SkBicubicImageFilter.cpp revision c26d94fd7dc0b00cd6d0e42d28285f4a38aff021
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 25SkBicubicImageFilter::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 33SkBicubicImageFilter* 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 44SkBicubicImageFilter::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 51void 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 58SkBicubicImageFilter::~SkBicubicImageFilter() { 59} 60 61inline 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 79bool SkBicubicImageFilter::onFilterImage(Proxy* proxy, 80 const SkBitmap& source, 81 const SkMatrix& matrix, 82 SkBitmap* result, 83 SkIPoint* loc) { 84 SkBitmap src = this->getInputResult(0, proxy, source, matrix, loc); 85 if (src.config() != SkBitmap::kARGB_8888_Config) { 86 return false; 87 } 88 89 SkAutoLockPixels alp(src); 90 if (!src.getPixels()) { 91 return false; 92 } 93 94 SkRect dstRect = SkRect::MakeWH(SkScalarMul(SkIntToScalar(src.width()), fScale.fWidth), 95 SkScalarMul(SkIntToScalar(src.height()), fScale.fHeight)); 96 SkIRect dstIRect; 97 dstRect.roundOut(&dstIRect); 98 result->setConfig(src.config(), dstIRect.width(), dstIRect.height()); 99 result->allocPixels(); 100 if (!result->getPixels()) { 101 return false; 102 } 103 104 SkRect srcRect; 105 src.getBounds(&srcRect); 106 SkMatrix inverse; 107 inverse.setRectToRect(dstRect, srcRect, SkMatrix::kFill_ScaleToFit); 108 inverse.postTranslate(SkFloatToScalar(-0.5f), SkFloatToScalar(-0.5f)); 109 110 for (int y = dstIRect.fTop; y < dstIRect.fBottom; ++y) { 111 SkPMColor* dptr = result->getAddr32(dstIRect.fLeft, y); 112 for (int x = dstIRect.fLeft; x < dstIRect.fRight; ++x) { 113 SkPoint srcPt, dstPt = SkPoint::Make(SkIntToScalar(x), SkIntToScalar(y)); 114 inverse.mapPoints(&srcPt, &dstPt, 1); 115 SkScalar fractx = srcPt.fX - SkScalarFloorToScalar(srcPt.fX); 116 SkScalar fracty = srcPt.fY - SkScalarFloorToScalar(srcPt.fY); 117 int sx = SkScalarFloorToInt(srcPt.fX); 118 int sy = SkScalarFloorToInt(srcPt.fY); 119 int x0 = SkClampMax(sx - 1, src.width() - 1); 120 int x1 = SkClampMax(sx , src.width() - 1); 121 int x2 = SkClampMax(sx + 1, src.width() - 1); 122 int x3 = SkClampMax(sx + 2, src.width() - 1); 123 int y0 = SkClampMax(sy - 1, src.height() - 1); 124 int y1 = SkClampMax(sy , src.height() - 1); 125 int y2 = SkClampMax(sy + 1, src.height() - 1); 126 int y3 = SkClampMax(sy + 2, src.height() - 1); 127 SkPMColor s00 = *src.getAddr32(x0, y0); 128 SkPMColor s10 = *src.getAddr32(x1, y0); 129 SkPMColor s20 = *src.getAddr32(x2, y0); 130 SkPMColor s30 = *src.getAddr32(x3, y0); 131 SkPMColor s0 = cubicBlend(fCoefficients, fractx, s00, s10, s20, s30); 132 SkPMColor s01 = *src.getAddr32(x0, y1); 133 SkPMColor s11 = *src.getAddr32(x1, y1); 134 SkPMColor s21 = *src.getAddr32(x2, y1); 135 SkPMColor s31 = *src.getAddr32(x3, y1); 136 SkPMColor s1 = cubicBlend(fCoefficients, fractx, s01, s11, s21, s31); 137 SkPMColor s02 = *src.getAddr32(x0, y2); 138 SkPMColor s12 = *src.getAddr32(x1, y2); 139 SkPMColor s22 = *src.getAddr32(x2, y2); 140 SkPMColor s32 = *src.getAddr32(x3, y2); 141 SkPMColor s2 = cubicBlend(fCoefficients, fractx, s02, s12, s22, s32); 142 SkPMColor s03 = *src.getAddr32(x0, y3); 143 SkPMColor s13 = *src.getAddr32(x1, y3); 144 SkPMColor s23 = *src.getAddr32(x2, y3); 145 SkPMColor s33 = *src.getAddr32(x3, y3); 146 SkPMColor s3 = cubicBlend(fCoefficients, fractx, s03, s13, s23, s33); 147 *dptr++ = cubicBlend(fCoefficients, fracty, s0, s1, s2, s3); 148 } 149 } 150 return true; 151} 152 153/////////////////////////////////////////////////////////////////////////////// 154 155#if SK_SUPPORT_GPU 156class GrGLBicubicEffect; 157 158class GrBicubicEffect : public GrSingleTextureEffect { 159public: 160 virtual ~GrBicubicEffect(); 161 162 static const char* Name() { return "Bicubic"; } 163 const float* coefficients() const { return fCoefficients; } 164 165 typedef GrGLBicubicEffect GLEffect; 166 167 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; 168 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; 169 170 static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16]) { 171 AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients))); 172 return CreateEffectRef(effect); 173 } 174 175private: 176 GrBicubicEffect(GrTexture*, const SkScalar coefficients[16]); 177 virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE; 178 float fCoefficients[16]; 179 180 GR_DECLARE_EFFECT_TEST; 181 182 typedef GrSingleTextureEffect INHERITED; 183}; 184 185class GrGLBicubicEffect : public GrGLEffect { 186public: 187 GrGLBicubicEffect(const GrBackendEffectFactory& factory, 188 const GrDrawEffect&); 189 virtual void emitCode(GrGLShaderBuilder*, 190 const GrDrawEffect&, 191 EffectKey, 192 const char* outputColor, 193 const char* inputColor, 194 const TextureSamplerArray&) SK_OVERRIDE; 195 196 static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&); 197 198 virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; 199 200private: 201 typedef GrGLUniformManager::UniformHandle UniformHandle; 202 203 UniformHandle fCoefficientsUni; 204 UniformHandle fImageIncrementUni; 205 206 GrGLEffectMatrix fEffectMatrix; 207 208 typedef GrGLEffect INHERITED; 209}; 210 211GrGLBicubicEffect::GrGLBicubicEffect(const GrBackendEffectFactory& factory, 212 const GrDrawEffect& drawEffect) 213 : INHERITED(factory) 214 , fCoefficientsUni(GrGLUniformManager::kInvalidUniformHandle) 215 , fImageIncrementUni(GrGLUniformManager::kInvalidUniformHandle) 216 , fEffectMatrix(drawEffect.castEffect<GrBicubicEffect>().coordsType()) { 217} 218 219void GrGLBicubicEffect::emitCode(GrGLShaderBuilder* builder, 220 const GrDrawEffect&, 221 EffectKey key, 222 const char* outputColor, 223 const char* inputColor, 224 const TextureSamplerArray& samplers) { 225 const char* coords; 226 fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, &coords); 227 fCoefficientsUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, 228 kMat44f_GrSLType, "Coefficients"); 229 fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, 230 kVec2f_GrSLType, "ImageIncrement"); 231 232 const char* imgInc = builder->getUniformCStr(fImageIncrementUni); 233 const char* coeff = builder->getUniformCStr(fCoefficientsUni); 234 235 SkString cubicBlendName; 236 237 static const GrGLShaderVar gCubicBlendArgs[] = { 238 GrGLShaderVar("coefficients", kMat44f_GrSLType), 239 GrGLShaderVar("t", kFloat_GrSLType), 240 GrGLShaderVar("c0", kVec4f_GrSLType), 241 GrGLShaderVar("c1", kVec4f_GrSLType), 242 GrGLShaderVar("c2", kVec4f_GrSLType), 243 GrGLShaderVar("c3", kVec4f_GrSLType), 244 }; 245 builder->emitFunction(GrGLShaderBuilder::kFragment_ShaderType, 246 kVec4f_GrSLType, 247 "cubicBlend", 248 SK_ARRAY_COUNT(gCubicBlendArgs), 249 gCubicBlendArgs, 250 "\tvec4 ts = vec4(1.0, t, t * t, t * t * t);\n" 251 "\tvec4 c = coefficients * ts;\n" 252 "\treturn c.x * c0 + c.y * c1 + c.z * c2 + c.w * c3;\n", 253 &cubicBlendName); 254 builder->fsCodeAppendf("\tvec2 coord = %s - %s * vec2(0.5, 0.5);\n", coords, imgInc); 255 builder->fsCodeAppendf("\tvec2 f = fract(coord / %s);\n", imgInc); 256 for (int y = 0; y < 4; ++y) { 257 for (int x = 0; x < 4; ++x) { 258 SkString coord; 259 coord.printf("coord + %s * vec2(%d, %d)", imgInc, x - 1, y - 1); 260 builder->fsCodeAppendf("\tvec4 s%d%d = ", x, y); 261 builder->appendTextureLookup(GrGLShaderBuilder::kFragment_ShaderType, 262 samplers[0], 263 coord.c_str()); 264 builder->fsCodeAppend(";\n"); 265 } 266 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); 267 } 268 builder->fsCodeAppendf("\t%s = %s(%s, f.y, s0, s1, s2, s3);\n", outputColor, cubicBlendName.c_str(), coeff); 269} 270 271GrGLEffect::EffectKey GrGLBicubicEffect::GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) { 272 const GrBicubicEffect& bicubic = drawEffect.castEffect<GrBicubicEffect>(); 273 EffectKey matrixKey = GrGLEffectMatrix::GenKey(bicubic.getMatrix(), 274 drawEffect, 275 bicubic.coordsType(), 276 bicubic.texture(0)); 277 return matrixKey; 278} 279 280void GrGLBicubicEffect::setData(const GrGLUniformManager& uman, 281 const GrDrawEffect& drawEffect) { 282 const GrBicubicEffect& effect = drawEffect.castEffect<GrBicubicEffect>(); 283 GrTexture& texture = *effect.texture(0); 284 float imageIncrement[2]; 285 imageIncrement[0] = 1.0f / texture.width(); 286 imageIncrement[1] = 1.0f / texture.height(); 287 uman.set2fv(fImageIncrementUni, 0, 1, imageIncrement); 288 uman.setMatrix4f(fCoefficientsUni, effect.coefficients()); 289 fEffectMatrix.setData(uman, 290 effect.getMatrix(), 291 drawEffect, 292 effect.texture(0)); 293} 294 295GrBicubicEffect::GrBicubicEffect(GrTexture* texture, 296 const SkScalar coefficients[16]) 297 : INHERITED(texture, MakeDivByTextureWHMatrix(texture)) { 298 for (int y = 0; y < 4; y++) { 299 for (int x = 0; x < 4; x++) { 300 // Convert from row-major scalars to column-major floats. 301 fCoefficients[x * 4 + y] = SkScalarToFloat(coefficients[y * 4 + x]); 302 } 303 } 304} 305 306GrBicubicEffect::~GrBicubicEffect() { 307} 308 309const GrBackendEffectFactory& GrBicubicEffect::getFactory() const { 310 return GrTBackendEffectFactory<GrBicubicEffect>::getInstance(); 311} 312 313bool GrBicubicEffect::onIsEqual(const GrEffect& sBase) const { 314 const GrBicubicEffect& s = CastEffect<GrBicubicEffect>(sBase); 315 return this->texture(0) == s.texture(0) && 316 !memcmp(fCoefficients, s.coefficients(), 16); 317} 318 319void GrBicubicEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const { 320 // FIXME: Perhaps we can do better. 321 *validFlags = 0; 322 return; 323} 324 325GR_DEFINE_EFFECT_TEST(GrBicubicEffect); 326 327GrEffectRef* GrBicubicEffect::TestCreate(SkMWCRandom* random, 328 GrContext* context, 329 const GrDrawTargetCaps&, 330 GrTexture* textures[]) { 331 int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx : 332 GrEffectUnitTest::kAlphaTextureIdx; 333 SkScalar coefficients[16]; 334 for (int i = 0; i < 16; i++) { 335 coefficients[i] = random->nextSScalar1(); 336 } 337 return GrBicubicEffect::Create(textures[texIdx], coefficients); 338} 339 340bool SkBicubicImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result) { 341 SkBitmap srcBM; 342 if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, &srcBM)) { 343 return false; 344 } 345 GrTexture* srcTexture = (GrTexture*) srcBM.getTexture(); 346 GrContext* context = srcTexture->getContext(); 347 348 SkRect dstRect = SkRect::MakeWH(srcBM.width() * fScale.fWidth, 349 srcBM.height() * fScale.fHeight); 350 351 GrTextureDesc desc; 352 desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit; 353 desc.fWidth = SkScalarCeilToInt(dstRect.width()); 354 desc.fHeight = SkScalarCeilToInt(dstRect.height()); 355 desc.fConfig = kSkia8888_GrPixelConfig; 356 357 GrAutoScratchTexture ast(context, desc); 358 SkAutoTUnref<GrTexture> dst(ast.detach()); 359 if (!dst) { 360 return false; 361 } 362 GrContext::AutoRenderTarget art(context, dst->asRenderTarget()); 363 GrPaint paint; 364 paint.colorStage(0)->setEffect(GrBicubicEffect::Create(srcTexture, fCoefficients))->unref(); 365 SkRect srcRect; 366 srcBM.getBounds(&srcRect); 367 context->drawRectToRect(paint, dstRect, srcRect); 368 return SkImageFilterUtils::WrapTexture(dst, desc.fWidth, desc.fHeight, result); 369} 370#endif 371 372/////////////////////////////////////////////////////////////////////////////// 373