[gnome-shell] st-texture-cache: Save cairo surfaces to a different map

[Marco Trevisan <marcotrevi src gnome org>]

commit 1f03599d1cf888f73a33363212b99905064e2c9e
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Tue Apr 17 04:53:02 2018 -0500

    st-texture-cache: Save cairo surfaces to a different map
    
    The default keyed_surface is meant to handle CoglTextures thus we can't
    add cairo surfaces to it, as the DestroyNotify function won't handle them.
    
    Then the quicker way is to just add another Hash table for handling
    such types of textures, with proper destroy function.

 src/st/st-texture-cache.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)
---
diff --git a/src/st/st-texture-cache.c b/src/st/st-texture-cache.c
index 58185120e..0c794a3ab 100644
--- a/src/st/st-texture-cache.c
+++ b/src/st/st-texture-cache.c
@@ -37,6 +37,7 @@ struct _StTextureCachePrivate
 
   /* Things that were loaded with a cache policy != NONE */
   GHashTable *keyed_cache; /* char * -> CoglTexture* */
+  GHashTable *keyed_surface_cache; /* char * -> cairo_surface_t* */
 
   /* Presently this is used to de-duplicate requests for GIcons and async URIs. */
   GHashTable *outstanding_requests; /* char * -> AsyncTextureLoadData * */
@@ -145,6 +146,10 @@ st_texture_cache_init (StTextureCache *self)
 
   self->priv->keyed_cache = g_hash_table_new_full (g_str_hash, g_str_equal,
                                                    g_free, cogl_object_unref);
+  self->priv->keyed_surface_cache = g_hash_table_new_full (g_str_hash,
+                                                           g_str_equal,
+                                                           g_free,
+                                                           (GDestroyNotify) cairo_surface_destroy);
   self->priv->outstanding_requests = g_hash_table_new_full (g_str_hash, g_str_equal,
                                                             g_free, NULL);
   self->priv->file_monitors = g_hash_table_new_full (g_file_hash, (GEqualFunc) g_file_equal,
@@ -166,6 +171,7 @@ st_texture_cache_dispose (GObject *object)
     }
 
   g_clear_pointer (&self->priv->keyed_cache, g_hash_table_destroy);
+  g_clear_pointer (&self->priv->keyed_surface_cache, g_hash_table_destroy);
   g_clear_pointer (&self->priv->outstanding_requests, g_hash_table_destroy);
   g_clear_pointer (&self->priv->file_monitors, g_hash_table_destroy);
 
@@ -988,7 +994,7 @@ file_changed_cb (GFileMonitor      *monitor,
   g_free (key);
 
   key = g_strdup_printf (CACHE_PREFIX_FILE_FOR_CAIRO "%u", file_hash);
-  g_hash_table_remove (cache->priv->keyed_cache, key);
+  g_hash_table_remove (cache->priv->keyed_surface_cache, key);
   g_free (key);
 
   g_signal_emit (cache, signals[TEXTURE_FILE_CHANGED], 0, file);
@@ -1309,7 +1315,7 @@ st_texture_cache_load_file_sync_to_cairo_surface (StTextureCache        *cache,
 
   key = g_strdup_printf (CACHE_PREFIX_FILE_FOR_CAIRO "%u", g_file_hash (file));
 
-  surface = g_hash_table_lookup (cache->priv->keyed_cache, key);
+  surface = g_hash_table_lookup (cache->priv->keyed_surface_cache, key);
 
   if (surface == NULL)
     {
@@ -1323,7 +1329,8 @@ st_texture_cache_load_file_sync_to_cairo_surface (StTextureCache        *cache,
       if (policy == ST_TEXTURE_CACHE_POLICY_FOREVER)
         {
           cairo_surface_reference (surface);
-          g_hash_table_insert (cache->priv->keyed_cache, g_strdup (key), surface);
+          g_hash_table_insert (cache->priv->keyed_surface_cache,
+                               g_strdup (key), surface);
         }
     }
   else