1 :
2 : /*
3 : * Copyright 2011 Google Inc.
4 : *
5 : * Use of this source code is governed by a BSD-style license that can be
6 : * found in the LICENSE file.
7 : */
8 :
9 :
10 :
11 : #ifndef SkEmptyShader_DEFINED
12 : #define SkEmptyShader_DEFINED
13 :
14 : #include "SkShader.h"
15 :
16 : /**
17 : * \class SkEmptyShader
18 : * A Shader that always draws nothing. Its setContext always returns false,
19 : * so it never expects that its shadeSpan() methods will get called.
20 : */
21 0 : class SK_API SkEmptyShader : public SkShader {
22 : public:
23 0 : SkEmptyShader() {}
24 :
25 : virtual uint32_t getFlags() SK_OVERRIDE;
26 : virtual uint8_t getSpan16Alpha() const SK_OVERRIDE;
27 : virtual bool setContext(const SkBitmap&, const SkPaint&,
28 : const SkMatrix&) SK_OVERRIDE;
29 : virtual void shadeSpan(int x, int y, SkPMColor span[], int count) SK_OVERRIDE;
30 : virtual void shadeSpan16(int x, int y, uint16_t span[], int count) SK_OVERRIDE;
31 : virtual void shadeSpanAlpha(int x, int y, uint8_t alpha[], int count) SK_OVERRIDE;
32 :
33 : protected:
34 : SkEmptyShader(SkFlattenableReadBuffer&);
35 :
36 : virtual Factory getFactory() SK_OVERRIDE;
37 : virtual void flatten(SkFlattenableWriteBuffer&) SK_OVERRIDE;
38 :
39 : private:
40 : typedef SkShader INHERITED;
41 : };
42 :
43 : #endif
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