Drivers - Rotational Difference

Restored the code to get this working. I haven't tested this to verify it, but it 'should' work...


Also, deleted old gpencil.c file in editors, since it was causing compiling errors. 

1 files changed, 0 insertions, 2161 deletions

diff --git a/source/blender/editors/gpencil/gpencil.c b/source/blender/editors/gpencil/gpencil.c
deleted file mode 100644
index f842cde72d9..00000000000
--- a/source/blender/editors/gpencil/gpencil.c
+++ /dev/null
@@ -1,2161 +0,0 @@
-/**
- * $Id$
- *
- * ***** BEGIN GPL LICENSE BLOCK *****
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
- *
- * The Original Code is Copyright (C) 2008, Blender Foundation
- * This is a new part of Blender
- *
- * Contributor(s): Joshua Leung
- *
- * ***** END GPL LICENSE BLOCK *****
- */
- 
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <math.h>
-
-#include "MEM_guardedalloc.h"
-
-#include "BMF_Api.h"
-
-#include "IMB_imbuf.h"
-#include "IMB_imbuf_types.h"
-
-#include "BLI_arithb.h"
-#include "BLI_blenlib.h"
-
-#include "DNA_listBase.h"
-#include "DNA_armature_types.h"
-#include "DNA_curve_types.h"
-#include "DNA_gpencil_types.h"
-#include "DNA_object_types.h"
-#include "DNA_scene_types.h"
-#include "DNA_screen_types.h"
-#include "DNA_space_types.h"
-#include "DNA_userdef_types.h"
-#include "DNA_vec_types.h"
-#include "DNA_view3d_types.h"
-
-#include "BKE_armature.h"
-#include "BKE_blender.h"
-#include "BKE_context.h"
-#include "BKE_curve.h"
-#include "BKE_global.h"
-#include "BKE_image.h"
-#include "BKE_library.h"
-#include "BKE_utildefines.h"
-
-#include "BIF_gl.h"
-#include "BIF_glutil.h"
-
-#include "WM_api.h"
-#include "WM_types.h"
-
-#include "UI_view2d.h"
-
-#include "ED_armature.h"
-#include "ED_gpencil.h"
-#include "ED_sequencer.h"
-#include "ED_view3d.h"
-
-#include "PIL_time.h"			/* sleep				*/
-
-#include "gpencil_intern.h"
-
-/* XXX */
-static void BIF_undo_push() {}
-static void error() {}
-static int pupmenu() {return 0;}
-static void add_object_draw() {}
-static int get_activedevice() {return 0;}
-#define L_MOUSE 0
-#define R_MOUSE 0
-
-/* XXX */
-
-/* ************************************************** */
-/* GENERAL STUFF */
-
-/* --------- Memory Management ------------ */
-
-/* Free strokes belonging to a gp-frame */
-void free_gpencil_strokes (bGPDframe *gpf)
-{
-	bGPDstroke *gps, *gpsn;
-	
-	/* error checking */
-	if (gpf == NULL) return;
-	
-	/* free strokes */
-	for (gps= gpf->strokes.first; gps; gps= gpsn) {
-		gpsn= gps->next;
-		
-		/* free stroke memory arrays, then stroke itself */
-		if (gps->points) MEM_freeN(gps->points);
-		BLI_freelinkN(&gpf->strokes, gps);
-	}
-}
-
-/* Free all of a gp-layer's frames */
-void free_gpencil_frames (bGPDlayer *gpl)
-{
-	bGPDframe *gpf, *gpfn;
-	
-	/* error checking */
-	if (gpl == NULL) return;
-	
-	/* free frames */
-	for (gpf= gpl->frames.first; gpf; gpf= gpfn) {
-		gpfn= gpf->next;
-		
-		/* free strokes and their associated memory */
-		free_gpencil_strokes(gpf);
-		BLI_freelinkN(&gpl->frames, gpf);
-	}
-}
-
-/* Free all of the gp-layers for a viewport (list should be &gpd->layers or so) */
-void free_gpencil_layers (ListBase *list) 
-{
-	bGPDlayer *gpl, *gpln;
-	
-	/* error checking */
-	if (list == NULL) return;
-	
-	/* delete layers*/
-	for (gpl= list->first; gpl; gpl= gpln) {
-		gpln= gpl->next;
-		
-		/* free layers and their data */
-		free_gpencil_frames(gpl);
-		BLI_freelinkN(list, gpl);
-	}
-}
-
-/* Free gp-data and all it's related data */
-void free_gpencil_data (bGPdata *gpd)
-{
-	/* free layers then data itself */
-	free_gpencil_layers(&gpd->layers);
-	MEM_freeN(gpd);
-}
-
-/* -------- Container Creation ---------- */
-
-/* add a new gp-frame to the given layer */
-bGPDframe *gpencil_frame_addnew (bGPDlayer *gpl, int cframe)
-{
-	bGPDframe *gpf, *gf;
-	short state=0;
-	
-	/* error checking */
-	if ((gpl == NULL) || (cframe <= 0))
-		return NULL;
-		
-	/* allocate memory for this frame */
-	gpf= MEM_callocN(sizeof(bGPDframe), "bGPDframe");
-	gpf->framenum= cframe;
-	
-	/* find appropriate place to add frame */
-	if (gpl->frames.first) {
-		for (gf= gpl->frames.first; gf; gf= gf->next) {
-			/* check if frame matches one that is supposed to be added */
-			if (gf->framenum == cframe) {
-				state= -1;
-				break;
-			}
-			
-			/* if current frame has already exceeded the frame to add, add before */
-			if (gf->framenum > cframe) {
-				BLI_insertlinkbefore(&gpl->frames, gf, gpf);
-				state= 1;
-				break;
-			}
-		}
-	}
-	
-	/* check whether frame was added successfully */
-	if (state == -1) {
-		MEM_freeN(gpf);
-		printf("Error: frame (%d) existed already for this layer \n", cframe);
-	}
-	else if (state == 0) {
-		/* add to end then! */
-		BLI_addtail(&gpl->frames, gpf);
-	}
-	
-	/* return frame */
-	return gpf;
-}
-
-/* add a new gp-layer and make it the active layer */
-bGPDlayer *gpencil_layer_addnew (bGPdata *gpd)
-{
-	bGPDlayer *gpl;
-	
-	/* check that list is ok */
-	if (gpd == NULL)
-		return NULL;
-		
-	/* allocate memory for frame and add to end of list */
-	gpl= MEM_callocN(sizeof(bGPDlayer), "bGPDlayer");
-	
-	/* add to datablock */
-	BLI_addtail(&gpd->layers, gpl);
-	
-	/* set basic settings */
-	gpl->color[3]= 0.9f;
-	gpl->thickness = 3;
-	
-	/* auto-name */
-	sprintf(gpl->info, "GP_Layer");
-	BLI_uniquename(&gpd->layers, gpl, "GP_Layer", '.', offsetof(bGPDlayer, info[0]), 128);
-	
-	/* make this one the active one */
-	gpencil_layer_setactive(gpd, gpl);
-	
-	/* return layer */
-	return gpl;
-}
-
-/* add a new gp-datablock */
-bGPdata *gpencil_data_addnew (void)
-{
-	bGPdata *gpd;
-	
-	/* allocate memory for a new block */
-	gpd= MEM_callocN(sizeof(bGPdata), "GreasePencilData");
-	
-	/* initial settings */
-	gpd->flag = (GP_DATA_DISPINFO|GP_DATA_EXPAND);
-	
-	return gpd;
-}
-
-/* -------- Data Duplication ---------- */
-
-/* make a copy of a given gpencil frame */
-bGPDframe *gpencil_frame_duplicate (bGPDframe *src)
-{
-	bGPDstroke *gps, *gpsd;
-	bGPDframe *dst;
-	
-	/* error checking */
-	if (src == NULL)
-		return NULL;
-		
-	/* make a copy of the source frame */
-	dst= MEM_dupallocN(src);
-	dst->prev= dst->next= NULL;
-	
-	/* copy strokes */
-	dst->strokes.first = dst->strokes.last= NULL;
-	for (gps= src->strokes.first; gps; gps= gps->next) {
-		/* make copy of source stroke, then adjust pointer to points too */
-		gpsd= MEM_dupallocN(gps);
-		gpsd->points= MEM_dupallocN(gps->points);
-		
-		BLI_addtail(&dst->strokes, gpsd);
-	}
-	
-	/* return new frame */
-	return dst;
-}
-
-/* make a copy of a given gpencil layer */
-bGPDlayer *gpencil_layer_duplicate (bGPDlayer *src)
-{
-	bGPDframe *gpf, *gpfd;
-	bGPDlayer *dst;
-	
-	/* error checking */
-	if (src == NULL)
-		return NULL;
-		
-	/* make a copy of source layer */
-	dst= MEM_dupallocN(src);
-	dst->prev= dst->next= NULL;
-	
-	/* copy frames */
-	dst->frames.first= dst->frames.last= NULL;
-	for (gpf= src->frames.first; gpf; gpf= gpf->next) {
-		/* make a copy of source frame */
-		gpfd= gpencil_frame_duplicate(gpf);
-		BLI_addtail(&dst->frames, gpfd);
-		
-		/* if source frame was the current layer's 'active' frame, reassign that too */
-		if (gpf == dst->actframe)
-			dst->actframe= gpfd;
-	}
-	
-	/* return new layer */
-	return dst;
-}
-
-/* make a copy of a given gpencil datablock */
-bGPdata *gpencil_data_duplicate (bGPdata *src)
-{
-	bGPDlayer *gpl, *gpld;
-	bGPdata *dst;
-	
-	/* error checking */
-	if (src == NULL)
-		return NULL;
-	
-	/* make a copy of the base-data */
-	dst= MEM_dupallocN(src);
-	
-	/* copy layers */
-	dst->layers.first= dst->layers.last= NULL;
-	for (gpl= src->layers.first; gpl; gpl= gpl->next) {
-		/* make a copy of source layer and its data */
-		gpld= gpencil_layer_duplicate(gpl);
-		BLI_addtail(&dst->layers, gpld);
-	}
-	
-	/* return new */
-	return dst;
-}
-
-/* ----------- GP-Datablock API ------------- */
-
-/* get the appropriate bGPdata from the active/given context */
-// XXX region or region data?
-bGPdata *gpencil_data_getactive (ScrArea *sa)
-{
-	ScrArea *curarea= NULL; // XXX
-	
-	/* error checking */
-	if ((sa == NULL) && (curarea == NULL))
-		return NULL;
-	if (sa == NULL)
-		sa= curarea;
-		
-	/* handle depending on spacetype */
-	switch (sa->spacetype) {
-		case SPACE_VIEW3D:
-		{
-			View3D *v3d= sa->spacedata.first;
-			return v3d->gpd;
-		}
-			break;
-		case SPACE_NODE:
-		{
-			SpaceNode *snode= sa->spacedata.first;
-			return snode->gpd;
-		}
-			break;
-		case SPACE_SEQ:
-		{
-			SpaceSeq *sseq= sa->spacedata.first;
-			
-			/* only applicable for image modes */
-			if (sseq->mainb != SEQ_DRAW_SEQUENCE)
-				return sseq->gpd;
-		}
-			break;
-		case SPACE_IMAGE:
-		{
-			SpaceImage *sima= sa->spacedata.first;
-			return sima->gpd;
-		}
-			break;
-	}
-	
-	/* nothing found */
-	return NULL;
-}
-
-/* set bGPdata for the active/given context, and return success/fail */
-short gpencil_data_setactive (ScrArea *sa, bGPdata *gpd)
-{
-	ScrArea *curarea= NULL; // XXX
-	
-	/* error checking */
-	if ((sa == NULL) && (curarea == NULL))
-		return 0;
-	if (gpd == NULL)
-		return 0;
-	if (sa == NULL)
-		sa= curarea;
-	
-	/* handle depending on spacetype */
-	// TODO: someday we should have multi-user data, so no need to loose old data
-	switch (sa->spacetype) {
-		case SPACE_VIEW3D:
-		{
-			View3D *v3d= sa->spacedata.first;
-			
-			/* free the existing block */
-			if (v3d->gpd)
-				free_gpencil_data(v3d->gpd);
-			v3d->gpd= gpd;
-			
-			return 1;
-		}
-			break;
-		case SPACE_NODE:
-		{
-			SpaceNode *snode= sa->spacedata.first;
-			
-			/* free the existing block */
-			if (snode->gpd)
-				free_gpencil_data(snode->gpd);
-			snode->gpd= gpd;
-			
-			/* set special settings */
-			gpd->flag |= GP_DATA_VIEWALIGN;
-			
-			return 1;
-		}
-			break;
-		case SPACE_SEQ:
-		{
-			SpaceSeq *sseq= sa->spacedata.first;
-			
-			/* only applicable if right mode */
-			if (sseq->mainb != SEQ_DRAW_SEQUENCE) {
-				/* free the existing block */
-				if (sseq->gpd)
-					free_gpencil_data(sseq->gpd);
-				sseq->gpd= gpd;
-				
-				return 1;
-			}
-		}
-			break;
-		case SPACE_IMAGE:
-		{
-			SpaceImage *sima= sa->spacedata.first;
-			
-			if (sima->gpd)
-				free_gpencil_data(sima->gpd);
-			sima->gpd= gpd;
-			
-			return 1;
-		}
-			break;
-	}
-	
-	/* failed to add */
-	return 0;
-}
-
-/* return the ScrArea that has the given GP-datablock
- *	- assumes that only searching in current screen
- *	- is based on GP-datablocks only being able to 
- * 	  exist for one area at a time (i.e. not multiuser)
- */
-ScrArea *gpencil_data_findowner (bGPdata *gpd)
-{
-	bScreen *curscreen= NULL; // XXX
-	ScrArea *sa;
-	
-	/* error checking */
-	if (gpd == NULL)
-		return NULL;
-		
-	/* loop over all scrareas for current screen, and check if that area has this gpd */
-	for (sa= curscreen->areabase.first; sa; sa= sa->next) {
-		/* use get-active func to see if match */
-		if (gpencil_data_getactive(sa) == gpd)
-			return sa;
-	}
-	
-	/* not found */
-	return NULL;
-}
-
-/* -------- GP-Frame API ---------- */
-
-/* delete the last stroke of the given frame */
-void gpencil_frame_delete_laststroke (bGPDframe *gpf)
-{
-	bGPDstroke *gps= (gpf) ? gpf->strokes.last : NULL;
-	
-	/* error checking */
-	if (ELEM(NULL, gpf, gps))
-		return;
-	
-	/* free the stroke and its data */
-	MEM_freeN(gps->points);
-	BLI_freelinkN(&gpf->strokes, gps);
-}
-
-/* -------- GP-Layer API ---------- */
-
-/* get the appropriate gp-frame from a given layer
- *	- this sets the layer's actframe var (if allowed to)
- *	- extension beyond range (if first gp-frame is after all frame in interest and cannot add)
- */
-bGPDframe *gpencil_layer_getframe (bGPDlayer *gpl, int cframe, short addnew)
-{
-	bGPDframe *gpf = NULL;
-	short found = 0;
-	
-	/* error checking */
-	if (gpl == NULL) return NULL;
-	if (cframe <= 0) cframe = 1;
-	
-	/* check if there is already an active frame */
-	if (gpl->actframe) {
-		gpf= gpl->actframe;
-		
-		/* do not allow any changes to layer's active frame if layer is locked */
-		if (gpl->flag & GP_LAYER_LOCKED)
-			return gpf;
-		/* do not allow any changes to actframe if frame has painting tag attached to it */
-		if (gpf->flag & GP_FRAME_PAINT) 
-			return gpf;
-		
-		/* try to find matching frame */
-		if (gpf->framenum < cframe) {
-			for (; gpf; gpf= gpf->next) {
-				if (gpf->framenum == cframe) {
-					found= 1;
-					break;
-				}
-				else if ((gpf->next) && (gpf->next->framenum > cframe)) {
-					found= 1;
-					break;
-				}
-			}
-			
-			/* set the appropriate frame */
-			if (addnew) {
-				if ((found) && (gpf->framenum == cframe))
-					gpl->actframe= gpf;
-				else
-					gpl->actframe= gpencil_frame_addnew(gpl, cframe);
-			}
-			else if (found)
-				gpl->actframe= gpf;
-			else
-				gpl->actframe= gpl->frames.last;
-		}
-		else {
-			for (; gpf; gpf= gpf->prev) {
-				if (gpf->framenum <= cframe) {
-					found= 1;
-					break;
-				}
-			}
-			
-			/* set the appropriate frame */
-			if (addnew) {
-				if ((found) && (gpf->framenum == cframe))
-					gpl->actframe= gpf;
-				else
-					gpl->actframe= gpencil_frame_addnew(gpl, cframe);
-			}
-			else if (found)
-				gpl->actframe= gpf;
-			else
-				gpl->actframe= gpl->frames.first;
-		}
-	}
-	else if (gpl->frames.first) {
-		/* check which of the ends to start checking from */
-		const int first= ((bGPDframe *)(gpl->frames.first))->framenum;
-		const int last= ((bGPDframe *)(gpl->frames.last))->framenum;
-		
-		if (abs(cframe-first) > abs(cframe-last)) {
-			/* find gp-frame which is less than or equal to cframe */
-			for (gpf= gpl->frames.last; gpf; gpf= gpf->prev) {
-				if (gpf->framenum <= cframe) {
-					found= 1;
-					break;
-				}
-			}
-		}
-		else {
-			/* find gp-frame which is less than or equal to cframe */
-			for (gpf= gpl->frames.first; gpf; gpf= gpf->next) {
-				if (gpf->framenum <= cframe) {
-					found= 1;
-					break;
-				}
-			}
-		}
-		
-		/* set the appropriate frame */
-		if (addnew) {
-			if ((found) && (gpf->framenum == cframe))
-				gpl->actframe= gpf;
-			else
-				gpl->actframe= gpencil_frame_addnew(gpl, cframe);
-		}
-		else if (found)
-			gpl->actframe= gpf;
-		else {
-			/* unresolved errogenous situation! */
-			printf("Error: cannot find appropriate gp-frame \n");
-			/* gpl->actframe should still be NULL */
-		}
-	}
-	else {
-		/* currently no frames (add if allowed to) */
-		if (addnew)
-			gpl->actframe= gpencil_frame_addnew(gpl, cframe);
-		else {
-			/* don't do anything... this may be when no frames yet! */
-			/* gpl->actframe should still be NULL */
-		}
-	}
-	
-	/* return */
-	return gpl->actframe;
-}
-
-/* delete the given frame from a layer */
-void gpencil_layer_delframe (bGPDlayer *gpl, bGPDframe *gpf)
-{
-	/* error checking */
-	if (ELEM(NULL, gpl, gpf))
-		return;
-		
-	/* free the frame and its data */
-	free_gpencil_strokes(gpf);
-	BLI_freelinkN(&gpl->frames, gpf);
-	gpl->actframe = NULL;
-}
-
-/* get the active gp-layer for editing */
-bGPDlayer *gpencil_layer_getactive (bGPdata *gpd)
-{
-	bGPDlayer *gpl;
-	
-	/* error checking */
-	if (ELEM(NULL, gpd, gpd->layers.first))
-		return NULL;
-		
-	/* loop over layers until found (assume only one active) */
-	for (gpl=gpd->layers.first; gpl; gpl=gpl->next) {
-		if (gpl->flag & GP_LAYER_ACTIVE)
-			return gpl;
-	}
-	
-	/* no active layer found */
-	return NULL;
-}
-
-/* set the active gp-layer */
-void gpencil_layer_setactive (bGPdata *gpd, bGPDlayer *active)
-{
-	bGPDlayer *gpl;
-	
-	/* error checking */
-	if (ELEM3(NULL, gpd, gpd->layers.first, active))
-		return;
-		
-	/* loop over layers deactivating all */
-	for (gpl=gpd->layers.first; gpl; gpl=gpl->next)
-		gpl->flag &= ~GP_LAYER_ACTIVE;
-	
-	/* set as active one */
-	active->flag |= GP_LAYER_ACTIVE;
-}
-
-/* delete the active gp-layer */
-void gpencil_layer_delactive (bGPdata *gpd)
-{
-	bGPDlayer *gpl= gpencil_layer_getactive(gpd);
-	
-	/* error checking */
-	if (ELEM(NULL, gpd, gpl)) 
-		return;
-	
-	/* free layer */	
-	free_gpencil_frames(gpl);
-	BLI_freelinkN(&gpd->layers, gpl);
-}
-
-/* ************************************************** */
-/* GREASE-PENCIL EDITING - Tools */
-
-/* --------- Data Deletion ---------- */
-
-/* delete the last stroke on the active layer */
-void gpencil_delete_laststroke (bGPdata *gpd, int cfra)
-{
-	bGPDlayer *gpl= gpencil_layer_getactive(gpd);
-	bGPDframe *gpf= gpencil_layer_getframe(gpl, cfra, 0);
-	
-	gpencil_frame_delete_laststroke(gpf);
-}
-
-/* delete the active frame */
-void gpencil_delete_actframe (bGPdata *gpd, int cfra)
-{
-	bGPDlayer *gpl= gpencil_layer_getactive(gpd);
-	bGPDframe *gpf= gpencil_layer_getframe(gpl, cfra, 0);
-	
-	gpencil_layer_delframe(gpl, gpf);
-}
-
-
-
-/* delete various grase-pencil elements 
- *	mode: 	1 - last stroke
- *		 	2 - active frame
- *			3 - active layer
- */
-void gpencil_delete_operation (int cfra, short mode)
-{
-	bGPdata *gpd;
-	
-	/* get datablock to work on */
-	gpd= gpencil_data_getactive(NULL);
-	if (gpd == NULL) return;
-	
-	switch (mode) {
-		case 1: /* last stroke */
-			gpencil_delete_laststroke(gpd, cfra);
-			break;
-		case 2: /* active frame */
-			gpencil_delete_actframe(gpd, cfra);
-			break;
-		case 3: /* active layer */
-			gpencil_layer_delactive(gpd);
-			break;
-	}
-	
-	/* redraw and undo-push */
-	BIF_undo_push("GPencil Delete");
-}
-
-/* display a menu for deleting different grease-pencil elements */
-void gpencil_delete_menu (void)
-{
-	bGPdata *gpd= gpencil_data_getactive(NULL);
-	int cfra= 0; // XXX
-	short mode;
-	
-	/* only show menu if it will be relevant */
-	if (gpd == NULL) return;
-	
-	mode= pupmenu("Grease Pencil Erase...%t|Last Stroke%x1|Active Frame%x2|Active Layer%x3");
-	if (mode <= 0) return;
-	
-	gpencil_delete_operation(cfra, mode);
-}
-
-/* --------- Data Conversion ---------- */
-
-/* convert the coordinates from the given stroke point into 3d-coordinates */
-static void gp_strokepoint_convertcoords (bGPDstroke *gps, bGPDspoint *pt, float p3d[3])
-{
-	ARegion *ar= NULL; // XXX
-	
-	if (gps->flag & GP_STROKE_3DSPACE) {
-		/* directly use 3d-coordinates */
-		VecCopyf(p3d, &pt->x);
-	}
-	else {
-		short mval[2];
-		int mx, my;
-		float *fp= give_cursor(NULL, NULL); // XXX should be scene, v3d
-		float dvec[3];
-		
-		/* get screen coordinate */
-		if (gps->flag & GP_STROKE_2DSPACE) {
-			// XXX
-			// View2D *v2d= spacelink_get_view2d(curarea->spacedata.first);
-			// UI_view2d_view_to_region(v2d, pt->x, pt->y, &mx, &my);
-		}
-		else {
-			// XXX
-			// mx= (short)(pt->x / 1000 * curarea->winx);
-			// my= (short)(pt->y / 1000 * curarea->winy);
-		}
-		
-		/* convert screen coordinate to 3d coordinates 
-		 *	- method taken from editview.c - mouse_cursor() 
-		 */
-		project_short_noclip(ar, fp, mval);
-		window_to_3d_delta(ar, dvec, mval[0]-mx, mval[1]-my);
-		VecSubf(p3d, fp, dvec);
-	}
-}
-
-/* --- */
-
-/* convert stroke to 3d path */
-static void gp_stroke_to_path (bGPDlayer *gpl, bGPDstroke *gps, Curve *cu)
-{
-	bGPDspoint *pt;
-	Nurb *nu;
-	BPoint *bp;
-	int i;
-	
-	/* create new 'nurb' within the curve */
-	nu = (Nurb *)MEM_callocN(sizeof(Nurb), "gpstroke_to_path(nurb)");
-	
-	nu->pntsu= gps->totpoints;
-	nu->pntsv= 1;
-	nu->orderu= gps->totpoints;
-	nu->flagu= 2;	/* endpoint */
-	nu->resolu= 32;
-	
-	nu->bp= (BPoint *)MEM_callocN(sizeof(BPoint)*gps->totpoints, "bpoints");
-	
-	/* add points */
-	for (i=0, pt=gps->points, bp=nu->bp; i < gps->totpoints; i++, pt++, bp++) {
-		float p3d[3];
-		
-		/* get coordinates to add at */
-		gp_strokepoint_convertcoords(gps, pt, p3d);
-		VecCopyf(bp->vec, p3d);
-		
-		/* set settings */
-		bp->f1= SELECT;
-		bp->radius = bp->weight = pt->pressure * gpl->thickness;
-	}
-	
-	/* add nurb to curve */
-	BLI_addtail(&cu->nurb, nu);
-}
-
-/* convert stroke to 3d bezier */
-static void gp_stroke_to_bezier (bGPDlayer *gpl, bGPDstroke *gps, Curve *cu)
-{
-	bGPDspoint *pt;
-	Nurb *nu;
-	BezTriple *bezt;
-	int i;
-	
-	/* create new 'nurb' within the curve */
-	nu = (Nurb *)MEM_callocN(sizeof(Nurb), "gpstroke_to_bezier(nurb)");
-	
-	nu->pntsu= gps->totpoints;
-	nu->resolu= 12;
-	nu->resolv= 12;
-	nu->type= CU_BEZIER;
-	nu->bezt = (BezTriple *)MEM_callocN(gps->totpoints*sizeof(BezTriple), "bezts");
-	
-	/* add points */
-	for (i=0, pt=gps->points, bezt=nu->bezt; i < gps->totpoints; i++, pt++, bezt++) {
-		float p3d[3];
-		
-		/* get coordinates to add at */
-		gp_strokepoint_convertcoords(gps, pt, p3d);
-		
-		/* TODO: maybe in future the handles shouldn't be in same place */
-		VecCopyf(bezt->vec[0], p3d);
-		VecCopyf(bezt->vec[1], p3d);
-		VecCopyf(bezt->vec[2], p3d);
-		
-		/* set settings */
-		bezt->h1= bezt->h2= HD_FREE;
-		bezt->f1= bezt->f2= bezt->f3= SELECT;
-		bezt->radius = bezt->weight = pt->pressure * gpl->thickness * 0.1f;
-	}
-	
-	/* must calculate handles or else we crash */
-	calchandlesNurb(nu);
-	
-	/* add nurb to curve */
-	BLI_addtail(&cu->nurb, nu);
-}
-
-/* convert a given grease-pencil layer to a 3d-curve representation (using current view if appropriate) */
-static void gp_layer_to_curve (bGPdata *gpd, bGPDlayer *gpl, Scene *scene, short mode)
-{
-	bGPDframe *gpf= gpencil_layer_getframe(gpl, scene->r.cfra, 0);
-	bGPDstroke *gps;
-	Object *ob;
-	Curve *cu;
-	
-	/* error checking */
-	if (ELEM3(NULL, gpd, gpl, gpf))
-		return;
-		
-	/* only convert if there are any strokes on this layer's frame to convert */
-	if (gpf->strokes.first == NULL)
-		return;
-	
-	/* init the curve object (remove rotation and get curve data from it)
-	 *	- must clear transforms set on object, as those skew our results
-	 */
-	add_object_draw(OB_CURVE);
-	ob= OBACT;
-	ob->loc[0]= ob->loc[1]= ob->loc[2]= 0;
-	ob->rot[0]= ob->rot[1]= ob->rot[2]= 0;
-	cu= ob->data;
-	cu->flag |= CU_3D;
-	
-	/* rename object and curve to layer name */
-	rename_id((ID *)ob, gpl->info);
-	rename_id((ID *)cu, gpl->info);
-	
-	/* add points to curve */
-	for (gps= gpf->strokes.first; gps; gps= gps->next) {
-		switch (mode) {
-			case 1: 
-				gp_stroke_to_path(gpl, gps, cu);
-				break;
-			case 2:
-				gp_stroke_to_bezier(gpl, gps, cu);
-				break;
-		}
-	}
-}
-
-/* --- */
-
-/* convert a stroke to a bone chain */
-static void gp_stroke_to_bonechain (bGPDlayer *gpl, bGPDstroke *gps, bArmature *arm, ListBase *bones)
-{
-	EditBone *ebo, *prev=NULL;
-	bGPDspoint *pt, *ptn;
-	int i;
-	
-	/* add each segment separately */
-	for (i=0, pt=gps->points, ptn=gps->points+1; i < (gps->totpoints-1); prev=ebo, i++, pt++, ptn++) {
-		float p3da[3], p3db[3];
-		
-		/* get coordinates to add at */
-		gp_strokepoint_convertcoords(gps, pt, p3da);
-		gp_strokepoint_convertcoords(gps, ptn, p3db);
-		
-		/* allocate new bone */
-		ebo= MEM_callocN(sizeof(EditBone), "eBone");
-		
-		VecCopyf(ebo->head, p3da);
-		VecCopyf(ebo->tail, p3db);
-		
-		/* add new bone - note: sync with editarmature.c::add_editbone() */
-		{
-			BLI_strncpy(ebo->name, "Stroke", 32);
-			unique_editbone_name(bones, ebo->name, NULL);
-			
-			BLI_addtail(bones, ebo);
-			
-			if (i > 0)
-			{
-				ebo->flag |= BONE_CONNECTED;
-			}
-			ebo->weight= 1.0f;
-			ebo->dist= 0.25f;
-			ebo->xwidth= 0.1f;
-			ebo->zwidth= 0.1f;
-			ebo->ease1= 1.0f;
-			ebo->ease2= 1.0f;
-			ebo->rad_head= pt->pressure * gpl->thickness * 0.1f;
-			ebo->rad_tail= ptn->pressure * gpl->thickness * 0.1f;
-			ebo->segments= 1;
-			ebo->layer= arm->layer;
-		}
-		
-		/* set parenting */
-		ebo->parent= prev;
-	}
-}
-
-/* convert a given grease-pencil layer to a 3d-curve representation (using current view if appropriate) */
-static void gp_layer_to_armature (bGPdata *gpd, bGPDlayer *gpl, Scene *scene, View3D *v3d, short mode)
-{
-	bGPDframe *gpf= gpencil_layer_getframe(gpl, scene->r.cfra, 0);
-	bGPDstroke *gps;
-	Object *ob;
-	bArmature *arm;
-	
-	/* error checking */
-	if (ELEM3(NULL, gpd, gpl, gpf))
-		return;
-		
-	/* only convert if there are any strokes on this layer's frame to convert */
-	if (gpf->strokes.first == NULL)
-		return;
-	
-	/* init the armature object (remove rotation and assign armature data to it) 
-	 *	- must clear transforms set on object, as those skew our results
-	 */
-	add_object_draw(OB_ARMATURE);
-	ob= OBACT;
-	ob->loc[0]= ob->loc[1]= ob->loc[2]= 0;
-	ob->rot[0]= ob->rot[1]= ob->rot[2]= 0;
-	arm= ob->data;
-	
-	/* rename object and armature to layer name */
-	rename_id((ID *)ob, gpl->info);
-	rename_id((ID *)arm, gpl->info);
-	
-	/* this is editmode armature */
-	arm->edbo= MEM_callocN(sizeof(ListBase), "arm edbo");
-	
-	/* convert segments to bones, strokes to bone chains */
-	for (gps= gpf->strokes.first; gps; gps= gps->next) {
-		gp_stroke_to_bonechain(gpl, gps, arm, arm->edbo);
-	}
-	
-	/* adjust roll of bones
-	 * 	- set object as EditMode object, but need to clear afterwards!
-	 *	- use 'align to world z-up' option
-	 */
-	{
-		/* set our data as if we're in editmode to fool auto_align_armature() */
-		scene->obedit= ob;
-		
-		/* WARNING: need to make sure this magic number doesn't change */
-		auto_align_armature(scene, v3d, 2);	
-		
-		scene->obedit= NULL;
-	}
-	
-	/* flush editbones to armature */
-	ED_armature_from_edit(scene, ob);
-	ED_armature_edit_free(ob);
-}
-
-/* --- */
-
-/* convert grease-pencil strokes to another representation 
- *	mode: 	1 - Active layer to path
- *			2 - Active layer to bezier
- *			3 - Active layer to armature
- */
-void gpencil_convert_operation (short mode)
-{
-	Scene *scene= NULL; // XXX
-	View3D *v3d= NULL; // XXX
-	RegionView3D *rv3d= NULL; // XXX
-	bGPdata *gpd;	
-	float *fp= give_cursor(scene, v3d);
-	
-	/* get datablock to work on */
-	gpd= gpencil_data_getactive(NULL);
-	if (gpd == NULL) return;
-	
-	/* initialise 3d-cursor correction globals */
-	initgrabz(rv3d, fp[0], fp[1], fp[2]);
-	
-	/* handle selection modes */
-	switch (mode) {
-		case 1: /* active layer only (to path) */
-		case 2: /* active layer only (to bezier) */
-		{
-			bGPDlayer *gpl= gpencil_layer_getactive(gpd);
-			gp_layer_to_curve(gpd, gpl, scene, mode);
-		}
-			break;
-		case 3: /* active layer only (to armature) */
-		{
-			bGPDlayer *gpl= gpencil_layer_getactive(gpd);
-			gp_layer_to_armature(gpd, gpl, scene, v3d, mode);
-		}
-			break;
-	}
-	
-	/* redraw and undo-push */
-	BIF_undo_push("GPencil Convert");
-}
-
-/* display a menu for converting grease-pencil strokes */
-void gpencil_convert_menu (void)
-{
-	bGPdata *gpd= gpencil_data_getactive(NULL);
-	short mode;
-	
-	/* only show menu if it will be relevant */
-	if (gpd == NULL) return;
-	
-	mode= pupmenu("Grease Pencil Convert %t|Active Layer To Path%x1|Active Layer to Bezier%x2|Active Layer to Armature%x3");
-	if (mode <= 0) return;
-	
-	gpencil_convert_operation(mode);
-}
-
-/* ************************************************** */
-/* GREASE-PENCIL EDITING MODE - Painting */
-
-/* ---------- 'Globals' and Defines ----------------- */
-
-/* maximum sizes of gp-session buffer */
-#define GP_STROKE_BUFFER_MAX	5000
-
-/* Macros for accessing sensitivity thresholds... */
-	/* minimum number of pixels mouse should move before new point created */
-#define MIN_MANHATTEN_PX	(U.gp_manhattendist)
-	/* minimum length of new segment before new point can be added */
-#define MIN_EUCLIDEAN_PX	(U.gp_euclideandist)
-
-/* macro to test if only converting endpoints - only for use when converting!  */	
-#define GP_BUFFER2STROKE_ENDPOINTS ((gpd->flag & GP_DATA_EDITPAINT) && (ctrl))
-	
-/* ------ */
-
-/* Temporary 'Stroke' Operation data */
-typedef struct tGPsdata {
-	Scene *scene;       /* current scene from context */
-	ScrArea *sa;		/* area where painting originated */
-	ARegion *ar;        /* region where painting originated */
-	View2D *v2d;		/* needed for GP_STROKE_2DSPACE */
-	
-	ImBuf *ibuf;		/* needed for GP_STROKE_2DIMAGE */
-	struct IBufViewSettings {
-		int offsx, offsy;			/* offsets */
-		int sizex, sizey;			/* dimensions to use as scale-factor */
-	} im2d_settings;	/* needed for GP_STROKE_2DIMAGE */
-	
-	bGPdata *gpd;		/* gp-datablock layer comes from */
-	bGPDlayer *gpl;		/* layer we're working on */
-	bGPDframe *gpf;		/* frame we're working on */
-	
-	short status;		/* current status of painting */
-	short paintmode;	/* mode for painting */
-	
-	short mval[2];		/* current mouse-position */
-	short mvalo[2];		/* previous recorded mouse-position */
-	
-	float pressure;		/* current stylus pressure */
-	float opressure;	/* previous stylus pressure */
-	
-	short radius;		/* radius of influence for eraser */
-} tGPsdata;
-
-/* values for tGPsdata->status */
-enum {
-	GP_STATUS_NORMAL = 0,	/* running normally */
-	GP_STATUS_ERROR,		/* something wasn't correctly set up */
-	GP_STATUS_DONE			/* painting done */
-};
-
-/* values for tGPsdata->paintmode */
-enum {
-	GP_PAINTMODE_DRAW = 0,
-	GP_PAINTMODE_ERASER
-};
-
-/* Return flags for adding points to stroke buffer */
-enum {
-	GP_STROKEADD_INVALID	= -2,		/* error occurred - insufficient info to do so */
-	GP_STROKEADD_OVERFLOW	= -1,		/* error occurred - cannot fit any more points */
-	GP_STROKEADD_NORMAL,				/* point was successfully added */
-	GP_STROKEADD_FULL					/* cannot add any more points to buffer */
-};
-
-/* ---------- Stroke Editing ------------ */
-
-/* clear the session buffers (call this before AND after a paint operation) */
-static void gp_session_validatebuffer (tGPsdata *p)
-{
-	bGPdata *gpd= p->gpd;
-	
-	/* clear memory of buffer (or allocate it if starting a new session) */
-	if (gpd->sbuffer)
-		memset(gpd->sbuffer, 0, sizeof(tGPspoint)*GP_STROKE_BUFFER_MAX);
-	else
-		gpd->sbuffer= MEM_callocN(sizeof(tGPspoint)*GP_STROKE_BUFFER_MAX, "gp_session_strokebuffer");
-	
-	/* reset indices */
-	gpd->sbuffer_size = 0;
-	
-	/* reset flags */
-	gpd->sbuffer_sflag= 0;
-}
-
-/* check if the current mouse position is suitable for adding a new point */
-static short gp_stroke_filtermval (tGPsdata *p, short mval[2], short pmval[2])
-{
-	short dx= abs(mval[0] - pmval[0]);
-	short dy= abs(mval[1] - pmval[1]);
-	
-	/* check if mouse moved at least certain distance on both axes (best case) */
-	if ((dx > MIN_MANHATTEN_PX) && (dy > MIN_MANHATTEN_PX))
-		return 1;
-	
-	/* check if the distance since the last point is significant enough */
-	// future optimisation: sqrt here may be too slow?
-	else if (sqrt(dx*dx + dy*dy) > MIN_EUCLIDEAN_PX)
-		return 1;
-	
-	/* mouse 'didn't move' */
-	else
-		return 0;
-}
-
-/* convert screen-coordinates to buffer-coordinates */
-static void gp_stroke_convertcoords (tGPsdata *p, short mval[], float out[])
-{
-	bGPdata *gpd= p->gpd;
-	
-	/* in 3d-space - pt->x/y/z are 3 side-by-side floats */
-	if (gpd->sbuffer_sflag & GP_STROKE_3DSPACE) {
-		const short mx=mval[0], my=mval[1];
-		float *fp= give_cursor(p->scene, NULL); // XXX NULL could be v3d
-		float dvec[3];
-		
-		/* Current method just converts each point in screen-coordinates to 
-		 * 3D-coordinates using the 3D-cursor as reference. In general, this 
-		 * works OK, but it could of course be improved.
-		 *
-		 * TODO:
-		 *	- investigate using nearest point(s) on a previous stroke as
-		 *	  reference point instead or as offset, for easier stroke matching
-		 *	- investigate projection onto geometry (ala retopo)
-		 */
-		
-		/* method taken from editview.c - mouse_cursor() */
-		project_short_noclip(p->ar, fp, mval);
-		window_to_3d_delta(p->ar, dvec, mval[0]-mx, mval[1]-my);
-		VecSubf(out, fp, dvec);
-	}
-	
-	/* 2d - on 'canvas' (assume that p->v2d is set) */
-	else if ((gpd->sbuffer_sflag & GP_STROKE_2DSPACE) && (p->v2d)) {
-		float x, y;
-		
-		UI_view2d_region_to_view(p->v2d, mval[0], mval[1], &x, &y);
-		
-		out[0]= x;
-		out[1]= y;
-	}
-	
-	/* 2d - on image 'canvas' (assume that p->v2d is set) */
-	else if (gpd->sbuffer_sflag & GP_STROKE_2DIMAGE) {
-		int sizex, sizey, offsx, offsy;
-		
-		/* get stored settings 
-		 *	- assume that these have been set already (there are checks that set sane 'defaults' just in case)
-		 */
-		sizex= p->im2d_settings.sizex;
-		sizey= p->im2d_settings.sizey;
-		offsx= p->im2d_settings.offsx;
-		offsy= p->im2d_settings.offsy;
-		
-		/* calculate new points */
-		out[0]= (float)(mval[0] - offsx) / (float)sizex;
-		out[1]= (float)(mval[1] - offsy) / (float)sizey;
-	}
-	
-	/* 2d - relative to screen (viewport area) */
-	else {
-		out[0] = (float)(mval[0]) / (float)(p->sa->winx) * 1000;
-		out[1] = (float)(mval[1]) / (float)(p->sa->winy) * 1000;
-	}
-}
-
-/* add current stroke-point to buffer (returns whether point was successfully added) */
-static short gp_stroke_addpoint (tGPsdata *p, short mval[2], float pressure)
-{
-	bGPdata *gpd= p->gpd;
-	tGPspoint *pt;
-	
-	/* check if still room in buffer */
-	if (gpd->sbuffer_size >= GP_STROKE_BUFFER_MAX)
-		return GP_STROKEADD_OVERFLOW;
-	
-	/* get pointer to destination point */
-	pt= ((tGPspoint *)(gpd->sbuffer) + gpd->sbuffer_size);
-	
-	/* store settings */
-	pt->x= mval[0];
-	pt->y= mval[1];
-	pt->pressure= pressure;
-	
-	/* increment counters */
-	gpd->sbuffer_size++;
-	
-	/* check if another operation can still occur */
-	if (gpd->sbuffer_size == GP_STROKE_BUFFER_MAX)
-		return GP_STROKEADD_FULL;
-	else
-		return GP_STROKEADD_NORMAL;
-}
-
-/* smooth a stroke (in buffer) before storing it */
-static void gp_stroke_smooth (tGPsdata *p)
-{
-	bGPdata *gpd= p->gpd;
-	int i=0, cmx=gpd->sbuffer_size;
-	int ctrl= 0; // XXX
-	
-	/* only smooth if smoothing is enabled, and we're not doing a straight line */
-	if (!(U.gp_settings & GP_PAINT_DOSMOOTH) || GP_BUFFER2STROKE_ENDPOINTS)
-		return;
-	
-	/* don't try if less than 2 points in buffer */
-	if ((cmx <= 2) || (gpd->sbuffer == NULL))
-		return;
-	
-	/* apply weighting-average (note doing this along path sequentially does introduce slight error) */
-	for (i=0; i < gpd->sbuffer_size; i++) {
-		tGPspoint *pc= (((tGPspoint *)gpd->sbuffer) + i);
-		tGPspoint *pb= (i-1 > 0)?(pc-1):(pc);
-		tGPspoint *pa= (i-2 > 0)?(pc-2):(pb);
-		tGPspoint *pd= (i+1 < cmx)?(pc+1):(pc);
-		tGPspoint *pe= (i+2 < cmx)?(pc+2):(pd);
-		
-		pc->x= (short)(0.1*pa->x + 0.2*pb->x + 0.4*pc->x + 0.2*pd->x + 0.1*pe->x);
-		pc->y= (short)(0.1*pa->y + 0.2*pb->y + 0.4*pc->y + 0.2*pd->y + 0.1*pe->y);
-	}
-}
-
-/* simplify a stroke (in buffer) before storing it 
- *	- applies a reverse Chaikin filter
- *	- code adapted from etch-a-ton branch (editarmature_sketch.c)
- */
-static void gp_stroke_simplify (tGPsdata *p)
-{
-	bGPdata *gpd= p->gpd;
-	tGPspoint *old_points= (tGPspoint *)gpd->sbuffer;
-	short num_points= gpd->sbuffer_size;
-	short flag= gpd->sbuffer_sflag;
-	short i, j;
-	int ctrl= 0; // XXX
-	
-	/* only simplify if simlification is enabled, and we're not doing a straight line */
-	if (!(U.gp_settings & GP_PAINT_DOSIMPLIFY) || GP_BUFFER2STROKE_ENDPOINTS)
-		return;
-	
-	/* don't simplify if less than 4 points in buffer */
-	if ((num_points <= 2) || (old_points == NULL))
-		return;
-		
-	/* clear buffer (but don't free mem yet) so that we can write to it 
-	 *	- firstly set sbuffer to NULL, so a new one is allocated
-	 *	- secondly, reset flag after, as it gets cleared auto
-	 */
-	gpd->sbuffer= NULL;
-	gp_session_validatebuffer(p);
-	gpd->sbuffer_sflag = flag;
-	
-/* macro used in loop to get position of new point
- *	- used due to the mixture of datatypes in use here
- */
-#define GP_SIMPLIFY_AVPOINT(offs, sfac) \
-	{ \
-		co[0] += (float)(old_points[offs].x * sfac); \
-		co[1] += (float)(old_points[offs].y * sfac); \
-		pressure += old_points[offs].pressure * sfac; \
-	}
-	
-	for (i = 0, j = 0; i < num_points; i++)
-	{
-		if (i - j == 3)
-		{
-			float co[2], pressure;
-			short mco[2];
-			
-			/* initialise values */
-			co[0]= 0;
-			co[1]= 0;
-			pressure = 0;
-			
-			/* using macro, calculate new point */
-			GP_SIMPLIFY_AVPOINT(j, -0.25f);
-			GP_SIMPLIFY_AVPOINT(j+1, 0.75f);
-			GP_SIMPLIFY_AVPOINT(j+2, 0.75f);
-			GP_SIMPLIFY_AVPOINT(j+3, -0.25f);
-			
-			/* set values for adding */
-			mco[0]= (short)co[0];
-			mco[1]= (short)co[1];
-			
-			/* ignore return values on this... assume to be ok for now */
-			gp_stroke_addpoint(p, mco, pressure);
-			
-			j += 2;
-		}
-	} 
-	
-	/* free old buffer */
-	MEM_freeN(old_points);
-}
-
-
-/* make a new stroke from the buffer data */
-static void gp_stroke_newfrombuffer (tGPsdata *p)
-{
-	bGPdata *gpd= p->gpd;
-	bGPDstroke *gps;
-	bGPDspoint *pt;
-	tGPspoint *ptc;
-	int i, totelem;
-	int ctrl= 0; // XXX
-	
-	/* get total number of points to allocate space for:
-	 *	- in 'Draw Mode', holding the Ctrl-Modifier will only take endpoints
-	 *	- otherwise, do whole stroke
-	 */
-	if (GP_BUFFER2STROKE_ENDPOINTS)
-		totelem = (gpd->sbuffer_size >= 2) ? 2: gpd->sbuffer_size;
-	else
-		totelem = gpd->sbuffer_size;
-	
-	/* exit with error if no valid points from this stroke */
-	if (totelem == 0) {
-		if (G.f & G_DEBUG) 
-			printf("Error: No valid points in stroke buffer to convert (tot=%d) \n", gpd->sbuffer_size);
-		return;
-	}
-	
-	/* allocate memory for a new stroke */
-	gps= MEM_callocN(sizeof(bGPDstroke), "gp_stroke");
-	
-	/* allocate enough memory for a continuous array for storage points */
-	pt= gps->points= MEM_callocN(sizeof(bGPDspoint)*totelem, "gp_stroke_points");
-	
-	/* copy appropriate settings for stroke */
-	gps->totpoints= totelem;
-	gps->thickness= p->gpl->thickness;
-	gps->flag= gpd->sbuffer_sflag;
-	
-	/* copy points from the buffer to the stroke */
-	if (GP_BUFFER2STROKE_ENDPOINTS) {
-		/* 'Draw Mode' + Ctrl-Modifier - only endpoints */
-		{
-			/* first point */
-			ptc= gpd->sbuffer;
-			
-			/* convert screen-coordinates to appropriate coordinates (and store them) */
-			gp_stroke_convertcoords(p, &ptc->x, &pt->x);
-			
-			/* copy pressure */
-			pt->pressure= ptc->pressure;
-			
-			pt++;
-		}
-			
-		if (totelem == 2) {
-			/* last point if applicable */
-			ptc= ((tGPspoint *)gpd->sbuffer) + (gpd->sbuffer_size - 1);
-			
-			/* convert screen-coordinates to appropriate coordinates (and store them) */
-			gp_stroke_convertcoords(p, &ptc->x, &pt->x);
-			
-			/* copy pressure */
-			pt->pressure= ptc->pressure;
-		}
-	}
-	else {
-		/* convert all points (normal behaviour) */
-		for (i=0, ptc=gpd->sbuffer; i < gpd->sbuffer_size && ptc; i++, ptc++) {
-			/* convert screen-coordinates to appropriate coordinates (and store them) */
-			gp_stroke_convertcoords(p, &ptc->x, &pt->x);
-			
-			/* copy pressure */
-			pt->pressure= ptc->pressure;
-			
-			pt++;
-		}
-	}
-	
-	/* add stroke to frame */
-	BLI_addtail(&p->gpf->strokes, gps);
-}
-
-/* --- 'Eraser' for 'Paint' Tool ------ */
-
-/* eraser tool - remove segment from stroke/split stroke (after lasso inside) */
-static short gp_stroke_eraser_splitdel (bGPDframe *gpf, bGPDstroke *gps, int i)
-{
-	bGPDspoint *pt_tmp= gps->points;
-	bGPDstroke *gsn = NULL;
-
-	/* if stroke only had two points, get rid of stroke */
-	if (gps->totpoints == 2) {
-		/* free stroke points, then stroke */
-		MEM_freeN(pt_tmp);
-		BLI_freelinkN(&gpf->strokes, gps);
-		
-		/* nothing left in stroke, so stop */
-		return 1;
-	}
-
-	/* if last segment, just remove segment from the stroke */
-	else if (i == gps->totpoints - 2) {
-		/* allocate new points array, and assign most of the old stroke there */
-		gps->totpoints--;
-		gps->points= MEM_callocN(sizeof(bGPDspoint)*gps->totpoints, "gp_stroke_points");
-		memcpy(gps->points, pt_tmp, sizeof(bGPDspoint)*gps->totpoints);
-		
-		/* free temp buffer */
-		MEM_freeN(pt_tmp);
-		
-		/* nothing left in stroke, so stop */
-		return 1;
-	}
-
-	/* if first segment, just remove segment from the stroke */
-	else if (i == 0) {
-		/* allocate new points array, and assign most of the old stroke there */
-		gps->totpoints--;
-		gps->points= MEM_callocN(sizeof(bGPDspoint)*gps->totpoints, "gp_stroke_points");
-		memcpy(gps->points, pt_tmp + 1, sizeof(bGPDspoint)*gps->totpoints);
-		
-		/* free temp buffer */
-		MEM_freeN(pt_tmp);
-		
-		/* no break here, as there might still be stuff to remove in this stroke */
-		return 0;
-	}
-
-	/* segment occurs in 'middle' of stroke, so split */
-	else {
-		/* duplicate stroke, and assign 'later' data to that stroke */
-		gsn= MEM_dupallocN(gps);
-		gsn->prev= gsn->next= NULL;
-		BLI_insertlinkafter(&gpf->strokes, gps, gsn);
-		
-		gsn->totpoints= gps->totpoints - i;
-		gsn->points= MEM_callocN(sizeof(bGPDspoint)*gsn->totpoints, "gp_stroke_points");
-		memcpy(gsn->points, pt_tmp + i, sizeof(bGPDspoint)*gsn->totpoints);
-		
-		/* adjust existing stroke  */
-		gps->totpoints= i;
-		gps->points= MEM_callocN(sizeof(bGPDspoint)*gps->totpoints, "gp_stroke_points");
-		memcpy(gps->points, pt_tmp, sizeof(bGPDspoint)*i);
-		
-		/* free temp buffer */
-		MEM_freeN(pt_tmp);
-		
-		/* nothing left in stroke, so stop */
-		return 1;
-	}
-}
-
-/* eraser tool - check if part of stroke occurs within last segment drawn by eraser */
-static short gp_stroke_eraser_strokeinside (short mval[], short mvalo[], short rad, short x0, short y0, short x1, short y1)
-{
-	/* simple within-radius check for now */
-	if (edge_inside_circle(mval[0], mval[1], rad, x0, y0, x1, y1))
-		return 1;
-	
-	/* not inside */
-	return 0;
-} 
-
-/* eraser tool - evaluation per stroke */
-static void gp_stroke_eraser_dostroke (tGPsdata *p, short mval[], short mvalo[], short rad, rcti *rect, bGPDframe *gpf, bGPDstroke *gps)
-{
-	bGPDspoint *pt1, *pt2;
-	int x0=0, y0=0, x1=0, y1=0;
-	short xyval[2];
-	int i;
-	
-	if (gps->totpoints == 0) {
-		/* just free stroke */
-		if (gps->points) 
-			MEM_freeN(gps->points);
-		BLI_freelinkN(&gpf->strokes, gps);
-	}
-	else if (gps->totpoints == 1) {
-		/* get coordinates */
-		if (gps->flag & GP_STROKE_3DSPACE) {
-			project_short(p->ar, &gps->points->x, xyval);
-			x0= xyval[0];
-			y0= xyval[1];
-		}
-		else if (gps->flag & GP_STROKE_2DSPACE) {			
-			UI_view2d_view_to_region(p->v2d, gps->points->x, gps->points->y, &x0, &y0);
-		}
-		else if (gps->flag & GP_STROKE_2DIMAGE) {			
-			int offsx, offsy, sizex, sizey;
-			
-			/* get stored settings */
-			sizex= p->im2d_settings.sizex;
-			sizey= p->im2d_settings.sizey;
-			offsx= p->im2d_settings.offsx;
-			offsy= p->im2d_settings.offsy;
-			
-			/* calculate new points */
-			x0= (short)((gps->points->x * sizex) + offsx);
-			y0= (short)((gps->points->y * sizey) + offsy);
-		}
-		else {
-			x0= (short)(gps->points->x / 1000 * p->sa->winx);
-			y0= (short)(gps->points->y / 1000 * p->sa->winy);
-		}
-		
-		/* do boundbox check first */
-		if (BLI_in_rcti(rect, x0, y0)) {
-			/* only check if point is inside */
-			if ( ((x0-mval[0])*(x0-mval[0]) + (y0-mval[1])*(y0-mval[1])) <= rad*rad ) {
-				/* free stroke */
-				MEM_freeN(gps->points);
-				BLI_freelinkN(&gpf->strokes, gps);
-			}
-		}
-	}
-	else {	
-		/* loop over the points in the stroke, checking for intersections 
-		 * 	- an intersection will require the stroke to be split
-		 */
-		for (i=0; (i+1) < gps->totpoints; i++) {
-			/* get points to work with */
-			pt1= gps->points + i;
-			pt2= gps->points + i + 1;
-			
-			/* get coordinates */
-			if (gps->flag & GP_STROKE_3DSPACE) {
-				project_short(p->ar, &pt1->x, xyval);
-				x0= xyval[0];
-				y0= xyval[1];
-				
-				project_short(p->ar, &pt2->x, xyval);
-				x1= xyval[0];
-				y1= xyval[1];
-			}
-			else if (gps->flag & GP_STROKE_2DSPACE) {
-				UI_view2d_view_to_region(p->v2d, pt1->x, pt1->y, &x0, &y0);
-				
-				UI_view2d_view_to_region(p->v2d, pt2->x, pt2->y, &x1, &y1);
-			}
-			else if (gps->flag & GP_STROKE_2DIMAGE) {
-				int offsx, offsy, sizex, sizey;
-				
-				/* get stored settings */
-				sizex= p->im2d_settings.sizex;
-				sizey= p->im2d_settings.sizey;
-				offsx= p->im2d_settings.offsx;
-				offsy= p->im2d_settings.offsy;
-				
-				/* calculate new points */
-				x0= (short)((pt1->x * sizex) + offsx);
-				y0= (short)((pt1->y * sizey) + offsy);
-				
-				x1= (short)((pt2->x * sizex) + offsx);
-				y1= (short)((pt2->y * sizey) + offsy);
-			}
-			else {
-				x0= (short)(pt1->x / 1000 * p->sa->winx);
-				y0= (short)(pt1->y / 1000 * p->sa->winy);
-				x1= (short)(pt2->x / 1000 * p->sa->winx);
-				y1= (short)(pt2->y / 1000 * p->sa->winy);
-			}
-			
-			/* check that point segment of the boundbox of the eraser stroke */
-			if (BLI_in_rcti(rect, x0, y0) || BLI_in_rcti(rect, x1, y1)) {
-				/* check if point segment of stroke had anything to do with
-				 * eraser region  (either within stroke painted, or on its lines)
-				 * 	- this assumes that linewidth is irrelevant
-				 */
-				if (gp_stroke_eraser_strokeinside(mval, mvalo, rad, x0, y0, x1, y1)) {
-					/* if function returns true, break this loop (as no more point to check) */
-					if (gp_stroke_eraser_splitdel(gpf, gps, i))
-						break;
-				}
-			}
-		}
-	}
-}
-
-/* erase strokes which fall under the eraser strokes */
-static void gp_stroke_doeraser (tGPsdata *p)
-{
-	bGPDframe *gpf= p->gpf;
-	bGPDstroke *gps, *gpn;
-	rcti rect;
-	
-	/* rect is rectangle of eraser */
-	rect.xmin= p->mval[0] - p->radius;
-	rect.ymin= p->mval[1] - p->radius;
-	rect.xmax= p->mval[0] + p->radius;
-	rect.ymax= p->mval[1] + p->radius;
-	
-	/* loop over strokes, checking segments for intersections */
-	for (gps= gpf->strokes.first; gps; gps= gpn) {
-		gpn= gps->next;
-		gp_stroke_eraser_dostroke(p, p->mval, p->mvalo, p->radius, &rect, gpf, gps);
-	}
-}
-
-/* ---------- 'Paint' Tool ------------ */
-
-/* init new painting session */
-static void gp_session_initpaint (bContext *C, tGPsdata *p)
-{
-	ScrArea *curarea= CTX_wm_area(C);
-	ARegion *ar= CTX_wm_region(C);
-	
-	/* clear previous data (note: is on stack) */
-	memset(p, 0, sizeof(tGPsdata));
-	
-	/* make sure the active view (at the starting time) is a 3d-view */
-	if (curarea == NULL) {
-		p->status= GP_STATUS_ERROR;
-		if (G.f & G_DEBUG) 
-			printf("Error: No active view for painting \n");
-		return;
-	}
-	
-	/* pass on current scene */
-	p->scene= CTX_data_scene(C);
-	
-	switch (curarea->spacetype) {
-		/* supported views first */
-		case SPACE_VIEW3D:
-		{
-			View3D *v3d= curarea->spacedata.first;
-			
-			/* set current area */
-			p->sa= curarea;
-			p->ar= ar;
-			
-			/* check that gpencil data is allowed to be drawn */
-			if ((v3d->flag2 & V3D_DISPGP)==0) {
-				p->status= GP_STATUS_ERROR;
-				if (G.f & G_DEBUG) 
-					printf("Error: In active view, Grease Pencil not shown \n");
-				return;
-			}
-		}
-			break;
-		case SPACE_NODE:
-		{
-			SpaceNode *snode= curarea->spacedata.first;
-			
-			/* set current area */
-			p->sa= curarea;
-			p->ar= ar;
-			p->v2d= &ar->v2d;
-			
-			/* check that gpencil data is allowed to be drawn */
-			if ((snode->flag & SNODE_DISPGP)==0) {
-				p->status= GP_STATUS_ERROR;
-				if (G.f & G_DEBUG) 
-					printf("Error: In active view, Grease Pencil not shown \n");
-				return;
-			}
-		}
-			break;
-		case SPACE_SEQ:
-		{
-			SpaceSeq *sseq= curarea->spacedata.first;
-			
-			/* set current area */
-			p->sa= curarea;
-			p->ar= ar;
-			p->v2d= &ar->v2d;
-			
-			/* check that gpencil data is allowed to be drawn */
-			if (sseq->mainb == SEQ_DRAW_SEQUENCE) {
-				p->status= GP_STATUS_ERROR;
-				if (G.f & G_DEBUG) 
-					printf("Error: In active view (sequencer), active mode doesn't support Grease Pencil \n");
-				return;
-			}
-			if ((sseq->flag & SEQ_DRAW_GPENCIL)==0) {
-				p->status= GP_STATUS_ERROR;
-				if (G.f & G_DEBUG) 
-					printf("Error: In active view, Grease Pencil not shown \n");
-				return;
-			}
-		}
-			break;	
-		case SPACE_IMAGE:
-		{
-			SpaceImage *sima= curarea->spacedata.first;
-			
-			/* set the current area */
-			p->sa= curarea;
-			p->ar= ar;
-			p->v2d= &ar->v2d;
-			p->ibuf= BKE_image_get_ibuf(sima->image, &sima->iuser);
-			
-			/* check that gpencil data is allowed to be drawn */
-			if ((sima->flag & SI_DISPGP)==0) {
-				p->status= GP_STATUS_ERROR;
-				if (G.f & G_DEBUG)
-					printf("Error: In active view, Grease Pencil not shown \n");
-				return;
-			}
-		}
-			break;
-		/* unsupported views */
-		default:
-		{
-			p->status= GP_STATUS_ERROR;
-			if (G.f & G_DEBUG) 
-				printf("Error: Active view not appropriate for Grease Pencil drawing \n");
-			return;
-		}
-			break;
-	}
-	
-	/* get gp-data */
-	p->gpd= gpencil_data_getactive(p->sa);
-	if (p->gpd == NULL) {
-		short ok;
-		
-		p->gpd= gpencil_data_addnew();
-		ok= gpencil_data_setactive(p->sa, p->gpd);
-		
-		/* most of the time, the following check isn't needed */
-		if (ok == 0) {
-			/* free gpencil data as it can't be used */
-			free_gpencil_data(p->gpd);
-			p->gpd= NULL;
-			p->status= GP_STATUS_ERROR;
-			if (G.f & G_DEBUG) 
-				printf("Error: Could not assign newly created Grease Pencil data to active area \n");
-			return;
-		}
-	}
-	
-	/* set edit flags */
-	G.f |= G_GREASEPENCIL;
-	
-	/* clear out buffer (stored in gp-data) in case something contaminated it */
-	gp_session_validatebuffer(p);
-	
-	/* set 'default' im2d_settings just in case something that uses this doesn't set it */
-	p->im2d_settings.sizex= 1;
-	p->im2d_settings.sizey= 1;
-}
-
-/* cleanup after a painting session */
-static void gp_session_cleanup (tGPsdata *p)
-{
-	bGPdata *gpd= p->gpd;
-	
-	/* error checking */
-	if (gpd == NULL)
-		return;
-	
-	/* free stroke buffer */
-	if (gpd->sbuffer) {
-		MEM_freeN(gpd->sbuffer);
-		gpd->sbuffer= NULL;
-	}
-	
-	/* clear flags */
-	gpd->sbuffer_size= 0;
-	gpd->sbuffer_sflag= 0;
-}
-
-/* init new stroke */
-static void gp_paint_initstroke (tGPsdata *p, short paintmode)
-{	
-	/* get active layer (or add a new one if non-existent) */
-	p->gpl= gpencil_layer_getactive(p->gpd);
-	if (p->gpl == NULL)
-		p->gpl= gpencil_layer_addnew(p->gpd);
-	if (p->gpl->flag & GP_LAYER_LOCKED) {
-		p->status= GP_STATUS_ERROR;
-		if (G.f & G_DEBUG)
-			printf("Error: Cannot paint on locked layer \n");
-		return;
-	}
-		
-	/* get active frame (add a new one if not matching frame) */
-	p->gpf= gpencil_layer_getframe(p->gpl, p->scene->r.cfra, 1);
-	if (p->gpf == NULL) {
-		p->status= GP_STATUS_ERROR;
-		if (G.f & G_DEBUG) 
-			printf("Error: No frame created (gpencil_paint_init) \n");
-		return;
-	}
-	else
-		p->gpf->flag |= GP_FRAME_PAINT;
-	
-	/* set 'eraser' for this stroke if using eraser */
-	p->paintmode= paintmode;
-	if (p->paintmode == GP_PAINTMODE_ERASER)
-		p->gpd->sbuffer_sflag |= GP_STROKE_ERASER;
-	
-	/* check if points will need to be made in view-aligned space */
-	if (p->gpd->flag & GP_DATA_VIEWALIGN) {
-		switch (p->sa->spacetype) {
-			case SPACE_VIEW3D:
-			{
-				View3D *v3d= (View3D *)p->sa->spacedata.first;
-				RegionView3D *rv3d= NULL; // XXX
-				float *fp= give_cursor(p->scene, v3d);
-				
-				initgrabz(rv3d, fp[0], fp[1], fp[2]);
-				
-				p->gpd->sbuffer_sflag |= GP_STROKE_3DSPACE;
-			}
-				break;
-			case SPACE_NODE:
-			{
-				p->gpd->sbuffer_sflag |= GP_STROKE_2DSPACE;
-			}
-				break;
-			case SPACE_SEQ:
-			{
-				SpaceSeq *sseq= (SpaceSeq *)p->sa->spacedata.first;
-				int rectx, recty;
-				float zoom, zoomx, zoomy;
-				
-				/* set draw 2d-stroke flag */
-				p->gpd->sbuffer_sflag |= GP_STROKE_2DIMAGE;
-				
-				/* calculate zoom factor */
-				zoom= (float)(SEQ_ZOOM_FAC(sseq->zoom));
-				if (sseq->mainb == SEQ_DRAW_IMG_IMBUF) {
-					zoomx = zoom * ((float)p->scene->r.xasp / (float)p->scene->r.yasp);
-					zoomy = zoom;
-				} 
-				else
-					zoomx = zoomy = zoom;
-				
-				/* calculate rect size to use to calculate the size of the drawing area
-				 *	- We use the size of the output image not the size of the ibuf being shown
-				 *	  as it is too messy getting the ibuf (and could be too slow). This should be
-				 *	  a reasonable for most cases anyway.
-				 */
-				rectx= (p->scene->r.size * p->scene->r.xsch) / 100;
-				recty= (p->scene->r.size * p->scene->r.ysch) / 100; 
-				
-				/* set offset and scale values for opertations to use */
-				p->im2d_settings.sizex= (int)(zoomx * rectx);
-				p->im2d_settings.sizey= (int)(zoomy * recty);
-				p->im2d_settings.offsx= (int)((p->sa->winx-p->im2d_settings.sizex)/2 + sseq->xof);
-				p->im2d_settings.offsy= (int)((p->sa->winy-p->im2d_settings.sizey)/2 + sseq->yof);
-			}
-				break;
-			case SPACE_IMAGE:
-			{
-				/* check if any ibuf available */
-				if (p->ibuf)
-					p->gpd->sbuffer_sflag |= GP_STROKE_2DSPACE;
-			}
-				break;
-		}
-	}
-}
-
-/* finish off a stroke (clears buffer, but doesn't finish the paint operation) */
-static void gp_paint_strokeend (tGPsdata *p)
-{
-	/* check if doing eraser or not */
-	if ((p->gpd->sbuffer_sflag & GP_STROKE_ERASER) == 0) {
-		/* smooth stroke before transferring? */
-		gp_stroke_smooth(p);
-		
-		/* simplify stroke before transferring? */
-		gp_stroke_simplify(p);
-		
-		/* transfer stroke to frame */
-		gp_stroke_newfrombuffer(p);
-	}
-	
-	/* clean up buffer now */
-	gp_session_validatebuffer(p);
-}
-
-/* finish off stroke painting operation */
-static void gp_paint_cleanup (tGPsdata *p)
-{
-	/* finish off a stroke */
-	gp_paint_strokeend(p);
-	
-	/* "unlock" frame */
-	p->gpf->flag &= ~GP_FRAME_PAINT;
-	
-	/* add undo-push so stroke can be undone */
-	/* FIXME: currently disabled, as it's impossible to get this working nice
-	 * as gpenci data is on currently screen-level (which isn't saved to undo files)
-	 */
-	//BIF_undo_push("GPencil Stroke");
-	
-	/* force redraw after drawing action */
-	// XXX force_draw_plus(SPACE_ACTION, 0);
-}
-
-/* -------- */
-
-/* main call to paint a new stroke */
-// XXX will become modal(), gets event, includes all info!
-short gpencil_paint (bContext *C, short paintmode)
-{
-	tGPsdata p;
-	short ok = GP_STROKEADD_NORMAL;
-	
-	/* init paint-data */
-	gp_session_initpaint(C, &p);
-	if (p.status == GP_STATUS_ERROR) {
-		gp_session_cleanup(&p);
-		return 0;
-	}
-	gp_paint_initstroke(&p, paintmode);
-	if (p.status == GP_STATUS_ERROR) {
-		gp_session_cleanup(&p);
-		return 0;
-	}
-	
-	/* set cursor to indicate drawing */
-	// XXX (cursor callbacks in regiontype) setcursor_space(p.sa->spacetype, CURSOR_VPAINT);
-	
-	/* init drawing-device settings */
-	// XXX getmouseco_areawin(p.mval);
-	// XXX p.pressure = get_pressure();
-	
-	p.mvalo[0]= p.mval[0];
-	p.mvalo[1]= p.mval[1];
-	p.opressure= p.pressure;
-	
-	/* radius for eraser circle is defined in userprefs now */
-	// TODO: make this more easily tweaked... 
-	p.radius= U.gp_eraser;
-	
-	/* start drawing eraser-circle (if applicable) */
-	//if (paintmode == GP_PAINTMODE_ERASER)
-	// XXX	draw_sel_circle(p.mval, NULL, p.radius, p.radius, 0); // draws frontbuffer, but sets backbuf again
-	
-	/* only allow painting of single 'dots' if: 
-	 *	- pressure is not excessive (as it can be on some windows tablets)
-	 *	- draw-mode for active datablock is turned on
-	 * 	- not erasing
-	 */
-	if (paintmode != GP_PAINTMODE_ERASER) {
-		if (!(p.pressure >= 0.99f) || (p.gpd->flag & GP_DATA_EDITPAINT)) { 
-			gp_stroke_addpoint(&p, p.mval, p.pressure);
-		}
-	}
-	
-	/* XXX paint loop */
-	if(0) {
-		/* get current user input */
-		// XXX getmouseco_areawin(p.mval);
-		// XXX p.pressure = get_pressure();
-		
-		/* only add current point to buffer if mouse moved (otherwise wait until it does) */
-		if (paintmode == GP_PAINTMODE_ERASER) {
-			/* do 'live' erasing now */
-			gp_stroke_doeraser(&p);
-			
-			// XXX draw_sel_circle(p.mval, p.mvalo, p.radius, p.radius, 0);
-			// XXX force_draw(0);
-			
-			p.mvalo[0]= p.mval[0];
-			p.mvalo[1]= p.mval[1];
-			p.opressure= p.pressure;
-		}
-		else if (gp_stroke_filtermval(&p, p.mval, p.mvalo)) {
-			/* try to add point */
-			ok= gp_stroke_addpoint(&p, p.mval, p.pressure);
-			
-			/* handle errors while adding point */
-			if ((ok == GP_STROKEADD_FULL) || (ok == GP_STROKEADD_OVERFLOW)) {
-				/* finish off old stroke */
-				gp_paint_strokeend(&p);
-				
-				/* start a new stroke, starting from previous point */
-				gp_stroke_addpoint(&p, p.mvalo, p.opressure);
-				ok= gp_stroke_addpoint(&p, p.mval, p.pressure);
-			}
-			else if (ok == GP_STROKEADD_INVALID) {
-				/* the painting operation cannot continue... */
-				error("Cannot paint stroke");
-				p.status = GP_STATUS_ERROR;
-				
-				if (G.f & G_DEBUG) 
-					printf("Error: Grease-Pencil Paint - Add Point Invalid \n");
-				// XXX break;
-			}
-			// XXX force_draw(0);
-			
-			p.mvalo[0]= p.mval[0];
-			p.mvalo[1]= p.mval[1];
-			p.opressure= p.pressure;
-		}
-		
-		/* do mouse checking at the end, so don't check twice, and potentially
-		 * miss a short tap 
-		 */
-	}
-	
-	/* clear edit flags */
-	G.f &= ~G_GREASEPENCIL;
-	
-	/* restore cursor to indicate end of drawing */
-	// XXX  (cursor callbacks in regiontype) setcursor_space(p.sa->spacetype, CURSOR_STD);
-	
-	/* check size of buffer before cleanup, to determine if anything happened here */
-	if (paintmode == GP_PAINTMODE_ERASER) {
-		ok= 1; /* assume that we did something... */
-		// XXX draw_sel_circle(NULL, p.mvalo, 0, p.radius, 0);
-	}
-	else
-		ok= p.gpd->sbuffer_size;
-	
-	/* cleanup */
-	gp_paint_cleanup(&p);
-	gp_session_cleanup(&p);
-	
-	/* done! return if a stroke was successfully added */
-	return ok;
-}
-
-
-/* All event (loops) handling checking if stroke drawing should be initiated
- * should call this function.
- */
-short gpencil_do_paint (bContext *C)
-{
-	ScrArea *sa= CTX_wm_area(C);
-	bGPdata *gpd = gpencil_data_getactive(sa);
-	short retval= 0;
-	int alt= 0, shift= 0, mbut= 0; // XXX
-	
-	/* check if possible to do painting */
-	if (gpd == NULL) 
-		return 0;
-	
-	/* currently, we will only 'paint' if:
-	 * 	1. draw-mode on gpd is set (for accessibility reasons)
-	 *		a) single dots are only available by this method if a single click is made
-	 *		b) a straight line is drawn if ctrl-modifier is held (check is done when stroke is converted!)
-	 *	2. if shift-modifier is held + lmb -> 'quick paint'
-	 *
-	 *	OR
-	 * 
-	 * draw eraser stroke if:
-	 *	1. using the eraser on a tablet
-	 *	2. draw-mode on gpd is set (for accessiblity reasons)
-	 *		(eraser is mapped to right-mouse)
-	 *	3. Alt + 'select' mouse-button
-	 *		i.e.  if LMB = select: Alt-LMB
-	 *			  if RMB = select: Alt-RMB
-	 */
-	if (get_activedevice() == 2) {
-		/* eraser on a tablet - always try to erase strokes */
-		retval = gpencil_paint(C, GP_PAINTMODE_ERASER);
-	}
-	else if (gpd->flag & GP_DATA_EDITPAINT) {
-		/* try to paint/erase */
-		if (mbut == L_MOUSE)
-			retval = gpencil_paint(C, GP_PAINTMODE_DRAW);
-		else if (mbut == R_MOUSE)
-			retval = gpencil_paint(C, GP_PAINTMODE_ERASER);
-	}
-	else if (!(gpd->flag & GP_DATA_LMBPLOCK)) {
-		/* try to paint/erase as not locked */
-		if (shift && (mbut == L_MOUSE)) {
-			retval = gpencil_paint(C, GP_PAINTMODE_DRAW);
-		}
-		else if (alt) {
-			if ((U.flag & USER_LMOUSESELECT) && (mbut == L_MOUSE))
-				retval = gpencil_paint(C, GP_PAINTMODE_ERASER);
-			else if (!(U.flag & USER_LMOUSESELECT) && (mbut == R_MOUSE))
-				retval = gpencil_paint(C, GP_PAINTMODE_ERASER);
-		}
-	}
-	
-	/* return result of trying to paint */
-	return retval;
-}
-
-/* ************************************************** */