BLF: Implement FreeType Caching

Implementation of the FreeType 2 cache subsystem, which limits the
number of concurrently-opened FT_Face and FT_Size objects, as well as
caching information like character maps to speed up glyph id lookups.

See D13137 for much more detail.

Differential Revision: https://developer.blender.org/D13137

Reviewed by Brecht Van Lommel

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/blenfont/intern/blf_internal_types.h b/source/blender/blenfont/intern/blf_internal_types.h
index 018cef4540f..007b717ab93 100644
--- a/source/blender/blenfont/intern/blf_internal_types.h
+++ b/source/blender/blenfont/intern/blf_internal_types.h
@@ -329,6 +329,12 @@ typedef struct FontBLF {
   /* freetype2 face. */
   FT_Face face;
 
+  /* FreeType size is separated from face when using their caching subsystem. */
+  FT_Size ft_size;
+
+  /* Copy of the font->face->face_flags, in case we don't have a face loaded. */
+  FT_Long face_flags;
+
   /* data for buffer usage (drawing into a texture buffer) */
   FontBufInfoBLF buf_info;