SkImageShader.cpp revision 1cb41717bc4a44272eab48bd47ca7579425dc22e
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 "GrColorSpaceXform.h" 170#include "GrContext.h" 171#include "effects/GrSimpleTextureEffect.h" 172#include "effects/GrBicubicEffect.h" 173#include "effects/GrSimpleTextureEffect.h" 174 175static GrSamplerState::WrapMode tile_mode_to_wrap_mode(const SkShader::TileMode tileMode) { 176 switch (tileMode) { 177 case SkShader::TileMode::kClamp_TileMode: 178 return GrSamplerState::WrapMode::kClamp; 179 case SkShader::TileMode::kRepeat_TileMode: 180 return GrSamplerState::WrapMode::kRepeat; 181 case SkShader::TileMode::kMirror_TileMode: 182 return GrSamplerState::WrapMode::kMirrorRepeat; 183 } 184 SK_ABORT("Unknown tile mode."); 185 return GrSamplerState::WrapMode::kClamp; 186} 187 188std::unique_ptr<GrFragmentProcessor> SkImageShader::asFragmentProcessor( 189 const AsFPArgs& args) const { 190 SkMatrix lmInverse; 191 if (!this->getLocalMatrix().invert(&lmInverse)) { 192 return nullptr; 193 } 194 if (args.fLocalMatrix) { 195 SkMatrix inv; 196 if (!args.fLocalMatrix->invert(&inv)) { 197 return nullptr; 198 } 199 lmInverse.postConcat(inv); 200 } 201 202 GrSamplerState::WrapMode wrapModes[] = {tile_mode_to_wrap_mode(fTileModeX), 203 tile_mode_to_wrap_mode(fTileModeY)}; 204 205 // Must set wrap and filter on the sampler before requesting a texture. In two places below 206 // we check the matrix scale factors to determine how to interpret the filter quality setting. 207 // This completely ignores the complexity of the drawVertices case where explicit local coords 208 // are provided by the caller. 209 bool doBicubic; 210 GrSamplerState::Filter textureFilterMode = GrSkFilterQualityToGrFilterMode( 211 args.fFilterQuality, *args.fViewMatrix, this->getLocalMatrix(), &doBicubic); 212 GrSamplerState samplerState(wrapModes, textureFilterMode); 213 sk_sp<SkColorSpace> texColorSpace; 214 SkScalar scaleAdjust[2] = { 1.0f, 1.0f }; 215 sk_sp<GrTextureProxy> proxy(as_IB(fImage)->asTextureProxyRef( 216 args.fContext, samplerState, args.fDstColorSpace, &texColorSpace, scaleAdjust)); 217 if (!proxy) { 218 return nullptr; 219 } 220 221 bool isAlphaOnly = GrPixelConfigIsAlphaOnly(proxy->config()); 222 223 lmInverse.postScale(scaleAdjust[0], scaleAdjust[1]); 224 225 std::unique_ptr<GrFragmentProcessor> inner; 226 if (doBicubic) { 227 inner = GrBicubicEffect::Make(std::move(proxy), lmInverse, wrapModes); 228 } else { 229 inner = GrSimpleTextureEffect::Make(std::move(proxy), lmInverse, samplerState); 230 } 231 inner = GrColorSpaceXformEffect::Make(std::move(inner), texColorSpace.get(), 232 args.fDstColorSpace); 233 if (isAlphaOnly) { 234 return inner; 235 } 236 return GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner)); 237} 238 239#endif 240 241/////////////////////////////////////////////////////////////////////////////////////////////////// 242#include "SkImagePriv.h" 243 244sk_sp<SkShader> SkMakeBitmapShader(const SkBitmap& src, SkShader::TileMode tmx, 245 SkShader::TileMode tmy, const SkMatrix* localMatrix, 246 SkCopyPixelsMode cpm) { 247 return SkImageShader::Make(SkMakeImageFromRasterBitmap(src, cpm), 248 tmx, tmy, localMatrix); 249} 250 251static sk_sp<SkFlattenable> SkBitmapProcShader_CreateProc(SkReadBuffer& buffer) { 252 SkMatrix lm; 253 buffer.readMatrix(&lm); 254 sk_sp<SkImage> image = buffer.readBitmapAsImage(); 255 SkShader::TileMode mx = (SkShader::TileMode)buffer.readUInt(); 256 SkShader::TileMode my = (SkShader::TileMode)buffer.readUInt(); 257 return image ? image->makeShader(mx, my, &lm) : nullptr; 258} 259 260SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkShaderBase) 261SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkImageShader) 262SkFlattenable::Register("SkBitmapProcShader", SkBitmapProcShader_CreateProc, kSkShaderBase_Type); 263SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END 264 265 266bool SkImageShader::onAppendStages(const StageRec& rec) const { 267 SkRasterPipeline* p = rec.fPipeline; 268 SkArenaAlloc* alloc = rec.fAlloc; 269 270 auto matrix = SkMatrix::Concat(rec.fCTM, this->getLocalMatrix()); 271 if (rec.fLocalM) { 272 matrix.preConcat(*rec.fLocalM); 273 } 274 275 if (!matrix.invert(&matrix)) { 276 return false; 277 } 278 auto quality = rec.fPaint.getFilterQuality(); 279 280 SkBitmapProvider provider(fImage.get(), rec.fDstCS); 281 SkDefaultBitmapController controller; 282 std::unique_ptr<SkBitmapController::State> state { 283 controller.requestBitmap(provider, matrix, quality) 284 }; 285 if (!state) { 286 return false; 287 } 288 289 const SkPixmap& pm = state->pixmap(); 290 matrix = state->invMatrix(); 291 quality = state->quality(); 292 auto info = pm.info(); 293 294 // When the matrix is just an integer translate, bilerp == nearest neighbor. 295 if (quality == kLow_SkFilterQuality && 296 matrix.getType() <= SkMatrix::kTranslate_Mask && 297 matrix.getTranslateX() == (int)matrix.getTranslateX() && 298 matrix.getTranslateY() == (int)matrix.getTranslateY()) { 299 quality = kNone_SkFilterQuality; 300 } 301 302 // See skia:4649 and the GM image_scale_aligned. 303 if (quality == kNone_SkFilterQuality) { 304 if (matrix.getScaleX() >= 0) { 305 matrix.setTranslateX(nextafterf(matrix.getTranslateX(), 306 floorf(matrix.getTranslateX()))); 307 } 308 if (matrix.getScaleY() >= 0) { 309 matrix.setTranslateY(nextafterf(matrix.getTranslateY(), 310 floorf(matrix.getTranslateY()))); 311 } 312 } 313 314 p->append_seed_shader(); 315 316 struct MiscCtx { 317 std::unique_ptr<SkBitmapController::State> state; 318 SkColor4f paint_color; 319 }; 320 auto misc = alloc->make<MiscCtx>(); 321 misc->state = std::move(state); // Extend lifetime to match the pipeline's. 322 misc->paint_color = SkColor4f_from_SkColor(rec.fPaint.getColor(), rec.fDstCS); 323 p->append_matrix(alloc, matrix); 324 325 auto gather = alloc->make<SkJumper_GatherCtx>(); 326 gather->pixels = pm.writable_addr(); // Don't worry, we won't write to it. 327 gather->stride = pm.rowBytesAsPixels(); 328 gather->width = pm.width(); 329 gather->height = pm.height(); 330 331 auto limit_x = alloc->make<SkJumper_TileCtx>(), 332 limit_y = alloc->make<SkJumper_TileCtx>(); 333 limit_x->scale = pm.width(); 334 limit_x->invScale = 1.0f / pm.width(); 335 limit_y->scale = pm.height(); 336 limit_y->invScale = 1.0f / pm.height(); 337 338 auto append_tiling_and_gather = [&] { 339 switch (fTileModeX) { 340 case kClamp_TileMode: /* The gather_xxx stage will clamp for us. */ break; 341 case kMirror_TileMode: p->append(SkRasterPipeline::mirror_x, limit_x); break; 342 case kRepeat_TileMode: p->append(SkRasterPipeline::repeat_x, limit_x); break; 343 } 344 switch (fTileModeY) { 345 case kClamp_TileMode: /* The gather_xxx stage will clamp for us. */ break; 346 case kMirror_TileMode: p->append(SkRasterPipeline::mirror_y, limit_y); break; 347 case kRepeat_TileMode: p->append(SkRasterPipeline::repeat_y, limit_y); break; 348 } 349 switch (info.colorType()) { 350 case kAlpha_8_SkColorType: p->append(SkRasterPipeline::gather_a8, gather); break; 351 case kGray_8_SkColorType: p->append(SkRasterPipeline::gather_g8, gather); break; 352 case kRGB_565_SkColorType: p->append(SkRasterPipeline::gather_565, gather); break; 353 case kARGB_4444_SkColorType: p->append(SkRasterPipeline::gather_4444, gather); break; 354 case kBGRA_8888_SkColorType: p->append(SkRasterPipeline::gather_bgra, gather); break; 355 case kRGBA_8888_SkColorType: p->append(SkRasterPipeline::gather_8888, gather); break; 356 case kRGBA_F16_SkColorType: p->append(SkRasterPipeline::gather_f16, gather); break; 357 default: SkASSERT(false); 358 } 359 if (rec.fDstCS && (!info.colorSpace() || info.gammaCloseToSRGB())) { 360 p->append_from_srgb(info.alphaType()); 361 } 362 }; 363 364 SkJumper_SamplerCtx* sampler = nullptr; 365 if (quality != kNone_SkFilterQuality) { 366 sampler = alloc->make<SkJumper_SamplerCtx>(); 367 } 368 369 auto sample = [&](SkRasterPipeline::StockStage setup_x, 370 SkRasterPipeline::StockStage setup_y) { 371 p->append(setup_x, sampler); 372 p->append(setup_y, sampler); 373 append_tiling_and_gather(); 374 p->append(SkRasterPipeline::accumulate, sampler); 375 }; 376 377 if (quality == kNone_SkFilterQuality) { 378 append_tiling_and_gather(); 379 } else if (quality == kLow_SkFilterQuality) { 380 p->append(SkRasterPipeline::save_xy, sampler); 381 382 sample(SkRasterPipeline::bilinear_nx, SkRasterPipeline::bilinear_ny); 383 sample(SkRasterPipeline::bilinear_px, SkRasterPipeline::bilinear_ny); 384 sample(SkRasterPipeline::bilinear_nx, SkRasterPipeline::bilinear_py); 385 sample(SkRasterPipeline::bilinear_px, SkRasterPipeline::bilinear_py); 386 387 p->append(SkRasterPipeline::move_dst_src); 388 } else { 389 p->append(SkRasterPipeline::save_xy, sampler); 390 391 sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_n3y); 392 sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_n3y); 393 sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_n3y); 394 sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_n3y); 395 396 sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_n1y); 397 sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_n1y); 398 sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_n1y); 399 sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_n1y); 400 401 sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_p1y); 402 sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_p1y); 403 sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_p1y); 404 sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_p1y); 405 406 sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_p3y); 407 sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_p3y); 408 sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_p3y); 409 sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_p3y); 410 411 p->append(SkRasterPipeline::move_dst_src); 412 } 413 414 if (info.colorType() == kAlpha_8_SkColorType) { 415 p->append(SkRasterPipeline::set_rgb, &misc->paint_color); 416 } 417 if (info.colorType() == kAlpha_8_SkColorType || info.alphaType() == kUnpremul_SkAlphaType) { 418 p->append(SkRasterPipeline::premul); 419 } 420 if (quality > kLow_SkFilterQuality) { 421 // Bicubic filtering naturally produces out of range values on both sides. 422 p->append(SkRasterPipeline::clamp_0); 423 p->append(SkRasterPipeline::clamp_a); 424 } 425 append_gamut_transform(p, alloc, info.colorSpace(), rec.fDstCS, kPremul_SkAlphaType); 426 return true; 427} 428