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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #include "chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h" | 5 #include "chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h" |
| 6 | 6 |
| 7 #include <gdk/gdk.h> | 7 #include <gdk/gdk.h> |
| 8 | 8 |
| 9 #include "base/basictypes.h" | 9 #include "base/basictypes.h" |
| 10 #include "base/logging.h" | 10 #include "base/logging.h" |
| 11 #include "third_party/skia/include/core/SkBitmap.h" | 11 #include "third_party/skia/include/core/SkBitmap.h" |
| 12 #include "third_party/skia/include/core/SkUnPreMultiply.h" | 12 #include "third_party/skia/include/core/SkUnPreMultiply.h" |
| 13 | 13 |
| 14 namespace libgtk2ui { | 14 namespace libgtk2ui { |
| 15 | 15 |
| 16 const int kSkiaToGDKMultiplier = 257; | |
| 17 | |
| 18 // GDK_COLOR_RGB multiplies by 257 (= 0x10001) to distribute the bits evenly | 16 // GDK_COLOR_RGB multiplies by 257 (= 0x10001) to distribute the bits evenly |
| 19 // See: http://www.mindcontrol.org/~hplus/graphics/expand-bits.html | 17 // See: http://www.mindcontrol.org/~hplus/graphics/expand-bits.html |
| 20 // To get back, we can just right shift by eight | 18 // To get back, we can just right shift by eight |
| 21 // (or, formulated differently, i == (i*257)/256 for all i < 256). | 19 // (or, formulated differently, i == (i*257)/256 for all i < 256). |
| 22 | 20 |
| 23 SkColor GdkColorToSkColor(GdkColor color) { | 21 SkColor GdkColorToSkColor(GdkColor color) { |
| 24 return SkColorSetRGB(color.red >> 8, color.green >> 8, color.blue >> 8); | 22 return SkColorSetRGB(color.red >> 8, color.green >> 8, color.blue >> 8); |
| 25 } | 23 } |
| 26 | 24 |
| 27 GdkColor SkColorToGdkColor(SkColor color) { | 25 GdkColor SkColorToGdkColor(SkColor color) { |
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| 128 divided[i + 3] = alpha; | 126 divided[i + 3] = alpha; |
| 129 } | 127 } |
| 130 i += kBytesPerPixel; | 128 i += kBytesPerPixel; |
| 131 } | 129 } |
| 132 } | 130 } |
| 133 | 131 |
| 134 return pixbuf; | 132 return pixbuf; |
| 135 } | 133 } |
| 136 | 134 |
| 137 } // namespace libgtk2ui | 135 } // namespace libgtk2ui |
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