Grease Pencil: Basic Support for Image Editor Again

* Grease Pencil works again from Image Editor now. For now, the GPencil datablock is linked to the Image Editor space, but this can be changed if need be.

* Made Grease Pencil hotkeys into a separate Grease Pencil keymap, which can get included automagically like for frames/ui/v2d/etc. by supplying ED_KEYMAP_GPENCIL as part of st->keymapflag

* Temporarily restored the nasty hack to make View2D-aligned sketches in Image Editor to use OpenGL lines only. I still dunno why this doesn't work normally. 
(Probably related is that strokes are not visible when there's no image visible atm).

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/editors/gpencil/gpencil_edit.c b/source/blender/editors/gpencil/gpencil_edit.c
index b2228134750..74fbe250d37 100644
--- a/source/blender/editors/gpencil/gpencil_edit.c
+++ b/source/blender/editors/gpencil/gpencil_edit.c
@@ -125,6 +125,17 @@ bGPdata **gpencil_data_get_pointers (bContext *C, PointerRNA *ptr)
 			}
 				break;
 				
+			case SPACE_IMAGE: /* Image/UV Editor */
+			{
+				SpaceImage *sima= (SpaceImage *)CTX_wm_space_data(C);
+				
+				/* for now, Grease Pencil data is associated with the space... */
+				// XXX our convention for everything else is to link to data though...
+				if (ptr) RNA_pointer_create((ID *)CTX_wm_screen(C), &RNA_SpaceImageEditor, sima, ptr);
+				return &sima->gpd;
+			}
+				break;
+				
 			default: /* unsupported space */
 				return NULL;
 		}