/*
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* Copyright 2006 The Android Open Source Project
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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 SkXfermodePriv_DEFINED
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#define SkXfermodePriv_DEFINED
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#include "SkBlendMode.h"
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#include "SkColor.h"
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#include "SkRefCnt.h"
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class GrFragmentProcessor;
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class GrTexture;
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class GrXPFactory;
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class SkRasterPipeline;
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class SkString;
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class SkXfermode : public SkRefCnt {
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public:
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virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
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const SkAlpha aa[]) const = 0;
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/** Return an SkXfermode object for the specified mode.
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*/
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static sk_sp<SkXfermode> Make(SkBlendMode);
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/**
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* Skia maintains global xfermode objects corresponding to each BlendMode. This returns a
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* ptr to that global xfermode (or null if the mode is srcover). Thus the caller may use
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* the returned ptr, but it should leave its refcnt untouched.
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*/
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static SkXfermode* Peek(SkBlendMode mode) {
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sk_sp<SkXfermode> xfer = Make(mode);
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if (!xfer) {
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SkASSERT(SkBlendMode::kSrcOver == mode);
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return nullptr;
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}
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SkASSERT(!xfer->unique());
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return xfer.get();
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}
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enum SrcColorOpacity {
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// The src color is known to be opaque (alpha == 255)
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kOpaque_SrcColorOpacity = 0,
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// The src color is known to be fully transparent (color == 0)
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kTransparentBlack_SrcColorOpacity = 1,
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// The src alpha is known to be fully transparent (alpha == 0)
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kTransparentAlpha_SrcColorOpacity = 2,
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// The src color opacity is unknown
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kUnknown_SrcColorOpacity = 3
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};
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static bool IsOpaque(SkBlendMode, SrcColorOpacity);
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protected:
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SkXfermode() {}
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};
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#endif
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