SkMatrixConvolutionImageFilter.cpp revision ba6e954140e45e251d67934ed6ad752149fcf72f 
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
25namespace {
26
27bool TileModeIsValid(SkMatrixConvolutionImageFilter::TileMode tileMode) {
28    switch (tileMode) {
29    case SkMatrixConvolutionImageFilter::kClamp_TileMode:
30    case SkMatrixConvolutionImageFilter::kRepeat_TileMode:
31    case SkMatrixConvolutionImageFilter::kClampToBlack_TileMode:
32        return true;
33    default:
34        break;
35    }
36    return false;
37}
38
39}
40
41SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(const SkISize& kernelSize, const SkScalar* kernel, SkScalar gain, SkScalar bias, const SkIPoint& target, TileMode tileMode, bool convolveAlpha, SkImageFilter* input)
42  : INHERITED(input),
43    fKernelSize(kernelSize),
44    fGain(gain),
45    fBias(bias),
46    fTarget(target),
47    fTileMode(tileMode),
48    fConvolveAlpha(convolveAlpha) {
49    uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight;
50    fKernel = SkNEW_ARRAY(SkScalar, size);
51    memcpy(fKernel, kernel, size * sizeof(SkScalar));
52    SkASSERT(kernelSize.fWidth >= 1 && kernelSize.fHeight >= 1);
53    SkASSERT(target.fX >= 0 && target.fX < kernelSize.fWidth);
54    SkASSERT(target.fY >= 0 && target.fY < kernelSize.fHeight);
55}
56
57SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
58    fKernelSize.fWidth = buffer.readInt();
59    fKernelSize.fHeight = buffer.readInt();
60    uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight;
61    fKernel = SkNEW_ARRAY(SkScalar, size);
62    SkDEBUGCODE(uint32_t readSize = )buffer.readScalarArray(fKernel);
63    SkASSERT(readSize == size);
64    fGain = buffer.readScalar();
65    fBias = buffer.readScalar();
66    fTarget.fX = buffer.readInt();
67    fTarget.fY = buffer.readInt();
68    fTileMode = (TileMode) buffer.readInt();
69    fConvolveAlpha = buffer.readBool();
70    buffer.validate(SkScalarIsFinite(fGain) &&
71                    SkScalarIsFinite(fBias) &&
72                    TileModeIsValid(fTileMode));
73}
74
75void SkMatrixConvolutionImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
76    this->INHERITED::flatten(buffer);
77    buffer.writeInt(fKernelSize.fWidth);
78    buffer.writeInt(fKernelSize.fHeight);
79    buffer.writeScalarArray(fKernel, fKernelSize.fWidth * fKernelSize.fHeight);
80    buffer.writeScalar(fGain);
81    buffer.writeScalar(fBias);
82    buffer.writeInt(fTarget.fX);
83    buffer.writeInt(fTarget.fY);
84    buffer.writeInt((int) fTileMode);
85    buffer.writeBool(fConvolveAlpha);
86}
87
88SkMatrixConvolutionImageFilter::~SkMatrixConvolutionImageFilter() {
89    delete[] fKernel;
90}
91
92class UncheckedPixelFetcher {
93public:
94    static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
95        return *src.getAddr32(x, y);
96    }
97};
98
99class ClampPixelFetcher {
100public:
101    static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
102        x = SkClampMax(x, src.width() - 1);
103        y = SkClampMax(y, src.height() - 1);
104        return *src.getAddr32(x, y);
105    }
106};
107
108class RepeatPixelFetcher {
109public:
110    static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
111        x %= src.width();
112        y %= src.height();
113        if (x < 0) {
114            x += src.width();
115        }
116        if (y < 0) {
117            y += src.height();
118        }
119        return *src.getAddr32(x, y);
120    }
121};
122
123class ClampToBlackPixelFetcher {
124public:
125    static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
126        if (x < 0 || x >= src.width() || y < 0 || y >= src.height()) {
127            return 0;
128        } else {
129            return *src.getAddr32(x, y);
130        }
131    }
132};
133
134template<class PixelFetcher, bool convolveAlpha>
135void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
136    for (int y = rect.fTop; y < rect.fBottom; ++y) {
137        SkPMColor* dptr = result->getAddr32(rect.fLeft, y);
138        for (int x = rect.fLeft; x < rect.fRight; ++x) {
139            SkScalar sumA = 0, sumR = 0, sumG = 0, sumB = 0;
140            for (int cy = 0; cy < fKernelSize.fHeight; cy++) {
141                for (int cx = 0; cx < fKernelSize.fWidth; cx++) {
142                    SkPMColor s = PixelFetcher::fetch(src, x + cx - fTarget.fX, y + cy - fTarget.fY);
143                    SkScalar k = fKernel[cy * fKernelSize.fWidth + cx];
144                    if (convolveAlpha) {
145                        sumA += SkScalarMul(SkIntToScalar(SkGetPackedA32(s)), k);
146                    }
147                    sumR += SkScalarMul(SkIntToScalar(SkGetPackedR32(s)), k);
148                    sumG += SkScalarMul(SkIntToScalar(SkGetPackedG32(s)), k);
149                    sumB += SkScalarMul(SkIntToScalar(SkGetPackedB32(s)), k);
150                }
151            }
152            int a = convolveAlpha
153                  ? SkClampMax(SkScalarFloorToInt(SkScalarMul(sumA, fGain) + fBias), 255)
154                  : 255;
155            int r = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumR, fGain) + fBias), a);
156            int g = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumG, fGain) + fBias), a);
157            int b = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumB, fGain) + fBias), a);
158            if (!convolveAlpha) {
159                a = SkGetPackedA32(PixelFetcher::fetch(src, x, y));
160                *dptr++ = SkPreMultiplyARGB(a, r, g, b);
161            } else {
162                *dptr++ = SkPackARGB32(a, r, g, b);
163            }
164        }
165    }
166}
167
168template<class PixelFetcher>
169void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
170    if (fConvolveAlpha) {
171        filterPixels<PixelFetcher, true>(src, result, rect);
172    } else {
173        filterPixels<PixelFetcher, false>(src, result, rect);
174    }
175}
176
177void SkMatrixConvolutionImageFilter::filterInteriorPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
178    filterPixels<UncheckedPixelFetcher>(src, result, rect);
179}
180
181void SkMatrixConvolutionImageFilter::filterBorderPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
182    switch (fTileMode) {
183        case kClamp_TileMode:
184            filterPixels<ClampPixelFetcher>(src, result, rect);
185            break;
186        case kRepeat_TileMode:
187            filterPixels<RepeatPixelFetcher>(src, result, rect);
188            break;
189        case kClampToBlack_TileMode:
190            filterPixels<ClampToBlackPixelFetcher>(src, result, rect);
191            break;
192    }
193}
194
195// FIXME:  This should be refactored to SkImageFilterUtils for
196// use by other filters.  For now, we assume the input is always
197// premultiplied and unpremultiply it
198static SkBitmap unpremultiplyBitmap(const SkBitmap& src)
199{
200    SkAutoLockPixels alp(src);
201    if (!src.getPixels()) {
202        return SkBitmap();
203    }
204    SkBitmap result;
205    result.setConfig(src.config(), src.width(), src.height());
206    result.allocPixels();
207    if (!result.getPixels()) {
208        return SkBitmap();
209    }
210    for (int y = 0; y < src.height(); ++y) {
211        const uint32_t* srcRow = src.getAddr32(0, y);
212        uint32_t* dstRow = result.getAddr32(0, y);
213        for (int x = 0; x < src.width(); ++x) {
214            dstRow[x] = SkUnPreMultiply::PMColorToColor(srcRow[x]);
215        }
216    }
217    return result;
218}
219
220bool SkMatrixConvolutionImageFilter::onFilterImage(Proxy* proxy,
221                                                   const SkBitmap& source,
222                                                   const SkMatrix& matrix,
223                                                   SkBitmap* result,
224                                                   SkIPoint* loc) {
225    SkBitmap src = source;
226    if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, loc)) {
227        return false;
228    }
229
230    if (src.config() != SkBitmap::kARGB_8888_Config) {
231        return false;
232    }
233
234    if (!fConvolveAlpha && !src.isOpaque()) {
235        src = unpremultiplyBitmap(src);
236    }
237
238    SkAutoLockPixels alp(src);
239    if (!src.getPixels()) {
240        return false;
241    }
242
243    result->setConfig(src.config(), src.width(), src.height());
244    result->allocPixels();
245
246    SkIRect interior = SkIRect::MakeXYWH(fTarget.fX, fTarget.fY,
247                                         src.width() - fKernelSize.fWidth + 1,
248                                         src.height() - fKernelSize.fHeight + 1);
249    SkIRect top = SkIRect::MakeWH(src.width(), fTarget.fY);
250    SkIRect bottom = SkIRect::MakeLTRB(0, interior.bottom(),
251                                       src.width(), src.height());
252    SkIRect left = SkIRect::MakeXYWH(0, interior.top(),
253                                     fTarget.fX, interior.height());
254    SkIRect right = SkIRect::MakeLTRB(interior.right(), interior.top(),
255                                      src.width(), interior.bottom());
256    filterBorderPixels(src, result, top);
257    filterBorderPixels(src, result, left);
258    filterInteriorPixels(src, result, interior);
259    filterBorderPixels(src, result, right);
260    filterBorderPixels(src, result, bottom);
261    return true;
262}
263
264#if SK_SUPPORT_GPU
265
266///////////////////////////////////////////////////////////////////////////////
267
268class GrGLMatrixConvolutionEffect;
269
270class GrMatrixConvolutionEffect : public GrSingleTextureEffect {
271public:
272    typedef SkMatrixConvolutionImageFilter::TileMode TileMode;
273    static GrEffectRef* Create(GrTexture* texture,
274                               const SkISize& kernelSize,
275                               const SkScalar* kernel,
276                               SkScalar gain,
277                               SkScalar bias,
278                               const SkIPoint& target,
279                               TileMode tileMode,
280                               bool convolveAlpha) {
281        AutoEffectUnref effect(SkNEW_ARGS(GrMatrixConvolutionEffect, (texture,
282                                                                      kernelSize,
283                                                                      kernel,
284                                                                      gain,
285                                                                      bias,
286                                                                      target,
287                                                                      tileMode,
288                                                                      convolveAlpha)));
289        return CreateEffectRef(effect);
290    }
291    virtual ~GrMatrixConvolutionEffect();
292
293    virtual void getConstantColorComponents(GrColor* color,
294                                            uint32_t* validFlags) const SK_OVERRIDE {
295        // TODO: Try to do better?
296        *validFlags = 0;
297    }
298
299    static const char* Name() { return "MatrixConvolution"; }
300    const SkISize& kernelSize() const { return fKernelSize; }
301    const float* target() const { return fTarget; }
302    const float* kernel() const { return fKernel; }
303    float gain() const { return fGain; }
304    float bias() const { return fBias; }
305    TileMode tileMode() const { return fTileMode; }
306    bool convolveAlpha() const { return fConvolveAlpha; }
307
308    typedef GrGLMatrixConvolutionEffect GLEffect;
309
310    virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
311
312private:
313    GrMatrixConvolutionEffect(GrTexture*,
314                              const SkISize& kernelSize,
315                              const SkScalar* kernel,
316                              SkScalar gain,
317                              SkScalar bias,
318                              const SkIPoint& target,
319                              TileMode tileMode,
320                              bool convolveAlpha);
321
322    virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
323
324    SkISize  fKernelSize;
325    float   *fKernel;
326    float    fGain;
327    float    fBias;
328    float    fTarget[2];
329    TileMode fTileMode;
330    bool     fConvolveAlpha;
331
332    GR_DECLARE_EFFECT_TEST;
333
334    typedef GrSingleTextureEffect INHERITED;
335};
336
337class GrGLMatrixConvolutionEffect : public GrGLEffect {
338public:
339    GrGLMatrixConvolutionEffect(const GrBackendEffectFactory& factory,
340                                const GrDrawEffect& effect);
341    virtual void emitCode(GrGLShaderBuilder*,
342                          const GrDrawEffect&,
343                          EffectKey,
344                          const char* outputColor,
345                          const char* inputColor,
346                          const TextureSamplerArray&) SK_OVERRIDE;
347
348    static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&);
349
350    virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE;
351
352private:
353    typedef GrGLUniformManager::UniformHandle        UniformHandle;
354    typedef SkMatrixConvolutionImageFilter::TileMode TileMode;
355    SkISize             fKernelSize;
356    TileMode            fTileMode;
357    bool                fConvolveAlpha;
358
359    UniformHandle       fKernelUni;
360    UniformHandle       fImageIncrementUni;
361    UniformHandle       fTargetUni;
362    UniformHandle       fGainUni;
363    UniformHandle       fBiasUni;
364
365    GrGLEffectMatrix    fEffectMatrix;
366
367    typedef GrGLEffect INHERITED;
368};
369
370GrGLMatrixConvolutionEffect::GrGLMatrixConvolutionEffect(const GrBackendEffectFactory& factory,
371                                                         const GrDrawEffect& drawEffect)
372    : INHERITED(factory)
373    , fEffectMatrix(drawEffect.castEffect<GrMatrixConvolutionEffect>().coordsType()) {
374    const GrMatrixConvolutionEffect& m = drawEffect.castEffect<GrMatrixConvolutionEffect>();
375    fKernelSize = m.kernelSize();
376    fTileMode = m.tileMode();
377    fConvolveAlpha = m.convolveAlpha();
378}
379
380static void appendTextureLookup(GrGLShaderBuilder* builder,
381                                const GrGLShaderBuilder::TextureSampler& sampler,
382                                const char* coord,
383                                SkMatrixConvolutionImageFilter::TileMode tileMode) {
384    SkString clampedCoord;
385    switch (tileMode) {
386        case SkMatrixConvolutionImageFilter::kClamp_TileMode:
387            clampedCoord.printf("clamp(%s, 0.0, 1.0)", coord);
388            coord = clampedCoord.c_str();
389            break;
390        case SkMatrixConvolutionImageFilter::kRepeat_TileMode:
391            clampedCoord.printf("fract(%s)", coord);
392            coord = clampedCoord.c_str();
393            break;
394        case SkMatrixConvolutionImageFilter::kClampToBlack_TileMode:
395            builder->fsCodeAppendf("clamp(%s, 0.0, 1.0) != %s ? vec4(0, 0, 0, 0) : ", coord, coord);
396            break;
397    }
398    builder->fsAppendTextureLookup(sampler, coord);
399}
400
401void GrGLMatrixConvolutionEffect::emitCode(GrGLShaderBuilder* builder,
402                                           const GrDrawEffect&,
403                                           EffectKey key,
404                                           const char* outputColor,
405                                           const char* inputColor,
406                                           const TextureSamplerArray& samplers) {
407    SkString coords;
408    fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, &coords);
409    fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
410                                             kVec2f_GrSLType, "ImageIncrement");
411    fKernelUni = builder->addUniformArray(GrGLShaderBuilder::kFragment_Visibility,
412                                             kFloat_GrSLType, "Kernel", fKernelSize.width() * fKernelSize.height());
413    fTargetUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
414                                             kVec2f_GrSLType, "Target");
415    fGainUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
416                                   kFloat_GrSLType, "Gain");
417    fBiasUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
418                                   kFloat_GrSLType, "Bias");
419
420    const char* target = builder->getUniformCStr(fTargetUni);
421    const char* imgInc = builder->getUniformCStr(fImageIncrementUni);
422    const char* kernel = builder->getUniformCStr(fKernelUni);
423    const char* gain = builder->getUniformCStr(fGainUni);
424    const char* bias = builder->getUniformCStr(fBiasUni);
425    int kWidth = fKernelSize.width();
426    int kHeight = fKernelSize.height();
427
428    builder->fsCodeAppend("\t\tvec4 sum = vec4(0, 0, 0, 0);\n");
429    builder->fsCodeAppendf("\t\tvec2 coord = %s - %s * %s;\n", coords.c_str(), target, imgInc);
430    builder->fsCodeAppendf("\t\tfor (int y = 0; y < %d; y++) {\n", kHeight);
431    builder->fsCodeAppendf("\t\t\tfor (int x = 0; x < %d; x++) {\n", kWidth);
432    builder->fsCodeAppendf("\t\t\t\tfloat k = %s[y * %d + x];\n", kernel, kWidth);
433    builder->fsCodeAppendf("\t\t\t\tvec2 coord2 = coord + vec2(x, y) * %s;\n", imgInc);
434    builder->fsCodeAppend("\t\t\t\tvec4 c = ");
435    appendTextureLookup(builder, samplers[0], "coord2", fTileMode);
436    builder->fsCodeAppend(";\n");
437    if (!fConvolveAlpha) {
438        builder->fsCodeAppend("\t\t\t\tc.rgb /= c.a;\n");
439    }
440    builder->fsCodeAppend("\t\t\t\tsum += c * k;\n");
441    builder->fsCodeAppend("\t\t\t}\n");
442    builder->fsCodeAppend("\t\t}\n");
443    if (fConvolveAlpha) {
444        builder->fsCodeAppendf("\t\t%s = sum * %s + %s;\n", outputColor, gain, bias);
445        builder->fsCodeAppendf("\t\t%s.rgb = clamp(%s.rgb, 0.0, %s.a);\n", outputColor, outputColor, outputColor);
446    } else {
447        builder->fsCodeAppend("\t\tvec4 c = ");
448        appendTextureLookup(builder, samplers[0], coords.c_str(), fTileMode);
449        builder->fsCodeAppend(";\n");
450        builder->fsCodeAppendf("\t\t%s.a = c.a;\n", outputColor);
451        builder->fsCodeAppendf("\t\t%s.rgb = sum.rgb * %s + %s;\n", outputColor, gain, bias);
452        builder->fsCodeAppendf("\t\t%s.rgb *= %s.a;\n", outputColor, outputColor);
453    }
454}
455
456namespace {
457
458int encodeXY(int x, int y) {
459    SkASSERT(x >= 1 && y >= 1 && x * y <= 32);
460    if (y < x)
461        return 0x40 | encodeXY(y, x);
462    else
463        return (0x40 >> x) | (y - x);
464}
465
466};
467
468GrGLEffect::EffectKey GrGLMatrixConvolutionEffect::GenKey(const GrDrawEffect& drawEffect,
469                                                          const GrGLCaps&) {
470    const GrMatrixConvolutionEffect& m = drawEffect.castEffect<GrMatrixConvolutionEffect>();
471    EffectKey key = encodeXY(m.kernelSize().width(), m.kernelSize().height());
472    key |= m.tileMode() << 7;
473    key |= m.convolveAlpha() ? 1 << 9 : 0;
474    key <<= GrGLEffectMatrix::kKeyBits;
475    EffectKey matrixKey = GrGLEffectMatrix::GenKey(m.getMatrix(),
476                                                   drawEffect,
477                                                   m.coordsType(),
478                                                   m.texture(0));
479    return key | matrixKey;
480}
481
482void GrGLMatrixConvolutionEffect::setData(const GrGLUniformManager& uman,
483                                          const GrDrawEffect& drawEffect) {
484    const GrMatrixConvolutionEffect& conv = drawEffect.castEffect<GrMatrixConvolutionEffect>();
485    GrTexture& texture = *conv.texture(0);
486    // the code we generated was for a specific kernel size
487    SkASSERT(conv.kernelSize() == fKernelSize);
488    SkASSERT(conv.tileMode() == fTileMode);
489    float imageIncrement[2];
490    float ySign = texture.origin() == kTopLeft_GrSurfaceOrigin ? 1.0f : -1.0f;
491    imageIncrement[0] = 1.0f / texture.width();
492    imageIncrement[1] = ySign / texture.height();
493    uman.set2fv(fImageIncrementUni, 0, 1, imageIncrement);
494    uman.set2fv(fTargetUni, 0, 1, conv.target());
495    uman.set1fv(fKernelUni, 0, fKernelSize.width() * fKernelSize.height(), conv.kernel());
496    uman.set1f(fGainUni, conv.gain());
497    uman.set1f(fBiasUni, conv.bias());
498    fEffectMatrix.setData(uman,
499                          conv.getMatrix(),
500                          drawEffect,
501                          conv.texture(0));
502}
503
504GrMatrixConvolutionEffect::GrMatrixConvolutionEffect(GrTexture* texture,
505                                                     const SkISize& kernelSize,
506                                                     const SkScalar* kernel,
507                                                     SkScalar gain,
508                                                     SkScalar bias,
509                                                     const SkIPoint& target,
510                                                     TileMode tileMode,
511                                                     bool convolveAlpha)
512  : INHERITED(texture, MakeDivByTextureWHMatrix(texture)),
513    fKernelSize(kernelSize),
514    fGain(SkScalarToFloat(gain)),
515    fBias(SkScalarToFloat(bias) / 255.0f),
516    fTileMode(tileMode),
517    fConvolveAlpha(convolveAlpha) {
518    fKernel = new float[kernelSize.width() * kernelSize.height()];
519    for (int i = 0; i < kernelSize.width() * kernelSize.height(); i++) {
520        fKernel[i] = SkScalarToFloat(kernel[i]);
521    }
522    fTarget[0] = static_cast<float>(target.x());
523    fTarget[1] = static_cast<float>(target.y());
524}
525
526GrMatrixConvolutionEffect::~GrMatrixConvolutionEffect() {
527    delete[] fKernel;
528}
529
530const GrBackendEffectFactory& GrMatrixConvolutionEffect::getFactory() const {
531    return GrTBackendEffectFactory<GrMatrixConvolutionEffect>::getInstance();
532}
533
534bool GrMatrixConvolutionEffect::onIsEqual(const GrEffect& sBase) const {
535    const GrMatrixConvolutionEffect& s = CastEffect<GrMatrixConvolutionEffect>(sBase);
536    return this->texture(0) == s.texture(0) &&
537           fKernelSize == s.kernelSize() &&
538           !memcmp(fKernel, s.kernel(), fKernelSize.width() * fKernelSize.height() * sizeof(float)) &&
539           fGain == s.gain() &&
540           fBias == s.bias() &&
541           fTarget == s.target() &&
542           fTileMode == s.tileMode() &&
543           fConvolveAlpha == s.convolveAlpha();
544}
545
546GR_DEFINE_EFFECT_TEST(GrMatrixConvolutionEffect);
547
548// A little bit less than the minimum # uniforms required by DX9SM2 (32).
549// Allows for a 5x5 kernel (or 25x1, for that matter).
550#define MAX_KERNEL_SIZE 25
551
552GrEffectRef* GrMatrixConvolutionEffect::TestCreate(SkRandom* random,
553                                                   GrContext* context,
554                                                   const GrDrawTargetCaps&,
555                                                   GrTexture* textures[]) {
556    int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx :
557                                      GrEffectUnitTest::kAlphaTextureIdx;
558    int width = random->nextRangeU(1, MAX_KERNEL_SIZE);
559    int height = random->nextRangeU(1, MAX_KERNEL_SIZE / width);
560    SkISize kernelSize = SkISize::Make(width, height);
561    SkAutoTDeleteArray<SkScalar> kernel(new SkScalar[width * height]);
562    for (int i = 0; i < width * height; i++) {
563        kernel.get()[i] = random->nextSScalar1();
564    }
565    SkScalar gain = random->nextSScalar1();
566    SkScalar bias = random->nextSScalar1();
567    SkIPoint target = SkIPoint::Make(random->nextRangeU(0, kernelSize.width()),
568                                     random->nextRangeU(0, kernelSize.height()));
569    TileMode tileMode = static_cast<TileMode>(random->nextRangeU(0, 2));
570    bool convolveAlpha = random->nextBool();
571    return GrMatrixConvolutionEffect::Create(textures[texIdx],
572                                             kernelSize,
573                                             kernel.get(),
574                                             gain,
575                                             bias,
576                                             target,
577                                             tileMode,
578                                             convolveAlpha);
579}
580
581bool SkMatrixConvolutionImageFilter::asNewEffect(GrEffectRef** effect,
582                                                 GrTexture* texture,
583                                                 const SkMatrix&) const {
584    if (!effect) {
585        return fKernelSize.width() * fKernelSize.height() <= MAX_KERNEL_SIZE;
586    }
587    SkASSERT(fKernelSize.width() * fKernelSize.height() <= MAX_KERNEL_SIZE);
588    *effect = GrMatrixConvolutionEffect::Create(texture,
589                                                fKernelSize,
590                                                fKernel,
591                                                fGain,
592                                                fBias,
593                                                fTarget,
594                                                fTileMode,
595                                                fConvolveAlpha);
596    return true;
597}
598
599///////////////////////////////////////////////////////////////////////////////
600
601#endif
602