[sfnt] If `COLR' is present, don't assume that all glyphs use it.

* src/sfnt/ttcolr.c (tt_face_load_colr_layers): Return FT_Err_Ok if
current glyph is not a `COLR' base glyph.

* src/truetype/ttgload.c (TT_Load_Glyph): Don't allocate
`color_layers' if there are no color layers.

ChangeLog

@@ -1,3 +1,13 @@
+2018-05-15  Werner Lemberg  <wl@gnu.org>
+
+	[sfnt] If `COLR' is present, don't assume that all glyphs use it.
+
+	* src/sfnt/ttcolr.c (tt_face_load_colr_layers): Return FT_Err_Ok if
+	current glyph is not a `COLR' base glyph.
+
+	* src/truetype/ttgload.c (TT_Load_Glyph): Don't allocate
+	`color_layers' if there are no color layers.
+
 2018-05-14  Werner Lemberg  <wl@gnu.org>
 
 	* src/base/ftobjs.c (FT_Load_Glyph): Fix signature of `pixel_modes'.

src/base/ftobjs.c

@@ -4526,7 +4526,7 @@
       break;
 
     default:
-      if ( slot->internal->color_layers != NULL )
+      if ( slot->internal->color_layers )
       {
         FT_Face  face = slot->face;
 

src/sfnt/ttcolr.c

@@ -315,7 +315,12 @@
                                   colr->num_base_glyphs,
                                   glyph_id,
                                   &glyph_record ) )
-      return FT_THROW ( Invalid_Table );
+    {
+      *ret_layers     = NULL;
+      *ret_num_layers = 0;
+
+      return FT_Err_Ok;
+    }
 
     /* Load all colors for the glyphs; this would be stored in the slot. */
     layer_record_ptr = colr->layers +

src/truetype/ttgload.c

@@ -2913,14 +2913,17 @@
       if ( error )
         return error;
 
-      if ( FT_NEW( color_layers ) )
-        return error;
+      if ( num_glyph_layers )
+      {
+        if ( FT_NEW( color_layers ) )
+          return error;
 
-      color_layers->layers     = glyph_layers;
-      color_layers->num_layers = num_glyph_layers;
-      color_layers->load_flags = load_flags;
+        color_layers->layers     = glyph_layers;
+        color_layers->num_layers = num_glyph_layers;
+        color_layers->load_flags = load_flags;
 
-      glyph->internal->color_layers = color_layers;
+        glyph->internal->color_layers = color_layers;
+      }
     }
 
   Exit: