Viewport Text Drawing: replace single allocs with a memarena

- pass label strlen since in many cases its already known.
- use single linked list for cached text drawing.
- add BLI_link_utils.h for single linked list macros.

own tests give approx 22% overall speedup.

1 files changed, 3 insertions, 1 deletions

diff --git a/source/blender/editors/space_view3d/view3d_intern.h b/source/blender/editors/space_view3d/view3d_intern.h
index 9bc498808ec..3e7c97abaa9 100644
--- a/source/blender/editors/space_view3d/view3d_intern.h
+++ b/source/blender/editors/space_view3d/view3d_intern.h
@@ -140,7 +140,9 @@ void draw_object_backbufsel(Scene *scene, View3D *v3d, RegionView3D *rv3d, struc
 void drawaxes(float size, char drawtype);
 
 void view3d_cached_text_draw_begin(void);
-void view3d_cached_text_draw_add(const float co[3], const char *str, short xoffs, short flag, const unsigned char col[4]);
+void view3d_cached_text_draw_add(const float co[3],
+                                 const char *str, const size_t str_len,
+                                 short xoffs, short flag, const unsigned char col[4]);
 void view3d_cached_text_draw_end(View3D *v3d, ARegion *ar, bool depth_write, float mat[4][4]);
 
 bool check_object_draw_texture(struct Scene *scene, struct View3D *v3d, const char drawtype);