Add a gtk_utils (like gdi_utils), with region rectangle subtraction.

This will be used like the gdi functions, for constructing clipping regions.

Add ToGdkRectangle() on gfx::Rect, similar to the win32 and CG methods.

Make the scons file better reflect which files are platform specific.

Review URL: http://codereview.chromium.org/20259


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@9574 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 24 insertions, 0 deletions

diff --git a/base/gfx/gtk_util.cc b/base/gfx/gtk_util.cc
new file mode 100755
index 0000000..26601ca
--- /dev/null
+++ b/base/gfx/gtk_util.cc
@@ -0,0 +1,24 @@
+// 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.
+
+#include "base/gfx/gtk_util.h"
+
+#include <gdk/gdk.h>
+
+#include "base/gfx/rect.h"
+
+namespace gfx {
+
+void SubtractRectanglesFromRegion(GdkRegion* region,
+                                  const std::vector<gfx::Rect>& cutouts) {
+  for (size_t i = 0; i < cutouts.size(); ++i) {
+    GdkRectangle rect = cutouts[i].ToGdkRectangle();
+    GdkRegion* rect_region = gdk_region_rectangle(&rect);
+    gdk_region_subtract(region, rect_region);
+    // TODO(deanm): It would be nice to be able to reuse the GdkRegion here.
+    gdk_region_destroy(rect_region);
+  }
+}
+
+}  // namespace gfx