1 /* 2 * Copyright 2012 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "GrSWMaskHelper.h" 9 10 #include "GrCaps.h" 11 #include "GrDrawTarget.h" 12 #include "GrGpu.h" 13 #include "GrPipelineBuilder.h" 14 15 #include "SkData.h" 16 #include "SkDistanceFieldGen.h" 17 #include "SkStrokeRec.h" 18 19 #include "batches/GrRectBatchFactory.h" 20 21 namespace { 22 23 /* 24 * Convert a boolean operation into a transfer mode code 25 */ 26 SkXfermode::Mode op_to_mode(SkRegion::Op op) { 27 28 static const SkXfermode::Mode modeMap[] = { 29 SkXfermode::kDstOut_Mode, // kDifference_Op 30 SkXfermode::kModulate_Mode, // kIntersect_Op 31 SkXfermode::kSrcOver_Mode, // kUnion_Op 32 SkXfermode::kXor_Mode, // kXOR_Op 33 SkXfermode::kClear_Mode, // kReverseDifference_Op 34 SkXfermode::kSrc_Mode, // kReplace_Op 35 }; 36 37 return modeMap[op]; 38 } 39 40 static inline GrPixelConfig fmt_to_config(SkTextureCompressor::Format fmt) { 41 42 GrPixelConfig config; 43 switch (fmt) { 44 case SkTextureCompressor::kLATC_Format: 45 config = kLATC_GrPixelConfig; 46 break; 47 48 case SkTextureCompressor::kR11_EAC_Format: 49 config = kR11_EAC_GrPixelConfig; 50 break; 51 52 case SkTextureCompressor::kASTC_12x12_Format: 53 config = kASTC_12x12_GrPixelConfig; 54 break; 55 56 case SkTextureCompressor::kETC1_Format: 57 config = kETC1_GrPixelConfig; 58 break; 59 60 default: 61 SkDEBUGFAIL("No GrPixelConfig for compression format!"); 62 // Best guess 63 config = kAlpha_8_GrPixelConfig; 64 break; 65 } 66 67 return config; 68 } 69 70 static bool choose_compressed_fmt(const GrCaps* caps, 71 SkTextureCompressor::Format *fmt) { 72 if (nullptr == fmt) { 73 return false; 74 } 75 76 // We can't use scratch textures without the ability to update 77 // compressed textures... 78 if (!(caps->compressedTexSubImageSupport())) { 79 return false; 80 } 81 82 // Figure out what our preferred texture type is. If ASTC is available, that always 83 // gives the biggest win. Otherwise, in terms of compression speed and accuracy, 84 // LATC has a slight edge over R11 EAC. 85 if (caps->isConfigTexturable(kASTC_12x12_GrPixelConfig)) { 86 *fmt = SkTextureCompressor::kASTC_12x12_Format; 87 return true; 88 } else if (caps->isConfigTexturable(kLATC_GrPixelConfig)) { 89 *fmt = SkTextureCompressor::kLATC_Format; 90 return true; 91 } else if (caps->isConfigTexturable(kR11_EAC_GrPixelConfig)) { 92 *fmt = SkTextureCompressor::kR11_EAC_Format; 93 return true; 94 } 95 96 return false; 97 } 98 99 } 100 101 /** 102 * Draw a single rect element of the clip stack into the accumulation bitmap 103 */ 104 void GrSWMaskHelper::draw(const SkRect& rect, SkRegion::Op op, 105 bool antiAlias, uint8_t alpha) { 106 SkPaint paint; 107 108 SkXfermode* mode = SkXfermode::Create(op_to_mode(op)); 109 110 SkASSERT(kNone_CompressionMode == fCompressionMode); 111 112 paint.setXfermode(mode); 113 paint.setAntiAlias(antiAlias); 114 paint.setColor(SkColorSetARGB(alpha, alpha, alpha, alpha)); 115 116 fDraw.drawRect(rect, paint); 117 118 SkSafeUnref(mode); 119 } 120 121 /** 122 * Draw a single path element of the clip stack into the accumulation bitmap 123 */ 124 void GrSWMaskHelper::draw(const SkPath& path, const SkStrokeRec& stroke, SkRegion::Op op, 125 bool antiAlias, uint8_t alpha) { 126 127 SkPaint paint; 128 if (stroke.isHairlineStyle()) { 129 paint.setStyle(SkPaint::kStroke_Style); 130 paint.setStrokeWidth(SK_Scalar1); 131 } else { 132 if (stroke.isFillStyle()) { 133 paint.setStyle(SkPaint::kFill_Style); 134 } else { 135 paint.setStyle(SkPaint::kStroke_Style); 136 paint.setStrokeJoin(stroke.getJoin()); 137 paint.setStrokeCap(stroke.getCap()); 138 paint.setStrokeWidth(stroke.getWidth()); 139 } 140 } 141 paint.setAntiAlias(antiAlias); 142 143 SkTBlitterAllocator allocator; 144 SkBlitter* blitter = nullptr; 145 if (kBlitter_CompressionMode == fCompressionMode) { 146 SkASSERT(fCompressedBuffer.get()); 147 blitter = SkTextureCompressor::CreateBlitterForFormat( 148 fPixels.width(), fPixels.height(), fCompressedBuffer.get(), &allocator, 149 fCompressedFormat); 150 } 151 152 if (SkRegion::kReplace_Op == op && 0xFF == alpha) { 153 SkASSERT(0xFF == paint.getAlpha()); 154 fDraw.drawPathCoverage(path, paint, blitter); 155 } else { 156 paint.setXfermodeMode(op_to_mode(op)); 157 paint.setColor(SkColorSetARGB(alpha, alpha, alpha, alpha)); 158 fDraw.drawPath(path, paint, blitter); 159 } 160 } 161 162 bool GrSWMaskHelper::init(const SkIRect& resultBounds, 163 const SkMatrix* matrix, 164 bool allowCompression) { 165 if (matrix) { 166 fMatrix = *matrix; 167 } else { 168 fMatrix.setIdentity(); 169 } 170 171 // Now translate so the bound's UL corner is at the origin 172 fMatrix.postTranslate(-resultBounds.fLeft * SK_Scalar1, 173 -resultBounds.fTop * SK_Scalar1); 174 SkIRect bounds = SkIRect::MakeWH(resultBounds.width(), 175 resultBounds.height()); 176 177 if (allowCompression && 178 fContext->caps()->drawPathMasksToCompressedTexturesSupport() && 179 choose_compressed_fmt(fContext->caps(), &fCompressedFormat)) { 180 fCompressionMode = kCompress_CompressionMode; 181 } 182 183 // Make sure that the width is a multiple of the desired block dimensions 184 // to allow for specialized SIMD instructions that compress multiple blocks at a time. 185 int cmpWidth = bounds.fRight; 186 int cmpHeight = bounds.fBottom; 187 if (kCompress_CompressionMode == fCompressionMode) { 188 int dimX, dimY; 189 SkTextureCompressor::GetBlockDimensions(fCompressedFormat, &dimX, &dimY); 190 cmpWidth = dimX * ((cmpWidth + (dimX - 1)) / dimX); 191 cmpHeight = dimY * ((cmpHeight + (dimY - 1)) / dimY); 192 193 // Can we create a blitter? 194 if (SkTextureCompressor::ExistsBlitterForFormat(fCompressedFormat)) { 195 int cmpSz = SkTextureCompressor::GetCompressedDataSize( 196 fCompressedFormat, cmpWidth, cmpHeight); 197 198 SkASSERT(cmpSz > 0); 199 SkASSERT(nullptr == fCompressedBuffer.get()); 200 fCompressedBuffer.reset(cmpSz); 201 fCompressionMode = kBlitter_CompressionMode; 202 } 203 } 204 205 sk_bzero(&fDraw, sizeof(fDraw)); 206 207 // If we don't have a custom blitter, then we either need a bitmap to compress 208 // from or a bitmap that we're going to use as a texture. In any case, we should 209 // allocate the pixels for a bitmap 210 const SkImageInfo bmImageInfo = SkImageInfo::MakeA8(cmpWidth, cmpHeight); 211 if (kBlitter_CompressionMode != fCompressionMode) { 212 if (!fPixels.tryAlloc(bmImageInfo)) { 213 return false; 214 } 215 fPixels.erase(0); 216 } else { 217 // Otherwise, we just need to remember how big the buffer is... 218 fPixels.reset(bmImageInfo); 219 } 220 fDraw.fDst = fPixels; 221 fRasterClip.setRect(bounds); 222 fDraw.fRC = &fRasterClip; 223 fDraw.fClip = &fRasterClip.bwRgn(); 224 fDraw.fMatrix = &fMatrix; 225 return true; 226 } 227 228 /** 229 * Get a texture (from the texture cache) of the correct size & format. 230 */ 231 GrTexture* GrSWMaskHelper::createTexture() { 232 GrSurfaceDesc desc; 233 desc.fWidth = fPixels.width(); 234 desc.fHeight = fPixels.height(); 235 desc.fConfig = kAlpha_8_GrPixelConfig; 236 237 if (kNone_CompressionMode != fCompressionMode) { 238 239 #ifdef SK_DEBUG 240 int dimX, dimY; 241 SkTextureCompressor::GetBlockDimensions(fCompressedFormat, &dimX, &dimY); 242 SkASSERT((desc.fWidth % dimX) == 0); 243 SkASSERT((desc.fHeight % dimY) == 0); 244 #endif 245 246 desc.fConfig = fmt_to_config(fCompressedFormat); 247 SkASSERT(fContext->caps()->isConfigTexturable(desc.fConfig)); 248 } 249 250 return fContext->textureProvider()->createApproxTexture(desc); 251 } 252 253 void GrSWMaskHelper::sendTextureData(GrTexture *texture, const GrSurfaceDesc& desc, 254 const void *data, size_t rowbytes) { 255 // Since we're uploading to it, and it's compressed, 'texture' shouldn't 256 // have a render target. 257 SkASSERT(nullptr == texture->asRenderTarget()); 258 259 texture->writePixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig, data, rowbytes); 260 } 261 262 void GrSWMaskHelper::compressTextureData(GrTexture *texture, const GrSurfaceDesc& desc) { 263 264 SkASSERT(GrPixelConfigIsCompressed(desc.fConfig)); 265 SkASSERT(fmt_to_config(fCompressedFormat) == desc.fConfig); 266 267 SkAutoDataUnref cmpData(SkTextureCompressor::CompressBitmapToFormat(fPixels, 268 fCompressedFormat)); 269 SkASSERT(cmpData); 270 271 this->sendTextureData(texture, desc, cmpData->data(), 0); 272 } 273 274 /** 275 * Move the result of the software mask generation back to the gpu 276 */ 277 void GrSWMaskHelper::toTexture(GrTexture *texture) { 278 GrSurfaceDesc desc; 279 desc.fWidth = fPixels.width(); 280 desc.fHeight = fPixels.height(); 281 desc.fConfig = texture->config(); 282 283 // First see if we should compress this texture before uploading. 284 switch (fCompressionMode) { 285 case kNone_CompressionMode: 286 this->sendTextureData(texture, desc, fPixels.addr(), fPixels.rowBytes()); 287 break; 288 289 case kCompress_CompressionMode: 290 this->compressTextureData(texture, desc); 291 break; 292 293 case kBlitter_CompressionMode: 294 SkASSERT(fCompressedBuffer.get()); 295 this->sendTextureData(texture, desc, fCompressedBuffer.get(), 0); 296 break; 297 } 298 } 299 300 /** 301 * Convert mask generation results to a signed distance field 302 */ 303 void GrSWMaskHelper::toSDF(unsigned char* sdf) { 304 SkGenerateDistanceFieldFromA8Image(sdf, (const unsigned char*)fPixels.addr(), 305 fPixels.width(), fPixels.height(), fPixels.rowBytes()); 306 } 307 308 //////////////////////////////////////////////////////////////////////////////// 309 /** 310 * Software rasterizes path to A8 mask (possibly using the context's matrix) 311 * and uploads the result to a scratch texture. Returns the resulting 312 * texture on success; nullptr on failure. 313 */ 314 GrTexture* GrSWMaskHelper::DrawPathMaskToTexture(GrContext* context, 315 const SkPath& path, 316 const SkStrokeRec& stroke, 317 const SkIRect& resultBounds, 318 bool antiAlias, 319 const SkMatrix* matrix) { 320 GrSWMaskHelper helper(context); 321 322 if (!helper.init(resultBounds, matrix)) { 323 return nullptr; 324 } 325 326 helper.draw(path, stroke, SkRegion::kReplace_Op, antiAlias, 0xFF); 327 328 GrTexture* texture(helper.createTexture()); 329 if (!texture) { 330 return nullptr; 331 } 332 333 helper.toTexture(texture); 334 335 return texture; 336 } 337 338 void GrSWMaskHelper::DrawToTargetWithPathMask(GrTexture* texture, 339 GrDrawTarget* target, 340 GrPipelineBuilder* pipelineBuilder, 341 GrColor color, 342 const SkMatrix& viewMatrix, 343 const SkIRect& rect) { 344 SkMatrix invert; 345 if (!viewMatrix.invert(&invert)) { 346 return; 347 } 348 GrPipelineBuilder::AutoRestoreFragmentProcessorState arfps(*pipelineBuilder); 349 350 SkRect dstRect = SkRect::MakeLTRB(SK_Scalar1 * rect.fLeft, 351 SK_Scalar1 * rect.fTop, 352 SK_Scalar1 * rect.fRight, 353 SK_Scalar1 * rect.fBottom); 354 355 // We use device coords to compute the texture coordinates. We take the device coords and apply 356 // a translation so that the top-left of the device bounds maps to 0,0, and then a scaling 357 // matrix to normalized coords. 358 SkMatrix maskMatrix; 359 maskMatrix.setIDiv(texture->width(), texture->height()); 360 maskMatrix.preTranslate(SkIntToScalar(-rect.fLeft), SkIntToScalar(-rect.fTop)); 361 362 pipelineBuilder->addCoverageFragmentProcessor( 363 GrSimpleTextureEffect::Create(texture, 364 maskMatrix, 365 GrTextureParams::kNone_FilterMode, 366 kDevice_GrCoordSet))->unref(); 367 368 SkAutoTUnref<GrDrawBatch> batch(GrRectBatchFactory::CreateNonAAFill(color, SkMatrix::I(), 369 dstRect, nullptr, &invert)); 370 target->drawBatch(*pipelineBuilder, batch); 371 } 372
