[gtk+/gtk-style-context] Gtk9Slice: Fix stretch rendering.

[Carlos Garnacho <carlosg src gnome org>]

commit ed20f1669a27c8468c8ac26e0a753abf1f884fa4
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Dec 1 20:25:52 2010 +0100

    Gtk9Slice: Fix stretch rendering.
    
    "Nearest" filter used when scaling the image, so image borders
    aren't blurred.

 gtk/gtk9slice.c |   20 +++++++++++---------
 1 files changed, 11 insertions(+), 9 deletions(-)
---
diff --git a/gtk/gtk9slice.c b/gtk/gtk9slice.c
index 6200899..13234a8 100644
--- a/gtk/gtk9slice.c
+++ b/gtk/gtk9slice.c
@@ -192,6 +192,7 @@ render_border (cairo_t              *cr,
                gdouble               height,
                GtkSliceSideModifier  modifier)
 {
+  cairo_pattern_t *pattern;
   cairo_matrix_t matrix;
 
   cairo_save (cr);
@@ -199,18 +200,15 @@ render_border (cairo_t              *cr,
   cairo_rectangle (cr, x, y, width, height);
   cairo_clip (cr);
 
+  pattern = cairo_pattern_create_for_surface (surface);
+
   if (modifier == GTK_SLICE_REPEAT)
     {
-      cairo_pattern_t *pattern;
-
-      pattern = cairo_pattern_create_for_surface (surface);
-
       cairo_matrix_init_translate (&matrix, - x, - y);
       cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
 
       cairo_pattern_set_matrix (pattern, &matrix);
       cairo_set_source (cr, pattern);
-      cairo_pattern_destroy (pattern);
 
       cairo_rectangle (cr, x, y, width, height);
       cairo_fill (cr);
@@ -219,14 +217,16 @@ render_border (cairo_t              *cr,
     {
       gint d;
 
+      /* Use nearest filter so borders aren't blurred */
+      cairo_pattern_set_filter (pattern, CAIRO_FILTER_NEAREST);
+      cairo_rectangle (cr, x, y, width, height);
+
       if (side == SIDE_TOP || side == SIDE_BOTTOM)
         {
           d = cairo_image_surface_get_width (surface);
 
           cairo_translate (cr, x, y);
           cairo_scale (cr, width / d, 1.0);
-          cairo_set_source_surface (cr, surface, 0.0, 0.0);
-          cairo_paint (cr);
         }
       else
         {
@@ -234,12 +234,14 @@ render_border (cairo_t              *cr,
 
           cairo_translate (cr, x, y);
           cairo_scale (cr, 1.0, height / d);
-          cairo_set_source_surface (cr, surface, 0.0, 0.0);
-          cairo_paint (cr);
         }
+
+      cairo_paint (cr);
     }
 
   cairo_restore (cr);
+
+  cairo_pattern_destroy (pattern);
 }
 
 static void