Performance: Draw play head as an overlay

When playing back animations a playhead is updated in all the animation editors.
The drawing of the playhead is part of the drawing of the main region
`RGN_TYPE_WINDOW` that redraws the whole region.

This change will draw the play head and window scrollers when updating the
screen. This affects the Action editor, Timeline, Graph editor, NLA editor and
Sequence editor. There is noticeable speedup when using complex animation files.

Spring 02_020_A.anim.blend fps went from 11.8 to 12.5 when showing a timeline
and a action editor on a Ryzen 1700.

* When playing back animation the markers don't jump up/down when near the
  frame. This could be added back.

Reviewed By: Brecht van Lommel

Differential Revision: https://developer.blender.org/D8066

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/editors/include/ED_anim_api.h b/source/blender/editors/include/ED_anim_api.h
index 426a470b128..f46ef3ff1be 100644
--- a/source/blender/editors/include/ED_anim_api.h
+++ b/source/blender/editors/include/ED_anim_api.h
@@ -640,14 +640,14 @@ bool ANIM_remove_empty_action_from_animdata(struct AnimData *adt);
 /* ---------- Current Frame Drawing ---------------- */
 
 /* flags for Current Frame Drawing */
-enum eAnimEditDraw_CurrentFrame {
+typedef enum eAnimEditDraw_CurrentFrame {
   /* plain time indicator with no special indicators */
   /* DRAWCFRA_PLAIN = 0, */ /* UNUSED */
   /* time indication in seconds or frames */
   DRAWCFRA_UNIT_SECONDS = (1 << 0),
   /* draw indicator extra wide (for timeline) */
   DRAWCFRA_WIDE = (1 << 1),
-};
+} eAnimEditDraw_CurrentFrame;
 
 /* main call to draw current-frame indicator in an Animation Editor */
 void ANIM_draw_cfra(const struct bContext *C, struct View2D *v2d, short flag);