1 /* 2 * Copyright 2013 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 "SkBicubicImageFilter.h" 9 #include "SkBitmap.h" 10 #include "SkColorPriv.h" 11 #include "SkFlattenableBuffers.h" 12 #include "SkMatrix.h" 13 #include "SkRect.h" 14 #include "SkUnPreMultiply.h" 15 16 #if SK_SUPPORT_GPU 17 #include "gl/GrGLEffectMatrix.h" 18 #include "effects/GrSingleTextureEffect.h" 19 #include "GrTBackendEffectFactory.h" 20 #include "GrContext.h" 21 #include "GrTexture.h" 22 #include "SkImageFilterUtils.h" 23 #endif 24 25 SkBicubicImageFilter::SkBicubicImageFilter(const SkSize& scale, const SkScalar coefficients[16], SkImageFilter* input) 26 : INHERITED(input), 27 fScale(scale) { 28 memcpy(fCoefficients, coefficients, sizeof(fCoefficients)); 29 } 30 31 #define DS(x) SkDoubleToScalar(x) 32 33 SkBicubicImageFilter* SkBicubicImageFilter::CreateMitchell(const SkSize& scale, 34 SkImageFilter* input) { 35 static const SkScalar coefficients[16] = { 36 DS( 1.0 / 18.0), DS(-9.0 / 18.0), DS( 15.0 / 18.0), DS( -7.0 / 18.0), 37 DS(16.0 / 18.0), DS( 0.0 / 18.0), DS(-36.0 / 18.0), DS( 21.0 / 18.0), 38 DS( 1.0 / 18.0), DS( 9.0 / 18.0), DS( 27.0 / 18.0), DS(-21.0 / 18.0), 39 DS( 0.0 / 18.0), DS( 0.0 / 18.0), DS( -6.0 / 18.0), DS( 7.0 / 18.0), 40 }; 41 return SkNEW_ARGS(SkBicubicImageFilter, (scale, coefficients, input)); 42 } 43 44 SkBicubicImageFilter::SkBicubicImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) { 45 SkDEBUGCODE(uint32_t readSize =) buffer.readScalarArray(fCoefficients); 46 SkASSERT(readSize == 16); 47 fScale.fWidth = buffer.readScalar(); 48 fScale.fHeight = buffer.readScalar(); 49 } 50 51 void SkBicubicImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { 52 this->INHERITED::flatten(buffer); 53 buffer.writeScalarArray(fCoefficients, 16); 54 buffer.writeScalar(fScale.fWidth); 55 buffer.writeScalar(fScale.fHeight); 56 } 57 58 SkBicubicImageFilter::~SkBicubicImageFilter() { 59 } 60 61 inline SkPMColor cubicBlend(const SkScalar c[16], SkScalar t, SkPMColor c0, SkPMColor c1, SkPMColor c2, SkPMColor c3) { 62 SkScalar t2 = t * t, t3 = t2 * t; 63 SkScalar cc[4]; 64 // FIXME: For the fractx case, this should be refactored out of this function. 65 cc[0] = c[0] + SkScalarMul(c[1], t) + SkScalarMul(c[2], t2) + SkScalarMul(c[3], t3); 66 cc[1] = c[4] + SkScalarMul(c[5], t) + SkScalarMul(c[6], t2) + SkScalarMul(c[7], t3); 67 cc[2] = c[8] + SkScalarMul(c[9], t) + SkScalarMul(c[10], t2) + SkScalarMul(c[11], t3); 68 cc[3] = c[12] + SkScalarMul(c[13], t) + SkScalarMul(c[14], t2) + SkScalarMul(c[15], t3); 69 SkScalar a = SkScalarClampMax(SkScalarMul(cc[0], SkGetPackedA32(c0)) + SkScalarMul(cc[1], SkGetPackedA32(c1)) + SkScalarMul(cc[2], SkGetPackedA32(c2)) + SkScalarMul(cc[3], SkGetPackedA32(c3)), 255); 70 SkScalar r = SkScalarMul(cc[0], SkGetPackedR32(c0)) + SkScalarMul(cc[1], SkGetPackedR32(c1)) + SkScalarMul(cc[2], SkGetPackedR32(c2)) + SkScalarMul(cc[3], SkGetPackedR32(c3)); 71 SkScalar g = SkScalarMul(cc[0], SkGetPackedG32(c0)) + SkScalarMul(cc[1], SkGetPackedG32(c1)) + SkScalarMul(cc[2], SkGetPackedG32(c2)) + SkScalarMul(cc[3], SkGetPackedG32(c3)); 72 SkScalar b = SkScalarMul(cc[0], SkGetPackedB32(c0)) + SkScalarMul(cc[1], SkGetPackedB32(c1)) + SkScalarMul(cc[2], SkGetPackedB32(c2)) + SkScalarMul(cc[3], SkGetPackedB32(c3)); 73 return SkPackARGB32(SkScalarRoundToInt(a), 74 SkScalarRoundToInt(SkScalarClampMax(r, a)), 75 SkScalarRoundToInt(SkScalarClampMax(g, a)), 76 SkScalarRoundToInt(SkScalarClampMax(b, a))); 77 } 78 79 bool SkBicubicImageFilter::onFilterImage(Proxy* proxy, 80 const SkBitmap& source, 81 const SkMatrix& matrix, 82 SkBitmap* result, 83 SkIPoint* loc) { 84 SkBitmap src = source; 85 if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, loc)) { 86 return false; 87 } 88 89 if (src.config() != SkBitmap::kARGB_8888_Config) { 90 return false; 91 } 92 93 SkAutoLockPixels alp(src); 94 if (!src.getPixels()) { 95 return false; 96 } 97 98 SkRect dstRect = SkRect::MakeWH(SkScalarMul(SkIntToScalar(src.width()), fScale.fWidth), 99 SkScalarMul(SkIntToScalar(src.height()), fScale.fHeight)); 100 SkIRect dstIRect; 101 dstRect.roundOut(&dstIRect); 102 result->setConfig(src.config(), dstIRect.width(), dstIRect.height()); 103 result->allocPixels(); 104 if (!result->getPixels()) { 105 return false; 106 } 107 108 SkRect srcRect; 109 src.getBounds(&srcRect); 110 SkMatrix inverse; 111 inverse.setRectToRect(dstRect, srcRect, SkMatrix::kFill_ScaleToFit); 112 inverse.postTranslate(SkFloatToScalar(-0.5f), SkFloatToScalar(-0.5f)); 113 114 for (int y = dstIRect.fTop; y < dstIRect.fBottom; ++y) { 115 SkPMColor* dptr = result->getAddr32(dstIRect.fLeft, y); 116 for (int x = dstIRect.fLeft; x < dstIRect.fRight; ++x) { 117 SkPoint srcPt, dstPt = SkPoint::Make(SkIntToScalar(x), SkIntToScalar(y)); 118 inverse.mapPoints(&srcPt, &dstPt, 1); 119 SkScalar fractx = srcPt.fX - SkScalarFloorToScalar(srcPt.fX); 120 SkScalar fracty = srcPt.fY - SkScalarFloorToScalar(srcPt.fY); 121 int sx = SkScalarFloorToInt(srcPt.fX); 122 int sy = SkScalarFloorToInt(srcPt.fY); 123 int x0 = SkClampMax(sx - 1, src.width() - 1); 124 int x1 = SkClampMax(sx , src.width() - 1); 125 int x2 = SkClampMax(sx + 1, src.width() - 1); 126 int x3 = SkClampMax(sx + 2, src.width() - 1); 127 int y0 = SkClampMax(sy - 1, src.height() - 1); 128 int y1 = SkClampMax(sy , src.height() - 1); 129 int y2 = SkClampMax(sy + 1, src.height() - 1); 130 int y3 = SkClampMax(sy + 2, src.height() - 1); 131 SkPMColor s00 = *src.getAddr32(x0, y0); 132 SkPMColor s10 = *src.getAddr32(x1, y0); 133 SkPMColor s20 = *src.getAddr32(x2, y0); 134 SkPMColor s30 = *src.getAddr32(x3, y0); 135 SkPMColor s0 = cubicBlend(fCoefficients, fractx, s00, s10, s20, s30); 136 SkPMColor s01 = *src.getAddr32(x0, y1); 137 SkPMColor s11 = *src.getAddr32(x1, y1); 138 SkPMColor s21 = *src.getAddr32(x2, y1); 139 SkPMColor s31 = *src.getAddr32(x3, y1); 140 SkPMColor s1 = cubicBlend(fCoefficients, fractx, s01, s11, s21, s31); 141 SkPMColor s02 = *src.getAddr32(x0, y2); 142 SkPMColor s12 = *src.getAddr32(x1, y2); 143 SkPMColor s22 = *src.getAddr32(x2, y2); 144 SkPMColor s32 = *src.getAddr32(x3, y2); 145 SkPMColor s2 = cubicBlend(fCoefficients, fractx, s02, s12, s22, s32); 146 SkPMColor s03 = *src.getAddr32(x0, y3); 147 SkPMColor s13 = *src.getAddr32(x1, y3); 148 SkPMColor s23 = *src.getAddr32(x2, y3); 149 SkPMColor s33 = *src.getAddr32(x3, y3); 150 SkPMColor s3 = cubicBlend(fCoefficients, fractx, s03, s13, s23, s33); 151 *dptr++ = cubicBlend(fCoefficients, fracty, s0, s1, s2, s3); 152 } 153 } 154 return true; 155 } 156 157 /////////////////////////////////////////////////////////////////////////////// 158 159 #if SK_SUPPORT_GPU 160 class GrGLBicubicEffect; 161 162 class GrBicubicEffect : public GrSingleTextureEffect { 163 public: 164 virtual ~GrBicubicEffect(); 165 166 static const char* Name() { return "Bicubic"; } 167 const float* coefficients() const { return fCoefficients; } 168 169 typedef GrGLBicubicEffect GLEffect; 170 171 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; 172 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; 173 174 static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16]) { 175 AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients))); 176 return CreateEffectRef(effect); 177 } 178 179 private: 180 GrBicubicEffect(GrTexture*, const SkScalar coefficients[16]); 181 virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE; 182 float fCoefficients[16]; 183 184 GR_DECLARE_EFFECT_TEST; 185 186 typedef GrSingleTextureEffect INHERITED; 187 }; 188 189 class GrGLBicubicEffect : public GrGLEffect { 190 public: 191 GrGLBicubicEffect(const GrBackendEffectFactory& factory, 192 const GrDrawEffect&); 193 virtual void emitCode(GrGLShaderBuilder*, 194 const GrDrawEffect&, 195 EffectKey, 196 const char* outputColor, 197 const char* inputColor, 198 const TextureSamplerArray&) SK_OVERRIDE; 199 200 static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&); 201 202 virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; 203 204 private: 205 typedef GrGLUniformManager::UniformHandle UniformHandle; 206 207 UniformHandle fCoefficientsUni; 208 UniformHandle fImageIncrementUni; 209 210 GrGLEffectMatrix fEffectMatrix; 211 212 typedef GrGLEffect INHERITED; 213 }; 214 215 GrGLBicubicEffect::GrGLBicubicEffect(const GrBackendEffectFactory& factory, 216 const GrDrawEffect& drawEffect) 217 : INHERITED(factory) 218 , fCoefficientsUni(GrGLUniformManager::kInvalidUniformHandle) 219 , fImageIncrementUni(GrGLUniformManager::kInvalidUniformHandle) 220 , fEffectMatrix(drawEffect.castEffect<GrBicubicEffect>().coordsType()) { 221 } 222 223 void GrGLBicubicEffect::emitCode(GrGLShaderBuilder* builder, 224 const GrDrawEffect&, 225 EffectKey key, 226 const char* outputColor, 227 const char* inputColor, 228 const TextureSamplerArray& samplers) { 229 const char* coords; 230 fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, &coords); 231 fCoefficientsUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, 232 kMat44f_GrSLType, "Coefficients"); 233 fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, 234 kVec2f_GrSLType, "ImageIncrement"); 235 236 const char* imgInc = builder->getUniformCStr(fImageIncrementUni); 237 const char* coeff = builder->getUniformCStr(fCoefficientsUni); 238 239 SkString cubicBlendName; 240 241 static const GrGLShaderVar gCubicBlendArgs[] = { 242 GrGLShaderVar("coefficients", kMat44f_GrSLType), 243 GrGLShaderVar("t", kFloat_GrSLType), 244 GrGLShaderVar("c0", kVec4f_GrSLType), 245 GrGLShaderVar("c1", kVec4f_GrSLType), 246 GrGLShaderVar("c2", kVec4f_GrSLType), 247 GrGLShaderVar("c3", kVec4f_GrSLType), 248 }; 249 builder->emitFunction(GrGLShaderBuilder::kFragment_ShaderType, 250 kVec4f_GrSLType, 251 "cubicBlend", 252 SK_ARRAY_COUNT(gCubicBlendArgs), 253 gCubicBlendArgs, 254 "\tvec4 ts = vec4(1.0, t, t * t, t * t * t);\n" 255 "\tvec4 c = coefficients * ts;\n" 256 "\treturn c.x * c0 + c.y * c1 + c.z * c2 + c.w * c3;\n", 257 &cubicBlendName); 258 builder->fsCodeAppendf("\tvec2 coord = %s - %s * vec2(0.5, 0.5);\n", coords, imgInc); 259 builder->fsCodeAppendf("\tvec2 f = fract(coord / %s);\n", imgInc); 260 for (int y = 0; y < 4; ++y) { 261 for (int x = 0; x < 4; ++x) { 262 SkString coord; 263 coord.printf("coord + %s * vec2(%d, %d)", imgInc, x - 1, y - 1); 264 builder->fsCodeAppendf("\tvec4 s%d%d = ", x, y); 265 builder->appendTextureLookup(GrGLShaderBuilder::kFragment_ShaderType, 266 samplers[0], 267 coord.c_str()); 268 builder->fsCodeAppend(";\n"); 269 } 270 builder->fsCodeAppendf("\tvec4 s%d = %s(%s, f.x, s0%d, s1%d, s2%d, s3%d);\n", y, cubicBlendName.c_str(), coeff, y, y, y, y); 271 } 272 builder->fsCodeAppendf("\t%s = %s(%s, f.y, s0, s1, s2, s3);\n", outputColor, cubicBlendName.c_str(), coeff); 273 } 274 275 GrGLEffect::EffectKey GrGLBicubicEffect::GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) { 276 const GrBicubicEffect& bicubic = drawEffect.castEffect<GrBicubicEffect>(); 277 EffectKey matrixKey = GrGLEffectMatrix::GenKey(bicubic.getMatrix(), 278 drawEffect, 279 bicubic.coordsType(), 280 bicubic.texture(0)); 281 return matrixKey; 282 } 283 284 void GrGLBicubicEffect::setData(const GrGLUniformManager& uman, 285 const GrDrawEffect& drawEffect) { 286 const GrBicubicEffect& effect = drawEffect.castEffect<GrBicubicEffect>(); 287 GrTexture& texture = *effect.texture(0); 288 float imageIncrement[2]; 289 imageIncrement[0] = 1.0f / texture.width(); 290 imageIncrement[1] = 1.0f / texture.height(); 291 uman.set2fv(fImageIncrementUni, 0, 1, imageIncrement); 292 uman.setMatrix4f(fCoefficientsUni, effect.coefficients()); 293 fEffectMatrix.setData(uman, 294 effect.getMatrix(), 295 drawEffect, 296 effect.texture(0)); 297 } 298 299 GrBicubicEffect::GrBicubicEffect(GrTexture* texture, 300 const SkScalar coefficients[16]) 301 : INHERITED(texture, MakeDivByTextureWHMatrix(texture)) { 302 for (int y = 0; y < 4; y++) { 303 for (int x = 0; x < 4; x++) { 304 // Convert from row-major scalars to column-major floats. 305 fCoefficients[x * 4 + y] = SkScalarToFloat(coefficients[y * 4 + x]); 306 } 307 } 308 } 309 310 GrBicubicEffect::~GrBicubicEffect() { 311 } 312 313 const GrBackendEffectFactory& GrBicubicEffect::getFactory() const { 314 return GrTBackendEffectFactory<GrBicubicEffect>::getInstance(); 315 } 316 317 bool GrBicubicEffect::onIsEqual(const GrEffect& sBase) const { 318 const GrBicubicEffect& s = CastEffect<GrBicubicEffect>(sBase); 319 return this->texture(0) == s.texture(0) && 320 !memcmp(fCoefficients, s.coefficients(), 16); 321 } 322 323 void GrBicubicEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const { 324 // FIXME: Perhaps we can do better. 325 *validFlags = 0; 326 return; 327 } 328 329 GR_DEFINE_EFFECT_TEST(GrBicubicEffect); 330 331 GrEffectRef* GrBicubicEffect::TestCreate(SkMWCRandom* random, 332 GrContext* context, 333 const GrDrawTargetCaps&, 334 GrTexture* textures[]) { 335 int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx : 336 GrEffectUnitTest::kAlphaTextureIdx; 337 SkScalar coefficients[16]; 338 for (int i = 0; i < 16; i++) { 339 coefficients[i] = random->nextSScalar1(); 340 } 341 return GrBicubicEffect::Create(textures[texIdx], coefficients); 342 } 343 344 bool SkBicubicImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm, 345 SkBitmap* result, SkIPoint* offset) { 346 SkBitmap srcBM; 347 if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, ctm, &srcBM, offset)) { 348 return false; 349 } 350 GrTexture* srcTexture = srcBM.getTexture(); 351 GrContext* context = srcTexture->getContext(); 352 353 SkRect dstRect = SkRect::MakeWH(srcBM.width() * fScale.fWidth, 354 srcBM.height() * fScale.fHeight); 355 356 GrTextureDesc desc; 357 desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit; 358 desc.fWidth = SkScalarCeilToInt(dstRect.width()); 359 desc.fHeight = SkScalarCeilToInt(dstRect.height()); 360 desc.fConfig = kSkia8888_GrPixelConfig; 361 362 GrAutoScratchTexture ast(context, desc); 363 SkAutoTUnref<GrTexture> dst(ast.detach()); 364 if (!dst) { 365 return false; 366 } 367 GrContext::AutoRenderTarget art(context, dst->asRenderTarget()); 368 GrPaint paint; 369 paint.addColorEffect(GrBicubicEffect::Create(srcTexture, fCoefficients))->unref(); 370 SkRect srcRect; 371 srcBM.getBounds(&srcRect); 372 context->drawRectToRect(paint, dstRect, srcRect); 373 return SkImageFilterUtils::WrapTexture(dst, desc.fWidth, desc.fHeight, result); 374 } 375 #endif 376 377 /////////////////////////////////////////////////////////////////////////////// 378
