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, 11 insertions, 2 deletions

diff --git a/source/blender/blenfont/intern/blf_internal.h b/source/blender/blenfont/intern/blf_internal.h
index 6207edb0107..8ff00d05e02 100644
--- a/source/blender/blenfont/intern/blf_internal.h
+++ b/source/blender/blenfont/intern/blf_internal.h
@@ -14,9 +14,16 @@ struct ResultBLF;
 struct rctf;
 struct rcti;
 
-/* Max number of fonts in memory. Take care that every font has a glyph cache per size/dpi,
+/* Max number of FontBLFs in memory. Take care that every font has a glyph cache per size/dpi,
  * so we don't need load the same font with different size, just load one and call BLF_size. */
-#define BLF_MAX_FONT 32
+#define BLF_MAX_FONT 64
+
+/* Maximum number of opened FT_Face objects managed by cache. 0 is default of 2. */
+#define BLF_CACHE_MAX_FACES 0
+/* Maximum number of opened FT_Size objects managed by cache. 0 is default of 4 */
+#define BLF_CACHE_MAX_SIZES 0
+/* Maximum number of bytes to use for cached data nodes. 0 is default of 200,000. */
+#define BLF_CACHE_BYTES 0
 
 extern struct FontBLF *global_font[BLF_MAX_FONT];
 
@@ -39,6 +46,8 @@ void blf_font_exit(void);
 
 bool blf_font_id_is_valid(int fontid);
 
+uint blf_get_char_index(struct FontBLF *font, uint charcode);
+
 bool blf_ensure_face(struct FontBLF *font);
 
 void blf_draw_buffer__start(struct FontBLF *font);