diff options
Diffstat (limited to 'chromium/ui/gfx/skia_utils_gtk.cc')
-rw-r--r-- | chromium/ui/gfx/skia_utils_gtk.cc | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/chromium/ui/gfx/skia_utils_gtk.cc b/chromium/ui/gfx/skia_utils_gtk.cc new file mode 100644 index 00000000000..f7f3a0aaf2b --- /dev/null +++ b/chromium/ui/gfx/skia_utils_gtk.cc @@ -0,0 +1,32 @@ +// Copyright (c) 2012 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 "ui/gfx/skia_utils_gtk.h" + +#include <gdk/gdk.h> + +namespace gfx { + +const int kSkiaToGDKMultiplier = 257; + +// GDK_COLOR_RGB multiplies by 257 (= 0x10001) to distribute the bits evenly +// See: http://www.mindcontrol.org/~hplus/graphics/expand-bits.html +// To get back, we can just right shift by eight +// (or, formulated differently, i == (i*257)/256 for all i < 256). + +SkColor GdkColorToSkColor(GdkColor color) { + return SkColorSetRGB(color.red >> 8, color.green >> 8, color.blue >> 8); +} + +GdkColor SkColorToGdkColor(SkColor color) { + GdkColor gdk_color = { + 0, + static_cast<guint16>(SkColorGetR(color) * kSkiaToGDKMultiplier), + static_cast<guint16>(SkColorGetG(color) * kSkiaToGDKMultiplier), + static_cast<guint16>(SkColorGetB(color) * kSkiaToGDKMultiplier) + }; + return gdk_color; +} + +} // namespace gfx |