From 048522dd2aa45d1b4bf52944527f877b30ea45fd Mon Sep 17 00:00:00 2001 From: "reed@android.com" Date: Tue, 23 Jun 2009 12:19:41 +0000 Subject: remove remaining references to porterduff git-svn-id: http://skia.googlecode.com/svn/trunk@236 2bbb7eff-a529-9590-31e7-b0007b416f81 --- include/effects/SkPorterDuff.h | 88 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) create mode 100644 include/effects/SkPorterDuff.h (limited to 'include/effects') diff --git a/include/effects/SkPorterDuff.h b/include/effects/SkPorterDuff.h new file mode 100644 index 0000000000..6f4ac20be3 --- /dev/null +++ b/include/effects/SkPorterDuff.h @@ -0,0 +1,88 @@ +/* + * Copyright (C) 2006 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef SkPorterDuff_DEFINED +#define SkPorterDuff_DEFINED + +#include "SkColor.h" +#include "SkXfermode.h" + +class SkXfermode; + +/** DEPRECATED - use SkXfermode::Mode instead + */ +class SkPorterDuff { +public: + /** List of predefined xfermodes. In general, the algebra for the modes + uses the following symbols: + Sa, Sc - source alpha and color + Da, Dc - destination alpha and color (before compositing) + [a, c] - Resulting (alpha, color) values + For these equations, the colors are in premultiplied state. + If no xfermode is specified, kSrcOver is assumed. + */ + enum Mode { + kClear_Mode, //!< [0, 0] + kSrc_Mode, //!< [Sa, Sc] + kDst_Mode, //!< [Da, Dc] + kSrcOver_Mode, //!< [Sa + Da - Sa*Da, Rc = Sc + (1 - Sa)*Dc] + kDstOver_Mode, //!< [Sa + Da - Sa*Da, Rc = Dc + (1 - Da)*Sc] + kSrcIn_Mode, //!< [Sa * Da, Sc * Da] + kDstIn_Mode, //!< [Sa * Da, Sa * Dc] + kSrcOut_Mode, //!< [Sa * (1 - Da), Sc * (1 - Da)] + kDstOut_Mode, //!< [Da * (1 - Sa), Dc * (1 - Sa)] + kSrcATop_Mode, //!< [Da, Sc * Da + (1 - Sa) * Dc] + kDstATop_Mode, //!< [Sa, Sa * Dc + Sc * (1 - Da)] + kXor_Mode, //!< [Sa + Da - 2 * Sa * Da, Sc * (1 - Da) + (1 - Sa) * Dc] + kDarken_Mode, //!< [Sa + Da - Sa*Da, Sc*(1 - Da) + Dc*(1 - Sa) + min(Sc, Dc)] + kLighten_Mode, //!< [Sa + Da - Sa*Da, Sc*(1 - Da) + Dc*(1 - Sa) + max(Sc, Dc)] + kMultiply_Mode, //!< [Sa * Da, Sc * Dc] + kScreen_Mode, //!< [Sa + Da - Sa * Da, Sc + Dc - Sc * Dc] + kAdd_Mode, //!< Saturate(S + D) + + kModeCount + }; + + /** Return an SkXfermode object for the specified mode. + */ + static SkXfermode* CreateXfermode(Mode mode); + + /** Return a function pointer to a routine that applies the specified + porter-duff transfer mode. + */ + static SkXfermodeProc GetXfermodeProc(Mode mode); + + /** Return a function pointer to a routine that applies the specified + porter-duff transfer mode and srcColor to a 16bit device color. Note, + if the mode+srcColor might return a non-opaque color, then there is not + 16bit proc, and this will return NULL. + */ + static SkXfermodeProc16 GetXfermodeProc16(Mode mode, SkColor srcColor); + + /** If the specified xfermode advertises itself as one of the porterduff + modes (via SkXfermode::Coeff), return true and if not null, set mode + to the corresponding porterduff mode. If it is not recognized as a one, + return false and ignore the mode parameter. + */ + static bool IsMode(SkXfermode*, Mode* mode); + + /** Return the corersponding SkXfermode::Mode + */ + static SkXfermode::Mode ToXfermodeMode(Mode); +}; + +#endif + -- cgit v1.2.3