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| 1 /* |
| 2 * Copyright 2013 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #ifndef SkAlpha_DEFINED |
| 9 #define SkAlpha_DEFINED |
| 10 |
| 11 #include "SkTypes.h" |
| 12 |
| 13 /** |
| 14 * Describes how to interpret the alpha compoent of a pixel. |
| 15 */ |
| 16 enum SkAlphaType { |
| 17 /** |
| 18 * All pixels should be treated as opaque, regardless of the value stored |
| 19 * in their alpha field. Used for legacy images that wrote 0 or garbarge |
| 20 * in their alpha field, but intended the RGB to be treated as opaque. |
| 21 */ |
| 22 kIgnore_SkAlphaType, |
| 23 |
| 24 /** |
| 25 * All pixels are stored as opaque. This differs slightly from kIgnore in |
| 26 * that kOpaque has correct "opaque" values stored in the pixels, while |
| 27 * kIgnore may not, but in both cases the caller should treat the pixels |
| 28 * as opaque. |
| 29 */ |
| 30 kOpaque_SkAlphaType, |
| 31 |
| 32 /** |
| 33 * All pixels have their alpha premultiplied in their color components. |
| 34 * This is the natural format for the rendering target pixels. |
| 35 */ |
| 36 kPremul_SkAlphaType, |
| 37 |
| 38 /** |
| 39 * All pixels have their color components stored without any regard to the |
| 40 * alpha. e.g. this is the default configuration for PNG images. |
| 41 * |
| 42 * This alpha-type is ONLY supported for input images. Rendering cannot |
| 43 * generate this on output. |
| 44 */ |
| 45 kUnpremul_SkAlphaType, |
| 46 |
| 47 kLastEnum_SkAlphaType = kUnpremul_SkAlphaType |
| 48 }; |
| 49 |
| 50 #endif |
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