[gtk/wip/matthiasc/opbuffer] gl: Speed up icon cache lookups

[Matthias Clasen <matthiasc src gnome org>]

commit f3280a2f0bdc392a027826dec1c83f492dd7aca4
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Oct 15 08:27:16 2019 -0400

    gl: Speed up icon cache lookups
    
    Use gdk_texture_set_render_data to avoid
    hash table lookups when we can.

 gsk/gl/gskgliconcache.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)
---
diff --git a/gsk/gl/gskgliconcache.c b/gsk/gl/gskgliconcache.c
index 7f2e30257e..fd96ae2101 100644
--- a/gsk/gl/gskgliconcache.c
+++ b/gsk/gl/gskgliconcache.c
@@ -10,7 +10,10 @@
 static void
 icon_data_free (gpointer p)
 {
-  g_object_unref (((IconData *)p)->source_texture);
+  IconData *icon_data = p;
+
+  gdk_texture_clear_render_data (icon_data->source_texture);
+  g_object_unref (icon_data->source_texture);
   g_free (p);
 }
 
@@ -69,7 +72,9 @@ gsk_gl_icon_cache_begin_frame (GskGLIconCache *self,
       while (g_hash_table_iter_next (&iter, (gpointer *)&texture, (gpointer *)&icon_data))
         {
           if (g_ptr_array_find (removed_atlases, icon_data->atlas, NULL))
-            g_hash_table_iter_remove (&iter);
+            {
+              g_hash_table_iter_remove (&iter);
+            }
         }
     }
   
@@ -101,7 +106,12 @@ gsk_gl_icon_cache_lookup_or_add (GskGLIconCache  *self,
                                  GdkTexture      *texture,
                                  const IconData **out_icon_data)
 {
-  IconData *icon_data = g_hash_table_lookup (self->icons, texture);
+  IconData *icon_data;
+
+  icon_data = gdk_texture_get_render_data (texture, self);
+
+  if (!icon_data)
+    icon_data = g_hash_table_lookup (self->icons, texture);
 
   if (icon_data)
     {
@@ -220,6 +230,8 @@ gsk_gl_icon_cache_lookup_or_add (GskGLIconCache  *self,
 
     gdk_gl_context_pop_debug_group (gdk_gl_context_get_current ());
 
+    gdk_texture_set_render_data (texture, self, icon_data, NULL);
+
     *out_icon_data = icon_data;
 
     cairo_surface_destroy (surface);