SkLocalMatrixShader.h revision 9cc1775e7230579ad15345bdcb59fa517c17f870 
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, GrProcessorDataManager* procDataManager,
40                                     GrFragmentProcessor** fp) const override {
41        SkMatrix tmp = this->getLocalMatrix();
42        if (localMatrix) {
43            tmp.preConcat(*localMatrix);
44        }
45        return fProxyShader->asFragmentProcessor(context, paint, viewM, &tmp, grColor,
46                                                 procDataManager, fp);
47    }
48
49#else
50
51    virtual bool asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix&,
52                                     const SkMatrix*, GrColor*, GrProcessorDataManager*,
53                                     GrFragmentProcessor**) const override {
54        SkDEBUGFAIL("Should not call in GPU-less build");
55        return false;
56    }
57
58#endif
59
60    SkShader* refAsALocalMatrixShader(SkMatrix* localMatrix) const override {
61        if (localMatrix) {
62            *localMatrix = this->getLocalMatrix();
63        }
64        return SkRef(fProxyShader.get());
65    }
66
67    SK_TO_STRING_OVERRIDE()
68    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLocalMatrixShader)
69
70protected:
71    void flatten(SkWriteBuffer&) const override;
72    Context* onCreateContext(const ContextRec&, void*) const override;
73
74private:
75    SkAutoTUnref<SkShader> fProxyShader;
76
77    typedef SkShader INHERITED;
78};
79
80#endif
81