1 /*
2  * Copyright 2006 The Android Open Source Project
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 SkTransparentShader_DEFINED
9 #define SkTransparentShader_DEFINED
10 
11 #include "SkShader.h"
12 
13 class SK_API SkTransparentShader : public SkShader {
14 public:
SkTransparentShader()15     SkTransparentShader() {}
16 
17     size_t contextSize() const override;
18 
19     class TransparentShaderContext : public SkShader::Context {
20     public:
21         TransparentShaderContext(const SkTransparentShader& shader, const ContextRec&);
22         virtual ~TransparentShaderContext();
23 
24         uint32_t getFlags() const override;
25         void shadeSpan(int x, int y, SkPMColor[], int count) override;
26         void shadeSpan16(int x, int y, uint16_t span[], int count) override;
27 
28     private:
29         const SkBitmap* fDevice;
30 
31         typedef SkShader::Context INHERITED;
32     };
33 
34     SK_TO_STRING_OVERRIDE()
35     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTransparentShader)
36 
37 protected:
38     Context* onCreateContext(const ContextRec&, void* storage) const override;
39 
40     // we don't need to flatten anything at all
flatten(SkWriteBuffer &)41     void flatten(SkWriteBuffer&) const override {}
42 
43 private:
44     typedef SkShader INHERITED;
45 };
46 
47 #endif
48