Make the toolbar background themed on Linux.

Add a class for managing images for scalable themed widgets, and then
implement the toolbar on top of this.

Review URL: http://codereview.chromium.org/21390


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@9898 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 39 insertions, 0 deletions

diff --git a/chrome/browser/gtk/nine_box.h b/chrome/browser/gtk/nine_box.h
new file mode 100644
index 0000000..3521a82
--- /dev/null
+++ b/chrome/browser/gtk/nine_box.h
@@ -0,0 +1,39 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_GTK_NINE_BOX_H_
+#define CHROME_BROWSER_GTK_NINE_BOX_H_
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+// A NineBox manages a set of source images representing a 3x3 grid, where
+// non-corner images can be tiled to make a larger image.  It's used to
+// use bitmaps for constructing image-based resizable widgets like buttons.
+//
+// TODO(port): add support for caching server-side pixmaps of prerendered
+// nineboxes.
+class NineBox {
+ public:
+  // Construct a NineBox with nine images.  NULL images are allowed.
+  // Takes ownership of each image, but not the |images| array.
+  NineBox(GdkPixbuf* images[9]);
+  ~NineBox();
+
+  // Render the NineBox to dst.
+  // Expects dst to already be the proper size.
+  void RenderToPixbuf(GdkPixbuf* dst);
+
+  // Render the top row of images to dst between x1 and x2.
+  // This is split from RenderToPixbuf so the toolbar can use it.
+  void RenderTopCenterStrip(GdkPixbuf* dst, int x1, int x2);
+
+ private:
+  // Repeatedly stamp src across dst.
+  void TileImage(GdkPixbuf* src, GdkPixbuf* dst,
+                 int x1, int y1, int x2, int y2);
+
+  GdkPixbuf* images_[9];
+};
+
+#endif  // CHROME_BROWSER_GTK_NINE_BOX_H_