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    virtual size_t contextSize() const SK_OVERRIDE {
23        return fProxyShader->contextSize();
24    }
25
26    virtual BitmapType asABitmap(SkBitmap* bitmap, SkMatrix* matrix,
27                                 TileMode* mode) const SK_OVERRIDE {
28        return fProxyShader->asABitmap(bitmap, matrix, mode);
29    }
30
31    virtual GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE {
32        return fProxyShader->asAGradient(info);
33    }
34
35#if SK_SUPPORT_GPU
36
37    virtual bool asNewEffect(GrContext* context, const SkPaint& paint, const SkMatrix* localMatrix,
38                             GrColor* grColor, GrEffectRef** grEffect) const SK_OVERRIDE {
39        SkMatrix tmp = this->getLocalMatrix();
40        if (localMatrix) {
41            tmp.preConcat(*localMatrix);
42        }
43        return fProxyShader->asNewEffect(context, paint, &tmp, grColor, grEffect);
44    }
45
46#else
47
48    virtual bool asNewEffect(GrContext* context, const SkPaint& paint, const SkMatrix* localMatrix,
49                             GrColor* grColor, GrEffectRef** grEffect) const SK_OVERRIDE {
50        SkDEBUGFAIL("Should not call in GPU-less build");
51        return false;
52    }
53
54#endif
55
56    virtual SkShader* refAsALocalMatrixShader(SkMatrix* localMatrix) const SK_OVERRIDE {
57        if (localMatrix) {
58            *localMatrix = this->getLocalMatrix();
59        }
60        return SkRef(fProxyShader.get());
61    }
62
63    SK_TO_STRING_OVERRIDE()
64    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLocalMatrixShader)
65
66protected:
67    SkLocalMatrixShader(SkReadBuffer&);
68    virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
69    virtual Context* onCreateContext(const ContextRec&, void*) const SK_OVERRIDE;
70
71private:
72    SkAutoTUnref<SkShader> fProxyShader;
73
74    typedef SkShader INHERITED;
75};
76
77#endif
78