SkBlurDrawLooper.cpp revision 74e608cdc1e13593b54d54f11e65c1c309d19370
1c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 2c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)/* 3c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * Copyright 2011 Google Inc. 4c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * 5c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * Use of this source code is governed by a BSD-style license that can be 6c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * found in the LICENSE file. 7c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) */ 8c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "SkBlurDrawLooper.h" 9c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "SkBlurMask.h" // just for SkBlurMask::ConvertRadiusToSigma 105d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "SkBlurMaskFilter.h" 11c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "SkCanvas.h" 12c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "SkColorFilter.h" 13c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "SkReadBuffer.h" 14c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "SkWriteBuffer.h" 15c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "SkMaskFilter.h" 16c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "SkPaint.h" 17c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "SkString.h" 18c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "SkStringUtils.h" 19c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 20c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#ifdef SK_SUPPORT_LEGACY_BLURDRAWLOOPERCONSTRUCTORS 21c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)SkBlurDrawLooper::SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy, 22c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) SkColor color, uint32_t flags) { 23c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) this->init(SkBlurMask::ConvertRadiusToSigma(radius), dx, dy, color, flags); 24c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 25c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#endif 26c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 27c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)SkBlurDrawLooper::SkBlurDrawLooper(SkColor color, SkScalar sigma, 28c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) SkScalar dx, SkScalar dy, uint32_t flags) { 29c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) this->init(sigma, dx, dy, color, flags); 30c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 31c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 32c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)void SkBlurDrawLooper::init(SkScalar sigma, SkScalar dx, SkScalar dy, 33c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) SkColor color, uint32_t flags) { 34c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) fDx = dx; 35c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) fDy = dy; 36c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) fBlurColor = color; 37c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) fBlurFlags = flags; 38c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 39c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) SkASSERT(flags <= kAll_BlurFlag); 40c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (sigma > 0) { 4158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) uint32_t blurFlags = flags & kIgnoreTransform_BlurFlag ? 4258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) SkBlurMaskFilter::kIgnoreTransform_BlurFlag : 4358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) SkBlurMaskFilter::kNone_BlurFlag; 44c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 45c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) blurFlags |= flags & kHighQuality_BlurFlag ? 465d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) SkBlurMaskFilter::kHighQuality_BlurFlag : 47c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) SkBlurMaskFilter::kNone_BlurFlag; 48c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 49c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) fBlur = SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle, 50c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) sigma, 51c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) blurFlags); 521320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci } else { 53c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) fBlur = NULL; 54c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) } 55c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 56c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (flags & kOverrideColor_BlurFlag) { 57c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) // Set alpha to 1 for the override since transparency will already 58c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) // be baked into the blurred mask. 59c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) SkColor opaqueColor = SkColorSetA(color, 255); 60c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) //The SrcIn xfer mode will multiply 'color' by the incoming alpha 615d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) fColorFilter = SkColorFilter::CreateModeFilter(opaqueColor, 62c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) SkXfermode::kSrcIn_Mode); 63c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) } else { 64c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) fColorFilter = NULL; 657d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) } 66c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 67c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 68c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)SkBlurDrawLooper::SkBlurDrawLooper(SkReadBuffer& buffer) 69c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles): INHERITED(buffer) { 70c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 71c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) fDx = buffer.readScalar(); 72010d83a9304c5a91596085d917d248abff47903aTorne (Richard Coles) fDy = buffer.readScalar(); 73c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) fBlurColor = buffer.readColor(); 74c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) fBlur = buffer.readMaskFilter(); 75c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) fColorFilter = buffer.readColorFilter(); 76c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) fBlurFlags = buffer.readUInt() & kAll_BlurFlag; 77c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 78c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 79c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)SkBlurDrawLooper::~SkBlurDrawLooper() { 801320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci SkSafeUnref(fBlur); 811320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci SkSafeUnref(fColorFilter); 821320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci} 831320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci 84c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)void SkBlurDrawLooper::flatten(SkWriteBuffer& buffer) const { 85c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) this->INHERITED::flatten(buffer); 86c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) buffer.writeScalar(fDx); 87c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) buffer.writeScalar(fDy); 88c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) buffer.writeColor(fBlurColor); 89c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) buffer.writeFlattenable(fBlur); 90c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) buffer.writeFlattenable(fColorFilter); 91c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) buffer.writeUInt(fBlurFlags); 92c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 93c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 94c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)SkDrawLooper::Context* SkBlurDrawLooper::createContext(SkCanvas*, void* storage) const { 95c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) return SkNEW_PLACEMENT_ARGS(storage, BlurDrawLooperContext, (this)); 96c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 97a3f7b4e666c476898878fa745f637129375cd889Ben Murdoch 98c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)SkBlurDrawLooper::BlurDrawLooperContext::BlurDrawLooperContext( 99c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) const SkBlurDrawLooper* looper) 10058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) : fLooper(looper), fState(SkBlurDrawLooper::kBeforeEdge) {} 10158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 1027d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)bool SkBlurDrawLooper::BlurDrawLooperContext::next(SkCanvas* canvas, 1037d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) SkPaint* paint) { 1041320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci switch (fState) { 1051320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci case kBeforeEdge: 10658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // we do nothing if a maskfilter is already installed 1070529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch if (paint->getMaskFilter()) { 1080529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch fState = kDone; 1090529e5d033099cbfc42635f6f6183833b09dff6eBen Murdoch return false; 110a3f7b4e666c476898878fa745f637129375cd889Ben Murdoch } 111c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#ifdef SK_BUILD_FOR_ANDROID 112c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) SkColor blurColor; 113c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) blurColor = fLooper->fBlurColor; 114c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (SkColorGetA(blurColor) == 255) { 115c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) blurColor = SkColorSetA(blurColor, paint->getAlpha()); 116c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) } 117 paint->setColor(blurColor); 118#else 119 paint->setColor(fLooper->fBlurColor); 120#endif 121 paint->setMaskFilter(fLooper->fBlur); 122 paint->setColorFilter(fLooper->fColorFilter); 123 canvas->save(); 124 if (fLooper->fBlurFlags & kIgnoreTransform_BlurFlag) { 125 SkMatrix transform(canvas->getTotalMatrix()); 126 transform.postTranslate(fLooper->fDx, fLooper->fDy); 127 canvas->setMatrix(transform); 128 } else { 129 canvas->translate(fLooper->fDx, fLooper->fDy); 130 } 131 fState = kAfterEdge; 132 return true; 133 case kAfterEdge: 134 canvas->restore(); 135 fState = kDone; 136 return true; 137 default: 138 SkASSERT(kDone == fState); 139 return false; 140 } 141} 142 143#ifndef SK_IGNORE_TO_STRING 144void SkBlurDrawLooper::toString(SkString* str) const { 145 str->append("SkBlurDrawLooper: "); 146 147 str->append("dx: "); 148 str->appendScalar(fDx); 149 150 str->append(" dy: "); 151 str->appendScalar(fDy); 152 153 str->append(" color: "); 154 str->appendHex(fBlurColor); 155 156 str->append(" flags: ("); 157 if (kNone_BlurFlag == fBlurFlags) { 158 str->append("None"); 159 } else { 160 bool needsSeparator = false; 161 SkAddFlagToString(str, SkToBool(kIgnoreTransform_BlurFlag & fBlurFlags), "IgnoreTransform", 162 &needsSeparator); 163 SkAddFlagToString(str, SkToBool(kOverrideColor_BlurFlag & fBlurFlags), "OverrideColor", 164 &needsSeparator); 165 SkAddFlagToString(str, SkToBool(kHighQuality_BlurFlag & fBlurFlags), "HighQuality", 166 &needsSeparator); 167 } 168 str->append(")"); 169 170 // TODO: add optional "fBlurFilter->toString(str);" when SkMaskFilter::toString is added 171 // alternatively we could cache the radius in SkBlurDrawLooper and just add it here 172} 173#endif 174