1 /*
2  * Copyright 2015 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #ifndef SkXfermode_proccoeff_DEFINED
9 #define SkXfermode_proccoeff_DEFINED
10 
11 #include "SkXfermode.h"
12 #include "SkReadBuffer.h"
13 #include "SkWriteBuffer.h"
14 
15 struct ProcCoeff {
16     SkXfermodeProc      fProc;
17     SkXfermodeProc4f    fProc4f;
18     SkXfermode::Coeff   fSC;
19     SkXfermode::Coeff   fDC;
20 };
21 
22 #define CANNOT_USE_COEFF    SkXfermode::Coeff(-1)
23 
24 class SK_API SkProcCoeffXfermode : public SkXfermode {
25 public:
SkProcCoeffXfermode(const ProcCoeff & rec,Mode mode)26     SkProcCoeffXfermode(const ProcCoeff& rec, Mode mode) {
27         fMode = mode;
28         fProc = rec.fProc;
29         // these may be valid, or may be CANNOT_USE_COEFF
30         fSrcCoeff = rec.fSC;
31         fDstCoeff = rec.fDC;
32     }
33 
34     void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
35                 const SkAlpha aa[]) const override;
36     void xfer16(uint16_t dst[], const SkPMColor src[], int count,
37                 const SkAlpha aa[]) const override;
38     void xferA8(SkAlpha dst[], const SkPMColor src[], int count,
39                 const SkAlpha aa[]) const override;
40 
41     bool asMode(Mode* mode) const override;
42 
43     bool supportsCoverageAsAlpha() const override;
44 
45     bool isOpaque(SkXfermode::SrcColorOpacity opacityType) const override;
46 
47 #if SK_SUPPORT_GPU
48     sk_sp<GrFragmentProcessor> makeFragmentProcessorForImageFilter(
49                                                         sk_sp<GrFragmentProcessor>) const override;
50     sk_sp<GrXPFactory> asXPFactory() const override;
51 #endif
52 
53     SK_TO_STRING_OVERRIDE()
54     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkProcCoeffXfermode)
55 
56     bool onAppendStages(SkRasterPipeline*) const override;
57 
58 protected:
59     void flatten(SkWriteBuffer& buffer) const override;
60 
getMode()61     Mode getMode() const { return fMode; }
62 
getProc()63     SkXfermodeProc getProc() const { return fProc; }
64 
65 private:
66     SkXfermodeProc  fProc;
67     Mode            fMode;
68     Coeff           fSrcCoeff, fDstCoeff;
69 
70     friend class SkXfermode;
71 
72     typedef SkXfermode INHERITED;
73 };
74 
75 #endif // #ifndef SkXfermode_proccoeff_DEFINED
76