Grease Pencil - Support for Grease Pencil in the Sequence Editor preview/image

space works again

This commit restores the support for using Grease Pencil in the Sequence Editor
image preview region, making it possible to scribble on footage for review
purposes again. Due to internal changes in how the Sequencer handles the image
drawing for this stuff (i.e. it is now fully based on View2D instead of trying
to implement its own little crazy offset+zoom stuff), a lot of the old code for
handling those offsets is no longer needed. Instead, one of the "standard" cases
is now used, and works quite well.

Bugfixes:
* View-space Grease Pencil drawing was done in wrong place (before view2d
restore)
* Grease Pencil entry in RNA had wrong/missing type

Credits:
* DingTo - initial patch/attempt at restoring support
* Aligorith - solved the "offset problems"

1 files changed, 13 insertions, 1 deletions

diff --git a/source/blender/editors/space_sequencer/space_sequencer.c b/source/blender/editors/space_sequencer/space_sequencer.c
index 3643f92d334..dbfc554007a 100644
--- a/source/blender/editors/space_sequencer/space_sequencer.c
+++ b/source/blender/editors/space_sequencer/space_sequencer.c
@@ -485,6 +485,11 @@ static void sequencer_preview_area_listener(ARegion *ar, wmNotifier *wmn)
 {
 	/* context changes */
 	switch (wmn->category) {
+		case NC_SCREEN:
+			if (wmn->data == ND_GPENCIL) {
+				ED_region_tag_redraw(ar);
+			}
+			break;
 		case NC_SCENE:
 			switch (wmn->data) {
 				case ND_FRAME:
@@ -534,6 +539,11 @@ static void sequencer_buttons_area_listener(ARegion *ar, wmNotifier *wmn)
 {
 	/* context changes */
 	switch (wmn->category) {
+		case NC_SCREEN:
+			if (wmn->data == ND_GPENCIL) {
+				ED_region_tag_redraw(ar);
+			}
+			break;
 		case NC_SCENE:
 			switch (wmn->data) {
 				case ND_FRAME:
@@ -590,7 +600,7 @@ void ED_spacetype_sequencer(void)
 	art->init = sequencer_preview_area_init;
 	art->draw = sequencer_preview_area_draw;
 	art->listener = sequencer_preview_area_listener;
-	art->keymapflag = ED_KEYMAP_VIEW2D | ED_KEYMAP_FRAMES | ED_KEYMAP_ANIMATION;
+	art->keymapflag = ED_KEYMAP_VIEW2D | ED_KEYMAP_FRAMES | ED_KEYMAP_GPENCIL;
 	BLI_addhead(&st->regiontypes, art);
 	
 	/* regions: listview/buttons */
@@ -602,6 +612,8 @@ void ED_spacetype_sequencer(void)
 	art->init = sequencer_buttons_area_init;
 	art->draw = sequencer_buttons_area_draw;
 	BLI_addhead(&st->regiontypes, art);
+	
+	sequencer_buttons_register(art);
 
 	/* regions: header */
 	art = MEM_callocN(sizeof(ARegionType), "spacetype sequencer region");