SkFilterShader.h revision e901b6de3ef8dea842008a08fc81e92fb1478d61 
1/*
2 * Copyright 2012 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 SkFilterShader_DEFINED
9#define SkFilterShader_DEFINED
10
11#include "SkShader.h"
12
13class SkColorFilter;
14
15class SkFilterShader : public SkShader {
16public:
17    SkFilterShader(SkShader* shader, SkColorFilter* filter);
18    virtual ~SkFilterShader();
19
20    virtual bool validContext(const ContextRec&, SkMatrix* totalInverse) const SK_OVERRIDE;
21    virtual SkShader::Context* createContext(const ContextRec&, void* storage) const SK_OVERRIDE;
22    virtual size_t contextSize() const SK_OVERRIDE;
23
24    class FilterShaderContext : public SkShader::Context {
25    public:
26        // Takes ownership of shaderContext and calls its destructor.
27        FilterShaderContext(const SkFilterShader&, SkShader::Context*, const ContextRec&);
28        virtual ~FilterShaderContext();
29
30        virtual uint32_t getFlags() const SK_OVERRIDE;
31
32        virtual void shadeSpan(int x, int y, SkPMColor[], int count) SK_OVERRIDE;
33        virtual void shadeSpan16(int x, int y, uint16_t[], int count) SK_OVERRIDE;
34
35    private:
36        SkShader::Context* fShaderContext;
37
38        typedef SkShader::Context INHERITED;
39    };
40
41    SK_TO_STRING_OVERRIDE()
42    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkFilterShader)
43
44protected:
45    SkFilterShader(SkReadBuffer& );
46    virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
47
48private:
49    SkShader*       fShader;
50    SkColorFilter*  fFilter;
51
52    typedef SkShader INHERITED;
53};
54
55#endif
56