SkImageShader.cpp revision 5e34167d53c06c3c4512592bd1477fcf2df97172
1/* 2 * Copyright 2015 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 "SkArenaAlloc.h" 9#include "SkBitmapController.h" 10#include "SkBitmapProcShader.h" 11#include "SkBitmapProvider.h" 12#include "SkEmptyShader.h" 13#include "SkImage_Base.h" 14#include "SkImageShader.h" 15#include "SkPM4fPriv.h" 16#include "SkReadBuffer.h" 17#include "SkWriteBuffer.h" 18#include "../jumper/SkJumper.h" 19 20/** 21 * We are faster in clamp, so always use that tiling when we can. 22 */ 23static SkShader::TileMode optimize(SkShader::TileMode tm, int dimension) { 24 SkASSERT(dimension > 0); 25#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK 26 // need to update frameworks/base/libs/hwui/tests/unit/SkiaBehaviorTests.cpp:55 to allow 27 // for transforming to clamp. 28 return tm; 29#else 30 return dimension == 1 ? SkShader::kClamp_TileMode : tm; 31#endif 32} 33 34SkImageShader::SkImageShader(sk_sp<SkImage> img, TileMode tmx, TileMode tmy, const SkMatrix* matrix) 35 : INHERITED(matrix) 36 , fImage(std::move(img)) 37 , fTileModeX(optimize(tmx, fImage->width())) 38 , fTileModeY(optimize(tmy, fImage->height())) 39{} 40 41sk_sp<SkFlattenable> SkImageShader::CreateProc(SkReadBuffer& buffer) { 42 const TileMode tx = (TileMode)buffer.readUInt(); 43 const TileMode ty = (TileMode)buffer.readUInt(); 44 SkMatrix matrix; 45 buffer.readMatrix(&matrix); 46 sk_sp<SkImage> img = buffer.readImage(); 47 if (!img) { 48 return nullptr; 49 } 50 return SkImageShader::Make(std::move(img), tx, ty, &matrix); 51} 52 53void SkImageShader::flatten(SkWriteBuffer& buffer) const { 54 buffer.writeUInt(fTileModeX); 55 buffer.writeUInt(fTileModeY); 56 buffer.writeMatrix(this->getLocalMatrix()); 57 buffer.writeImage(fImage.get()); 58} 59 60bool SkImageShader::isOpaque() const { 61 return fImage->isOpaque(); 62} 63 64bool SkImageShader::IsRasterPipelineOnly(const SkMatrix& ctm, SkColorType ct, SkAlphaType at, 65 SkShader::TileMode tx, SkShader::TileMode ty, 66 const SkMatrix& localM) { 67 if (ct != kN32_SkColorType) { 68 return true; 69 } 70 if (at == kUnpremul_SkAlphaType) { 71 return true; 72 } 73#ifndef SK_SUPPORT_LEGACY_TILED_BITMAPS 74 if (tx != ty) { 75 return true; 76 } 77#endif 78 if (!ctm.isScaleTranslate()) { 79 return true; 80 } 81 if (!localM.isScaleTranslate()) { 82 return true; 83 } 84 return false; 85} 86 87bool SkImageShader::onIsRasterPipelineOnly(const SkMatrix& ctm) const { 88 SkBitmapProvider provider(fImage.get(), nullptr); 89 return IsRasterPipelineOnly(ctm, provider.info().colorType(), provider.info().alphaType(), 90 fTileModeX, fTileModeY, this->getLocalMatrix()); 91} 92 93SkShaderBase::Context* SkImageShader::onMakeContext(const ContextRec& rec, 94 SkArenaAlloc* alloc) const { 95 return SkBitmapProcLegacyShader::MakeContext(*this, fTileModeX, fTileModeY, 96 SkBitmapProvider(fImage.get(), rec.fDstColorSpace), 97 rec, alloc); 98} 99 100SkImage* SkImageShader::onIsAImage(SkMatrix* texM, TileMode xy[]) const { 101 if (texM) { 102 *texM = this->getLocalMatrix(); 103 } 104 if (xy) { 105 xy[0] = (TileMode)fTileModeX; 106 xy[1] = (TileMode)fTileModeY; 107 } 108 return const_cast<SkImage*>(fImage.get()); 109} 110 111#ifdef SK_SUPPORT_LEGACY_SHADER_ISABITMAP 112bool SkImageShader::onIsABitmap(SkBitmap* texture, SkMatrix* texM, TileMode xy[]) const { 113 const SkBitmap* bm = as_IB(fImage)->onPeekBitmap(); 114 if (!bm) { 115 return false; 116 } 117 118 if (texture) { 119 *texture = *bm; 120 } 121 if (texM) { 122 *texM = this->getLocalMatrix(); 123 } 124 if (xy) { 125 xy[0] = (TileMode)fTileModeX; 126 xy[1] = (TileMode)fTileModeY; 127 } 128 return true; 129} 130#endif 131 132static bool bitmap_is_too_big(int w, int h) { 133 // SkBitmapProcShader stores bitmap coordinates in a 16bit buffer, as it 134 // communicates between its matrix-proc and its sampler-proc. Until we can 135 // widen that, we have to reject bitmaps that are larger. 136 // 137 static const int kMaxSize = 65535; 138 139 return w > kMaxSize || h > kMaxSize; 140} 141 142sk_sp<SkShader> SkImageShader::Make(sk_sp<SkImage> image, TileMode tx, TileMode ty, 143 const SkMatrix* localMatrix) { 144 if (!image || bitmap_is_too_big(image->width(), image->height())) { 145 return sk_make_sp<SkEmptyShader>(); 146 } else { 147 return sk_make_sp<SkImageShader>(image, tx, ty, localMatrix); 148 } 149} 150 151#ifndef SK_IGNORE_TO_STRING 152void SkImageShader::toString(SkString* str) const { 153 const char* gTileModeName[SkShader::kTileModeCount] = { 154 "clamp", "repeat", "mirror" 155 }; 156 157 str->appendf("ImageShader: ((%s %s) ", gTileModeName[fTileModeX], gTileModeName[fTileModeY]); 158 fImage->toString(str); 159 this->INHERITED::toString(str); 160 str->append(")"); 161} 162#endif 163 164/////////////////////////////////////////////////////////////////////////////////////////////////// 165 166#if SK_SUPPORT_GPU 167 168#include "SkGr.h" 169#include "GrContext.h" 170#include "effects/GrSimpleTextureEffect.h" 171#include "effects/GrBicubicEffect.h" 172#include "effects/GrSimpleTextureEffect.h" 173 174static GrSamplerState::WrapMode tile_mode_to_wrap_mode(const SkShader::TileMode tileMode) { 175 switch (tileMode) { 176 case SkShader::TileMode::kClamp_TileMode: 177 return GrSamplerState::WrapMode::kClamp; 178 case SkShader::TileMode::kRepeat_TileMode: 179 return GrSamplerState::WrapMode::kRepeat; 180 case SkShader::TileMode::kMirror_TileMode: 181 return GrSamplerState::WrapMode::kMirrorRepeat; 182 } 183 SK_ABORT("Unknown tile mode."); 184 return GrSamplerState::WrapMode::kClamp; 185} 186 187std::unique_ptr<GrFragmentProcessor> SkImageShader::asFragmentProcessor( 188 const AsFPArgs& args) const { 189 SkMatrix lmInverse; 190 if (!this->getLocalMatrix().invert(&lmInverse)) { 191 return nullptr; 192 } 193 if (args.fLocalMatrix) { 194 SkMatrix inv; 195 if (!args.fLocalMatrix->invert(&inv)) { 196 return nullptr; 197 } 198 lmInverse.postConcat(inv); 199 } 200 201 GrSamplerState::WrapMode wrapModes[] = {tile_mode_to_wrap_mode(fTileModeX), 202 tile_mode_to_wrap_mode(fTileModeY)}; 203 204 // Must set wrap and filter on the sampler before requesting a texture. In two places below 205 // we check the matrix scale factors to determine how to interpret the filter quality setting. 206 // This completely ignores the complexity of the drawVertices case where explicit local coords 207 // are provided by the caller. 208 bool doBicubic; 209 GrSamplerState::Filter textureFilterMode = GrSkFilterQualityToGrFilterMode( 210 args.fFilterQuality, *args.fViewMatrix, this->getLocalMatrix(), &doBicubic); 211 GrSamplerState samplerState(wrapModes, textureFilterMode); 212 sk_sp<SkColorSpace> texColorSpace; 213 SkScalar scaleAdjust[2] = { 1.0f, 1.0f }; 214 sk_sp<GrTextureProxy> proxy(as_IB(fImage)->asTextureProxyRef( 215 args.fContext, samplerState, args.fDstColorSpace, &texColorSpace, scaleAdjust)); 216 if (!proxy) { 217 return nullptr; 218 } 219 220 bool isAlphaOnly = GrPixelConfigIsAlphaOnly(proxy->config()); 221 222 lmInverse.postScale(scaleAdjust[0], scaleAdjust[1]); 223 224 std::unique_ptr<GrFragmentProcessor> inner; 225 if (doBicubic) { 226 inner = GrBicubicEffect::Make(std::move(proxy), lmInverse, wrapModes); 227 } else { 228 inner = GrSimpleTextureEffect::Make(std::move(proxy), nullptr, lmInverse, samplerState); 229 } 230 inner = GrColorSpaceXformEffect::Make(std::move(inner), texColorSpace.get(), 231 args.fDstColorSpace); 232 if (isAlphaOnly) { 233 return inner; 234 } 235 return GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner)); 236} 237 238#endif 239 240/////////////////////////////////////////////////////////////////////////////////////////////////// 241#include "SkImagePriv.h" 242 243sk_sp<SkShader> SkMakeBitmapShader(const SkBitmap& src, SkShader::TileMode tmx, 244 SkShader::TileMode tmy, const SkMatrix* localMatrix, 245 SkCopyPixelsMode cpm) { 246 return SkImageShader::Make(SkMakeImageFromRasterBitmap(src, cpm), 247 tmx, tmy, localMatrix); 248} 249 250static sk_sp<SkFlattenable> SkBitmapProcShader_CreateProc(SkReadBuffer& buffer) { 251 SkMatrix lm; 252 buffer.readMatrix(&lm); 253 sk_sp<SkImage> image = buffer.readBitmapAsImage(); 254 SkShader::TileMode mx = (SkShader::TileMode)buffer.readUInt(); 255 SkShader::TileMode my = (SkShader::TileMode)buffer.readUInt(); 256 return image ? image->makeShader(mx, my, &lm) : nullptr; 257} 258 259SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkShaderBase) 260SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkImageShader) 261SkFlattenable::Register("SkBitmapProcShader", SkBitmapProcShader_CreateProc, kSkShaderBase_Type); 262SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END 263 264 265bool SkImageShader::onAppendStages(const StageRec& rec) const { 266 SkRasterPipeline* p = rec.fPipeline; 267 SkArenaAlloc* alloc = rec.fAlloc; 268 269 auto matrix = SkMatrix::Concat(rec.fCTM, this->getLocalMatrix()); 270 if (rec.fLocalM) { 271 matrix.preConcat(*rec.fLocalM); 272 } 273 274 if (!matrix.invert(&matrix)) { 275 return false; 276 } 277 auto quality = rec.fPaint.getFilterQuality(); 278 279 SkBitmapProvider provider(fImage.get(), rec.fDstCS); 280 SkDefaultBitmapController controller; 281 std::unique_ptr<SkBitmapController::State> state { 282 controller.requestBitmap(provider, matrix, quality) 283 }; 284 if (!state) { 285 return false; 286 } 287 288 const SkPixmap& pm = state->pixmap(); 289 matrix = state->invMatrix(); 290 quality = state->quality(); 291 auto info = pm.info(); 292 293 // When the matrix is just an integer translate, bilerp == nearest neighbor. 294 if (quality == kLow_SkFilterQuality && 295 matrix.getType() <= SkMatrix::kTranslate_Mask && 296 matrix.getTranslateX() == (int)matrix.getTranslateX() && 297 matrix.getTranslateY() == (int)matrix.getTranslateY()) { 298 quality = kNone_SkFilterQuality; 299 } 300 301 // See skia:4649 and the GM image_scale_aligned. 302 if (quality == kNone_SkFilterQuality) { 303 if (matrix.getScaleX() >= 0) { 304 matrix.setTranslateX(nextafterf(matrix.getTranslateX(), 305 floorf(matrix.getTranslateX()))); 306 } 307 if (matrix.getScaleY() >= 0) { 308 matrix.setTranslateY(nextafterf(matrix.getTranslateY(), 309 floorf(matrix.getTranslateY()))); 310 } 311 } 312 313 p->append(SkRasterPipeline::seed_shader); 314 315 struct MiscCtx { 316 std::unique_ptr<SkBitmapController::State> state; 317 SkColor4f paint_color; 318 }; 319 auto misc = alloc->make<MiscCtx>(); 320 misc->state = std::move(state); // Extend lifetime to match the pipeline's. 321 misc->paint_color = SkColor4f_from_SkColor(rec.fPaint.getColor(), rec.fDstCS); 322 p->append_matrix(alloc, matrix); 323 324 auto gather = alloc->make<SkJumper_GatherCtx>(); 325 gather->pixels = pm.writable_addr(); // Don't worry, we won't write to it. 326 gather->stride = pm.rowBytesAsPixels(); 327 gather->width = pm.width(); 328 gather->height = pm.height(); 329 330 auto limit_x = alloc->make<SkJumper_TileCtx>(), 331 limit_y = alloc->make<SkJumper_TileCtx>(); 332 limit_x->scale = pm.width(); 333 limit_x->invScale = 1.0f / pm.width(); 334 limit_y->scale = pm.height(); 335 limit_y->invScale = 1.0f / pm.height(); 336 337 auto append_tiling_and_gather = [&] { 338 switch (fTileModeX) { 339 case kClamp_TileMode: /* The gather_xxx stage will clamp for us. */ break; 340 case kMirror_TileMode: p->append(SkRasterPipeline::mirror_x, limit_x); break; 341 case kRepeat_TileMode: p->append(SkRasterPipeline::repeat_x, limit_x); break; 342 } 343 switch (fTileModeY) { 344 case kClamp_TileMode: /* The gather_xxx stage will clamp for us. */ break; 345 case kMirror_TileMode: p->append(SkRasterPipeline::mirror_y, limit_y); break; 346 case kRepeat_TileMode: p->append(SkRasterPipeline::repeat_y, limit_y); break; 347 } 348 switch (info.colorType()) { 349 case kAlpha_8_SkColorType: p->append(SkRasterPipeline::gather_a8, gather); break; 350 case kGray_8_SkColorType: p->append(SkRasterPipeline::gather_g8, gather); break; 351 case kRGB_565_SkColorType: p->append(SkRasterPipeline::gather_565, gather); break; 352 case kARGB_4444_SkColorType: p->append(SkRasterPipeline::gather_4444, gather); break; 353 case kBGRA_8888_SkColorType: p->append(SkRasterPipeline::gather_bgra, gather); break; 354 case kRGBA_8888_SkColorType: p->append(SkRasterPipeline::gather_8888, gather); break; 355 case kRGBA_F16_SkColorType: p->append(SkRasterPipeline::gather_f16, gather); break; 356 default: SkASSERT(false); 357 } 358 if (rec.fDstCS && (!info.colorSpace() || info.gammaCloseToSRGB())) { 359 p->append_from_srgb(info.alphaType()); 360 } 361 }; 362 363 SkJumper_SamplerCtx* sampler = nullptr; 364 if (quality != kNone_SkFilterQuality) { 365 sampler = alloc->make<SkJumper_SamplerCtx>(); 366 } 367 368 auto sample = [&](SkRasterPipeline::StockStage setup_x, 369 SkRasterPipeline::StockStage setup_y) { 370 p->append(setup_x, sampler); 371 p->append(setup_y, sampler); 372 append_tiling_and_gather(); 373 p->append(SkRasterPipeline::accumulate, sampler); 374 }; 375 376 if (quality == kNone_SkFilterQuality) { 377 append_tiling_and_gather(); 378 } else if (quality == kLow_SkFilterQuality) { 379 p->append(SkRasterPipeline::save_xy, sampler); 380 381 sample(SkRasterPipeline::bilinear_nx, SkRasterPipeline::bilinear_ny); 382 sample(SkRasterPipeline::bilinear_px, SkRasterPipeline::bilinear_ny); 383 sample(SkRasterPipeline::bilinear_nx, SkRasterPipeline::bilinear_py); 384 sample(SkRasterPipeline::bilinear_px, SkRasterPipeline::bilinear_py); 385 386 p->append(SkRasterPipeline::move_dst_src); 387 } else { 388 p->append(SkRasterPipeline::save_xy, sampler); 389 390 sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_n3y); 391 sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_n3y); 392 sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_n3y); 393 sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_n3y); 394 395 sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_n1y); 396 sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_n1y); 397 sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_n1y); 398 sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_n1y); 399 400 sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_p1y); 401 sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_p1y); 402 sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_p1y); 403 sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_p1y); 404 405 sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_p3y); 406 sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_p3y); 407 sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_p3y); 408 sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_p3y); 409 410 p->append(SkRasterPipeline::move_dst_src); 411 } 412 413 if (info.colorType() == kAlpha_8_SkColorType) { 414 p->append(SkRasterPipeline::set_rgb, &misc->paint_color); 415 } 416 if (info.colorType() == kAlpha_8_SkColorType || info.alphaType() == kUnpremul_SkAlphaType) { 417 p->append(SkRasterPipeline::premul); 418 } 419 if (quality > kLow_SkFilterQuality) { 420 // Bicubic filtering naturally produces out of range values on both sides. 421 p->append(SkRasterPipeline::clamp_0); 422 p->append(SkRasterPipeline::clamp_a); 423 } 424 append_gamut_transform(p, alloc, info.colorSpace(), rec.fDstCS, kPremul_SkAlphaType); 425 return true; 426} 427