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