BLF: Fallback Font Stack

Allow use of multiple fonts acting together like a fallback stack,
where if a glyph is not found in one it can be retrieved from another.

See D12622 for much more detail

Differential Revision: https://developer.blender.org/D12622

Reviewed by Brecht Van Lommel

1 files changed, 20 insertions, 8 deletions

diff --git a/source/blender/blenfont/intern/blf.c b/source/blender/blenfont/intern/blf.c
index a944ab332bd..a1fcc17ca3f 100644
--- a/source/blender/blenfont/intern/blf.c
+++ b/source/blender/blenfont/intern/blf.c
@@ -34,13 +34,6 @@
 #include "blf_internal.h"
 #include "blf_internal_types.h"
 
-/* Max number of font in memory.
- * Take care that now every font have 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 16
-
 #define BLF_RESULT_CHECK_INIT(r_info) \
   if (r_info) { \
     memset(r_info, 0, sizeof(*(r_info))); \
@@ -48,7 +41,7 @@
   ((void)0)
 
 /* Font array. */
-static FontBLF *global_font[BLF_MAX_FONT] = {NULL};
+FontBLF *global_font[BLF_MAX_FONT] = {NULL};
 
 /* XXX: should these be made into global_font_'s too? */
 
@@ -134,6 +127,11 @@ bool BLF_has_glyph(int fontid, unsigned int unicode)
   return false;
 }
 
+bool BLF_is_loaded(const char *name)
+{
+  return blf_search(name) >= 0;
+}
+
 int BLF_load(const char *name)
 {
   /* check if we already load this font. */
@@ -255,6 +253,20 @@ void BLF_unload_id(int fontid)
   }
 }
 
+void BLF_unload_all(void)
+{
+  for (int i = 0; i < BLF_MAX_FONT; i++) {
+    FontBLF *font = global_font[i];
+    if (font) {
+      blf_font_free(font);
+      global_font[i] = NULL;
+    }
+  }
+  blf_mono_font = -1;
+  blf_mono_font_render = -1;
+  BLF_default_set(-1);
+}
+
 void BLF_enable(int fontid, int option)
 {
   FontBLF *font = blf_get(fontid);