reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1 | /* libs/graphics/effects/SkLayerRasterizer.cpp |
| 2 | ** |
| 3 | ** Copyright 2006, The Android Open Source Project |
| 4 | ** |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame^] | 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 8 | ** |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame^] | 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 10 | ** |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame^] | 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include "SkLayerRasterizer.h" |
| 19 | #include "SkBuffer.h" |
| 20 | #include "SkDraw.h" |
| 21 | #include "SkMask.h" |
| 22 | #include "SkMaskFilter.h" |
| 23 | #include "SkPaint.h" |
| 24 | #include "SkPath.h" |
| 25 | #include "SkRegion.h" |
| 26 | #include "SkXfermode.h" |
| 27 | #include <new> |
| 28 | |
| 29 | struct SkLayerRasterizer_Rec { |
| 30 | SkPaint fPaint; |
| 31 | SkVector fOffset; |
| 32 | }; |
| 33 | |
| 34 | SkLayerRasterizer::SkLayerRasterizer() : fLayers(sizeof(SkLayerRasterizer_Rec)) |
| 35 | { |
| 36 | } |
| 37 | |
| 38 | SkLayerRasterizer::~SkLayerRasterizer() |
| 39 | { |
| 40 | SkDeque::Iter iter(fLayers); |
| 41 | SkLayerRasterizer_Rec* rec; |
| 42 | |
| 43 | while ((rec = (SkLayerRasterizer_Rec*)iter.next()) != NULL) |
| 44 | rec->fPaint.~SkPaint(); |
| 45 | } |
| 46 | |
| 47 | void SkLayerRasterizer::addLayer(const SkPaint& paint, SkScalar dx, SkScalar dy) |
| 48 | { |
| 49 | SkLayerRasterizer_Rec* rec = (SkLayerRasterizer_Rec*)fLayers.push_back(); |
| 50 | |
| 51 | new (&rec->fPaint) SkPaint(paint); |
| 52 | rec->fOffset.set(dx, dy); |
| 53 | } |
| 54 | |
| 55 | static bool compute_bounds(const SkDeque& layers, const SkPath& path, const SkMatrix& matrix, |
| 56 | const SkIRect* clipBounds, SkIRect* bounds) |
| 57 | { |
| 58 | SkDeque::Iter iter(layers); |
| 59 | SkLayerRasterizer_Rec* rec; |
| 60 | |
| 61 | bounds->set(SK_MaxS32, SK_MaxS32, SK_MinS32, SK_MinS32); |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame^] | 62 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 63 | while ((rec = (SkLayerRasterizer_Rec*)iter.next()) != NULL) |
| 64 | { |
| 65 | const SkPaint& paint = rec->fPaint; |
| 66 | SkPath fillPath, devPath; |
| 67 | const SkPath* p = &path; |
| 68 | |
| 69 | if (paint.getPathEffect() || paint.getStyle() != SkPaint::kFill_Style) |
| 70 | { |
| 71 | paint.getFillPath(path, &fillPath); |
| 72 | p = &fillPath; |
| 73 | } |
| 74 | if (p->isEmpty()) |
| 75 | continue; |
| 76 | |
| 77 | // apply the matrix and offset |
| 78 | { |
| 79 | SkMatrix m = matrix; |
| 80 | m.preTranslate(rec->fOffset.fX, rec->fOffset.fY); |
| 81 | p->transform(m, &devPath); |
| 82 | } |
| 83 | |
| 84 | SkMask mask; |
| 85 | if (!SkDraw::DrawToMask(devPath, clipBounds, paint.getMaskFilter(), &matrix, |
| 86 | &mask, SkMask::kJustComputeBounds_CreateMode)) |
| 87 | return false; |
| 88 | |
| 89 | bounds->join(mask.fBounds); |
| 90 | } |
| 91 | return true; |
| 92 | } |
| 93 | |
| 94 | bool SkLayerRasterizer::onRasterize(const SkPath& path, const SkMatrix& matrix, |
| 95 | const SkIRect* clipBounds, |
| 96 | SkMask* mask, SkMask::CreateMode mode) |
| 97 | { |
| 98 | if (fLayers.empty()) |
| 99 | return false; |
| 100 | |
| 101 | if (SkMask::kJustRenderImage_CreateMode != mode) |
| 102 | { |
| 103 | if (!compute_bounds(fLayers, path, matrix, clipBounds, &mask->fBounds)) |
| 104 | return false; |
| 105 | } |
| 106 | |
| 107 | if (SkMask::kComputeBoundsAndRenderImage_CreateMode == mode) |
| 108 | { |
| 109 | mask->fFormat = SkMask::kA8_Format; |
reed@android.com | 49f0ff2 | 2009-03-19 21:52:42 +0000 | [diff] [blame] | 110 | mask->fRowBytes = mask->fBounds.width(); |
reed@android.com | 543ed93 | 2009-04-24 12:43:40 +0000 | [diff] [blame] | 111 | size_t size = mask->computeImageSize(); |
| 112 | if (0 == size) { |
| 113 | return false; // too big to allocate, abort |
| 114 | } |
| 115 | mask->fImage = SkMask::AllocImage(size); |
| 116 | memset(mask->fImage, 0, size); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | if (SkMask::kJustComputeBounds_CreateMode != mode) |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame^] | 120 | { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 121 | SkBitmap device; |
| 122 | SkDraw draw; |
| 123 | SkMatrix translatedMatrix; // this translates us to our local pixels |
| 124 | SkMatrix drawMatrix; // this translates the path by each layer's offset |
| 125 | SkRegion rectClip; |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame^] | 126 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 127 | rectClip.setRect(0, 0, mask->fBounds.width(), mask->fBounds.height()); |
| 128 | |
| 129 | translatedMatrix = matrix; |
| 130 | translatedMatrix.postTranslate(-SkIntToScalar(mask->fBounds.fLeft), |
| 131 | -SkIntToScalar(mask->fBounds.fTop)); |
| 132 | |
| 133 | device.setConfig(SkBitmap::kA8_Config, mask->fBounds.width(), mask->fBounds.height(), mask->fRowBytes); |
| 134 | device.setPixels(mask->fImage); |
| 135 | |
| 136 | draw.fBitmap = &device; |
| 137 | draw.fMatrix = &drawMatrix; |
| 138 | draw.fClip = &rectClip; |
| 139 | // we set the matrixproc in the loop, as the matrix changes each time (potentially) |
| 140 | draw.fBounder = NULL; |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame^] | 141 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 142 | SkDeque::Iter iter(fLayers); |
| 143 | SkLayerRasterizer_Rec* rec; |
| 144 | |
| 145 | while ((rec = (SkLayerRasterizer_Rec*)iter.next()) != NULL) { |
| 146 | drawMatrix = translatedMatrix; |
| 147 | drawMatrix.preTranslate(rec->fOffset.fX, rec->fOffset.fY); |
| 148 | draw.drawPath(path, rec->fPaint); |
| 149 | } |
| 150 | } |
| 151 | return true; |
| 152 | } |
| 153 | |
| 154 | /////////// Routines for flattening ///////////////// |
| 155 | |
| 156 | static void paint_read(SkPaint* paint, SkFlattenableReadBuffer& buffer) |
| 157 | { |
| 158 | paint->setAntiAlias(buffer.readBool()); |
| 159 | paint->setStyle((SkPaint::Style)buffer.readU8()); |
| 160 | paint->setAlpha(buffer.readU8()); |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame^] | 161 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 162 | if (paint->getStyle() != SkPaint::kFill_Style) |
| 163 | { |
| 164 | paint->setStrokeWidth(buffer.readScalar()); |
| 165 | paint->setStrokeMiter(buffer.readScalar()); |
| 166 | paint->setStrokeCap((SkPaint::Cap)buffer.readU8()); |
| 167 | paint->setStrokeJoin((SkPaint::Join)buffer.readU8()); |
| 168 | } |
| 169 | |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame^] | 170 | SkSafeUnref(paint->setMaskFilter((SkMaskFilter*)buffer.readFlattenable())); |
| 171 | SkSafeUnref(paint->setPathEffect((SkPathEffect*)buffer.readFlattenable())); |
| 172 | SkSafeUnref(paint->setRasterizer((SkRasterizer*)buffer.readFlattenable())); |
| 173 | SkSafeUnref(paint->setXfermode((SkXfermode*)buffer.readFlattenable())); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | static void paint_write(const SkPaint& paint, SkFlattenableWriteBuffer& buffer) |
| 177 | { |
| 178 | buffer.writeBool(paint.isAntiAlias()); |
| 179 | buffer.write8(paint.getStyle()); |
| 180 | buffer.write8(paint.getAlpha()); |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame^] | 181 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 182 | if (paint.getStyle() != SkPaint::kFill_Style) |
| 183 | { |
| 184 | buffer.writeScalar(paint.getStrokeWidth()); |
| 185 | buffer.writeScalar(paint.getStrokeMiter()); |
| 186 | buffer.write8(paint.getStrokeCap()); |
| 187 | buffer.write8(paint.getStrokeJoin()); |
| 188 | } |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame^] | 189 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 190 | buffer.writeFlattenable(paint.getMaskFilter()); |
| 191 | buffer.writeFlattenable(paint.getPathEffect()); |
| 192 | buffer.writeFlattenable(paint.getRasterizer()); |
| 193 | buffer.writeFlattenable(paint.getXfermode()); |
| 194 | } |
| 195 | |
| 196 | SkLayerRasterizer::SkLayerRasterizer(SkFlattenableReadBuffer& buffer) |
| 197 | : SkRasterizer(buffer), fLayers(sizeof(SkLayerRasterizer_Rec)) |
| 198 | { |
| 199 | int count = buffer.readS32(); |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame^] | 200 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 201 | for (int i = 0; i < count; i++) |
| 202 | { |
| 203 | SkLayerRasterizer_Rec* rec = (SkLayerRasterizer_Rec*)fLayers.push_back(); |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame^] | 204 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 205 | #if 0 |
| 206 | new (&rec->fPaint) SkPaint(buffer); |
| 207 | #else |
| 208 | new (&rec->fPaint) SkPaint; |
| 209 | paint_read(&rec->fPaint, buffer); |
| 210 | #endif |
| 211 | rec->fOffset.fX = buffer.readScalar(); |
| 212 | rec->fOffset.fY = buffer.readScalar(); |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | void SkLayerRasterizer::flatten(SkFlattenableWriteBuffer& buffer) |
| 217 | { |
| 218 | this->INHERITED::flatten(buffer); |
| 219 | |
| 220 | buffer.write32(fLayers.count()); |
| 221 | |
| 222 | SkDeque::Iter iter(fLayers); |
| 223 | const SkLayerRasterizer_Rec* rec; |
| 224 | |
| 225 | while ((rec = (const SkLayerRasterizer_Rec*)iter.next()) != NULL) |
| 226 | { |
| 227 | #if 0 |
| 228 | rec->fPaint.flatten(buffer); |
| 229 | #else |
| 230 | paint_write(rec->fPaint, buffer); |
| 231 | #endif |
| 232 | buffer.writeScalar(rec->fOffset.fX); |
| 233 | buffer.writeScalar(rec->fOffset.fY); |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | SkFlattenable* SkLayerRasterizer::CreateProc(SkFlattenableReadBuffer& buffer) |
| 238 | { |
| 239 | return SkNEW_ARGS(SkLayerRasterizer, (buffer)); |
| 240 | } |
| 241 | |
| 242 | SkFlattenable::Factory SkLayerRasterizer::getFactory() |
| 243 | { |
| 244 | return CreateProc; |
| 245 | } |
| 246 | |