SkMatrixConvolutionImageFilter.cpp revision 3bc16c8bc1ecb9ac4450f58093cc9e3edb8a50b8 
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/GrGLProgramStage.h"
17#endif
18
19SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(const SkISize& kernelSize, const SkScalar* kernel, SkScalar gain, SkScalar bias, const SkIPoint& target, TileMode tileMode, bool convolveAlpha, SkImageFilter* input)
20  : INHERITED(input),
21    fKernelSize(kernelSize),
22    fGain(gain),
23    fBias(bias),
24    fTarget(target),
25    fTileMode(tileMode),
26    fConvolveAlpha(convolveAlpha) {
27    uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight;
28    fKernel = SkNEW_ARRAY(SkScalar, size);
29    memcpy(fKernel, kernel, size * sizeof(SkScalar));
30    SkASSERT(kernelSize.fWidth >= 1 && kernelSize.fHeight >= 1);
31    SkASSERT(target.fX >= 0 && target.fX < kernelSize.fWidth);
32    SkASSERT(target.fY >= 0 && target.fY < kernelSize.fHeight);
33}
34
35SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
36    fKernelSize.fWidth = buffer.readInt();
37    fKernelSize.fHeight = buffer.readInt();
38    uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight;
39    fKernel = SkNEW_ARRAY(SkScalar, size);
40    uint32_t readSize = buffer.readScalarArray(fKernel);
41    SkASSERT(readSize == size);
42    fGain = buffer.readScalar();
43    fBias = buffer.readScalar();
44    fTarget.fX = buffer.readScalar();
45    fTarget.fY = buffer.readScalar();
46    fTileMode = (TileMode) buffer.readInt();
47    fConvolveAlpha = buffer.readBool();
48}
49
50void SkMatrixConvolutionImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
51    this->INHERITED::flatten(buffer);
52    buffer.writeInt(fKernelSize.fWidth);
53    buffer.writeInt(fKernelSize.fHeight);
54    buffer.writeScalarArray(fKernel, fKernelSize.fWidth * fKernelSize.fHeight);
55    buffer.writeScalar(fGain);
56    buffer.writeScalar(fBias);
57    buffer.writeScalar(fTarget.fX);
58    buffer.writeScalar(fTarget.fY);
59    buffer.writeInt((int) fTileMode);
60    buffer.writeBool(fConvolveAlpha);
61}
62
63SkMatrixConvolutionImageFilter::~SkMatrixConvolutionImageFilter() {
64    delete[] fKernel;
65}
66
67class UncheckedPixelFetcher {
68public:
69    static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
70        return *src.getAddr32(x, y);
71    }
72};
73
74class ClampPixelFetcher {
75public:
76    static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
77        x = SkClampMax(x, src.width() - 1);
78        y = SkClampMax(y, src.height() - 1);
79        return *src.getAddr32(x, y);
80    }
81};
82
83class RepeatPixelFetcher {
84public:
85    static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
86        x %= src.width();
87        y %= src.height();
88        if (x < 0) {
89            x += src.width();
90        }
91        if (y < 0) {
92            y += src.height();
93        }
94        return *src.getAddr32(x, y);
95    }
96};
97
98class ClampToBlackPixelFetcher {
99public:
100    static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
101        if (x < 0 || x >= src.width() || y < 0 || y >= src.height()) {
102            return 0;
103        } else {
104            return *src.getAddr32(x, y);
105        }
106    }
107};
108
109template<class PixelFetcher, bool convolveAlpha>
110void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
111    for (int y = rect.fTop; y < rect.fBottom; ++y) {
112        SkPMColor* dptr = result->getAddr32(rect.fLeft, y);
113        for (int x = rect.fLeft; x < rect.fRight; ++x) {
114            SkScalar sumA = 0, sumR = 0, sumG = 0, sumB = 0;
115            for (int cy = 0; cy < fKernelSize.fHeight; cy++) {
116                for (int cx = 0; cx < fKernelSize.fWidth; cx++) {
117                    SkPMColor s = PixelFetcher::fetch(src, x + cx - fTarget.fX, y + cy - fTarget.fY);
118                    SkScalar k = fKernel[cy * fKernelSize.fWidth + cx];
119                    if (convolveAlpha) {
120                        sumA += SkScalarMul(SkIntToScalar(SkGetPackedA32(s)), k);
121                    }
122                    sumR += SkScalarMul(SkIntToScalar(SkGetPackedR32(s)), k);
123                    sumG += SkScalarMul(SkIntToScalar(SkGetPackedG32(s)), k);
124                    sumB += SkScalarMul(SkIntToScalar(SkGetPackedB32(s)), k);
125                }
126            }
127            int a = convolveAlpha
128                  ? SkClampMax(SkScalarFloorToInt(SkScalarMul(sumA, fGain) + fBias), 255)
129                  : 255;
130            int r = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumR, fGain) + fBias), a);
131            int g = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumG, fGain) + fBias), a);
132            int b = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumB, fGain) + fBias), a);
133            if (!convolveAlpha) {
134                a = SkGetPackedA32(PixelFetcher::fetch(src, x, y));
135                *dptr++ = SkPreMultiplyARGB(a, r, g, b);
136            } else {
137                *dptr++ = SkPackARGB32(a, r, g, b);
138            }
139        }
140    }
141}
142
143template<class PixelFetcher>
144void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
145    if (fConvolveAlpha) {
146        filterPixels<PixelFetcher, true>(src, result, rect);
147    } else {
148        filterPixels<PixelFetcher, false>(src, result, rect);
149    }
150}
151
152void SkMatrixConvolutionImageFilter::filterInteriorPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
153    filterPixels<UncheckedPixelFetcher>(src, result, rect);
154}
155
156void SkMatrixConvolutionImageFilter::filterBorderPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
157    switch (fTileMode) {
158        case kClamp_TileMode:
159            filterPixels<ClampPixelFetcher>(src, result, rect);
160            break;
161        case kRepeat_TileMode:
162            filterPixels<RepeatPixelFetcher>(src, result, rect);
163            break;
164        case kClampToBlack_TileMode:
165            filterPixels<ClampToBlackPixelFetcher>(src, result, rect);
166            break;
167    }
168}
169
170// FIXME:  This should be refactored to SkSingleInputImageFilter for
171// use by other filters.  For now, we assume the input is always
172// premultiplied and unpremultiply it
173static SkBitmap unpremultiplyBitmap(const SkBitmap& src)
174{
175    SkAutoLockPixels alp(src);
176    if (!src.getPixels()) {
177        return SkBitmap();
178    }
179    SkBitmap result;
180    result.setConfig(src.config(), src.width(), src.height());
181    result.allocPixels();
182    if (!result.getPixels()) {
183        return SkBitmap();
184    }
185    for (int y = 0; y < src.height(); ++y) {
186        const uint32_t* srcRow = src.getAddr32(0, y);
187        uint32_t* dstRow = result.getAddr32(0, y);
188        for (int x = 0; x < src.width(); ++x) {
189            dstRow[x] = SkUnPreMultiply::PMColorToColor(srcRow[x]);
190        }
191    }
192    return result;
193}
194
195bool SkMatrixConvolutionImageFilter::onFilterImage(Proxy* proxy,
196                                                   const SkBitmap& source,
197                                                   const SkMatrix& matrix,
198                                                   SkBitmap* result,
199                                                   SkIPoint* loc) {
200    SkBitmap src = this->getInputResult(proxy, source, matrix, loc);
201    if (src.config() != SkBitmap::kARGB_8888_Config) {
202        return false;
203    }
204
205    if (!fConvolveAlpha && !src.isOpaque()) {
206        src = unpremultiplyBitmap(src);
207    }
208
209    SkAutoLockPixels alp(src);
210    if (!src.getPixels()) {
211        return false;
212    }
213
214    result->setConfig(src.config(), src.width(), src.height());
215    result->allocPixels();
216
217    SkIRect interior = SkIRect::MakeXYWH(fTarget.fX, fTarget.fY,
218                                         src.width() - fKernelSize.fWidth + 1,
219                                         src.height() - fKernelSize.fHeight + 1);
220    SkIRect top = SkIRect::MakeWH(src.width(), fTarget.fY);
221    SkIRect bottom = SkIRect::MakeLTRB(0, interior.bottom(),
222                                       src.width(), src.height());
223    SkIRect left = SkIRect::MakeXYWH(0, interior.top(),
224                                     fTarget.fX, interior.height());
225    SkIRect right = SkIRect::MakeLTRB(interior.right(), interior.top(),
226                                      src.width(), interior.bottom());
227    filterBorderPixels(src, result, top);
228    filterBorderPixels(src, result, left);
229    filterInteriorPixels(src, result, interior);
230    filterBorderPixels(src, result, right);
231    filterBorderPixels(src, result, bottom);
232    return true;
233}
234
235#if SK_SUPPORT_GPU
236
237///////////////////////////////////////////////////////////////////////////////
238
239class GrGLMatrixConvolutionEffect;
240
241class GrMatrixConvolutionEffect : public GrSingleTextureEffect {
242public:
243    typedef SkMatrixConvolutionImageFilter::TileMode TileMode;
244    GrMatrixConvolutionEffect(GrTexture*,
245                              const SkISize& kernelSize,
246                              const SkScalar* kernel,
247                              SkScalar gain,
248                              SkScalar bias,
249                              const SkIPoint& target,
250                              TileMode tileMode,
251                              bool convolveAlpha);
252    virtual ~GrMatrixConvolutionEffect();
253
254    static const char* Name() { return "MatrixConvolution"; }
255    const SkISize& kernelSize() const { return fKernelSize; }
256    const float* target() const { return fTarget; }
257    const float* kernel() const { return fKernel; }
258    float gain() const { return fGain; }
259    float bias() const { return fBias; }
260    TileMode tileMode() const { return fTileMode; }
261    bool convolveAlpha() const { return fConvolveAlpha; }
262
263    typedef GrGLMatrixConvolutionEffect GLProgramStage;
264
265    virtual const GrProgramStageFactory& getFactory() const SK_OVERRIDE;
266    virtual bool isEqual(const GrCustomStage&) const SK_OVERRIDE;
267
268private:
269    SkISize  fKernelSize;
270    float   *fKernel;
271    float    fGain;
272    float    fBias;
273    float    fTarget[2];
274    TileMode fTileMode;
275    bool     fConvolveAlpha;
276
277    GR_DECLARE_CUSTOM_STAGE_TEST;
278
279    typedef GrSingleTextureEffect INHERITED;
280};
281
282class GrGLMatrixConvolutionEffect : public GrGLProgramStage {
283public:
284    GrGLMatrixConvolutionEffect(const GrProgramStageFactory& factory,
285                                const GrCustomStage& stage);
286    virtual void setupVariables(GrGLShaderBuilder* builder) SK_OVERRIDE;
287    virtual void emitVS(GrGLShaderBuilder* state,
288                        const char* vertexCoords) SK_OVERRIDE {}
289    virtual void emitFS(GrGLShaderBuilder* state,
290                        const char* outputColor,
291                        const char* inputColor,
292                        const TextureSamplerArray&) SK_OVERRIDE;
293
294    static inline StageKey GenKey(const GrCustomStage& s, const GrGLCaps& caps);
295
296    virtual void setData(const GrGLUniformManager&,
297                         const GrCustomStage&,
298                         const GrRenderTarget*,
299                         int stageNum) SK_OVERRIDE;
300
301private:
302    typedef GrGLUniformManager::UniformHandle        UniformHandle;
303    typedef SkMatrixConvolutionImageFilter::TileMode TileMode;
304    SkISize        fKernelSize;
305    TileMode       fTileMode;
306    bool           fConvolveAlpha;
307
308    UniformHandle  fKernelUni;
309    UniformHandle  fImageIncrementUni;
310    UniformHandle  fTargetUni;
311    UniformHandle  fGainUni;
312    UniformHandle  fBiasUni;
313};
314
315GrGLMatrixConvolutionEffect::GrGLMatrixConvolutionEffect(const GrProgramStageFactory& factory,
316                                           const GrCustomStage& stage)
317    : GrGLProgramStage(factory)
318    , fKernelUni(GrGLUniformManager::kInvalidUniformHandle)
319    , fImageIncrementUni(GrGLUniformManager::kInvalidUniformHandle)
320    , fTargetUni(GrGLUniformManager::kInvalidUniformHandle)
321    , fGainUni(GrGLUniformManager::kInvalidUniformHandle)
322    , fBiasUni(GrGLUniformManager::kInvalidUniformHandle) {
323    const GrMatrixConvolutionEffect& m = static_cast<const GrMatrixConvolutionEffect&>(stage);
324    fKernelSize = m.kernelSize();
325    fTileMode = m.tileMode();
326    fConvolveAlpha = m.convolveAlpha();
327}
328
329void GrGLMatrixConvolutionEffect::setupVariables(GrGLShaderBuilder* builder) {
330    fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
331                                             kVec2f_GrSLType, "ImageIncrement");
332    fKernelUni = builder->addUniformArray(GrGLShaderBuilder::kFragment_ShaderType,
333                                             kFloat_GrSLType, "Kernel", fKernelSize.width() * fKernelSize.height());
334    fTargetUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
335                                             kVec2f_GrSLType, "Target");
336    fGainUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
337                                   kFloat_GrSLType, "Gain");
338    fBiasUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
339                                   kFloat_GrSLType, "Bias");
340}
341
342static void appendTextureLookup(GrGLShaderBuilder* builder,
343                                const GrGLShaderBuilder::TextureSampler& sampler,
344                                const char* coord,
345                                SkMatrixConvolutionImageFilter::TileMode tileMode) {
346    SkString* code = &builder->fFSCode;
347    SkString clampedCoord;
348    switch (tileMode) {
349        case SkMatrixConvolutionImageFilter::kClamp_TileMode:
350            clampedCoord.printf("clamp(%s, 0.0, 1.0)", coord);
351            coord = clampedCoord.c_str();
352            break;
353        case SkMatrixConvolutionImageFilter::kRepeat_TileMode:
354            clampedCoord.printf("fract(%s)", coord);
355            coord = clampedCoord.c_str();
356            break;
357        case SkMatrixConvolutionImageFilter::kClampToBlack_TileMode:
358            code->appendf("clamp(%s, 0.0, 1.0) != %s ? vec4(0, 0, 0, 0) : ", coord, coord);
359            break;
360    }
361    builder->appendTextureLookup(code, sampler, coord);
362}
363
364void GrGLMatrixConvolutionEffect::emitFS(GrGLShaderBuilder* builder,
365                                  const char* outputColor,
366                                  const char* inputColor,
367                                  const TextureSamplerArray& samplers) {
368    SkString* code = &builder->fFSCode;
369
370    const char* target = builder->getUniformCStr(fTargetUni);
371    const char* imgInc = builder->getUniformCStr(fImageIncrementUni);
372    const char* kernel = builder->getUniformCStr(fKernelUni);
373    const char* gain = builder->getUniformCStr(fGainUni);
374    const char* bias = builder->getUniformCStr(fBiasUni);
375    int kWidth = fKernelSize.width();
376    int kHeight = fKernelSize.height();
377
378    code->appendf("\t\tvec4 sum = vec4(0, 0, 0, 0);\n");
379    code->appendf("\t\tvec2 coord = %s - %s * %s;\n",
380                  builder->defaultTexCoordsName(), target, imgInc);
381    code->appendf("\t\tfor (int y = 0; y < %d; y++) {\n", kHeight);
382    code->appendf("\t\t\tfor (int x = 0; x < %d; x++) {\n", kWidth);
383    code->appendf("\t\t\t\tfloat k = %s[y * %d + x];\n", kernel, kWidth);
384    code->appendf("\t\t\t\tvec2 coord2 = coord + vec2(x, y) * %s;\n", imgInc);
385    code->appendf("\t\t\t\tvec4 c = ");
386    appendTextureLookup(builder, samplers[0], "coord2", fTileMode);
387    code->appendf(";\n");
388    if (!fConvolveAlpha) {
389        code->appendf("\t\t\t\tc.rgb /= c.a;\n");
390    }
391    code->appendf("\t\t\t\tsum += c * k;\n");
392    code->appendf("\t\t\t}\n");
393    code->appendf("\t\t}\n");
394    if (fConvolveAlpha) {
395        code->appendf("\t\t%s = sum * %s + %s;\n", outputColor, gain, bias);
396        code->appendf("\t\t%s.rgb = clamp(%s.rgb, 0.0, %s.a);\n", outputColor, outputColor, outputColor);
397    } else {
398        code->appendf("\t\t%s.a = (", outputColor);
399        appendTextureLookup(builder, samplers[0], builder->defaultTexCoordsName(), fTileMode);
400        code->appendf(").a;\n");
401        code->appendf("\t\t%s.rgb = sum.rgb * %s + %s;\n", outputColor, gain, bias);
402        code->appendf("\t\t%s.rgb *= %s.a;\n", outputColor, outputColor);
403    }
404}
405
406namespace {
407
408int encodeXY(int x, int y) {
409    SkASSERT(x >= 1 && y >= 1 && x * y <= 32);
410    if (y < x)
411        return 0x40 | encodeXY(y, x);
412    else
413        return (0x40 >> x) | (y - x);
414}
415
416};
417
418GrGLProgramStage::StageKey GrGLMatrixConvolutionEffect::GenKey(const GrCustomStage& s,
419                                                        const GrGLCaps& caps) {
420    const GrMatrixConvolutionEffect& m = static_cast<const GrMatrixConvolutionEffect&>(s);
421    StageKey key = encodeXY(m.kernelSize().width(), m.kernelSize().height());
422    key |= m.tileMode() << 7;
423    key |= m.convolveAlpha() ? 1 << 9 : 0;
424    return key;
425}
426
427void GrGLMatrixConvolutionEffect::setData(const GrGLUniformManager& uman,
428                                   const GrCustomStage& data,
429                                   const GrRenderTarget*,
430                                   int stageNum) {
431    const GrMatrixConvolutionEffect& effect =
432        static_cast<const GrMatrixConvolutionEffect&>(data);
433    GrGLTexture& texture =
434        *static_cast<GrGLTexture*>(data.texture(0));
435    // the code we generated was for a specific kernel size
436    GrAssert(effect.kernelSize() == fKernelSize);
437    GrAssert(effect.tileMode() == fTileMode);
438    float imageIncrement[2];
439    imageIncrement[0] = 1.0f / texture.width();
440    imageIncrement[1] = 1.0f / texture.height();
441    uman.set2fv(fImageIncrementUni, 0, 1, imageIncrement);
442    uman.set2fv(fTargetUni, 0, 1, effect.target());
443    uman.set1fv(fKernelUni, 0, fKernelSize.width() * fKernelSize.height(), effect.kernel());
444    uman.set1f(fGainUni, effect.gain());
445    uman.set1f(fBiasUni, effect.bias());
446}
447
448GrMatrixConvolutionEffect::GrMatrixConvolutionEffect(GrTexture* texture,
449                                                     const SkISize& kernelSize,
450                                                     const SkScalar* kernel,
451                                                     SkScalar gain,
452                                                     SkScalar bias,
453                                                     const SkIPoint& target,
454                                                     TileMode tileMode,
455                                                     bool convolveAlpha)
456  : INHERITED(texture),
457    fKernelSize(kernelSize),
458    fGain(SkScalarToFloat(gain)),
459    fBias(SkScalarToFloat(bias) / 255.0f),
460    fTileMode(tileMode),
461    fConvolveAlpha(convolveAlpha) {
462    fKernel = new float[kernelSize.width() * kernelSize.height()];
463    for (int i = 0; i < kernelSize.width() * kernelSize.height(); i++) {
464        fKernel[i] = SkScalarToFloat(kernel[i]);
465    }
466    fTarget[0] = target.x();
467    fTarget[1] = target.y();
468}
469
470GrMatrixConvolutionEffect::~GrMatrixConvolutionEffect() {
471    delete[] fKernel;
472}
473
474const GrProgramStageFactory& GrMatrixConvolutionEffect::getFactory() const {
475    return GrTProgramStageFactory<GrMatrixConvolutionEffect>::getInstance();
476}
477
478bool GrMatrixConvolutionEffect::isEqual(const GrCustomStage& sBase) const {
479    const GrMatrixConvolutionEffect& s =
480        static_cast<const GrMatrixConvolutionEffect&>(sBase);
481    return INHERITED::isEqual(sBase) &&
482           fKernelSize == s.kernelSize() &&
483           !memcmp(fKernel, s.kernel(), fKernelSize.width() * fKernelSize.height() * sizeof(float)) &&
484           fGain == s.gain() &&
485           fBias == s.bias() &&
486           fTarget == s.target() &&
487           fTileMode == s.tileMode() &&
488           fConvolveAlpha == s.convolveAlpha();
489}
490
491GR_DEFINE_CUSTOM_STAGE_TEST(GrMatrixConvolutionEffect);
492
493// A little bit less than the minimum # uniforms required by DX9SM2 (32).
494// Allows for a 5x5 kernel (or 25x1, for that matter).
495#define MAX_KERNEL_SIZE 25
496
497GrCustomStage* GrMatrixConvolutionEffect::TestCreate(SkRandom* random,
498                                                     GrContext* context,
499                                                     GrTexture* textures[]) {
500    int texIdx = random->nextBool() ? GrCustomStageUnitTest::kSkiaPMTextureIdx :
501                                      GrCustomStageUnitTest::kAlphaTextureIdx;
502    int width = random->nextRangeU(1, MAX_KERNEL_SIZE);
503    int height = random->nextRangeU(1, MAX_KERNEL_SIZE / width);
504    SkISize kernelSize = SkISize::Make(width, height);
505    SkScalar* kernel = new SkScalar[width * height];
506    for (int i = 0; i < width * height; i++) {
507        kernel[i] = random->nextSScalar1();
508    }
509    SkScalar gain = random->nextSScalar1();
510    SkScalar bias = random->nextSScalar1();
511    SkIPoint target = SkIPoint::Make(random->nextRangeU(0, kernelSize.width()),
512                                     random->nextRangeU(0, kernelSize.height()));
513    TileMode tileMode = static_cast<TileMode>(random->nextRangeU(0, 2));
514    bool convolveAlpha = random->nextBool();
515    return SkNEW_ARGS(GrMatrixConvolutionEffect, (textures[texIdx],
516                                                  kernelSize,
517                                                  kernel,
518                                                  gain,
519                                                  bias,
520                                                  target,
521                                                  tileMode,
522                                                  convolveAlpha));
523
524}
525
526bool SkMatrixConvolutionImageFilter::asNewCustomStage(GrCustomStage** stage,
527                                                      GrTexture* texture) const {
528    bool ok = fKernelSize.width() * fKernelSize.height() <= MAX_KERNEL_SIZE;
529    if (ok && stage) {
530        *stage = SkNEW_ARGS(GrMatrixConvolutionEffect, (texture,
531                                                        fKernelSize,
532                                                        fKernel,
533                                                        fGain,
534                                                        fBias,
535                                                        fTarget,
536                                                        fTileMode,
537                                                        fConvolveAlpha));
538    }
539    return ok;
540}
541
542///////////////////////////////////////////////////////////////////////////////
543
544#endif
545