SkBicubicImageFilter.cpp revision c2594f41066102d7a8a73effd3c574142a018b9a
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 = SkScalarMul(cc[0], SkGetPackedA32(c0)) + SkScalarMul(cc[1], SkGetPackedA32(c1)) + SkScalarMul(cc[2], SkGetPackedA32(c2)) + SkScalarMul(cc[3], SkGetPackedA32(c3)); 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(SkScalarClampMax(a, 255)), SkScalarRoundToInt(SkScalarClampMax(r, 255)), SkScalarRoundToInt(SkScalarClampMax(g, 255)), SkScalarRoundToInt(SkScalarClampMax(b, 255))); 74} 75 76bool SkBicubicImageFilter::onFilterImage(Proxy* proxy, 77 const SkBitmap& source, 78 const SkMatrix& matrix, 79 SkBitmap* result, 80 SkIPoint* loc) { 81 SkBitmap src = this->getInputResult(proxy, source, matrix, loc); 82 if (src.config() != SkBitmap::kARGB_8888_Config) { 83 return false; 84 } 85 86 SkAutoLockPixels alp(src); 87 if (!src.getPixels()) { 88 return false; 89 } 90 91 SkRect dstRect = SkRect::MakeWH(SkScalarMul(SkIntToScalar(src.width()), fScale.fWidth), 92 SkScalarMul(SkIntToScalar(src.height()), fScale.fHeight)); 93 SkIRect dstIRect; 94 dstRect.roundOut(&dstIRect); 95 result->setConfig(src.config(), dstIRect.width(), dstIRect.height()); 96 result->allocPixels(); 97 if (!result->getPixels()) { 98 return false; 99 } 100 101 SkRect srcRect; 102 src.getBounds(&srcRect); 103 SkMatrix inverse; 104 inverse.setRectToRect(dstRect, srcRect, SkMatrix::kFill_ScaleToFit); 105 inverse.postTranslate(SkFloatToScalar(-0.5f), SkFloatToScalar(-0.5f)); 106 107 for (int y = dstIRect.fTop; y < dstIRect.fBottom; ++y) { 108 SkPMColor* dptr = result->getAddr32(dstIRect.fLeft, y); 109 for (int x = dstIRect.fLeft; x < dstIRect.fRight; ++x) { 110 SkPoint srcPt, dstPt = SkPoint::Make(SkIntToScalar(x), SkIntToScalar(y)); 111 inverse.mapPoints(&srcPt, &dstPt, 1); 112 SkScalar fractx = srcPt.fX - SkScalarFloorToScalar(srcPt.fX); 113 SkScalar fracty = srcPt.fY - SkScalarFloorToScalar(srcPt.fY); 114 int sx = SkScalarFloorToInt(srcPt.fX); 115 int sy = SkScalarFloorToInt(srcPt.fY); 116 int x0 = SkClampMax(sx - 1, src.width() - 1); 117 int x1 = SkClampMax(sx , src.width() - 1); 118 int x2 = SkClampMax(sx + 1, src.width() - 1); 119 int x3 = SkClampMax(sx + 2, src.width() - 1); 120 int y0 = SkClampMax(sy - 1, src.height() - 1); 121 int y1 = SkClampMax(sy , src.height() - 1); 122 int y2 = SkClampMax(sy + 1, src.height() - 1); 123 int y3 = SkClampMax(sy + 2, src.height() - 1); 124 SkPMColor s00 = *src.getAddr32(x0, y0); 125 SkPMColor s10 = *src.getAddr32(x1, y0); 126 SkPMColor s20 = *src.getAddr32(x2, y0); 127 SkPMColor s30 = *src.getAddr32(x3, y0); 128 SkPMColor s0 = cubicBlend(fCoefficients, fractx, s00, s10, s20, s30); 129 SkPMColor s01 = *src.getAddr32(x0, y1); 130 SkPMColor s11 = *src.getAddr32(x1, y1); 131 SkPMColor s21 = *src.getAddr32(x2, y1); 132 SkPMColor s31 = *src.getAddr32(x3, y1); 133 SkPMColor s1 = cubicBlend(fCoefficients, fractx, s01, s11, s21, s31); 134 SkPMColor s02 = *src.getAddr32(x0, y2); 135 SkPMColor s12 = *src.getAddr32(x1, y2); 136 SkPMColor s22 = *src.getAddr32(x2, y2); 137 SkPMColor s32 = *src.getAddr32(x3, y2); 138 SkPMColor s2 = cubicBlend(fCoefficients, fractx, s02, s12, s22, s32); 139 SkPMColor s03 = *src.getAddr32(x0, y3); 140 SkPMColor s13 = *src.getAddr32(x1, y3); 141 SkPMColor s23 = *src.getAddr32(x2, y3); 142 SkPMColor s33 = *src.getAddr32(x3, y3); 143 SkPMColor s3 = cubicBlend(fCoefficients, fractx, s03, s13, s23, s33); 144 *dptr++ = cubicBlend(fCoefficients, fracty, s0, s1, s2, s3); 145 } 146 } 147 return true; 148} 149 150/////////////////////////////////////////////////////////////////////////////// 151 152#if SK_SUPPORT_GPU 153class GrGLBicubicEffect; 154 155class GrBicubicEffect : public GrSingleTextureEffect { 156public: 157 virtual ~GrBicubicEffect(); 158 159 static const char* Name() { return "Bicubic"; } 160 const float* coefficients() const { return fCoefficients; } 161 162 typedef GrGLBicubicEffect GLEffect; 163 164 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; 165 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; 166 167 static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16]) { 168 AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients))); 169 return CreateEffectRef(effect); 170 } 171 172private: 173 GrBicubicEffect(GrTexture*, const SkScalar coefficients[16]); 174 virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE; 175 float fCoefficients[16]; 176 177 GR_DECLARE_EFFECT_TEST; 178 179 typedef GrSingleTextureEffect INHERITED; 180}; 181 182class GrGLBicubicEffect : public GrGLEffect { 183public: 184 GrGLBicubicEffect(const GrBackendEffectFactory& factory, 185 const GrEffectRef& effect); 186 virtual void emitCode(GrGLShaderBuilder*, 187 const GrEffectStage&, 188 EffectKey, 189 const char* vertexCoords, 190 const char* outputColor, 191 const char* inputColor, 192 const TextureSamplerArray&) SK_OVERRIDE; 193 194 static inline EffectKey GenKey(const GrEffectStage&, const GrGLCaps&); 195 196 virtual void setData(const GrGLUniformManager&, const GrEffectStage&) SK_OVERRIDE; 197 198private: 199 typedef GrGLUniformManager::UniformHandle UniformHandle; 200 201 UniformHandle fCoefficientsUni; 202 UniformHandle fImageIncrementUni; 203 204 GrGLEffectMatrix fEffectMatrix; 205 206 typedef GrGLEffect INHERITED; 207}; 208 209GrGLBicubicEffect::GrGLBicubicEffect(const GrBackendEffectFactory& factory, 210 const GrEffectRef& effect) 211 : INHERITED(factory) 212 , fCoefficientsUni(GrGLUniformManager::kInvalidUniformHandle) 213 , fImageIncrementUni(GrGLUniformManager::kInvalidUniformHandle) { 214} 215 216void GrGLBicubicEffect::emitCode(GrGLShaderBuilder* builder, 217 const GrEffectStage&, 218 EffectKey key, 219 const char* vertexCoords, 220 const char* outputColor, 221 const char* inputColor, 222 const TextureSamplerArray& samplers) { 223 const char* coords; 224 fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, vertexCoords, &coords); 225 fCoefficientsUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, 226 kMat44f_GrSLType, "Coefficients"); 227 fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, 228 kVec2f_GrSLType, "ImageIncrement"); 229 SkString* code = &builder->fFSCode; 230 231 const char* imgInc = builder->getUniformCStr(fImageIncrementUni); 232 const char* coeff = builder->getUniformCStr(fCoefficientsUni); 233 234 SkString cubicBlendName; 235 236 static const GrGLShaderVar gCubicBlendArgs[] = { 237 GrGLShaderVar("coefficients", kMat44f_GrSLType), 238 GrGLShaderVar("t", kFloat_GrSLType), 239 GrGLShaderVar("c0", kVec4f_GrSLType), 240 GrGLShaderVar("c1", kVec4f_GrSLType), 241 GrGLShaderVar("c2", kVec4f_GrSLType), 242 GrGLShaderVar("c3", kVec4f_GrSLType), 243 }; 244 builder->emitFunction(GrGLShaderBuilder::kFragment_ShaderType, 245 kVec4f_GrSLType, 246 "cubicBlend", 247 SK_ARRAY_COUNT(gCubicBlendArgs), 248 gCubicBlendArgs, 249 "\tvec4 ts = vec4(1.0, t, t * t, t * t * t);\n" 250 "\tvec4 c = coefficients * ts;\n" 251 "\treturn c.x * c0 + c.y * c1 + c.z * c2 + c.w * c3;\n", 252 &cubicBlendName); 253 code->appendf("\tvec2 coord = %s - %s * vec2(0.5, 0.5);\n", coords, imgInc); 254 code->appendf("\tvec2 f = fract(coord / %s);\n", imgInc); 255 for (int y = 0; y < 4; ++y) { 256 for (int x = 0; x < 4; ++x) { 257 SkString coord; 258 coord.printf("coord + %s * vec2(%d, %d)", imgInc, x - 1, y - 1); 259 code->appendf("\tvec4 s%d%d = ", x, y); 260 builder->appendTextureLookup(&builder->fFSCode, samplers[0], coord.c_str()); 261 code->appendf(";\n"); 262 } 263 code->appendf("\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); 264 } 265 code->appendf("\t%s = %s(%s, f.y, s0, s1, s2, s3);\n", outputColor, cubicBlendName.c_str(), coeff); 266} 267 268GrGLEffect::EffectKey GrGLBicubicEffect::GenKey(const GrEffectStage& s, const GrGLCaps&) { 269 const GrBicubicEffect& m = GetEffectFromStage<GrBicubicEffect>(s); 270 EffectKey matrixKey = GrGLEffectMatrix::GenKey(m.getMatrix(), 271 s.getCoordChangeMatrix(), 272 m.texture(0)); 273 return matrixKey; 274} 275 276void GrGLBicubicEffect::setData(const GrGLUniformManager& uman, 277 const GrEffectStage& stage) { 278 const GrBicubicEffect& effect = GetEffectFromStage<GrBicubicEffect>(stage); 279 GrTexture& texture = *effect.texture(0); 280 float imageIncrement[2]; 281 imageIncrement[0] = 1.0f / texture.width(); 282 imageIncrement[1] = 1.0f / texture.height(); 283 uman.set2fv(fImageIncrementUni, 0, 1, imageIncrement); 284 uman.setMatrix4f(fCoefficientsUni, effect.coefficients()); 285 fEffectMatrix.setData(uman, 286 effect.getMatrix(), 287 stage.getCoordChangeMatrix(), 288 effect.texture(0)); 289} 290 291GrBicubicEffect::GrBicubicEffect(GrTexture* texture, 292 const SkScalar coefficients[16]) 293 : INHERITED(texture, MakeDivByTextureWHMatrix(texture)) { 294 for (int y = 0; y < 4; y++) { 295 for (int x = 0; x < 4; x++) { 296 // Convert from row-major scalars to column-major floats. 297 fCoefficients[x * 4 + y] = SkScalarToFloat(coefficients[y * 4 + x]); 298 } 299 } 300} 301 302GrBicubicEffect::~GrBicubicEffect() { 303} 304 305const GrBackendEffectFactory& GrBicubicEffect::getFactory() const { 306 return GrTBackendEffectFactory<GrBicubicEffect>::getInstance(); 307} 308 309bool GrBicubicEffect::onIsEqual(const GrEffect& sBase) const { 310 const GrBicubicEffect& s = CastEffect<GrBicubicEffect>(sBase); 311 return this->texture(0) == s.texture(0) && 312 !memcmp(fCoefficients, s.coefficients(), 16); 313} 314 315void GrBicubicEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const { 316 // FIXME: Perhaps we can do better. 317 *validFlags = 0; 318 return; 319} 320 321GR_DEFINE_EFFECT_TEST(GrBicubicEffect); 322 323GrEffectRef* GrBicubicEffect::TestCreate(SkRandom* random, 324 GrContext* context, 325 GrTexture* textures[]) { 326 int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx : 327 GrEffectUnitTest::kAlphaTextureIdx; 328 SkScalar coefficients[16]; 329 for (int i = 0; i < 16; i++) { 330 coefficients[i] = random->nextSScalar1(); 331 } 332 return GrBicubicEffect::Create(textures[texIdx], coefficients); 333} 334 335bool SkBicubicImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result) { 336 SkBitmap srcBM; 337 if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, &srcBM)) { 338 return false; 339 } 340 GrTexture* srcTexture = (GrTexture*) srcBM.getTexture(); 341 GrContext* context = srcTexture->getContext(); 342 343 SkRect dstRect = SkRect::MakeWH(srcBM.width() * fScale.fWidth, 344 srcBM.height() * fScale.fHeight); 345 346 GrTextureDesc desc; 347 desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit; 348 desc.fWidth = SkScalarCeilToInt(dstRect.width()); 349 desc.fHeight = SkScalarCeilToInt(dstRect.height()); 350 desc.fConfig = kSkia8888_GrPixelConfig; 351 352 GrAutoScratchTexture ast(context, desc); 353 SkAutoTUnref<GrTexture> dst(ast.detach()); 354 if (!dst) { 355 return false; 356 } 357 GrContext::AutoRenderTarget art(context, dst->asRenderTarget()); 358 GrPaint paint; 359 paint.colorStage(0)->setEffect(GrBicubicEffect::Create(srcTexture, fCoefficients))->unref(); 360 SkRect srcRect; 361 srcBM.getBounds(&srcRect); 362 context->drawRectToRect(paint, dstRect, srcRect); 363 return SkImageFilterUtils::WrapTexture(dst, desc.fWidth, desc.fHeight, result); 364} 365#endif 366 367/////////////////////////////////////////////////////////////////////////////// 368