e51755fc64
git-svn-id: http://skia.googlecode.com/svn/trunk@2849 2bbb7eff-a529-9590-31e7-b0007b416f81
31 lines
812 B
C++
31 lines
812 B
C++
/*
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* Copyright 2011 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 SkArithmeticMode_DEFINED
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#define SkArithmeticMode_DEFINED
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#include "SkXfermode.h"
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class SkArithmeticMode : public SkXfermode {
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public:
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/**
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* result = clamp[k1 * src * dst + k2 * src + k3 * dst + k4]
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*
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* src and dst are treated as being [0.0 .. 1.0]. The polynomial is
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* evaluated on their unpremultiplied components.
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*
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* k1=k2=k3=0, k4=1.0 results in returning opaque white
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* k1=k3=k4=0, k2=1.0 results in returning the src
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* k1=k2=k4=0, k3=1.0 results in returning the dst
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*/
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static SkXfermode* Create(SkScalar k1, SkScalar k2,
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SkScalar k3, SkScalar k4);
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};
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#endif
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