1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "ui/gfx/skia_utils_gtk.h" 6 7 #include <gdk/gdk.h> 8 9 namespace gfx { 10 11 const int kSkiaToGDKMultiplier = 257; 12 13 // GDK_COLOR_RGB multiplies by 257 (= 0x10001) to distribute the bits evenly 14 // See: http://www.mindcontrol.org/~hplus/graphics/expand-bits.html 15 // To get back, we can just right shift by eight 16 // (or, formulated differently, i == (i*257)/256 for all i < 256). 17 GdkColorToSkColor(GdkColor color)18SkColor GdkColorToSkColor(GdkColor color) { 19 return SkColorSetRGB(color.red >> 8, color.green >> 8, color.blue >> 8); 20 } 21 SkColorToGdkColor(SkColor color)22GdkColor SkColorToGdkColor(SkColor color) { 23 GdkColor gdk_color = { 24 0, 25 static_cast<guint16>(SkColorGetR(color) * kSkiaToGDKMultiplier), 26 static_cast<guint16>(SkColorGetG(color) * kSkiaToGDKMultiplier), 27 static_cast<guint16>(SkColorGetB(color) * kSkiaToGDKMultiplier) 28 }; 29 return gdk_color; 30 } 31 32 } // namespace gfx 33