[gtk/wip/matthiasc/opbuffer] icon theme: Avoid mime sniffing

[Matthias Clasen <matthiasc src gnome org>]

commit 8590594b2849ea6592b7664b8d3be4dbaa48d062
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Oct 15 19:05:52 2019 -0400

    icon theme: Avoid mime sniffing
    
    Themed icons are always pngs or svgs.
    Take advantage of that to avoid costly
    mime sniffing.

 gtk/gtkicontheme.c | 31 +++++++++++++++++++------------
 1 file changed, 19 insertions(+), 12 deletions(-)
---
diff --git a/gtk/gtkicontheme.c b/gtk/gtkicontheme.c
index 8a580fb4ac..ee7f7c49bb 100644
--- a/gtk/gtkicontheme.c
+++ b/gtk/gtkicontheme.c
@@ -3384,16 +3384,19 @@ icon_info_ensure_scale_and_texture (GtkIconInfo *icon_info)
                                                                     &icon_info->load_error);
           else if (size == 0)
             source_pixbuf = _gdk_pixbuf_new_from_resource_scaled (icon_info->filename,
+                                                                  "svg",
                                                                   icon_info->desired_scale,
                                                                   &icon_info->load_error);
           else
-            source_pixbuf = gdk_pixbuf_new_from_resource_at_scale (icon_info->filename,
-                                                                   size, size, TRUE,
-                                                                   &icon_info->load_error);
+            source_pixbuf = _gdk_pixbuf_new_from_resource_at_scale (icon_info->filename,
+                                                                    "svg",
+                                                                    size, size, TRUE,
+                                                                    &icon_info->load_error);
         }
       else
-        source_pixbuf = gdk_pixbuf_new_from_resource (icon_info->filename,
-                                                      &icon_info->load_error);
+        source_pixbuf = _gdk_pixbuf_new_from_resource (icon_info->filename,
+                                                       "png",
+                                                       &icon_info->load_error);
     }
   else
     {
@@ -3425,19 +3428,22 @@ icon_info_ensure_scale_and_texture (GtkIconInfo *icon_info)
                                                                     &icon_info->load_error);
               else if (size == 0)
                 source_pixbuf = _gdk_pixbuf_new_from_stream_scaled (stream,
+                                                                    "svg",
                                                                     icon_info->desired_scale,
                                                                     NULL,
                                                                     &icon_info->load_error);
               else
-                source_pixbuf = gdk_pixbuf_new_from_stream_at_scale (stream,
-                                                                     size, size,
-                                                                     TRUE, NULL,
+                source_pixbuf = _gdk_pixbuf_new_from_stream_at_scale (stream,
+                                                                      "svg",
+                                                                      size, size,
+                                                                      TRUE, NULL,
                                                                      &icon_info->load_error);
             }
           else
-            source_pixbuf = gdk_pixbuf_new_from_stream (stream,
-                                                        NULL,
-                                                        &icon_info->load_error);
+            source_pixbuf = _gdk_pixbuf_new_from_stream (stream,
+                                                         "png",
+                                                         NULL,
+                                                         &icon_info->load_error);
           g_object_unref (stream);
         }
     }
@@ -3938,7 +3944,8 @@ gtk_icon_info_load_symbolic_svg (GtkIconInfo    *icon_info,
   g_free (height);
 
   stream = g_memory_input_stream_new_from_data (data, -1, g_free);
-  pixbuf = gdk_pixbuf_new_from_stream_at_scale (stream,
+  pixbuf = _gdk_pixbuf_new_from_stream_at_scale (stream,
+                                                 "svg",
                                                 gdk_texture_get_width (icon_info->texture),
                                                 gdk_texture_get_height (icon_info->texture),
                                                 TRUE,