Fix drawing leakage: delay glyph allocation

Delay allocation of the "faux" glyph until a drawing is parsed.
This helps with fixing a (pretty bad) memory leak and also reduces frame
overhead a little.

4 files changed, 17 insertions, 15 deletions

diff --git a/libass/ass_drawing.c b/libass/ass_drawing.c
index 7833c10..93cc458 100644
--- a/libass/ass_drawing.c
+++ b/libass/ass_drawing.c
@@ -34,13 +34,13 @@
  * \brief Get and prepare a FreeType glyph
  */
 static void drawing_make_glyph(ASS_Drawing *drawing, void *fontconfig_priv,
-                               ASS_Font *font, ASS_Hinting hint)
+                               ASS_Font *font)
 {
     FT_OutlineGlyph glyph;
 
     // This is hacky...
     glyph = (FT_OutlineGlyph) ass_font_get_glyph(fontconfig_priv, font,
-                                                 (uint32_t) ' ', hint, 0);
+                                                 (uint32_t) ' ', 0, 0);
     if (glyph) {
         FT_Outline_Done(drawing->ftlibrary, &glyph->outline);
         FT_Outline_New(drawing->ftlibrary, GLYPH_INITIAL_POINTS,
@@ -355,7 +355,7 @@ static void drawing_evaluate_curve(ASS_Drawing *drawing,
  * \brief Create and initialize a new drawing and return it
  */
 ASS_Drawing *ass_drawing_new(void *fontconfig_priv, ASS_Font *font,
-                             ASS_Hinting hint, FT_Library lib)
+                             FT_Library lib)
 {
     ASS_Drawing *drawing;
 
@@ -364,12 +364,10 @@ ASS_Drawing *ass_drawing_new(void *fontconfig_priv, ASS_Font *font,
     drawing->size = DRAWING_INITIAL_SIZE;
     drawing->cbox.xMin = drawing->cbox.yMin = INT_MAX;
     drawing->cbox.xMax = drawing->cbox.yMax = INT_MIN;
-
+    drawing->fontconfig_priv = fontconfig_priv;
+    drawing->font = font;
     drawing->ftlibrary = lib;
-    if (font) {
-        drawing->library = font->library;
-        drawing_make_glyph(drawing, fontconfig_priv, font, hint);
-    }
+    drawing->library = font->library;
 
     drawing->scale_x = 1.;
     drawing->scale_y = 1.;
@@ -422,6 +420,8 @@ FT_OutlineGlyph *ass_drawing_parse(ASS_Drawing *drawing, int raw_mode)
     ASS_DrawingToken *token;
     FT_Vector pen = {0, 0};
 
+    if (drawing->font)
+        drawing_make_glyph(drawing, drawing->fontconfig_priv, drawing->font);
     if (!drawing->glyph)
         return NULL;
 
diff --git a/libass/ass_drawing.h b/libass/ass_drawing.h
index 0223271..f677fcd 100644
--- a/libass/ass_drawing.h
+++ b/libass/ass_drawing.h
@@ -57,7 +57,9 @@ typedef struct {
     int hash;           // hash value (for caching)
 
     // private
-    FT_Library ftlibrary;   // FT library instance, needed for font ops
+    FT_Library ftlibrary;   // needed for font ops
+    ASS_Font *font;         // dito
+    void *fontconfig_priv;  // dito
     ASS_Library *library;
     int size;           // current buffer size
     ASS_DrawingToken *tokens;    // tokenized drawing
@@ -69,7 +71,7 @@ typedef struct {
 } ASS_Drawing;
 
 ASS_Drawing *ass_drawing_new(void *fontconfig_priv, ASS_Font *font,
-                             ASS_Hinting hint, FT_Library lib);
+                             FT_Library lib);
 void ass_drawing_free(ASS_Drawing* drawing);
 void ass_drawing_add_char(ASS_Drawing* drawing, char symbol);
 void ass_drawing_hash(ASS_Drawing* drawing);
diff --git a/libass/ass_parse.c b/libass/ass_parse.c
index 654fa7f..cac5760 100644
--- a/libass/ass_parse.c
+++ b/libass/ass_parse.c
@@ -214,13 +214,14 @@ static char *parse_vector_clip(ASS_Renderer *render_priv, char *p)
 {
     int scale = 1;
     int res = 0;
-    ASS_Drawing *drawing;
+    ASS_Drawing *drawing = render_priv->state.clip_drawing;
 
-    ass_drawing_free(render_priv->state.clip_drawing);
+    if (drawing && drawing->glyph)
+        FT_Done_Glyph((FT_Glyph) drawing->glyph);
+    ass_drawing_free(drawing);
     render_priv->state.clip_drawing = ass_drawing_new(
         render_priv->fontconfig_priv,
         render_priv->state.font,
-        render_priv->settings.hinting,
         render_priv->ftlibrary);
     drawing = render_priv->state.clip_drawing;
     skipopt('(');
diff --git a/libass/ass_render.c b/libass/ass_render.c
index 3e241c1..caea6b9 100644
--- a/libass/ass_render.c
+++ b/libass/ass_render.c
@@ -911,9 +911,9 @@ init_render_context(ASS_Renderer *render_priv, ASS_Event *event)
     render_priv->state.effect_type = EF_NONE;
     render_priv->state.effect_timing = 0;
     render_priv->state.effect_skip_timing = 0;
+    ass_drawing_free(render_priv->state.drawing);
     render_priv->state.drawing = ass_drawing_new(render_priv->fontconfig_priv,
                                                  render_priv->state.font,
-                                                 render_priv->settings.hinting,
                                                  render_priv->ftlibrary);
 
     apply_transition_effects(render_priv, event);
@@ -1900,7 +1900,6 @@ ass_render_event(ASS_Renderer *render_priv, ASS_Event *event,
             drawing = render_priv->state.drawing =
                 ass_drawing_new(render_priv->fontconfig_priv,
                     render_priv->state.font,
-                    render_priv->settings.hinting,
                     render_priv->ftlibrary);
         }
     }