+			}
+			
 		}
 	}
 	
 	/* scene/clip data has already been drawn, only object/track data is drawn here
 	 * if gpd_source == gpd, we don't have any object/track data and we can skip */
 	if (gpd_source == NULL || (gpd_source && gpd_source != gpd)) {
-		gp_draw_data(gpd, offsx, offsy, winx, winy, cfra, dflag);
+		ToolSettings *ts = scene->toolsettings;
+		bGPDbrush *brush = gpencil_brush_getactive(ts);
+		if (brush != NULL) {
+			gp_draw_data(brush, ts->gp_sculpt.alpha, gpd,
+			             offsx, offsy, winx, winy, cfra, dflag);
+		}
 	}
 }
 
@@ -1479,6 +1719,7 @@ void ED_gpencil_draw_view3d(wmWindowManager *wm, Scene *scene, View3D *v3d, AReg
 	
 	/* draw it! */
 	gp_draw_data_all(scene, gpd, offsx, offsy, winx, winy, CFRA, dflag, v3d->spacetype);
+	
 }
 
 void ED_gpencil_draw_ex(Scene *scene, bGPdata *gpd, int winx, int winy, const int cfra, const char spacetype)
diff --git a/source/blender/editors/gpencil/gpencil_brush.c b/source/blender/editors/gpencil/gpencil_brush.c
index 0271afd6827..1bb3b7e1ae7 100644
--- a/source/blender/editors/gpencil/gpencil_brush.c
+++ b/source/blender/editors/gpencil/gpencil_brush.c
@@ -18,7 +18,7 @@
  * The Original Code is Copyright (C) 2015, Blender Foundation
  * This is a new part of Blender
  *
- * Contributor(s): Joshua Leung
+ * Contributor(s): Joshua Leung, Antonio Vazquez
  *
  * ***** END GPL LICENSE BLOCK *****
  *
@@ -51,6 +51,7 @@
 #include "DNA_space_types.h"
 #include "DNA_view3d_types.h"
 #include "DNA_gpencil_types.h"
+#include "DNA_object_types.h"
 
 #include "BKE_context.h"
 #include "BKE_global.h"
@@ -223,9 +224,26 @@ static bool gp_brush_smooth_apply(tGP_BrushEditData *gso, bGPDstroke *gps, int i
 	GP_EditBrush_Data *brush = gso->brush;
 	float inf = gp_brush_influence_calc(gso, radius, co);
 	bool affect_pressure = (brush->flag & GP_EDITBRUSH_FLAG_SMOOTH_PRESSURE) != 0;
-	
+	/* need one flag enabled by default */
+	if ((gso->settings->flag & (GP_BRUSHEDIT_FLAG_APPLY_POSITION |
+	                            GP_BRUSHEDIT_FLAG_APPLY_STRENGTH |
+	                            GP_BRUSHEDIT_FLAG_APPLY_THICKNESS)) == 0)
+	{
+		gso->settings->flag |= GP_BRUSHEDIT_FLAG_APPLY_POSITION;
+	}
+
 	/* perform smoothing */
-	return gp_smooth_stroke(gps, i, inf, affect_pressure);
+	if (gso->settings->flag & GP_BRUSHEDIT_FLAG_APPLY_POSITION) {
+		gp_smooth_stroke(gps, i, inf, affect_pressure);
+	}
+	if (gso->settings->flag & GP_BRUSHEDIT_FLAG_APPLY_STRENGTH) {
+		gp_smooth_stroke_strength(gps, i, inf);
+	}
+	if (gso->settings->flag & GP_BRUSHEDIT_FLAG_APPLY_THICKNESS) {
+		gp_smooth_stroke_thickness(gps, i, inf);
+	}
+	
+	return true;
 }
 
 /* ----------------------------------------------- */
@@ -268,6 +286,41 @@ static bool gp_brush_thickness_apply(tGP_BrushEditData *gso, bGPDstroke *gps, in
 
 
 /* ----------------------------------------------- */
+/* Color Strength Brush */
+
+/* Make color more or less transparent by the specified amounts */
+static bool gp_brush_strength_apply(
+        tGP_BrushEditData *gso, bGPDstroke *gps, int i,
+        const int radius, const int co[2])
+{
+	bGPDspoint *pt = gps->points + i;
+	float inf;
+
+	/* Compute strength of effect
+	* - We divide the strength by 10, so that users can set "sane" values.
+	*   Otherwise, good default values are in the range of 0.093
+	*/
+	inf = gp_brush_influence_calc(gso, radius, co) / 10.0f;
+
+	/* apply */
+	// XXX: this is much too strong, and it should probably do some smoothing with the surrounding stuff
+	if (gp_brush_invert_check(gso)) {
+		/* make line thinner - reduce stroke pressure */
+		pt->strength -= inf;
+	}
+	else {
+		/* make line thicker - increase stroke pressure */
+		pt->strength += inf;
+	}
+
+	/* Strength should stay within [0.0, 1.0] */
+	CLAMP(pt->strength, 0.0f, 1.0f);
+
+	return true;
+}
+
+
+/* ----------------------------------------------- */
 /* Grab Brush */
 
 /* Custom data per stroke for the Grab Brush
@@ -373,11 +426,12 @@ static void gp_brush_grab_calc_dvec(tGP_BrushEditData *gso)
 }
 
 /* Apply grab transform to all relevant points of the affected strokes */
-static void gp_brush_grab_apply_cached(tGP_BrushEditData *gso, bGPDstroke *gps)
+static void gp_brush_grab_apply_cached(
+        tGP_BrushEditData *gso, bGPDstroke *gps, bool parented, float diff_mat[4][4])
 {
 	tGPSB_Grab_StrokeData *data = BLI_ghash_lookup(gso->stroke_customdata, gps);
 	int i;
-	
+
 	/* Apply dvec to all of the stored points */
 	for (i = 0; i < data->size; i++) {
 		bGPDspoint *pt = &gps->points[data->points[i]];
@@ -385,9 +439,23 @@ static void gp_brush_grab_apply_cached(tGP_BrushEditData *gso, bGPDstroke *gps)
 		
 		/* adjust the amount of displacement to apply */
 		mul_v3_v3fl(delta, gso->dvec, data->weights[i]);
+		if (!parented) {
+			/* apply */
+			add_v3_v3(&pt->x, delta);
+		}
+		else {
+			float fpt[3];
+			/* apply transformation */
+			mul_v3_m4v3(fpt, diff_mat, &pt->x);
+			/* apply */
+			add_v3_v3(fpt, delta);
+			copy_v3_v3(&pt->x, fpt);
+			/* undo transformation to the init parent position */
+			float inverse_diff_mat[4][4];
+			invert_m4_m4(inverse_diff_mat, diff_mat);
+			mul_m4_v3(inverse_diff_mat, &pt->x);
+		}
 		
-		/* apply */
-		add_v3_v3(&pt->x, delta);
 	}
 }
 
@@ -592,62 +660,92 @@ static bool gp_brush_randomize_apply(tGP_BrushEditData *gso, bGPDstroke *gps, in
 	 */
 	const float inf = gp_brush_influence_calc(gso, radius, co) / 2.0f;
 	const float fac = BLI_frand() * inf;
-	
-	/* Jitter is applied perpendicular to the mouse movement vector
-	 * - We compute all effects in screenspace (since it's easier)
-	 *   and then project these to get the points/distances in
-	 *   viewspace as needed
-	 */
-	float mvec[2], svec[2];
-	
-	/* mouse movement in ints -> floats */
-	mvec[0] = (float)(gso->mval[0] - gso->mval_prev[0]);
-	mvec[1] = (float)(gso->mval[1] - gso->mval_prev[1]);
-	
-	/* rotate mvec by 90 degrees... */
-	svec[0] = -mvec[1];
-	svec[1] =  mvec[0];
-	
-	//printf("svec = %f %f, ", svec[0], svec[1]);
-	
-	/* scale the displacement by the random displacement, and apply */
-	if (BLI_frand() > 0.5f) {
-		mul_v2_fl(svec, -fac);
-	}
-	else {
-		mul_v2_fl(svec, fac);
+	/* need one flag enabled by default */
+	if ((gso->settings->flag & (GP_BRUSHEDIT_FLAG_APPLY_POSITION |
+	                            GP_BRUSHEDIT_FLAG_APPLY_STRENGTH |
+	                            GP_BRUSHEDIT_FLAG_APPLY_THICKNESS)) == 0)
+	{
+		gso->settings->flag |= GP_BRUSHEDIT_FLAG_APPLY_POSITION;
 	}
-	
-	//printf("%f %f (%f), nco = {%f %f}, co = %d %d\n", svec[0], svec[1], fac, nco[0], nco[1], co[0], co[1]);
-	
-	/* convert to dataspace */
-	if (gps->flag & GP_STROKE_3DSPACE) {
-		/* 3D: Project to 3D space */
-		if (gso->sa->spacetype == SPACE_VIEW3D) {
-			bool flip;
-			RegionView3D *rv3d = gso->ar->regiondata;
-			float zfac = ED_view3d_calc_zfac(rv3d, &pt->x, &flip);
-			if (flip == false) {
-				float dvec[3];
-				ED_view3d_win_to_delta(gso->gsc.ar, svec, dvec, zfac);
-				add_v3_v3(&pt->x, dvec);
+
+	/* apply random to position */
+	if (gso->settings->flag & GP_BRUSHEDIT_FLAG_APPLY_POSITION) {
+		/* Jitter is applied perpendicular to the mouse movement vector
+		 * - We compute all effects in screenspace (since it's easier)
+		 *   and then project these to get the points/distances in
+		 *   viewspace as needed
+		 */
+		float mvec[2], svec[2];
+
+		/* mouse movement in ints -> floats */
+		mvec[0] = (float)(gso->mval[0] - gso->mval_prev[0]);
+		mvec[1] = (float)(gso->mval[1] - gso->mval_prev[1]);
+
+		/* rotate mvec by 90 degrees... */
+		svec[0] = -mvec[1];
+		svec[1] =  mvec[0];
+
+		/* scale the displacement by the random displacement, and apply */
+		if (BLI_frand() > 0.5f) {
+			mul_v2_fl(svec, -fac);
+		}
+		else {
+			mul_v2_fl(svec, fac);
+		}
+
+		//printf("%f %f (%f), nco = {%f %f}, co = %d %d\n", svec[0], svec[1], fac, nco[0], nco[1], co[0], co[1]);
+
+		/* convert to dataspace */
+		if (gps->flag & GP_STROKE_3DSPACE) {
+			/* 3D: Project to 3D space */
+			if (gso->sa->spacetype == SPACE_VIEW3D) {
+				bool flip;
+				RegionView3D *rv3d = gso->ar->regiondata;
+				float zfac = ED_view3d_calc_zfac(rv3d, &pt->x, &flip);
+				if (flip == false) {
+					float dvec[3];
+					ED_view3d_win_to_delta(gso->gsc.ar, svec, dvec, zfac);
+					add_v3_v3(&pt->x, dvec);
+				}
+			}
+			else {
+				/* ERROR */
+				BLI_assert("3D stroke being sculpted in non-3D view");
 			}
 		}
 		else {
-			/* ERROR */
-			BLI_assert("3D stroke being sculpted in non-3D view");
+			/* 2D: As-is */
+			// XXX: v2d scaling/offset?
+			float nco[2];
+			nco[0] = (float)co[0] + svec[0];
+			nco[1] = (float)co[1] + svec[1];
+
+			copy_v2_v2(&pt->x, nco);
 		}
 	}
-	else {
-		/* 2D: As-is */
-		// XXX: v2d scaling/offset?
-		float nco[2];
-		nco[0] = (float)co[0] + svec[0];
-		nco[1] = (float)co[1] + svec[1];
-
-		copy_v2_v2(&pt->x, nco);
+	/* apply random to strength */
+	if (gso->settings->flag & GP_BRUSHEDIT_FLAG_APPLY_STRENGTH) {
+		if (BLI_frand() > 0.5f) {
+			pt->strength += fac;
+		}
+		else {
+			pt->strength -= fac;
+		}
+		CLAMP_MIN(pt->strength, 0.0f);
+		CLAMP_MAX(pt->strength, 1.0f);
 	}
-	
+	/* apply random to thickness (use pressure) */
+	if (gso->settings->flag & GP_BRUSHEDIT_FLAG_APPLY_THICKNESS) {
+		if (BLI_frand() > 0.5f) {
+			pt->pressure += fac;
+		}
+		else {
+			pt->pressure -= fac;
+		}
+		/* only limit lower value */
+		CLAMP_MIN(pt->pressure, 0.0f);
+	}
+
 	/* done */
 	return true;
 }
@@ -1099,7 +1197,9 @@ static void gpsculpt_brush_init_stroke(tGP_BrushEditData *gso)
 /* Apply ----------------------------------------------- */
 
 /* Apply brush operation to points in this stroke */
-static bool gpsculpt_brush_do_stroke(tGP_BrushEditData *gso, bGPDstroke *gps, GP_BrushApplyCb apply)
+static bool gpsculpt_brush_do_stroke(
+        tGP_BrushEditData *gso, bGPDstroke *gps, bool parented,
+        float diff_mat[4][4], GP_BrushApplyCb apply)
 {
 	GP_SpaceConversion *gsc = &gso->gsc;
 	rcti *rect = &gso->brush_rect;
@@ -1111,9 +1211,16 @@ static bool gpsculpt_brush_do_stroke(tGP_BrushEditData *gso, bGPDstroke *gps, GP
 	int i;
 	bool include_last = false;
 	bool changed = false;
-	
+
 	if (gps->totpoints == 1) {
-		gp_point_to_xy(gsc, gps, gps->points, &pc1[0], &pc1[1]);
+		if (!parented) {
+			gp_point_to_xy(gsc, gps, gps->points, &pc1[0], &pc1[1]);
+		}
+		else {
+			bGPDspoint pt_temp;
+			gp_point_to_parent_space(gps->points, diff_mat, &pt_temp);
+			gp_point_to_xy(gsc, gps, &pt_temp, &pc1[0], &pc1[1]);
+		}
 		
 		/* do boundbox check first */
 		if ((!ELEM(V2D_IS_CLIPPED, pc1[0], pc1[1])) && BLI_rcti_isect_pt(rect, pc1[0], pc1[1])) {
@@ -1140,10 +1247,20 @@ static bool gpsculpt_brush_do_stroke(tGP_BrushEditData *gso, bGPDstroke *gps, GP
 					continue;
 				}
 			}
-			
-			gp_point_to_xy(gsc, gps, pt1, &pc1[0], &pc1[1]);
-			gp_point_to_xy(gsc, gps, pt2, &pc2[0], &pc2[1]);
-			
+			if (!parented) {
+				gp_point_to_xy(gsc, gps, pt1, &pc1[0], &pc1[1]);
+				gp_point_to_xy(gsc, gps, pt2, &pc2[0], &pc2[1]);
+			}
+			else {
+				bGPDspoint npt;
+				gp_point_to_parent_space(pt1, diff_mat, &npt);
+				gp_point_to_xy(gsc, gps, &npt, &pc1[0], &pc1[1]);
+
+				gp_point_to_parent_space(pt2, diff_mat, &npt);
+				gp_point_to_xy(gsc, gps, &npt, &pc2[0], &pc2[1]);
+			}
+
+
 			/* Check that point segment of the boundbox of the selection stroke */
 			if (((!ELEM(V2D_IS_CLIPPED, pc1[0], pc1[1])) && BLI_rcti_isect_pt(rect, pc1[0], pc1[1])) ||
 			    ((!ELEM(V2D_IS_CLIPPED, pc2[0], pc2[1])) && BLI_rcti_isect_pt(rect, pc2[0], pc2[1])))
@@ -1228,76 +1345,105 @@ static bool gpsculpt_brush_apply_standard(bContext *C, tGP_BrushEditData *gso)
 	
 	
 	/* Find visible strokes, and perform operations on those if hit */
-	CTX_DATA_BEGIN(C, bGPDstroke *, gps, editable_gpencil_strokes)
+	float diff_mat[4][4];
+	bool parented = false;
+
+	CTX_DATA_BEGIN(C, bGPDlayer *, gpl, editable_gpencil_layers)
 	{
-		switch (gso->brush_type) {
-			case GP_EDITBRUSH_TYPE_SMOOTH: /* Smooth strokes */
-			{
-				changed |= gpsculpt_brush_do_stroke(gso, gps, gp_brush_smooth_apply);
-				break;
-			}
-			
-			case GP_EDITBRUSH_TYPE_THICKNESS: /* Adjust stroke thickness */
-			{
-				changed |= gpsculpt_brush_do_stroke(gso, gps, gp_brush_thickness_apply);
-				break;
+		/* calculate difference matrix if parent object */
+		if (gpl->parent != NULL) {
+			ED_gpencil_parent_location(gpl, diff_mat);
+			parented = true;
+		}
+		else {
+			parented = false;
+		}
+
+		bGPDframe *gpf = gpl->actframe;
+		bGPDstroke *gps;
+		for (gps = gpf->strokes.first; gps; gps = gps->next) {
+			/* skip strokes that are invalid for current view */
+			if (ED_gpencil_stroke_can_use(C, gps) == false)
+				continue;
+			/* check if the color is editable */
+			if (ED_gpencil_stroke_color_use(gpl, gps) == false) {
+				continue;
 			}
-			
-			case GP_EDITBRUSH_TYPE_GRAB: /* Grab points */
-			{
-				if (gso->first) {
-					/* First time this brush stroke is being applied:
-					 * 1) Prepare data buffers (init/clear) for this stroke
-					 * 2) Use the points now under the cursor
-					 */
-					gp_brush_grab_stroke_init(gso, gps);
-					changed |= gpsculpt_brush_do_stroke(gso, gps, gp_brush_grab_store_points);
+
+			switch (gso->brush_type) {
+				case GP_EDITBRUSH_TYPE_SMOOTH: /* Smooth strokes */
+				{
+					changed |= gpsculpt_brush_do_stroke(gso, gps, parented, diff_mat, gp_brush_smooth_apply);
+					break;
 				}
-				else {
-					/* Apply effect to the stored points */
-					gp_brush_grab_apply_cached(gso, gps);
-					changed |= true;
+
+				case GP_EDITBRUSH_TYPE_THICKNESS: /* Adjust stroke thickness */
+				{
+					changed |= gpsculpt_brush_do_stroke(gso, gps, parented, diff_mat, gp_brush_thickness_apply);
+					break;
 				}
-				break;
-			}
-			
-			case GP_EDITBRUSH_TYPE_PUSH: /* Push points */
-			{
-				changed |= gpsculpt_brush_do_stroke(gso, gps, gp_brush_push_apply);
-				break;
-			}
-			
-			case GP_EDITBRUSH_TYPE_PINCH: /* Pinch points */
-			{
-				changed |= gpsculpt_brush_do_stroke(gso, gps, gp_brush_pinch_apply);
-				break;
-			}
-			
-			case GP_EDITBRUSH_TYPE_TWIST: /* Twist points around midpoint */
-			{
-				changed |= gpsculpt_brush_do_stroke(gso, gps, gp_brush_twist_apply);
-				break;
+
+				case GP_EDITBRUSH_TYPE_STRENGTH: /* Adjust stroke color strength */
+				{
+					changed |= gpsculpt_brush_do_stroke(gso, gps, parented, diff_mat, gp_brush_strength_apply);
+					break;
+				}
+
+				case GP_EDITBRUSH_TYPE_GRAB: /* Grab points */
+				{
+					if (gso->first) {
+						/* First time this brush stroke is being applied:
+						 * 1) Prepare data buffers (init/clear) for this stroke
+						 * 2) Use the points now under the cursor
+						 */
+						gp_brush_grab_stroke_init(gso, gps);
+						changed |= gpsculpt_brush_do_stroke(gso, gps, parented, diff_mat, gp_brush_grab_store_points);
+					}
+					else {
+						/* Apply effect to the stored points */
+						gp_brush_grab_apply_cached(gso, gps, parented, diff_mat);
+						changed |= true;
+					}
+					break;
+				}
+
+				case GP_EDITBRUSH_TYPE_PUSH: /* Push points */
+				{
+					changed |= gpsculpt_brush_do_stroke(gso, gps, parented, diff_mat, gp_brush_push_apply);
+					break;
+				}
+
+				case GP_EDITBRUSH_TYPE_PINCH: /* Pinch points */
+				{
+					changed |= gpsculpt_brush_do_stroke(gso, gps, parented, diff_mat, gp_brush_pinch_apply);
+					break;
+				}
+
+				case GP_EDITBRUSH_TYPE_TWIST: /* Twist points around midpoint */
+				{
+					changed |= gpsculpt_brush_do_stroke(gso, gps, parented, diff_mat, gp_brush_twist_apply);
+					break;
+				}
+
+				case GP_EDITBRUSH_TYPE_RANDOMIZE: /* Apply jitter */
+				{
+					changed |= gpsculpt_brush_do_stroke(gso, gps, parented, diff_mat, gp_brush_randomize_apply);
+					break;
+				}
+
+				default:
+					printf("ERROR: Unknown type of GPencil Sculpt brush - %u\n", gso->brush_type);
+					break;
 			}
-			
-			case GP_EDITBRUSH_TYPE_RANDOMIZE: /* Apply jitter */
-			{
-				changed |= gpsculpt_brush_do_stroke(gso, gps, gp_brush_randomize_apply);
-				break;
+			/* Triangulation must be calculated if changed */
+			if (changed) {
+				gps->flag |= GP_STROKE_RECALC_CACHES;
+				gps->tot_triangles = 0;
 			}
-			
-			default:
-				printf("ERROR: Unknown type of GPencil Sculpt brush - %u\n", gso->brush_type);
-				break;
-		}
-		
-		/* Triangulation must be calculated if changed */
-		if (changed) {
-			gps->flag |= GP_STROKE_RECALC_CACHES;
-			gps->tot_triangles = 0;
 		}
 	}
 	CTX_DATA_END;
-	
+
 	return changed;
 }
 
@@ -1441,6 +1587,11 @@ static int gpsculpt_brush_invoke(bContext *C, wmOperator *op, const wmEvent *eve
 			needs_timer = true;
 			break;
 			
+		case GP_EDITBRUSH_TYPE_STRENGTH:
+			brush_rate = 0.01f; // XXX: hardcoded
+			needs_timer = true;
+			break;
+
 		case GP_EDITBRUSH_TYPE_PINCH:
 			brush_rate = 0.001f; // XXX: hardcoded
 			needs_timer = true;
diff --git a/source/blender/editors/gpencil/gpencil_convert.c b/source/blender/editors/gpencil/gpencil_convert.c
index c47985ebc1b..95ea13c399a 100644
--- a/source/blender/editors/gpencil/gpencil_convert.c
+++ b/source/blender/editors/gpencil/gpencil_convert.c
@@ -142,12 +142,31 @@ static EnumPropertyItem *rna_GPConvert_mode_items(bContext *UNUSED(C), PointerRN
 /* convert the coordinates from the given stroke point into 3d-coordinates
  *	- assumes that the active space is the 3D-View
  */
-static void gp_strokepoint_convertcoords(bContext *C, bGPDstroke *gps, bGPDspoint *pt, float p3d[3], rctf *subrect)
+static void gp_strokepoint_convertcoords(
+        bContext *C, bGPDlayer *gpl, bGPDstroke *gps, bGPDspoint *source_pt,
+        float p3d[3], const rctf *subrect)
 {
 	Scene *scene = CTX_data_scene(C);
 	View3D *v3d = CTX_wm_view3d(C);
 	ARegion *ar = CTX_wm_region(C);
-	
+	bGPDspoint mypt, *pt;
+
+	float diff_mat[4][4];
+	pt = &mypt;
+
+	/* calculate difference matrix if parent object */
+	if (gpl->parent == NULL) {
+		copy_v3_v3(&pt->x, &source_pt->x);
+	}
+	else {
+		/* apply parent transform */
+		float fpt[3];
+		ED_gpencil_parent_location(gpl, diff_mat);
+		mul_v3_m4v3(fpt, diff_mat, &source_pt->x);
+		copy_v3_v3(&pt->x, fpt);
+	}
+
+
 	if (gps->flag & GP_STROKE_3DSPACE) {
 		/* directly use 3d-coordinates */
 		copy_v3_v3(p3d, &pt->x);
@@ -628,7 +647,7 @@ static void gp_stroke_to_path(bContext *C, bGPDlayer *gpl, bGPDstroke *gps, Curv
 		bp = &nu->bp[old_nbp - 1];
 		
 		/* First point */
-		gp_strokepoint_convertcoords(C, gps, gps->points, p, subrect);
+		gp_strokepoint_convertcoords(C, gpl, gps, gps->points, p, subrect);
 		if (prev_bp) {
 			interp_v3_v3v3(p1, bp->vec, prev_bp->vec, -GAP_DFAC);
 			if (do_gtd) {
@@ -649,7 +668,7 @@ static void gp_stroke_to_path(bContext *C, bGPDlayer *gpl, bGPDstroke *gps, Curv
 		/* Second point */
 		/* Note dt2 is always negative, which marks the gap. */
 		if (gps->totpoints > 1) {
-			gp_strokepoint_convertcoords(C, gps, gps->points + 1, next_p, subrect);
+			gp_strokepoint_convertcoords(C, gpl, gps, gps->points + 1, next_p, subrect);
 			interp_v3_v3v3(p2, p, next_p, -GAP_DFAC);
 			if (do_gtd) {
 				dt2 = interpf(gps->points[1].time, gps->points[0].time, -GAP_DFAC);
@@ -670,9 +689,9 @@ static void gp_stroke_to_path(bContext *C, bGPDlayer *gpl, bGPDstroke *gps, Curv
 		float p[3], next_p[3];
 		float dt = 0.0f;
 		
-		gp_strokepoint_convertcoords(C, gps, gps->points, p, subrect);
+		gp_strokepoint_convertcoords(C, gpl, gps, gps->points, p, subrect);
 		if (gps->totpoints > 1) {
-			gp_strokepoint_convertcoords(C, gps, gps->points + 1, next_p, subrect);
+			gp_strokepoint_convertcoords(C, gpl, gps, gps->points + 1, next_p, subrect);
 			interp_v3_v3v3(p, p, next_p, -GAP_DFAC);
 			if (do_gtd) {
 				dt = interpf(gps->points[1].time, gps->points[0].time, -GAP_DFAC);
@@ -701,10 +720,10 @@ static void gp_stroke_to_path(bContext *C, bGPDlayer *gpl, bGPDstroke *gps, Curv
 	     i++, pt++, bp++)
 	{
 		float p[3];
-		float width = pt->pressure * gpl->thickness * WIDTH_CORR_FAC;
+		float width = pt->pressure * (gps->thickness + gpl->thickness) * WIDTH_CORR_FAC;
 		
 		/* get coordinates to add at */
-		gp_strokepoint_convertcoords(C, gps, pt, p, subrect);
+		gp_strokepoint_convertcoords(C, gpl, gps, pt, p, subrect);
 		
 		gp_stroke_to_path_add_point(gtd, bp, p, (prev_bp) ? prev_bp->vec : p, do_gtd, gps->inittime, pt->time,
 		                            width, rad_fac, minmax_weights);
@@ -816,12 +835,12 @@ static void gp_stroke_to_bezier(bContext *C, bGPDlayer *gpl, bGPDstroke *gps, Cu
 	/* get initial coordinates */
 	pt = gps->points;
 	if (tot) {
-		gp_strokepoint_convertcoords(C, gps, pt, (stitch) ? p3d_prev : p3d_cur, subrect);
+		gp_strokepoint_convertcoords(C, gpl, gps, pt, (stitch) ? p3d_prev : p3d_cur, subrect);
 		if (tot > 1) {
-			gp_strokepoint_convertcoords(C, gps, pt + 1, (stitch) ? p3d_cur : p3d_next, subrect);
+			gp_strokepoint_convertcoords(C, gpl, gps, pt + 1, (stitch) ? p3d_cur : p3d_next, subrect);
 		}
 		if (stitch && tot > 2) {
-			gp_strokepoint_convertcoords(C, gps, pt + 2, p3d_next, subrect);
+			gp_strokepoint_convertcoords(C, gpl, gps, pt + 2, p3d_next, subrect);
 		}
 	}
 	
@@ -940,7 +959,7 @@ static void gp_stroke_to_bezier(bContext *C, bGPDlayer *gpl, bGPDstroke *gps, Cu
 	
 	/* add points */
 	for (i = stitch ? 1 : 0, bezt = &nu->bezt[old_nbezt]; i < tot; i++, pt++, bezt++) {
-		float width = pt->pressure * gpl->thickness * WIDTH_CORR_FAC;
+		float width = pt->pressure * (gps->thickness + gpl->thickness) * WIDTH_CORR_FAC;
 		
 		if (i || old_nbezt) {
 			interp_v3_v3v3(h1, p3d_cur, p3d_prev, BEZT_HANDLE_FAC);
@@ -964,7 +983,7 @@ static void gp_stroke_to_bezier(bContext *C, bGPDlayer *gpl, bGPDstroke *gps, Cu
 		copy_v3_v3(p3d_cur, p3d_next);
 		
 		if (i + 2 < tot) {
-			gp_strokepoint_convertcoords(C, gps, pt + 2, p3d_next, subrect);
+			gp_strokepoint_convertcoords(C, gpl, gps, pt + 2, p3d_next, subrect);
 		}
 		
 		prev_bezt = bezt;
diff --git a/source/blender/editors/gpencil/gpencil_data.c b/source/blender/editors/gpencil/gpencil_data.c
index 746497f0ff5..e915446e461 100644
--- a/source/blender/editors/gpencil/gpencil_data.c
+++ b/source/blender/editors/gpencil/gpencil_data.c
@@ -18,7 +18,7 @@
  * The Original Code is Copyright (C) 2008, Blender Foundation, Joshua Leung
  * This is a new part of Blender
  *
- * Contributor(s): Joshua Leung
+ * Contributor(s): Joshua Leung, Antonio Vazquez
  *
  * ***** END GPL LICENSE BLOCK *****
  *
@@ -40,6 +40,8 @@
 
 #include "BLI_blenlib.h"
 #include "BLI_utildefines.h"
+#include "BLI_ghash.h"
+#include "BLI_math.h"
 
 #include "BLT_translation.h"
 
@@ -57,6 +59,7 @@
 #include "BKE_report.h"
 #include "BKE_scene.h"
 #include "BKE_screen.h"
+#include "BKE_colortools.h"
 
 #include "UI_interface.h"
 #include "UI_resources.h"
@@ -72,6 +75,8 @@
 
 #include "gpencil_intern.h"
 
+/* maximum sizes of gp-session buffer */
+#define GP_STROKE_BUFFER_MAX    5000
 
 /* ************************************************ */
 /* Datablock Operators */
@@ -596,6 +601,61 @@ void GPENCIL_OT_layer_isolate(wmOperatorType *ot)
 	                "In addition to toggling the editability, also affect the visibility");
 }
 
+/* ********************** Merge Layer with the next layer **************************** */
+
+static int gp_merge_layer_exec(bContext *C, wmOperator *op)
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDlayer *gpl_current = gpencil_layer_getactive(gpd);
+	bGPDlayer *gpl_next = gpl_current->next;
+
+	if (ELEM(NULL, gpd, gpl_current, gpl_next)) {
+		BKE_report(op->reports, RPT_ERROR, "No layers to merge");
+		return OPERATOR_CANCELLED;
+	}
+
+	/* Collect frames of gpl_current in hash table to avoid O(n^2) lookups */
+	GHash *gh_frames_cur = BLI_ghash_int_new_ex(__func__, 64);
+	for (bGPDframe *gpf = gpl_current->frames.first; gpf; gpf = gpf->next) {
+		BLI_ghash_insert(gh_frames_cur, SET_INT_IN_POINTER(gpf->framenum), gpf);
+	}
+
+	/* read all frames from next layer */
+	for (bGPDframe *gpf = gpl_next->frames.first; gpf; gpf = gpf->next) {
+		/* try to find frame in active layer */
+		bGPDframe *frame = BLI_ghash_lookup(gh_frames_cur, SET_INT_IN_POINTER(gpf->framenum));
+		if (!frame) {
+			/* nothing found, create new */
+			frame = gpencil_frame_addnew(gpl_current, gpf->framenum);
+		}
+		/* add to tail all strokes */
+		BLI_movelisttolist(&frame->strokes, &gpf->strokes);
+	}
+	/* Now delete next layer */
+	gpencil_layer_delete(gpd, gpl_next);
+	BLI_ghash_free(gh_frames_cur, NULL, NULL);
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_layer_merge(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Merge Down";
+	ot->idname = "GPENCIL_OT_layer_merge";
+	ot->description = "Merge the current layer with the layer below";
+
+	/* callbacks */
+	ot->exec = gp_merge_layer_exec;
+	ot->poll = gp_active_layer_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
 /* ********************** Change Layer ***************************** */
 
 static int gp_layer_change_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(evt))
@@ -663,3 +723,1740 @@ void GPENCIL_OT_layer_change(wmOperatorType *ot)
 }
 
 /* ************************************************ */
+
+/* ******************* Arrange Stroke Up/Down in drawing order ************************** */
+
+enum {
+	GP_STROKE_MOVE_UP = -1,
+	GP_STROKE_MOVE_DOWN = 1,
+	GP_STROKE_MOVE_TOP = 2,
+	GP_STROKE_MOVE_BOTTOM = 3
+};
+
+static int gp_stroke_arrange_exec(bContext *C, wmOperator *op)
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDlayer *gpl = gpencil_layer_getactive(gpd);
+	bGPDstroke *gps;
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd, gpl, gpl->actframe)) {
+		return OPERATOR_CANCELLED;
+	}
+
+	bGPDframe *gpf = gpl->actframe;
+	/* temp listbase to store selected strokes */
+	ListBase selected = {NULL};
+	const int direction = RNA_enum_get(op->ptr, "type");
+
+	/* verify if any selected stroke is in the extreme of the stack and select to move */
+	for (gps = gpf->strokes.first; gps; gps = gps->next) {
+		/* only if selected */
+		if (gps->flag & GP_STROKE_SELECT) {
+			/* skip strokes that are invalid for current view */
+			if (ED_gpencil_stroke_can_use(C, gps) == false) {
+				continue;
+			}
+			/* check if the color is editable */
+			if (ED_gpencil_stroke_color_use(gpl, gps) == false) {
+				continue;
+			}
+			/* some stroke is already at front*/
+			if ((direction == GP_STROKE_MOVE_TOP) || (direction == GP_STROKE_MOVE_UP)) {
+				if (gps == gpf->strokes.last) {
+					BKE_report(op->reports, RPT_ERROR, "Some selected stroke is already on top");
+					return OPERATOR_CANCELLED;
+				}
+			}
+			/* some stroke is already at botom */
+			if ((direction == GP_STROKE_MOVE_BOTTOM) || (direction == GP_STROKE_MOVE_DOWN)) {
+				if (gps == gpf->strokes.first) {
+					BKE_report(op->reports, RPT_ERROR, "Some selected stroke is already on bottom");
+					return OPERATOR_CANCELLED;
+				}
+			}
+			/* add to list */
+			BLI_addtail(&selected, BLI_genericNodeN(gps));
+		}
+	}
+
+	/* Now do the movement of the stroke */
+	switch (direction) {
+		/* Bring to Front */
+		case GP_STROKE_MOVE_TOP:
+			for (LinkData *link = selected.first; link; link = link->next) {
+				gps = link->data;
+				BLI_remlink(&gpf->strokes, gps);
+				BLI_insertlinkafter(&gpf->strokes, gpf->strokes.last, gps);
+			}
+			break;
+		/* Bring Forward */
+		case GP_STROKE_MOVE_UP:
+			for (LinkData *link = selected.last; link; link = link->prev) {
+				gps = link->data;
+				BLI_remlink(&gpf->strokes, gps);
+				BLI_insertlinkafter(&gpf->strokes, gps->next, gps);
+			}
+			break;
+			/* Send Backward */
+		case GP_STROKE_MOVE_DOWN:
+			for (LinkData *link = selected.first; link; link = link->next) {
+				gps = link->data;
+				BLI_remlink(&gpf->strokes, gps);
+				BLI_insertlinkbefore(&gpf->strokes, gps->prev, gps);
+			}
+			break;
+		/* Send to Back */
+		case GP_STROKE_MOVE_BOTTOM:
+			for (LinkData *link = selected.last; link; link = link->prev) {
+				gps = link->data;
+				BLI_remlink(&gpf->strokes, gps);
+				BLI_insertlinkbefore(&gpf->strokes, gpf->strokes.first, gps);
+			}
+			break;
+		default:
+			BLI_assert(0);
+			break;
+	}
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_stroke_arrange(wmOperatorType *ot)
+{
+	static EnumPropertyItem slot_move[] = {
+		{GP_STROKE_MOVE_UP, "UP", 0, "Bring Forward", ""},
+		{GP_STROKE_MOVE_DOWN, "DOWN", 0, "Send Backward", ""},
+		{GP_STROKE_MOVE_TOP, "TOP", 0, "Bring to Front", ""},
+		{GP_STROKE_MOVE_BOTTOM, "BOTTOM", 0, "Send to Back", ""},
+		{0, NULL, 0, NULL, NULL }
+	};
+
+	/* identifiers */
+	ot->name = "Arrange Stroke";
+	ot->idname = "GPENCIL_OT_stroke_arrange";
+	ot->description = "Arrange selected strokes up/down in the drawing order of the active layer";
+
+	/* api callbacks */
+	ot->exec = gp_stroke_arrange_exec;
+	ot->poll = gp_active_layer_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	ot->prop = RNA_def_enum(ot->srna, "direction", slot_move, GP_STROKE_MOVE_UP, "Direction", "");
+}
+/* ******************* Move Stroke to new color ************************** */
+
+static int gp_stroke_change_color_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette;
+	bGPDpalettecolor *color;
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd)) {
+		return OPERATOR_CANCELLED;
+	}
+
+	palette = gpencil_palette_getactive(gpd);
+	color = gpencil_palettecolor_getactive(palette);
+	if (ELEM(NULL, palette, color)) {
+		return OPERATOR_CANCELLED;
+	}
+
+	/* loop all strokes */
+	for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+		/* only editable and visible layers are considered */
+		if (gpencil_layer_is_editable(gpl) && (gpl->actframe != NULL)) {
+			for (bGPDstroke *gps = gpl->actframe->strokes.last; gps; gps = gps->prev) {
+				/* only if selected */
+				if (gps->flag & GP_STROKE_SELECT) {
+					/* skip strokes that are invalid for current view */
+					if (ED_gpencil_stroke_can_use(C, gps) == false)
+						continue;
+					/* check if the color is editable */
+					if (ED_gpencil_stroke_color_use(gpl, gps) == false)
+						continue;
+
+					/* asign new color (only if different) */
+					if (STREQ(gps->colorname, color->info) == false) {
+						strcpy(gps->colorname, color->info);
+						gps->flag |= GP_STROKE_RECALC_COLOR;
+					}
+				}
+			}
+		}
+	}
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_stroke_change_color(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Change Stroke Color";
+	ot->idname = "GPENCIL_OT_stroke_change_color";
+	ot->description = "Move selected strokes to active color";
+
+	/* api callbacks */
+	ot->exec = gp_stroke_change_color_exec;
+	ot->poll = gp_active_layer_poll;
+}
+
+/* ******************* Lock color of non selected Strokes colors ************************** */
+
+static int gp_stroke_lock_color_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette;
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd))
+		return OPERATOR_CANCELLED;
+
+	palette = gpencil_palette_getactive(gpd);
+	if (ELEM(NULL, palette))
+		return OPERATOR_CANCELLED;
+
+	/* first lock all colors */
+	for (bGPDpalettecolor *palcolor = palette->colors.first; palcolor; palcolor = palcolor->next) {
+		palcolor->flag |= PC_COLOR_LOCKED;
+	}
+
+	/* loop all selected strokes and unlock any color */
+	for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+		/* only editable and visible layers are considered */
+		if (gpencil_layer_is_editable(gpl) && (gpl->actframe != NULL)) {
+			for (bGPDstroke *gps = gpl->actframe->strokes.last; gps; gps = gps->prev) {
+				/* only if selected */
+				if (gps->flag & GP_STROKE_SELECT) {
+					/* skip strokes that are invalid for current view */
+					if (ED_gpencil_stroke_can_use(C, gps) == false) {
+						continue;
+					}
+					/* unlock color */
+					if (gps->palcolor != NULL) {
+						gps->palcolor->flag &= ~PC_COLOR_LOCKED;
+					}
+				}
+			}
+		}
+	}
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_stroke_lock_color(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Lock Unused Colors";
+	ot->idname = "GPENCIL_OT_stroke_lock_color";
+	ot->description = "Lock any color not used in any selected stroke";
+
+	/* api callbacks */
+	ot->exec = gp_stroke_lock_color_exec;
+	ot->poll = gp_active_layer_poll;
+}
+
+/* ******************* Apply layer thickness change to Strokes ************************** */
+
+static int gp_stroke_apply_thickness_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDlayer *gpl = gpencil_layer_getactive(gpd);
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd, gpl, gpl->frames.first))
+		return OPERATOR_CANCELLED;
+
+	/* loop all strokes */
+	for (bGPDframe *gpf = gpl->frames.first; gpf; gpf = gpf->next) {
+		for (bGPDstroke *gps = gpf->strokes.first; gps; gps = gps->next) {
+			/* Apply thickness */
+			gps->thickness = gps->thickness + gpl->thickness;
+		}
+	}
+	/* clear value */
+	gpl->thickness = 0.0f;
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_stroke_apply_thickness(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Apply Stroke Thickness";
+	ot->idname = "GPENCIL_OT_stroke_apply_thickness";
+	ot->description = "Apply the thickness change of the layer to its strokes";
+
+	/* api callbacks */
+	ot->exec = gp_stroke_apply_thickness_exec;
+	ot->poll = gp_active_layer_poll;
+}
+
+/* ******************* Close Strokes ************************** */
+
+enum {
+	GP_STROKE_CYCLIC_CLOSE = 1,
+	GP_STROKE_CYCLIC_OPEN = 2,
+	GP_STROKE_CYCLIC_TOGGLE = 3
+};
+
+static int gp_stroke_cyclical_set_exec(bContext *C, wmOperator *op)
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	const int type = RNA_enum_get(op->ptr, "type");
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd))
+		return OPERATOR_CANCELLED;
+
+	/* loop all selected strokes */
+	CTX_DATA_BEGIN(C, bGPDlayer *, gpl, editable_gpencil_layers)
+	{
+		for (bGPDstroke *gps = gpl->actframe->strokes.last; gps; gps = gps->prev) {
+			bGPDpalettecolor *palcolor = gps->palcolor;
+
+			/* skip strokes that are not selected or invalid for current view */
+			if (((gps->flag & GP_STROKE_SELECT) == 0) || ED_gpencil_stroke_can_use(C, gps) == false)
+				continue;
+			/* skip hidden or locked colors */
+			if (!palcolor || (palcolor->flag & PC_COLOR_HIDE) || (palcolor->flag & PC_COLOR_LOCKED))
+				continue;
+
+			switch (type) {
+				case GP_STROKE_CYCLIC_CLOSE:
+					/* Close all (enable) */
+					gps->flag |= GP_STROKE_CYCLIC;
+					break;
+				case GP_STROKE_CYCLIC_OPEN:
+					/* Open all (disable) */
+					gps->flag &= ~GP_STROKE_CYCLIC;
+					break;
+				case GP_STROKE_CYCLIC_TOGGLE:
+					/* Just toggle flag... */
+					gps->flag ^= GP_STROKE_CYCLIC;
+					break;
+				default:
+					BLI_assert(0);
+					break;
+			}
+		}
+	}
+	CTX_DATA_END;
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+/**
+ * Similar to #CURVE_OT_cyclic_toggle or #MASK_OT_cyclic_toggle, but with
+ * option to force opened/closed strokes instead of just toggle behavior.
+ */
+void GPENCIL_OT_stroke_cyclical_set(wmOperatorType *ot)
+{
+	static EnumPropertyItem cyclic_type[] = {
+		{GP_STROKE_CYCLIC_CLOSE, "CLOSE", 0, "Close all", ""},
+		{GP_STROKE_CYCLIC_OPEN, "OPEN", 0, "Open all", ""},
+		{GP_STROKE_CYCLIC_TOGGLE, "TOGGLE", 0, "Toggle", ""},
+		{0, NULL, 0, NULL, NULL}
+	};
+
+	/* identifiers */
+	ot->name = "Set Cyclical State";
+	ot->idname = "GPENCIL_OT_stroke_cyclical_set";
+	ot->description = "Close or open the selected stroke adding an edge from last to first point";
+
+	/* api callbacks */
+	ot->exec = gp_stroke_cyclical_set_exec;
+	ot->poll = gp_active_layer_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	ot->prop = RNA_def_enum(ot->srna, "type", cyclic_type, GP_STROKE_CYCLIC_TOGGLE, "Type", "");
+}
+
+/* ******************* Stroke join ************************** */
+
+/* Helper: flip stroke */
+static void gpencil_flip_stroke(bGPDstroke *gps)
+{
+	bGPDspoint pt, *point, *point2;
+	int end = gps->totpoints - 1;
+
+	for (int i = 0; i < gps->totpoints / 2; i++) {
+		/* save first point */
+		point = &gps->points[i];
+		pt.x = point->x;
+		pt.y = point->y;
+		pt.z = point->z;
+		pt.flag = point->flag;
+		pt.pressure = point->pressure;
+		pt.strength = point->strength;
+		pt.time = point->time;
+
+		/* replace first point with last point */
+		point2 = &gps->points[end];
+		point->x = point2->x;
+		point->y = point2->y;
+		point->z = point2->z;
+		point->flag = point2->flag;
+		point->pressure = point2->pressure;
+		point->strength = point2->strength;
+		point->time = point2->time;
+
+		/* replace last point with first saved before */
+		point = &gps->points[end];
+		point->x = pt.x;
+		point->y = pt.y;
+		point->z = pt.z;
+		point->flag = pt.flag;
+		point->pressure = pt.pressure;
+		point->strength = pt.strength;
+		point->time = pt.time;
+
+		end--;
+	}
+}
+
+/* Helper: copy point between strokes */
+static void gpencil_stroke_copy_point(bGPDstroke *gps, bGPDspoint *point, float delta[3],
+                                      float pressure, float strength, float deltatime)
+{
+	bGPDspoint *newpoint;
+
+	gps->points = MEM_reallocN(gps->points, sizeof(bGPDspoint) * (gps->totpoints + 1));
+	gps->totpoints++;
+
+	newpoint = &gps->points[gps->totpoints - 1];
+	newpoint->x = point->x * delta[0];
+	newpoint->y = point->y * delta[1];
+	newpoint->z = point->z * delta[2];
+	newpoint->flag = point->flag;
+	newpoint->pressure = pressure;
+	newpoint->strength = strength;
+	newpoint->time = point->time + deltatime;
+}
+
+/* Helper: join two strokes using the shortest distance (reorder stroke if necessary ) */
+static void gpencil_stroke_join_strokes(bGPDstroke *gps_a, bGPDstroke *gps_b)
+{
+	bGPDspoint point, *pt;
+	int i;
+	float delta[3] = {1.0f, 1.0f, 1.0f};
+	float deltatime = 0.0f;
+
+	/* sanity checks */
+	if (ELEM(NULL, gps_a, gps_b))
+		return;
+
+	if ((gps_a->totpoints == 0) || (gps_b->totpoints == 0))
+		return;
+
+	/* define start and end points of each stroke */
+	float sa[3], sb[3], ea[3], eb[3];
+	pt = &gps_a->points[0];
+	copy_v3_v3(sa, &pt->x);
+
+	pt = &gps_a->points[gps_a->totpoints - 1];
+	copy_v3_v3(ea, &pt->x);
+
+	pt = &gps_b->points[0];
+	copy_v3_v3(sb, &pt->x);
+	
+	pt = &gps_b->points[gps_b->totpoints - 1];
+	copy_v3_v3(eb, &pt->x);
+	/* review if need flip stroke B */
+	float ea_sb = len_squared_v3v3(ea, sb);
+	float ea_eb = len_squared_v3v3(ea, eb);
+	/* flip if distance to end point is shorter */
+	if (ea_eb < ea_sb) {
+		gpencil_flip_stroke(gps_b);
+	}
+
+	/* 1st: add one tail point to start invisible area */
+	point = gps_a->points[gps_a->totpoints - 1];
+	deltatime = point.time;
+	gpencil_stroke_copy_point(gps_a, &point, delta, 0.0f, 0.0f, 0.0f);
+
+	/* 2nd: add one head point to finish invisible area */
+	point = gps_b->points[0];
+	gpencil_stroke_copy_point(gps_a, &point, delta, 0.0f, 0.0f, deltatime);
+
+	/* 3rd: add all points */
+	for (i = 0, pt = gps_b->points; i < gps_b->totpoints && pt; i++, pt++) {
+		/* check if still room in buffer */
+		if (gps_a->totpoints <= GP_STROKE_BUFFER_MAX - 2) {
+			gpencil_stroke_copy_point(gps_a, pt, delta, pt->pressure, pt->strength, deltatime);
+		}
+	}
+}
+
+enum {
+	GP_STROKE_JOIN = -1,
+	GP_STROKE_JOINCOPY = 1
+};
+
+static int gp_stroke_join_exec(bContext *C, wmOperator *op)
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDlayer *activegpl = gpencil_layer_getactive(gpd);
+	bGPDstroke *gps, *gpsn;
+	bGPDpalette *palette = gpencil_palette_getactive(gpd);
+	bGPDpalettecolor *palcolor = gpencil_palettecolor_getactive(palette);
+
+	bGPDframe *gpf_a = NULL;
+	bGPDstroke *stroke_a = NULL;
+	bGPDstroke *stroke_b = NULL;
+	bGPDstroke *new_stroke = NULL;
+
+	int type = RNA_enum_get(op->ptr, "type");
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd))
+		return OPERATOR_CANCELLED;
+
+	if (activegpl->flag & GP_LAYER_LOCKED)
+		return OPERATOR_CANCELLED;
+
+	BLI_assert(ELEM(type, GP_STROKE_JOIN, GP_STROKE_JOINCOPY));
+
+
+	/* read all selected strokes */
+	bool first = false;
+	CTX_DATA_BEGIN(C, bGPDlayer *, gpl, editable_gpencil_layers)
+	{
+		bGPDframe *gpf = gpl->actframe;
+		for (gps = gpf->strokes.first; gps; gps = gpsn) {
+			gpsn = gps->next;
+			if (gps->flag & GP_STROKE_SELECT) {
+				/* skip strokes that are invalid for current view */
+				if (ED_gpencil_stroke_can_use(C, gps) == false) {
+					continue;
+				}
+				/* check if the color is editable */
+				if (ED_gpencil_stroke_color_use(gpl, gps) == false) {
+					continue;
+				}
+				/* to join strokes, cyclic must be disabled */
+				gps->flag &= ~GP_STROKE_CYCLIC;
+				/* saves first frame and stroke */
+				if (!first) {
+					first = true;
+					gpf_a = gpf;
+					stroke_a = gps;
+				}
+				else {
+					stroke_b = gps;
+					/* create a new stroke if was not created before (only created if something to join) */
+					if (new_stroke == NULL) {
+						new_stroke = MEM_dupallocN(stroke_a);
+						new_stroke->points = MEM_dupallocN(stroke_a->points);
+						new_stroke->triangles = NULL;
+						new_stroke->tot_triangles = 0;
+						new_stroke->flag |= GP_STROKE_RECALC_CACHES;
+						/* if new, set current color */
+						if (type == GP_STROKE_JOINCOPY) {
+							new_stroke->palcolor = palcolor;
+							strcpy(new_stroke->colorname, palcolor->info);
+							new_stroke->flag |= GP_STROKE_RECALC_COLOR;
+						}
+					}
+					/* join new_stroke and stroke B. New stroke will contain all the previous data */
+					gpencil_stroke_join_strokes(new_stroke, stroke_b);
+
+					/* if join only, delete old strokes */
+					if (type == GP_STROKE_JOIN) {
+						if (stroke_a) {
+							BLI_insertlinkbefore(&gpf_a->strokes, stroke_a, new_stroke);
+							BLI_remlink(&gpf->strokes, stroke_a);
+							free_gpencil_stroke(stroke_a);
+							stroke_a = NULL;
+						}
+						if (stroke_b) {
+							BLI_remlink(&gpf->strokes, stroke_b);
+							free_gpencil_stroke(stroke_b);
+							stroke_b = NULL;
+						}
+					}
+				}
+			}
+		}
+	}
+	CTX_DATA_END;
+	/* add new stroke if was not added before */
+	if (type == GP_STROKE_JOINCOPY) {
+		if (new_stroke) {
+			/* Add a new frame if needed */
+			if (activegpl->actframe == NULL)
+				activegpl->actframe = gpencil_frame_addnew(activegpl, gpf_a->framenum);
+
+			BLI_addtail(&activegpl->actframe->strokes, new_stroke);
+		}
+	}
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_stroke_join(wmOperatorType *ot)
+{
+	static EnumPropertyItem join_type[] = {
+		{GP_STROKE_JOIN, "JOIN", 0, "Join", ""},
+		{GP_STROKE_JOINCOPY, "JOINCOPY", 0, "Join and Copy", ""},
+		{0, NULL, 0, NULL, NULL}
+	};
+
+	/* identifiers */
+	ot->name = "Join Strokes";
+	ot->idname = "GPENCIL_OT_stroke_join";
+	ot->description = "Join selected strokes (optionally as new stroke)";
+
+	/* api callbacks */
+	ot->exec = gp_stroke_join_exec;
+	ot->poll = gp_active_layer_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	ot->prop = RNA_def_enum(ot->srna, "type", join_type, GP_STROKE_JOIN, "Type", "");
+}
+
+/* ******************* Stroke flip ************************** */
+
+static int gp_stroke_flip_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd))
+		return OPERATOR_CANCELLED;
+
+	/* read all selected strokes */
+	CTX_DATA_BEGIN(C, bGPDlayer *, gpl, editable_gpencil_layers)
+	{
+		bGPDframe *gpf = gpl->actframe;
+		for (bGPDstroke *gps = gpf->strokes.first; gps; gps = gps->next) {
+			if (gps->flag & GP_STROKE_SELECT) {
+				/* skip strokes that are invalid for current view */
+				if (ED_gpencil_stroke_can_use(C, gps) == false) {
+					continue;
+				}
+				/* check if the color is editable */
+				if (ED_gpencil_stroke_color_use(gpl, gps) == false) {
+					continue;
+				}
+				/* flip stroke */
+				gpencil_flip_stroke(gps);
+			}
+		}
+	}
+	CTX_DATA_END;
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_stroke_flip(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Flip Stroke";
+	ot->idname = "GPENCIL_OT_stroke_flip";
+	ot->description = "Change drawing direction of selected strokes";
+
+	/* api callbacks */
+	ot->exec = gp_stroke_flip_exec;
+	ot->poll = gp_active_layer_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+/* ************************************************ */
+/* Drawing Brushes Operators */
+
+/* ******************* Add New Brush ************************ */
+
+/* add new brush - wrapper around API */
+static int gp_brush_add_exec(bContext *C, wmOperator *op)
+{
+	ToolSettings *ts = CTX_data_tool_settings(C);
+
+	/* if there's no existing container */
+	if (ts == NULL) {
+		BKE_report(op->reports, RPT_ERROR, "Nowhere for brush data to go");
+		return OPERATOR_CANCELLED;
+	}
+	/* add new brush now */
+	gpencil_brush_addnew(ts, DATA_("GP_Brush"), true);
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_brush_add(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Add Brush";
+	ot->idname = "GPENCIL_OT_brush_add";
+	ot->description = "Add new Grease Pencil drawing brush for the active Grease Pencil datablock";
+
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* callbacks */
+	ot->exec = gp_brush_add_exec;
+	ot->poll = gp_add_poll;
+}
+
+/* ******************* Remove Active Brush ************************* */
+
+static int gp_brush_remove_exec(bContext *C, wmOperator *op)
+{
+	ToolSettings *ts = CTX_data_tool_settings(C);
+	bGPDbrush *brush = gpencil_brush_getactive(ts);
+
+	/* sanity checks */
+	if (ELEM(NULL, ts, brush))
+		return OPERATOR_CANCELLED;
+
+	if (BLI_listbase_count(&ts->gp_brushes) < 2) {
+		BKE_report(op->reports, RPT_ERROR, "Grease Pencil needs a brush. Unable to delete brush");
+		return OPERATOR_CANCELLED;
+	}
+
+
+	/* make the brush before this the new active brush
+	 * - use the one after if this is the first
+	 * - if this is the only brush, this naturally becomes NULL
+	 */
+	if (brush->prev)
+		gpencil_brush_setactive(ts, brush->prev);
+	else
+		gpencil_brush_setactive(ts, brush->next);
+
+	/* delete the brush now... */
+	gpencil_brush_delete(ts, brush);
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_brush_remove(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Remove brush";
+	ot->idname = "GPENCIL_OT_brush_remove";
+	ot->description = "Remove active Grease Pencil drawing brush";
+
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* callbacks */
+	ot->exec = gp_brush_remove_exec;
+	ot->poll = gp_active_brush_poll;
+}
+
+/* ********************** Change Brush ***************************** */
+
+static int gp_brush_change_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(evt))
+{
+	uiPopupMenu *pup;
+	uiLayout *layout;
+
+	/* call the menu, which will call this operator again, hence the canceled */
+	pup = UI_popup_menu_begin(C, op->type->name, ICON_NONE);
+	layout = UI_popup_menu_layout(pup);
+	uiItemsEnumO(layout, "GPENCIL_OT_brush_change", "brush");
+	UI_popup_menu_end(C, pup);
+
+	return OPERATOR_INTERFACE;
+}
+
+static int gp_brush_change_exec(bContext *C, wmOperator *op)
+{
+	ToolSettings *ts = CTX_data_tool_settings(C);
+	bGPDbrush *brush = NULL;
+	int brush_num = RNA_enum_get(op->ptr, "brush");
+
+	/* Get brush or create new one */
+	if (brush_num == -1) {
+		/* Create brush */
+		brush = gpencil_brush_addnew(ts, DATA_("GP_Brush"), true);
+	}
+	else {
+		/* Try to get brush */
+		brush = BLI_findlink(&ts->gp_brushes, brush_num);
+
+		if (brush == NULL) {
+			BKE_reportf(op->reports, RPT_ERROR, "Cannot change to non-existent brush (index = %d)", brush_num);
+			return OPERATOR_CANCELLED;
+		}
+	}
+
+	/* Set active brush */
+	gpencil_brush_setactive(ts, brush);
+
+	/* updates */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_brush_change(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Change Brush";
+	ot->idname = "GPENCIL_OT_brush_change";
+	ot->description = "Change active Grease Pencil drawing brush";
+
+	/* callbacks */
+	ot->invoke = gp_brush_change_invoke;
+	ot->exec = gp_brush_change_exec;
+	ot->poll = gp_active_brush_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* gp brush to use (dynamic enum) */
+	ot->prop = RNA_def_enum(ot->srna, "brush", DummyRNA_DEFAULT_items, 0, "Grease Pencil Brush", "");
+	RNA_def_enum_funcs(ot->prop, ED_gpencil_brushes_enum_itemf);
+}
+
+/* ******************* Move Brush Up/Down ************************** */
+
+enum {
+	GP_BRUSH_MOVE_UP = -1,
+	GP_BRUSH_MOVE_DOWN = 1
+};
+
+static int gp_brush_move_exec(bContext *C, wmOperator *op)
+{
+	ToolSettings *ts = CTX_data_tool_settings(C);
+	bGPDbrush *brush = gpencil_brush_getactive(ts);
+
+	int direction = RNA_enum_get(op->ptr, "type");
+
+	/* sanity checks */
+	if (ELEM(NULL, ts, brush)) {
+		return OPERATOR_CANCELLED;
+	}
+
+	/* up or down? */
+	if (direction == GP_BRUSH_MOVE_UP) {
+		/* up */
+		BLI_remlink(&ts->gp_brushes, brush);
+		BLI_insertlinkbefore(&ts->gp_brushes, brush->prev, brush);
+	}
+	else if (direction == GP_BRUSH_MOVE_DOWN) {
+		/* down */
+		BLI_remlink(&ts->gp_brushes, brush);
+		BLI_insertlinkafter(&ts->gp_brushes, brush->next, brush);
+	}
+	else {
+		BLI_assert(0);
+	}
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_brush_move(wmOperatorType *ot)
+{
+	static EnumPropertyItem slot_move[] = {
+		{GP_BRUSH_MOVE_UP, "UP", 0, "Up", ""},
+		{GP_BRUSH_MOVE_DOWN, "DOWN", 0, "Down", ""},
+		{0, NULL, 0, NULL, NULL }
+	};
+
+	/* identifiers */
+	ot->name = "Move Brush";
+	ot->idname = "GPENCIL_OT_brush_move";
+	ot->description = "Move the active Grease Pencil drawing brush up/down in the list";
+
+	/* api callbacks */
+	ot->exec = gp_brush_move_exec;
+	ot->poll = gp_active_brush_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	ot->prop = RNA_def_enum(ot->srna, "type", slot_move, GP_BRUSH_MOVE_UP, "Type", "");
+}
+
+/* ******************* Brush create presets ************************** */
+
+static int gp_brush_presets_create_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	ToolSettings *ts = CTX_data_tool_settings(C);
+	gpencil_brush_init_presets(ts);
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_brush_presets_create(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Create Preset Brushes";
+	ot->idname = "GPENCIL_OT_brush_presets_create";
+	ot->description = "Create a set of predefined Grease Pencil drawing brushes";
+
+	/* api callbacks */
+	ot->exec = gp_brush_presets_create_exec;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+}
+
+/* ***************** Copy Brush ************************ */
+
+static int gp_brush_copy_exec(bContext *C, wmOperator *op)
+{
+	ToolSettings *ts = CTX_data_tool_settings(C);
+
+	/* if there's no existing container */
+	if (ts == NULL) {
+		BKE_report(op->reports, RPT_ERROR, "Nowhere for brush data to go");
+		return OPERATOR_CANCELLED;
+	}
+
+	bGPDbrush *brush = gpencil_brush_getactive(ts);
+	bGPDbrush *newbrush;
+
+	/* sanity checks */
+	if (ELEM(NULL, brush))
+		return OPERATOR_CANCELLED;
+
+	/* create a brush and duplicate data */
+	newbrush = gpencil_brush_addnew(ts, brush->info, true);
+	newbrush->thickness = brush->thickness;
+	newbrush->draw_smoothfac = brush->draw_smoothfac;
+	newbrush->draw_smoothlvl = brush->draw_smoothlvl;
+	newbrush->sublevel = brush->sublevel;
+	newbrush->flag = brush->flag;
+	newbrush->draw_sensitivity = brush->draw_sensitivity;
+	newbrush->draw_strength = brush->draw_strength;
+	newbrush->draw_jitter = brush->draw_jitter;
+	newbrush->draw_angle = brush->draw_angle;
+	newbrush->draw_angle_factor = brush->draw_angle_factor;
+	newbrush->draw_random_press = brush->draw_random_press;
+	newbrush->draw_random_sub = brush->draw_random_sub;
+
+	/* free automatic curves created by default (replaced by copy) */
+	curvemapping_free(newbrush->cur_sensitivity);
+	curvemapping_free(newbrush->cur_strength);
+	curvemapping_free(newbrush->cur_jitter);
+
+	/* make a copy of curves */
+	newbrush->cur_sensitivity = curvemapping_copy(brush->cur_sensitivity);
+	newbrush->cur_strength = curvemapping_copy(brush->cur_strength);
+	newbrush->cur_jitter = curvemapping_copy(brush->cur_jitter);
+
+	gpencil_brush_setactive(ts, newbrush);
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_brush_copy(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Copy Brush";
+	ot->idname = "GPENCIL_OT_brush_copy";
+	ot->description = "Copy current Grease Pencil drawing brush";
+
+	/* callbacks */
+	ot->exec = gp_brush_copy_exec;
+	ot->poll = gp_active_brush_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+/* ***************** Select Brush ************************ */
+
+static int gp_brush_select_exec(bContext *C, wmOperator *op)
+{
+	ToolSettings *ts = CTX_data_tool_settings(C);
+
+	/* if there's no existing container */
+	if (ts == NULL) {
+		BKE_report(op->reports, RPT_ERROR, "Nowhere to go");
+		return OPERATOR_CANCELLED;
+	}
+
+	const int index = RNA_int_get(op->ptr, "index");
+	bGPDbrush *brush = BLI_findlink(&ts->gp_brushes, index);
+	/* sanity checks */
+	if (ELEM(NULL, brush)) {
+		return OPERATOR_CANCELLED;
+	}
+
+	gpencil_brush_setactive(ts, brush);
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_brush_select(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Select Brush";
+	ot->idname = "GPENCIL_OT_brush_select";
+	ot->description = "Select a Grease Pencil drawing brush";
+
+	/* callbacks */
+	ot->exec = gp_brush_select_exec;
+	ot->poll = gp_active_brush_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* properties */
+	RNA_def_int(ot->srna, "index", 0, 0, INT_MAX, "Index", "Index of Drawing Brush", 0, INT_MAX);
+}
+
+/* ************************************************ */
+/* Palette Operators */
+
+/* ******************* Add New Palette ************************ */
+
+/* add new palette - wrapper around API */
+static int gp_palette_add_exec(bContext *C, wmOperator *op)
+{
+	bGPdata **gpd_ptr = ED_gpencil_data_get_pointers(C, NULL);
+
+	/* if there's no existing Grease-Pencil data there, add some */
+	if (gpd_ptr == NULL) {
+		BKE_report(op->reports, RPT_ERROR, "Nowhere for grease pencil data to go");
+		return OPERATOR_CANCELLED;
+	}
+	if (*gpd_ptr == NULL)
+		*gpd_ptr = gpencil_data_addnew(DATA_("GPencil"));
+
+	/* add new palette now */
+	gpencil_palette_addnew(*gpd_ptr, DATA_("GP_Palette"), true);
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palette_add(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Add Palette";
+	ot->idname = "GPENCIL_OT_palette_add";
+	ot->description = "Add new Grease Pencil palette for the active Grease Pencil datablock";
+
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* callbacks */
+	ot->exec = gp_palette_add_exec;
+	ot->poll = gp_add_poll;
+}
+
+/* ******************* Remove Active Palette ************************* */
+
+static int gp_palette_remove_exec(bContext *C, wmOperator *op)
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette = gpencil_palette_getactive(gpd);
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd, palette))
+		return OPERATOR_CANCELLED;
+
+	if (BLI_listbase_count(&gpd->palettes) < 2) {
+		BKE_report(op->reports, RPT_ERROR, "Grease Pencil needs a palette. Unable to delete palette");
+		return OPERATOR_CANCELLED;
+	}
+
+
+	/* make the palette before this the new active palette
+	 * - use the one after if this is the first
+	 * - if this is the only palette, this naturally becomes NULL
+	 */
+	if (palette->prev)
+		gpencil_palette_setactive(gpd, palette->prev);
+	else
+		gpencil_palette_setactive(gpd, palette->next);
+
+	/* delete the palette now... */
+	gpencil_palette_delete(gpd, palette);
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palette_remove(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Remove palette";
+	ot->idname = "GPENCIL_OT_palette_remove";
+	ot->description = "Remove active Grease Pencil palette";
+
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* callbacks */
+	ot->exec = gp_palette_remove_exec;
+	ot->poll = gp_active_palette_poll;
+}
+
+/* ********************** Change Palette ***************************** */
+
+static int gp_palette_change_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(evt))
+{
+	uiPopupMenu *pup;
+	uiLayout *layout;
+
+	/* call the menu, which will call this operator again, hence the canceled */
+	pup = UI_popup_menu_begin(C, op->type->name, ICON_NONE);
+	layout = UI_popup_menu_layout(pup);
+	uiItemsEnumO(layout, "GPENCIL_OT_palette_change", "palette");
+	UI_popup_menu_end(C, pup);
+
+	return OPERATOR_INTERFACE;
+}
+
+static int gp_palette_change_exec(bContext *C, wmOperator *op)
+{
+	bGPdata *gpd = CTX_data_gpencil_data(C);
+	bGPDpalette *palette = NULL;
+	int palette_num = RNA_enum_get(op->ptr, "palette");
+
+	/* Get palette or create new one */
+	if (palette_num == -1) {
+		/* Create palette */
+		palette = gpencil_palette_addnew(gpd, DATA_("GP_Palette"), true);
+	}
+	else {
+		/* Try to get palette */
+		palette = BLI_findlink(&gpd->palettes, palette_num);
+
+		if (palette == NULL) {
+			BKE_reportf(op->reports, RPT_ERROR, "Cannot change to non-existent palette (index = %d)", palette_num);
+			return OPERATOR_CANCELLED;
+		}
+	}
+
+	/* Set active palette */
+	gpencil_palette_setactive(gpd, palette);
+
+	/* updates */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palette_change(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Change Palette";
+	ot->idname = "GPENCIL_OT_palette_change";
+	ot->description = "Change active Grease Pencil palette";
+
+	/* callbacks */
+	ot->invoke = gp_palette_change_invoke;
+	ot->exec = gp_palette_change_exec;
+	ot->poll = gp_active_palette_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* gp palette to use (dynamic enum) */
+	ot->prop = RNA_def_enum(ot->srna, "palette", DummyRNA_DEFAULT_items, 0, "Grease Pencil Palette", "");
+	RNA_def_enum_funcs(ot->prop, ED_gpencil_palettes_enum_itemf);
+}
+
+/* ******************* Lock and hide any color non used in current layer ************************** */
+
+static int gp_palette_lock_layer_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette;
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd))
+		return OPERATOR_CANCELLED;
+
+	palette = gpencil_palette_getactive(gpd);
+	if (ELEM(NULL, palette))
+		return OPERATOR_CANCELLED;
+
+	/* first lock and hide all colors */
+	for (bGPDpalettecolor *palcolor = palette->colors.first; palcolor; palcolor = palcolor->next) {
+		palcolor->flag |= PC_COLOR_LOCKED;
+		palcolor->flag |= PC_COLOR_HIDE;
+	}
+
+	/* loop all selected strokes and unlock any color used in active layer */
+	for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+		/* only editable and visible layers are considered */
+		if (gpencil_layer_is_editable(gpl) && (gpl->actframe != NULL) && (gpl->flag & GP_LAYER_ACTIVE)) {
+			for (bGPDstroke *gps = gpl->actframe->strokes.last; gps; gps = gps->prev) {
+				/* skip strokes that are invalid for current view */
+				if (ED_gpencil_stroke_can_use(C, gps) == false)
+					continue;
+
+				/* unlock/unhide color if not unlocked before */
+				if (gps->palcolor != NULL) {
+					gps->palcolor->flag &= ~PC_COLOR_LOCKED;
+					gps->palcolor->flag &= ~PC_COLOR_HIDE;
+				}
+			}
+		}
+	}
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palette_lock_layer(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Disable Unused Layer Colors";
+	ot->idname = "GPENCIL_OT_palette_lock_layer";
+	ot->description = "Lock and hide any color not used in any layer";
+
+	/* api callbacks */
+	ot->exec = gp_palette_lock_layer_exec;
+	ot->poll = gp_active_layer_poll;
+}
+
+/* ************************************************ */
+/* Palette Colors Operators */
+
+/* ******************* Add New Palette ************************ */
+
+/* add new palette - wrapper around API */
+static int gp_palettecolor_add_exec(bContext *C, wmOperator *op)
+{
+	bGPdata **gpd_ptr = ED_gpencil_data_get_pointers(C, NULL);
+
+	/* if there's no existing Grease-Pencil data there, add some */
+	if (gpd_ptr == NULL) {
+		BKE_report(op->reports, RPT_ERROR, "Nowhere for grease pencil data to go");
+		return OPERATOR_CANCELLED;
+	}
+	if (*gpd_ptr == NULL)
+		*gpd_ptr = gpencil_data_addnew(DATA_("GPencil"));
+
+	/* verify palette */
+	bGPDpalette *palette = gpencil_palette_getactive(*gpd_ptr);
+	if (palette == NULL)
+		palette = gpencil_palette_addnew(*gpd_ptr, DATA_("GP_Palette"), true);
+
+	/* add new palette color now */
+	gpencil_palettecolor_addnew(palette, DATA_("Color"), true);
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palettecolor_add(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Add Palette Color";
+	ot->idname = "GPENCIL_OT_palettecolor_add";
+	ot->description = "Add new Grease Pencil palette color for the active Grease Pencil datablock";
+
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* callbacks */
+	ot->exec = gp_palettecolor_add_exec;
+	ot->poll = gp_add_poll;
+}
+
+/* ******************* Remove Active Palette color ************************* */
+
+static int gp_palettecolor_remove_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette = gpencil_palette_getactive(gpd);
+	bGPDpalettecolor *color = gpencil_palettecolor_getactive(palette);
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd, palette, color))
+		return OPERATOR_CANCELLED;
+
+	/* make the palette color before this the new active color
+	 * - use the one after if this is the first
+	 * - if this is the only color, this naturally becomes NULL
+	 */
+	if (color->prev)
+		gpencil_palettecolor_setactive(palette, color->prev);
+	else
+		gpencil_palettecolor_setactive(palette, color->next);
+
+	/* delete the strokes */
+	gpencil_palettecolor_delete_strokes(gpd, color->info);
+
+	/* delete the palette color now... */
+	gpencil_palettecolor_delete(palette, color);
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palettecolor_remove(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Remove palette color";
+	ot->idname = "GPENCIL_OT_palettecolor_remove";
+	ot->description = "Remove active Grease Pencil palette color";
+
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* callbacks */
+	ot->exec = gp_palettecolor_remove_exec;
+	ot->poll = gp_active_palettecolor_poll;
+}
+
+/* ********************** Isolate palette color **************************** */
+
+static int gp_isolate_palettecolor_exec(bContext *C, wmOperator *op)
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette = gpencil_palette_getactive(gpd);
+	bGPDpalettecolor *active_color = gpencil_palettecolor_getactive(palette);
+	bGPDpalettecolor *palcolor;
+
+	int flags = PC_COLOR_LOCKED;
+	bool isolate = false;
+
+	if (RNA_boolean_get(op->ptr, "affect_visibility"))
+		flags |= PC_COLOR_HIDE;
+
+	if (ELEM(NULL, gpd, active_color)) {
+		BKE_report(op->reports, RPT_ERROR, "No active color to isolate");
+		return OPERATOR_CANCELLED;
+	}
+
+	/* Test whether to isolate or clear all flags */
+	for (palcolor = palette->colors.first; palcolor; palcolor = palcolor->next) {
+		/* Skip if this is the active one */
+		if (palcolor == active_color)
+			continue;
+
+		/* If the flags aren't set, that means that the color is
+		 * not alone, so we have some colors to isolate still
+		 */
+		if ((palcolor->flag & flags) == 0) {
+			isolate = true;
+			break;
+		}
+	}
+
+	/* Set/Clear flags as appropriate */
+	if (isolate) {
+		/* Set flags on all "other" colors */
+		for (palcolor = palette->colors.first; palcolor; palcolor = palcolor->next) {
+			if (palcolor == active_color)
+				continue;
+			else
+				palcolor->flag |= flags;
+		}
+	}
+	else {
+		/* Clear flags - Restore everything else */
+		for (palcolor = palette->colors.first; palcolor; palcolor = palcolor->next) {
+			palcolor->flag &= ~flags;
+		}
+	}
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palettecolor_isolate(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Isolate Palette Color";
+	ot->idname = "GPENCIL_OT_palettecolor_isolate";
+	ot->description = "Toggle whether the active color is the only one that is editable and/or visible";
+
+	/* callbacks */
+	ot->exec = gp_isolate_palettecolor_exec;
+	ot->poll = gp_active_palettecolor_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* properties */
+	RNA_def_boolean(ot->srna, "affect_visibility", false, "Affect Visibility", "In addition to toggling "
+	                "the editability, also affect the visibility");
+}
+
+/* *********************** Hide Palette colors ******************************** */
+
+static int gp_palettecolor_hide_exec(bContext *C, wmOperator *op)
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette = gpencil_palette_getactive(gpd);
+	bGPDpalettecolor *palcolor = gpencil_palettecolor_getactive(palette);
+
+	bool unselected = RNA_boolean_get(op->ptr, "unselected");
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd, palette, palcolor))
+		return OPERATOR_CANCELLED;
+
+	if (unselected) {
+		bGPDpalettecolor *color;
+
+		/* hide unselected */
+		for (color = palette->colors.first; color; color = color->next) {
+			if (color != palcolor) {
+				color->flag |= PC_COLOR_HIDE;
+			}
+		}
+	}
+	else {
+		/* hide selected/active */
+		palcolor->flag |= PC_COLOR_HIDE;
+	}
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palettecolor_hide(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Hide Color(s)";
+	ot->idname = "GPENCIL_OT_palettecolor_hide";
+	ot->description = "Hide selected/unselected Grease Pencil colors";
+
+	/* callbacks */
+	ot->exec = gp_palettecolor_hide_exec;
+	ot->poll = gp_active_palettecolor_poll; /* NOTE: we need an active color to play with */
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* props */
+	RNA_def_boolean(ot->srna, "unselected", 0, "Unselected", "Hide unselected rather than selected colors");
+}
+
+/* ********************** Show All Colors ***************************** */
+
+/* poll callback for showing colors */
+static int gp_palettecolor_reveal_poll(bContext *C)
+{
+	return ED_gpencil_data_get_active(C) != NULL;
+}
+
+static int gp_palettecolor_reveal_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette = gpencil_palette_getactive(gpd);
+	bGPDpalettecolor *palcolor;
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd, palette))
+		return OPERATOR_CANCELLED;
+
+	/* make all colors visible */
+	for (palcolor = palette->colors.first; palcolor; palcolor = palcolor->next) {
+		palcolor->flag &= ~PC_COLOR_HIDE;
+	}
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palettecolor_reveal(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Show All Colors";
+	ot->idname = "GPENCIL_OT_palettecolor_reveal";
+	ot->description = "Unhide all hidden Grease Pencil palette colors";
+
+	/* callbacks */
+	ot->exec = gp_palettecolor_reveal_exec;
+	ot->poll = gp_palettecolor_reveal_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+/* ***************** Lock/Unlock All Palette colors ************************ */
+
+static int gp_palettecolor_lock_all_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette = gpencil_palette_getactive(gpd);
+	bGPDpalettecolor *palcolor;
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd, palette))
+		return OPERATOR_CANCELLED;
+
+	/* make all layers non-editable */
+	for (palcolor = palette->colors.first; palcolor; palcolor = palcolor->next) {
+		palcolor->flag |= PC_COLOR_LOCKED;
+	}
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palettecolor_lock_all(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Lock All Colors";
+	ot->idname = "GPENCIL_OT_palettecolor_lock_all";
+	ot->description = "Lock all Grease Pencil colors to prevent them from being accidentally modified";
+
+	/* callbacks */
+	ot->exec = gp_palettecolor_lock_all_exec;
+	ot->poll = gp_palettecolor_reveal_poll; /* XXX: could use dedicated poll later */
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+/* -------------------------- */
+
+static int gp_palettecolor_unlock_all_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette = gpencil_palette_getactive(gpd);
+	bGPDpalettecolor *palcolor;
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd, palette))
+		return OPERATOR_CANCELLED;
+
+	/* make all layers editable again*/
+	for (palcolor = palette->colors.first; palcolor; palcolor = palcolor->next) {
+		palcolor->flag &= ~PC_COLOR_LOCKED;
+	}
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palettecolor_unlock_all(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Unlock All Colors";
+	ot->idname = "GPENCIL_OT_palettecolor_unlock_all";
+	ot->description = "Unlock all Grease Pencil colors so that they can be edited";
+
+	/* callbacks */
+	ot->exec = gp_palettecolor_unlock_all_exec;
+	ot->poll = gp_palettecolor_reveal_poll; /* XXX: could use dedicated poll later */
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+/* ******************* Move Color Up/Down ************************** */
+
+enum {
+	GP_COLOR_MOVE_UP = -1,
+	GP_COLOR_MOVE_DOWN = 1
+};
+
+static int gp_palettecolor_move_exec(bContext *C, wmOperator *op)
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette = gpencil_palette_getactive(gpd);
+	bGPDpalettecolor *palcolor = gpencil_palettecolor_getactive(palette);
+
+	int direction = RNA_enum_get(op->ptr, "direction");
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd, palette, palcolor))
+		return OPERATOR_CANCELLED;
+
+	/* up or down? */
+	if (direction == GP_COLOR_MOVE_UP) {
+		/* up */
+		BLI_remlink(&palette->colors, palcolor);
+		BLI_insertlinkbefore(&palette->colors, palcolor->prev, palcolor);
+	}
+	else if (direction == GP_COLOR_MOVE_DOWN) {
+		/* down */
+		BLI_remlink(&palette->colors, palcolor);
+		BLI_insertlinkafter(&palette->colors, palcolor->next, palcolor);
+	}
+	else {
+		BLI_assert(0);
+	}
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palettecolor_move(wmOperatorType *ot)
+{
+	static EnumPropertyItem slot_move[] = {
+		{GP_COLOR_MOVE_UP, "UP", 0, "Up", ""},
+		{GP_COLOR_MOVE_DOWN, "DOWN", 0, "Down", ""},
+		{0, NULL, 0, NULL, NULL}
+	};
+
+	/* identifiers */
+	ot->name = "Move Palette color";
+	ot->idname = "GPENCIL_OT_palettecolor_move";
+	ot->description = "Move the active Grease Pencil palette color up/down in the list";
+
+	/* api callbacks */
+	ot->exec = gp_palettecolor_move_exec;
+	ot->poll = gp_palettecolor_reveal_poll; /* XXX: could use dedicated poll later */
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	ot->prop = RNA_def_enum(ot->srna, "direction", slot_move, GP_COLOR_MOVE_UP, "Direction", "");
+}
+
+/* ***************** Select all strokes using Palette color ************************ */
+
+static int gp_palettecolor_select_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette = gpencil_palette_getactive(gpd);
+	bGPDpalettecolor *palcolor = gpencil_palettecolor_getactive(palette);
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd, palette, palcolor))
+		return OPERATOR_CANCELLED;
+
+	/* read all strokes and select*/
+	for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+		/* only editable and visible layers are considered */
+		if (gpencil_layer_is_editable(gpl) && (gpl->actframe != NULL)) {
+			/* verify something to do */
+			for (bGPDstroke *gps = gpl->actframe->strokes.first; gps; gps = gps->next) {
+				/* skip strokes that are invalid for current view */
+				if (ED_gpencil_stroke_can_use(C, gps) == false)
+					continue;
+				/* check if the color is editable */
+				if (ED_gpencil_stroke_color_use(gpl, gps) == false)
+					continue;
+
+				/* select */
+				if (strcmp(palcolor->info, gps->colorname) == 0) {
+					bGPDspoint *pt;
+					int i;
+
+					gps->flag |= GP_STROKE_SELECT;
+					for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
+						pt->flag |= GP_SPOINT_SELECT;
+					}
+				}
+			}
+		}
+	}
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palettecolor_select(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Select Color";
+	ot->idname = "GPENCIL_OT_palettecolor_select";
+	ot->description = "Select all Grease Pencil strokes using current color";
+
+	/* callbacks */
+	ot->exec = gp_palettecolor_select_exec;
+	ot->poll = gp_palettecolor_reveal_poll; /* XXX: could use dedicated poll later */
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+/* ***************** Copy Palette color ************************ */
+
+static int gp_palettecolor_copy_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette = gpencil_palette_getactive(gpd);
+	bGPDpalettecolor *palcolor = gpencil_palettecolor_getactive(palette);
+	bGPDpalettecolor *newcolor;
+
+	/* sanity checks */
+	if (ELEM(NULL, gpd, palette, palcolor))
+		return OPERATOR_CANCELLED;
+
+	/* create a new color and duplicate data */
+	newcolor = gpencil_palettecolor_addnew(palette, palcolor->info, true);
+	copy_v4_v4(newcolor->color, palcolor->color);
+	copy_v4_v4(newcolor->fill, palcolor->fill);
+	newcolor->flag = palcolor->flag;
+
+	/* notifiers */
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_palettecolor_copy(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Copy Color";
+	ot->idname = "GPENCIL_OT_palettecolor_copy";
+	ot->description = "Copy current Grease Pencil palette color";
+
+	/* callbacks */
+	ot->exec = gp_palettecolor_copy_exec;
+	ot->poll = gp_active_palettecolor_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
diff --git a/source/blender/editors/gpencil/gpencil_edit.c b/source/blender/editors/gpencil/gpencil_edit.c
index ac49a51c716..621ebea6603 100644
--- a/source/blender/editors/gpencil/gpencil_edit.c
+++ b/source/blender/editors/gpencil/gpencil_edit.c
@@ -125,10 +125,48 @@ static int gp_stroke_edit_poll(bContext *C)
 	return CTX_DATA_COUNT(C, editable_gpencil_strokes) != 0;
 }
 
+/* ************ Stroke Hide selection Toggle ************** */
+
+static int gpencil_hideselect_toggle_exec(bContext *C, wmOperator *UNUSED(op))
+{
+	ToolSettings *ts = CTX_data_tool_settings(C);
+
+	if (ts == NULL)
+		return OPERATOR_CANCELLED;
+
+	/* Just toggle alpha... */
+	if (ts->gp_sculpt.alpha > 0.0f) {
+		ts->gp_sculpt.alpha = 0.0f;
+	}
+	else {
+		ts->gp_sculpt.alpha = 1.0f;
+	}
+
+	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | ND_GPENCIL_EDITMODE, NULL);
+	WM_event_add_notifier(C, NC_SCENE | ND_MODE, NULL);
+
+	return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_selection_opacity_toggle(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Hide Selection";
+	ot->idname = "GPENCIL_OT_selection_opacity_toggle";
+	ot->description = "Hide/Unhide selected points for Grease Pencil strokes setting alpha factor";
+
+	/* callbacks */
+	ot->exec = gpencil_hideselect_toggle_exec;
+	ot->poll = gp_stroke_edit_poll;
+
+	/* flags */
+	ot->flag = OPTYPE_UNDO | OPTYPE_REGISTER;
+}
+
 /* ************** Duplicate Selected Strokes **************** */
 
 /* Make copies of selected point segments in a selected stroke */
-static void gp_duplicate_points(const bGPDstroke *gps, ListBase *new_strokes)
+static void gp_duplicate_points(const bGPDstroke *gps, ListBase *new_strokes, const char *layername)
 {
 	bGPDspoint *pt;
 	int i;
@@ -169,6 +207,7 @@ static void gp_duplicate_points(const bGPDstroke *gps, ListBase *new_strokes)
 				
 				/* make a stupid copy first of the entire stroke (to get the flags too) */
 				gpsd = MEM_dupallocN(gps);
+				strcpy(gpsd->tmp_layerinfo, layername); /* saves original layer name */
 				
 				/* initialize triangle memory - will be calculated on next redraw */
 				gpsd->triangles = NULL;
@@ -216,8 +255,9 @@ static int gp_duplicate_exec(bContext *C, wmOperator *op)
 		/* make copies of selected strokes, and deselect these once we're done */
 		for (gps = gpf->strokes.first; gps; gps = gps->next) {
 			/* skip strokes that are invalid for current view */
-			if (ED_gpencil_stroke_can_use(C, gps) == false)
+			if (ED_gpencil_stroke_can_use(C, gps) == false) {
 				continue;
+			}
 			
 			if (gps->flag & GP_STROKE_SELECT) {
 				if (gps->totpoints == 1) {
@@ -226,8 +266,9 @@ static int gp_duplicate_exec(bContext *C, wmOperator *op)
 					
 					/* make direct copies of the stroke and its points */
 					gpsd = MEM_dupallocN(gps);
+					strcpy(gpsd->tmp_layerinfo, gpl->info);
 					gpsd->points = MEM_dupallocN(gps->points);
-					
+
 					/* triangle information - will be calculated on next redraw */
 					gpsd->flag |= GP_STROKE_RECALC_CACHES;
 					gpsd->triangles = NULL;
@@ -238,7 +279,7 @@ static int gp_duplicate_exec(bContext *C, wmOperator *op)
 				}
 				else {
 					/* delegate to a helper, as there's too much to fit in here (for copying subsets)... */
-					gp_duplicate_points(gps, &new_strokes);
+					gp_duplicate_points(gps, &new_strokes, gpl->info);
 				}
 				
 				/* deselect original stroke, or else the originals get moved too
@@ -345,6 +386,7 @@ static int gp_strokes_copy_exec(bContext *C, wmOperator *op)
 					
 					/* make direct copies of the stroke and its points */
 					gpsd = MEM_dupallocN(gps);
+					strcpy(gpsd->tmp_layerinfo, gpl->info); /* saves original layer name */
 					gpsd->points = MEM_dupallocN(gps->points);
 					
 					/* triangles cache - will be recalculated on next redraw */
@@ -358,7 +400,7 @@ static int gp_strokes_copy_exec(bContext *C, wmOperator *op)
 				}
 				else {
 					/* delegate to a helper, as there's too much to fit in here (for copying subsets)... */
-					gp_duplicate_points(gps, &gp_strokes_copypastebuf);
+					gp_duplicate_points(gps, &gp_strokes_copypastebuf, gpl->info);
 				}
 			}
 		}
@@ -395,13 +437,20 @@ static int gp_strokes_paste_poll(bContext *C)
 	return (CTX_data_active_gpencil_layer(C) != NULL) && (!BLI_listbase_is_empty(&gp_strokes_copypastebuf));
 }
 
+enum {
+	GP_COPY_ONLY = -1,
+	GP_COPY_MERGE = 1
+};
+
 static int gp_strokes_paste_exec(bContext *C, wmOperator *op)
 {
 	Scene *scene = CTX_data_scene(C);
 	bGPdata *gpd = ED_gpencil_data_get_active(C);
-	bGPDlayer *gpl = CTX_data_active_gpencil_layer(C);
+	bGPDlayer *gpl = CTX_data_active_gpencil_layer(C); /* only use active for copy merge */
 	bGPDframe *gpf;
-	
+
+	int type = RNA_enum_get(op->ptr, "type");
+
 	/* check for various error conditions */
 	if (gpd == NULL) {
 		BKE_report(op->reports, RPT_ERROR, "No Grease Pencil data");
@@ -415,7 +464,7 @@ static int gp_strokes_paste_exec(bContext *C, wmOperator *op)
 		/* no active layer - let's just create one */
 		gpl = gpencil_layer_addnew(gpd, DATA_("GP_Layer"), true);
 	}
-	else if (gpencil_layer_is_editable(gpl) == false) {
+	else if ((gpencil_layer_is_editable(gpl) == false) && (type == GP_COPY_MERGE)) {
 		BKE_report(op->reports, RPT_ERROR, "Can not paste strokes when active layer is hidden or locked");
 		return OPERATOR_CANCELLED;
 	}
@@ -463,26 +512,34 @@ static int gp_strokes_paste_exec(bContext *C, wmOperator *op)
 	 *       we are obliged to add a new frame if one
 	 *       doesn't exist already
 	 */
-	gpf = gpencil_layer_getframe(gpl, CFRA, true);
 	
-	if (gpf) {
 		bGPDstroke *gps;
-		
 		/* Copy each stroke into the layer */
 		for (gps = gp_strokes_copypastebuf.first; gps; gps = gps->next) {
 			if (ED_gpencil_stroke_can_use(C, gps)) {
-				bGPDstroke *new_stroke = MEM_dupallocN(gps);
-				
-				new_stroke->points = MEM_dupallocN(gps->points);
-				
-				new_stroke->flag |= GP_STROKE_RECALC_CACHES;
-				new_stroke->triangles = NULL;
-				
-				new_stroke->next = new_stroke->prev = NULL;
-				BLI_addtail(&gpf->strokes, new_stroke);
+				/* need to verify if layer exist nad frame */
+				if (type != GP_COPY_MERGE) {
+					gpl = BLI_findstring(&gpd->layers, gps->tmp_layerinfo, offsetof(bGPDlayer, info));
+					if (gpl == NULL) {
+						/* no layer - use active (only if layer deleted before paste) */
+						gpl = CTX_data_active_gpencil_layer(C);
+					}
+				}
+				gpf = gpencil_layer_getframe(gpl, CFRA, true);
+				if (gpf) {
+					bGPDstroke *new_stroke = MEM_dupallocN(gps);
+					new_stroke->tmp_layerinfo[0] = '\0';
+
+					new_stroke->points = MEM_dupallocN(gps->points);
+
+					new_stroke->flag |= GP_STROKE_RECALC_CACHES;
+					new_stroke->triangles = NULL;
+
+					new_stroke->next = new_stroke->prev = NULL;
+					BLI_addtail(&gpf->strokes, new_stroke);
+				}
 			}
 		}
-	}
 	
 	/* updates */
 	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
@@ -492,10 +549,16 @@ static int gp_strokes_paste_exec(bContext *C, wmOperator *op)
 
 void GPENCIL_OT_paste(wmOperatorType *ot)
 {
+	static EnumPropertyItem copy_type[] = {
+		{GP_COPY_ONLY, "COPY", 0, "Copy", ""},
+		{GP_COPY_MERGE, "MERGE", 0, "Merge", ""},
+		{0, NULL, 0, NULL, NULL}
+	};
+
 	/* identifiers */
 	ot->name = "Paste Strokes";
 	ot->idname = "GPENCIL_OT_paste";
-	ot->description = "Paste previously copied strokes into active layer";
+	ot->description = "Paste previously copied strokes or copy and merge in active layer";
 	
 	/* callbacks */
 	ot->exec = gp_strokes_paste_exec;
@@ -503,6 +566,8 @@ void GPENCIL_OT_paste(wmOperatorType *ot)
 	
 	/* flags */
 	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	ot->prop = RNA_def_enum(ot->srna, "type", copy_type, 0, "Type", "");
 }
 
 /* ******************* Move To Layer ****************************** */
@@ -1069,7 +1134,7 @@ void GPENCIL_OT_delete(wmOperatorType *ot)
 	};
 	
 	/* identifiers */
-	ot->name = "Delete...";
+	ot->name = "Delete";
 	ot->idname = "GPENCIL_OT_delete";
 	ot->description = "Delete selected Grease Pencil strokes, vertices, or frames";
 	
@@ -1124,25 +1189,65 @@ static int gp_snap_poll(bContext *C)
 static int gp_snap_to_grid(bContext *C, wmOperator *UNUSED(op))
 {
 	RegionView3D *rv3d = CTX_wm_region_data(C);
-	float gridf = rv3d->gridview;
+	const float gridf = rv3d->gridview;
 	
-	CTX_DATA_BEGIN(C, bGPDstroke *, gps, editable_gpencil_strokes)
-	{
-		bGPDspoint *pt;
-		int i;
-		
-		// TOOD: if entire stroke is selected, offset entire stroke by same amount?
-		
-		for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
-			/* only if point is selected.. */
-			if (pt->flag & GP_SPOINT_SELECT) {
-				pt->x = gridf * floorf(0.5f + pt->x / gridf);
-				pt->y = gridf * floorf(0.5f + pt->y / gridf);
-				pt->z = gridf * floorf(0.5f + pt->z / gridf);
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	float diff_mat[4][4];
+
+	for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+		/* only editable and visible layers are considered */
+		if (gpencil_layer_is_editable(gpl) && (gpl->actframe != NULL)) {
+
+			/* calculate difference matrix if parent object */
+			if (gpl->parent != NULL) {
+				ED_gpencil_parent_location(gpl, diff_mat);
+			}
+
+			bGPDframe *gpf = gpl->actframe;
+			bGPDstroke *gps;
+			for (gps = gpf->strokes.first; gps; gps = gps->next) {
+				/* skip strokes that are invalid for current view */
+				if (ED_gpencil_stroke_can_use(C, gps) == false)
+					continue;
+				/* check if the color is editable */
+				if (ED_gpencil_stroke_color_use(gpl, gps) == false) {
+					continue;
+				}
+
+				bGPDspoint *pt;
+				int i;
+
+				// TOOD: if entire stroke is selected, offset entire stroke by same amount?
+
+				for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
+
+					/* only if point is selected.. */
+					if (pt->flag & GP_SPOINT_SELECT) {
+						if (gpl->parent == NULL) {
+							pt->x = gridf * floorf(0.5f + pt->x / gridf);
+							pt->y = gridf * floorf(0.5f + pt->y / gridf);
+							pt->z = gridf * floorf(0.5f + pt->z / gridf);
+						}
+						else {
+							/* apply parent transformations */
+							float fpt[3];
+							mul_v3_m4v3(fpt, diff_mat, &pt->x);
+
+							fpt[0] = gridf * floorf(0.5f + fpt[0] / gridf);
+							fpt[1] = gridf * floorf(0.5f + fpt[1] / gridf);
+							fpt[2] = gridf * floorf(0.5f + fpt[2] / gridf);
+
+							/* return data */
+							copy_v3_v3(&pt->x, fpt);
+							gp_apply_parent_point(gpl, pt);
+						}
+
+					}
+				}
+
 			}
 		}
 	}
-	CTX_DATA_END;
 	
 	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
 	return OPERATOR_FINISHED;
@@ -1169,41 +1274,68 @@ static int gp_snap_to_cursor(bContext *C, wmOperator *op)
 {
 	Scene *scene = CTX_data_scene(C);
 	View3D *v3d = CTX_wm_view3d(C);
-	
+
 	const bool use_offset = RNA_boolean_get(op->ptr, "use_offset");
 	const float *cursor_global = ED_view3d_cursor3d_get(scene, v3d);
-	
-	CTX_DATA_BEGIN(C, bGPDstroke *, gps, editable_gpencil_strokes)
-	{
-		bGPDspoint *pt;
-		int i;
-		
-		/* only continue if this stroke is selected (editable doesn't guarantee this)... */
-		if ((gps->flag & GP_STROKE_SELECT) == 0)
-			continue;
-		
-		if (use_offset) {
-			float offset[3];
-			
-			/* compute offset from first point of stroke to cursor */
-			/* TODO: Allow using midpoint instead? */
-			sub_v3_v3v3(offset, cursor_global, &gps->points->x);
-			
-			/* apply offset to all points in the stroke */
-			for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
-				add_v3_v3(&pt->x, offset);
+
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	float diff_mat[4][4];
+
+	for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+		/* only editable and visible layers are considered */
+		if (gpencil_layer_is_editable(gpl) && (gpl->actframe != NULL)) {
+
+			/* calculate difference matrix if parent object */
+			if (gpl->parent != NULL) {
+				ED_gpencil_parent_location(gpl, diff_mat);
 			}
-		}
-		else {
-			/* affect each selected point */
-			for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
-				if (pt->flag & GP_SPOINT_SELECT) {
-					copy_v3_v3(&pt->x, cursor_global);
+
+			bGPDframe *gpf = gpl->actframe;
+			bGPDstroke *gps;
+			for (gps = gpf->strokes.first; gps; gps = gps->next) {
+				/* skip strokes that are invalid for current view */
+				if (ED_gpencil_stroke_can_use(C, gps) == false)
+					continue;
+				/* check if the color is editable */
+				if (ED_gpencil_stroke_color_use(gpl, gps) == false) {
+					continue;
+				}
+
+				bGPDspoint *pt;
+				int i;
+
+				/* only continue if this stroke is selected (editable doesn't guarantee this)... */
+				if ((gps->flag & GP_STROKE_SELECT) == 0)
+					continue;
+
+				if (use_offset) {
+					float offset[3];
+
+					/* compute offset from first point of stroke to cursor */
+					/* TODO: Allow using midpoint instead? */
+					sub_v3_v3v3(offset, cursor_global, &gps->points->x);
+
+					/* apply offset to all points in the stroke */
+					for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
+						add_v3_v3(&pt->x, offset);
+					}
+				}
+				else {
+					/* affect each selected point */
+					for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
+						if (pt->flag & GP_SPOINT_SELECT) {
+							copy_v3_v3(&pt->x, cursor_global);
+							if (gpl->parent != NULL) {
+								gp_apply_parent_point(gpl, pt);
+							}
+						}
+					}
 				}
+
+
 			}
 		}
 	}
-	CTX_DATA_END;
 	
 	WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
 	return OPERATOR_FINISHED;
@@ -1243,24 +1375,57 @@ static int gp_snap_cursor_to_sel(bContext *C, wmOperator *UNUSED(op))
 	INIT_MINMAX(min, max);
 	
 	/* calculate midpoints from selected points */
-	CTX_DATA_BEGIN(C, bGPDstroke *, gps, editable_gpencil_strokes)
-	{
-		bGPDspoint *pt;
-		int i;
-		
-		/* only continue if this stroke is selected (editable doesn't guarantee this)... */
-		if ((gps->flag & GP_STROKE_SELECT) == 0)
-			continue;
-		
-		for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
-			if (pt->flag & GP_SPOINT_SELECT) {
-				add_v3_v3(centroid, &pt->x);
-				minmax_v3v3_v3(min, max, &pt->x);
-				count++;
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	float diff_mat[4][4];
+
+	for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+		/* only editable and visible layers are considered */
+		if (gpencil_layer_is_editable(gpl) && (gpl->actframe != NULL)) {
+
+			/* calculate difference matrix if parent object */
+			if (gpl->parent != NULL) {
+				ED_gpencil_parent_location(gpl, diff_mat);
+			}
+
+			bGPDframe *gpf = gpl->actframe;
+			bGPDstroke *gps;
+			for (gps = gpf->strokes.first; gps; gps = gps->next) {
+				/* skip strokes that are invalid for current view */
+				if (ED_gpencil_stroke_can_use(C, gps) == false)
+					continue;
+				/* check if the color is editable */
+				if (ED_gpencil_stroke_color_use(gpl, gps) == false) {
+					continue;
+				}
+
+				bGPDspoint *pt;
+				int i;
+
+				/* only continue if this stroke is selected (editable doesn't guarantee this)... */
+				if ((gps->flag & GP_STROKE_SELECT) == 0)
+					continue;
+
+				for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
+					if (pt->flag & GP_SPOINT_SELECT) {
+						if (gpl->parent == NULL) {
+							add_v3_v3(centroid, &pt->x);
+							minmax_v3v3_v3(min, max, &pt->x);
+						}
+						else {
+							/* apply parent transformations */
+							float fpt[3];
+							mul_v3_m4v3(fpt, diff_mat, &pt->x);
+
+							add_v3_v3(centroid, fpt);
+							minmax_v3v3_v3(min, max, fpt);
+						}
+						count++;
+					}
+				}
+
 			}
 		}
 	}
-	CTX_DATA_END;
 	
 	if (v3d->around == V3D_AROUND_CENTER_MEAN && count) {
 		mul_v3_fl(centroid, 1.0f / (float)count);
diff --git a/source/blender/editors/gpencil/gpencil_intern.h b/source/blender/editors/gpencil/gpencil_intern.h
index 53fb33eeb9b..0ff0878d4ce 100644
--- a/source/blender/editors/gpencil/gpencil_intern.h
+++ b/source/blender/editors/gpencil/gpencil_intern.h
@@ -101,6 +101,23 @@ void gp_point_to_xy(GP_SpaceConversion *settings, struct bGPDstroke *gps, struct
                     int *r_x, int *r_y);
 
 /**
+ * Convert point to parent space
+ *
+ * \param pt         Original point
+ * \param diff_mat   Matrix with the difference between original parent matrix
+ * \param[out] r_pt  Pointer to new point after apply matrix
+ */
+void gp_point_to_parent_space(bGPDspoint *pt, float diff_mat[4][4], bGPDspoint *r_pt);
+/**
+ * Change points position relative to parent object
+ */
+void gp_apply_parent(bGPDlayer *gpl, bGPDstroke *gps);
+/**
+ * Change point position relative to parent object
+ */
+void gp_apply_parent_point(bGPDlayer *gpl, bGPDspoint *pt);
+
+/**
  * Convert a screenspace point to a 3D Grease Pencil coordinate.
  *
  * For use with editing tools where it is easier to perform the operations in 2D,
@@ -116,6 +133,10 @@ bool gp_point_xy_to_3d(GP_SpaceConversion *gsc, struct Scene *scene, const float
 
 int gp_add_poll(struct bContext *C);
 int gp_active_layer_poll(struct bContext *C);
+int gp_active_brush_poll(struct bContext *C);
+int gp_active_palette_poll(struct bContext *C);
+int gp_active_palettecolor_poll(struct bContext *C);
+int gp_brush_crt_presets_poll(bContext *C);
 
 /* Copy/Paste Buffer --------------------------------- */
 /* gpencil_edit.c */
@@ -137,17 +158,47 @@ void gp_stroke_delete_tagged_points(bGPDframe *gpf, bGPDstroke *gps, bGPDstroke
 bool gp_smooth_stroke(bGPDstroke *gps, int i, float inf, bool affect_pressure);
 
 /**
+* Apply smooth for strength to stroke point
+* \param gps              Stroke to smooth
+* \param i                Point index
+* \param inf              Amount of smoothing to apply
+*/
+bool gp_smooth_stroke_strength(bGPDstroke *gps, int i, float inf);
+
+/**
+* Apply smooth for thickness to stroke point (use pressure)
+* \param gps              Stroke to smooth
+* \param i                Point index
+* \param inf              Amount of smoothing to apply
+*/
+bool gp_smooth_stroke_thickness(bGPDstroke *gps, int i, float inf);
+
+/**
  * Subdivide a stroke once, by adding points at the midpoint between each pair of points
  * \param gps           Stroke data
  * \param new_totpoints Total number of points (after subdividing)
  */
 void gp_subdivide_stroke(bGPDstroke *gps, const int new_totpoints);
 
+/**
+* Add randomness to stroke
+* \param gps           Stroke data
+* \param brsuh         Brush data
+*/
+void gp_randomize_stroke(bGPDstroke *gps, bGPDbrush *brush);
+
 /* Layers Enums -------------------------------------- */
 
 struct EnumPropertyItem *ED_gpencil_layers_enum_itemf(struct bContext *C, struct PointerRNA *ptr, struct PropertyRNA *prop, bool *r_free);
 struct EnumPropertyItem *ED_gpencil_layers_with_new_enum_itemf(struct bContext *C, struct PointerRNA *ptr, struct PropertyRNA *prop, bool *r_free);
 
+/* Enums of GP Brushes */
+EnumPropertyItem *ED_gpencil_brushes_enum_itemf(bContext *C, PointerRNA *UNUSED(ptr), PropertyRNA *UNUSED(prop),
+                                                bool *r_free);
+
+/* Enums of GP palettes */
+EnumPropertyItem *ED_gpencil_palettes_enum_itemf(bContext *C, PointerRNA *UNUSED(ptr), PropertyRNA *UNUSED(prop),
+                                                 bool *r_free);
 /* ***************************************************** */
 /* Operator Defines */
 
@@ -166,6 +217,7 @@ typedef enum eGPencil_PaintModes {
 /* stroke editing ----- */
 
 void GPENCIL_OT_editmode_toggle(struct wmOperatorType *ot);
+void GPENCIL_OT_selection_opacity_toggle(struct wmOperatorType *ot);
 
 void GPENCIL_OT_select(struct wmOperatorType *ot);
 void GPENCIL_OT_select_all(struct wmOperatorType *ot);
@@ -216,12 +268,45 @@ void GPENCIL_OT_lock_all(struct wmOperatorType *ot);
 void GPENCIL_OT_unlock_all(struct wmOperatorType *ot);
 
 void GPENCIL_OT_layer_isolate(struct wmOperatorType *ot);
+void GPENCIL_OT_layer_merge(struct wmOperatorType *ot);
 
 void GPENCIL_OT_active_frame_delete(struct wmOperatorType *ot);
 void GPENCIL_OT_active_frames_delete_all(struct wmOperatorType *ot);
 
 void GPENCIL_OT_convert(struct wmOperatorType *ot);
 
+void GPENCIL_OT_stroke_arrange(struct wmOperatorType *ot);
+void GPENCIL_OT_stroke_change_color(struct wmOperatorType *ot);
+void GPENCIL_OT_stroke_lock_color(struct wmOperatorType *ot);
+void GPENCIL_OT_stroke_apply_thickness(struct wmOperatorType *ot);
+void GPENCIL_OT_stroke_cyclical_set(struct wmOperatorType *ot);
+void GPENCIL_OT_stroke_join(struct wmOperatorType *ot);
+void GPENCIL_OT_stroke_flip(struct wmOperatorType *ot);
+
+void GPENCIL_OT_brush_add(struct wmOperatorType *ot);
+void GPENCIL_OT_brush_remove(struct wmOperatorType *ot);
+void GPENCIL_OT_brush_change(struct wmOperatorType *ot);
+void GPENCIL_OT_brush_move(struct wmOperatorType *ot);
+void GPENCIL_OT_brush_presets_create(struct wmOperatorType *ot);
+void GPENCIL_OT_brush_copy(struct wmOperatorType *ot);
+void GPENCIL_OT_brush_select(struct wmOperatorType *ot);
+
+void GPENCIL_OT_palette_add(struct wmOperatorType *ot);
+void GPENCIL_OT_palette_remove(struct wmOperatorType *ot);
+void GPENCIL_OT_palette_change(struct wmOperatorType *ot);
+void GPENCIL_OT_palette_lock_layer(struct wmOperatorType *ot);
+void GPENCIL_OT_palettecolor_add(struct wmOperatorType *ot);
+void GPENCIL_OT_palettecolor_remove(struct wmOperatorType *ot);
+void GPENCIL_OT_palettecolor_isolate(struct wmOperatorType *ot);
+
+void GPENCIL_OT_palettecolor_hide(struct wmOperatorType *ot);
+void GPENCIL_OT_palettecolor_reveal(struct wmOperatorType *ot);
+void GPENCIL_OT_palettecolor_lock_all(struct wmOperatorType *ot);
+void GPENCIL_OT_palettecolor_unlock_all(struct wmOperatorType *ot);
+void GPENCIL_OT_palettecolor_move(struct wmOperatorType *ot);
+void GPENCIL_OT_palettecolor_select(struct wmOperatorType *ot);
+void GPENCIL_OT_palettecolor_copy(struct wmOperatorType *ot);
+
 /* undo stack ---------- */
 
 void gpencil_undo_init(struct bGPdata *gpd);
@@ -273,4 +358,39 @@ typedef enum ACTCONT_TYPES {
 	ACTCONT_GPENCIL
 } ACTCONT_TYPES;
 
+/**
+* Iterate over all editable strokes in the current context,
+* stopping on each usable layer + stroke pair (i.e. gpl and gps)
+* to perform some operations on the stroke.
+*
+* \param gpl  The identifier to use for the layer of the stroke being processed.
+*                    Choose a suitable value to avoid name clashes.
+* \param gps The identifier to use for current stroke being processed.
+*                    Choose a suitable value to avoid name clashes.
+*/
+#define GP_EDITABLE_STROKES_BEGIN(C, gpl, gps)                                          \
+{                                                                                       \
+	CTX_DATA_BEGIN(C, bGPDlayer*, gpl, editable_gpencil_layers)                         \
+	{                                                                                   \
+		if (gpl->actframe == NULL)                                                      \
+			continue;                                                                   \
+		/* calculate difference matrix if parent object */                              \
+		float diff_mat[4][4];                                                           \
+		ED_gpencil_parent_location(gpl, diff_mat);                                      \
+		/* loop over strokes */                                                         \
+		for (bGPDstroke *gps = gpl->actframe->strokes.first; gps; gps = gps->next) {    \
+			/* skip strokes that are invalid for current view */                        \
+			if (ED_gpencil_stroke_can_use(C, gps) == false)                             \
+				continue;                                                               \
+			/* check if the color is editable */                                        \
+			if (ED_gpencil_stroke_color_use(gpl, gps) == false)                         \
+				continue;                                                               \
+			/* ... Do Stuff With Strokes ...  */
+
+#define GP_EDITABLE_STROKES_END    \
+		}                          \
+	}                              \
+	CTX_DATA_END;                  \
+} (void)0
+
 #endif /* __GPENCIL_INTERN_H__ */
diff --git a/source/blender/editors/gpencil/gpencil_ops.c b/source/blender/editors/gpencil/gpencil_ops.c
index 65ee1122b56..6bbb8f7c965 100644
--- a/source/blender/editors/gpencil/gpencil_ops.c
+++ b/source/blender/editors/gpencil/gpencil_ops.c
@@ -18,7 +18,7 @@
  * The Original Code is Copyright (C) 2009, Blender Foundation, Joshua Leung
  * This is a new part of Blender
  *
- * Contributor(s): Joshua Leung
+ * Contributor(s): Joshua Leung, Antonio Vazquez
  *
  * ***** END GPL LICENSE BLOCK *****
  */
@@ -140,8 +140,8 @@ static void ed_keymap_gpencil_editing(wmKeyConfig *keyconf)
 	 *       that the only data being edited is that of the Grease Pencil strokes
 	 */
 	
-	/* FKEY = Eraser Radius */
-	kmi = WM_keymap_add_item(keymap, "WM_OT_radial_control", FKEY, KM_PRESS, 0, 0);
+	/* CTRL + FKEY = Eraser Radius */
+	kmi = WM_keymap_add_item(keymap, "WM_OT_radial_control", FKEY, KM_PRESS, KM_CTRL, 0);
 	RNA_string_set(kmi->ptr, "data_path_primary", "user_preferences.edit.grease_pencil_eraser_radius");
 	
 	
@@ -169,8 +169,8 @@ static void ed_keymap_gpencil_editing(wmKeyConfig *keyconf)
 	kmi = WM_keymap_add_item(keymap, "WM_OT_radial_control", FKEY, KM_PRESS, KM_SHIFT, 0);
 	RNA_string_set(kmi->ptr, "data_path_primary", "tool_settings.gpencil_sculpt.brush.strength");
 	
-	/* Ctrl-FKEY = Sculpt Brush Size */
-	kmi = WM_keymap_add_item(keymap, "WM_OT_radial_control", FKEY, KM_PRESS, KM_CTRL, 0);
+	/* FKEY = Sculpt Brush Size */
+	kmi = WM_keymap_add_item(keymap, "WM_OT_radial_control", FKEY, KM_PRESS, 0, 0);
 	RNA_string_set(kmi->ptr, "data_path_primary", "tool_settings.gpencil_sculpt.brush.size");
 	
 	
@@ -266,14 +266,37 @@ static void ed_keymap_gpencil_editing(wmKeyConfig *keyconf)
 	
 	kmi = WM_keymap_add_item(keymap, "GPENCIL_OT_hide", HKEY, KM_PRESS, KM_SHIFT, 0);
 	RNA_boolean_set(kmi->ptr, "unselected", true);
+
+	WM_keymap_add_item(keymap, "GPENCIL_OT_selection_opacity_toggle", HKEY, KM_PRESS, KM_CTRL, 0);
 	
 	/* Isolate Layer */
 	WM_keymap_add_item(keymap, "GPENCIL_OT_layer_isolate", PADASTERKEY, KM_PRESS, 0, 0);
 	
 	/* Move to Layer */
 	WM_keymap_add_item(keymap, "GPENCIL_OT_move_to_layer", MKEY, KM_PRESS, 0, 0);
-	
-	
+
+	/* Select drawing brush using index */
+	kmi = WM_keymap_add_item(keymap, "GPENCIL_OT_brush_select", ONEKEY, KM_PRESS, 0, 0); 
+	RNA_int_set(kmi->ptr, "index", 0);
+	kmi = WM_keymap_add_item(keymap, "GPENCIL_OT_brush_select", TWOKEY, KM_PRESS, 0, 0);
+	RNA_int_set(kmi->ptr, "index", 1);
+	kmi = WM_keymap_add_item(keymap, "GPENCIL_OT_brush_select", THREEKEY, KM_PRESS, 0, 0);
+	RNA_int_set(kmi->ptr, "index", 2);
+	kmi = WM_keymap_add_item(keymap, "GPENCIL_OT_brush_select", FOURKEY, KM_PRESS, 0, 0);
+	RNA_int_set(kmi->ptr, "index", 3);
+	kmi = WM_keymap_add_item(keymap, "GPENCIL_OT_brush_select", FIVEKEY, KM_PRESS, 0, 0);
+	RNA_int_set(kmi->ptr, "index", 4);
+	kmi = WM_keymap_add_item(keymap, "GPENCIL_OT_brush_select", SIXKEY, KM_PRESS, 0, 0);
+	RNA_int_set(kmi->ptr, "index", 5);
+	kmi = WM_keymap_add_item(keymap, "GPENCIL_OT_brush_select", SEVENKEY, KM_PRESS, 0, 0);
+	RNA_int_set(kmi->ptr, "index", 6);
+	kmi = WM_keymap_add_item(keymap, "GPENCIL_OT_brush_select", EIGHTKEY, KM_PRESS, 0, 0);
+	RNA_int_set(kmi->ptr, "index", 7);
+	kmi = WM_keymap_add_item(keymap, "GPENCIL_OT_brush_select", NINEKEY, KM_PRESS, 0, 0);
+	RNA_int_set(kmi->ptr, "index", 8);
+	kmi = WM_keymap_add_item(keymap, "GPENCIL_OT_brush_select", ZEROKEY, KM_PRESS, 0, 0);
+	RNA_int_set(kmi->ptr, "index", 9);
+
 	/* Transform Tools */
 	kmi = WM_keymap_add_item(keymap, "TRANSFORM_OT_translate", GKEY, KM_PRESS, 0, 0);
 	
@@ -318,7 +341,8 @@ void ED_operatortypes_gpencil(void)
 	/* Editing (Strokes) ------------ */
 	
 	WM_operatortype_append(GPENCIL_OT_editmode_toggle);
-	
+	WM_operatortype_append(GPENCIL_OT_selection_opacity_toggle);
+
 	WM_operatortype_append(GPENCIL_OT_select);
 	WM_operatortype_append(GPENCIL_OT_select_all);
 	WM_operatortype_append(GPENCIL_OT_select_circle);
@@ -362,12 +386,44 @@ void ED_operatortypes_gpencil(void)
 	WM_operatortype_append(GPENCIL_OT_lock_all);
 	WM_operatortype_append(GPENCIL_OT_unlock_all);
 	WM_operatortype_append(GPENCIL_OT_layer_isolate);
-	
+	WM_operatortype_append(GPENCIL_OT_layer_merge);
+
 	WM_operatortype_append(GPENCIL_OT_active_frame_delete);
 	WM_operatortype_append(GPENCIL_OT_active_frames_delete_all);
 	
 	WM_operatortype_append(GPENCIL_OT_convert);
 
+	WM_operatortype_append(GPENCIL_OT_stroke_arrange);
+	WM_operatortype_append(GPENCIL_OT_stroke_change_color);
+	WM_operatortype_append(GPENCIL_OT_stroke_lock_color);
+	WM_operatortype_append(GPENCIL_OT_stroke_apply_thickness);
+	WM_operatortype_append(GPENCIL_OT_stroke_cyclical_set);
+	WM_operatortype_append(GPENCIL_OT_stroke_join);
+	WM_operatortype_append(GPENCIL_OT_stroke_flip);
+
+	WM_operatortype_append(GPENCIL_OT_palette_add);
+	WM_operatortype_append(GPENCIL_OT_palette_remove);
+	WM_operatortype_append(GPENCIL_OT_palette_change);
+	WM_operatortype_append(GPENCIL_OT_palette_lock_layer);
+	WM_operatortype_append(GPENCIL_OT_palettecolor_add);
+	WM_operatortype_append(GPENCIL_OT_palettecolor_remove);
+	WM_operatortype_append(GPENCIL_OT_palettecolor_isolate);
+	WM_operatortype_append(GPENCIL_OT_palettecolor_hide);
+	WM_operatortype_append(GPENCIL_OT_palettecolor_reveal);
+	WM_operatortype_append(GPENCIL_OT_palettecolor_lock_all);
+	WM_operatortype_append(GPENCIL_OT_palettecolor_unlock_all);
+	WM_operatortype_append(GPENCIL_OT_palettecolor_move);
+	WM_operatortype_append(GPENCIL_OT_palettecolor_select);
+	WM_operatortype_append(GPENCIL_OT_palettecolor_copy);
+
+	WM_operatortype_append(GPENCIL_OT_brush_add);
+	WM_operatortype_append(GPENCIL_OT_brush_remove);
+	WM_operatortype_append(GPENCIL_OT_brush_change);
+	WM_operatortype_append(GPENCIL_OT_brush_move);
+	WM_operatortype_append(GPENCIL_OT_brush_presets_create);
+	WM_operatortype_append(GPENCIL_OT_brush_copy);
+	WM_operatortype_append(GPENCIL_OT_brush_select);
+
 	/* Editing (Time) --------------- */
 }
 
diff --git a/source/blender/editors/gpencil/gpencil_paint.c b/source/blender/editors/gpencil/gpencil_paint.c
index a570d586f50..403d632b5da 100644
--- a/source/blender/editors/gpencil/gpencil_paint.c
+++ b/source/blender/editors/gpencil/gpencil_paint.c
@@ -18,7 +18,7 @@
  * The Original Code is Copyright (C) 2008, Blender Foundation, Joshua Leung
  * This is a new part of Blender
  *
- * Contributor(s): Joshua Leung
+ * Contributor(s): Joshua Leung, Antonio Vazquez
  *
  * ***** END GPL LICENSE BLOCK *****
  */
@@ -39,21 +39,26 @@
 #include "BLI_blenlib.h"
 #include "BLI_math.h"
 #include "BLI_utildefines.h"
+#include "BLI_rand.h"
 
 #include "BLT_translation.h"
 
 #include "PIL_time.h"
 
+#include "BKE_main.h"
+#include "BKE_paint.h"
 #include "BKE_gpencil.h"
 #include "BKE_context.h"
 #include "BKE_global.h"
 #include "BKE_report.h"
 #include "BKE_screen.h"
 #include "BKE_tracking.h"
+#include "BKE_colortools.h"
 
 #include "DNA_object_types.h"
 #include "DNA_scene_types.h"
 #include "DNA_gpencil_types.h"
+#include "DNA_brush_types.h"
 #include "DNA_windowmanager_types.h"
 
 #include "UI_view2d.h"
@@ -151,6 +156,10 @@ typedef struct tGPsdata {
 	float custom_color[4]; /* custom color - hack for enforcing a particular color for track/mask editing */
 	
 	void *erasercursor; /* radial cursor data for drawing eraser */
+
+	bGPDpalettecolor *palettecolor; /* current palette color */
+	bGPDbrush *brush; /* current drawing brush */
+	short straight[2];   /* 1: line horizontal, 2: line vertical, other: not defined, second element position */
 } tGPsdata;
 
 /* ------ */
@@ -333,10 +342,90 @@ static void gp_stroke_convertcoords(tGPsdata *p, const int mval[2], float out[3]
 	}
 }
 
+/* apply jitter to stroke */
+static void gp_brush_jitter(bGPdata *gpd, bGPDbrush *brush, tGPspoint *pt, const int mval[2], int r_mval[2])
+{
+	float pressure = pt->pressure;
+	float tmp_pressure = pt->pressure;
+	if (brush->draw_jitter > 0.0f) {
+		float curvef = curvemapping_evaluateF(brush->cur_jitter, 0, pressure);
+		tmp_pressure = curvef * brush->draw_sensitivity;
+	}
+	const float exfactor = (brush->draw_jitter + 2.0f) * (brush->draw_jitter + 2.0f); /* exponential value */
+	const float fac = BLI_frand() * exfactor * tmp_pressure;
+	/* Jitter is applied perpendicular to the mouse movement vector (2D space) */
+	float mvec[2], svec[2];
+	/* mouse movement in ints -> floats */
+	if (gpd->sbuffer_size > 1) {
+		mvec[0] = (float)(mval[0] - (pt - 1)->x);
+		mvec[1] = (float)(mval[1] - (pt - 1)->y);
+		normalize_v2(mvec);
+	}
+	else {
+		mvec[0] = 0.0f;
+		mvec[1] = 0.0f;
+	}
+	/* rotate mvec by 90 degrees... */
+	svec[0] = -mvec[1];
+	svec[1] = mvec[0];
+	/* scale the displacement by the random, and apply */
+	if (BLI_frand() > 0.5f) {
+		mul_v2_fl(svec, -fac);
+	}
+	else {
+		mul_v2_fl(svec, fac);
+	}
+
+	r_mval[0] = mval[0] + svec[0];
+	r_mval[1] = mval[1] + svec[1];
+
+}
+
+/* apply pressure change depending of the angle of the stroke to simulate a pen with shape */
+static void gp_brush_angle(bGPdata *gpd, bGPDbrush *brush, tGPspoint *pt, const int mval[2])
+{
+	float mvec[2];
+	float sen = brush->draw_angle_factor; /* sensitivity */;
+	float fac;
+	float mpressure;
+
+	float angle = brush->draw_angle; /* default angle of brush in radians */;
+	float v0[2] = { cos(angle), sin(angle) }; /* angle vector of the brush with full thickness */
+
+	/* Apply to first point (only if there are 2 points because before no data to do it ) */
+	if (gpd->sbuffer_size == 1) {
+		mvec[0] = (float)(mval[0] - (pt - 1)->x);
+		mvec[1] = (float)(mval[1] - (pt - 1)->y);
+		normalize_v2(mvec);
+
+		/* uses > 1.0f to get a smooth transition in first point */
+		fac = 1.4f - fabs(dot_v2v2(v0, mvec)); /* 0.0 to 1.0 */
+		(pt - 1)->pressure = (pt - 1)->pressure - (sen * fac);
+
+		CLAMP((pt - 1)->pressure, GPENCIL_ALPHA_OPACITY_THRESH, 1.0f);
+	}
+
+	/* apply from second point */
+	if (gpd->sbuffer_size >= 1) {
+		mvec[0] = (float)(mval[0] - (pt - 1)->x);
+		mvec[1] = (float)(mval[1] - (pt - 1)->y);
+		normalize_v2(mvec);
+
+		fac = 1.0f - fabs(dot_v2v2(v0, mvec)); /* 0.0 to 1.0 */
+		/* interpolate with previous point for smoother transitions */
+		mpressure = interpf(pt->pressure - (sen * fac), (pt - 1)->pressure, 0.3f);
+		pt->pressure = mpressure; 
+
+		CLAMP(pt->pressure, GPENCIL_ALPHA_OPACITY_THRESH, 1.0f);
+	}
+
+}
+
 /* add current stroke-point to buffer (returns whether point was successfully added) */
 static short gp_stroke_addpoint(tGPsdata *p, const int mval[2], float pressure, double curtime)
 {
 	bGPdata *gpd = p->gpd;
+	bGPDbrush *brush = p->brush;
 	tGPspoint *pt;
 	
 	/* check painting mode */
@@ -349,6 +438,7 @@ static short gp_stroke_addpoint(tGPsdata *p, const int mval[2], float pressure,
 			/* store settings */
 			copy_v2_v2_int(&pt->x, mval);
 			pt->pressure = 1.0f; /* T44932 - Pressure vals are unreliable, so ignore for now */
+			pt->strength = 1.0f;
 			pt->time = (float)(curtime - p->inittime);
 			
 			/* increment buffer size */
@@ -363,6 +453,7 @@ static short gp_stroke_addpoint(tGPsdata *p, const int mval[2], float pressure,
 			/* store settings */
 			copy_v2_v2_int(&pt->x, mval);
 			pt->pressure = 1.0f; /* T44932 - Pressure vals are unreliable, so ignore for now */
+			pt->strength = 1.0f;
 			pt->time = (float)(curtime - p->inittime);
 			
 			/* now the buffer has 2 points (and shouldn't be allowed to get any larger) */
@@ -381,8 +472,65 @@ static short gp_stroke_addpoint(tGPsdata *p, const int mval[2], float pressure,
 		pt = ((tGPspoint *)(gpd->sbuffer) + gpd->sbuffer_size);
 		
 		/* store settings */
-		copy_v2_v2_int(&pt->x, mval);
-		pt->pressure = pressure;
+		/* pressure */
+		if (brush->flag & GP_BRUSH_USE_PRESSURE) {
+			float curvef = curvemapping_evaluateF(brush->cur_sensitivity, 0, pressure);
+			pt->pressure = curvef * brush->draw_sensitivity;
+		}
+		else {
+			pt->pressure = 1.0f;
+		}
+		/* Apply jitter to position */
+		if (brush->draw_jitter > 0.0f) {
+			int r_mval[2];
+			gp_brush_jitter(gpd, brush, pt, mval, r_mval);
+			copy_v2_v2_int(&pt->x, r_mval);
+		}
+		else {
+			copy_v2_v2_int(&pt->x, mval);
+		}
+		/* apply randomness to pressure */
+		if ((brush->draw_random_press > 0.0f) && (brush->flag & GP_BRUSH_USE_RANDOM_PRESSURE)) {
+			float curvef = curvemapping_evaluateF(brush->cur_sensitivity, 0, pressure);
+			float tmp_pressure = curvef * brush->draw_sensitivity;
+			if (BLI_frand() > 0.5f) {
+				pt->pressure -= tmp_pressure * brush->draw_random_press * BLI_frand();
+			}
+			else {
+				pt->pressure += tmp_pressure * brush->draw_random_press * BLI_frand();
+			}
+			CLAMP(pt->pressure, GPENCIL_STRENGTH_MIN, 1.0f);
+		}
+
+		/* apply angle of stroke to brush size */
+		if (brush->draw_angle_factor > 0.0f) {
+			gp_brush_angle(gpd, brush, pt, mval);
+		}
+
+		/* color strength */
+		if (brush->flag & GP_BRUSH_USE_STENGTH_PRESSURE) {
+			float curvef = curvemapping_evaluateF(brush->cur_strength, 0, pressure);
+			float tmp_pressure = curvef * brush->draw_sensitivity;
+
+			pt->strength = tmp_pressure * brush->draw_strength;
+		}
+		else {
+			pt->strength = brush->draw_strength;
+		}
+		CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);
+
+		/* apply randomness to color strength */
+		if ((brush->draw_random_press > 0.0f) && (brush->flag & GP_BRUSH_USE_RANDOM_STRENGTH)) {
+			if (BLI_frand() > 0.5f) {
+				pt->strength -= pt->strength * brush->draw_random_press * BLI_frand();
+			}
+			else {
+				pt->strength += pt->strength * brush->draw_random_press * BLI_frand();
+			}
+			CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);
+		}
+
+		/* point time */
 		pt->time = (float)(curtime - p->inittime);
 		
 		/* increment counters */
@@ -395,12 +543,15 @@ static short gp_stroke_addpoint(tGPsdata *p, const int mval[2], float pressure,
 			return GP_STROKEADD_NORMAL;
 	}
 	else if (p->paintmode == GP_PAINTMODE_DRAW_POLY) {
+		
+		bGPDlayer *gpl = gpencil_layer_getactive(gpd);
 		/* get pointer to destination point */
 		pt = (tGPspoint *)(gpd->sbuffer);
 		
 		/* store settings */
 		copy_v2_v2_int(&pt->x, mval);
 		pt->pressure = 1.0f; /* T44932 - Pressure vals are unreliable, so ignore for now */
+		pt->strength = 1.0f;
 		pt->time = (float)(curtime - p->inittime);
 		
 		/* if there's stroke for this poly line session add (or replace last) point
@@ -433,10 +584,16 @@ static short gp_stroke_addpoint(tGPsdata *p, const int mval[2], float pressure,
 			
 			/* convert screen-coordinates to appropriate coordinates (and store them) */
 			gp_stroke_convertcoords(p, &pt->x, &pts->x, NULL);
-			
+			/* if parented change position relative to parent object */
+			if (gpl->parent != NULL) {
+				gp_apply_parent_point(gpl, pts);
+			}
 			/* copy pressure and time */
 			pts->pressure = pt->pressure;
+			pts->strength = pt->strength;
 			pts->time = pt->time;
+			/* force fill recalc */
+			gps->flag |= GP_STROKE_RECALC_CACHES;
 		}
 		
 		/* increment counters */
@@ -534,6 +691,7 @@ static void gp_stroke_newfrombuffer(tGPsdata *p)
 	bGPDstroke *gps;
 	bGPDspoint *pt;
 	tGPspoint *ptc;
+	bGPDbrush *brush = p->brush;
 	
 	int i, totelem;
 	/* since strokes are so fine, when using their depth we need a margin otherwise they might get missed */
@@ -569,7 +727,7 @@ static void gp_stroke_newfrombuffer(tGPsdata *p)
 	
 	/* copy appropriate settings for stroke */
 	gps->totpoints = totelem;
-	gps->thickness = p->gpl->thickness;
+	gps->thickness = brush->thickness;
 	gps->flag = gpd->sbuffer_sflag;
 	gps->inittime = p->inittime;
 	
@@ -577,7 +735,7 @@ static void gp_stroke_newfrombuffer(tGPsdata *p)
 	gps->flag |= GP_STROKE_RECALC_CACHES;
 
 	/* allocate enough memory for a continuous array for storage points */
-	int sublevel = gpl->sublevel;
+	int sublevel = brush->sublevel;
 	int new_totpoints = gps->totpoints;
 	
 	for (i = 0; i < sublevel; i++) {
@@ -600,9 +758,14 @@ static void gp_stroke_newfrombuffer(tGPsdata *p)
 			
 			/* convert screen-coordinates to appropriate coordinates (and store them) */
 			gp_stroke_convertcoords(p, &ptc->x, &pt->x, NULL);
-			
+			/* if parented change position relative to parent object */
+			if (gpl->parent != NULL) {
+				gp_apply_parent_point(gpl, pt);
+			}
 			/* copy pressure and time */
 			pt->pressure = ptc->pressure;
+			pt->strength = ptc->strength;
+			CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);
 			pt->time = ptc->time;
 			
 			pt++;
@@ -614,9 +777,15 @@ static void gp_stroke_newfrombuffer(tGPsdata *p)
 			
 			/* convert screen-coordinates to appropriate coordinates (and store them) */
 			gp_stroke_convertcoords(p, &ptc->x, &pt->x, NULL);
-			
+			/* if parented change position relative to parent object */
+			if (gpl->parent != NULL) {
+				gp_apply_parent_point(gpl, pt);
+			}
+
 			/* copy pressure and time */
 			pt->pressure = ptc->pressure;
+			pt->strength = ptc->strength;
+			CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);
 			pt->time = ptc->time;
 		}
 	}
@@ -626,9 +795,14 @@ static void gp_stroke_newfrombuffer(tGPsdata *p)
 		
 		/* convert screen-coordinates to appropriate coordinates (and store them) */
 		gp_stroke_convertcoords(p, &ptc->x, &pt->x, NULL);
-		
+		/* if parented change position relative to parent object */
+		if (gpl->parent != NULL) {
+			gp_apply_parent_point(gpl, pt);
+		}
 		/* copy pressure and time */
 		pt->pressure = ptc->pressure;
+		pt->strength = ptc->strength;
+		CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);
 		pt->time = ptc->time;
 	}
 	else {
@@ -703,6 +877,8 @@ static void gp_stroke_newfrombuffer(tGPsdata *p)
 			
 			/* copy pressure and time */
 			pt->pressure = ptc->pressure;
+			pt->strength = ptc->strength;
+			CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);
 			pt->time = ptc->time;
 		}
 		
@@ -716,25 +892,38 @@ static void gp_stroke_newfrombuffer(tGPsdata *p)
 				gp_subdivide_stroke(gps, totpoints);
 			}
 		}
-		
+		/* apply randomness to stroke */
+		if (brush->draw_random_sub > 0.0f) {
+			gp_randomize_stroke(gps, brush);
+		}
+
 		/* smooth stroke after subdiv - only if there's something to do 
 		 * for each iteration, the factor is reduced to get a better smoothing without changing too much 
 		 * the original stroke
 		 */
-		if (gpl->draw_smoothfac > 0.0f) {
+		if (brush->draw_smoothfac > 0.0f) {
 			float reduce = 0.0f;
-			for (int r = 0; r < gpl->draw_smoothlvl; ++r) {
+			for (int r = 0; r < brush->draw_smoothlvl; ++r) {
 				for (i = 0; i < gps->totpoints; i++) {
 					/* NOTE: No pressure smoothing, or else we get annoying thickness changes while drawing... */
-					gp_smooth_stroke(gps, i, gpl->draw_smoothfac - reduce, false);
+					gp_smooth_stroke(gps, i, brush->draw_smoothfac - reduce, false);
 				}
 				reduce += 0.25f;  // reduce the factor
 			}
 		}
-		
+		/* if parented change position relative to parent object */
+		if (gpl->parent != NULL) {
+			gp_apply_parent(gpl, gps);
+		}
+
 		if (depth_arr)
 			MEM_freeN(depth_arr);
 	}
+	/* Save palette color */
+	bGPDpalette *palette = gpencil_palette_getactive(p->gpd);
+	bGPDpalettecolor *palcolor = gpencil_palettecolor_getactive(palette);
+	gps->palcolor = palcolor;
+	strcpy(gps->colorname, palcolor->info);
 
 	/* add stroke to frame */
 	BLI_addtail(&p->gpf->strokes, gps);
@@ -761,12 +950,21 @@ static bool gp_stroke_eraser_is_occluded(tGPsdata *p, const bGPDspoint *pt, cons
 	    (p->flags & GP_PAINTFLAG_V3D_ERASER_DEPTH))
 	{
 		RegionView3D *rv3d = p->ar->regiondata;
+		bGPDlayer *gpl = p->gpl;
+
 		const int mval[2] = {x, y};
 		float mval_3d[3];
-		
+		float fpt[3];
+
+		float diff_mat[4][4];
+		/* calculate difference matrix if parent object */
+		ED_gpencil_parent_location(gpl, diff_mat);
+
 		if (ED_view3d_autodist_simple(p->ar, mval, mval_3d, 0, NULL)) {
 			const float depth_mval = view3d_point_depth(rv3d, mval_3d);
-			const float depth_pt   = view3d_point_depth(rv3d, &pt->x);
+
+			mul_v3_m4v3(fpt, diff_mat, &pt->x);
+			const float depth_pt   = view3d_point_depth(rv3d, fpt);
 			
 			if (depth_pt > depth_mval) {
 				return true;
@@ -804,7 +1002,13 @@ static void gp_stroke_eraser_dostroke(tGPsdata *p,
 	int pc1[2] = {0};
 	int pc2[2] = {0};
 	int i;
-	
+	float diff_mat[4][4];
+
+	/* calculate difference matrix if parent object */
+	if (gpl->parent != NULL) {
+		ED_gpencil_parent_location(gpl, diff_mat);
+	}
+
 	if (gps->totpoints == 0) {
 		/* just free stroke */
 		if (gps->points)
@@ -816,8 +1020,14 @@ static void gp_stroke_eraser_dostroke(tGPsdata *p,
 	else if (gps->totpoints == 1) {
 		/* only process if it hasn't been masked out... */
 		if (!(p->flags & GP_PAINTFLAG_SELECTMASK) || (gps->points->flag & GP_SPOINT_SELECT)) {
-			gp_point_to_xy(&p->gsc, gps, gps->points, &pc1[0], &pc1[1]);
-			
+			if (gpl->parent == NULL) {
+				gp_point_to_xy(&p->gsc, gps, gps->points, &pc1[0], &pc1[1]);
+			}
+			else {
+				bGPDspoint pt_temp;
+				gp_point_to_parent_space(gps->points, diff_mat, &pt_temp);
+				gp_point_to_xy(&p->gsc, gps, &pt_temp, &pc1[0], &pc1[1]);
+			}
 			/* do boundbox check first */
 			if ((!ELEM(V2D_IS_CLIPPED, pc1[0], pc1[1])) && BLI_rcti_isect_pt(rect, pc1[0], pc1[1])) {
 				/* only check if point is inside */
@@ -826,7 +1036,7 @@ static void gp_stroke_eraser_dostroke(tGPsdata *p,
 					// XXX: pressure sensitive eraser should apply here too?
 					MEM_freeN(gps->points);
 					if (gps->triangles)
-						 MEM_freeN(gps->triangles);
+						MEM_freeN(gps->triangles);
 					BLI_freelinkN(&gpf->strokes, gps);
 				}
 			}
@@ -836,7 +1046,7 @@ static void gp_stroke_eraser_dostroke(tGPsdata *p,
 		/* Pressure threshold at which stroke should be culled: Calculated as pressure value
 		 * below which we would have invisible strokes
 		 */
-		const float cull_thresh = (gpl->thickness) ?  1.0f / ((float)gpl->thickness)  : 1.0f;
+		const float cull_thresh = (gps->thickness) ?  1.0f / ((float)gps->thickness)  : 1.0f;
 		
 		/* Amount to decrease the pressure of each point with each stroke */
 		// TODO: Fetch from toolsettings, or compute based on thickness instead?
@@ -865,15 +1075,24 @@ static void gp_stroke_eraser_dostroke(tGPsdata *p,
 			/* get points to work with */
 			pt1 = gps->points + i;
 			pt2 = gps->points + i + 1;
-			
+
 			/* only process if it hasn't been masked out... */
 			if ((p->flags & GP_PAINTFLAG_SELECTMASK) && !(gps->points->flag & GP_SPOINT_SELECT))
 				continue;
 			
-			/* get coordinates of point in screenspace */
-			gp_point_to_xy(&p->gsc, gps, pt1, &pc1[0], &pc1[1]);
-			gp_point_to_xy(&p->gsc, gps, pt2, &pc2[0], &pc2[1]);
-			
+			if (gpl->parent == NULL) {
+				gp_point_to_xy(&p->gsc, gps, pt1, &pc1[0], &pc1[1]);
+				gp_point_to_xy(&p->gsc, gps, pt2, &pc2[0], &pc2[1]);
+			}
+			else {
+				bGPDspoint npt;
+				gp_point_to_parent_space(pt1, diff_mat, &npt);
+				gp_point_to_xy(&p->gsc, gps, &npt, &pc1[0], &pc1[1]);
+
+				gp_point_to_parent_space(pt2, diff_mat, &npt);
+				gp_point_to_xy(&p->gsc, gps, &npt, &pc2[0], &pc2[1]);
+			}
+
 			/* Check that point segment of the boundbox of the eraser stroke */
 			if (((!ELEM(V2D_IS_CLIPPED, pc1[0], pc1[1])) && BLI_rcti_isect_pt(rect, pc1[0], pc1[1])) ||
 			    ((!ELEM(V2D_IS_CLIPPED, pc2[0], pc2[1])) && BLI_rcti_isect_pt(rect, pc2[0], pc2[1])))
@@ -955,7 +1174,10 @@ static void gp_stroke_doeraser(tGPsdata *p)
 		/* loop over strokes, checking segments for intersections */
 		for (gps = gpf->strokes.first; gps; gps = gpn) {
 			gpn = gps->next;
-			
+			/* check if the color is editable */
+			if (ED_gpencil_stroke_color_use(gpl, gps) == false) {
+				continue;
+			}
 			/* Not all strokes in the datablock may be valid in the current editor/context
 			 * (e.g. 2D space strokes in the 3D view, if the same datablock is shared)
 			 */
@@ -994,6 +1216,78 @@ static void gp_session_validatebuffer(tGPsdata *p)
 	p->inittime = 0.0;
 }
 
+/* create a new palette color */
+static bGPDpalettecolor *gp_create_new_color(bGPDpalette *palette)
+{
+	bGPDpalettecolor *palcolor;
+
+	palcolor = gpencil_palettecolor_addnew(palette, DATA_("Color"), true);
+	
+	return palcolor;
+}
+
+/* initialize a drawing brush */
+static void gp_init_drawing_brush(ToolSettings *ts, tGPsdata *p)
+{
+	bGPDbrush *brush;
+
+	/* if not exist, create a new one */
+	if (BLI_listbase_is_empty(&ts->gp_brushes)) {
+		/* create new brushes */
+		gpencil_brush_init_presets(ts);
+		brush = gpencil_brush_getactive(ts);
+	}
+	else {
+		/* Use the current */
+		brush = gpencil_brush_getactive(ts);
+	}
+	/* be sure curves are initializated */
+	curvemapping_initialize(brush->cur_sensitivity);
+	curvemapping_initialize(brush->cur_strength);
+	curvemapping_initialize(brush->cur_jitter);
+
+	/* asign to temp tGPsdata */
+	p->brush = brush;
+}
+
+
+/* initialize a paint palette brush and a default color if not exist */
+static void gp_init_palette(tGPsdata *p)
+{
+	bGPdata *gpd;
+	bGPDpalette *palette;
+	bGPDpalettecolor *palcolor;
+
+	gpd = p->gpd;
+
+	/* if not exist, create a new palette */
+	if (BLI_listbase_is_empty(&gpd->palettes)) {
+		/* create new palette */
+		palette = gpencil_palette_addnew(gpd, DATA_("GP_Palette"), true);
+		/* now create a default color */
+		palcolor = gp_create_new_color(palette);
+	}
+	else {
+		/* Use the current palette and color */
+		palette = gpencil_palette_getactive(gpd);
+		/* the palette needs one color */
+		if (BLI_listbase_is_empty(&palette->colors)) {
+			palcolor = gp_create_new_color(palette);
+		}
+		else {
+			palcolor = gpencil_palettecolor_getactive(palette);
+		}
+		/* in some situations can be null, so use first */
+		if (palcolor == NULL) {
+			gpencil_palettecolor_setactive(palette, palette->colors.first);
+			palcolor = palette->colors.first;
+		}
+	}
+
+	/* asign to temp tGPsdata */
+	p->palettecolor = palcolor;
+}
+
 /* (re)init new painting data */
 static bool gp_session_initdata(bContext *C, tGPsdata *p)
 {
@@ -1158,7 +1452,16 @@ static bool gp_session_initdata(bContext *C, tGPsdata *p)
 	
 	/* clear out buffer (stored in gp-data), in case something contaminated it */
 	gp_session_validatebuffer(p);
-	
+	/* set brush and create a new one if null */
+	gp_init_drawing_brush(ts, p);
+	/* set palette info and create a new one if null */
+	gp_init_palette(p);
+	/* set palette colors */
+	bGPDpalettecolor *palcolor = p->palettecolor;
+	bGPdata *pdata = p->gpd;
+	copy_v4_v4(pdata->scolor, palcolor->color);
+	pdata->sflag = palcolor->flag;
+
 	return 1;
 }
 
@@ -1177,7 +1480,7 @@ static tGPsdata *gp_session_initpaint(bContext *C)
 	 *       erase size won't get lost
 	 */
 	p->radius = U.gp_eraser;
-	
+
 	/* return context data for running paint operator */
 	return p;
 }
@@ -1495,7 +1798,6 @@ static bool gpencil_is_tablet_eraser_active(const wmEvent *event)
 
 /* ------------------------------- */
 
-
 static void gpencil_draw_exit(bContext *C, wmOperator *op)
 {
 	tGPsdata *p = op->customdata;
@@ -1513,7 +1815,7 @@ static void gpencil_draw_exit(bContext *C, wmOperator *op)
 			/* turn off radial brush cursor */
 			gpencil_draw_toggle_eraser_cursor(C, p, false);
 		}
-		
+
 		/* always store the new eraser size to be used again next time
 		 * NOTE: Do this even when not in eraser mode, as eraser may
 		 *       have been toggled at some point.
@@ -1600,7 +1902,7 @@ static void gpencil_draw_status_indicators(tGPsdata *p)
 					break;
 				case GP_PAINTMODE_DRAW:
 					ED_area_headerprint(p->sa, IFACE_("Grease Pencil Freehand Session: Hold and drag LMB to draw | "
-					                                  "ESC/Enter to end  (or click outside this area)"));
+					                                  "E/ESC/Enter to end  (or click outside this area)"));
 					break;
 				case GP_PAINTMODE_DRAW_POLY:
 					ED_area_headerprint(p->sa, IFACE_("Grease Pencil Poly Session: LMB click to place next stroke vertex | "
@@ -1691,6 +1993,31 @@ static void gpencil_draw_apply_event(wmOperator *op, const wmEvent *event)
 	 */
 	p->mval[0] = event->mval[0] + 1;
 	p->mval[1] = event->mval[1] + 1;
+	
+	/* verify key status for straight lines */
+	if ((event->ctrl > 0) || (event->alt > 0)) {
+		if (p->straight[0] == 0) {
+			int dx = abs(p->mval[0] - p->mvalo[0]);
+			int dy = abs(p->mval[1] - p->mvalo[1]);
+			if ((dx > 0) || (dy > 0)) {
+				/* check mouse direction to replace the other coordinate with previous values */
+				if (dx >= dy) {
+					/* horizontal */
+					p->straight[0] = 1;
+					p->straight[1] = p->mval[1]; /* save y */
+				}
+				else {
+					/* vertical */
+					p->straight[0] = 2;
+					p->straight[1] = p->mval[0]; /* save x */
+				}
+			}
+		}
+	}
+	else {
+		p->straight[0] = 0;
+	}
+
 	p->curtime = PIL_check_seconds_timer();
 	
 	/* handle pressure sensitivity (which is supplied by tablets) */
@@ -1725,7 +2052,9 @@ static void gpencil_draw_apply_event(wmOperator *op, const wmEvent *event)
 		p->mvalo[1] = p->mval[1];
 		p->opressure = p->pressure;
 		p->inittime = p->ocurtime = p->curtime;
-		
+		p->straight[0] = 0;
+		p->straight[1] = 0;
+
 		/* special exception here for too high pressure values on first touch in
 		 *  windows for some tablets, then we just skip first touch...
 		 */
@@ -1733,6 +2062,18 @@ static void gpencil_draw_apply_event(wmOperator *op, const wmEvent *event)
 			return;
 	}
 	
+	/* check if alt key is pressed and limit to straight lines */
+	if (p->straight[0] != 0) {
+		if (p->straight[0] == 1) {
+			/* horizontal */
+			p->mval[1] = p->straight[1]; /* replace y */
+		}
+		else {
+			/* vertical */
+			p->mval[0] = p->straight[1]; /* replace x */
+		}
+	}
+
 	/* fill in stroke data (not actually used directly by gpencil_draw_apply) */
 	RNA_collection_add(op->ptr, "stroke", &itemptr);
 	
@@ -1855,21 +2196,21 @@ static int gpencil_draw_invoke(bContext *C, wmOperator *op, const wmEvent *event
 	if (p->paintmode == GP_PAINTMODE_ERASER) {
 		gpencil_draw_toggle_eraser_cursor(C, p, true);
 	}
-	
 	/* set cursor 
 	 * NOTE: This may change later (i.e. intentionally via brush toggle,
 	 *       or unintentionally if the user scrolls outside the area)...
 	 */
 	gpencil_draw_cursor_set(p);
-	
+
 	/* only start drawing immediately if we're allowed to do so... */
 	if (RNA_boolean_get(op->ptr, "wait_for_input") == false) {
 		/* hotkey invoked - start drawing */
 		/* printf("\tGP - set first spot\n"); */
 		p->status = GP_STATUS_PAINTING;
-		
+
 		/* handle the initial drawing - i.e. for just doing a simple dot */
 		gpencil_draw_apply_event(op, event);
+		op->flag |= OP_IS_MODAL_CURSOR_REGION;
 	}
 	else {
 		/* toolbar invoked - don't start drawing yet... */
@@ -1976,6 +2317,10 @@ static int gpencil_draw_modal(bContext *C, wmOperator *op, const wmEvent *event)
 			 *   is essential for ensuring that they can quickly return to that view
 			 */
 		}
+		else if ((ELEM(event->type, DKEY)) && (event->val == KM_RELEASE)) {
+			/* enable continuous if release D key in mid drawing */
+			p->scene->toolsettings->gpencil_flags |= GP_TOOL_FLAG_PAINTSESSIONS_ON;
+		}
 		else {
 			estate = OPERATOR_RUNNING_MODAL;
 		}
@@ -1986,7 +2331,7 @@ static int gpencil_draw_modal(bContext *C, wmOperator *op, const wmEvent *event)
 	/* exit painting mode (and/or end current stroke)
 	 * NOTE: cannot do RIGHTMOUSE (as is standard for canceling) as that would break polyline [#32647]
 	 */
-	if (ELEM(event->type, RETKEY, PADENTER, ESCKEY, SPACEKEY)) {
+	if (ELEM(event->type, RETKEY, PADENTER, ESCKEY, SPACEKEY, EKEY)) {
 		/* exit() ends the current stroke before cleaning up */
 		/* printf("\t\tGP - end of paint op + end of stroke\n"); */
 		p->status = GP_STATUS_DONE;
@@ -2045,6 +2390,9 @@ static int gpencil_draw_modal(bContext *C, wmOperator *op, const wmEvent *event)
 			}
 			else {
 				/* printf("\t\tGP - end of stroke + op\n"); */
+				/* disable paint session */
+				p->scene->toolsettings->gpencil_flags &= ~GP_TOOL_FLAG_PAINTSESSIONS_ON;
+
 				p->status = GP_STATUS_DONE;
 				estate = OPERATOR_FINISHED;
 			}
@@ -2074,6 +2422,9 @@ static int gpencil_draw_modal(bContext *C, wmOperator *op, const wmEvent *event)
 					in_bounds = true;
 				}
 				else {
+					/* disable paint session */
+					p->scene->toolsettings->gpencil_flags &= ~GP_TOOL_FLAG_PAINTSESSIONS_ON;
+
 					/* Out of bounds, or invalid in some other way */
 					p->status = GP_STATUS_ERROR;
 					estate = OPERATOR_CANCELLED;
@@ -2090,6 +2441,9 @@ static int gpencil_draw_modal(bContext *C, wmOperator *op, const wmEvent *event)
 				in_bounds = BLI_rcti_isect_pt_v(&region_rect, event->mval);
 			}
 			else {
+				/* disable paint session */
+				p->scene->toolsettings->gpencil_flags &= ~GP_TOOL_FLAG_PAINTSESSIONS_ON;
+
 				/* No region */
 				p->status = GP_STATUS_ERROR;
 				estate = OPERATOR_CANCELLED;
@@ -2117,6 +2471,9 @@ static int gpencil_draw_modal(bContext *C, wmOperator *op, const wmEvent *event)
 				p = gpencil_stroke_begin(C, op);
 				
 				if (p->status == GP_STATUS_ERROR) {
+					/* disable paint session */
+					p->scene->toolsettings->gpencil_flags &= ~GP_TOOL_FLAG_PAINTSESSIONS_ON;
+
 					estate = OPERATOR_CANCELLED;
 				}
 			}
@@ -2125,6 +2482,9 @@ static int gpencil_draw_modal(bContext *C, wmOperator *op, const wmEvent *event)
 				 * NOTE: Don't eter this case if an error occurred while finding the
 				 *       region (as above)
 				 */
+				/* disable paint session */
+				p->scene->toolsettings->gpencil_flags &= ~GP_TOOL_FLAG_PAINTSESSIONS_ON;
+
 				p->status = GP_STATUS_DONE;
 				estate = OPERATOR_FINISHED;
 			}
diff --git a/source/blender/editors/gpencil/gpencil_select.c b/source/blender/editors/gpencil/gpencil_select.c
index b6482786b4f..612b35aa608 100644
--- a/source/blender/editors/gpencil/gpencil_select.c
+++ b/source/blender/editors/gpencil/gpencil_select.c
@@ -43,6 +43,7 @@
 #include "DNA_gpencil_types.h"
 #include "DNA_scene_types.h"
 #include "DNA_screen_types.h"
+#include "DNA_object_types.h"
 
 #include "BKE_context.h"
 #include "BKE_gpencil.h"
@@ -616,9 +617,10 @@ void GPENCIL_OT_select_less(wmOperatorType *ot)
 /* NOTE: Code here is adapted (i.e. copied directly) from gpencil_paint.c::gp_stroke_eraser_dostroke()
  *       It would be great to de-duplicate the logic here sometime, but that can wait...
  */
-static bool gp_stroke_do_circle_sel(bGPDstroke *gps, GP_SpaceConversion *gsc,
-                                    const int mx, const int my, const int radius, 
-                                    const bool select, rcti *rect)
+static bool gp_stroke_do_circle_sel(
+        bGPDstroke *gps, GP_SpaceConversion *gsc,
+        const int mx, const int my, const int radius,
+        const bool select, rcti *rect, const bool parented, float diff_mat[4][4])
 {
 	bGPDspoint *pt1, *pt2;
 	int x0 = 0, y0 = 0, x1 = 0, y1 = 0;
@@ -626,7 +628,14 @@ static bool gp_stroke_do_circle_sel(bGPDstroke *gps, GP_SpaceConversion *gsc,
 	bool changed = false;
 	
 	if (gps->totpoints == 1) {
-		gp_point_to_xy(gsc, gps, gps->points, &x0, &y0);
+		if (!parented) {
+			gp_point_to_xy(gsc, gps, gps->points, &x0, &y0);
+		}
+		else {
+			bGPDspoint pt_temp;
+			gp_point_to_parent_space(gps->points, diff_mat, &pt_temp);
+			gp_point_to_xy(gsc, gps, &pt_temp, &x0, &y0);
+		}
 		
 		/* do boundbox check first */
 		if ((!ELEM(V2D_IS_CLIPPED, x0, y0)) && BLI_rcti_isect_pt(rect, x0, y0)) {
@@ -654,9 +663,18 @@ static bool gp_stroke_do_circle_sel(bGPDstroke *gps, GP_SpaceConversion *gsc,
 			/* get points to work with */
 			pt1 = gps->points + i;
 			pt2 = gps->points + i + 1;
-			
-			gp_point_to_xy(gsc, gps, pt1, &x0, &y0);
-			gp_point_to_xy(gsc, gps, pt2, &x1, &y1);
+			if (!parented) {
+				gp_point_to_xy(gsc, gps, pt1, &x0, &y0);
+				gp_point_to_xy(gsc, gps, pt2, &x1, &y1);
+			}
+			else {
+				bGPDspoint npt;
+				gp_point_to_parent_space(pt1, diff_mat, &npt);
+				gp_point_to_xy(gsc, gps, &npt, &x0, &y0);
+
+				gp_point_to_parent_space(pt2, diff_mat, &npt);
+				gp_point_to_xy(gsc, gps, &npt, &x1, &y1);
+			}
 			
 			/* check that point segment of the boundbox of the selection stroke */
 			if (((!ELEM(V2D_IS_CLIPPED, x0, y0)) && BLI_rcti_isect_pt(rect, x0, y0)) ||
@@ -733,12 +751,14 @@ static int gpencil_circle_select_exec(bContext *C, wmOperator *op)
 	
 	
 	/* find visible strokes, and select if hit */
-	CTX_DATA_BEGIN(C, bGPDstroke *, gps, editable_gpencil_strokes)
+	GP_EDITABLE_STROKES_BEGIN(C, gpl, gps)
 	{
-		changed |= gp_stroke_do_circle_sel(gps, &gsc, mx, my, radius, select, &rect);
+		changed |= gp_stroke_do_circle_sel(
+			gps, &gsc, mx, my, radius, select, &rect,
+			(gpl->parent != NULL), diff_mat);
 	}
-	CTX_DATA_END;
-	
+	GP_EDITABLE_STROKES_END;
+
 	/* updates */
 	if (changed) {
 		WM_event_add_notifier(C, NC_GPENCIL | NA_SELECTED, NULL);
@@ -818,17 +838,25 @@ static int gpencil_border_select_exec(bContext *C, wmOperator *op)
 	WM_operator_properties_border_to_rcti(op, &rect);
 	
 	/* select/deselect points */
-	CTX_DATA_BEGIN(C, bGPDstroke *, gps, editable_gpencil_strokes)
+	GP_EDITABLE_STROKES_BEGIN(C, gpl, gps)
 	{
+
 		bGPDspoint *pt;
 		int i;
-		
+
 		for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
 			int x0, y0;
-			
+
 			/* convert point coords to screenspace */
-			gp_point_to_xy(&gsc, gps, pt, &x0, &y0);
-			
+			if (gpl->parent == NULL) {
+				gp_point_to_xy(&gsc, gps, pt, &x0, &y0);
+			}
+			else {
+				bGPDspoint pt2;
+				gp_point_to_parent_space(pt, diff_mat, &pt2);
+				gp_point_to_xy(&gsc, gps, &pt2, &x0, &y0);
+			}
+
 			/* test if in selection rect */
 			if ((!ELEM(V2D_IS_CLIPPED, x0, y0)) && BLI_rcti_isect_pt(&rect, x0, y0)) {
 				if (select) {
@@ -837,16 +865,16 @@ static int gpencil_border_select_exec(bContext *C, wmOperator *op)
 				else {
 					pt->flag &= ~GP_SPOINT_SELECT;
 				}
-				
+
 				changed = true;
 			}
 		}
-		
+
 		/* Ensure that stroke selection is in sync with its points */
 		gpencil_stroke_sync_selection(gps);
 	}
-	CTX_DATA_END;
-	
+	GP_EDITABLE_STROKES_END;
+
 	/* updates */
 	if (changed) {
 		WM_event_add_notifier(C, NC_GPENCIL | NA_SELECTED, NULL);
@@ -920,20 +948,26 @@ static int gpencil_lasso_select_exec(bContext *C, wmOperator *op)
 	}
 	
 	/* select/deselect points */
-	CTX_DATA_BEGIN(C, bGPDstroke *, gps, editable_gpencil_strokes)
+	GP_EDITABLE_STROKES_BEGIN(C, gpl, gps)
 	{
 		bGPDspoint *pt;
 		int i;
-		
+
 		for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
 			int x0, y0;
-			
+
 			/* convert point coords to screenspace */
-			gp_point_to_xy(&gsc, gps, pt, &x0, &y0);
-			
+			if (gpl->parent == NULL) {
+				gp_point_to_xy(&gsc, gps, pt, &x0, &y0);
+			}
+			else {
+				bGPDspoint pt2;
+				gp_point_to_parent_space(pt, diff_mat, &pt2);
+				gp_point_to_xy(&gsc, gps, &pt2, &x0, &y0);
+			}
 			/* test if in lasso boundbox + within the lasso noose */
 			if ((!ELEM(V2D_IS_CLIPPED, x0, y0)) && BLI_rcti_isect_pt(&rect, x0, y0) &&
-			    BLI_lasso_is_point_inside(mcords, mcords_tot, x0, y0, INT_MAX))
+				BLI_lasso_is_point_inside(mcords, mcords_tot, x0, y0, INT_MAX))
 			{
 				if (select) {
 					pt->flag |= GP_SPOINT_SELECT;
@@ -941,16 +975,16 @@ static int gpencil_lasso_select_exec(bContext *C, wmOperator *op)
 				else {
 					pt->flag &= ~GP_SPOINT_SELECT;
 				}
-				
+
 				changed = true;
 			}
 		}
-		
+
 		/* Ensure that stroke selection is in sync with its points */
 		gpencil_stroke_sync_selection(gps);
 	}
-	CTX_DATA_END;
-	
+	GP_EDITABLE_STROKES_END;
+
 	/* cleanup */
 	MEM_freeN((void *)mcords);
 	
@@ -1020,35 +1054,42 @@ static int gpencil_select_exec(bContext *C, wmOperator *op)
 	
 	/* First Pass: Find stroke point which gets hit */
 	/* XXX: maybe we should go from the top of the stack down instead... */
-	CTX_DATA_BEGIN(C, bGPDstroke *, gps, editable_gpencil_strokes)
+	GP_EDITABLE_STROKES_BEGIN(C, gpl, gps)
 	{
 		bGPDspoint *pt;
 		int i;
-		
+
 		/* firstly, check for hit-point */
 		for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
 			int xy[2];
-			
-			gp_point_to_xy(&gsc, gps, pt, &xy[0], &xy[1]);
-		
+
+			if (gpl->parent == NULL) {
+				gp_point_to_xy(&gsc, gps, pt, &xy[0], &xy[1]);
+			}
+			else {
+				bGPDspoint pt2;
+				gp_point_to_parent_space(pt, diff_mat, &pt2);
+				gp_point_to_xy(&gsc, gps, &pt2, &xy[0], &xy[1]);
+			}
+
 			/* do boundbox check first */
 			if (!ELEM(V2D_IS_CLIPPED, xy[0], xy[1])) {
 				const int pt_distance = len_manhattan_v2v2_int(mval, xy);
-				
+
 				/* check if point is inside */
 				if (pt_distance <= radius_squared) {
 					/* only use this point if it is a better match than the current hit - T44685 */
 					if (pt_distance < hit_distance) {
 						hit_stroke = gps;
-						hit_point  = pt;
+						hit_point = pt;
 						hit_distance = pt_distance;
 					}
 				}
 			}
 		}
 	}
-	CTX_DATA_END;
-	
+	GP_EDITABLE_STROKES_END;
+
 	/* Abort if nothing hit... */
 	if (ELEM(NULL, hit_stroke, hit_point)) {
 		return OPERATOR_CANCELLED;
diff --git a/source/blender/editors/gpencil/gpencil_undo.c b/source/blender/editors/gpencil/gpencil_undo.c
index f9b479ca03d..1d7582eb18b 100644
--- a/source/blender/editors/gpencil/gpencil_undo.c
+++ b/source/blender/editors/gpencil/gpencil_undo.c
@@ -142,7 +142,7 @@ void gpencil_undo_push(bGPdata *gpd)
 			 */
 			undo_node->gpd->adt = NULL;
 			
-			BKE_gpencil_free(undo_node->gpd);
+			BKE_gpencil_free(undo_node->gpd, false);
 			MEM_freeN(undo_node->gpd);
 			
 			BLI_freelinkN(&undo_nodes, undo_node);
@@ -170,7 +170,7 @@ void gpencil_undo_finish(void)
 		 */
 		undo_node->gpd->adt = NULL;
 		
-		BKE_gpencil_free(undo_node->gpd);
+		BKE_gpencil_free(undo_node->gpd, false);
 		MEM_freeN(undo_node->gpd);
 		
 		undo_node = undo_node->next;
diff --git a/source/blender/editors/gpencil/gpencil_utils.c b/source/blender/editors/gpencil/gpencil_utils.c
index d62625baaa4..f2c542da0aa 100644
--- a/source/blender/editors/gpencil/gpencil_utils.c
+++ b/source/blender/editors/gpencil/gpencil_utils.c
@@ -17,7 +17,7 @@
  *
  * The Original Code is Copyright (C) 2014, Blender Foundation
  *
- * Contributor(s): Joshua Leung
+ * Contributor(s): Joshua Leung, Antonio Vazquez
  *
  * ***** END GPL LICENSE BLOCK *****
  */
@@ -32,9 +32,13 @@
 #include <stddef.h>
 #include <math.h>
 
+#include "MEM_guardedalloc.h"
+
 #include "BLI_math.h"
 #include "BLI_blenlib.h"
 #include "BLI_utildefines.h"
+#include "BLT_translation.h"
+#include "BLI_rand.h"
 
 #include "DNA_gpencil_types.h"
 #include "DNA_object_types.h"
@@ -46,6 +50,7 @@
 #include "BKE_context.h"
 #include "BKE_gpencil.h"
 #include "BKE_tracking.h"
+#include "BKE_action.h"
 
 #include "WM_api.h"
 
@@ -269,6 +274,34 @@ int gp_active_layer_poll(bContext *C)
 	return (gpl != NULL);
 }
 
+/* poll callback for checking if there is an active brush */
+int gp_active_brush_poll(bContext *C)
+{
+	ToolSettings *ts = CTX_data_tool_settings(C);
+	bGPDbrush *brush = gpencil_brush_getactive(ts);
+
+	return (brush != NULL);
+}
+
+/* poll callback for checking if there is an active palette */
+int gp_active_palette_poll(bContext *C)
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette = gpencil_palette_getactive(gpd);
+
+	return (palette != NULL);
+}
+
+/* poll callback for checking if there is an active palette color */
+int gp_active_palettecolor_poll(bContext *C)
+{
+	bGPdata *gpd = ED_gpencil_data_get_active(C);
+	bGPDpalette *palette = gpencil_palette_getactive(gpd);
+	bGPDpalettecolor *palcolor = gpencil_palettecolor_getactive(palette);
+
+	return (palcolor != NULL);
+}
+
 /* ******************************************************** */
 /* Dynamic Enums of GP Layers */
 /* NOTE: These include an option to create a new layer and use that... */
@@ -412,6 +445,60 @@ bool ED_gpencil_stroke_can_use(const bContext *C, const bGPDstroke *gps)
 	return ED_gpencil_stroke_can_use_direct(sa, gps);
 }
 
+/* Check whether given stroke can be edited for the current color */
+bool ED_gpencil_stroke_color_use(const bGPDlayer *gpl, const bGPDstroke *gps)
+{
+	/* check if the color is editable */
+	bGPDpalettecolor *palcolor = gps->palcolor;
+	if (palcolor != NULL) {
+		if (palcolor->flag & PC_COLOR_HIDE)
+			return false;
+		if (((gpl->flag & GP_LAYER_UNLOCK_COLOR) == 0) && (palcolor->flag & PC_COLOR_LOCKED))
+			return false;
+	}
+	
+	return true;
+}
+
+/* Get palette color or create a new one */
+bGPDpalettecolor *ED_gpencil_stroke_getcolor(bGPdata *gpd, bGPDstroke *gps)
+{
+	bGPDpalette *palette;
+	bGPDpalettecolor *palcolor;
+
+	if ((gps->palcolor != NULL) && ((gps->flag & GP_STROKE_RECALC_COLOR) == 0))
+		return gps->palcolor;
+
+	/* get palette */
+	palette = gpencil_palette_getactive(gpd);
+	if (palette == NULL) {
+		palette = gpencil_palette_addnew(gpd, DATA_("GP_Palette"), true);
+	}
+	/* get color */
+	palcolor = gpencil_palettecolor_getbyname(palette, gps->colorname);
+	if (palcolor == NULL) {
+		if (gps->palcolor == NULL) {
+			palcolor = gpencil_palettecolor_addnew(palette, DATA_("Color"), true);
+			/* set to a different color */
+			ARRAY_SET_ITEMS(palcolor->color, 1.0f, 0.0f, 1.0f, 0.9f);
+		}
+		else {
+			palcolor = gpencil_palettecolor_addnew(palette, gps->colorname, true);
+			/* set old color and attributes */
+			bGPDpalettecolor *gpscolor = gps->palcolor;
+			copy_v4_v4(palcolor->color, gpscolor->color);
+			copy_v4_v4(palcolor->fill, gpscolor->fill);
+			palcolor->flag = gpscolor->flag;
+		}
+	}
+
+	/* clear flag and set pointer */
+	gps->flag &= ~GP_STROKE_RECALC_COLOR;
+	gps->palcolor = palcolor;
+
+	return palcolor;
+}
+
 /* ******************************************************** */
 /* Space Conversion */
 
@@ -451,6 +538,50 @@ void gp_point_conversion_init(bContext *C, GP_SpaceConversion *r_gsc)
 	}
 }
 
+/* convert point to parent space */
+void gp_point_to_parent_space(bGPDspoint *pt, float diff_mat[4][4], bGPDspoint *r_pt) 
+{
+	float fpt[3];
+
+	mul_v3_m4v3(fpt, diff_mat, &pt->x);
+	copy_v3_v3(&r_pt->x, fpt);
+}
+
+/* Change position relative to parent object */
+void gp_apply_parent(bGPDlayer *gpl, bGPDstroke *gps)
+{
+	bGPDspoint *pt;
+	int i;
+
+	/* undo matrix */
+	float diff_mat[4][4];
+	float inverse_diff_mat[4][4];
+	float fpt[3];
+
+	ED_gpencil_parent_location(gpl, diff_mat);
+	invert_m4_m4(inverse_diff_mat, diff_mat);
+
+	for (i = 0; i < gps->totpoints; i++) {
+		pt = &gps->points[i];
+		mul_v3_m4v3(fpt, inverse_diff_mat, &pt->x);
+		copy_v3_v3(&pt->x, fpt);
+	}
+}
+
+/* Change point position relative to parent object */
+void gp_apply_parent_point(bGPDlayer *gpl, bGPDspoint *pt)
+{
+	/* undo matrix */
+	float diff_mat[4][4];
+	float inverse_diff_mat[4][4];
+	float fpt[3];
+
+	ED_gpencil_parent_location(gpl, diff_mat);
+	invert_m4_m4(inverse_diff_mat, diff_mat);
+
+	mul_v3_m4v3(fpt, inverse_diff_mat, &pt->x);
+	copy_v3_v3(&pt->x, fpt);
+}
 
 /* Convert Grease Pencil points to screen-space values
  * WARNING: This assumes that the caller has already checked whether the stroke in question can be drawn
@@ -591,25 +722,107 @@ bool gp_smooth_stroke(bGPDstroke *gps, int i, float inf, bool affect_pressure)
 			madd_v3_v3fl(sco, &pt1->x, average_fac);
 			madd_v3_v3fl(sco, &pt2->x, average_fac);
 			
+#if 0
+			/* XXX: Disabled because get weird result */
 			/* do pressure too? */
 			if (affect_pressure) {
 				pressure += pt1->pressure * average_fac;
 				pressure += pt2->pressure * average_fac;
 			}
+#endif
 		}
 	}
 	
 	/* Based on influence factor, blend between original and optimal smoothed coordinate */
 	interp_v3_v3v3(&pt->x, &pt->x, sco, inf);
 	
+#if 0
+	/* XXX: Disabled because get weird result */
 	if (affect_pressure) {
 		pt->pressure = pressure;
 	}
+#endif
 	
 	return true;
 }
 
 /**
+* Apply smooth for strength to stroke point
+* \param gps              Stroke to smooth
+* \param i                Point index
+* \param inf              Amount of smoothing to apply
+*/
+bool gp_smooth_stroke_strength(bGPDstroke *gps, int i, float inf)
+{
+	bGPDspoint *ptb = &gps->points[i];
+
+	/* Do nothing if not enough points */
+	if (gps->totpoints <= 2) {
+		return false;
+	}
+
+	/* Compute theoretical optimal value using distances */
+	bGPDspoint *pta, *ptc;
+	int before = i - 1;
+	int after = i + 1;
+
+	CLAMP_MIN(before, 0);
+	CLAMP_MAX(after, gps->totpoints - 1);
+
+	pta = &gps->points[before];
+	ptc = &gps->points[after];
+
+	/* the optimal value is the corresponding to the interpolation of the strength
+	*  at the distance of point b
+	*/
+	const float fac = line_point_factor_v3(&ptb->x, &pta->x, &ptc->x);
+	const float optimal = (1.0f - fac) * pta->strength + fac * ptc->strength;
+
+	/* Based on influence factor, blend between original and optimal */
+	ptb->strength = (1.0f - inf) * ptb->strength + inf * optimal;
+
+	return true;
+}
+
+/**
+* Apply smooth for thickness to stroke point (use pressure)
+* \param gps              Stroke to smooth
+* \param i                Point index
+* \param inf              Amount of smoothing to apply
+*/
+bool gp_smooth_stroke_thickness(bGPDstroke *gps, int i, float inf)
+{
+	bGPDspoint *ptb = &gps->points[i];
+
+	/* Do nothing if not enough points */
+	if (gps->totpoints <= 2) {
+		return false;
+	}
+
+	/* Compute theoretical optimal value using distances */
+	bGPDspoint *pta, *ptc;
+	int before = i - 1;
+	int after = i + 1;
+
+	CLAMP_MIN(before, 0);
+	CLAMP_MAX(after, gps->totpoints - 1);
+
+	pta = &gps->points[before];
+	ptc = &gps->points[after];
+
+	/* the optimal value is the corresponding to the interpolation of the pressure
+	*  at the distance of point b
+	*/
+	float fac = line_point_factor_v3(&ptb->x, &pta->x, &ptc->x);
+	float optimal = (1.0f - fac) * pta->pressure + fac * ptc->pressure;
+
+	/* Based on influence factor, blend between original and optimal */
+	ptb->pressure = (1.0f - inf) * ptb->pressure + inf * optimal;
+
+	return true;
+}
+
+/**
  * Subdivide a stroke once, by adding a point half way between each pair of existing points
  * \param gps           Stroke data
  * \param new_totpoints Total number of points (after subdividing)
@@ -633,16 +846,99 @@ void gp_subdivide_stroke(bGPDstroke *gps, const int new_totpoints)
 		interp_v3_v3v3(&pt->x, &prev->x, &next->x, 0.5f);
 		
 		pt->pressure = interpf(prev->pressure, next->pressure, 0.5f);
-		pt->time     = interpf(prev->time, next->time, 0.5f);
+		pt->strength = interpf(prev->strength, next->strength, 0.5f);
+		CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);
+		pt->time = interpf(prev->time, next->time, 0.5f);
 	}
 	
 	/* Update to new total number of points */
 	gps->totpoints = new_totpoints;
 }
 
-/* ******************************************************** */
+/**
+ * Add randomness to stroke
+ * \param gps           Stroke data
+ * \param brsuh         Brush data
+ */
+void gp_randomize_stroke(bGPDstroke *gps, bGPDbrush *brush)
+{
+	bGPDspoint *pt1, *pt2, *pt3;
+	float v1[3];
+	float v2[3];
+	if (gps->totpoints < 3) {
+		return;
+	}
+
+	/* get two vectors using 3 points */
+	pt1 = &gps->points[0];
+	pt2 = &gps->points[1];
+	pt3 = &gps->points[(int)(gps->totpoints * 0.75)];
+
+	sub_v3_v3v3(v1, &pt2->x, &pt1->x);
+	sub_v3_v3v3(v2, &pt3->x, &pt2->x);
+	normalize_v3(v1);
+	normalize_v3(v2);
+
+	/* get normal vector to plane created by two vectors */
+	float normal[3];
+	cross_v3_v3v3(normal, v1, v2);
+	normalize_v3(normal);
+	/* get orthogonal vector to plane to rotate random effect */
+	float ortho[3];
+	cross_v3_v3v3(ortho, v1, normal);
+	normalize_v3(ortho);
+	/* Read all points and apply shift vector (first and last point not modified) */
+	for (int i = 1; i < gps->totpoints - 1; ++i) {
+		bGPDspoint *pt = &gps->points[i];
+		/* get vector with shift (apply a division because random is too sensitive */
+		const float fac = BLI_frand() * (brush->draw_random_sub / 10.0f);
+		float svec[3];
+		copy_v3_v3(svec, ortho);
+		if (BLI_frand() > 0.5f) {
+			mul_v3_fl(svec, -fac);
+		}
+		else {
+			mul_v3_fl(svec, fac);
+		}
+
+		/* apply shift */
+		add_v3_v3(&pt->x, svec);
+	}
+
+}
+/* calculate difference matrix */
+void ED_gpencil_parent_location(bGPDlayer *gpl, float diff_mat[4][4])
+{
+	Object *ob = gpl->parent;
 
+	if (ob == NULL) {
+		unit_m4(diff_mat);
+		return;
+	}
+	else {
+		if ((gpl->partype == PAROBJECT) || (gpl->partype == PARSKEL)) {
+			mul_m4_m4m4(diff_mat, ob->obmat, gpl->inverse);
+			return;
+		}
+		else if (gpl->partype == PARBONE) {
+			bPoseChannel *pchan = BKE_pose_channel_find_name(ob->pose, gpl->parsubstr);
+			if (pchan) {
+				float tmp_mat[4][4];
+				mul_m4_m4m4(tmp_mat, ob->obmat, pchan->pose_mat);
+				mul_m4_m4m4(diff_mat, tmp_mat, gpl->inverse);
+			}
+			else {
+				mul_m4_m4m4(diff_mat, ob->obmat, gpl->inverse); /* if bone not found use object (armature) */
+			}
+			return;
+		}
+		else {
+			unit_m4(diff_mat); /* not defined type */
+		}
+	}
+}
 
+/* ******************************************************** */
 bool ED_gpencil_stroke_minmax(
         const bGPDstroke *gps, const bool use_select,
         float r_min[3], float r_max[3])
@@ -659,3 +955,74 @@ bool ED_gpencil_stroke_minmax(
 	}
 	return changed;
 }
+/* Dynamic Enums of GP Brushes */
+
+EnumPropertyItem *ED_gpencil_brushes_enum_itemf(
+        bContext *C, PointerRNA *UNUSED(ptr), PropertyRNA *UNUSED(prop),
+        bool *r_free)
+{
+	ToolSettings *ts = CTX_data_tool_settings(C);
+	bGPDbrush *brush;
+	EnumPropertyItem *item = NULL, item_tmp = { 0 };
+	int totitem = 0;
+	int i = 0;
+
+	if (ELEM(NULL, C, ts)) {
+		return DummyRNA_DEFAULT_items;
+	}
+
+	/* Existing brushes */
+	for (brush = ts->gp_brushes.first; brush; brush = brush->next, i++) {
+		item_tmp.identifier = brush->info;
+		item_tmp.name = brush->info;
+		item_tmp.value = i;
+
+		if (brush->flag & GP_BRUSH_ACTIVE)
+			item_tmp.icon = ICON_BRUSH_DATA;
+		else
+			item_tmp.icon = ICON_NONE;
+
+		RNA_enum_item_add(&item, &totitem, &item_tmp);
+	}
+
+	RNA_enum_item_end(&item, &totitem);
+	*r_free = true;
+
+	return item;
+}
+/* Dynamic Enums of GP Palettes */
+
+EnumPropertyItem *ED_gpencil_palettes_enum_itemf(
+        bContext *C, PointerRNA *UNUSED(ptr), PropertyRNA *UNUSED(prop),
+        bool *r_free)
+{
+	bGPdata *gpd = CTX_data_gpencil_data(C);
+	bGPDpalette *palette;
+	EnumPropertyItem *item = NULL, item_tmp = { 0 };
+	int totitem = 0;
+	int i = 0;
+
+	if (ELEM(NULL, C, gpd)) {
+		return DummyRNA_DEFAULT_items;
+	}
+
+	/* Existing palettes */
+	for (palette = gpd->palettes.first; palette; palette = palette->next, i++) {
+		item_tmp.identifier = palette->info;
+		item_tmp.name = palette->info;
+		item_tmp.value = i;
+
+		if (palette->flag & PL_PALETTE_ACTIVE)
+			item_tmp.icon = ICON_COLOR;
+		else
+			item_tmp.icon = ICON_NONE;
+
+		RNA_enum_item_add(&item, &totitem, &item_tmp);
+	}
+
+	RNA_enum_item_end(&item, &totitem);
+	*r_free = true;
+
+	return item;
+}
+/* ******************************************************** */
diff --git a/source/blender/editors/include/ED_gpencil.h b/source/blender/editors/include/ED_gpencil.h
index de5ab80a88f..d526b0841cc 100644
--- a/source/blender/editors/include/ED_gpencil.h
+++ b/source/blender/editors/include/ED_gpencil.h
@@ -41,6 +41,8 @@ struct bGPdata;
 struct bGPDlayer;
 struct bGPDframe;
 struct bGPDstroke;
+struct bGPDpalette;
+struct bGPDpalettecolor;
 struct bAnimContext;
 struct KeyframeEditData;
 struct PointerRNA;
@@ -57,6 +59,7 @@ struct wmKeyConfig;
 typedef struct tGPspoint {
 	int x, y;               /* x and y coordinates of cursor (in relative to area) */
 	float pressure;         /* pressure of tablet at this point */
+	float strength;         /* pressure of tablet at this point for alpha factor */
 	float time;             /* Time relative to stroke start (used when converting to path) */
 } tGPspoint;
 
@@ -86,6 +89,9 @@ bool ED_gpencil_has_keyframe_v3d(struct Scene *scene, struct Object *ob, int cfr
 
 bool ED_gpencil_stroke_can_use_direct(const struct ScrArea *sa, const struct bGPDstroke *gps);
 bool ED_gpencil_stroke_can_use(const struct bContext *C, const struct bGPDstroke *gps);
+bool ED_gpencil_stroke_color_use(const struct bGPDlayer *gpl, const struct bGPDstroke *gps);
+
+struct bGPDpalettecolor *ED_gpencil_stroke_getcolor(struct bGPdata *gpd, struct bGPDstroke *gps);
 
 bool ED_gpencil_stroke_minmax(
         const struct bGPDstroke *gps, const bool use_select,
@@ -142,4 +148,10 @@ bool ED_gpencil_anim_copybuf_paste(struct bAnimContext *ac, const short copy_mod
 int ED_gpencil_session_active(void);
 int ED_undo_gpencil_step(struct bContext *C, int step, const char *name);
 
+/* ------------ Transformation Utilities ------------ */
+
+/* get difference matrix using parent */
+void ED_gpencil_parent_location(struct bGPDlayer *gpl, float diff_mat[4][4]);
+
+
 #endif /*  __ED_GPENCIL_H__ */
diff --git a/source/blender/editors/include/UI_icons.h b/source/blender/editors/include/UI_icons.h
index d85b60dcc43..e016e014a1a 100644
--- a/source/blender/editors/include/UI_icons.h
+++ b/source/blender/editors/include/UI_icons.h
@@ -320,9 +320,9 @@ DEF_ICON(OUTLINER_OB_SPEAKER)
 	DEF_ICON(BLANK123)
 	DEF_ICON(BLANK124)
 	DEF_ICON(BLANK125)
-	DEF_ICON(BLANK126)
-	DEF_ICON(BLANK127)
 #endif
+DEF_ICON(RESTRICT_COLOR_OFF)
+DEF_ICON(RESTRICT_COLOR_ON)
 DEF_ICON(RESTRICT_VIEW_OFF)
 DEF_ICON(RESTRICT_VIEW_ON)
 DEF_ICON(RESTRICT_SELECT_OFF)
diff --git a/source/blender/editors/object/object_add.c b/source/blender/editors/object/object_add.c
index cc628210e20..a8b0c28599d 100644
--- a/source/blender/editors/object/object_add.c
+++ b/source/blender/editors/object/object_add.c
@@ -48,6 +48,7 @@
 #include "DNA_scene_types.h"
 #include "DNA_vfont_types.h"
 #include "DNA_actuator_types.h"
+#include "DNA_gpencil_types.h"
 
 #include "BLI_utildefines.h"
 #include "BLI_ghash.h"
@@ -1145,10 +1146,22 @@ static int object_delete_exec(bContext *C, wmOperator *op)
 		}
 		else if (is_indirectly_used && ID_REAL_USERS(base->object) <= 1) {
 			BKE_reportf(op->reports, RPT_WARNING,
-			            "Cannot delete object '%s' from scene '%s', indirectly used objects need at least one user",
-			            base->object->id.name + 2, scene->id.name + 2);
+			        "Cannot delete object '%s' from scene '%s', indirectly used objects need at least one user",
+			        base->object->id.name + 2, scene->id.name + 2);
 			continue;
 		}
+		/* remove from Grease Pencil parent */
+		for (bGPdata *gpd = bmain->gpencil.first; gpd; gpd = gpd->id.next) {
+			for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+				if (gpl->parent != NULL) {
+					Object *ob = gpl->parent;
+					Object *curob = base->object;
+					if (ob == curob) {
+						gpl->parent = NULL;
+					}
+				}
+			}
+		}
 
 		/* deselect object -- it could be used in other scenes */
 		base->object->flag &= ~SELECT;
diff --git a/source/blender/editors/object/object_relations.c b/source/blender/editors/object/object_relations.c
index b3edf1f5e0d..ff2accf9d82 100644
--- a/source/blender/editors/object/object_relations.c
+++ b/source/blender/editors/object/object_relations.c
@@ -48,6 +48,7 @@
 #include "DNA_world_types.h"
 #include "DNA_object_types.h"
 #include "DNA_vfont_types.h"
+#include "DNA_gpencil_types.h"
 
 #include "BLI_math.h"
 #include "BLI_listbase.h"
@@ -1762,6 +1763,14 @@ static void single_object_users(Main *bmain, Scene *scene, View3D *v3d, const in
 				else {
 					/* copy already clears */
 				}
+				/* remap gpencil parenting */
+				bGPdata *gpd = scene->gpd;
+				for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+					if (gpl->parent == ob) {
+						gpl->parent = obn;
+					}
+				}
+
 				base->flag = obn->flag;
 
 				id_us_min(&ob->id);
diff --git a/source/blender/editors/render/render_opengl.c b/source/blender/editors/render/render_opengl.c
index 992b827113d..85c05ab0e5c 100644
--- a/source/blender/editors/render/render_opengl.c
+++ b/source/blender/editors/render/render_opengl.c
@@ -43,6 +43,7 @@
 
 #include "DNA_scene_types.h"
 #include "DNA_object_types.h"
+#include "DNA_gpencil_types.h"
 
 #include "BKE_camera.h"
 #include "BKE_context.h"
@@ -414,6 +415,99 @@ static void screen_opengl_render_write(OGLRender *oglrender)
 	else printf("OpenGL Render failed to write '%s'\n", name);
 }
 
+static void addAlphaOverFloat(float dest[4], const float source[4])
+{
+	/* d = s + (1-alpha_s)d*/
+	float mul;
+
+	mul = 1.0f - source[3];
+
+	dest[0] = (mul * dest[0]) + source[0];
+	dest[1] = (mul * dest[1]) + source[1];
+	dest[2] = (mul * dest[2]) + source[2];
+	dest[3] = (mul * dest[3]) + source[3];
+
+}
+
+/* add renderlayer and renderpass for each grease pencil layer for using in composition */
+static void add_gpencil_renderpass(OGLRender *oglrender, RenderResult *rr, RenderView *rv)
+{
+	bGPdata *gpd = oglrender->scene->gpd;
+	Scene *scene = oglrender->scene;
+
+	/* sanity checks */
+	if (gpd == NULL) {
+		return;
+	}
+	if (scene == NULL) {
+		return;
+	}
+	if (BLI_listbase_is_empty(&gpd->layers)) {
+		return;
+	}
+
+	/* save old alpha mode */
+	short oldalphamode = scene->r.alphamode;
+	/* set alpha transparent for gp */
+	scene->r.alphamode = R_ALPHAPREMUL;
+	
+	/* saves layer status */
+	short *oldsts = MEM_mallocN(BLI_listbase_count(&gpd->layers) * sizeof(short), "temp_gplayers_flag");
+	int i = 0;
+	for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+		oldsts[i] = gpl->flag;
+		++i;
+	}
+	/* loop all layers to create separate render */
+	for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+		/* dont draw layer if hidden */
+		if (gpl->flag & GP_LAYER_HIDE)
+			continue;
+		/* hide all layer except current */
+		for (bGPDlayer *gph = gpd->layers.first; gph; gph = gph->next) {
+			if (gpl != gph) {
+				gph->flag |= GP_LAYER_HIDE;
+			}
+		}
+
+		/* render this gp layer */
+		screen_opengl_render_doit(oglrender, rr);
+		
+		/* add RendePass composite */
+		RenderPass *rp = RE_create_gp_pass(rr, gpl->info, rv->name);
+
+		/* copy image data from rectf */
+		float *src = RE_RenderViewGetById(rr, oglrender->view_id)->rectf;
+		float *dest = rp->rect;
+
+		float *pixSrc, *pixDest;
+		int x, y, rectx, recty;
+		rectx = rr->rectx;
+		recty = rr->recty;
+		for (y = 0; y < recty; y++) {
+			for (x = 0; x < rectx; x++) {
+				pixSrc = src + 4 * (rectx * y + x);
+				if (pixSrc[3] > 0.0) {
+					pixDest = dest + 4 * (rectx * y + x);
+					addAlphaOverFloat(pixDest, pixSrc);
+				}
+			}
+		}
+
+		/* back layer status */
+		i = 0;
+		for (bGPDlayer *gph = gpd->layers.first; gph; gph = gph->next) {
+			gph->flag = oldsts[i];
+			++i;
+		}
+	}
+	/* free memory */
+	MEM_freeN(oldsts);
+
+	/* back default alpha mode */
+	scene->r.alphamode = oldalphamode;
+}
+
 static void screen_opengl_render_apply(OGLRender *oglrender)
 {
 	RenderResult *rr;
@@ -449,6 +543,9 @@ static void screen_opengl_render_apply(OGLRender *oglrender)
 		BLI_assert(view_id < oglrender->views_len);
 		RE_SetActiveRenderView(oglrender->re, rv->name);
 		oglrender->view_id = view_id;
+		/* add grease pencil passes */
+		add_gpencil_renderpass(oglrender, rr, rv);
+		/* render composite */
 		screen_opengl_render_doit(oglrender, rr);
 	}
 
diff --git a/source/blender/editors/screen/screen_context.c b/source/blender/editors/screen/screen_context.c
index f61ad348501..22d95d77d55 100644
--- a/source/blender/editors/screen/screen_context.c
+++ b/source/blender/editors/screen/screen_context.c
@@ -85,7 +85,8 @@ const char *screen_context_dir[] = {
 	"sequences", "selected_sequences", "selected_editable_sequences", /* sequencer */
 	"gpencil_data", "gpencil_data_owner", /* grease pencil data */
 	"visible_gpencil_layers", "editable_gpencil_layers", "editable_gpencil_strokes",
-	"active_gpencil_layer", "active_gpencil_frame",
+	"active_gpencil_layer", "active_gpencil_frame", "active_gpencil_palette", 
+	"active_gpencil_palettecolor", "active_gpencil_brush",
 	"active_operator",
 	NULL};
 
@@ -474,6 +475,44 @@ int ed_screen_context(const bContext *C, const char *member, bContextDataResult
 			}
 		}
 	}
+	else if (CTX_data_equals(member, "active_gpencil_palette")) {
+		/* XXX: see comment for gpencil_data case... */
+		bGPdata *gpd = ED_gpencil_data_get_active_direct((ID *)sc, scene, sa, obact);
+
+		if (gpd) {
+			bGPDpalette *palette = gpencil_palette_getactive(gpd);
+
+			if (palette) {
+				CTX_data_pointer_set(result, &gpd->id, &RNA_GPencilPalette, palette);
+				return 1;
+			}
+		}
+	}
+	else if (CTX_data_equals(member, "active_gpencil_palettecolor")) {
+		/* XXX: see comment for gpencil_data case... */
+		bGPdata *gpd = ED_gpencil_data_get_active_direct((ID *)sc, scene, sa, obact);
+
+		if (gpd) {
+			bGPDpalette *palette = gpencil_palette_getactive(gpd);
+
+			if (palette) {
+				bGPDpalettecolor *palcolor = gpencil_palettecolor_getactive(palette);
+				if (palcolor) {
+					CTX_data_pointer_set(result, &gpd->id, &RNA_GPencilPaletteColor, palcolor);
+					return 1;
+				}
+			}
+		}
+	}
+	else if (CTX_data_equals(member, "active_gpencil_brush")) {
+		/* XXX: see comment for gpencil_data case... */
+		bGPDbrush *brush = gpencil_brush_getactive(scene->toolsettings);
+
+		if (brush) {
+			CTX_data_pointer_set(result, NULL, &RNA_GPencilBrush, brush);
+			return 1;
+		}
+	}
 	else if (CTX_data_equals(member, "active_gpencil_frame")) {
 		/* XXX: see comment for gpencil_data case... */
 		bGPdata *gpd = ED_gpencil_data_get_active_direct((ID *)sc, scene, sa, obact);
@@ -533,6 +572,11 @@ int ed_screen_context(const bContext *C, const char *member, bContextDataResult
 					
 					for (gps = gpf->strokes.first; gps; gps = gps->next) {
 						if (ED_gpencil_stroke_can_use_direct(sa, gps)) {
+							/* check if the color is editable */
+							if (ED_gpencil_stroke_color_use(gpl, gps) == false) {
+								continue;
+							}
+
 							CTX_data_list_add(result, &gpd->id, &RNA_GPencilStroke, gps);
 						}
 					}
diff --git a/source/blender/editors/space_node/drawnode.c b/source/blender/editors/space_node/drawnode.c
index ddbd07616bc..7b08b8368ba 100644
--- a/source/blender/editors/space_node/drawnode.c
+++ b/source/blender/editors/space_node/drawnode.c
@@ -1338,7 +1338,7 @@ static void node_composit_buts_renderlayers(uiLayout *layout, bContext *C, Point
 	
 	scn_ptr = RNA_pointer_get(ptr, "scene");
 	RNA_string_get(&scn_ptr, "name", scene_name);
-	
+
 	WM_operator_properties_create_ptr(&op_ptr, ot);
 	RNA_string_set(&op_ptr, "layer", layer_name);
 	RNA_string_set(&op_ptr, "scene", scene_name);
diff --git a/source/blender/editors/space_outliner/outliner_draw.c b/source/blender/editors/space_outliner/outliner_draw.c
index ae34a118992..b57462df53b 100644
--- a/source/blender/editors/space_outliner/outliner_draw.c
+++ b/source/blender/editors/space_outliner/outliner_draw.c
@@ -1002,7 +1002,7 @@ static void tselem_draw_icon_uibut(struct DrawIconArg *arg, int icon)
 
 }
 
-static void tselem_draw_gp_icon_uibut(struct DrawIconArg *arg, ID *id, bGPDlayer *gpl)
+static void UNUSED_FUNCTION(tselem_draw_gp_icon_uibut)(struct DrawIconArg *arg, ID *id, bGPDlayer *gpl)
 {
 	/* restrict column clip - skip it for now... */
 	if (arg->x >= arg->xmax) {
@@ -1233,9 +1233,12 @@ static void tselem_draw_icon(uiBlock *block, int xmax, float x, float y, TreeSto
 				else
 					UI_icon_draw(x, y, RNA_struct_ui_icon(te->rnaptr.type));
 				break;
+			/* Removed the icons from outliner. Need a better structure with Layers, Palettes and Colors */
+#if 0
 			case TSE_GP_LAYER:
 				tselem_draw_gp_icon_uibut(&arg, tselem->id, te->directdata);
 				break;
+#endif
 			default:
 				UI_icon_draw(x, y, ICON_DOT); break;
 		}
diff --git a/source/blender/editors/space_view3d/view3d_ruler.c b/source/blender/editors/space_view3d/view3d_ruler.c
index f46608b7d5e..a55849e5633 100644
--- a/source/blender/editors/space_view3d/view3d_ruler.c
+++ b/source/blender/editors/space_view3d/view3d_ruler.c
@@ -327,6 +327,7 @@ static bool view3d_ruler_to_gpencil(bContext *C, RulerInfo *ruler_info)
 			for (j = 0; j < 3; j++) {
 				copy_v3_v3(&pt->x, ruler_item->co[j]);
 				pt->pressure = 1.0f;
+				pt->strength = 1.0f;
 				pt++;
 			}
 		}
@@ -336,6 +337,7 @@ static bool view3d_ruler_to_gpencil(bContext *C, RulerInfo *ruler_info)
 			for (j = 0; j < 3; j += 2) {
 				copy_v3_v3(&pt->x, ruler_item->co[j]);
 				pt->pressure = 1.0f;
+				pt->strength = 1.0f;
 				pt++;
 			}
 		}
diff --git a/source/blender/editors/transform/transform_conversions.c b/source/blender/editors/transform/transform_conversions.c
index 1376b6bf4da..ad2b40bfef8 100644
--- a/source/blender/editors/transform/transform_conversions.c
+++ b/source/blender/editors/transform/transform_conversions.c
@@ -7687,7 +7687,11 @@ static void createTransGPencil(bContext *C, TransInfo *t)
 				if (ED_gpencil_stroke_can_use(C, gps) == false) {
 					continue;
 				}
-				
+				/* check if the color is editable */
+				if (ED_gpencil_stroke_color_use(gpl, gps) == false) {
+					continue;
+				}
+
 				if (is_prop_edit) {
 					/* Proportional Editing... */
 					if (is_prop_edit_connected) {
@@ -7735,14 +7739,27 @@ static void createTransGPencil(bContext *C, TransInfo *t)
 		if (gpencil_layer_is_editable(gpl) && (gpl->actframe != NULL)) {
 			bGPDframe *gpf = gpl->actframe;
 			bGPDstroke *gps;
+			float diff_mat[4][4];
+			float inverse_diff_mat[4][4];
+
+			/* calculate difference matrix if parent object */
+			if (gpl->parent != NULL) {
+				ED_gpencil_parent_location(gpl, diff_mat);
+				/* undo matrix */
+				invert_m4_m4(inverse_diff_mat, diff_mat);
+			}
 			
-			/* Make a new frame to work on if the layer's frame and the current scene frame don't match up 
+			/* Make a new frame to work on if the layer's frame and the current scene frame don't match up
 			 * - This is useful when animating as it saves that "uh-oh" moment when you realize you've
 			 *   spent too much time editing the wrong frame...
 			 */
 			// XXX: should this be allowed when framelock is enabled?
 			if (gpf->framenum != cfra) {
 				gpf = gpencil_frame_addcopy(gpl, cfra);
+				/* in some weird situations (framelock enabled) return NULL */
+				if (gpf == NULL) {
+					continue;
+				}
 			}
 			
 			/* Loop over strokes, adding TransData for points as needed... */
@@ -7755,7 +7772,10 @@ static void createTransGPencil(bContext *C, TransInfo *t)
 				if (ED_gpencil_stroke_can_use(C, gps) == false) {
 					continue;
 				}
-				
+				/* check if the color is editable */
+				if (ED_gpencil_stroke_color_use(gpl, gps) == false) {
+					continue;
+				}
 				/* What we need to include depends on proportional editing settings... */
 				if (is_prop_edit) {
 					if (is_prop_edit_connected) {
@@ -7824,9 +7844,18 @@ static void createTransGPencil(bContext *C, TransInfo *t)
 								/* screenspace */
 								td->protectflag = OB_LOCK_LOCZ | OB_LOCK_ROTZ | OB_LOCK_SCALEZ;
 								
-								copy_m3_m4(td->smtx, t->persmat);
-								copy_m3_m4(td->mtx, t->persinv);
-								unit_m3(td->axismtx);
+								/* apply parent transformations */
+								if (gpl->parent == NULL) {
+									copy_m3_m4(td->smtx, t->persmat);
+									copy_m3_m4(td->mtx, t->persinv);
+									unit_m3(td->axismtx);
+								}
+								else {
+									/* apply matrix transformation relative to parent */
+									copy_m3_m4(td->smtx, inverse_diff_mat); /* final position */
+									copy_m3_m4(td->mtx, diff_mat); /* display position */
+									copy_m3_m4(td->axismtx, diff_mat); /* axis orientation */
+								}
 							}
 							else {
 								/* configure 2D dataspace points so that they don't play up... */
@@ -7835,9 +7864,18 @@ static void createTransGPencil(bContext *C, TransInfo *t)
 									// XXX: matrices may need to be different?
 								}
 								
-								copy_m3_m3(td->smtx, smtx);
-								copy_m3_m3(td->mtx, mtx);
-								unit_m3(td->axismtx); // XXX?
+								/* apply parent transformations */
+								if (gpl->parent == NULL) {
+									copy_m3_m3(td->smtx, smtx);
+									copy_m3_m3(td->mtx, mtx);
+									unit_m3(td->axismtx); // XXX?
+								}
+								else {
+									/* apply matrix transformation relative to parent */
+									copy_m3_m4(td->smtx, inverse_diff_mat); /* final position */
+									copy_m3_m4(td->mtx, diff_mat);  /* display position */
+									copy_m3_m4(td->axismtx, diff_mat); /* axis orientation */
+								}
 							}
 							/* Triangulation must be calculated again, so save the stroke for recalc function */
 							td->extra = gps;
diff --git a/source/blender/editors/transform/transform_generics.c b/source/blender/editors/transform/transform_generics.c
index 728b10f5e6f..f78a23be7b8 100644
--- a/source/blender/editors/transform/transform_generics.c
+++ b/source/blender/editors/transform/transform_generics.c
@@ -975,7 +975,9 @@ static void recalcData_gpencil_strokes(TransInfo *t)
 	TransData *td = t->data;
 	for (int i = 0; i < t->total; i++, td++) {
 		bGPDstroke *gps = td->extra;
-		gps->flag |= GP_STROKE_RECALC_CACHES;
+		if (gps != NULL) {
+			gps->flag |= GP_STROKE_RECALC_CACHES;
+		}
 	}
 }
 
diff --git a/source/blender/editors/transform/transform_manipulator.c b/source/blender/editors/transform/transform_manipulator.c
index 309ad22e31c..075f311db72 100644
--- a/source/blender/editors/transform/transform_manipulator.c
+++ b/source/blender/editors/transform/transform_manipulator.c
@@ -58,6 +58,7 @@
 #include "BKE_pointcache.h"
 #include "BKE_editmesh.h"
 #include "BKE_lattice.h"
+#include "BKE_gpencil.h"
 
 #include "BIF_gl.h"
 
@@ -68,6 +69,7 @@
 #include "ED_curve.h"
 #include "ED_particle.h"
 #include "ED_view3d.h"
+#include "ED_gpencil.h"
 
 #include "UI_resources.h"
 
@@ -288,24 +290,49 @@ static int calc_manipulator_stats(const bContext *C)
 	zero_v3(scene->twcent);
 	
 	if (is_gp_edit) {
-		CTX_DATA_BEGIN(C, bGPDstroke *, gps, editable_gpencil_strokes)
-		{
-			/* we're only interested in selected points here... */
-			if (gps->flag & GP_STROKE_SELECT) {
-				bGPDspoint *pt;
-				int i;
-				
-				/* Change selection status of all points, then make the stroke match */
-				for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
-					if (pt->flag & GP_SPOINT_SELECT) {
-						calc_tw_center(scene, &pt->x);
-						totsel++;
+		float diff_mat[4][4];
+		float fpt[3];
+
+		for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+			/* only editable and visible layers are considered */
+			if (gpencil_layer_is_editable(gpl) && (gpl->actframe != NULL)) {
+
+				/* calculate difference matrix if parent object */
+				if (gpl->parent != NULL) {
+					ED_gpencil_parent_location(gpl, diff_mat);
+				}
+
+				for (bGPDstroke *gps = gpl->actframe->strokes.first; gps; gps = gps->next) {
+					/* skip strokes that are invalid for current view */
+					if (ED_gpencil_stroke_can_use(C, gps) == false) {
+						continue;
+					}
+
+					/* we're only interested in selected points here... */
+					if (gps->flag & GP_STROKE_SELECT) {
+						bGPDspoint *pt;
+						int i;
+
+						/* Change selection status of all points, then make the stroke match */
+						for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
+							if (pt->flag & GP_SPOINT_SELECT) {
+								if (gpl->parent == NULL) {
+									calc_tw_center(scene, &pt->x);
+									totsel++;
+								}
+								else {
+									mul_v3_m4v3(fpt, diff_mat, &pt->x);
+									calc_tw_center(scene, fpt);
+									totsel++;
+								}
+							}
+						}
 					}
 				}
 			}
 		}
-		CTX_DATA_END;
-		
+
+
 		/* selection center */
 		if (totsel) {
 			mul_v3_fl(scene->twcent, 1.0f / (float)totsel);   /* centroid! */