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comparison: gfx/skia/trunk/src/effects/SkBlurDrawLooper.cpp
gfx/skia/trunk/src/effects/SkBlurDrawLooper.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:e4cc5f799391 |
|---|---|
| 1 | |
| 2 /* | |
| 3 * Copyright 2011 Google Inc. | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 #include "SkBlurDrawLooper.h" | |
| 9 #include "SkBlurMask.h" // just for SkBlurMask::ConvertRadiusToSigma | |
| 10 #include "SkBlurMaskFilter.h" | |
| 11 #include "SkCanvas.h" | |
| 12 #include "SkColorFilter.h" | |
| 13 #include "SkReadBuffer.h" | |
| 14 #include "SkWriteBuffer.h" | |
| 15 #include "SkMaskFilter.h" | |
| 16 #include "SkPaint.h" | |
| 17 #include "SkString.h" | |
| 18 #include "SkStringUtils.h" | |
| 19 | |
| 20 SkBlurDrawLooper::SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy, | |
| 21 SkColor color, uint32_t flags) { | |
| 22 this->init(SkBlurMask::ConvertRadiusToSigma(radius), dx, dy, color, flags); | |
| 23 } | |
| 24 | |
| 25 SkBlurDrawLooper::SkBlurDrawLooper(SkColor color, SkScalar sigma, | |
| 26 SkScalar dx, SkScalar dy, uint32_t flags) { | |
| 27 this->init(sigma, dx, dy, color, flags); | |
| 28 } | |
| 29 | |
| 30 void SkBlurDrawLooper::init(SkScalar sigma, SkScalar dx, SkScalar dy, | |
| 31 SkColor color, uint32_t flags) { | |
| 32 fDx = dx; | |
| 33 fDy = dy; | |
| 34 fBlurColor = color; | |
| 35 fBlurFlags = flags; | |
| 36 | |
| 37 SkASSERT(flags <= kAll_BlurFlag); | |
| 38 if (sigma > 0) { | |
| 39 uint32_t blurFlags = flags & kIgnoreTransform_BlurFlag ? | |
| 40 SkBlurMaskFilter::kIgnoreTransform_BlurFlag : | |
| 41 SkBlurMaskFilter::kNone_BlurFlag; | |
| 42 | |
| 43 blurFlags |= flags & kHighQuality_BlurFlag ? | |
| 44 SkBlurMaskFilter::kHighQuality_BlurFlag : | |
| 45 SkBlurMaskFilter::kNone_BlurFlag; | |
| 46 | |
| 47 fBlur = SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle, | |
| 48 sigma, | |
| 49 blurFlags); | |
| 50 } else { | |
| 51 fBlur = NULL; | |
| 52 } | |
| 53 | |
| 54 if (flags & kOverrideColor_BlurFlag) { | |
| 55 // Set alpha to 1 for the override since transparency will already | |
| 56 // be baked into the blurred mask. | |
| 57 SkColor opaqueColor = SkColorSetA(color, 255); | |
| 58 //The SrcIn xfer mode will multiply 'color' by the incoming alpha | |
| 59 fColorFilter = SkColorFilter::CreateModeFilter(opaqueColor, | |
| 60 SkXfermode::kSrcIn_Mode); | |
| 61 } else { | |
| 62 fColorFilter = NULL; | |
| 63 } | |
| 64 } | |
| 65 | |
| 66 SkBlurDrawLooper::SkBlurDrawLooper(SkReadBuffer& buffer) | |
| 67 : INHERITED(buffer) { | |
| 68 | |
| 69 fDx = buffer.readScalar(); | |
| 70 fDy = buffer.readScalar(); | |
| 71 fBlurColor = buffer.readColor(); | |
| 72 fBlur = buffer.readMaskFilter(); | |
| 73 fColorFilter = buffer.readColorFilter(); | |
| 74 fBlurFlags = buffer.readUInt() & kAll_BlurFlag; | |
| 75 } | |
| 76 | |
| 77 SkBlurDrawLooper::~SkBlurDrawLooper() { | |
| 78 SkSafeUnref(fBlur); | |
| 79 SkSafeUnref(fColorFilter); | |
| 80 } | |
| 81 | |
| 82 void SkBlurDrawLooper::flatten(SkWriteBuffer& buffer) const { | |
| 83 this->INHERITED::flatten(buffer); | |
| 84 buffer.writeScalar(fDx); | |
| 85 buffer.writeScalar(fDy); | |
| 86 buffer.writeColor(fBlurColor); | |
| 87 buffer.writeFlattenable(fBlur); | |
| 88 buffer.writeFlattenable(fColorFilter); | |
| 89 buffer.writeUInt(fBlurFlags); | |
| 90 } | |
| 91 | |
| 92 SkDrawLooper::Context* SkBlurDrawLooper::createContext(SkCanvas*, void* storage) const { | |
| 93 return SkNEW_PLACEMENT_ARGS(storage, BlurDrawLooperContext, (this)); | |
| 94 } | |
| 95 | |
| 96 SkBlurDrawLooper::BlurDrawLooperContext::BlurDrawLooperContext( | |
| 97 const SkBlurDrawLooper* looper) | |
| 98 : fLooper(looper), fState(SkBlurDrawLooper::kBeforeEdge) {} | |
| 99 | |
| 100 bool SkBlurDrawLooper::BlurDrawLooperContext::next(SkCanvas* canvas, | |
| 101 SkPaint* paint) { | |
| 102 switch (fState) { | |
| 103 case kBeforeEdge: | |
| 104 // we do nothing if a maskfilter is already installed | |
| 105 if (paint->getMaskFilter()) { | |
| 106 fState = kDone; | |
| 107 return false; | |
| 108 } | |
| 109 #ifdef SK_BUILD_FOR_ANDROID | |
| 110 SkColor blurColor; | |
| 111 blurColor = fLooper->fBlurColor; | |
| 112 if (SkColorGetA(blurColor) == 255) { | |
| 113 blurColor = SkColorSetA(blurColor, paint->getAlpha()); | |
| 114 } | |
| 115 paint->setColor(blurColor); | |
| 116 #else | |
| 117 paint->setColor(fLooper->fBlurColor); | |
| 118 #endif | |
| 119 paint->setMaskFilter(fLooper->fBlur); | |
| 120 paint->setColorFilter(fLooper->fColorFilter); | |
| 121 canvas->save(SkCanvas::kMatrix_SaveFlag); | |
| 122 if (fLooper->fBlurFlags & kIgnoreTransform_BlurFlag) { | |
| 123 SkMatrix transform(canvas->getTotalMatrix()); | |
| 124 transform.postTranslate(fLooper->fDx, fLooper->fDy); | |
| 125 canvas->setMatrix(transform); | |
| 126 } else { | |
| 127 canvas->translate(fLooper->fDx, fLooper->fDy); | |
| 128 } | |
| 129 fState = kAfterEdge; | |
| 130 return true; | |
| 131 case kAfterEdge: | |
| 132 canvas->restore(); | |
| 133 fState = kDone; | |
| 134 return true; | |
| 135 default: | |
| 136 SkASSERT(kDone == fState); | |
| 137 return false; | |
| 138 } | |
| 139 } | |
| 140 | |
| 141 #ifndef SK_IGNORE_TO_STRING | |
| 142 void SkBlurDrawLooper::toString(SkString* str) const { | |
| 143 str->append("SkBlurDrawLooper: "); | |
| 144 | |
| 145 str->append("dx: "); | |
| 146 str->appendScalar(fDx); | |
| 147 | |
| 148 str->append(" dy: "); | |
| 149 str->appendScalar(fDy); | |
| 150 | |
| 151 str->append(" color: "); | |
| 152 str->appendHex(fBlurColor); | |
| 153 | |
| 154 str->append(" flags: ("); | |
| 155 if (kNone_BlurFlag == fBlurFlags) { | |
| 156 str->append("None"); | |
| 157 } else { | |
| 158 bool needsSeparator = false; | |
| 159 SkAddFlagToString(str, SkToBool(kIgnoreTransform_BlurFlag & fBlurFlags), "IgnoreTransform", | |
| 160 &needsSeparator); | |
| 161 SkAddFlagToString(str, SkToBool(kOverrideColor_BlurFlag & fBlurFlags), "OverrideColor", | |
| 162 &needsSeparator); | |
| 163 SkAddFlagToString(str, SkToBool(kHighQuality_BlurFlag & fBlurFlags), "HighQuality", | |
| 164 &needsSeparator); | |
| 165 } | |
| 166 str->append(")"); | |
| 167 | |
| 168 // TODO: add optional "fBlurFilter->toString(str);" when SkMaskFilter::toString is added | |
| 169 // alternatively we could cache the radius in SkBlurDrawLooper and just add it here | |
| 170 } | |
| 171 #endif |
