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comparison: gfx/skia/trunk/include/effects/SkArithmeticMode.h
gfx/skia/trunk/include/effects/SkArithmeticMode.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:b3f1767a287e |
|---|---|
| 1 /* | |
| 2 * Copyright 2011 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 SkArithmeticMode_DEFINED | |
| 9 #define SkArithmeticMode_DEFINED | |
| 10 | |
| 11 #include "SkFlattenable.h" | |
| 12 #include "SkScalar.h" | |
| 13 | |
| 14 class SkXfermode; | |
| 15 | |
| 16 class SK_API SkArithmeticMode { | |
| 17 public: | |
| 18 /** | |
| 19 * result = clamp[k1 * src * dst + k2 * src + k3 * dst + k4] | |
| 20 * | |
| 21 * src and dst are treated as being [0.0 .. 1.0]. The polynomial is | |
| 22 * evaluated on their unpremultiplied components. | |
| 23 * | |
| 24 * k1=k2=k3=0, k4=1.0 results in returning opaque white | |
| 25 * k1=k3=k4=0, k2=1.0 results in returning the src | |
| 26 * k1=k2=k4=0, k3=1.0 results in returning the dst | |
| 27 */ | |
| 28 static SkXfermode* Create(SkScalar k1, SkScalar k2, | |
| 29 SkScalar k3, SkScalar k4); | |
| 30 | |
| 31 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP(); | |
| 32 | |
| 33 private: | |
| 34 SkArithmeticMode(); // can't be instantiated | |
| 35 }; | |
| 36 | |
| 37 #endif |
