GP: New Cutter, Constraints and Segment selection

This commit groups a set of new tools that were tested in grease pencil object branch before moving to master. We decide to do all the development in a separated branch because it could break master during days or weeks before the new tools were ready to deploy.

The commit includes:

- New Cutter tool to trim strokes and help cleaning up drawings.

- New set of constraints and guides to draw different types of shapes. All the credits for this development goes to Charlie Jolly (@charlie), thanks for your help!

- Segment selection mode to select strokes between intersections.

- New operator to change strokes cap mode.

- New option to display only keyframed frames. This option is very important when fill strokes with color.

- Multiple small fixes and tweaks.

Thanks to @pepeland and @mendio for their ideas, tests, reviews and support.

Note: Still pending the final icons for Cutter in Toolbar and Segment Selection in Topbar. @billreynish could help us here?

1 files changed, 13 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_gpencil_types.h b/source/blender/makesdna/DNA_gpencil_types.h
index 0ae193752a8..17813021fdf 100644
--- a/source/blender/makesdna/DNA_gpencil_types.h
+++ b/source/blender/makesdna/DNA_gpencil_types.h
@@ -203,7 +203,8 @@ typedef struct bGPDstroke {
 
 	/** Material index. */
 	int mat_nr;
-	char _pad1[4];
+	/** Caps mode for each stroke extreme */
+	short caps[2];
 
 	/** Vertex weight data. */
 	struct MDeformVert *dvert;
@@ -232,6 +233,15 @@ typedef enum eGPDstroke_Flag {
 	GP_STROKE_ERASER		= (1 << 15)
 } eGPDstroke_Flag;
 
+/* bGPDstroke->caps */
+typedef enum eGPDstroke_Caps {
+	/* type of extreme */
+	GP_STROKE_CAP_ROUND = 0,
+	GP_STROKE_CAP_FLAT  = 1,
+
+	GP_STROKE_CAP_MAX
+} GPDstroke_Caps;
+
 /* ***************************************** */
 /* GP Frame */
 
@@ -371,6 +381,8 @@ typedef enum eGPDlayer_Flag {
 	GP_LAYER_UNLOCK_COLOR 	= (1 << 12),
 	/* Mask Layer */
 	GP_LAYER_USE_MASK = (1 << 13),
+	/* Flag used to display in Paint mode only layers with keyframe */
+	GP_LAYER_SOLO_MODE = (1 << 4),
 } eGPDlayer_Flag;
 
 /* bGPDlayer->onion_flag */