SkLayerDrawLooper.h revision ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976e
1ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com 2ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com/* 3ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com * Copyright 2011 Google Inc. 4ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com * 5ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com * Use of this source code is governed by a BSD-style license that can be 6ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com * found in the LICENSE file. 7ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com */ 88a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#ifndef SkLayerDrawLooper_DEFINED 98a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#define SkLayerDrawLooper_DEFINED 108a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 118a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkDrawLooper.h" 120716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com#include "SkXfermode.h" 138a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 148a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.comstruct SkPoint; 158a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 168c3ff17e2cab6f7c798b9f8ff4515c4a3d3fd9d1bsalomon@google.comclass SK_API SkLayerDrawLooper : public SkDrawLooper { 178a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.compublic: 188a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com SkLayerDrawLooper(); 198a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com virtual ~SkLayerDrawLooper(); 200e2810be95d3f1aa95c341521d3f514eb9e9ebdemike@reedtribe.org 210716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com /** 220716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * Bits specifies which aspects of the layer's paint should replace the 230716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * corresponding aspects on the draw's paint. 240716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * kEntirePaint_Bits means use the layer's paint completely. 250716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * 0 means ignore the layer's paint. 260716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com */ 270e2810be95d3f1aa95c341521d3f514eb9e9ebdemike@reedtribe.org enum Bits { 280716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com kStyle_Bit = 1 << 0, //!< use this layer's Style/stroke settings 290716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com kTextSkewX_Bit = 1 << 1, //!< use this layer's textskewx 300716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com kPathEffect_Bit = 1 << 2, //!< use this layer's patheffect 310716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com kMaskFilter_Bit = 1 << 3, //!< use this layer's maskfilter 320716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com kShader_Bit = 1 << 4, //!< use this layer's shader 330716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com kColorFilter_Bit = 1 << 5, //!< use this layer's colorfilter 340716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com kXfermode_Bit = 1 << 6, //!< use this layer's xfermode 350e2810be95d3f1aa95c341521d3f514eb9e9ebdemike@reedtribe.org 360e2810be95d3f1aa95c341521d3f514eb9e9ebdemike@reedtribe.org kEntirePaint_Bits = -1, //!< use this layer's paint entirely 370e2810be95d3f1aa95c341521d3f514eb9e9ebdemike@reedtribe.org }; 380e2810be95d3f1aa95c341521d3f514eb9e9ebdemike@reedtribe.org typedef int32_t BitFlags; 390716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com 400716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com /** 410716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * Info for how to apply the layer's paint and offset. 420716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * 43a8282ef8f9e63e60c5665af0cdfc8fdd11c089f6mike@reedtribe.org * fFlagsMask selects which flags in the layer's paint should be applied. 44a8282ef8f9e63e60c5665af0cdfc8fdd11c089f6mike@reedtribe.org * result = (draw-flags & ~fFlagsMask) | (layer-flags & fFlagsMask) 45a8282ef8f9e63e60c5665af0cdfc8fdd11c089f6mike@reedtribe.org * In the extreme: 46a8282ef8f9e63e60c5665af0cdfc8fdd11c089f6mike@reedtribe.org * If fFlagsMask is 0, we ignore all of the layer's flags 47a8282ef8f9e63e60c5665af0cdfc8fdd11c089f6mike@reedtribe.org * If fFlagsMask is -1, we use all of the layer's flags 48a8282ef8f9e63e60c5665af0cdfc8fdd11c089f6mike@reedtribe.org * 490716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * fColorMode controls how we compute the final color for the layer: 500716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * The layer's paint's color is treated as the SRC 510716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * The draw's paint's color is treated as the DST 520716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * final-color = Mode(layers-color, draws-color); 530716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * Any SkXfermode::Mode will work. Two common choices are: 540716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * kSrc_Mode: to use the layer's color, ignoring the draw's 550716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * kDst_Mode: to just keep the draw's color, ignoring the layer's 560716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com */ 578c3ff17e2cab6f7c798b9f8ff4515c4a3d3fd9d1bsalomon@google.com struct SK_API LayerInfo { 58a8282ef8f9e63e60c5665af0cdfc8fdd11c089f6mike@reedtribe.org uint32_t fFlagsMask; // SkPaint::Flags 590716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com BitFlags fPaintBits; 600716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com SkXfermode::Mode fColorMode; 610716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com SkVector fOffset; 620716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com bool fPostTranslate; //!< applies to fOffset 630716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com 640716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com /** 650716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * Initial the LayerInfo. Defaults to settings that will draw the 660716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * layer with no changes: e.g. 670716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * fPaintBits == 0 680716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * fColorMode == kDst_Mode 690716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com * fOffset == (0, 0) 700716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com */ 710716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com LayerInfo(); 720716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com }; 730716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com 740e2810be95d3f1aa95c341521d3f514eb9e9ebdemike@reedtribe.org /** 750e2810be95d3f1aa95c341521d3f514eb9e9ebdemike@reedtribe.org * Call for each layer you want to add (from top to bottom). 760e2810be95d3f1aa95c341521d3f514eb9e9ebdemike@reedtribe.org * This returns a paint you can modify, but that ptr is only valid until 77a8282ef8f9e63e60c5665af0cdfc8fdd11c089f6mike@reedtribe.org * the next call made to addLayer(). 780716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com */ 790716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com SkPaint* addLayer(const LayerInfo&); 800716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com 810716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com /** 82a8282ef8f9e63e60c5665af0cdfc8fdd11c089f6mike@reedtribe.org * This layer will draw with the original paint, ad the specified offset 838a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com */ 84a8282ef8f9e63e60c5665af0cdfc8fdd11c089f6mike@reedtribe.org void addLayer(SkScalar dx, SkScalar dy); 858a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 860e2810be95d3f1aa95c341521d3f514eb9e9ebdemike@reedtribe.org /** 87a8282ef8f9e63e60c5665af0cdfc8fdd11c089f6mike@reedtribe.org * This layer will with the original paint and no offset. 888a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com */ 89a8282ef8f9e63e60c5665af0cdfc8fdd11c089f6mike@reedtribe.org void addLayer() { this->addLayer(0, 0); } 908a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 918a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com // overrides from SkDrawLooper 924e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com virtual void init(SkCanvas*); 934e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com virtual bool next(SkCanvas*, SkPaint* paint); 948a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 958a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com // must be public for Registrar :( 968a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { 978a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com return SkNEW_ARGS(SkLayerDrawLooper, (buffer)); 988a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 998a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 1008a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.comprotected: 1018a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com SkLayerDrawLooper(SkFlattenableReadBuffer&); 1028a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 1038a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com // overrides from SkFlattenable 1048a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com virtual void flatten(SkFlattenableWriteBuffer& ); 1058a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com virtual Factory getFactory() { return CreateProc; } 1068a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 1078a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.comprivate: 1088a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com struct Rec { 1098a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com Rec* fNext; 1108a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com SkPaint fPaint; 1110716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com LayerInfo fInfo; 1120716c63332a64c3cc77a9afb87ae2fd9614f0c4freed@google.com 1138a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com static Rec* Reverse(Rec*); 1148a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com }; 1158a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com Rec* fRecs; 1168a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com int fCount; 1174e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com 1184e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com // state-machine during the init/next cycle 1194e2b3d3fb1288c6dc0f3ea1c0aa4a0d7c603bd7breed@google.com Rec* fCurrRec; 1200e2810be95d3f1aa95c341521d3f514eb9e9ebdemike@reedtribe.org 121a8282ef8f9e63e60c5665af0cdfc8fdd11c089f6mike@reedtribe.org static void ApplyInfo(SkPaint* dst, const SkPaint& src, const LayerInfo&); 1220e2810be95d3f1aa95c341521d3f514eb9e9ebdemike@reedtribe.org 1238a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com class MyRegistrar : public SkFlattenable::Registrar { 1248a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com public: 1258a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com MyRegistrar(); 1268a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com }; 1278a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 1288a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com typedef SkDrawLooper INHERITED; 1298a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com}; 1308a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 1318a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 1328a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#endif 133