1 /* 2 * Copyright 2012 The Android Open Source Project 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 "SkMatrixConvolutionImageFilter.h" 9 #include "SkBitmap.h" 10 #include "SkColorPriv.h" 11 #include "SkFlattenableBuffers.h" 12 #include "SkRect.h" 13 #include "SkUnPreMultiply.h" 14 15 #if SK_SUPPORT_GPU 16 #include "gl/GrGLEffect.h" 17 #include "effects/GrSingleTextureEffect.h" 18 #include "GrTBackendEffectFactory.h" 19 #include "GrTexture.h" 20 #include "SkMatrix.h" 21 #endif 22 23 static bool tile_mode_is_valid(SkMatrixConvolutionImageFilter::TileMode tileMode) { 24 switch (tileMode) { 25 case SkMatrixConvolutionImageFilter::kClamp_TileMode: 26 case SkMatrixConvolutionImageFilter::kRepeat_TileMode: 27 case SkMatrixConvolutionImageFilter::kClampToBlack_TileMode: 28 return true; 29 default: 30 break; 31 } 32 return false; 33 } 34 35 SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter( 36 const SkISize& kernelSize, 37 const SkScalar* kernel, 38 SkScalar gain, 39 SkScalar bias, 40 const SkIPoint& target, 41 TileMode tileMode, 42 bool convolveAlpha, 43 SkImageFilter* input, 44 const CropRect* cropRect) 45 : INHERITED(input, cropRect), 46 fKernelSize(kernelSize), 47 fGain(gain), 48 fBias(bias), 49 fTarget(target), 50 fTileMode(tileMode), 51 fConvolveAlpha(convolveAlpha) { 52 uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight; 53 fKernel = SkNEW_ARRAY(SkScalar, size); 54 memcpy(fKernel, kernel, size * sizeof(SkScalar)); 55 SkASSERT(kernelSize.fWidth >= 1 && kernelSize.fHeight >= 1); 56 SkASSERT(target.fX >= 0 && target.fX < kernelSize.fWidth); 57 SkASSERT(target.fY >= 0 && target.fY < kernelSize.fHeight); 58 } 59 60 SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(SkFlattenableReadBuffer& buffer) 61 : INHERITED(1, buffer) { 62 // We need to be able to read at most SK_MaxS32 bytes, so divide that 63 // by the size of a scalar to know how many scalars we can read. 64 static const int32_t kMaxSize = SK_MaxS32 / sizeof(SkScalar); 65 fKernelSize.fWidth = buffer.readInt(); 66 fKernelSize.fHeight = buffer.readInt(); 67 if ((fKernelSize.fWidth >= 1) && (fKernelSize.fHeight >= 1) && 68 // Make sure size won't be larger than a signed int, 69 // which would still be extremely large for a kernel, 70 // but we don't impose a hard limit for kernel size 71 (kMaxSize / fKernelSize.fWidth >= fKernelSize.fHeight)) { 72 size_t size = fKernelSize.fWidth * fKernelSize.fHeight; 73 fKernel = SkNEW_ARRAY(SkScalar, size); 74 SkDEBUGCODE(bool success =) buffer.readScalarArray(fKernel, size); 75 SkASSERT(success); 76 } else { 77 fKernel = 0; 78 } 79 fGain = buffer.readScalar(); 80 fBias = buffer.readScalar(); 81 fTarget.fX = buffer.readInt(); 82 fTarget.fY = buffer.readInt(); 83 fTileMode = (TileMode) buffer.readInt(); 84 fConvolveAlpha = buffer.readBool(); 85 buffer.validate((fKernel != 0) && 86 SkScalarIsFinite(fGain) && 87 SkScalarIsFinite(fBias) && 88 tile_mode_is_valid(fTileMode)); 89 } 90 91 void SkMatrixConvolutionImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { 92 this->INHERITED::flatten(buffer); 93 buffer.writeInt(fKernelSize.fWidth); 94 buffer.writeInt(fKernelSize.fHeight); 95 buffer.writeScalarArray(fKernel, fKernelSize.fWidth * fKernelSize.fHeight); 96 buffer.writeScalar(fGain); 97 buffer.writeScalar(fBias); 98 buffer.writeInt(fTarget.fX); 99 buffer.writeInt(fTarget.fY); 100 buffer.writeInt((int) fTileMode); 101 buffer.writeBool(fConvolveAlpha); 102 } 103 104 SkMatrixConvolutionImageFilter::~SkMatrixConvolutionImageFilter() { 105 delete[] fKernel; 106 } 107 108 class UncheckedPixelFetcher { 109 public: 110 static inline SkPMColor fetch(const SkBitmap& src, int x, int y, const SkIRect& bounds) { 111 return *src.getAddr32(x, y); 112 } 113 }; 114 115 class ClampPixelFetcher { 116 public: 117 static inline SkPMColor fetch(const SkBitmap& src, int x, int y, const SkIRect& bounds) { 118 x = SkPin32(x, bounds.fLeft, bounds.fRight - 1); 119 y = SkPin32(y, bounds.fTop, bounds.fBottom - 1); 120 return *src.getAddr32(x, y); 121 } 122 }; 123 124 class RepeatPixelFetcher { 125 public: 126 static inline SkPMColor fetch(const SkBitmap& src, int x, int y, const SkIRect& bounds) { 127 x = (x - bounds.left()) % bounds.width() + bounds.left(); 128 y = (y - bounds.top()) % bounds.height() + bounds.top(); 129 if (x < bounds.left()) { 130 x += bounds.width(); 131 } 132 if (y < bounds.top()) { 133 y += bounds.height(); 134 } 135 return *src.getAddr32(x, y); 136 } 137 }; 138 139 class ClampToBlackPixelFetcher { 140 public: 141 static inline SkPMColor fetch(const SkBitmap& src, int x, int y, const SkIRect& bounds) { 142 if (x < bounds.fLeft || x >= bounds.fRight || y < bounds.fTop || y >= bounds.fBottom) { 143 return 0; 144 } else { 145 return *src.getAddr32(x, y); 146 } 147 } 148 }; 149 150 template<class PixelFetcher, bool convolveAlpha> 151 void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, 152 SkBitmap* result, 153 const SkIRect& rect, 154 const SkIRect& bounds) { 155 for (int y = rect.fTop; y < rect.fBottom; ++y) { 156 SkPMColor* dptr = result->getAddr32(rect.fLeft - bounds.fLeft, y - bounds.fTop); 157 for (int x = rect.fLeft; x < rect.fRight; ++x) { 158 SkScalar sumA = 0, sumR = 0, sumG = 0, sumB = 0; 159 for (int cy = 0; cy < fKernelSize.fHeight; cy++) { 160 for (int cx = 0; cx < fKernelSize.fWidth; cx++) { 161 SkPMColor s = PixelFetcher::fetch(src, 162 x + cx - fTarget.fX, 163 y + cy - fTarget.fY, 164 bounds); 165 SkScalar k = fKernel[cy * fKernelSize.fWidth + cx]; 166 if (convolveAlpha) { 167 sumA += SkScalarMul(SkIntToScalar(SkGetPackedA32(s)), k); 168 } 169 sumR += SkScalarMul(SkIntToScalar(SkGetPackedR32(s)), k); 170 sumG += SkScalarMul(SkIntToScalar(SkGetPackedG32(s)), k); 171 sumB += SkScalarMul(SkIntToScalar(SkGetPackedB32(s)), k); 172 } 173 } 174 int a = convolveAlpha 175 ? SkClampMax(SkScalarFloorToInt(SkScalarMul(sumA, fGain) + fBias), 255) 176 : 255; 177 int r = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumR, fGain) + fBias), a); 178 int g = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumG, fGain) + fBias), a); 179 int b = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumB, fGain) + fBias), a); 180 if (!convolveAlpha) { 181 a = SkGetPackedA32(PixelFetcher::fetch(src, x, y, bounds)); 182 *dptr++ = SkPreMultiplyARGB(a, r, g, b); 183 } else { 184 *dptr++ = SkPackARGB32(a, r, g, b); 185 } 186 } 187 } 188 } 189 190 template<class PixelFetcher> 191 void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, 192 SkBitmap* result, 193 const SkIRect& rect, 194 const SkIRect& bounds) { 195 if (fConvolveAlpha) { 196 filterPixels<PixelFetcher, true>(src, result, rect, bounds); 197 } else { 198 filterPixels<PixelFetcher, false>(src, result, rect, bounds); 199 } 200 } 201 202 void SkMatrixConvolutionImageFilter::filterInteriorPixels(const SkBitmap& src, 203 SkBitmap* result, 204 const SkIRect& rect, 205 const SkIRect& bounds) { 206 filterPixels<UncheckedPixelFetcher>(src, result, rect, bounds); 207 } 208 209 void SkMatrixConvolutionImageFilter::filterBorderPixels(const SkBitmap& src, 210 SkBitmap* result, 211 const SkIRect& rect, 212 const SkIRect& bounds) { 213 switch (fTileMode) { 214 case kClamp_TileMode: 215 filterPixels<ClampPixelFetcher>(src, result, rect, bounds); 216 break; 217 case kRepeat_TileMode: 218 filterPixels<RepeatPixelFetcher>(src, result, rect, bounds); 219 break; 220 case kClampToBlack_TileMode: 221 filterPixels<ClampToBlackPixelFetcher>(src, result, rect, bounds); 222 break; 223 } 224 } 225 226 // FIXME: This should be refactored to SkImageFilterUtils for 227 // use by other filters. For now, we assume the input is always 228 // premultiplied and unpremultiply it 229 static SkBitmap unpremultiplyBitmap(const SkBitmap& src) 230 { 231 SkAutoLockPixels alp(src); 232 if (!src.getPixels()) { 233 return SkBitmap(); 234 } 235 SkBitmap result; 236 result.setConfig(src.config(), src.width(), src.height()); 237 result.allocPixels(); 238 if (!result.getPixels()) { 239 return SkBitmap(); 240 } 241 for (int y = 0; y < src.height(); ++y) { 242 const uint32_t* srcRow = src.getAddr32(0, y); 243 uint32_t* dstRow = result.getAddr32(0, y); 244 for (int x = 0; x < src.width(); ++x) { 245 dstRow[x] = SkUnPreMultiply::PMColorToColor(srcRow[x]); 246 } 247 } 248 return result; 249 } 250 251 bool SkMatrixConvolutionImageFilter::onFilterImage(Proxy* proxy, 252 const SkBitmap& source, 253 const SkMatrix& matrix, 254 SkBitmap* result, 255 SkIPoint* loc) { 256 SkBitmap src = source; 257 if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, loc)) { 258 return false; 259 } 260 261 if (src.config() != SkBitmap::kARGB_8888_Config) { 262 return false; 263 } 264 265 SkIRect bounds; 266 src.getBounds(&bounds); 267 if (!this->applyCropRect(&bounds, matrix)) { 268 return false; 269 } 270 271 if (!fConvolveAlpha && !src.isOpaque()) { 272 src = unpremultiplyBitmap(src); 273 } 274 275 SkAutoLockPixels alp(src); 276 if (!src.getPixels()) { 277 return false; 278 } 279 280 result->setConfig(src.config(), bounds.width(), bounds.height()); 281 result->allocPixels(); 282 if (!result->getPixels()) { 283 return false; 284 } 285 286 SkIRect interior = SkIRect::MakeXYWH(bounds.left() + fTarget.fX, 287 bounds.top() + fTarget.fY, 288 bounds.width() - fKernelSize.fWidth + 1, 289 bounds.height() - fKernelSize.fHeight + 1); 290 SkIRect top = SkIRect::MakeLTRB(bounds.left(), bounds.top(), bounds.right(), interior.top()); 291 SkIRect bottom = SkIRect::MakeLTRB(bounds.left(), interior.bottom(), 292 bounds.right(), bounds.bottom()); 293 SkIRect left = SkIRect::MakeLTRB(bounds.left(), interior.top(), 294 interior.left(), interior.bottom()); 295 SkIRect right = SkIRect::MakeLTRB(interior.right(), interior.top(), 296 bounds.right(), interior.bottom()); 297 filterBorderPixels(src, result, top, bounds); 298 filterBorderPixels(src, result, left, bounds); 299 filterInteriorPixels(src, result, interior, bounds); 300 filterBorderPixels(src, result, right, bounds); 301 filterBorderPixels(src, result, bottom, bounds); 302 loc->fX += bounds.fLeft; 303 loc->fY += bounds.fTop; 304 return true; 305 } 306 307 #if SK_SUPPORT_GPU 308 309 /////////////////////////////////////////////////////////////////////////////// 310 311 class GrGLMatrixConvolutionEffect; 312 313 class GrMatrixConvolutionEffect : public GrSingleTextureEffect { 314 public: 315 typedef SkMatrixConvolutionImageFilter::TileMode TileMode; 316 static GrEffectRef* Create(GrTexture* texture, 317 const SkIRect& bounds, 318 const SkISize& kernelSize, 319 const SkScalar* kernel, 320 SkScalar gain, 321 SkScalar bias, 322 const SkIPoint& target, 323 TileMode tileMode, 324 bool convolveAlpha) { 325 AutoEffectUnref effect(SkNEW_ARGS(GrMatrixConvolutionEffect, (texture, 326 bounds, 327 kernelSize, 328 kernel, 329 gain, 330 bias, 331 target, 332 tileMode, 333 convolveAlpha))); 334 return CreateEffectRef(effect); 335 } 336 virtual ~GrMatrixConvolutionEffect(); 337 338 virtual void getConstantColorComponents(GrColor* color, 339 uint32_t* validFlags) const SK_OVERRIDE { 340 // TODO: Try to do better? 341 *validFlags = 0; 342 } 343 344 static const char* Name() { return "MatrixConvolution"; } 345 const SkIRect& bounds() const { return fBounds; } 346 const SkISize& kernelSize() const { return fKernelSize; } 347 const float* target() const { return fTarget; } 348 const float* kernel() const { return fKernel; } 349 float gain() const { return fGain; } 350 float bias() const { return fBias; } 351 TileMode tileMode() const { return fTileMode; } 352 bool convolveAlpha() const { return fConvolveAlpha; } 353 354 typedef GrGLMatrixConvolutionEffect GLEffect; 355 356 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; 357 358 private: 359 GrMatrixConvolutionEffect(GrTexture*, 360 const SkIRect& bounds, 361 const SkISize& kernelSize, 362 const SkScalar* kernel, 363 SkScalar gain, 364 SkScalar bias, 365 const SkIPoint& target, 366 TileMode tileMode, 367 bool convolveAlpha); 368 369 virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE; 370 371 SkIRect fBounds; 372 SkISize fKernelSize; 373 float *fKernel; 374 float fGain; 375 float fBias; 376 float fTarget[2]; 377 TileMode fTileMode; 378 bool fConvolveAlpha; 379 380 GR_DECLARE_EFFECT_TEST; 381 382 typedef GrSingleTextureEffect INHERITED; 383 }; 384 385 class GrGLMatrixConvolutionEffect : public GrGLEffect { 386 public: 387 GrGLMatrixConvolutionEffect(const GrBackendEffectFactory& factory, 388 const GrDrawEffect& effect); 389 virtual void emitCode(GrGLShaderBuilder*, 390 const GrDrawEffect&, 391 EffectKey, 392 const char* outputColor, 393 const char* inputColor, 394 const TransformedCoordsArray&, 395 const TextureSamplerArray&) SK_OVERRIDE; 396 397 static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&); 398 399 virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; 400 401 private: 402 typedef GrGLUniformManager::UniformHandle UniformHandle; 403 typedef SkMatrixConvolutionImageFilter::TileMode TileMode; 404 SkISize fKernelSize; 405 TileMode fTileMode; 406 bool fConvolveAlpha; 407 408 UniformHandle fBoundsUni; 409 UniformHandle fKernelUni; 410 UniformHandle fImageIncrementUni; 411 UniformHandle fTargetUni; 412 UniformHandle fGainUni; 413 UniformHandle fBiasUni; 414 415 typedef GrGLEffect INHERITED; 416 }; 417 418 GrGLMatrixConvolutionEffect::GrGLMatrixConvolutionEffect(const GrBackendEffectFactory& factory, 419 const GrDrawEffect& drawEffect) 420 : INHERITED(factory) { 421 const GrMatrixConvolutionEffect& m = drawEffect.castEffect<GrMatrixConvolutionEffect>(); 422 fKernelSize = m.kernelSize(); 423 fTileMode = m.tileMode(); 424 fConvolveAlpha = m.convolveAlpha(); 425 } 426 427 static void appendTextureLookup(GrGLShaderBuilder* builder, 428 const GrGLShaderBuilder::TextureSampler& sampler, 429 const char* coord, 430 const char* bounds, 431 SkMatrixConvolutionImageFilter::TileMode tileMode) { 432 SkString clampedCoord; 433 switch (tileMode) { 434 case SkMatrixConvolutionImageFilter::kClamp_TileMode: 435 clampedCoord.printf("clamp(%s, %s.xy, %s.zw)", coord, bounds, bounds); 436 coord = clampedCoord.c_str(); 437 break; 438 case SkMatrixConvolutionImageFilter::kRepeat_TileMode: 439 clampedCoord.printf("mod(%s - %s.xy, %s.zw - %s.xy) + %s.xy", coord, bounds, bounds, bounds, bounds); 440 coord = clampedCoord.c_str(); 441 break; 442 case SkMatrixConvolutionImageFilter::kClampToBlack_TileMode: 443 builder->fsCodeAppendf("clamp(%s, %s.xy, %s.zw) != %s ? vec4(0, 0, 0, 0) : ", coord, bounds, bounds, coord); 444 break; 445 } 446 builder->fsAppendTextureLookup(sampler, coord); 447 } 448 449 void GrGLMatrixConvolutionEffect::emitCode(GrGLShaderBuilder* builder, 450 const GrDrawEffect&, 451 EffectKey key, 452 const char* outputColor, 453 const char* inputColor, 454 const TransformedCoordsArray& coords, 455 const TextureSamplerArray& samplers) { 456 sk_ignore_unused_variable(inputColor); 457 SkString coords2D = builder->ensureFSCoords2D(coords, 0); 458 fBoundsUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, 459 kVec4f_GrSLType, "Bounds"); 460 fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, 461 kVec2f_GrSLType, "ImageIncrement"); 462 fKernelUni = builder->addUniformArray(GrGLShaderBuilder::kFragment_Visibility, 463 kFloat_GrSLType, 464 "Kernel", 465 fKernelSize.width() * fKernelSize.height()); 466 fTargetUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, 467 kVec2f_GrSLType, "Target"); 468 fGainUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, 469 kFloat_GrSLType, "Gain"); 470 fBiasUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, 471 kFloat_GrSLType, "Bias"); 472 473 const char* bounds = builder->getUniformCStr(fBoundsUni); 474 const char* target = builder->getUniformCStr(fTargetUni); 475 const char* imgInc = builder->getUniformCStr(fImageIncrementUni); 476 const char* kernel = builder->getUniformCStr(fKernelUni); 477 const char* gain = builder->getUniformCStr(fGainUni); 478 const char* bias = builder->getUniformCStr(fBiasUni); 479 int kWidth = fKernelSize.width(); 480 int kHeight = fKernelSize.height(); 481 482 builder->fsCodeAppend("\t\tvec4 sum = vec4(0, 0, 0, 0);\n"); 483 builder->fsCodeAppendf("\t\tvec2 coord = %s - %s * %s;\n", coords2D.c_str(), target, imgInc); 484 builder->fsCodeAppendf("\t\tfor (int y = 0; y < %d; y++) {\n", kHeight); 485 builder->fsCodeAppendf("\t\t\tfor (int x = 0; x < %d; x++) {\n", kWidth); 486 builder->fsCodeAppendf("\t\t\t\tfloat k = %s[y * %d + x];\n", kernel, kWidth); 487 builder->fsCodeAppendf("\t\t\t\tvec2 coord2 = coord + vec2(x, y) * %s;\n", imgInc); 488 builder->fsCodeAppend("\t\t\t\tvec4 c = "); 489 appendTextureLookup(builder, samplers[0], "coord2", bounds, fTileMode); 490 builder->fsCodeAppend(";\n"); 491 if (!fConvolveAlpha) { 492 builder->fsCodeAppend("\t\t\t\tc.rgb /= c.a;\n"); 493 } 494 builder->fsCodeAppend("\t\t\t\tsum += c * k;\n"); 495 builder->fsCodeAppend("\t\t\t}\n"); 496 builder->fsCodeAppend("\t\t}\n"); 497 if (fConvolveAlpha) { 498 builder->fsCodeAppendf("\t\t%s = sum * %s + %s;\n", outputColor, gain, bias); 499 builder->fsCodeAppendf("\t\t%s.rgb = clamp(%s.rgb, 0.0, %s.a);\n", 500 outputColor, outputColor, outputColor); 501 } else { 502 builder->fsCodeAppend("\t\tvec4 c = "); 503 appendTextureLookup(builder, samplers[0], coords2D.c_str(), bounds, fTileMode); 504 builder->fsCodeAppend(";\n"); 505 builder->fsCodeAppendf("\t\t%s.a = c.a;\n", outputColor); 506 builder->fsCodeAppendf("\t\t%s.rgb = sum.rgb * %s + %s;\n", outputColor, gain, bias); 507 builder->fsCodeAppendf("\t\t%s.rgb *= %s.a;\n", outputColor, outputColor); 508 } 509 } 510 511 namespace { 512 513 int encodeXY(int x, int y) { 514 SkASSERT(x >= 1 && y >= 1 && x * y <= 32); 515 if (y < x) 516 return 0x40 | encodeXY(y, x); 517 else 518 return (0x40 >> x) | (y - x); 519 } 520 521 }; 522 523 GrGLEffect::EffectKey GrGLMatrixConvolutionEffect::GenKey(const GrDrawEffect& drawEffect, 524 const GrGLCaps&) { 525 const GrMatrixConvolutionEffect& m = drawEffect.castEffect<GrMatrixConvolutionEffect>(); 526 EffectKey key = encodeXY(m.kernelSize().width(), m.kernelSize().height()); 527 key |= m.tileMode() << 7; 528 key |= m.convolveAlpha() ? 1 << 9 : 0; 529 return key; 530 } 531 532 void GrGLMatrixConvolutionEffect::setData(const GrGLUniformManager& uman, 533 const GrDrawEffect& drawEffect) { 534 const GrMatrixConvolutionEffect& conv = drawEffect.castEffect<GrMatrixConvolutionEffect>(); 535 GrTexture& texture = *conv.texture(0); 536 // the code we generated was for a specific kernel size 537 SkASSERT(conv.kernelSize() == fKernelSize); 538 SkASSERT(conv.tileMode() == fTileMode); 539 float imageIncrement[2]; 540 float ySign = texture.origin() == kTopLeft_GrSurfaceOrigin ? 1.0f : -1.0f; 541 imageIncrement[0] = 1.0f / texture.width(); 542 imageIncrement[1] = ySign / texture.height(); 543 uman.set2fv(fImageIncrementUni, 1, imageIncrement); 544 uman.set2fv(fTargetUni, 1, conv.target()); 545 uman.set1fv(fKernelUni, fKernelSize.width() * fKernelSize.height(), conv.kernel()); 546 uman.set1f(fGainUni, conv.gain()); 547 uman.set1f(fBiasUni, conv.bias()); 548 const SkIRect& bounds = conv.bounds(); 549 float left = (float) bounds.left() / texture.width(); 550 float top = (float) bounds.top() / texture.height(); 551 float right = (float) bounds.right() / texture.width(); 552 float bottom = (float) bounds.bottom() / texture.height(); 553 if (texture.origin() == kBottomLeft_GrSurfaceOrigin) { 554 uman.set4f(fBoundsUni, left, 1.0f - bottom, right, 1.0f - top); 555 } else { 556 uman.set4f(fBoundsUni, left, top, right, bottom); 557 } 558 } 559 560 GrMatrixConvolutionEffect::GrMatrixConvolutionEffect(GrTexture* texture, 561 const SkIRect& bounds, 562 const SkISize& kernelSize, 563 const SkScalar* kernel, 564 SkScalar gain, 565 SkScalar bias, 566 const SkIPoint& target, 567 TileMode tileMode, 568 bool convolveAlpha) 569 : INHERITED(texture, MakeDivByTextureWHMatrix(texture)), 570 fBounds(bounds), 571 fKernelSize(kernelSize), 572 fGain(SkScalarToFloat(gain)), 573 fBias(SkScalarToFloat(bias) / 255.0f), 574 fTileMode(tileMode), 575 fConvolveAlpha(convolveAlpha) { 576 fKernel = new float[kernelSize.width() * kernelSize.height()]; 577 for (int i = 0; i < kernelSize.width() * kernelSize.height(); i++) { 578 fKernel[i] = SkScalarToFloat(kernel[i]); 579 } 580 fTarget[0] = static_cast<float>(target.x()); 581 fTarget[1] = static_cast<float>(target.y()); 582 this->setWillNotUseInputColor(); 583 } 584 585 GrMatrixConvolutionEffect::~GrMatrixConvolutionEffect() { 586 delete[] fKernel; 587 } 588 589 const GrBackendEffectFactory& GrMatrixConvolutionEffect::getFactory() const { 590 return GrTBackendEffectFactory<GrMatrixConvolutionEffect>::getInstance(); 591 } 592 593 bool GrMatrixConvolutionEffect::onIsEqual(const GrEffect& sBase) const { 594 const GrMatrixConvolutionEffect& s = CastEffect<GrMatrixConvolutionEffect>(sBase); 595 return this->texture(0) == s.texture(0) && 596 fKernelSize == s.kernelSize() && 597 !memcmp(fKernel, s.kernel(), 598 fKernelSize.width() * fKernelSize.height() * sizeof(float)) && 599 fGain == s.gain() && 600 fBias == s.bias() && 601 fTarget == s.target() && 602 fTileMode == s.tileMode() && 603 fConvolveAlpha == s.convolveAlpha(); 604 } 605 606 GR_DEFINE_EFFECT_TEST(GrMatrixConvolutionEffect); 607 608 // A little bit less than the minimum # uniforms required by DX9SM2 (32). 609 // Allows for a 5x5 kernel (or 25x1, for that matter). 610 #define MAX_KERNEL_SIZE 25 611 612 GrEffectRef* GrMatrixConvolutionEffect::TestCreate(SkRandom* random, 613 GrContext* context, 614 const GrDrawTargetCaps&, 615 GrTexture* textures[]) { 616 int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx : 617 GrEffectUnitTest::kAlphaTextureIdx; 618 int width = random->nextRangeU(1, MAX_KERNEL_SIZE); 619 int height = random->nextRangeU(1, MAX_KERNEL_SIZE / width); 620 SkISize kernelSize = SkISize::Make(width, height); 621 SkAutoTDeleteArray<SkScalar> kernel(new SkScalar[width * height]); 622 for (int i = 0; i < width * height; i++) { 623 kernel.get()[i] = random->nextSScalar1(); 624 } 625 SkScalar gain = random->nextSScalar1(); 626 SkScalar bias = random->nextSScalar1(); 627 SkIPoint target = SkIPoint::Make(random->nextRangeU(0, kernelSize.width()), 628 random->nextRangeU(0, kernelSize.height())); 629 SkIRect bounds = SkIRect::MakeXYWH(random->nextRangeU(0, textures[texIdx]->width()), 630 random->nextRangeU(0, textures[texIdx]->height()), 631 random->nextRangeU(0, textures[texIdx]->width()), 632 random->nextRangeU(0, textures[texIdx]->height())); 633 TileMode tileMode = static_cast<TileMode>(random->nextRangeU(0, 2)); 634 bool convolveAlpha = random->nextBool(); 635 return GrMatrixConvolutionEffect::Create(textures[texIdx], 636 bounds, 637 kernelSize, 638 kernel.get(), 639 gain, 640 bias, 641 target, 642 tileMode, 643 convolveAlpha); 644 } 645 646 bool SkMatrixConvolutionImageFilter::asNewEffect(GrEffectRef** effect, 647 GrTexture* texture, 648 const SkMatrix&, 649 const SkIRect& bounds 650 ) const { 651 if (!effect) { 652 return fKernelSize.width() * fKernelSize.height() <= MAX_KERNEL_SIZE; 653 } 654 SkASSERT(fKernelSize.width() * fKernelSize.height() <= MAX_KERNEL_SIZE); 655 *effect = GrMatrixConvolutionEffect::Create(texture, 656 bounds, 657 fKernelSize, 658 fKernel, 659 fGain, 660 fBias, 661 fTarget, 662 fTileMode, 663 fConvolveAlpha); 664 return true; 665 } 666 667 /////////////////////////////////////////////////////////////////////////////// 668 669 #endif 670
