BLF: make library glyph cache handling thread-safe

Functions that utilize glyph cache should lock and unlock cache by
calling `blf_glyph_cache_acquire()` and `blf_glyph_cache_release()`.
Function `blf_glyph_cache_acquire()` will create glyph cache, if it doesn't exist.
Locking mutex is global and shared by all fonts.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5701

1 files changed, 20 insertions, 16 deletions

diff --git a/source/blender/blenfont/intern/blf.c b/source/blender/blenfont/intern/blf.c
index 793e9805899..8e1ff77b1c7 100644
--- a/source/blender/blenfont/intern/blf.c
+++ b/source/blender/blenfont/intern/blf.c
@@ -608,7 +608,7 @@ void BLF_draw_ex(int fontid, const char *str, size_t len, struct ResultBLF *r_in
 
   BLF_RESULT_CHECK_INIT(r_info);
 
-  if (font && font->glyph_cache) {
+  if (font) {
     blf_draw_gl__start(font);
     if (font->flags & BLF_WORD_WRAP) {
       blf_font_draw__wrap(font, str, len, r_info);
@@ -634,7 +634,7 @@ void BLF_draw_ascii_ex(int fontid, const char *str, size_t len, struct ResultBLF
 
   BLF_RESULT_CHECK_INIT(r_info);
 
-  if (font && font->glyph_cache) {
+  if (font) {
     blf_draw_gl__start(font);
     if (font->flags & BLF_WORD_WRAP) {
       /* use non-ascii draw function for word-wrap */
@@ -646,6 +646,7 @@ void BLF_draw_ascii_ex(int fontid, const char *str, size_t len, struct ResultBLF
     blf_draw_gl__end(font);
   }
 }
+
 void BLF_draw_ascii(int fontid, const char *str, size_t len)
 {
   if (len == 0 || str[0] == '\0') {
@@ -664,7 +665,7 @@ int BLF_draw_mono(int fontid, const char *str, size_t len, int cwidth)
   FontBLF *font = blf_get(fontid);
   int columns = 0;
 
-  if (font && font->glyph_cache) {
+  if (font) {
     blf_draw_gl__start(font);
     columns = blf_font_draw_mono(font, str, len, cwidth);
     blf_draw_gl__end(font);
@@ -729,6 +730,7 @@ void BLF_boundbox_ex(
     }
   }
 }
+
 void BLF_boundbox(int fontid, const char *str, size_t len, rctf *r_box)
 {
   BLF_boundbox_ex(fontid, str, len, r_box, NULL);
@@ -738,7 +740,7 @@ void BLF_width_and_height(int fontid, const char *str, size_t len, float *r_widt
 {
   FontBLF *font = blf_get(fontid);
 
-  if (font && font->glyph_cache) {
+  if (font) {
     blf_font_width_and_height(font, str, len, r_width, r_height, NULL);
   }
   else {
@@ -752,12 +754,13 @@ float BLF_width_ex(int fontid, const char *str, size_t len, struct ResultBLF *r_
 
   BLF_RESULT_CHECK_INIT(r_info);
 
-  if (font && font->glyph_cache) {
+  if (font) {
     return blf_font_width(font, str, len, r_info);
   }
 
   return 0.0f;
 }
+
 float BLF_width(int fontid, const char *str, size_t len)
 {
   return BLF_width_ex(fontid, str, len, NULL);
@@ -767,7 +770,7 @@ float BLF_fixed_width(int fontid)
 {
   FontBLF *font = blf_get(fontid);
 
-  if (font && font->glyph_cache) {
+  if (font) {
     return blf_font_fixed_width(font);
   }
 
@@ -780,12 +783,13 @@ float BLF_height_ex(int fontid, const char *str, size_t len, struct ResultBLF *r
 
   BLF_RESULT_CHECK_INIT(r_info);
 
-  if (font && font->glyph_cache) {
+  if (font) {
     return blf_font_height(font, str, len, r_info);
   }
 
   return 0.0f;
 }
+
 float BLF_height(int fontid, const char *str, size_t len)
 {
   return BLF_height_ex(fontid, str, len, NULL);
@@ -795,8 +799,8 @@ int BLF_height_max(int fontid)
 {
   FontBLF *font = blf_get(fontid);
 
-  if (font && font->glyph_cache) {
-    return font->glyph_cache->glyph_height_max;
+  if (font) {
+    return blf_font_height_max(font);
   }
 
   return 0;
@@ -806,8 +810,8 @@ float BLF_width_max(int fontid)
 {
   FontBLF *font = blf_get(fontid);
 
-  if (font && font->glyph_cache) {
-    return font->glyph_cache->glyph_width_max;
+  if (font) {
+    return blf_font_width_max(font);
   }
 
   return 0.0f;
@@ -817,8 +821,8 @@ float BLF_descender(int fontid)
 {
   FontBLF *font = blf_get(fontid);
 
-  if (font && font->glyph_cache) {
-    return font->glyph_cache->descender;
+  if (font) {
+    return blf_font_descender(font);
   }
 
   return 0.0f;
@@ -828,8 +832,8 @@ float BLF_ascender(int fontid)
 {
   FontBLF *font = blf_get(fontid);
 
-  if (font && font->glyph_cache) {
-    return font->glyph_cache->ascender;
+  if (font) {
+    return blf_font_ascender(font);
   }
 
   return 0.0f;
@@ -939,7 +943,7 @@ void BLF_draw_buffer_ex(int fontid, const char *str, size_t len, struct ResultBL
 {
   FontBLF *font = blf_get(fontid);
 
-  if (font && font->glyph_cache && (font->buf_info.fbuf || font->buf_info.cbuf)) {
+  if (font && (font->buf_info.fbuf || font->buf_info.cbuf)) {
     blf_draw_buffer__start(font);
     if (font->flags & BLF_WORD_WRAP) {
       blf_font_draw_buffer__wrap(font, str, len, r_info);