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      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 "gl/GrGLEffectMatrix.h"
     18 #include "effects/GrSingleTextureEffect.h"
     19 #include "GrTBackendEffectFactory.h"
     20 #include "GrTexture.h"
     21 #include "SkMatrix.h"
     22 
     23 #endif
     24 
     25 SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(const SkISize& kernelSize, const SkScalar* kernel, SkScalar gain, SkScalar bias, const SkIPoint& target, TileMode tileMode, bool convolveAlpha, SkImageFilter* input)
     26   : INHERITED(input),
     27     fKernelSize(kernelSize),
     28     fGain(gain),
     29     fBias(bias),
     30     fTarget(target),
     31     fTileMode(tileMode),
     32     fConvolveAlpha(convolveAlpha) {
     33     uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight;
     34     fKernel = SkNEW_ARRAY(SkScalar, size);
     35     memcpy(fKernel, kernel, size * sizeof(SkScalar));
     36     SkASSERT(kernelSize.fWidth >= 1 && kernelSize.fHeight >= 1);
     37     SkASSERT(target.fX >= 0 && target.fX < kernelSize.fWidth);
     38     SkASSERT(target.fY >= 0 && target.fY < kernelSize.fHeight);
     39 }
     40 
     41 SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
     42     fKernelSize.fWidth = buffer.readInt();
     43     fKernelSize.fHeight = buffer.readInt();
     44     uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight;
     45     fKernel = SkNEW_ARRAY(SkScalar, size);
     46     SkDEBUGCODE(uint32_t readSize = )buffer.readScalarArray(fKernel);
     47     SkASSERT(readSize == size);
     48     fGain = buffer.readScalar();
     49     fBias = buffer.readScalar();
     50     fTarget.fX = buffer.readInt();
     51     fTarget.fY = buffer.readInt();
     52     fTileMode = (TileMode) buffer.readInt();
     53     fConvolveAlpha = buffer.readBool();
     54 }
     55 
     56 void SkMatrixConvolutionImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
     57     this->INHERITED::flatten(buffer);
     58     buffer.writeInt(fKernelSize.fWidth);
     59     buffer.writeInt(fKernelSize.fHeight);
     60     buffer.writeScalarArray(fKernel, fKernelSize.fWidth * fKernelSize.fHeight);
     61     buffer.writeScalar(fGain);
     62     buffer.writeScalar(fBias);
     63     buffer.writeInt(fTarget.fX);
     64     buffer.writeInt(fTarget.fY);
     65     buffer.writeInt((int) fTileMode);
     66     buffer.writeBool(fConvolveAlpha);
     67 }
     68 
     69 SkMatrixConvolutionImageFilter::~SkMatrixConvolutionImageFilter() {
     70     delete[] fKernel;
     71 }
     72 
     73 class UncheckedPixelFetcher {
     74 public:
     75     static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
     76         return *src.getAddr32(x, y);
     77     }
     78 };
     79 
     80 class ClampPixelFetcher {
     81 public:
     82     static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
     83         x = SkClampMax(x, src.width() - 1);
     84         y = SkClampMax(y, src.height() - 1);
     85         return *src.getAddr32(x, y);
     86     }
     87 };
     88 
     89 class RepeatPixelFetcher {
     90 public:
     91     static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
     92         x %= src.width();
     93         y %= src.height();
     94         if (x < 0) {
     95             x += src.width();
     96         }
     97         if (y < 0) {
     98             y += src.height();
     99         }
    100         return *src.getAddr32(x, y);
    101     }
    102 };
    103 
    104 class ClampToBlackPixelFetcher {
    105 public:
    106     static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
    107         if (x < 0 || x >= src.width() || y < 0 || y >= src.height()) {
    108             return 0;
    109         } else {
    110             return *src.getAddr32(x, y);
    111         }
    112     }
    113 };
    114 
    115 template<class PixelFetcher, bool convolveAlpha>
    116 void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
    117     for (int y = rect.fTop; y < rect.fBottom; ++y) {
    118         SkPMColor* dptr = result->getAddr32(rect.fLeft, y);
    119         for (int x = rect.fLeft; x < rect.fRight; ++x) {
    120             SkScalar sumA = 0, sumR = 0, sumG = 0, sumB = 0;
    121             for (int cy = 0; cy < fKernelSize.fHeight; cy++) {
    122                 for (int cx = 0; cx < fKernelSize.fWidth; cx++) {
    123                     SkPMColor s = PixelFetcher::fetch(src, x + cx - fTarget.fX, y + cy - fTarget.fY);
    124                     SkScalar k = fKernel[cy * fKernelSize.fWidth + cx];
    125                     if (convolveAlpha) {
    126                         sumA += SkScalarMul(SkIntToScalar(SkGetPackedA32(s)), k);
    127                     }
    128                     sumR += SkScalarMul(SkIntToScalar(SkGetPackedR32(s)), k);
    129                     sumG += SkScalarMul(SkIntToScalar(SkGetPackedG32(s)), k);
    130                     sumB += SkScalarMul(SkIntToScalar(SkGetPackedB32(s)), k);
    131                 }
    132             }
    133             int a = convolveAlpha
    134                   ? SkClampMax(SkScalarFloorToInt(SkScalarMul(sumA, fGain) + fBias), 255)
    135                   : 255;
    136             int r = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumR, fGain) + fBias), a);
    137             int g = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumG, fGain) + fBias), a);
    138             int b = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumB, fGain) + fBias), a);
    139             if (!convolveAlpha) {
    140                 a = SkGetPackedA32(PixelFetcher::fetch(src, x, y));
    141                 *dptr++ = SkPreMultiplyARGB(a, r, g, b);
    142             } else {
    143                 *dptr++ = SkPackARGB32(a, r, g, b);
    144             }
    145         }
    146     }
    147 }
    148 
    149 template<class PixelFetcher>
    150 void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
    151     if (fConvolveAlpha) {
    152         filterPixels<PixelFetcher, true>(src, result, rect);
    153     } else {
    154         filterPixels<PixelFetcher, false>(src, result, rect);
    155     }
    156 }
    157 
    158 void SkMatrixConvolutionImageFilter::filterInteriorPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
    159     filterPixels<UncheckedPixelFetcher>(src, result, rect);
    160 }
    161 
    162 void SkMatrixConvolutionImageFilter::filterBorderPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
    163     switch (fTileMode) {
    164         case kClamp_TileMode:
    165             filterPixels<ClampPixelFetcher>(src, result, rect);
    166             break;
    167         case kRepeat_TileMode:
    168             filterPixels<RepeatPixelFetcher>(src, result, rect);
    169             break;
    170         case kClampToBlack_TileMode:
    171             filterPixels<ClampToBlackPixelFetcher>(src, result, rect);
    172             break;
    173     }
    174 }
    175 
    176 // FIXME:  This should be refactored to SkSingleInputImageFilter for
    177 // use by other filters.  For now, we assume the input is always
    178 // premultiplied and unpremultiply it
    179 static 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 
    201 bool 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 
    245 class GrGLMatrixConvolutionEffect;
    246 
    247 class GrMatrixConvolutionEffect : public GrSingleTextureEffect {
    248 public:
    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         AutoEffectUnref effect(SkNEW_ARGS(GrMatrixConvolutionEffect, (texture,
    259                                                                       kernelSize,
    260                                                                       kernel,
    261                                                                       gain,
    262                                                                       bias,
    263                                                                       target,
    264                                                                       tileMode,
    265                                                                       convolveAlpha)));
    266         return CreateEffectRef(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 
    291 private:
    292     GrMatrixConvolutionEffect(GrTexture*,
    293                               const SkISize& kernelSize,
    294                               const SkScalar* kernel,
    295                               SkScalar gain,
    296                               SkScalar bias,
    297                               const SkIPoint& target,
    298                               TileMode tileMode,
    299                               bool convolveAlpha);
    300 
    301     virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
    302 
    303     SkISize  fKernelSize;
    304     float   *fKernel;
    305     float    fGain;
    306     float    fBias;
    307     float    fTarget[2];
    308     TileMode fTileMode;
    309     bool     fConvolveAlpha;
    310 
    311     GR_DECLARE_EFFECT_TEST;
    312 
    313     typedef GrSingleTextureEffect INHERITED;
    314 };
    315 
    316 class GrGLMatrixConvolutionEffect : public GrGLEffect {
    317 public:
    318     GrGLMatrixConvolutionEffect(const GrBackendEffectFactory& factory,
    319                                 const GrEffectRef& effect);
    320     virtual void emitCode(GrGLShaderBuilder*,
    321                           const GrEffectStage&,
    322                           EffectKey,
    323                           const char* vertexCoords,
    324                           const char* outputColor,
    325                           const char* inputColor,
    326                           const TextureSamplerArray&) SK_OVERRIDE;
    327 
    328     static inline EffectKey GenKey(const GrEffectStage&, const GrGLCaps&);
    329 
    330     virtual void setData(const GrGLUniformManager&, const GrEffectStage&) SK_OVERRIDE;
    331 
    332 private:
    333     typedef GrGLUniformManager::UniformHandle        UniformHandle;
    334     typedef SkMatrixConvolutionImageFilter::TileMode TileMode;
    335     SkISize             fKernelSize;
    336     TileMode            fTileMode;
    337     bool                fConvolveAlpha;
    338 
    339     UniformHandle       fKernelUni;
    340     UniformHandle       fImageIncrementUni;
    341     UniformHandle       fTargetUni;
    342     UniformHandle       fGainUni;
    343     UniformHandle       fBiasUni;
    344 
    345     GrGLEffectMatrix    fEffectMatrix;
    346 
    347     typedef GrGLEffect INHERITED;
    348 };
    349 
    350 GrGLMatrixConvolutionEffect::GrGLMatrixConvolutionEffect(const GrBackendEffectFactory& factory,
    351                                                          const GrEffectRef& effect)
    352     : INHERITED(factory)
    353     , fKernelUni(GrGLUniformManager::kInvalidUniformHandle)
    354     , fImageIncrementUni(GrGLUniformManager::kInvalidUniformHandle)
    355     , fTargetUni(GrGLUniformManager::kInvalidUniformHandle)
    356     , fGainUni(GrGLUniformManager::kInvalidUniformHandle)
    357     , fBiasUni(GrGLUniformManager::kInvalidUniformHandle) {
    358     const GrMatrixConvolutionEffect& m = CastEffect<GrMatrixConvolutionEffect>(effect);
    359     fKernelSize = m.kernelSize();
    360     fTileMode = m.tileMode();
    361     fConvolveAlpha = m.convolveAlpha();
    362 }
    363 
    364 static void appendTextureLookup(GrGLShaderBuilder* builder,
    365                                 const GrGLShaderBuilder::TextureSampler& sampler,
    366                                 const char* coord,
    367                                 SkMatrixConvolutionImageFilter::TileMode tileMode) {
    368     SkString* code = &builder->fFSCode;
    369     SkString clampedCoord;
    370     switch (tileMode) {
    371         case SkMatrixConvolutionImageFilter::kClamp_TileMode:
    372             clampedCoord.printf("clamp(%s, 0.0, 1.0)", coord);
    373             coord = clampedCoord.c_str();
    374             break;
    375         case SkMatrixConvolutionImageFilter::kRepeat_TileMode:
    376             clampedCoord.printf("fract(%s)", coord);
    377             coord = clampedCoord.c_str();
    378             break;
    379         case SkMatrixConvolutionImageFilter::kClampToBlack_TileMode:
    380             code->appendf("clamp(%s, 0.0, 1.0) != %s ? vec4(0, 0, 0, 0) : ", coord, coord);
    381             break;
    382     }
    383     builder->appendTextureLookup(code, sampler, coord);
    384 }
    385 
    386 void GrGLMatrixConvolutionEffect::emitCode(GrGLShaderBuilder* builder,
    387                                            const GrEffectStage&,
    388                                            EffectKey key,
    389                                            const char* vertexCoords,
    390                                            const char* outputColor,
    391                                            const char* inputColor,
    392                                            const TextureSamplerArray& samplers) {
    393     const char* coords;
    394     fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, vertexCoords, &coords);
    395     fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
    396                                              kVec2f_GrSLType, "ImageIncrement");
    397     fKernelUni = builder->addUniformArray(GrGLShaderBuilder::kFragment_ShaderType,
    398                                              kFloat_GrSLType, "Kernel", fKernelSize.width() * fKernelSize.height());
    399     fTargetUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
    400                                              kVec2f_GrSLType, "Target");
    401     fGainUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
    402                                    kFloat_GrSLType, "Gain");
    403     fBiasUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
    404                                    kFloat_GrSLType, "Bias");
    405 
    406     SkString* code = &builder->fFSCode;
    407 
    408     const char* target = builder->getUniformCStr(fTargetUni);
    409     const char* imgInc = builder->getUniformCStr(fImageIncrementUni);
    410     const char* kernel = builder->getUniformCStr(fKernelUni);
    411     const char* gain = builder->getUniformCStr(fGainUni);
    412     const char* bias = builder->getUniformCStr(fBiasUni);
    413     int kWidth = fKernelSize.width();
    414     int kHeight = fKernelSize.height();
    415 
    416     code->appendf("\t\tvec4 sum = vec4(0, 0, 0, 0);\n");
    417     code->appendf("\t\tvec2 coord = %s - %s * %s;\n", coords, target, imgInc);
    418     code->appendf("\t\tfor (int y = 0; y < %d; y++) {\n", kHeight);
    419     code->appendf("\t\t\tfor (int x = 0; x < %d; x++) {\n", kWidth);
    420     code->appendf("\t\t\t\tfloat k = %s[y * %d + x];\n", kernel, kWidth);
    421     code->appendf("\t\t\t\tvec2 coord2 = coord + vec2(x, y) * %s;\n", imgInc);
    422     code->appendf("\t\t\t\tvec4 c = ");
    423     appendTextureLookup(builder, samplers[0], "coord2", fTileMode);
    424     code->appendf(";\n");
    425     if (!fConvolveAlpha) {
    426         code->appendf("\t\t\t\tc.rgb /= c.a;\n");
    427     }
    428     code->appendf("\t\t\t\tsum += c * k;\n");
    429     code->appendf("\t\t\t}\n");
    430     code->appendf("\t\t}\n");
    431     if (fConvolveAlpha) {
    432         code->appendf("\t\t%s = sum * %s + %s;\n", outputColor, gain, bias);
    433         code->appendf("\t\t%s.rgb = clamp(%s.rgb, 0.0, %s.a);\n", outputColor, outputColor, outputColor);
    434     } else {
    435         code->appendf("\t\tvec4 c = ");
    436         appendTextureLookup(builder, samplers[0], coords, fTileMode);
    437         code->appendf(";\n");
    438         code->appendf("\t\t%s.a = c.a;\n", outputColor);
    439         code->appendf("\t\t%s.rgb = sum.rgb * %s + %s;\n", outputColor, gain, bias);
    440         code->appendf("\t\t%s.rgb *= %s.a;\n", outputColor, outputColor);
    441     }
    442 }
    443 
    444 namespace {
    445 
    446 int encodeXY(int x, int y) {
    447     SkASSERT(x >= 1 && y >= 1 && x * y <= 32);
    448     if (y < x)
    449         return 0x40 | encodeXY(y, x);
    450     else
    451         return (0x40 >> x) | (y - x);
    452 }
    453 
    454 };
    455 
    456 GrGLEffect::EffectKey GrGLMatrixConvolutionEffect::GenKey(const GrEffectStage& s, const GrGLCaps&) {
    457     const GrMatrixConvolutionEffect& m = GetEffectFromStage<GrMatrixConvolutionEffect>(s);
    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 
    468 void GrGLMatrixConvolutionEffect::setData(const GrGLUniformManager& uman,
    469                                           const GrEffectStage& stage) {
    470     const GrMatrixConvolutionEffect& effect = GetEffectFromStage<GrMatrixConvolutionEffect>(stage);
    471     GrTexture& texture = *effect.texture(0);
    472     // the code we generated was for a specific kernel size
    473     GrAssert(effect.kernelSize() == fKernelSize);
    474     GrAssert(effect.tileMode() == fTileMode);
    475     float imageIncrement[2];
    476     float ySign = texture.origin() == kTopLeft_GrSurfaceOrigin ? 1.0f : -1.0f;
    477     imageIncrement[0] = 1.0f / texture.width();
    478     imageIncrement[1] = ySign / texture.height();
    479     uman.set2fv(fImageIncrementUni, 0, 1, imageIncrement);
    480     uman.set2fv(fTargetUni, 0, 1, effect.target());
    481     uman.set1fv(fKernelUni, 0, fKernelSize.width() * fKernelSize.height(), effect.kernel());
    482     uman.set1f(fGainUni, effect.gain());
    483     uman.set1f(fBiasUni, effect.bias());
    484     fEffectMatrix.setData(uman,
    485                           effect.getMatrix(),
    486                           stage.getCoordChangeMatrix(),
    487                           effect.texture(0));
    488 }
    489 
    490 GrMatrixConvolutionEffect::GrMatrixConvolutionEffect(GrTexture* texture,
    491                                                      const SkISize& kernelSize,
    492                                                      const SkScalar* kernel,
    493                                                      SkScalar gain,
    494                                                      SkScalar bias,
    495                                                      const SkIPoint& target,
    496                                                      TileMode tileMode,
    497                                                      bool convolveAlpha)
    498   : INHERITED(texture, MakeDivByTextureWHMatrix(texture)),
    499     fKernelSize(kernelSize),
    500     fGain(SkScalarToFloat(gain)),
    501     fBias(SkScalarToFloat(bias) / 255.0f),
    502     fTileMode(tileMode),
    503     fConvolveAlpha(convolveAlpha) {
    504     fKernel = new float[kernelSize.width() * kernelSize.height()];
    505     for (int i = 0; i < kernelSize.width() * kernelSize.height(); i++) {
    506         fKernel[i] = SkScalarToFloat(kernel[i]);
    507     }
    508     fTarget[0] = static_cast<float>(target.x());
    509     fTarget[1] = static_cast<float>(target.y());
    510 }
    511 
    512 GrMatrixConvolutionEffect::~GrMatrixConvolutionEffect() {
    513     delete[] fKernel;
    514 }
    515 
    516 const GrBackendEffectFactory& GrMatrixConvolutionEffect::getFactory() const {
    517     return GrTBackendEffectFactory<GrMatrixConvolutionEffect>::getInstance();
    518 }
    519 
    520 bool GrMatrixConvolutionEffect::onIsEqual(const GrEffect& sBase) const {
    521     const GrMatrixConvolutionEffect& s = CastEffect<GrMatrixConvolutionEffect>(sBase);
    522     return this->texture(0) == s.texture(0) &&
    523            fKernelSize == s.kernelSize() &&
    524            !memcmp(fKernel, s.kernel(), fKernelSize.width() * fKernelSize.height() * sizeof(float)) &&
    525            fGain == s.gain() &&
    526            fBias == s.bias() &&
    527            fTarget == s.target() &&
    528            fTileMode == s.tileMode() &&
    529            fConvolveAlpha == s.convolveAlpha();
    530 }
    531 
    532 GR_DEFINE_EFFECT_TEST(GrMatrixConvolutionEffect);
    533 
    534 // A little bit less than the minimum # uniforms required by DX9SM2 (32).
    535 // Allows for a 5x5 kernel (or 25x1, for that matter).
    536 #define MAX_KERNEL_SIZE 25
    537 
    538 GrEffectRef* GrMatrixConvolutionEffect::TestCreate(SkRandom* random,
    539                                                    GrContext* context,
    540                                                    GrTexture* textures[]) {
    541     int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx :
    542                                       GrEffectUnitTest::kAlphaTextureIdx;
    543     int width = random->nextRangeU(1, MAX_KERNEL_SIZE);
    544     int height = random->nextRangeU(1, MAX_KERNEL_SIZE / width);
    545     SkISize kernelSize = SkISize::Make(width, height);
    546     SkScalar* kernel = new SkScalar[width * height];
    547     for (int i = 0; i < width * height; i++) {
    548         kernel[i] = random->nextSScalar1();
    549     }
    550     SkScalar gain = random->nextSScalar1();
    551     SkScalar bias = random->nextSScalar1();
    552     SkIPoint target = SkIPoint::Make(random->nextRangeU(0, kernelSize.width()),
    553                                      random->nextRangeU(0, kernelSize.height()));
    554     TileMode tileMode = static_cast<TileMode>(random->nextRangeU(0, 2));
    555     bool convolveAlpha = random->nextBool();
    556     return GrMatrixConvolutionEffect::Create(textures[texIdx],
    557                                              kernelSize,
    558                                              kernel,
    559                                              gain,
    560                                              bias,
    561                                              target,
    562                                              tileMode,
    563                                              convolveAlpha);
    564 
    565 }
    566 
    567 bool SkMatrixConvolutionImageFilter::asNewEffect(GrEffectRef** effect,
    568                                                  GrTexture* texture) const {
    569     bool ok = fKernelSize.width() * fKernelSize.height() <= MAX_KERNEL_SIZE;
    570     if (ok && effect) {
    571         *effect = GrMatrixConvolutionEffect::Create(texture,
    572                                                     fKernelSize,
    573                                                     fKernel,
    574                                                     fGain,
    575                                                     fBias,
    576                                                      fTarget,
    577                                                      fTileMode,
    578                                                      fConvolveAlpha);
    579     }
    580     return ok;
    581 }
    582 
    583 ///////////////////////////////////////////////////////////////////////////////
    584 
    585 #endif
    586