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comparison: gfx/skia/trunk/include/effects/SkPorterDuff.h
gfx/skia/trunk/include/effects/SkPorterDuff.h
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- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:0c2f100db337 |
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| 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 SkPorterDuff_DEFINED | |
| 9 #define SkPorterDuff_DEFINED | |
| 10 | |
| 11 #include "SkColor.h" | |
| 12 #include "SkXfermode.h" | |
| 13 | |
| 14 class SkXfermode; | |
| 15 | |
| 16 class SK_API SkPorterDuff { | |
| 17 public: | |
| 18 /** List of predefined xfermodes. In general, the algebra for the modes | |
| 19 uses the following symbols: | |
| 20 Sa, Sc - source alpha and color | |
| 21 Da, Dc - destination alpha and color (before compositing) | |
| 22 [a, c] - Resulting (alpha, color) values | |
| 23 For these equations, the colors are in premultiplied state. | |
| 24 If no xfermode is specified, kSrcOver is assumed. | |
| 25 */ | |
| 26 enum Mode { | |
| 27 kClear_Mode, //!< [0, 0] | |
| 28 kSrc_Mode, //!< [Sa, Sc] | |
| 29 kDst_Mode, //!< [Da, Dc] | |
| 30 kSrcOver_Mode, //!< [Sa + Da - Sa*Da, Rc = Sc + (1 - Sa)*Dc] | |
| 31 kDstOver_Mode, //!< [Sa + Da - Sa*Da, Rc = Dc + (1 - Da)*Sc] | |
| 32 kSrcIn_Mode, //!< [Sa * Da, Sc * Da] | |
| 33 kDstIn_Mode, //!< [Sa * Da, Sa * Dc] | |
| 34 kSrcOut_Mode, //!< [Sa * (1 - Da), Sc * (1 - Da)] | |
| 35 kDstOut_Mode, //!< [Da * (1 - Sa), Dc * (1 - Sa)] | |
| 36 kSrcATop_Mode, //!< [Da, Sc * Da + (1 - Sa) * Dc] | |
| 37 kDstATop_Mode, //!< [Sa, Sa * Dc + Sc * (1 - Da)] | |
| 38 kXor_Mode, //!< [Sa + Da - 2 * Sa * Da, Sc * (1 - Da) + (1 - Sa) * Dc] | |
| 39 kDarken_Mode, //!< [Sa + Da - Sa*Da, Sc*(1 - Da) + Dc*(1 - Sa) + min(Sc, Dc)] | |
| 40 kLighten_Mode, //!< [Sa + Da - Sa*Da, Sc*(1 - Da) + Dc*(1 - Sa) + max(Sc, Dc)] | |
| 41 kModulate_Mode, //!< [Sa * Da, Sc * Dc] multiplies all components | |
| 42 kScreen_Mode, //!< [Sa + Da - Sa * Da, Sc + Dc - Sc * Dc] | |
| 43 kAdd_Mode, //!< Saturate(S + D) | |
| 44 #ifdef SK_BUILD_FOR_ANDROID | |
| 45 kOverlay_Mode, | |
| 46 #endif | |
| 47 | |
| 48 kModeCount | |
| 49 }; | |
| 50 | |
| 51 /** Return an SkXfermode object for the specified mode. | |
| 52 */ | |
| 53 static SkXfermode* CreateXfermode(Mode mode); | |
| 54 | |
| 55 /** Return a function pointer to a routine that applies the specified | |
| 56 porter-duff transfer mode. | |
| 57 */ | |
| 58 static SkXfermodeProc GetXfermodeProc(Mode mode); | |
| 59 | |
| 60 /** Return a function pointer to a routine that applies the specified | |
| 61 porter-duff transfer mode and srcColor to a 16bit device color. Note, | |
| 62 if the mode+srcColor might return a non-opaque color, then there is not | |
| 63 16bit proc, and this will return NULL. | |
| 64 */ | |
| 65 static SkXfermodeProc16 GetXfermodeProc16(Mode mode, SkColor srcColor); | |
| 66 | |
| 67 /** If the specified xfermode advertises itself as one of the porterduff | |
| 68 modes (via SkXfermode::Coeff), return true and if not null, set mode | |
| 69 to the corresponding porterduff mode. If it is not recognized as a one, | |
| 70 return false and ignore the mode parameter. | |
| 71 */ | |
| 72 static bool IsMode(SkXfermode*, Mode* mode); | |
| 73 | |
| 74 /** Return the corersponding SkXfermode::Mode | |
| 75 */ | |
| 76 static SkXfermode::Mode ToXfermodeMode(Mode); | |
| 77 } SK_ATTR_DEPRECATED("use SkXfermode::Mode"); | |
| 78 | |
| 79 #endif |
