Differential D2889 Diff 11226 source/blender/editors/gpencil/gpencil_utils.c

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source/blender/editors/gpencil/gpencil_utils.c

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#include "MEM_guardedalloc.h"		#include "MEM_guardedalloc.h"

#include "BLI_math.h"		#include "BLI_math.h"
#include "BLI_blenlib.h"		#include "BLI_blenlib.h"
#include "BLI_utildefines.h"		#include "BLI_utildefines.h"
#include "BLT_translation.h"		#include "BLT_translation.h"
#include "BLI_rand.h"		#include "BLI_rand.h"

		#include "DNA_meshdata_types.h"
#include "DNA_gpencil_types.h"		#include "DNA_gpencil_types.h"
		#include "DNA_brush_types.h"
#include "DNA_object_types.h"		#include "DNA_object_types.h"
#include "DNA_scene_types.h"		#include "DNA_scene_types.h"
#include "DNA_screen_types.h"		#include "DNA_screen_types.h"
#include "DNA_space_types.h"		#include "DNA_space_types.h"
#include "DNA_view3d_types.h"		#include "DNA_view3d_types.h"

#include "BKE_action.h"		#include "BKE_action.h"
		#include "BKE_main.h"
		#include "BKE_brush.h"
#include "BKE_context.h"		#include "BKE_context.h"
#include "BKE_gpencil.h"		#include "BKE_gpencil.h"
#include "BKE_main.h"		#include "BKE_object.h"
		#include "BKE_paint.h"
		#include "BKE_material.h"
#include "BKE_tracking.h"		#include "BKE_tracking.h"

#include "WM_api.h"		#include "WM_api.h"

#include "RNA_access.h"		#include "RNA_access.h"
#include "RNA_define.h"		#include "RNA_define.h"
#include "RNA_enum_types.h"		#include "RNA_enum_types.h"

#include "UI_resources.h"		#include "UI_resources.h"
#include "UI_view2d.h"		#include "UI_view2d.h"

#include "ED_gpencil.h"		#include "ED_gpencil.h"
#include "ED_clip.h"		#include "ED_clip.h"
#include "ED_view3d.h"		#include "ED_view3d.h"
		#include "ED_object.h"
		#include "ED_screen.h"

		#include "GPU_immediate.h"
		#include "GPU_immediate_util.h"

#include "DEG_depsgraph.h"		#include "DEG_depsgraph.h"
		#include "DEG_depsgraph_query.h"

#include "gpencil_intern.h"		#include "gpencil_intern.h"

/* ******************************************************** */		/* ******************************************************** */
/* Context Wrangling... */		/* Context Wrangling... */

/* Get pointer to active Grease Pencil datablock, and an RNA-pointer to trace back to whatever owns it,		/* Get pointer to active Grease Pencil datablock, and an RNA-pointer to trace back to whatever owns it,
* when context info is not available.		* when context info is not available.
*/		*/
bGPdata *ED_gpencil_data_get_pointers_direct(ID screen_id, Scene scene, ScrArea sa, Object ob, PointerRNA ptr)		bGPdata *ED_gpencil_data_get_pointers_direct(ID screen_id, ScrArea sa, Object ob, PointerRNA *r_ptr)
{		{
/* if there's an active area, check if the particular editor may		/* if there's an active area, check if the particular editor may
* have defined any special Grease Pencil context for editing...		* have defined any special Grease Pencil context for editing...
*/		*/
if (sa) {		if (sa) {
SpaceLink *sl = sa->spacedata.first;		SpaceLink *sl = sa->spacedata.first;

switch (sa->spacetype) {		switch (sa->spacetype) {
case SPACE_VIEW3D: /* 3D-View */		case SPACE_VIEW3D: /* 3D-View */
{		case SPACE_BUTS: /* properties */
BLI_assert(scene && ELEM(scene->toolsettings->gpencil_src,		case SPACE_INFO: /* header info (needed after workspaces merge) */
GP_TOOL_SOURCE_SCENE, GP_TOOL_SOURCE_OBJECT));		case SPACE_TOPBAR: /* Topbar (needed after topbar merge) */
		{
if (scene->toolsettings->gpencil_src == GP_TOOL_SOURCE_OBJECT) {		/* return obgpencil datablock */
/* legacy behaviour for usage with old addons requiring object-linked to objects */		if (ob && (ob->type == OB_GPENCIL)) {
		if (r_ptr) RNA_id_pointer_create(&ob->id, r_ptr);
/* just in case no active/selected object... */		return (bGPdata **)&ob->data;
if (ob && (ob->flag & SELECT)) {
/* for now, as long as there's an object, default to using that in 3D-View */
if (ptr) RNA_id_pointer_create(&ob->id, ptr);
return &ob->gpd;
}
/* else: defaults to scene... */
}		}
else {		else {
if (ptr) RNA_id_pointer_create(&scene->id, ptr);		return NULL;
return &scene->gpd;
}		}

break;		break;
}		}
case SPACE_NODE: /* Nodes Editor */		case SPACE_NODE: /* Nodes Editor */
{		{
SpaceNode snode = (SpaceNode )sl;		SpaceNode snode = (SpaceNode )sl;

/* return the GP data for the active node block/node */		/* return the GP data for the active node block/node */
if (snode && snode->nodetree) {		if (snode && snode->nodetree) {
/* for now, as long as there's an active node tree, default to using that in the Nodes Editor */		/* for now, as long as there's an active node tree, default to using that in the Nodes Editor */
if (ptr) RNA_id_pointer_create(&snode->nodetree->id, ptr);		if (r_ptr) RNA_id_pointer_create(&snode->nodetree->id, r_ptr);
return &snode->nodetree->gpd;		return &snode->nodetree->gpd;
}		}

/* even when there is no node-tree, don't allow this to flow to scene */		/* even when there is no node-tree, don't allow this to flow to scene */
return NULL;		return NULL;
}		}
case SPACE_SEQ: /* Sequencer */		case SPACE_SEQ: /* Sequencer */
{		{
SpaceSeq sseq = (SpaceSeq )sl;		SpaceSeq sseq = (SpaceSeq )sl;

/* for now, Grease Pencil data is associated with the space (actually preview region only) */		/* for now, Grease Pencil data is associated with the space (actually preview region only) */
/* XXX our convention for everything else is to link to data though... */		/* XXX our convention for everything else is to link to data though... */
if (ptr) RNA_pointer_create(screen_id, &RNA_SpaceSequenceEditor, sseq, ptr);		if (r_ptr) RNA_pointer_create(screen_id, &RNA_SpaceSequenceEditor, sseq, r_ptr);
return &sseq->gpd;		return &sseq->gpd;
}		}
case SPACE_IMAGE: /* Image/UV Editor */		case SPACE_IMAGE: /* Image/UV Editor */
{		{
SpaceImage sima = (SpaceImage )sl;		SpaceImage sima = (SpaceImage )sl;

/* for now, Grease Pencil data is associated with the space... */		/* for now, Grease Pencil data is associated with the space... */
/* XXX our convention for everything else is to link to data though... */		/* XXX our convention for everything else is to link to data though... */
if (ptr) RNA_pointer_create(screen_id, &RNA_SpaceImageEditor, sima, ptr);		if (r_ptr) RNA_pointer_create(screen_id, &RNA_SpaceImageEditor, sima, r_ptr);
return &sima->gpd;		return &sima->gpd;
}		}
case SPACE_CLIP: /* Nodes Editor */		case SPACE_CLIP: /* Nodes Editor */
{		{
SpaceClip sc = (SpaceClip )sl;		SpaceClip sc = (SpaceClip )sl;
MovieClip *clip = ED_space_clip_get_clip(sc);		MovieClip *clip = ED_space_clip_get_clip(sc);

if (clip) {		if (clip) {
if (sc->gpencil_src == SC_GPENCIL_SRC_TRACK) {		if (sc->gpencil_src == SC_GPENCIL_SRC_TRACK) {
MovieTrackingTrack *track = BKE_tracking_track_get_active(&clip->tracking);		MovieTrackingTrack *track = BKE_tracking_track_get_active(&clip->tracking);

if (!track)		if (!track)
return NULL;		return NULL;

if (ptr)		if (r_ptr) RNA_pointer_create(&clip->id, &RNA_MovieTrackingTrack, track, r_ptr);
RNA_pointer_create(&clip->id, &RNA_MovieTrackingTrack, track, ptr);

return &track->gpd;		return &track->gpd;
}		}
else {		else {
if (ptr)		if (r_ptr) RNA_id_pointer_create(&clip->id, r_ptr);
RNA_id_pointer_create(&clip->id, ptr);

return &clip->gpd;		return &clip->gpd;
}		}
}		}
break;		break;
}		}
default: /* unsupported space */		default: /* unsupported space */
return NULL;		return NULL;
}		}
}		}

/* just fall back on the scene's GP data */		return NULL;
if (ptr) RNA_id_pointer_create((ID *)scene, ptr);
return (scene) ? &scene->gpd : NULL;
}		}

/* Get pointer to active Grease Pencil datablock, and an RNA-pointer to trace back to whatever owns it */		/* Get pointer to active Grease Pencil datablock, and an RNA-pointer to trace back to whatever owns it */
bGPdata *ED_gpencil_data_get_pointers(const bContext C, PointerRNA *ptr)		bGPdata *ED_gpencil_data_get_pointers(const bContext C, PointerRNA *r_ptr)
{		{
ID screen_id = (ID )CTX_wm_screen(C);		ID screen_id = (ID )CTX_wm_screen(C);
Scene *scene = CTX_data_scene(C);
ScrArea *sa = CTX_wm_area(C);		ScrArea *sa = CTX_wm_area(C);
Object *ob = CTX_data_active_object(C);		Object *ob = CTX_data_active_object(C);

return ED_gpencil_data_get_pointers_direct(screen_id, scene, sa, ob, ptr);		return ED_gpencil_data_get_pointers_direct(screen_id, sa, ob, r_ptr);
}		}

/* -------------------------------------------------------- */		/* -------------------------------------------------------- */

/* Get the active Grease Pencil datablock, when context is not available */		/* Get the active Grease Pencil datablock, when context is not available */
bGPdata ED_gpencil_data_get_active_direct(ID screen_id, Scene scene, ScrArea sa, Object *ob)		bGPdata ED_gpencil_data_get_active_direct(ID screen_id, ScrArea sa, Object ob)
{		{
bGPdata **gpd_ptr = ED_gpencil_data_get_pointers_direct(screen_id, scene, sa, ob, NULL);		bGPdata **gpd_ptr = ED_gpencil_data_get_pointers_direct(screen_id, sa, ob, NULL);
return (gpd_ptr) ? *(gpd_ptr) : NULL;		return (gpd_ptr) ? *(gpd_ptr) : NULL;
}		}

/* Get the active Grease Pencil datablock */		/**
		* Get the active Grease Pencil datablock
		* \note This is the original (bmain) copy of the datablock, stored in files.
		* Do not use for reading evaluated copies of GP Objects data
		*/
bGPdata ED_gpencil_data_get_active(const bContext C)		bGPdata ED_gpencil_data_get_active(const bContext C)
{		{
bGPdata **gpd_ptr = ED_gpencil_data_get_pointers(C, NULL);		bGPdata **gpd_ptr = ED_gpencil_data_get_pointers(C, NULL);
return (gpd_ptr) ? *(gpd_ptr) : NULL;		return (gpd_ptr) ? *(gpd_ptr) : NULL;
}		}

		/**
		* Get the evaluated copy of the active Grease Pencil datablock (where applicable)
		* - For the 3D View (i.e. "GP Objects"), this gives the evaluated copy of the GP datablock
		* (i.e. a copy of the active GP datablock for the active object, where modifiers have been
		* applied). This is needed to correctly work with "Copy-on-Write"
		* - For all other editors (i.e. "GP Annotations"), this just gives the active datablock
		* like for ED_gpencil_data_get_active()
		*/
		bGPdata ED_gpencil_data_get_active_evaluated(const bContext C)
		{
		ID screen_id = (ID )CTX_wm_screen(C);
		ScrArea *sa = CTX_wm_area(C);

		const Depsgraph *depsgraph = CTX_data_depsgraph(C);
		Object *ob = CTX_data_active_object(C);
		Object *ob_eval = DEG_get_evaluated_object(depsgraph, ob);

		/* if (ob && ob->type == OB_GPENCIL) BLI_assert(ob_eval->data == DEG_get_evaluated_id(ob->data)); */
		return ED_gpencil_data_get_active_direct(screen_id, sa, ob_eval);
		}

/* -------------------------------------------------------- */		/* -------------------------------------------------------- */

// XXX: this should be removed... We really shouldn't duplicate logic like this!		// XXX: this should be removed... We really shouldn't duplicate logic like this!
bGPdata ED_gpencil_data_get_active_v3d(Scene scene, ViewLayer *view_layer)		bGPdata ED_gpencil_data_get_active_v3d(ViewLayer view_layer)
{		{
Base *base = view_layer->basact;		Base *base = view_layer->basact;
bGPdata *gpd = NULL;		bGPdata *gpd = NULL;

/* We have to make sure active object is actually visible and selected, else we must use default scene gpd,		/* We have to make sure active object is actually visible and selected, else we must use default scene gpd,
* to be consistent with ED_gpencil_data_get_active's behavior.		* to be consistent with ED_gpencil_data_get_active's behavior.
*/		*/

if (base && TESTBASE(base)) {		if (base && TESTBASE(base)) {
		if (base->object->type == OB_GPENCIL)
		gpd = base->object->data;
		else
gpd = base->object->gpd;		gpd = base->object->gpd;
}		}
return gpd ? gpd : scene->gpd;		return gpd ? gpd : NULL;
}		}

/* ******************************************************** */		/* ******************************************************** */
/* Keyframe Indicator Checks */		/* Keyframe Indicator Checks */

/* Check whether there's an active GP keyframe on the current frame */		/* Check whether there's an active GP keyframe on the current frame */
bool ED_gpencil_has_keyframe_v3d(Scene scene, Object ob, int cfra)		bool ED_gpencil_has_keyframe_v3d(Scene UNUSED(scene), Object ob, int cfra)
{		{
/* just check both for now... */		if (ob && ob->data && (ob->type == OB_GPENCIL)) {
// XXX: this could get confusing (e.g. if only on the object, but other places don't show this)		bGPDlayer *gpl = BKE_gpencil_layer_getactive(ob->data);
if (scene->gpd) {
bGPDlayer *gpl = BKE_gpencil_layer_getactive(scene->gpd);
if (gpl) {
if (gpl->actframe) {
// XXX: assumes that frame has been fetched already
return (gpl->actframe->framenum == cfra);
}
else {
/* XXX: disabled as could be too much of a penalty */
/* return BKE_gpencil_layer_find_frame(gpl, cfra); */
}
}
}

if (ob && ob->gpd) {
bGPDlayer *gpl = BKE_gpencil_layer_getactive(ob->gpd);
if (gpl) {		if (gpl) {
if (gpl->actframe) {		if (gpl->actframe) {
// XXX: assumes that frame has been fetched already		// XXX: assumes that frame has been fetched already
return (gpl->actframe->framenum == cfra);		return (gpl->actframe->framenum == cfra);
}		}
else {		else {
/* XXX: disabled as could be too much of a penalty */		/* XXX: disabled as could be too much of a penalty */
/* return BKE_gpencil_layer_find_frame(gpl, cfra); */		/* return BKE_gpencil_layer_find_frame(gpl, cfra); */
Show All 22 Lines	int gp_active_layer_poll(bContext *C)

return (gpl != NULL);		return (gpl != NULL);
}		}

/* poll callback for checking if there is an active brush */		/* poll callback for checking if there is an active brush */
int gp_active_brush_poll(bContext *C)		int gp_active_brush_poll(bContext *C)
{		{
ToolSettings *ts = CTX_data_tool_settings(C);		ToolSettings *ts = CTX_data_tool_settings(C);
bGPDbrush *brush = BKE_gpencil_brush_getactive(ts);		Paint *paint = &ts->gp_paint->paint;
		if (paint) {
return (brush != NULL);		return (paint->brush != NULL);
}		}
		else {
/* poll callback for checking if there is an active palette */		return false;
int gp_active_palette_poll(bContext *C)
{
bGPdata *gpd = ED_gpencil_data_get_active(C);
bGPDpalette *palette = BKE_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 = BKE_gpencil_palette_getactive(gpd);
bGPDpalettecolor *palcolor = BKE_gpencil_palettecolor_getactive(palette);

return (palcolor != NULL);
}		}

/* ******************************************************** */		/* ******************************************************** */
/* Dynamic Enums of GP Layers */		/* Dynamic Enums of GP Layers */
/* NOTE: These include an option to create a new layer and use that... */		/* NOTE: These include an option to create a new layer and use that... */

/* Just existing layers */		/* Just existing layers */
const EnumPropertyItem *ED_gpencil_layers_enum_itemf(		const EnumPropertyItem *ED_gpencil_layers_enum_itemf(
▲ Show 20 Lines • Show All 73 Lines • ▼ Show 20 Lines	const EnumPropertyItem *ED_gpencil_layers_with_new_enum_itemf(

RNA_enum_item_end(&item, &totitem);		RNA_enum_item_end(&item, &totitem);
*r_free = true;		*r_free = true;

return item;		return item;
}		}



/* ******************************************************** */		/* ******************************************************** */
/* Brush Tool Core */		/* Brush Tool Core */

/**		/**
* Check whether a given stroke segment is inside a circular brush		* Check whether a given stroke segment is inside a circular brush
*		*
* \param mval The current screen-space coordinates (midpoint) of the brush		* \param mval The current screen-space coordinates (midpoint) of the brush
* \param mvalo The previous screen-space coordinates (midpoint) of the brush (NOT CURRENTLY USED)		* \param mvalo The previous screen-space coordinates (midpoint) of the brush (NOT CURRENTLY USED)
Show All 17 Lines	bool gp_stroke_inside_circle(const int mval[2], const int UNUSED(mvalo[2]),
/* not inside */		/* not inside */
return false;		return false;
}		}

/* ******************************************************** */		/* ******************************************************** */
/* Stroke Validity Testing */		/* Stroke Validity Testing */

/* Check whether given stroke can be edited given the supplied context */		/* Check whether given stroke can be edited given the supplied context */
// XXX: do we need additional flags for screenspace vs dataspace?		/* TODO: do we need additional flags for screenspace vs dataspace? */
bool ED_gpencil_stroke_can_use_direct(const ScrArea sa, const bGPDstroke gps)		bool ED_gpencil_stroke_can_use_direct(const ScrArea sa, const bGPDstroke gps)
{		{
/* sanity check */		/* sanity check */
if (ELEM(NULL, sa, gps))		if (ELEM(NULL, sa, gps))
return false;		return false;

/* filter stroke types by flags + spacetype */		/* filter stroke types by flags + spacetype */
if (gps->flag & GP_STROKE_3DSPACE) {		if (gps->flag & GP_STROKE_3DSPACE) {
/* 3D strokes - only in 3D view */		/* 3D strokes - only in 3D view */
return (sa->spacetype == SPACE_VIEW3D);		return ((sa->spacetype == SPACE_VIEW3D) \|\| (sa->spacetype == SPACE_BUTS));
}		}
else if (gps->flag & GP_STROKE_2DIMAGE) {		else if (gps->flag & GP_STROKE_2DIMAGE) {
/* Special "image" strokes - only in Image Editor */		/* Special "image" strokes - only in Image Editor */
return (sa->spacetype == SPACE_IMAGE);		return (sa->spacetype == SPACE_IMAGE);
}		}
else if (gps->flag & GP_STROKE_2DSPACE) {		else if (gps->flag & GP_STROKE_2DSPACE) {
/* 2D strokes (dataspace) - for any 2D view (i.e. everything other than 3D view) */		/* 2D strokes (dataspace) - for any 2D view (i.e. everything other than 3D view) */
return (sa->spacetype != SPACE_VIEW3D);		return (sa->spacetype != SPACE_VIEW3D);
}		}
else {		else {
/* view aligned - anything goes */		/* view aligned - anything goes */
return true;		return true;
}		}
}		}

/* Check whether given stroke can be edited in the current context */		/* Check whether given stroke can be edited in the current context */
bool ED_gpencil_stroke_can_use(const bContext C, const bGPDstroke gps)		bool ED_gpencil_stroke_can_use(const bContext C, const bGPDstroke gps)
{		{
ScrArea *sa = CTX_wm_area(C);		ScrArea *sa = CTX_wm_area(C);
return ED_gpencil_stroke_can_use_direct(sa, gps);		return ED_gpencil_stroke_can_use_direct(sa, gps);
}		}

/* Check whether given stroke can be edited for the current color */		/* Check whether given stroke can be edited for the current color */
bool ED_gpencil_stroke_color_use(const bGPDlayer gpl, const bGPDstroke gps)		bool ED_gpencil_stroke_color_use(Object ob, const bGPDlayer gpl, const bGPDstroke *gps)
{		{
/* check if the color is editable */		/* check if the color is editable */
bGPDpalettecolor *palcolor = gps->palcolor;		MaterialGPencilStyle *gp_style = BKE_material_gpencil_settings_get(ob, gps->mat_nr + 1);
if (palcolor != NULL) {
if (palcolor->flag & PC_COLOR_HIDE)		if (gp_style != NULL) {
		if (gp_style->flag & GP_STYLE_COLOR_HIDE)
return false;		return false;
if (((gpl->flag & GP_LAYER_UNLOCK_COLOR) == 0) && (palcolor->flag & PC_COLOR_LOCKED))		if (((gpl->flag & GP_LAYER_UNLOCK_COLOR) == 0) && (gp_style->flag & GP_STYLE_COLOR_LOCKED))
return false;		return false;
}		}

return true;		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 = BKE_gpencil_palette_getactive(gpd);
if (palette == NULL) {
palette = BKE_gpencil_palette_addnew(gpd, DATA_("GP_Palette"), true);
}
/* get color */
palcolor = BKE_gpencil_palettecolor_getbyname(palette, gps->colorname);
if (palcolor == NULL) {
if (gps->palcolor == NULL) {
palcolor = BKE_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 = BKE_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 */		/* Space Conversion */

/**		/**
* Init settings for stroke point space conversions		* Init settings for stroke point space conversions
*		*
* \param r_gsc: [out] The space conversion settings struct, populated with necessary params		* \param r_gsc: [out] The space conversion settings struct, populated with necessary params
*/		*/
▲ Show 20 Lines • Show All 44 Lines • ▼ Show 20 Lines
{		{
float fpt[3];		float fpt[3];

mul_v3_m4v3(fpt, diff_mat, &pt->x);		mul_v3_m4v3(fpt, diff_mat, &pt->x);
copy_v3_v3(&r_pt->x, fpt);		copy_v3_v3(&r_pt->x, fpt);
}		}

/**		/**
* Change points position relative to parent object		* Change position relative to parent object
*/		*/
void gp_apply_parent(bGPDlayer gpl, bGPDstroke gps)		void gp_apply_parent(Depsgraph depsgraph, Object obact, bGPdata gpd, bGPDlayer gpl, bGPDstroke *gps)
{		{
bGPDspoint *pt;		bGPDspoint *pt;
int i;		int i;

/* undo matrix */		/* undo matrix */
float diff_mat[4][4];		float diff_mat[4][4];
float inverse_diff_mat[4][4];		float inverse_diff_mat[4][4];
float fpt[3];		float fpt[3];

ED_gpencil_parent_location(gpl, diff_mat);		ED_gpencil_parent_location(depsgraph, obact, gpd, gpl, diff_mat);
invert_m4_m4(inverse_diff_mat, diff_mat);		invert_m4_m4(inverse_diff_mat, diff_mat);

for (i = 0; i < gps->totpoints; i++) {		for (i = 0; i < gps->totpoints; i++) {
pt = &gps->points[i];		pt = &gps->points[i];
mul_v3_m4v3(fpt, inverse_diff_mat, &pt->x);		mul_v3_m4v3(fpt, inverse_diff_mat, &pt->x);
copy_v3_v3(&pt->x, fpt);		copy_v3_v3(&pt->x, fpt);
}		}
}		}

/**		/**
* Change point position relative to parent object		* Change point position relative to parent object
*/		*/
void gp_apply_parent_point(bGPDlayer gpl, bGPDspoint pt)		void gp_apply_parent_point(Depsgraph depsgraph, Object obact, bGPdata gpd, bGPDlayer gpl, bGPDspoint *pt)
{		{
/* undo matrix */		/* undo matrix */
float diff_mat[4][4];		float diff_mat[4][4];
float inverse_diff_mat[4][4];		float inverse_diff_mat[4][4];
float fpt[3];		float fpt[3];

ED_gpencil_parent_location(gpl, diff_mat);		ED_gpencil_parent_location(depsgraph, obact, gpd, gpl, diff_mat);
invert_m4_m4(inverse_diff_mat, diff_mat);		invert_m4_m4(inverse_diff_mat, diff_mat);

mul_v3_m4v3(fpt, inverse_diff_mat, &pt->x);		mul_v3_m4v3(fpt, inverse_diff_mat, &pt->x);
copy_v3_v3(&pt->x, fpt);		copy_v3_v3(&pt->x, fpt);
}		}

/**		/**
* Convert a Grease Pencil coordinate (i.e. can be 2D or 3D) to screenspace (2D)		* Convert a Grease Pencil coordinate (i.e. can be 2D or 3D) to screenspace (2D)
▲ Show 20 Lines • Show All 148 Lines • ▼ Show 20 Lines	bool gp_point_xy_to_3d(GP_SpaceConversion gsc, Scene scene, const float screen_co[2], float r_out[3])
else {		else {
zero_v3(r_out);		zero_v3(r_out);

return false;		return false;
}		}
}		}

/**		/**
* Apply smooth to stroke point		* Convert tGPspoint (temporary 2D/screenspace point data used by GP modal operators)
* \param gps Stroke to smooth		* to 3D coordinates.
* \param i Point index		*
* \param inf Amount of smoothing to apply		* \param point2D: The screenspace 2D point data to convert
* \param affect_pressure Apply smoothing to pressure values too?		* \param depth: Depth array (via ED_view3d_autodist_depth())
		* \param[out] r_out: The resulting 2D point data
		*/
		void gp_stroke_convertcoords_tpoint(
		Scene scene, ARegion ar, View3D *v3d,
		Object ob, bGPDlayer gpl,
		const tGPspoint point2D, float depth,
		float r_out[3])
		{
		ToolSettings *ts = scene->toolsettings;
		const int mval[2] = {point2D->x, point2D->y};

		if ((depth != NULL) && (ED_view3d_autodist_simple(ar, mval, r_out, 0, depth))) {
		/* projecting onto 3D-Geometry
		* - nothing more needs to be done here, since view_autodist_simple() has already done it
*/		*/
bool gp_smooth_stroke(bGPDstroke *gps, int i, float inf, bool affect_pressure)
{
bGPDspoint *pt = &gps->points[i];
float pressure = 0.0f;
float sco[3] = {0.0f};

/* Do nothing if not enough points to smooth out */
if (gps->totpoints <= 2) {
return false;
}		}
		else {
		float mval_f[2] = {(float)point2D->x, (float)point2D->y};
		float mval_prj[2];
		float rvec[3], dvec[3];
		float zfac;

/* Only affect endpoints by a fraction of the normal strength,		/* Current method just converts each point in screen-coordinates to
* to prevent the stroke from shrinking too much		* 3D-coordinates using the 3D-cursor as reference.
*/		*/
if ((i == 0) \|\| (i == gps->totpoints - 1)) {		ED_gp_get_drawing_reference(v3d, scene, ob, gpl, ts->gpencil_v3d_align, rvec);
inf *= 0.1f;		zfac = ED_view3d_calc_zfac(ar->regiondata, rvec, NULL);

		if (ED_view3d_project_float_global(ar, rvec, mval_prj, V3D_PROJ_TEST_NOP) == V3D_PROJ_RET_OK) {
		sub_v2_v2v2(mval_f, mval_prj, mval_f);
		ED_view3d_win_to_delta(ar, mval_f, dvec, zfac);
		sub_v3_v3v3(r_out, rvec, dvec);
		}
		else {
		zero_v3(r_out);
		}
		}
}		}

/* Compute smoothed coordinate by taking the ones nearby */		/**
/* XXX: This is potentially slow, and suffers from accumulation error as earlier points are handled before later ones */		* Get drawing reference point for conversion or projection of the stroke
		* \param[out] r_vec : Reference point found
		*/
		void ED_gp_get_drawing_reference(View3D v3d, Scene scene, Object ob, bGPDlayer gpl, char align_flag, float r_vec[3])
{		{
// XXX: this is hardcoded to look at 2 points on either side of the current one (i.e. 5 items total)		const float *fp = ED_view3d_cursor3d_get(scene, v3d)->location;
const int steps = 2;
const float average_fac = 1.0f / (float)(steps * 2 + 1);
int step;

/* add the point itself */
madd_v3_v3fl(sco, &pt->x, average_fac);

if (affect_pressure) {		/* if using a gpencil object at cursor mode, can use the location of the object */
pressure += pt->pressure * average_fac;		if (align_flag & GP_PROJECT_VIEWSPACE) {
		if (ob && (ob->type == OB_GPENCIL)) {
		/* use last stroke position for layer */
		if (gpl && gpl->flag & GP_LAYER_USE_LOCATION) {
		if (gpl->actframe) {
		bGPDframe *gpf = gpl->actframe;
		if (gpf->strokes.last) {
		bGPDstroke *gps = gpf->strokes.last;
		if (gps->totpoints > 0) {
		copy_v3_v3(r_vec, &gps->points[gps->totpoints - 1].x);
		mul_m4_v3(ob->obmat, r_vec);
		return;
}		}

/* n-steps before/after current point */
// XXX: review how the endpoints are treated by this algorithm
// XXX: falloff measures should also introduce some weighting variations, so that further-out points get less weight
for (step = 1; step <= steps; step++) {
bGPDspoint pt1, pt2;
int before = i - step;
int after = i + step;

CLAMP_MIN(before, 0);
CLAMP_MAX(after, gps->totpoints - 1);

pt1 = &gps->points[before];
pt2 = &gps->points[after];

/* add both these points to the average-sum (s += p[i]/n) */
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
}		}
}		}
		/* fallback (no strokes) - use cursor or object location */
/* Based on influence factor, blend between original and optimal smoothed coordinate */		if (align_flag & GP_PROJECT_CURSOR) {
interp_v3_v3v3(&pt->x, &pt->x, sco, inf);		/* use 3D-cursor */
		copy_v3_v3(r_vec, fp);
#if 0
/* XXX: Disabled because get weird result */
if (affect_pressure) {
pt->pressure = pressure;
}		}
#endif		else {
		/* use object location */
return true;		copy_v3_v3(r_vec, ob->obmat[3]);
}		}
		}
		}
		else {
		/* use 3D-cursor */
		copy_v3_v3(r_vec, fp);
		}
		}


/**		/**
* Apply smooth for strength to stroke point		* Reproject all points of the stroke to a plane locked to axis to avoid stroke offset
* \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)		void ED_gp_project_stroke_to_plane(Object ob, RegionView3D rv3d, bGPDstroke *gps, const float origin[3], const int axis, char UNUSED(type))
{		{
bGPDspoint *ptb = &gps->points[i];		float plane_normal[3];
		float vn[3];

/* Do nothing if not enough points */		float ray[3];
if (gps->totpoints <= 2) {		float rpoint[3];
return false;
}

/* Compute theoretical optimal value using distances */
bGPDspoint pta, ptc;
int before = i - 1;
int after = i + 1;

CLAMP_MIN(before, 0);		/* normal vector for a plane locked to axis */
CLAMP_MAX(after, gps->totpoints - 1);		zero_v3(plane_normal);
		if (axis < 0) {
pta = &gps->points[before];		/* if the axis is not locked, need a vector to the view direction
ptc = &gps->points[after];		* in order to get the right size of the stroke.

/* 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);		ED_view3d_global_to_vector(rv3d, origin, plane_normal);
const float optimal = (1.0f - fac) * pta->strength + fac * ptc->strength;		}
		else {
		plane_normal[axis] = 1.0f;
		/* if object, apply object rotation */
		if (ob && (ob->type == OB_GPENCIL)) {
		mul_mat3_m4_v3(ob->obmat, plane_normal);
		}
		}

/* Based on influence factor, blend between original and optimal */		/* Reproject the points in the plane */
ptb->strength = (1.0f - inf) * ptb->strength + inf * optimal;		for (int i = 0; i < gps->totpoints; i++) {
		bGPDspoint *pt = &gps->points[i];

return true;		/* get a vector from the point with the current view direction of the viewport */
		ED_view3d_global_to_vector(rv3d, &pt->x, vn);

		/* calculate line extreme point to create a ray that cross the plane */
		mul_v3_fl(vn, -50.0f);
		add_v3_v3v3(ray, &pt->x, vn);

		/* if the line never intersect, the point is not changed */
		if (isect_line_plane_v3(rpoint, &pt->x, ray, origin, plane_normal)) {
		copy_v3_v3(&pt->x, rpoint);
		}
		}
}		}

/**		/**
* Apply smooth for thickness to stroke point (use pressure)		* Reproject given point to a plane locked to axis to avoid stroke offset
* \param gps Stroke to smooth		* \param[in, out] pt : Point to affect
* \param i Point index
* \param inf Amount of smoothing to apply
*/		*/
bool gp_smooth_stroke_thickness(bGPDstroke *gps, int i, float inf)		void ED_gp_project_point_to_plane(Object ob, RegionView3D rv3d, const float origin[3], const int axis, char UNUSED(type), bGPDspoint *pt)
{		{
bGPDspoint *ptb = &gps->points[i];		float plane_normal[3];
		float vn[3];
/* Do nothing if not enough points */
if (gps->totpoints <= 2) {
return false;
}

/* Compute theoretical optimal value using distances */		float ray[3];
bGPDspoint pta, ptc;		float rpoint[3];
int before = i - 1;
int after = i + 1;

CLAMP_MIN(before, 0);		/* normal vector for a plane locked to axis */
CLAMP_MAX(after, gps->totpoints - 1);		zero_v3(plane_normal);
		if (axis < 0) {
		/* if the axis is not locked, need a vector to the view direction
		* in order to get the right size of the stroke.
		*/
		ED_view3d_global_to_vector(rv3d, origin, plane_normal);
		}
		else {
		plane_normal[axis] = 1.0f;
		/* if object, apply object rotation */
		if (ob && (ob->type == OB_GPENCIL)) {
		mul_mat3_m4_v3(ob->obmat, plane_normal);
		}
		}

pta = &gps->points[before];
ptc = &gps->points[after];

/* the optimal value is the corresponding to the interpolation of the pressure		/* Reproject the points in the plane */
* at the distance of point b		/* get a vector from the point with the current view direction of the viewport */
*/		ED_view3d_global_to_vector(rv3d, &pt->x, vn);
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 */		/* calculate line extrem point to create a ray that cross the plane */
ptb->pressure = (1.0f - inf) * ptb->pressure + inf * optimal;		mul_v3_fl(vn, -50.0f);
		add_v3_v3v3(ray, &pt->x, vn);

return true;		/* if the line never intersect, the point is not changed */
		if (isect_line_plane_v3(rpoint, &pt->x, ray, origin, plane_normal)) {
		copy_v3_v3(&pt->x, rpoint);
}		}
		}

		/* ******************************************************** */
		/* Stroke Operations */
		// XXX: Check if these functions duplicate stuff in blenkernel, and/or whether we should just deduplicate

/**		/**
* Subdivide a stroke once, by adding a point half way between each pair of existing points		* Subdivide a stroke once, by adding a point half way between each pair of existing points
* \param gps Stroke data		* \param gps Stroke data
* \param new_totpoints Total number of points (after subdividing)		* \param subdivide Number of times to subdivide
*/		*/
void gp_subdivide_stroke(bGPDstroke *gps, const int new_totpoints)		void gp_subdivide_stroke(bGPDstroke *gps, const int subdivide)
{		{
/* Move points towards end of enlarged points array to leave space for new points */		bGPDspoint *temp_points;
int y = 1;		int totnewpoints, oldtotpoints;
for (int i = gps->totpoints - 1; i > 0; i--) {		int i2;
gps->points[new_totpoints - y] = gps->points[i];
y += 2;		/* loop as many times as levels */
}		for (int s = 0; s < subdivide; s++) {
		totnewpoints = gps->totpoints - 1;
/* Create interpolated points */		/* duplicate points in a temp area */
for (int i = 0; i < new_totpoints - 1; i += 2) {		temp_points = MEM_dupallocN(gps->points);
bGPDspoint *prev = &gps->points[i];		oldtotpoints = gps->totpoints;
bGPDspoint *pt = &gps->points[i + 1];
bGPDspoint *next = &gps->points[i + 2];		/* resize the points arrys */
		gps->totpoints += totnewpoints;
/* Interpolate all values */		gps->points = MEM_recallocN(gps->points, sizeof(gps->points) gps->totpoints);
interp_v3_v3v3(&pt->x, &prev->x, &next->x, 0.5f);		gps->dvert = MEM_recallocN(gps->dvert, sizeof(gps->dvert) gps->totpoints);
		gps->flag \|= GP_STROKE_RECALC_CACHES;

		/* move points from last to first to new place */
		i2 = gps->totpoints - 1;
		for (int i = oldtotpoints - 1; i > 0; i--) {
		bGPDspoint *pt = &temp_points[i];
		bGPDspoint *pt_final = &gps->points[i2];
		MDeformVert *dvert = &gps->dvert[i];
		MDeformVert *dvert_final = &gps->dvert[i2];

		copy_v3_v3(&pt_final->x, &pt->x);
		pt_final->pressure = pt->pressure;
		pt_final->strength = pt->strength;
		pt_final->time = pt->time;
		pt_final->flag = pt->flag;
		pt_final->uv_fac = pt->uv_fac;
		pt_final->uv_rot = pt->uv_rot;

		dvert_final->totweight = dvert->totweight;
		dvert_final->dw = dvert->dw;

		i2 -= 2;
		}
		/* interpolate mid points */
		i2 = 1;
		for (int i = 0; i < oldtotpoints - 1; i++) {
		bGPDspoint *pt = &temp_points[i];
		bGPDspoint *next = &temp_points[i + 1];
		bGPDspoint *pt_final = &gps->points[i2];
		MDeformVert *dvert_final = &gps->dvert[i2];

		/* add a half way point */
		interp_v3_v3v3(&pt_final->x, &pt->x, &next->x, 0.5f);
		pt_final->pressure = interpf(pt->pressure, next->pressure, 0.5f);
		pt_final->strength = interpf(pt->strength, next->strength, 0.5f);
		CLAMP(pt_final->strength, GPENCIL_STRENGTH_MIN, 1.0f);
		pt_final->time = interpf(pt->time, next->time, 0.5f);
		pt_final->uv_fac = interpf(pt->uv_fac, next->uv_fac, 0.5f);
		pt_final->uv_rot = interpf(pt->uv_rot, next->uv_rot, 0.5f);

		dvert_final->totweight = 0;
		dvert_final->dw = NULL;

		i2 += 2;
		}

		MEM_SAFE_FREE(temp_points);

		/* move points to smooth stroke */
		/* duplicate points in a temp area with the new subdivide data */
		temp_points = MEM_dupallocN(gps->points);

		/* extreme points are not changed */
		for (int i = 0; i < gps->totpoints - 2; i++) {
		bGPDspoint *pt = &temp_points[i];
		bGPDspoint *next = &temp_points[i + 1];
		bGPDspoint *pt_final = &gps->points[i + 1];

pt->pressure = interpf(prev->pressure, next->pressure, 0.5f);		/* move point */
pt->strength = interpf(prev->strength, next->strength, 0.5f);		interp_v3_v3v3(&pt_final->x, &pt->x, &next->x, 0.5f);
CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);		}
pt->time = interpf(prev->time, next->time, 0.5f);		/* free temp memory */
		MEM_SAFE_FREE(temp_points);
}		}

/* Update to new total number of points */
gps->totpoints = new_totpoints;
}		}

/**		/**
* Add randomness to stroke		* Add randomness to stroke
* \param gps Stroke data		* \param gps Stroke data
* \param brush Brush data		* \param brush Brush data
*/		*/
void gp_randomize_stroke(bGPDstroke gps, bGPDbrush brush)		void gp_randomize_stroke(bGPDstroke gps, Brush brush)
{		{
bGPDspoint pt1, pt2, *pt3;		bGPDspoint pt1, pt2, *pt3;
float v1[3];		float v1[3];
float v2[3];		float v2[3];
if (gps->totpoints < 3) {		if (gps->totpoints < 3) {
return;		return;
}		}

Show All 13 Lines	void gp_randomize_stroke(bGPDstroke gps, Brush brush)
normalize_v3(normal);		normalize_v3(normal);

/* get orthogonal vector to plane to rotate random effect */		/* get orthogonal vector to plane to rotate random effect */
float ortho[3];		float ortho[3];
cross_v3_v3v3(ortho, v1, normal);		cross_v3_v3v3(ortho, v1, normal);
normalize_v3(ortho);		normalize_v3(ortho);

/* Read all points and apply shift vector (first and last point not modified) */		/* Read all points and apply shift vector (first and last point not modified) */
for (int i = 1; i < gps->totpoints - 1; ++i) {		for (int i = 1; i < gps->totpoints - 1; i++) {
bGPDspoint *pt = &gps->points[i];		bGPDspoint *pt = &gps->points[i];
/* get vector with shift (apply a division because random is too sensitive */		/* get vector with shift (apply a division because random is too sensitive */
const float fac = BLI_frand() * (brush->draw_random_sub / 10.0f);		const float fac = BLI_frand() * (brush->gpencil_settings->draw_random_sub / 10.0f);
float svec[3];		float svec[3];
copy_v3_v3(svec, ortho);		copy_v3_v3(svec, ortho);
if (BLI_frand() > 0.5f) {		if (BLI_frand() > 0.5f) {
mul_v3_fl(svec, -fac);		mul_v3_fl(svec, -fac);
}		}
else {		else {
mul_v3_fl(svec, fac);		mul_v3_fl(svec, fac);
}		}

/* apply shift */		/* apply shift */
add_v3_v3(&pt->x, svec);		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) {		/* ******************************************************** */
		/* Layer Parenting - Compute Parent Transforms */

		/* calculate difference matrix */
		void ED_gpencil_parent_location(
		const Depsgraph depsgraph, Object obact, bGPdata *UNUSED(gpd),
		bGPDlayer *gpl, float diff_mat[4][4])
		{
		Object *ob_eval = depsgraph != NULL ? DEG_get_evaluated_object(depsgraph, obact) : obact;
		Object *obparent = gpl->parent;
		Object *obparent_eval = depsgraph != NULL ? DEG_get_evaluated_object(depsgraph, obparent) : obparent;

		/* if not layer parented, try with object parented */
		if (obparent_eval == NULL) {
		if (ob_eval != NULL) {
		if (ob_eval->type == OB_GPENCIL) {
		copy_m4_m4(diff_mat, ob_eval->obmat);
		return;
		}
		}
		/* not gpencil object */
unit_m4(diff_mat);		unit_m4(diff_mat);
return;		return;
}		}
else {		else {
if ((gpl->partype == PAROBJECT) \|\| (gpl->partype == PARSKEL)) {		if ((gpl->partype == PAROBJECT) \|\| (gpl->partype == PARSKEL)) {
mul_m4_m4m4(diff_mat, ob->obmat, gpl->inverse);		mul_m4_m4m4(diff_mat, obparent_eval->obmat, gpl->inverse);
return;		return;
}		}
else if (gpl->partype == PARBONE) {		else if (gpl->partype == PARBONE) {
bPoseChannel *pchan = BKE_pose_channel_find_name(ob->pose, gpl->parsubstr);		bPoseChannel *pchan = BKE_pose_channel_find_name(obparent_eval->pose, gpl->parsubstr);
if (pchan) {		if (pchan) {
float tmp_mat[4][4];		float tmp_mat[4][4];
mul_m4_m4m4(tmp_mat, ob->obmat, pchan->pose_mat);		mul_m4_m4m4(tmp_mat, obparent_eval->obmat, pchan->pose_mat);
mul_m4_m4m4(diff_mat, tmp_mat, gpl->inverse);		mul_m4_m4m4(diff_mat, tmp_mat, gpl->inverse);
}		}
else {		else {
mul_m4_m4m4(diff_mat, ob->obmat, gpl->inverse); /* if bone not found use object (armature) */		mul_m4_m4m4(diff_mat, obparent_eval->obmat, gpl->inverse); /* if bone not found use object (armature) */
}		}
return;		return;
}		}
else {		else {
unit_m4(diff_mat); /* not defined type */		unit_m4(diff_mat); /* not defined type */
}		}
}		}
}		}

/* reset parent matrix for all layers */		/* reset parent matrix for all layers */
void ED_gpencil_reset_layers_parent(bGPdata *gpd)		void ED_gpencil_reset_layers_parent(Depsgraph depsgraph, Object obact, bGPdata *gpd)
{		{
bGPDspoint *pt;		bGPDspoint *pt;
int i;		int i;
float diff_mat[4][4];		float diff_mat[4][4];
float cur_mat[4][4];		float cur_mat[4][4];

for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {		for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
if (gpl->parent != NULL) {		if (gpl->parent != NULL) {
/* calculate new matrix */		/* calculate new matrix */
if ((gpl->partype == PAROBJECT) \|\| (gpl->partype == PARSKEL)) {		if ((gpl->partype == PAROBJECT) \|\| (gpl->partype == PARSKEL)) {
invert_m4_m4(cur_mat, gpl->parent->obmat);		invert_m4_m4(cur_mat, gpl->parent->obmat);
}		}
else if (gpl->partype == PARBONE) {		else if (gpl->partype == PARBONE) {
bPoseChannel *pchan = BKE_pose_channel_find_name(gpl->parent->pose, gpl->parsubstr);		bPoseChannel *pchan = BKE_pose_channel_find_name(gpl->parent->pose, gpl->parsubstr);
if (pchan) {		if (pchan) {
float tmp_mat[4][4];		float tmp_mat[4][4];
mul_m4_m4m4(tmp_mat, gpl->parent->obmat, pchan->pose_mat);		mul_m4_m4m4(tmp_mat, gpl->parent->obmat, pchan->pose_mat);
invert_m4_m4(cur_mat, tmp_mat);		invert_m4_m4(cur_mat, tmp_mat);
}		}
}		}

/* only redo if any change */		/* only redo if any change */
if (!equals_m4m4(gpl->inverse, cur_mat)) {		if (!equals_m4m4(gpl->inverse, cur_mat)) {
/* first apply current transformation to all strokes */		/* first apply current transformation to all strokes */
ED_gpencil_parent_location(gpl, diff_mat);		ED_gpencil_parent_location(depsgraph, obact, gpd, gpl, diff_mat);
for (bGPDframe *gpf = gpl->frames.first; gpf; gpf = gpf->next) {		for (bGPDframe *gpf = gpl->frames.first; gpf; gpf = gpf->next) {
for (bGPDstroke *gps = gpf->strokes.first; gps; gps = gps->next) {		for (bGPDstroke *gps = gpf->strokes.first; gps; gps = gps->next) {
for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {		for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
mul_m4_v3(diff_mat, &pt->x);		mul_m4_v3(diff_mat, &pt->x);
}		}
}		}
}		}
/* set new parent matrix */		/* set new parent matrix */
copy_m4_m4(gpl->inverse, cur_mat);		copy_m4_m4(gpl->inverse, cur_mat);
}		}
}		}
}		}
}		}
/* ******************************************************** */		/* ******************************************************** */
bool ED_gpencil_stroke_minmax(		/* GP Object Stuff */
const bGPDstroke *gps, const bool use_select,
float r_min[3], float r_max[3])		/* Helper function to create new OB_GPENCIL Object */
		Object ED_add_gpencil_object(bContext C, Scene *scene, const float loc[3])
{		{
const bGPDspoint *pt;		float rot[3] = {0.0f};
int i;
bool changed = false;

for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {		Object *ob = ED_object_add_type(C, OB_GPENCIL, NULL, loc, rot, false, scene->lay);
if ((use_select == false) \|\| (pt->flag & GP_SPOINT_SELECT)) {;
minmax_v3v3_v3(r_min, r_max, &pt->x);		/* define size */
changed = true;		BKE_object_obdata_size_init(ob, GP_OBGPENCIL_DEFAULT_SIZE);
		/* create default brushes and colors */
		ED_gpencil_add_defaults(C);

		return ob;
		}

		/* Helper function to create default colors and drawing brushes */
		void ED_gpencil_add_defaults(bContext *C)
		{
		Main *bmain = CTX_data_main(C);
		Object *ob = CTX_data_active_object(C);
		ToolSettings *ts = CTX_data_tool_settings(C);

		/* first try to reuse default material */
		if (ob->actcol > 0) {
		Material *ma = give_current_material(ob, ob->actcol);
		if ((ma) && (ma->gp_style == NULL)) {
		BKE_material_init_gpencil_settings(ma);
}		}
}		}
return changed;
		/* ensure color exist */
		BKE_gpencil_material_ensure(bmain, ob);

		Paint *paint = BKE_brush_get_gpencil_paint(ts);
		/* if not exist, create a new one */
		if (paint->brush == NULL) {
		/* create new brushes */
		BKE_brush_gpencil_presets(C);
}		}

/* Dynamic Enums of GP Brushes */		}
const EnumPropertyItem *ED_gpencil_brushes_enum_itemf(
bContext C, PointerRNA UNUSED(ptr), PropertyRNA *UNUSED(prop),		/* ******************************************************** */
bool *r_free)		/* Vertex Groups */

		/* assign points to vertex group */
		void ED_gpencil_vgroup_assign(bContext C, Object ob, float weight)
{		{
ToolSettings *ts = CTX_data_tool_settings(C);		const int def_nr = ob->actdef - 1;
bGPDbrush *brush;		if (!BLI_findlink(&ob->defbase, def_nr))
EnumPropertyItem *item = NULL, item_tmp = { 0 };		return;
int totitem = 0;
int i = 0;

if (ELEM(NULL, C, ts)) {		CTX_DATA_BEGIN(C, bGPDstroke *, gps, editable_gpencil_strokes)
return DummyRNA_DEFAULT_items;		{
		if (gps->flag & GP_STROKE_SELECT) {
		for (int i = 0; i < gps->totpoints; i++) {
		bGPDspoint *pt = &gps->points[i];
		MDeformVert *dvert = &gps->dvert[i];
		if (pt->flag & GP_SPOINT_SELECT) {
		BKE_gpencil_vgroup_add_point_weight(dvert, def_nr, weight);
		}
		}
		}
		}
		CTX_DATA_END;
}		}

/* Existing brushes */		/* remove points from vertex group */
for (brush = ts->gp_brushes.first; brush; brush = brush->next, i++) {		void ED_gpencil_vgroup_remove(bContext C, Object ob)
item_tmp.identifier = brush->info;		{
item_tmp.name = brush->info;		const int def_nr = ob->actdef - 1;
item_tmp.value = i;		if (!BLI_findlink(&ob->defbase, def_nr))
		return;

if (brush->flag & GP_BRUSH_ACTIVE)		CTX_DATA_BEGIN(C, bGPDstroke *, gps, editable_gpencil_strokes)
item_tmp.icon = ICON_BRUSH_DATA;		{
else		for (int i = 0; i < gps->totpoints; i++) {
item_tmp.icon = ICON_NONE;		bGPDspoint *pt = &gps->points[i];
		MDeformVert *dvert = &gps->dvert[i];

RNA_enum_item_add(&item, &totitem, &item_tmp);		if ((pt->flag & GP_SPOINT_SELECT) && (dvert->totweight > 0)) {
		BKE_gpencil_vgroup_remove_point_weight(dvert, def_nr);
		}
		}
		}
		CTX_DATA_END;
}		}

RNA_enum_item_end(&item, &totitem);		/* select points of vertex group */
*r_free = true;		void ED_gpencil_vgroup_select(bContext C, Object ob)
		{
		const int def_nr = ob->actdef - 1;
		if (!BLI_findlink(&ob->defbase, def_nr))
		return;

return item;		CTX_DATA_BEGIN(C, bGPDstroke *, gps, editable_gpencil_strokes)
		{
		for (int i = 0; i < gps->totpoints; i++) {
		bGPDspoint *pt = &gps->points[i];
		MDeformVert *dvert = &gps->dvert[i];

		if (BKE_gpencil_vgroup_use_index(dvert, def_nr) > -1.0f) {
		pt->flag \|= GP_SPOINT_SELECT;
		gps->flag \|= GP_STROKE_SELECT;
		}
		}
		}
		CTX_DATA_END;
}		}

/* Dynamic Enums of GP Palettes */		/* unselect points of vertex group */
const EnumPropertyItem *ED_gpencil_palettes_enum_itemf(		void ED_gpencil_vgroup_deselect(bContext C, Object ob)
bContext C, PointerRNA UNUSED(ptr), PropertyRNA *UNUSED(prop),
bool *r_free)
{		{
bGPdata *gpd = CTX_data_gpencil_data(C);		const int def_nr = ob->actdef - 1;
bGPDpalette *palette;		if (!BLI_findlink(&ob->defbase, def_nr))
EnumPropertyItem *item = NULL, item_tmp = { 0 };		return;
int totitem = 0;
int i = 0;

if (ELEM(NULL, C, gpd)) {		CTX_DATA_BEGIN(C, bGPDstroke *, gps, editable_gpencil_strokes)
return DummyRNA_DEFAULT_items;		{
		for (int i = 0; i < gps->totpoints; i++) {
		bGPDspoint *pt = &gps->points[i];
		MDeformVert *dvert = &gps->dvert[i];

		if (BKE_gpencil_vgroup_use_index(dvert, def_nr) > -1.0f) {
		pt->flag &= ~GP_SPOINT_SELECT;
		gps->flag \|= GP_STROKE_SELECT;
		}
		}
		}
		CTX_DATA_END;
}		}

/* Existing palettes */		/* ******************************************************** */
for (palette = gpd->palettes.first; palette; palette = palette->next, i++) {		/* Cursor drawing */
item_tmp.identifier = palette->info;
item_tmp.name = palette->info;
item_tmp.value = i;

if (palette->flag & PL_PALETTE_ACTIVE)		/* check if cursor is in drawing region */
item_tmp.icon = ICON_COLOR;		static bool gp_check_cursor_region(bContext *C, int mval[2])
else		{
item_tmp.icon = ICON_NONE;		ARegion *ar = CTX_wm_region(C);
		ScrArea *sa = CTX_wm_area(C);
		/* TODO: add more spacetypes */
		if (!ELEM(sa->spacetype, SPACE_VIEW3D)) {
		return false;
		}
		if ((ar) && (ar->regiontype != RGN_TYPE_WINDOW)) {
		return false;
		}
		else if (ar) {
		rcti region_rect;

RNA_enum_item_add(&item, &totitem, &item_tmp);		/* Perform bounds check using */
		ED_region_visible_rect(ar, &region_rect);
		return BLI_rcti_isect_pt_v(&region_rect, mval);
		}
		else {
		return false;
		}
}		}

RNA_enum_item_end(&item, &totitem);		/* draw eraser cursor */
*r_free = true;		void ED_gpencil_brush_draw_eraser(Brush *brush, int x, int y)
		{
		short radius = (short)brush->size;

return item;		Gwn_VertFormat *format = immVertexFormat();
		const uint shdr_pos = GWN_vertformat_attr_add(format, "pos", GWN_COMP_F32, 2, GWN_FETCH_FLOAT);
		immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

		glEnable(GL_LINE_SMOOTH);
		glEnable(GL_BLEND);
		glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);

		immUniformColor4ub(255, 100, 100, 20);
		imm_draw_circle_fill_2d(shdr_pos, x, y, radius, 40);

		immUnbindProgram();

		immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);

		float viewport_size[4];
		glGetFloatv(GL_VIEWPORT, viewport_size);
		immUniform2f("viewport_size", viewport_size[2], viewport_size[3]);

		immUniformColor4f(1.0f, 0.39f, 0.39f, 0.78f);
		immUniform1i("num_colors", 0); /* "simple" mode */
		immUniform1f("dash_width", 12.0f);
		immUniform1f("dash_factor", 0.5f);

		imm_draw_circle_wire_2d(shdr_pos, x, y, radius,
		/* XXX Dashed shader gives bad results with sets of small segments currently,
		* temp hack around the issue. :( */
		max_ii(8, radius / 2)); /* was fixed 40 */

		immUnbindProgram();

		glDisable(GL_BLEND);
		glDisable(GL_LINE_SMOOTH);
		}

		/* Helper callback for drawing the cursor itself */
		static void gp_brush_drawcursor(bContext C, int x, int y, void customdata)
		{
		Main *bmain = CTX_data_main(C);
		Scene *scene = CTX_data_scene(C);
		Object *ob = CTX_data_active_object(C);
		ARegion *ar = CTX_wm_region(C);

		GP_BrushEdit_Settings *gset = &scene->toolsettings->gp_sculpt;
		bGPdata *gpd = ED_gpencil_data_get_active(C);
		GP_EditBrush_Data *brush = NULL;
		Brush *paintbrush = NULL;
		Material *ma = NULL;
		MaterialGPencilStyle *gp_style = NULL;
		int *last_mouse_position = customdata;

		if ((gpd) && (gpd->flag & GP_DATA_STROKE_WEIGHTMODE)) {
		brush = &gset->brush[gset->weighttype];
		}
		else {
		brush = &gset->brush[gset->brushtype];
		}

		/* default radius and color */
		float color[3] = {1.0f, 1.0f, 1.0f};
		float darkcolor[3];
		float radius = 3.0f;

		int mval[2] = {x, y};
		/* check if cursor is in drawing region and has valid datablock */
		if ((!gp_check_cursor_region(C, mval)) \|\| (gpd == NULL)) {
		return;
		}

		/* for paint use paint brush size and color */
		if (gpd->flag & GP_DATA_STROKE_PAINTMODE) {
		paintbrush = BKE_brush_getactive_gpencil(scene->toolsettings);
		/* while drawing hide */
		if ((gpd->sbuffer_size > 0) &&
		(paintbrush) && ((paintbrush->gpencil_settings->flag & GP_BRUSH_STABILIZE_MOUSE) == 0) &&
		((paintbrush->gpencil_settings->flag & GP_BRUSH_STABILIZE_MOUSE_TEMP) == 0))
		{
		return;
		}

		if (paintbrush) {
		if ((paintbrush->gpencil_settings->flag & GP_BRUSH_ENABLE_CURSOR) == 0) {
		return;
		}

		/* eraser has special shape and use a different shader program */
		if (paintbrush->gpencil_settings->brush_type == GP_BRUSH_TYPE_ERASE) {
		ED_gpencil_brush_draw_eraser(paintbrush, x, y);
		return;
		}

		/* get current drawing color */
		ma = BKE_gpencil_get_material_from_brush(paintbrush);
		if (ma == NULL) {
		BKE_gpencil_material_ensure(bmain, ob);
		/* assign the first material to the brush */
		ma = give_current_material(ob, 1);
		paintbrush->gpencil_settings->material = ma;
		}
		gp_style = ma->gp_style;

		/* after some testing, display the size of the brush is not practical because
		* is too disruptive and the size of cursor does not change with zoom factor.
		* The decision was to use a fix size, instead of paintbrush->thickness value.
		*/
		if ((gp_style) && (GPENCIL_PAINT_MODE(gpd)) &&
		((paintbrush->gpencil_settings->flag & GP_BRUSH_STABILIZE_MOUSE) == 0) &&
		((paintbrush->gpencil_settings->flag & GP_BRUSH_STABILIZE_MOUSE_TEMP) == 0) &&
		(paintbrush->gpencil_settings->brush_type == GP_BRUSH_TYPE_DRAW))
		{
		radius = 2.0f;
		copy_v3_v3(color, gp_style->stroke_rgba);
		}
		else {
		radius = 5.0f;
		copy_v3_v3(color, paintbrush->add_col);
		}
		}
		else {
		return;
		}
		}

		/* for sculpt use sculpt brush size */
		if (GPENCIL_SCULPT_OR_WEIGHT_MODE(gpd)) {
		if (brush) {
		if ((brush->flag & GP_EDITBRUSH_FLAG_ENABLE_CURSOR) == 0) {
		return;
		}

		radius = brush->size;
		if (brush->flag & (GP_EDITBRUSH_FLAG_INVERT \| GP_EDITBRUSH_FLAG_TMP_INVERT)) {
		copy_v3_v3(color, brush->curcolor_sub);
		}
		else {
		copy_v3_v3(color, brush->curcolor_add);
		}
		}
		}

		/* draw icon */
		Gwn_VertFormat *format = immVertexFormat();
		unsigned int pos = GWN_vertformat_attr_add(format, "pos", GWN_COMP_F32, 2, GWN_FETCH_FLOAT);
		immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

		glEnable(GL_LINE_SMOOTH);
		glEnable(GL_BLEND);

		/* Inner Ring: Color from UI panel */
		immUniformColor4f(color[0], color[1], color[2], 0.8f);
		if ((gp_style) && (GPENCIL_PAINT_MODE(gpd)) &&
		((paintbrush->gpencil_settings->flag & GP_BRUSH_STABILIZE_MOUSE) == 0) &&
		((paintbrush->gpencil_settings->flag & GP_BRUSH_STABILIZE_MOUSE_TEMP) == 0) &&
		(paintbrush->gpencil_settings->brush_type == GP_BRUSH_TYPE_DRAW))
		{
		imm_draw_circle_fill_2d(pos, x, y, radius, 40);
		}
		else {
		imm_draw_circle_wire_2d(pos, x, y, radius, 40);
		}

		/* Outer Ring: Dark color for contrast on light backgrounds (e.g. gray on white) */
		mul_v3_v3fl(darkcolor, color, 0.40f);
		immUniformColor4f(darkcolor[0], darkcolor[1], darkcolor[2], 0.8f);
		imm_draw_circle_wire_2d(pos, x, y, radius + 1, 40);

		glDisable(GL_BLEND);
		glDisable(GL_LINE_SMOOTH);

		/* Draw line for lazy mouse */
		if (last_mouse_position) {
		glEnable(GL_LINE_SMOOTH);
		glEnable(GL_BLEND);

		copy_v3_v3(color, paintbrush->add_col);
		immUniformColor4f(color[0], color[1], color[2], 0.8f);

		immBegin(GWN_PRIM_LINES, 2);
		immVertex2f(pos, x, y);
		immVertex2f(pos, last_mouse_position[0] + ar->winrct.xmin,
		last_mouse_position[1] + ar->winrct.ymin);
		immEnd();

		glDisable(GL_BLEND);
		glDisable(GL_LINE_SMOOTH);
		}

		immUnbindProgram();
		}

		/* Turn brush cursor in on/off */
		void ED_gpencil_toggle_brush_cursor(bContext C, bool enable, void customdata)
		{
		Scene *scene = CTX_data_scene(C);
		GP_BrushEdit_Settings *gset = &scene->toolsettings->gp_sculpt;
		int *lastpost = customdata;

		if (gset->paintcursor && !enable) {
		/* clear cursor */
		WM_paint_cursor_end(CTX_wm_manager(C), gset->paintcursor);
		gset->paintcursor = NULL;
		}
		else if (enable) {
		/* in some situations cursor could be duplicated, so it is better disable first if exist */
		if (gset->paintcursor) {
		/* clear cursor */
		WM_paint_cursor_end(CTX_wm_manager(C), gset->paintcursor);
		gset->paintcursor = NULL;
		}
		/* enable cursor */
		gset->paintcursor = WM_paint_cursor_activate(CTX_wm_manager(C),
		NULL,
		gp_brush_drawcursor,
		(lastpost) ? customdata : NULL);
		}
		}

		/* verify if is using the right brush */
		static void gpencil_verify_brush_type(bContext *C, int newmode)
		{
		ToolSettings *ts = CTX_data_tool_settings(C);
		GP_BrushEdit_Settings *gset = &ts->gp_sculpt;

		switch (newmode) {
		case OB_MODE_GPENCIL_SCULPT:
		gset->flag &= ~GP_BRUSHEDIT_FLAG_WEIGHT_MODE;
		if ((gset->brushtype < 0) \|\| (gset->brushtype >= GP_EDITBRUSH_TYPE_WEIGHT)) {
		gset->brushtype = GP_EDITBRUSH_TYPE_PUSH;
		}
		break;
		case OB_MODE_GPENCIL_WEIGHT:
		gset->flag \|= GP_BRUSHEDIT_FLAG_WEIGHT_MODE;
		if ((gset->weighttype < GP_EDITBRUSH_TYPE_WEIGHT) \|\| (gset->weighttype >= TOT_GP_EDITBRUSH_TYPES)) {
		gset->weighttype = GP_EDITBRUSH_TYPE_WEIGHT;
		}
		break;
		default:
		break;
		}
		}

		/* set object modes */
		void ED_gpencil_setup_modes(bContext C, bGPdata gpd, int newmode)
		{
		if (!gpd) {
		return;
		}

		switch (newmode) {
		case OB_MODE_GPENCIL_EDIT:
		gpd->flag \|= GP_DATA_STROKE_EDITMODE;
		gpd->flag &= ~GP_DATA_STROKE_PAINTMODE;
		gpd->flag &= ~GP_DATA_STROKE_SCULPTMODE;
		gpd->flag &= ~GP_DATA_STROKE_WEIGHTMODE;
		ED_gpencil_toggle_brush_cursor(C, false, NULL);
		break;
		case OB_MODE_GPENCIL_PAINT:
		gpd->flag &= ~GP_DATA_STROKE_EDITMODE;
		gpd->flag \|= GP_DATA_STROKE_PAINTMODE;
		gpd->flag &= ~GP_DATA_STROKE_SCULPTMODE;
		gpd->flag &= ~GP_DATA_STROKE_WEIGHTMODE;
		ED_gpencil_toggle_brush_cursor(C, true, NULL);
		break;
		case OB_MODE_GPENCIL_SCULPT:
		gpd->flag &= ~GP_DATA_STROKE_EDITMODE;
		gpd->flag &= ~GP_DATA_STROKE_PAINTMODE;
		gpd->flag \|= GP_DATA_STROKE_SCULPTMODE;
		gpd->flag &= ~GP_DATA_STROKE_WEIGHTMODE;
		gpencil_verify_brush_type(C, OB_MODE_GPENCIL_SCULPT);
		ED_gpencil_toggle_brush_cursor(C, true, NULL);
		break;
		case OB_MODE_GPENCIL_WEIGHT:
		gpd->flag &= ~GP_DATA_STROKE_EDITMODE;
		gpd->flag &= ~GP_DATA_STROKE_PAINTMODE;
		gpd->flag &= ~GP_DATA_STROKE_SCULPTMODE;
		gpd->flag \|= GP_DATA_STROKE_WEIGHTMODE;
		gpencil_verify_brush_type(C, OB_MODE_GPENCIL_WEIGHT);
		ED_gpencil_toggle_brush_cursor(C, true, NULL);
		break;
		default:
		gpd->flag &= ~GP_DATA_STROKE_EDITMODE;
		gpd->flag &= ~GP_DATA_STROKE_PAINTMODE;
		gpd->flag &= ~GP_DATA_STROKE_SCULPTMODE;
		gpd->flag &= ~GP_DATA_STROKE_WEIGHTMODE;
		ED_gpencil_toggle_brush_cursor(C, false, NULL);
		break;
		}
		}

		/* helper to convert 2d to 3d for simple drawing buffer */
		static void gpencil_stroke_convertcoords(ARegion ar, const tGPspoint point2D, float origin[3], float out[3])
		{
		float mval_f[2] = { (float)point2D->x, (float)point2D->y };
		float mval_prj[2];
		float rvec[3], dvec[3];
		float zfac;

		copy_v3_v3(rvec, origin);

		zfac = ED_view3d_calc_zfac(ar->regiondata, rvec, NULL);

		if (ED_view3d_project_float_global(ar, rvec, mval_prj, V3D_PROJ_TEST_NOP) == V3D_PROJ_RET_OK) {
		sub_v2_v2v2(mval_f, mval_prj, mval_f);
		ED_view3d_win_to_delta(ar, mval_f, dvec, zfac);
		sub_v3_v3v3(out, rvec, dvec);
		}
		else {
		zero_v3(out);
		}
		}

		/* convert 2d tGPspoint to 3d bGPDspoint */
		void ED_gpencil_tpoint_to_point(ARegion ar, float origin[3], const tGPspoint tpt, bGPDspoint *pt)
		{
		float p3d[3];
		/* conversion to 3d format */
		gpencil_stroke_convertcoords(ar, tpt, origin, p3d);
		copy_v3_v3(&pt->x, p3d);

		pt->pressure = tpt->pressure;
		pt->strength = tpt->strength;
		pt->uv_fac = tpt->uv_fac;
		pt->uv_rot = tpt->uv_rot;
		}

		/* texture coordinate utilities */
		void ED_gpencil_calc_stroke_uv(Object ob, bGPDstroke gps)
		{
		if (gps == NULL) {
		return;
		}
		MaterialGPencilStyle *gp_style = BKE_material_gpencil_settings_get(ob, gps->mat_nr + 1);
		float pixsize;
		if (gp_style) {
		pixsize = gp_style->texture_pixsize / 1000000.0f;
		}
		else {
		/* use this value by default */
		pixsize = 0.000100f;
		}
		pixsize = MAX2(pixsize, 0.0000001f);

		bGPDspoint *pt = NULL;
		bGPDspoint *ptb = NULL;
		int i;
		float totlen = 0;

		/* first read all points and calc distance */
		for (i = 0; i < gps->totpoints; i++) {
		pt = &gps->points[i];
		/* first point */
		if (i == 0) {
		pt->uv_fac = 0.0f;
		continue;
		}

		ptb = &gps->points[i - 1];
		totlen += len_v3v3(&pt->x, &ptb->x) / pixsize;
		pt->uv_fac = totlen;
		}
		/* normalize the distance using a factor */
		float factor;
		/* if image, use texture width */
		if ((gp_style) && (gp_style->sima)) {
		factor = gp_style->sima->gen_x;
		}
		else {
		factor = totlen;
		}
		for (i = 0; i < gps->totpoints; i++) {
		pt = &gps->points[i];
		pt->uv_fac /= factor;
		}
		}

		/* recalc uv for any stroke using the material */
		void ED_gpencil_update_color_uv(Main bmain, Material mat)
		{
		Material *gps_ma = NULL;
		/* read all strokes */
		for (Object *ob = bmain->object.first; ob; ob = ob->id.next) {
		if (ob->type == OB_GPENCIL) {
		bGPdata *gpd = ob->data;
		if (gpd == NULL) {
		continue;
		}

		for (bGPDlayer *gpl = gpd->layers.first; gpl; gpl = gpl->next) {
		/* only editable and visible layers are considered */
		if (gpencil_layer_is_editable(gpl)) {
		for (bGPDframe *gpf = gpl->frames.first; gpf; gpf = gpf->next) {
		for (bGPDstroke *gps = gpf->strokes.first; gps; gps = gps->next) {
		/* check if it is editable */
		if (ED_gpencil_stroke_color_use(ob, gpl, gps) == false) {
		continue;
		}
		gps_ma = give_current_material(ob, gps->mat_nr + 1);
		/* update */
		if ((gps_ma) && (gps_ma == mat)) {
		ED_gpencil_calc_stroke_uv(ob, gps);
		}
		}
		}
		}
		}
		}
		}
}		}
/* ******************************************************** */		/* ******************************************************** */