Adding a skia utils for Gtk.

BUG=None
TEST=None

See original review:
http://codereview.chromium.org/179048/show

Review URL: http://codereview.chromium.org/177053

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25042 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 49 insertions, 0 deletions

diff --git a/skia/ext/skia_utils_gtk.cc b/skia/ext/skia_utils_gtk.cc
new file mode 100644
index 0000000..7989019
--- /dev/null
+++ b/skia/ext/skia_utils_gtk.cc
@@ -0,0 +1,27 @@
+// 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 "skia/ext/skia_utils_gtk.h"
+
+#include <gdk/gdkcolor.h>
+
+namespace skia {
+
+const int kSkiaToGDKMultiplier = 257;
+
+SkColor GdkColorToSkColor(GdkColor color) {
+  return SkColorSetRGB(color.red, color.green, color.blue);
+}
+
+GdkColor SkColorToGdkColor(SkColor color) {
+  GdkColor gdk_color = {
+      0,
+      SkColorGetR(color) * kSkiaToGDKMultiplier,
+      SkColorGetG(color) * kSkiaToGDKMultiplier,
+      SkColorGetB(color) * kSkiaToGDKMultiplier
+  };
+  return gdk_color;
+}
+
+}  // namespace
diff --git a/skia/ext/skia_utils_gtk.h b/skia/ext/skia_utils_gtk.h
new file mode 100644
index 0000000..c9e993d
--- /dev/null
+++ b/skia/ext/skia_utils_gtk.h
@@ -0,0 +1,22 @@
+// 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 SKIA_EXT_SKIA_UTILS_GTK_H_
+#define SKIA_EXT_SKIA_UTILS_GTK_H_
+
+#include "third_party/skia/include/core/SkColor.h"
+
+typedef struct _GdkColor GdkColor;
+
+namespace skia {
+
+// Converts GdkColors to the ARGB layout Skia expects.
+SkColor GdkColorToSkColor(GdkColor color);
+
+// Converts ARGB to GdkColor.
+GdkColor SkColorToGdkColor(SkColor color);
+
+}  // namespace skia
+
+#endif  // SKIA_EXT_SKIA_UTILS_GTK_H_