Disable scope updates in texture and image paint modes.

Scope update is very slow for high resolutions, and currently blocks
the UI thread(!). This is especially terrible in paint modes, where
each stroke causes a scope update and unacceptable freezing.

The scopes update method tries to avoid this somewhat by skipping if the
toolbar is disabled, but this doesn't help when painting where brush
tools etc. are frequently needed. It's also a bad-level poll, with the
core system accessing a UI element.

Eventually scope updates should become a low-priority background job,
as well as becoming threaded. Until then this polling provides a usable
workaround to the most outrageous cases.

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/editors/include/ED_image.h b/source/blender/editors/include/ED_image.h
index 1188ecd0aa5..704876e1261 100644
--- a/source/blender/editors/include/ED_image.h
+++ b/source/blender/editors/include/ED_image.h
@@ -35,6 +35,7 @@ struct Main;
 struct bContext;
 struct Image;
 struct ImageUser;
+struct ImBuf;
 struct ToolSettings;
 struct uiBlock;
 struct wmWindowManager;
@@ -58,6 +59,8 @@ void ED_space_image_get_aspect(struct SpaceImage *sima, float *aspx, float *aspy
 void ED_space_image_get_zoom(struct SpaceImage *sima, struct ARegion *ar, float *zoomx, float *zoomy);
 void ED_space_image_get_uv_aspect(struct SpaceImage *sima, float *aspx, float *aspy);
 
+void ED_space_image_scopes_update(const struct bContext *C, struct SpaceImage *sima, struct ImBuf *ibuf, bool use_view_settings);
+
 void ED_space_image_paint_update(struct wmWindowManager *wm, struct ToolSettings *settings);
 void ED_space_image_uv_sculpt_update(struct wmWindowManager *wm, struct ToolSettings *settings);