1 /*
2  * Copyright 2016 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 SkBlendModePriv_DEFINED
9 #define SkBlendModePriv_DEFINED
10 
11 #include "SkBlendMode.h"
12 #include "SkPM4f.h"
13 
14 class SkRasterPipeline;
15 
16 bool SkBlendMode_SupportsCoverageAsAlpha(SkBlendMode);
17 
18 static inline bool SkBlendMode_CaresAboutRBOrder(SkBlendMode mode) {
19     return (mode > SkBlendMode::kLastSeparableMode);
20 }
21 
22 bool SkBlendMode_ShouldPreScaleCoverage(SkBlendMode, bool rgb_coverage);
23 void SkBlendMode_AppendStages(SkBlendMode, SkRasterPipeline*);
24 
25 enum class SkBlendModeCoeff {
26     kZero, /** 0 */
27     kOne,  /** 1 */
28     kSC,   /** src color */
29     kISC,  /** inverse src color (i.e. 1 - sc) */
30     kDC,   /** dst color */
31     kIDC,  /** inverse dst color (i.e. 1 - dc) */
32     kSA,   /** src alpha */
33     kISA,  /** inverse src alpha (i.e. 1 - sa) */
34     kDA,   /** dst alpha */
35     kIDA,  /** inverse dst alpha (i.e. 1 - da) */
36 
37     kCoeffCount
38 };
39 
40 bool SkBlendMode_AsCoeff(SkBlendMode mode, SkBlendModeCoeff* src, SkBlendModeCoeff* dst);
41 
42 SkPM4f SkBlendMode_Apply(SkBlendMode, const SkPM4f& src, const SkPM4f& dst);
43 
44 #if SK_SUPPORT_GPU
45 #include "GrXferProcessor.h"
46 const GrXPFactory* SkBlendMode_AsXPFactory(SkBlendMode);
47 #endif
48 
49 #endif
50