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 "SkColorSpacePriv.h" 13 #include "SkColorSpaceXformSteps.h" 14 #include "SkEmptyShader.h" 15 #include "SkImage_Base.h" 16 #include "SkImageShader.h" 17 #include "SkReadBuffer.h" 18 #include "SkWriteBuffer.h" 19 20 /** 21 * We are faster in clamp, so always use that tiling when we can. 22 */ 23 static 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 34 SkImageShader::SkImageShader(sk_sp<SkImage> img, 35 TileMode tmx, TileMode tmy, 36 const SkMatrix* localMatrix, 37 bool clampAsIfUnpremul) 38 : INHERITED(localMatrix) 39 , fImage(std::move(img)) 40 , fTileModeX(optimize(tmx, fImage->width())) 41 , fTileModeY(optimize(tmy, fImage->height())) 42 , fClampAsIfUnpremul(clampAsIfUnpremul) 43 {} 44 45 // fClampAsIfUnpremul is always false when constructed through public APIs, 46 // so there's no need to read or write it here. 47 48 sk_sp<SkFlattenable> SkImageShader::CreateProc(SkReadBuffer& buffer) { 49 const TileMode tx = (TileMode)buffer.readUInt(); 50 const TileMode ty = (TileMode)buffer.readUInt(); 51 SkMatrix localMatrix; 52 buffer.readMatrix(&localMatrix); 53 sk_sp<SkImage> img = buffer.readImage(); 54 if (!img) { 55 return nullptr; 56 } 57 return SkImageShader::Make(std::move(img), tx, ty, &localMatrix); 58 } 59 60 void SkImageShader::flatten(SkWriteBuffer& buffer) const { 61 buffer.writeUInt(fTileModeX); 62 buffer.writeUInt(fTileModeY); 63 buffer.writeMatrix(this->getLocalMatrix()); 64 buffer.writeImage(fImage.get()); 65 SkASSERT(fClampAsIfUnpremul == false); 66 } 67 68 bool SkImageShader::isOpaque() const { 69 return fImage->isOpaque() && fTileModeX != kDecal_TileMode && fTileModeY != kDecal_TileMode; 70 } 71 72 #ifdef SK_ENABLE_LEGACY_SHADERCONTEXT 73 static bool legacy_shader_can_handle(const SkMatrix& inv) { 74 if (!inv.isScaleTranslate()) { 75 return false; 76 } 77 78 // legacy code uses SkFixed 32.32, so ensure the inverse doesn't map device coordinates 79 // out of range. 80 const SkScalar max_dev_coord = 32767.0f; 81 SkRect src; 82 SkAssertResult(inv.mapRect(&src, SkRect::MakeWH(max_dev_coord, max_dev_coord))); 83 84 // take 1/4 of max signed 32bits so we have room to subtract local values 85 const SkScalar max_fixed32dot32 = SK_MaxS32 * 0.25f; 86 if (!SkRect::MakeLTRB(-max_fixed32dot32, -max_fixed32dot32, 87 max_fixed32dot32, max_fixed32dot32).contains(src)) { 88 return false; 89 } 90 91 // legacy shader impl should be able to handle these matrices 92 return true; 93 } 94 95 SkShaderBase::Context* SkImageShader::onMakeContext(const ContextRec& rec, 96 SkArenaAlloc* alloc) const { 97 if (fImage->alphaType() == kUnpremul_SkAlphaType) { 98 return nullptr; 99 } 100 if (fImage->colorType() != kN32_SkColorType) { 101 return nullptr; 102 } 103 if (fTileModeX != fTileModeY) { 104 return nullptr; 105 } 106 if (fTileModeX == kDecal_TileMode || fTileModeY == kDecal_TileMode) { 107 return nullptr; 108 } 109 110 // SkBitmapProcShader stores bitmap coordinates in a 16bit buffer, 111 // so it can't handle bitmaps larger than 65535. 112 // 113 // We back off another bit to 32767 to make small amounts of 114 // intermediate math safe, e.g. in 115 // 116 // SkFixed fx = ...; 117 // fx = tile(fx + SK_Fixed1); 118 // 119 // we want to make sure (fx + SK_Fixed1) never overflows. 120 if (fImage-> width() > 32767 || 121 fImage->height() > 32767) { 122 return nullptr; 123 } 124 125 SkMatrix inv; 126 if (!this->computeTotalInverse(*rec.fMatrix, rec.fLocalMatrix, &inv) || 127 !legacy_shader_can_handle(inv)) { 128 return nullptr; 129 } 130 131 return SkBitmapProcLegacyShader::MakeContext(*this, fTileModeX, fTileModeY, 132 SkBitmapProvider(fImage.get()), rec, alloc); 133 } 134 #endif 135 136 SkImage* SkImageShader::onIsAImage(SkMatrix* texM, TileMode xy[]) const { 137 if (texM) { 138 *texM = this->getLocalMatrix(); 139 } 140 if (xy) { 141 xy[0] = (TileMode)fTileModeX; 142 xy[1] = (TileMode)fTileModeY; 143 } 144 return const_cast<SkImage*>(fImage.get()); 145 } 146 147 sk_sp<SkShader> SkImageShader::Make(sk_sp<SkImage> image, 148 TileMode tx, TileMode ty, 149 const SkMatrix* localMatrix, 150 bool clampAsIfUnpremul) { 151 if (!image) { 152 return sk_make_sp<SkEmptyShader>(); 153 } 154 return sk_sp<SkShader>{ new SkImageShader(image, tx,ty, localMatrix, clampAsIfUnpremul) }; 155 } 156 157 /////////////////////////////////////////////////////////////////////////////////////////////////// 158 159 #if SK_SUPPORT_GPU 160 161 #include "GrColorSpaceInfo.h" 162 #include "GrContext.h" 163 #include "GrContextPriv.h" 164 #include "SkGr.h" 165 #include "effects/GrBicubicEffect.h" 166 #include "effects/GrSimpleTextureEffect.h" 167 168 static GrSamplerState::WrapMode tile_mode_to_wrap_mode(const SkShader::TileMode tileMode) { 169 switch (tileMode) { 170 case SkShader::TileMode::kClamp_TileMode: 171 return GrSamplerState::WrapMode::kClamp; 172 case SkShader::TileMode::kRepeat_TileMode: 173 return GrSamplerState::WrapMode::kRepeat; 174 case SkShader::TileMode::kMirror_TileMode: 175 return GrSamplerState::WrapMode::kMirrorRepeat; 176 case SkShader::kDecal_TileMode: 177 return GrSamplerState::WrapMode::kClampToBorder; 178 } 179 SK_ABORT("Unknown tile mode."); 180 return GrSamplerState::WrapMode::kClamp; 181 } 182 183 std::unique_ptr<GrFragmentProcessor> SkImageShader::asFragmentProcessor( 184 const GrFPArgs& args) const { 185 const auto lm = this->totalLocalMatrix(args.fPreLocalMatrix, args.fPostLocalMatrix); 186 SkMatrix lmInverse; 187 if (!lm->invert(&lmInverse)) { 188 return nullptr; 189 } 190 191 GrSamplerState::WrapMode wrapModes[] = {tile_mode_to_wrap_mode(fTileModeX), 192 tile_mode_to_wrap_mode(fTileModeY)}; 193 194 // If either domainX or domainY are un-ignored, a texture domain effect has to be used to 195 // implement the decal mode (while leaving non-decal axes alone). The wrap mode originally 196 // clamp-to-border is reset to clamp since the hw cannot implement it directly. 197 GrTextureDomain::Mode domainX = GrTextureDomain::kIgnore_Mode; 198 GrTextureDomain::Mode domainY = GrTextureDomain::kIgnore_Mode; 199 if (!args.fContext->contextPriv().caps()->clampToBorderSupport()) { 200 if (wrapModes[0] == GrSamplerState::WrapMode::kClampToBorder) { 201 domainX = GrTextureDomain::kDecal_Mode; 202 wrapModes[0] = GrSamplerState::WrapMode::kClamp; 203 } 204 if (wrapModes[1] == GrSamplerState::WrapMode::kClampToBorder) { 205 domainY = GrTextureDomain::kDecal_Mode; 206 wrapModes[1] = GrSamplerState::WrapMode::kClamp; 207 } 208 } 209 210 // Must set wrap and filter on the sampler before requesting a texture. In two places below 211 // we check the matrix scale factors to determine how to interpret the filter quality setting. 212 // This completely ignores the complexity of the drawVertices case where explicit local coords 213 // are provided by the caller. 214 bool doBicubic; 215 GrSamplerState::Filter textureFilterMode = GrSkFilterQualityToGrFilterMode( 216 args.fFilterQuality, *args.fViewMatrix, *lm, 217 args.fContext->contextPriv().sharpenMipmappedTextures(), &doBicubic); 218 GrSamplerState samplerState(wrapModes, textureFilterMode); 219 SkScalar scaleAdjust[2] = { 1.0f, 1.0f }; 220 sk_sp<GrTextureProxy> proxy(as_IB(fImage)->asTextureProxyRef(args.fContext, samplerState, 221 scaleAdjust)); 222 if (!proxy) { 223 return nullptr; 224 } 225 226 GrPixelConfig config = proxy->config(); 227 bool isAlphaOnly = GrPixelConfigIsAlphaOnly(config); 228 229 lmInverse.postScale(scaleAdjust[0], scaleAdjust[1]); 230 231 std::unique_ptr<GrFragmentProcessor> inner; 232 if (doBicubic) { 233 // domainX and domainY will properly apply the decal effect with the texture domain used in 234 // the bicubic filter if clamp to border was unsupported in hardware 235 inner = GrBicubicEffect::Make(std::move(proxy), lmInverse, wrapModes, domainX, domainY); 236 } else { 237 if (domainX != GrTextureDomain::kIgnore_Mode || domainY != GrTextureDomain::kIgnore_Mode) { 238 SkRect domain = GrTextureDomain::MakeTexelDomain( 239 SkIRect::MakeWH(proxy->width(), proxy->height()), 240 domainX, domainY); 241 inner = GrTextureDomainEffect::Make(std::move(proxy), lmInverse, domain, 242 domainX, domainY, samplerState); 243 } else { 244 inner = GrSimpleTextureEffect::Make(std::move(proxy), lmInverse, samplerState); 245 } 246 } 247 inner = GrColorSpaceXformEffect::Make(std::move(inner), fImage->colorSpace(), 248 fImage->alphaType(), 249 args.fDstColorSpaceInfo->colorSpace()); 250 if (isAlphaOnly) { 251 return inner; 252 } 253 return GrFragmentProcessor::MulChildByInputAlpha(std::move(inner)); 254 } 255 256 #endif 257 258 /////////////////////////////////////////////////////////////////////////////////////////////////// 259 #include "SkImagePriv.h" 260 261 sk_sp<SkShader> SkMakeBitmapShader(const SkBitmap& src, SkShader::TileMode tmx, 262 SkShader::TileMode tmy, const SkMatrix* localMatrix, 263 SkCopyPixelsMode cpm) { 264 return SkImageShader::Make(SkMakeImageFromRasterBitmap(src, cpm), 265 tmx, tmy, localMatrix); 266 } 267 268 void SkShaderBase::RegisterFlattenables() { SK_REGISTER_FLATTENABLE(SkImageShader); } 269 270 bool SkImageShader::onAppendStages(const StageRec& rec) const { 271 SkRasterPipeline* p = rec.fPipeline; 272 SkArenaAlloc* alloc = rec.fAlloc; 273 274 SkMatrix matrix; 275 if (!this->computeTotalInverse(rec.fCTM, rec.fLocalM, &matrix)) { 276 return false; 277 } 278 auto quality = rec.fPaint.getFilterQuality(); 279 280 SkBitmapProvider provider(fImage.get()); 281 const auto* state = SkBitmapController::RequestBitmap(provider, matrix, quality, alloc); 282 if (!state) { 283 return false; 284 } 285 286 const SkPixmap& pm = state->pixmap(); 287 matrix = state->invMatrix(); 288 quality = state->quality(); 289 auto info = pm.info(); 290 291 // When the matrix is just an integer translate, bilerp == nearest neighbor. 292 if (quality == kLow_SkFilterQuality && 293 matrix.getType() <= SkMatrix::kTranslate_Mask && 294 matrix.getTranslateX() == (int)matrix.getTranslateX() && 295 matrix.getTranslateY() == (int)matrix.getTranslateY()) { 296 quality = kNone_SkFilterQuality; 297 } 298 299 // See skia:4649 and the GM image_scale_aligned. 300 if (quality == kNone_SkFilterQuality) { 301 if (matrix.getScaleX() >= 0) { 302 matrix.setTranslateX(nextafterf(matrix.getTranslateX(), 303 floorf(matrix.getTranslateX()))); 304 } 305 if (matrix.getScaleY() >= 0) { 306 matrix.setTranslateY(nextafterf(matrix.getTranslateY(), 307 floorf(matrix.getTranslateY()))); 308 } 309 } 310 311 p->append(SkRasterPipeline::seed_shader); 312 p->append_matrix(alloc, matrix); 313 314 auto gather = alloc->make<SkRasterPipeline_GatherCtx>(); 315 gather->pixels = pm.addr(); 316 gather->stride = pm.rowBytesAsPixels(); 317 gather->width = pm.width(); 318 gather->height = pm.height(); 319 320 auto limit_x = alloc->make<SkRasterPipeline_TileCtx>(), 321 limit_y = alloc->make<SkRasterPipeline_TileCtx>(); 322 limit_x->scale = pm.width(); 323 limit_x->invScale = 1.0f / pm.width(); 324 limit_y->scale = pm.height(); 325 limit_y->invScale = 1.0f / pm.height(); 326 327 SkRasterPipeline_DecalTileCtx* decal_ctx = nullptr; 328 bool decal_x_and_y = fTileModeX == kDecal_TileMode && fTileModeY == kDecal_TileMode; 329 if (fTileModeX == kDecal_TileMode || fTileModeY == kDecal_TileMode) { 330 decal_ctx = alloc->make<SkRasterPipeline_DecalTileCtx>(); 331 decal_ctx->limit_x = limit_x->scale; 332 decal_ctx->limit_y = limit_y->scale; 333 } 334 335 auto append_tiling_and_gather = [&] { 336 if (decal_x_and_y) { 337 p->append(SkRasterPipeline::decal_x_and_y, decal_ctx); 338 } else { 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 case kDecal_TileMode: p->append(SkRasterPipeline::decal_x, decal_ctx); break; 344 } 345 switch (fTileModeY) { 346 case kClamp_TileMode: /* The gather_xxx stage will clamp for us. */ break; 347 case kMirror_TileMode: p->append(SkRasterPipeline::mirror_y, limit_y); break; 348 case kRepeat_TileMode: p->append(SkRasterPipeline::repeat_y, limit_y); break; 349 case kDecal_TileMode: p->append(SkRasterPipeline::decal_y, decal_ctx); break; 350 } 351 } 352 353 void* ctx = gather; 354 switch (info.colorType()) { 355 case kAlpha_8_SkColorType: p->append(SkRasterPipeline::gather_a8, ctx); break; 356 case kRGB_565_SkColorType: p->append(SkRasterPipeline::gather_565, ctx); break; 357 case kARGB_4444_SkColorType: p->append(SkRasterPipeline::gather_4444, ctx); break; 358 case kRGBA_8888_SkColorType: p->append(SkRasterPipeline::gather_8888, ctx); break; 359 case kRGBA_1010102_SkColorType: p->append(SkRasterPipeline::gather_1010102, ctx); break; 360 case kRGBA_F16_SkColorType: p->append(SkRasterPipeline::gather_f16, ctx); break; 361 case kRGBA_F32_SkColorType: p->append(SkRasterPipeline::gather_f32, ctx); break; 362 363 case kGray_8_SkColorType: p->append(SkRasterPipeline::gather_a8, ctx); 364 p->append(SkRasterPipeline::alpha_to_gray ); break; 365 366 case kRGB_888x_SkColorType: p->append(SkRasterPipeline::gather_8888, ctx); 367 p->append(SkRasterPipeline::force_opaque ); break; 368 369 case kRGB_101010x_SkColorType: p->append(SkRasterPipeline::gather_1010102, ctx); 370 p->append(SkRasterPipeline::force_opaque ); break; 371 372 case kBGRA_8888_SkColorType: p->append(SkRasterPipeline::gather_8888, ctx); 373 p->append(SkRasterPipeline::swap_rb ); break; 374 375 default: SkASSERT(false); 376 } 377 if (decal_ctx) { 378 p->append(SkRasterPipeline::check_decal_mask, decal_ctx); 379 } 380 }; 381 382 auto append_misc = [&] { 383 // TODO: if ref.fDstCS isn't null, we'll premul here then immediately unpremul 384 // to do the color space transformation. Might be possible to streamline. 385 if (info.colorType() == kAlpha_8_SkColorType) { 386 // The color for A8 images comes from the (sRGB) paint color. 387 p->append_set_rgb(alloc, rec.fPaint.getColor4f()); 388 p->append(SkRasterPipeline::premul); 389 } else if (info.alphaType() == kUnpremul_SkAlphaType) { 390 // Convert unpremul images to premul before we carry on with the rest of the pipeline. 391 p->append(SkRasterPipeline::premul); 392 } 393 394 if (quality > kLow_SkFilterQuality) { 395 // Bicubic filtering naturally produces out of range values on both sides. 396 p->append(SkRasterPipeline::clamp_0); 397 p->append(fClampAsIfUnpremul ? SkRasterPipeline::clamp_1 398 : SkRasterPipeline::clamp_a); 399 } 400 401 if (rec.fDstCS) { 402 // If color managed, convert from premul source all the way to premul dst color space. 403 auto srcCS = info.colorSpace(); 404 if (!srcCS || info.colorType() == kAlpha_8_SkColorType) { 405 // We treat untagged images as sRGB. 406 // A8 images get their r,g,b from the paint color, so they're also sRGB. 407 srcCS = sk_srgb_singleton(); 408 } 409 alloc->make<SkColorSpaceXformSteps>(srcCS , kPremul_SkAlphaType, 410 rec.fDstCS, kPremul_SkAlphaType) 411 ->apply(p, info.colorType()); 412 } 413 414 return true; 415 }; 416 417 // We've got a fast path for 8888 bilinear clamp/clamp sampling. 418 auto ct = info.colorType(); 419 if (true 420 && (ct == kRGBA_8888_SkColorType || ct == kBGRA_8888_SkColorType) 421 && quality == kLow_SkFilterQuality 422 && fTileModeX == SkShader::kClamp_TileMode 423 && fTileModeY == SkShader::kClamp_TileMode) { 424 425 p->append(SkRasterPipeline::bilerp_clamp_8888, gather); 426 if (ct == kBGRA_8888_SkColorType) { 427 p->append(SkRasterPipeline::swap_rb); 428 } 429 return append_misc(); 430 } 431 432 SkRasterPipeline_SamplerCtx* sampler = nullptr; 433 if (quality != kNone_SkFilterQuality) { 434 sampler = alloc->make<SkRasterPipeline_SamplerCtx>(); 435 } 436 437 auto sample = [&](SkRasterPipeline::StockStage setup_x, 438 SkRasterPipeline::StockStage setup_y) { 439 p->append(setup_x, sampler); 440 p->append(setup_y, sampler); 441 append_tiling_and_gather(); 442 p->append(SkRasterPipeline::accumulate, sampler); 443 }; 444 445 if (quality == kNone_SkFilterQuality) { 446 append_tiling_and_gather(); 447 448 } else if (quality == kLow_SkFilterQuality) { 449 p->append(SkRasterPipeline::save_xy, sampler); 450 451 sample(SkRasterPipeline::bilinear_nx, SkRasterPipeline::bilinear_ny); 452 sample(SkRasterPipeline::bilinear_px, SkRasterPipeline::bilinear_ny); 453 sample(SkRasterPipeline::bilinear_nx, SkRasterPipeline::bilinear_py); 454 sample(SkRasterPipeline::bilinear_px, SkRasterPipeline::bilinear_py); 455 456 p->append(SkRasterPipeline::move_dst_src); 457 458 } else { 459 p->append(SkRasterPipeline::save_xy, sampler); 460 461 sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_n3y); 462 sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_n3y); 463 sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_n3y); 464 sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_n3y); 465 466 sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_n1y); 467 sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_n1y); 468 sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_n1y); 469 sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_n1y); 470 471 sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_p1y); 472 sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_p1y); 473 sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_p1y); 474 sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_p1y); 475 476 sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_p3y); 477 sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_p3y); 478 sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_p3y); 479 sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_p3y); 480 481 p->append(SkRasterPipeline::move_dst_src); 482 } 483 484 return append_misc(); 485 } 486
