572a865846
git-svn-id: http://skia.googlecode.com/svn/trunk@11426 2bbb7eff-a529-9590-31e7-b0007b416f81
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkAlpha_DEFINED
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#define SkAlpha_DEFINED
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#include "SkTypes.h"
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/**
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* Describes how to interpret the alpha compoent of a pixel.
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*/
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enum SkAlphaType {
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/**
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* All pixels should be treated as opaque, regardless of the value stored
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* in their alpha field. Used for legacy images that wrote 0 or garbarge
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* in their alpha field, but intended the RGB to be treated as opaque.
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*/
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kIgnore_SkAlphaType,
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/**
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* All pixels are stored as opaque. This differs slightly from kIgnore in
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* that kOpaque has correct "opaque" values stored in the pixels, while
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* kIgnore may not, but in both cases the caller should treat the pixels
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* as opaque.
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*/
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kOpaque_SkAlphaType,
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/**
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* All pixels have their alpha premultiplied in their color components.
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* This is the natural format for the rendering target pixels.
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*/
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kPremul_SkAlphaType,
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/**
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* All pixels have their color components stored without any regard to the
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* alpha. e.g. this is the default configuration for PNG images.
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*
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* This alpha-type is ONLY supported for input images. Rendering cannot
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* generate this on output.
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*/
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kUnpremul_SkAlphaType,
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kLastEnum_SkAlphaType = kUnpremul_SkAlphaType
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};
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#endif
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