79a7542081
- reverse sense of Blend mixer to be (dst, src, mode) - change pipeline register convention to be (dst, src) Bug: skia: Change-Id: I1f1d990001ad941cb8d44e1488c5f14077e181f8 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201386 Commit-Queue: Mike Reed <reed@google.com> Reviewed-by: Mike Klein <mtklein@google.com>
74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
/*
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* Copyright 2019 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 SkMixer_DEFINED
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#define SkMixer_DEFINED
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#include "SkBlendMode.h"
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#include "SkColor.h"
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#include "SkFlattenable.h"
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class SkShader;
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/**
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* A Mixer takes two input colors (A and B) and returns a new color (C)
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* C = mix(A, B)
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*
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* Mixers can be used to combine multiple other effect objects: shaders, colorfilters, imagefilters
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*/
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class SK_API SkMixer : public SkFlattenable {
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public:
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/**
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* Returns the first color
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*/
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static sk_sp<SkMixer> MakeFirst();
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/**
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* Returns the second color
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*/
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static sk_sp<SkMixer> MakeSecond();
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/**
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* Returns the specified color, ignoring the input colors.
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*/
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static sk_sp<SkMixer> MakeConst(SkColor);
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static sk_sp<SkMixer> MakeConst(const SkColor4f&);
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/**
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* Applies the blendmode, treating the 1st color as DST and the 2nd as SRC
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*
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* C = blendmode(dst, src)
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*/
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static sk_sp<SkMixer> MakeBlend(SkBlendMode);
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/**
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* Returns a lerp of the two inputs:
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* C = A*(1 - t) + B*t
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*/
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static sk_sp<SkMixer> MakeLerp(float t);
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/**
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* Uses the first channel (e.g. Red) of the shader's output as the lerp coefficient.
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*/
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static sk_sp<SkMixer> MakeShaderLerp(sk_sp<SkShader>);
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/**
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* Returns a new mixer that invokes this mixer, but with its arguments reversed.
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* C = this(B, A)
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*/
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sk_sp<SkMixer> makeReverse() const;
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/**
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* Returns a new mixer that forwards its inputs (A, B) to two other mixers, and then calls
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* the original mixer with their results.
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* C = this(ma(A, B), mb(A, B))
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*/
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sk_sp<SkMixer> makeMerge(sk_sp<SkMixer> ma, sk_sp<SkMixer> mb) const;
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};
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#endif
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