SkLocalMatrixShader.h revision 36352bf5e38f45a70ee4f4fc132a38048d38206d 
1/*
2 * Copyright 2014 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 SkLocalMatrixShader_DEFINED
9#define SkLocalMatrixShader_DEFINED
10
11#include "SkShader.h"
12#include "SkReadBuffer.h"
13#include "SkWriteBuffer.h"
14
15class SkLocalMatrixShader : public SkShader {
16public:
17    SkLocalMatrixShader(SkShader* proxy, const SkMatrix& localMatrix)
18    : INHERITED(&localMatrix)
19    , fProxyShader(SkRef(proxy))
20    {}
21
22    size_t contextSize() const override {
23        return fProxyShader->contextSize();
24    }
25
26    virtual BitmapType asABitmap(SkBitmap* bitmap, SkMatrix* matrix,
27                                 TileMode* mode) const override {
28        return fProxyShader->asABitmap(bitmap, matrix, mode);
29    }
30
31    GradientType asAGradient(GradientInfo* info) const override {
32        return fProxyShader->asAGradient(info);
33    }
34
35#if SK_SUPPORT_GPU
36
37    virtual bool asFragmentProcessor(GrContext* context, const SkPaint& paint,
38                                     const SkMatrix& viewM, const SkMatrix* localMatrix,
39                                     GrColor* grColor, GrFragmentProcessor** fp) const override {
40        SkMatrix tmp = this->getLocalMatrix();
41        if (localMatrix) {
42            tmp.preConcat(*localMatrix);
43        }
44        return fProxyShader->asFragmentProcessor(context, paint, viewM, &tmp, grColor, fp);
45    }
46
47#else
48
49    virtual bool asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix&,
50                                     const SkMatrix*, GrColor*,
51                                     GrFragmentProcessor**) const override {
52        SkDEBUGFAIL("Should not call in GPU-less build");
53        return false;
54    }
55
56#endif
57
58    SkShader* refAsALocalMatrixShader(SkMatrix* localMatrix) const override {
59        if (localMatrix) {
60            *localMatrix = this->getLocalMatrix();
61        }
62        return SkRef(fProxyShader.get());
63    }
64
65    SK_TO_STRING_OVERRIDE()
66    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLocalMatrixShader)
67
68protected:
69    void flatten(SkWriteBuffer&) const override;
70    Context* onCreateContext(const ContextRec&, void*) const override;
71
72private:
73    SkAutoTUnref<SkShader> fProxyShader;
74
75    typedef SkShader INHERITED;
76};
77
78#endif
79