[gtk+] themingengine: Don't modify pattern

[Benjamin Otte <otte src gnome org>]

commit 88026c507351d620ffe9008d554cf4b36ac4068a
Author: Benjamin Otte <otte redhat com>
Date:   Thu Jun 9 04:50:12 2011 +0200

    themingengine: Don't modify pattern
    
    Instead, scale/unscale the cairo_t.

 gtk/gtkthemingengine.c |   42 +++++-------------------------------------
 1 files changed, 5 insertions(+), 37 deletions(-)
---
diff --git a/gtk/gtkthemingengine.c b/gtk/gtkthemingengine.c
index 6f0f392..9cb7e33 100644
--- a/gtk/gtkthemingengine.c
+++ b/gtk/gtkthemingengine.c
@@ -1490,32 +1490,6 @@ _cairo_uneven_frame (cairo_t                  *cr,
                                 SIDE_ALL);
 }
 
-/* Set the appropriate matrix for
- * patterns coming from the style context
- */
-static void
-style_pattern_set_matrix (cairo_pattern_t *pattern,
-                          gdouble          width,
-                          gdouble          height)
-{
-  cairo_matrix_t matrix;
-  gint w, h;
-
-  if (cairo_pattern_get_type (pattern) == CAIRO_PATTERN_TYPE_SURFACE)
-    {
-      cairo_surface_t *surface;
-
-      cairo_pattern_get_surface (pattern, &surface);
-      w = cairo_image_surface_get_width (surface);
-      h = cairo_image_surface_get_height (surface);
-    }
-  else
-    w = h = 1;
-
-  cairo_matrix_init_scale (&matrix, (gdouble) w / width, (gdouble) h / height);
-  cairo_pattern_set_matrix (pattern, &matrix);
-}
-
 static void
 render_background_internal (GtkThemingEngine *engine,
                             cairo_t          *cr,
@@ -1537,7 +1511,6 @@ render_background_internal (GtkThemingEngine *engine,
   gint border_width;
   GtkBorderStyle border_style;
   gdouble mat_w, mat_h;
-  cairo_matrix_t identity;
 
   /* Use unmodified size for pattern scaling */
   mat_w = width;
@@ -1545,8 +1518,6 @@ render_background_internal (GtkThemingEngine *engine,
 
   flags = gtk_theming_engine_get_state (engine);
 
-  cairo_matrix_init_identity (&identity);
-
   gtk_theming_engine_get_background_color (engine, flags, &bg_color);
   gtk_theming_engine_get_border (engine, flags, &border);
 
@@ -1703,12 +1674,11 @@ render_background_internal (GtkThemingEngine *engine,
                                             0, 0, width, height,
                                             SIDE_ALL);
 
-              style_pattern_set_matrix (other_pattern, mat_w, mat_h);
+              cairo_scale (cr, mat_w, mat_h);
               cairo_set_source (cr, other_pattern);
+              cairo_scale (cr, 1.0 / mat_w, 1.0 / mat_h);
               cairo_fill_preserve (cr);
 
-              cairo_pattern_set_matrix (other_pattern, &identity);
-
               /* Set alpha for posterior drawing
                * of the target pattern
                */
@@ -1789,8 +1759,9 @@ render_background_internal (GtkThemingEngine *engine,
                                 SIDE_ALL);
   if (pattern)
     {
-      style_pattern_set_matrix (pattern, mat_w, mat_h);
+      cairo_scale (cr, mat_w, mat_h);
       cairo_set_source (cr, pattern);
+      cairo_scale (cr, 1.0 / mat_w, 1.0 / mat_h);
     }
   else
     gdk_cairo_set_source_rgba (cr, &bg_color);
@@ -1826,10 +1797,7 @@ render_background_internal (GtkThemingEngine *engine,
     }
 
   if (pattern)
-    {
-      cairo_pattern_set_matrix (pattern, &identity);
-      cairo_pattern_destroy (pattern);
-    }
+    cairo_pattern_destroy (pattern);
 
   cairo_restore (cr);
 }