gfx/skia/trunk/include/effects/SkPorterDuff.h@6474c204b198 (annotated)
gfx/skia/trunk/include/effects/SkPorterDuff.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright 2006 The Android Open Source Project |
| michael@0 | 3 | * |
| michael@0 | 4 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 5 | * found in the LICENSE file. |
| michael@0 | 6 | */ |
| michael@0 | 7 | |
| michael@0 | 8 | #ifndef SkPorterDuff_DEFINED |
| michael@0 | 9 | #define SkPorterDuff_DEFINED |
| michael@0 | 10 | |
| michael@0 | 11 | #include "SkColor.h" |
| michael@0 | 12 | #include "SkXfermode.h" |
| michael@0 | 13 | |
| michael@0 | 14 | class SkXfermode; |
| michael@0 | 15 | |
| michael@0 | 16 | class SK_API SkPorterDuff { |
| michael@0 | 17 | public: |
| michael@0 | 18 | /** List of predefined xfermodes. In general, the algebra for the modes |
| michael@0 | 19 | uses the following symbols: |
| michael@0 | 20 | Sa, Sc - source alpha and color |
| michael@0 | 21 | Da, Dc - destination alpha and color (before compositing) |
| michael@0 | 22 | [a, c] - Resulting (alpha, color) values |
| michael@0 | 23 | For these equations, the colors are in premultiplied state. |
| michael@0 | 24 | If no xfermode is specified, kSrcOver is assumed. |
| michael@0 | 25 | */ |
| michael@0 | 26 | enum Mode { |
| michael@0 | 27 | kClear_Mode, //!< [0, 0] |
| michael@0 | 28 | kSrc_Mode, //!< [Sa, Sc] |
| michael@0 | 29 | kDst_Mode, //!< [Da, Dc] |
| michael@0 | 30 | kSrcOver_Mode, //!< [Sa + Da - Sa*Da, Rc = Sc + (1 - Sa)*Dc] |
| michael@0 | 31 | kDstOver_Mode, //!< [Sa + Da - Sa*Da, Rc = Dc + (1 - Da)*Sc] |
| michael@0 | 32 | kSrcIn_Mode, //!< [Sa * Da, Sc * Da] |
| michael@0 | 33 | kDstIn_Mode, //!< [Sa * Da, Sa * Dc] |
| michael@0 | 34 | kSrcOut_Mode, //!< [Sa * (1 - Da), Sc * (1 - Da)] |
| michael@0 | 35 | kDstOut_Mode, //!< [Da * (1 - Sa), Dc * (1 - Sa)] |
| michael@0 | 36 | kSrcATop_Mode, //!< [Da, Sc * Da + (1 - Sa) * Dc] |
| michael@0 | 37 | kDstATop_Mode, //!< [Sa, Sa * Dc + Sc * (1 - Da)] |
| michael@0 | 38 | kXor_Mode, //!< [Sa + Da - 2 * Sa * Da, Sc * (1 - Da) + (1 - Sa) * Dc] |
| michael@0 | 39 | kDarken_Mode, //!< [Sa + Da - Sa*Da, Sc*(1 - Da) + Dc*(1 - Sa) + min(Sc, Dc)] |
| michael@0 | 40 | kLighten_Mode, //!< [Sa + Da - Sa*Da, Sc*(1 - Da) + Dc*(1 - Sa) + max(Sc, Dc)] |
| michael@0 | 41 | kModulate_Mode, //!< [Sa * Da, Sc * Dc] multiplies all components |
| michael@0 | 42 | kScreen_Mode, //!< [Sa + Da - Sa * Da, Sc + Dc - Sc * Dc] |
| michael@0 | 43 | kAdd_Mode, //!< Saturate(S + D) |
| michael@0 | 44 | #ifdef SK_BUILD_FOR_ANDROID |
| michael@0 | 45 | kOverlay_Mode, |
| michael@0 | 46 | #endif |
| michael@0 | 47 | |
| michael@0 | 48 | kModeCount |
| michael@0 | 49 | }; |
| michael@0 | 50 | |
| michael@0 | 51 | /** Return an SkXfermode object for the specified mode. |
| michael@0 | 52 | */ |
| michael@0 | 53 | static SkXfermode* CreateXfermode(Mode mode); |
| michael@0 | 54 | |
| michael@0 | 55 | /** Return a function pointer to a routine that applies the specified |
| michael@0 | 56 | porter-duff transfer mode. |
| michael@0 | 57 | */ |
| michael@0 | 58 | static SkXfermodeProc GetXfermodeProc(Mode mode); |
| michael@0 | 59 | |
| michael@0 | 60 | /** Return a function pointer to a routine that applies the specified |
| michael@0 | 61 | porter-duff transfer mode and srcColor to a 16bit device color. Note, |
| michael@0 | 62 | if the mode+srcColor might return a non-opaque color, then there is not |
| michael@0 | 63 | 16bit proc, and this will return NULL. |
| michael@0 | 64 | */ |
| michael@0 | 65 | static SkXfermodeProc16 GetXfermodeProc16(Mode mode, SkColor srcColor); |
| michael@0 | 66 | |
| michael@0 | 67 | /** If the specified xfermode advertises itself as one of the porterduff |
| michael@0 | 68 | modes (via SkXfermode::Coeff), return true and if not null, set mode |
| michael@0 | 69 | to the corresponding porterduff mode. If it is not recognized as a one, |
| michael@0 | 70 | return false and ignore the mode parameter. |
| michael@0 | 71 | */ |
| michael@0 | 72 | static bool IsMode(SkXfermode*, Mode* mode); |
| michael@0 | 73 | |
| michael@0 | 74 | /** Return the corersponding SkXfermode::Mode |
| michael@0 | 75 | */ |
| michael@0 | 76 | static SkXfermode::Mode ToXfermodeMode(Mode); |
| michael@0 | 77 | } SK_ATTR_DEPRECATED("use SkXfermode::Mode"); |
| michael@0 | 78 | |
| michael@0 | 79 | #endif |
