SkMatrixConvolutionImageFilter.cpp revision 0ac6af49975c54c2debf41e9200af416ecd2d973
13c827367444ee418f129b2c238299f49d3264554Jarkko Poyry/* 23c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * Copyright 2012 The Android Open Source Project 33c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * 43c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * Use of this source code is governed by a BSD-style license that can be 53c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * found in the LICENSE file. 63c827367444ee418f129b2c238299f49d3264554Jarkko Poyry */ 73c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 83c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "SkMatrixConvolutionImageFilter.h" 93c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "SkBitmap.h" 103c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "SkColorPriv.h" 113c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "SkFlattenableBuffers.h" 123c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "SkRect.h" 133c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "SkUnPreMultiply.h" 143c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 153c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#if SK_SUPPORT_GPU 163c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "gl/GrGLEffect.h" 173c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "gl/GrGLEffectMatrix.h" 183c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "effects/GrSingleTextureEffect.h" 193c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "GrTBackendEffectFactory.h" 203c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "GrTexture.h" 213c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "SkMatrix.h" 223c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 233c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#endif 243c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 253c827367444ee418f129b2c238299f49d3264554Jarkko PoyrySkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(const SkISize& kernelSize, const SkScalar* kernel, SkScalar gain, SkScalar bias, const SkIPoint& target, TileMode tileMode, bool convolveAlpha, SkImageFilter* input) 263c827367444ee418f129b2c238299f49d3264554Jarkko Poyry : INHERITED(input), 273c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fKernelSize(kernelSize), 283c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fGain(gain), 293c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fBias(bias), 303c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fTarget(target), 313c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fTileMode(tileMode), 323c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fConvolveAlpha(convolveAlpha) { 333c827367444ee418f129b2c238299f49d3264554Jarkko Poyry uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight; 343c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fKernel = SkNEW_ARRAY(SkScalar, size); 353c827367444ee418f129b2c238299f49d3264554Jarkko Poyry memcpy(fKernel, kernel, size * sizeof(SkScalar)); 363c827367444ee418f129b2c238299f49d3264554Jarkko Poyry SkASSERT(kernelSize.fWidth >= 1 && kernelSize.fHeight >= 1); 373c827367444ee418f129b2c238299f49d3264554Jarkko Poyry SkASSERT(target.fX >= 0 && target.fX < kernelSize.fWidth); 383c827367444ee418f129b2c238299f49d3264554Jarkko Poyry SkASSERT(target.fY >= 0 && target.fY < kernelSize.fHeight); 393c827367444ee418f129b2c238299f49d3264554Jarkko Poyry} 403c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 413c827367444ee418f129b2c238299f49d3264554Jarkko PoyrySkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) { 423c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fKernelSize.fWidth = buffer.readInt(); 433c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fKernelSize.fHeight = buffer.readInt(); 443c827367444ee418f129b2c238299f49d3264554Jarkko Poyry uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight; 453c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fKernel = SkNEW_ARRAY(SkScalar, size); 463c827367444ee418f129b2c238299f49d3264554Jarkko Poyry SkDEBUGCODE(uint32_t readSize = )buffer.readScalarArray(fKernel); 473c827367444ee418f129b2c238299f49d3264554Jarkko Poyry SkASSERT(readSize == size); 483c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fGain = buffer.readScalar(); 493c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fBias = buffer.readScalar(); 503c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fTarget.fX = buffer.readInt(); 513c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fTarget.fY = buffer.readInt(); 523c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fTileMode = (TileMode) buffer.readInt(); 533c827367444ee418f129b2c238299f49d3264554Jarkko Poyry fConvolveAlpha = buffer.readBool(); 543c827367444ee418f129b2c238299f49d3264554Jarkko Poyry} 553c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 563c827367444ee418f129b2c238299f49d3264554Jarkko Poyryvoid SkMatrixConvolutionImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { 573c827367444ee418f129b2c238299f49d3264554Jarkko Poyry this->INHERITED::flatten(buffer); 583c827367444ee418f129b2c238299f49d3264554Jarkko Poyry buffer.writeInt(fKernelSize.fWidth); 593c827367444ee418f129b2c238299f49d3264554Jarkko Poyry buffer.writeInt(fKernelSize.fHeight); 603c827367444ee418f129b2c238299f49d3264554Jarkko Poyry buffer.writeScalarArray(fKernel, fKernelSize.fWidth * fKernelSize.fHeight); 613c827367444ee418f129b2c238299f49d3264554Jarkko Poyry buffer.writeScalar(fGain); 623c827367444ee418f129b2c238299f49d3264554Jarkko Poyry buffer.writeScalar(fBias); 633c827367444ee418f129b2c238299f49d3264554Jarkko Poyry buffer.writeInt(fTarget.fX); 643c827367444ee418f129b2c238299f49d3264554Jarkko Poyry buffer.writeInt(fTarget.fY); 653c827367444ee418f129b2c238299f49d3264554Jarkko Poyry buffer.writeInt((int) fTileMode); 663c827367444ee418f129b2c238299f49d3264554Jarkko Poyry buffer.writeBool(fConvolveAlpha); 673c827367444ee418f129b2c238299f49d3264554Jarkko Poyry} 683c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 693c827367444ee418f129b2c238299f49d3264554Jarkko PoyrySkMatrixConvolutionImageFilter::~SkMatrixConvolutionImageFilter() { 703c827367444ee418f129b2c238299f49d3264554Jarkko Poyry delete[] fKernel; 713c827367444ee418f129b2c238299f49d3264554Jarkko Poyry} 723c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 733c827367444ee418f129b2c238299f49d3264554Jarkko Poyryclass UncheckedPixelFetcher { 743c827367444ee418f129b2c238299f49d3264554Jarkko Poyrypublic: 753c827367444ee418f129b2c238299f49d3264554Jarkko Poyry static inline SkPMColor fetch(const SkBitmap& src, int x, int y) { 763c827367444ee418f129b2c238299f49d3264554Jarkko Poyry return *src.getAddr32(x, y); 773c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 783c827367444ee418f129b2c238299f49d3264554Jarkko Poyry}; 793c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 803c827367444ee418f129b2c238299f49d3264554Jarkko Poyryclass ClampPixelFetcher { 813c827367444ee418f129b2c238299f49d3264554Jarkko Poyrypublic: 823c827367444ee418f129b2c238299f49d3264554Jarkko Poyry static inline SkPMColor fetch(const SkBitmap& src, int x, int y) { 833c827367444ee418f129b2c238299f49d3264554Jarkko Poyry x = SkClampMax(x, src.width() - 1); 843c827367444ee418f129b2c238299f49d3264554Jarkko Poyry y = SkClampMax(y, src.height() - 1); 853c827367444ee418f129b2c238299f49d3264554Jarkko Poyry return *src.getAddr32(x, y); 863c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 873c827367444ee418f129b2c238299f49d3264554Jarkko Poyry}; 883c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 893c827367444ee418f129b2c238299f49d3264554Jarkko Poyryclass RepeatPixelFetcher { 903c827367444ee418f129b2c238299f49d3264554Jarkko Poyrypublic: 913c827367444ee418f129b2c238299f49d3264554Jarkko Poyry static inline SkPMColor fetch(const SkBitmap& src, int x, int y) { 923c827367444ee418f129b2c238299f49d3264554Jarkko Poyry x %= src.width(); 933c827367444ee418f129b2c238299f49d3264554Jarkko Poyry y %= src.height(); 943c827367444ee418f129b2c238299f49d3264554Jarkko Poyry if (x < 0) { 953c827367444ee418f129b2c238299f49d3264554Jarkko Poyry x += src.width(); 963c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 973c827367444ee418f129b2c238299f49d3264554Jarkko Poyry if (y < 0) { 983c827367444ee418f129b2c238299f49d3264554Jarkko Poyry y += src.height(); 993c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 1003c827367444ee418f129b2c238299f49d3264554Jarkko Poyry return *src.getAddr32(x, y); 1013c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 1023c827367444ee418f129b2c238299f49d3264554Jarkko Poyry}; 1033c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 1043c827367444ee418f129b2c238299f49d3264554Jarkko Poyryclass ClampToBlackPixelFetcher { 1053c827367444ee418f129b2c238299f49d3264554Jarkko Poyrypublic: 1063c827367444ee418f129b2c238299f49d3264554Jarkko Poyry static inline SkPMColor fetch(const SkBitmap& src, int x, int y) { 1073c827367444ee418f129b2c238299f49d3264554Jarkko Poyry if (x < 0 || x >= src.width() || y < 0 || y >= src.height()) { 1083c827367444ee418f129b2c238299f49d3264554Jarkko Poyry return 0; 1093c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } else { 1103c827367444ee418f129b2c238299f49d3264554Jarkko Poyry return *src.getAddr32(x, y); 1113c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 1123c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 1133c827367444ee418f129b2c238299f49d3264554Jarkko Poyry}; 1143c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 1153c827367444ee418f129b2c238299f49d3264554Jarkko Poyrytemplate<class PixelFetcher, bool convolveAlpha> 1163c827367444ee418f129b2c238299f49d3264554Jarkko Poyryvoid SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) { 1173c827367444ee418f129b2c238299f49d3264554Jarkko Poyry for (int y = rect.fTop; y < rect.fBottom; ++y) { 1183c827367444ee418f129b2c238299f49d3264554Jarkko Poyry SkPMColor* dptr = result->getAddr32(rect.fLeft, y); 1193c827367444ee418f129b2c238299f49d3264554Jarkko Poyry for (int x = rect.fLeft; x < rect.fRight; ++x) { 1203c827367444ee418f129b2c238299f49d3264554Jarkko Poyry SkScalar sumA = 0, sumR = 0, sumG = 0, sumB = 0; 1213c827367444ee418f129b2c238299f49d3264554Jarkko Poyry for (int cy = 0; cy < fKernelSize.fHeight; cy++) { 1223c827367444ee418f129b2c238299f49d3264554Jarkko Poyry for (int cx = 0; cx < fKernelSize.fWidth; cx++) { 1233c827367444ee418f129b2c238299f49d3264554Jarkko Poyry SkPMColor s = PixelFetcher::fetch(src, x + cx - fTarget.fX, y + cy - fTarget.fY); 1243c827367444ee418f129b2c238299f49d3264554Jarkko Poyry SkScalar k = fKernel[cy * fKernelSize.fWidth + cx]; 1253c827367444ee418f129b2c238299f49d3264554Jarkko Poyry if (convolveAlpha) { 1263c827367444ee418f129b2c238299f49d3264554Jarkko Poyry sumA += SkScalarMul(SkIntToScalar(SkGetPackedA32(s)), k); 1273c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 1283c827367444ee418f129b2c238299f49d3264554Jarkko Poyry sumR += SkScalarMul(SkIntToScalar(SkGetPackedR32(s)), k); 1293c827367444ee418f129b2c238299f49d3264554Jarkko Poyry sumG += SkScalarMul(SkIntToScalar(SkGetPackedG32(s)), k); 1303c827367444ee418f129b2c238299f49d3264554Jarkko Poyry sumB += SkScalarMul(SkIntToScalar(SkGetPackedB32(s)), k); 1313c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 1323c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 1333c827367444ee418f129b2c238299f49d3264554Jarkko Poyry int a = convolveAlpha 1343c827367444ee418f129b2c238299f49d3264554Jarkko Poyry ? SkClampMax(SkScalarFloorToInt(SkScalarMul(sumA, fGain) + fBias), 255) 1353c827367444ee418f129b2c238299f49d3264554Jarkko Poyry : 255; 1363c827367444ee418f129b2c238299f49d3264554Jarkko Poyry int r = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumR, fGain) + fBias), a); 1373c827367444ee418f129b2c238299f49d3264554Jarkko Poyry int g = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumG, fGain) + fBias), a); 1383c827367444ee418f129b2c238299f49d3264554Jarkko Poyry int b = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumB, fGain) + fBias), a); 1393c827367444ee418f129b2c238299f49d3264554Jarkko Poyry if (!convolveAlpha) { 1403c827367444ee418f129b2c238299f49d3264554Jarkko Poyry a = SkGetPackedA32(PixelFetcher::fetch(src, x, y)); 1413c827367444ee418f129b2c238299f49d3264554Jarkko Poyry *dptr++ = SkPreMultiplyARGB(a, r, g, b); 1423c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } else { 1433c827367444ee418f129b2c238299f49d3264554Jarkko Poyry *dptr++ = SkPackARGB32(a, r, g, b); 1443c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 1453c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 1463c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 1473c827367444ee418f129b2c238299f49d3264554Jarkko Poyry} 1483c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 1493c827367444ee418f129b2c238299f49d3264554Jarkko Poyrytemplate<class PixelFetcher> 1503c827367444ee418f129b2c238299f49d3264554Jarkko Poyryvoid SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) { 1513c827367444ee418f129b2c238299f49d3264554Jarkko Poyry if (fConvolveAlpha) { 1523c827367444ee418f129b2c238299f49d3264554Jarkko Poyry filterPixels<PixelFetcher, true>(src, result, rect); 1533c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } else { 1543c827367444ee418f129b2c238299f49d3264554Jarkko Poyry filterPixels<PixelFetcher, false>(src, result, rect); 1553c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 1563c827367444ee418f129b2c238299f49d3264554Jarkko Poyry} 1573c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 1583c827367444ee418f129b2c238299f49d3264554Jarkko Poyryvoid SkMatrixConvolutionImageFilter::filterInteriorPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) { 1593c827367444ee418f129b2c238299f49d3264554Jarkko Poyry filterPixels<UncheckedPixelFetcher>(src, result, rect); 1603c827367444ee418f129b2c238299f49d3264554Jarkko Poyry} 1613c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 1623c827367444ee418f129b2c238299f49d3264554Jarkko Poyryvoid SkMatrixConvolutionImageFilter::filterBorderPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) { 1633c827367444ee418f129b2c238299f49d3264554Jarkko Poyry switch (fTileMode) { 1643c827367444ee418f129b2c238299f49d3264554Jarkko Poyry case kClamp_TileMode: 1653c827367444ee418f129b2c238299f49d3264554Jarkko Poyry filterPixels<ClampPixelFetcher>(src, result, rect); 1663c827367444ee418f129b2c238299f49d3264554Jarkko Poyry break; 1673c827367444ee418f129b2c238299f49d3264554Jarkko Poyry case kRepeat_TileMode: 1683c827367444ee418f129b2c238299f49d3264554Jarkko Poyry filterPixels<RepeatPixelFetcher>(src, result, rect); 1693c827367444ee418f129b2c238299f49d3264554Jarkko Poyry break; 1703c827367444ee418f129b2c238299f49d3264554Jarkko Poyry case kClampToBlack_TileMode: 1713c827367444ee418f129b2c238299f49d3264554Jarkko Poyry filterPixels<ClampToBlackPixelFetcher>(src, result, rect); 1723c827367444ee418f129b2c238299f49d3264554Jarkko Poyry break; 1733c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 1743c827367444ee418f129b2c238299f49d3264554Jarkko Poyry} 1753c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 1763c827367444ee418f129b2c238299f49d3264554Jarkko Poyry// FIXME: This should be refactored to SkSingleInputImageFilter for 1773c827367444ee418f129b2c238299f49d3264554Jarkko Poyry// use by other filters. For now, we assume the input is always 1783c827367444ee418f129b2c238299f49d3264554Jarkko Poyry// premultiplied and unpremultiply it 1793c827367444ee418f129b2c238299f49d3264554Jarkko Poyrystatic SkBitmap unpremultiplyBitmap(const SkBitmap& src) 180{ 181 SkAutoLockPixels alp(src); 182 if (!src.getPixels()) { 183 return SkBitmap(); 184 } 185 SkBitmap result; 186 result.setConfig(src.config(), src.width(), src.height()); 187 result.allocPixels(); 188 if (!result.getPixels()) { 189 return SkBitmap(); 190 } 191 for (int y = 0; y < src.height(); ++y) { 192 const uint32_t* srcRow = src.getAddr32(0, y); 193 uint32_t* dstRow = result.getAddr32(0, y); 194 for (int x = 0; x < src.width(); ++x) { 195 dstRow[x] = SkUnPreMultiply::PMColorToColor(srcRow[x]); 196 } 197 } 198 return result; 199} 200 201bool SkMatrixConvolutionImageFilter::onFilterImage(Proxy* proxy, 202 const SkBitmap& source, 203 const SkMatrix& matrix, 204 SkBitmap* result, 205 SkIPoint* loc) { 206 SkBitmap src = this->getInputResult(proxy, source, matrix, loc); 207 if (src.config() != SkBitmap::kARGB_8888_Config) { 208 return false; 209 } 210 211 if (!fConvolveAlpha && !src.isOpaque()) { 212 src = unpremultiplyBitmap(src); 213 } 214 215 SkAutoLockPixels alp(src); 216 if (!src.getPixels()) { 217 return false; 218 } 219 220 result->setConfig(src.config(), src.width(), src.height()); 221 result->allocPixels(); 222 223 SkIRect interior = SkIRect::MakeXYWH(fTarget.fX, fTarget.fY, 224 src.width() - fKernelSize.fWidth + 1, 225 src.height() - fKernelSize.fHeight + 1); 226 SkIRect top = SkIRect::MakeWH(src.width(), fTarget.fY); 227 SkIRect bottom = SkIRect::MakeLTRB(0, interior.bottom(), 228 src.width(), src.height()); 229 SkIRect left = SkIRect::MakeXYWH(0, interior.top(), 230 fTarget.fX, interior.height()); 231 SkIRect right = SkIRect::MakeLTRB(interior.right(), interior.top(), 232 src.width(), interior.bottom()); 233 filterBorderPixels(src, result, top); 234 filterBorderPixels(src, result, left); 235 filterInteriorPixels(src, result, interior); 236 filterBorderPixels(src, result, right); 237 filterBorderPixels(src, result, bottom); 238 return true; 239} 240 241#if SK_SUPPORT_GPU 242 243/////////////////////////////////////////////////////////////////////////////// 244 245class GrGLMatrixConvolutionEffect; 246 247class GrMatrixConvolutionEffect : public GrSingleTextureEffect { 248public: 249 typedef SkMatrixConvolutionImageFilter::TileMode TileMode; 250 static GrEffectRef* Create(GrTexture* texture, 251 const SkISize& kernelSize, 252 const SkScalar* kernel, 253 SkScalar gain, 254 SkScalar bias, 255 const SkIPoint& target, 256 TileMode tileMode, 257 bool convolveAlpha) { 258 SkAutoTUnref<GrEffect> effect(SkNEW_ARGS(GrMatrixConvolutionEffect, (texture, 259 kernelSize, 260 kernel, 261 gain, 262 bias, 263 target, 264 tileMode, 265 convolveAlpha))); 266 return CreateEffectPtr(effect); 267 } 268 virtual ~GrMatrixConvolutionEffect(); 269 270 virtual void getConstantColorComponents(GrColor* color, 271 uint32_t* validFlags) const SK_OVERRIDE { 272 // TODO: Try to do better? 273 *validFlags = 0; 274 } 275 276 static const char* Name() { return "MatrixConvolution"; } 277 const SkISize& kernelSize() const { return fKernelSize; } 278 const float* target() const { return fTarget; } 279 const float* kernel() const { return fKernel; } 280 float gain() const { return fGain; } 281 float bias() const { return fBias; } 282 TileMode tileMode() const { return fTileMode; } 283 bool convolveAlpha() const { return fConvolveAlpha; } 284 285 typedef GrGLMatrixConvolutionEffect GLEffect; 286 287 288 289 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; 290 virtual bool isEqual(const GrEffect&) const SK_OVERRIDE; 291 292private: 293 GrMatrixConvolutionEffect(GrTexture*, 294 const SkISize& kernelSize, 295 const SkScalar* kernel, 296 SkScalar gain, 297 SkScalar bias, 298 const SkIPoint& target, 299 TileMode tileMode, 300 bool convolveAlpha); 301 302 SkISize fKernelSize; 303 float *fKernel; 304 float fGain; 305 float fBias; 306 float fTarget[2]; 307 TileMode fTileMode; 308 bool fConvolveAlpha; 309 310 GR_DECLARE_EFFECT_TEST; 311 312 typedef GrSingleTextureEffect INHERITED; 313}; 314 315class GrGLMatrixConvolutionEffect : public GrGLEffect { 316public: 317 GrGLMatrixConvolutionEffect(const GrBackendEffectFactory& factory, 318 const GrEffect& effect); 319 virtual void emitCode(GrGLShaderBuilder*, 320 const GrEffectStage&, 321 EffectKey, 322 const char* vertexCoords, 323 const char* outputColor, 324 const char* inputColor, 325 const TextureSamplerArray&) SK_OVERRIDE; 326 327 static inline EffectKey GenKey(const GrEffectStage&, const GrGLCaps&); 328 329 virtual void setData(const GrGLUniformManager&, const GrEffectStage&) SK_OVERRIDE; 330 331private: 332 typedef GrGLUniformManager::UniformHandle UniformHandle; 333 typedef SkMatrixConvolutionImageFilter::TileMode TileMode; 334 SkISize fKernelSize; 335 TileMode fTileMode; 336 bool fConvolveAlpha; 337 338 UniformHandle fKernelUni; 339 UniformHandle fImageIncrementUni; 340 UniformHandle fTargetUni; 341 UniformHandle fGainUni; 342 UniformHandle fBiasUni; 343 344 GrGLEffectMatrix fEffectMatrix; 345 346 typedef GrGLEffect INHERITED; 347}; 348 349GrGLMatrixConvolutionEffect::GrGLMatrixConvolutionEffect(const GrBackendEffectFactory& factory, 350 const GrEffect& effect) 351 : INHERITED(factory) 352 , fKernelUni(GrGLUniformManager::kInvalidUniformHandle) 353 , fImageIncrementUni(GrGLUniformManager::kInvalidUniformHandle) 354 , fTargetUni(GrGLUniformManager::kInvalidUniformHandle) 355 , fGainUni(GrGLUniformManager::kInvalidUniformHandle) 356 , fBiasUni(GrGLUniformManager::kInvalidUniformHandle) { 357 const GrMatrixConvolutionEffect& m = static_cast<const GrMatrixConvolutionEffect&>(effect); 358 fKernelSize = m.kernelSize(); 359 fTileMode = m.tileMode(); 360 fConvolveAlpha = m.convolveAlpha(); 361} 362 363static void appendTextureLookup(GrGLShaderBuilder* builder, 364 const GrGLShaderBuilder::TextureSampler& sampler, 365 const char* coord, 366 SkMatrixConvolutionImageFilter::TileMode tileMode) { 367 SkString* code = &builder->fFSCode; 368 SkString clampedCoord; 369 switch (tileMode) { 370 case SkMatrixConvolutionImageFilter::kClamp_TileMode: 371 clampedCoord.printf("clamp(%s, 0.0, 1.0)", coord); 372 coord = clampedCoord.c_str(); 373 break; 374 case SkMatrixConvolutionImageFilter::kRepeat_TileMode: 375 clampedCoord.printf("fract(%s)", coord); 376 coord = clampedCoord.c_str(); 377 break; 378 case SkMatrixConvolutionImageFilter::kClampToBlack_TileMode: 379 code->appendf("clamp(%s, 0.0, 1.0) != %s ? vec4(0, 0, 0, 0) : ", coord, coord); 380 break; 381 } 382 builder->appendTextureLookup(code, sampler, coord); 383} 384 385void GrGLMatrixConvolutionEffect::emitCode(GrGLShaderBuilder* builder, 386 const GrEffectStage&, 387 EffectKey key, 388 const char* vertexCoords, 389 const char* outputColor, 390 const char* inputColor, 391 const TextureSamplerArray& samplers) { 392 const char* coords; 393 fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, vertexCoords, &coords); 394 fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, 395 kVec2f_GrSLType, "ImageIncrement"); 396 fKernelUni = builder->addUniformArray(GrGLShaderBuilder::kFragment_ShaderType, 397 kFloat_GrSLType, "Kernel", fKernelSize.width() * fKernelSize.height()); 398 fTargetUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, 399 kVec2f_GrSLType, "Target"); 400 fGainUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, 401 kFloat_GrSLType, "Gain"); 402 fBiasUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, 403 kFloat_GrSLType, "Bias"); 404 405 SkString* code = &builder->fFSCode; 406 407 const char* target = builder->getUniformCStr(fTargetUni); 408 const char* imgInc = builder->getUniformCStr(fImageIncrementUni); 409 const char* kernel = builder->getUniformCStr(fKernelUni); 410 const char* gain = builder->getUniformCStr(fGainUni); 411 const char* bias = builder->getUniformCStr(fBiasUni); 412 int kWidth = fKernelSize.width(); 413 int kHeight = fKernelSize.height(); 414 415 code->appendf("\t\tvec4 sum = vec4(0, 0, 0, 0);\n"); 416 code->appendf("\t\tvec2 coord = %s - %s * %s;\n", coords, target, imgInc); 417 code->appendf("\t\tfor (int y = 0; y < %d; y++) {\n", kHeight); 418 code->appendf("\t\t\tfor (int x = 0; x < %d; x++) {\n", kWidth); 419 code->appendf("\t\t\t\tfloat k = %s[y * %d + x];\n", kernel, kWidth); 420 code->appendf("\t\t\t\tvec2 coord2 = coord + vec2(x, y) * %s;\n", imgInc); 421 code->appendf("\t\t\t\tvec4 c = "); 422 appendTextureLookup(builder, samplers[0], "coord2", fTileMode); 423 code->appendf(";\n"); 424 if (!fConvolveAlpha) { 425 code->appendf("\t\t\t\tc.rgb /= c.a;\n"); 426 } 427 code->appendf("\t\t\t\tsum += c * k;\n"); 428 code->appendf("\t\t\t}\n"); 429 code->appendf("\t\t}\n"); 430 if (fConvolveAlpha) { 431 code->appendf("\t\t%s = sum * %s + %s;\n", outputColor, gain, bias); 432 code->appendf("\t\t%s.rgb = clamp(%s.rgb, 0.0, %s.a);\n", outputColor, outputColor, outputColor); 433 } else { 434 code->appendf("\t\tvec4 c = "); 435 appendTextureLookup(builder, samplers[0], coords, fTileMode); 436 code->appendf(";\n"); 437 code->appendf("\t\t%s.a = c.a;\n", outputColor); 438 code->appendf("\t\t%s.rgb = sum.rgb * %s + %s;\n", outputColor, gain, bias); 439 code->appendf("\t\t%s.rgb *= %s.a;\n", outputColor, outputColor); 440 } 441} 442 443namespace { 444 445int encodeXY(int x, int y) { 446 SkASSERT(x >= 1 && y >= 1 && x * y <= 32); 447 if (y < x) 448 return 0x40 | encodeXY(y, x); 449 else 450 return (0x40 >> x) | (y - x); 451} 452 453}; 454 455GrGLEffect::EffectKey GrGLMatrixConvolutionEffect::GenKey(const GrEffectStage& s, const GrGLCaps&) { 456 const GrMatrixConvolutionEffect& m = 457 static_cast<const GrMatrixConvolutionEffect&>(*s.getEffect()); 458 EffectKey key = encodeXY(m.kernelSize().width(), m.kernelSize().height()); 459 key |= m.tileMode() << 7; 460 key |= m.convolveAlpha() ? 1 << 9 : 0; 461 key <<= GrGLEffectMatrix::kKeyBits; 462 EffectKey matrixKey = GrGLEffectMatrix::GenKey(m.getMatrix(), 463 s.getCoordChangeMatrix(), 464 m.texture(0)); 465 return key | matrixKey; 466} 467 468void GrGLMatrixConvolutionEffect::setData(const GrGLUniformManager& uman, 469 const GrEffectStage& stage) { 470 const GrMatrixConvolutionEffect& effect = 471 static_cast<const GrMatrixConvolutionEffect&>(*stage.getEffect()); 472 GrTexture& texture = *effect.texture(0); 473 // the code we generated was for a specific kernel size 474 GrAssert(effect.kernelSize() == fKernelSize); 475 GrAssert(effect.tileMode() == fTileMode); 476 float imageIncrement[2]; 477 float ySign = texture.origin() == GrSurface::kTopLeft_Origin ? 1.0f : -1.0f; 478 imageIncrement[0] = 1.0f / texture.width(); 479 imageIncrement[1] = ySign / texture.height(); 480 uman.set2fv(fImageIncrementUni, 0, 1, imageIncrement); 481 uman.set2fv(fTargetUni, 0, 1, effect.target()); 482 uman.set1fv(fKernelUni, 0, fKernelSize.width() * fKernelSize.height(), effect.kernel()); 483 uman.set1f(fGainUni, effect.gain()); 484 uman.set1f(fBiasUni, effect.bias()); 485 fEffectMatrix.setData(uman, 486 effect.getMatrix(), 487 stage.getCoordChangeMatrix(), 488 effect.texture(0)); 489} 490 491GrMatrixConvolutionEffect::GrMatrixConvolutionEffect(GrTexture* texture, 492 const SkISize& kernelSize, 493 const SkScalar* kernel, 494 SkScalar gain, 495 SkScalar bias, 496 const SkIPoint& target, 497 TileMode tileMode, 498 bool convolveAlpha) 499 : INHERITED(texture, MakeDivByTextureWHMatrix(texture)), 500 fKernelSize(kernelSize), 501 fGain(SkScalarToFloat(gain)), 502 fBias(SkScalarToFloat(bias) / 255.0f), 503 fTileMode(tileMode), 504 fConvolveAlpha(convolveAlpha) { 505 fKernel = new float[kernelSize.width() * kernelSize.height()]; 506 for (int i = 0; i < kernelSize.width() * kernelSize.height(); i++) { 507 fKernel[i] = SkScalarToFloat(kernel[i]); 508 } 509 fTarget[0] = static_cast<float>(target.x()); 510 fTarget[1] = static_cast<float>(target.y()); 511} 512 513GrMatrixConvolutionEffect::~GrMatrixConvolutionEffect() { 514 delete[] fKernel; 515} 516 517const GrBackendEffectFactory& GrMatrixConvolutionEffect::getFactory() const { 518 return GrTBackendEffectFactory<GrMatrixConvolutionEffect>::getInstance(); 519} 520 521bool GrMatrixConvolutionEffect::isEqual(const GrEffect& sBase) const { 522 const GrMatrixConvolutionEffect& s = 523 static_cast<const GrMatrixConvolutionEffect&>(sBase); 524 return INHERITED::isEqual(sBase) && 525 fKernelSize == s.kernelSize() && 526 !memcmp(fKernel, s.kernel(), fKernelSize.width() * fKernelSize.height() * sizeof(float)) && 527 fGain == s.gain() && 528 fBias == s.bias() && 529 fTarget == s.target() && 530 fTileMode == s.tileMode() && 531 fConvolveAlpha == s.convolveAlpha(); 532} 533 534GR_DEFINE_EFFECT_TEST(GrMatrixConvolutionEffect); 535 536// A little bit less than the minimum # uniforms required by DX9SM2 (32). 537// Allows for a 5x5 kernel (or 25x1, for that matter). 538#define MAX_KERNEL_SIZE 25 539 540GrEffectRef* GrMatrixConvolutionEffect::TestCreate(SkRandom* random, 541 GrContext* context, 542 GrTexture* textures[]) { 543 int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx : 544 GrEffectUnitTest::kAlphaTextureIdx; 545 int width = random->nextRangeU(1, MAX_KERNEL_SIZE); 546 int height = random->nextRangeU(1, MAX_KERNEL_SIZE / width); 547 SkISize kernelSize = SkISize::Make(width, height); 548 SkScalar* kernel = new SkScalar[width * height]; 549 for (int i = 0; i < width * height; i++) { 550 kernel[i] = random->nextSScalar1(); 551 } 552 SkScalar gain = random->nextSScalar1(); 553 SkScalar bias = random->nextSScalar1(); 554 SkIPoint target = SkIPoint::Make(random->nextRangeU(0, kernelSize.width()), 555 random->nextRangeU(0, kernelSize.height())); 556 TileMode tileMode = static_cast<TileMode>(random->nextRangeU(0, 2)); 557 bool convolveAlpha = random->nextBool(); 558 return GrMatrixConvolutionEffect::Create(textures[texIdx], 559 kernelSize, 560 kernel, 561 gain, 562 bias, 563 target, 564 tileMode, 565 convolveAlpha); 566 567} 568 569bool SkMatrixConvolutionImageFilter::asNewEffect(GrEffectRef** effect, 570 GrTexture* texture) const { 571 bool ok = fKernelSize.width() * fKernelSize.height() <= MAX_KERNEL_SIZE; 572 if (ok && effect) { 573 *effect = GrMatrixConvolutionEffect::Create(texture, 574 fKernelSize, 575 fKernel, 576 fGain, 577 fBias, 578 fTarget, 579 fTileMode, 580 fConvolveAlpha); 581 } 582 return ok; 583} 584 585/////////////////////////////////////////////////////////////////////////////// 586 587#endif 588