Bugfix T43293: Crash when editing shared GPencil datablock in VSE

The problem here was that when a Grease Pencil datablock is shared between
the 3D view and another one of the editors, all the strokes were getting handled
by the editing operators, even if those strokes could not be displayed/used
in that context. As a result, the coordinate conversion methods would fail,
as some of the needed data would not be set.

The fix here involves not including any offending strokes in such cases...

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/editors/include/ED_gpencil.h b/source/blender/editors/include/ED_gpencil.h
index b0d1be1bf5d..c4f08ca4775 100644
--- a/source/blender/editors/include/ED_gpencil.h
+++ b/source/blender/editors/include/ED_gpencil.h
@@ -43,6 +43,7 @@ struct Object;
 struct bGPdata;
 struct bGPDlayer;
 struct bGPDframe;
+struct bGPDstroke;
 struct PointerRNA;
 struct ImBuf;
 struct wmKeyConfig;
@@ -80,6 +81,11 @@ struct bGPdata *ED_gpencil_data_get_active_direct(struct ID *screen_id, struct S
 /* 3D View */
 struct bGPdata  *ED_gpencil_data_get_active_v3d(struct Scene *scene, struct View3D *v3d);
 
+/* ----------- Stroke Editing Utilities ---------------- */
+
+bool ED_gpencil_stroke_can_use_direct(const struct ScrArea *sa, const struct bGPDstroke *gps);
+bool ED_gpencil_stroke_can_use(const struct bContext *C, const struct bGPDstroke *gps);
+
 /* ----------- Grease Pencil Operators ----------------- */
 
 void ED_keymap_gpencil(struct wmKeyConfig *keyconf);