| // 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 |