SkMatrixConvolutionImageFilter.cpp revision 9195743aac79a4fa82059ab614b9795f215475f7 
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 "SkReadBuffer.h"
12#include "SkWriteBuffer.h"
13#include "SkRect.h"
14#include "SkUnPreMultiply.h"
15
16#if SK_SUPPORT_GPU
17#include "gl/GrGLEffect.h"
18#include "effects/GrSingleTextureEffect.h"
19#include "GrTBackendEffectFactory.h"
20#include "GrTexture.h"
21#include "SkMatrix.h"
22#endif
23
24static bool tile_mode_is_valid(SkMatrixConvolutionImageFilter::TileMode tileMode) {
25    switch (tileMode) {
26    case SkMatrixConvolutionImageFilter::kClamp_TileMode:
27    case SkMatrixConvolutionImageFilter::kRepeat_TileMode:
28    case SkMatrixConvolutionImageFilter::kClampToBlack_TileMode:
29        return true;
30    default:
31        break;
32    }
33    return false;
34}
35
36SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(
37    const SkISize& kernelSize,
38    const SkScalar* kernel,
39    SkScalar gain,
40    SkScalar bias,
41    const SkIPoint& kernelOffset,
42    TileMode tileMode,
43    bool convolveAlpha,
44    SkImageFilter* input,
45    const CropRect* cropRect)
46  : INHERITED(input, cropRect),
47    fKernelSize(kernelSize),
48    fGain(gain),
49    fBias(bias),
50    fKernelOffset(kernelOffset),
51    fTileMode(tileMode),
52    fConvolveAlpha(convolveAlpha) {
53    uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight;
54    fKernel = SkNEW_ARRAY(SkScalar, size);
55    memcpy(fKernel, kernel, size * sizeof(SkScalar));
56    SkASSERT(kernelSize.fWidth >= 1 && kernelSize.fHeight >= 1);
57    SkASSERT(kernelOffset.fX >= 0 && kernelOffset.fX < kernelSize.fWidth);
58    SkASSERT(kernelOffset.fY >= 0 && kernelOffset.fY < kernelSize.fHeight);
59}
60
61SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(SkReadBuffer& buffer)
62    : INHERITED(1, buffer) {
63    // We need to be able to read at most SK_MaxS32 bytes, so divide that
64    // by the size of a scalar to know how many scalars we can read.
65    static const int32_t kMaxSize = SK_MaxS32 / sizeof(SkScalar);
66    fKernelSize.fWidth = buffer.readInt();
67    fKernelSize.fHeight = buffer.readInt();
68    if ((fKernelSize.fWidth >= 1) && (fKernelSize.fHeight >= 1) &&
69        // Make sure size won't be larger than a signed int,
70        // which would still be extremely large for a kernel,
71        // but we don't impose a hard limit for kernel size
72        (kMaxSize / fKernelSize.fWidth >= fKernelSize.fHeight)) {
73        size_t size = fKernelSize.fWidth * fKernelSize.fHeight;
74        fKernel = SkNEW_ARRAY(SkScalar, size);
75        SkDEBUGCODE(bool success =) buffer.readScalarArray(fKernel, size);
76        SkASSERT(success);
77    } else {
78        fKernel = 0;
79    }
80    fGain = buffer.readScalar();
81    fBias = buffer.readScalar();
82    fKernelOffset.fX = buffer.readInt();
83    fKernelOffset.fY = buffer.readInt();
84    fTileMode = (TileMode) buffer.readInt();
85    fConvolveAlpha = buffer.readBool();
86    buffer.validate((fKernel != 0) &&
87                    SkScalarIsFinite(fGain) &&
88                    SkScalarIsFinite(fBias) &&
89                    tile_mode_is_valid(fTileMode));
90}
91
92void SkMatrixConvolutionImageFilter::flatten(SkWriteBuffer& buffer) const {
93    this->INHERITED::flatten(buffer);
94    buffer.writeInt(fKernelSize.fWidth);
95    buffer.writeInt(fKernelSize.fHeight);
96    buffer.writeScalarArray(fKernel, fKernelSize.fWidth * fKernelSize.fHeight);
97    buffer.writeScalar(fGain);
98    buffer.writeScalar(fBias);
99    buffer.writeInt(fKernelOffset.fX);
100    buffer.writeInt(fKernelOffset.fY);
101    buffer.writeInt((int) fTileMode);
102    buffer.writeBool(fConvolveAlpha);
103}
104
105SkMatrixConvolutionImageFilter::~SkMatrixConvolutionImageFilter() {
106    delete[] fKernel;
107}
108
109class UncheckedPixelFetcher {
110public:
111    static inline SkPMColor fetch(const SkBitmap& src, int x, int y, const SkIRect& bounds) {
112        return *src.getAddr32(x, y);
113    }
114};
115
116class ClampPixelFetcher {
117public:
118    static inline SkPMColor fetch(const SkBitmap& src, int x, int y, const SkIRect& bounds) {
119        x = SkPin32(x, bounds.fLeft, bounds.fRight - 1);
120        y = SkPin32(y, bounds.fTop, bounds.fBottom - 1);
121        return *src.getAddr32(x, y);
122    }
123};
124
125class RepeatPixelFetcher {
126public:
127    static inline SkPMColor fetch(const SkBitmap& src, int x, int y, const SkIRect& bounds) {
128        x = (x - bounds.left()) % bounds.width() + bounds.left();
129        y = (y - bounds.top()) % bounds.height() + bounds.top();
130        if (x < bounds.left()) {
131            x += bounds.width();
132        }
133        if (y < bounds.top()) {
134            y += bounds.height();
135        }
136        return *src.getAddr32(x, y);
137    }
138};
139
140class ClampToBlackPixelFetcher {
141public:
142    static inline SkPMColor fetch(const SkBitmap& src, int x, int y, const SkIRect& bounds) {
143        if (x < bounds.fLeft || x >= bounds.fRight || y < bounds.fTop || y >= bounds.fBottom) {
144            return 0;
145        } else {
146            return *src.getAddr32(x, y);
147        }
148    }
149};
150
151template<class PixelFetcher, bool convolveAlpha>
152void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src,
153                                                  SkBitmap* result,
154                                                  const SkIRect& rect,
155                                                  const SkIRect& bounds) const {
156    if (rect.isEmpty()) {
157        return;
158    }
159    for (int y = rect.fTop; y < rect.fBottom; ++y) {
160        SkPMColor* dptr = result->getAddr32(rect.fLeft - bounds.fLeft, y - bounds.fTop);
161        for (int x = rect.fLeft; x < rect.fRight; ++x) {
162            SkScalar sumA = 0, sumR = 0, sumG = 0, sumB = 0;
163            for (int cy = 0; cy < fKernelSize.fHeight; cy++) {
164                for (int cx = 0; cx < fKernelSize.fWidth; cx++) {
165                    SkPMColor s = PixelFetcher::fetch(src,
166                                                      x + cx - fKernelOffset.fX,
167                                                      y + cy - fKernelOffset.fY,
168                                                      bounds);
169                    SkScalar k = fKernel[cy * fKernelSize.fWidth + cx];
170                    if (convolveAlpha) {
171                        sumA += SkScalarMul(SkIntToScalar(SkGetPackedA32(s)), k);
172                    }
173                    sumR += SkScalarMul(SkIntToScalar(SkGetPackedR32(s)), k);
174                    sumG += SkScalarMul(SkIntToScalar(SkGetPackedG32(s)), k);
175                    sumB += SkScalarMul(SkIntToScalar(SkGetPackedB32(s)), k);
176                }
177            }
178            int a = convolveAlpha
179                  ? SkClampMax(SkScalarFloorToInt(SkScalarMul(sumA, fGain) + fBias), 255)
180                  : 255;
181            int r = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumR, fGain) + fBias), a);
182            int g = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumG, fGain) + fBias), a);
183            int b = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumB, fGain) + fBias), a);
184            if (!convolveAlpha) {
185                a = SkGetPackedA32(PixelFetcher::fetch(src, x, y, bounds));
186                *dptr++ = SkPreMultiplyARGB(a, r, g, b);
187            } else {
188                *dptr++ = SkPackARGB32(a, r, g, b);
189            }
190        }
191    }
192}
193
194template<class PixelFetcher>
195void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src,
196                                                  SkBitmap* result,
197                                                  const SkIRect& rect,
198                                                  const SkIRect& bounds) const {
199    if (fConvolveAlpha) {
200        filterPixels<PixelFetcher, true>(src, result, rect, bounds);
201    } else {
202        filterPixels<PixelFetcher, false>(src, result, rect, bounds);
203    }
204}
205
206void SkMatrixConvolutionImageFilter::filterInteriorPixels(const SkBitmap& src,
207                                                          SkBitmap* result,
208                                                          const SkIRect& rect,
209                                                          const SkIRect& bounds) const {
210    filterPixels<UncheckedPixelFetcher>(src, result, rect, bounds);
211}
212
213void SkMatrixConvolutionImageFilter::filterBorderPixels(const SkBitmap& src,
214                                                        SkBitmap* result,
215                                                        const SkIRect& rect,
216                                                        const SkIRect& bounds) const {
217    switch (fTileMode) {
218        case kClamp_TileMode:
219            filterPixels<ClampPixelFetcher>(src, result, rect, bounds);
220            break;
221        case kRepeat_TileMode:
222            filterPixels<RepeatPixelFetcher>(src, result, rect, bounds);
223            break;
224        case kClampToBlack_TileMode:
225            filterPixels<ClampToBlackPixelFetcher>(src, result, rect, bounds);
226            break;
227    }
228}
229
230// FIXME:  This should be refactored to SkImageFilterUtils for
231// use by other filters.  For now, we assume the input is always
232// premultiplied and unpremultiply it
233static SkBitmap unpremultiplyBitmap(const SkBitmap& src)
234{
235    SkAutoLockPixels alp(src);
236    if (!src.getPixels()) {
237        return SkBitmap();
238    }
239    SkBitmap result;
240    result.setConfig(src.config(), src.width(), src.height());
241    result.allocPixels();
242    if (!result.getPixels()) {
243        return SkBitmap();
244    }
245    for (int y = 0; y < src.height(); ++y) {
246        const uint32_t* srcRow = src.getAddr32(0, y);
247        uint32_t* dstRow = result.getAddr32(0, y);
248        for (int x = 0; x < src.width(); ++x) {
249            dstRow[x] = SkUnPreMultiply::PMColorToColor(srcRow[x]);
250        }
251    }
252    return result;
253}
254
255bool SkMatrixConvolutionImageFilter::onFilterImage(Proxy* proxy,
256                                                   const SkBitmap& source,
257                                                   const Context& ctx,
258                                                   SkBitmap* result,
259                                                   SkIPoint* offset) const {
260    SkBitmap src = source;
261    SkIPoint srcOffset = SkIPoint::Make(0, 0);
262    if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctx, &src, &srcOffset)) {
263        return false;
264    }
265
266    if (src.colorType() != kN32_SkColorType) {
267        return false;
268    }
269
270    SkIRect bounds;
271    if (!this->applyCropRect(ctx, proxy, src, &srcOffset, &bounds, &src)) {
272        return false;
273    }
274
275    if (!fConvolveAlpha && !src.isOpaque()) {
276        src = unpremultiplyBitmap(src);
277    }
278
279    SkAutoLockPixels alp(src);
280    if (!src.getPixels()) {
281        return false;
282    }
283
284    result->setConfig(src.config(), bounds.width(), bounds.height());
285    result->allocPixels();
286    if (!result->getPixels()) {
287        return false;
288    }
289
290    offset->fX = bounds.fLeft;
291    offset->fY = bounds.fTop;
292    bounds.offset(-srcOffset);
293    SkIRect interior = SkIRect::MakeXYWH(bounds.left() + fKernelOffset.fX,
294                                         bounds.top() + fKernelOffset.fY,
295                                         bounds.width() - fKernelSize.fWidth + 1,
296                                         bounds.height() - fKernelSize.fHeight + 1);
297    SkIRect top = SkIRect::MakeLTRB(bounds.left(), bounds.top(), bounds.right(), interior.top());
298    SkIRect bottom = SkIRect::MakeLTRB(bounds.left(), interior.bottom(),
299                                       bounds.right(), bounds.bottom());
300    SkIRect left = SkIRect::MakeLTRB(bounds.left(), interior.top(),
301                                     interior.left(), interior.bottom());
302    SkIRect right = SkIRect::MakeLTRB(interior.right(), interior.top(),
303                                      bounds.right(), interior.bottom());
304    filterBorderPixels(src, result, top, bounds);
305    filterBorderPixels(src, result, left, bounds);
306    filterInteriorPixels(src, result, interior, bounds);
307    filterBorderPixels(src, result, right, bounds);
308    filterBorderPixels(src, result, bottom, bounds);
309    return true;
310}
311
312bool SkMatrixConvolutionImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
313                                                    SkIRect* dst) const {
314    SkIRect bounds = src;
315    bounds.fRight += fKernelSize.width() - 1;
316    bounds.fBottom += fKernelSize.height() - 1;
317    bounds.offset(-fKernelOffset);
318    if (getInput(0) && !getInput(0)->filterBounds(bounds, ctm, &bounds)) {
319        return false;
320    }
321    *dst = bounds;
322    return true;
323}
324
325#if SK_SUPPORT_GPU
326
327///////////////////////////////////////////////////////////////////////////////
328
329class GrGLMatrixConvolutionEffect;
330
331class GrMatrixConvolutionEffect : public GrSingleTextureEffect {
332public:
333    typedef SkMatrixConvolutionImageFilter::TileMode TileMode;
334    static GrEffectRef* Create(GrTexture* texture,
335                               const SkIRect& bounds,
336                               const SkISize& kernelSize,
337                               const SkScalar* kernel,
338                               SkScalar gain,
339                               SkScalar bias,
340                               const SkIPoint& kernelOffset,
341                               TileMode tileMode,
342                               bool convolveAlpha) {
343        AutoEffectUnref effect(SkNEW_ARGS(GrMatrixConvolutionEffect, (texture,
344                                                                      bounds,
345                                                                      kernelSize,
346                                                                      kernel,
347                                                                      gain,
348                                                                      bias,
349                                                                      kernelOffset,
350                                                                      tileMode,
351                                                                      convolveAlpha)));
352        return CreateEffectRef(effect);
353    }
354    virtual ~GrMatrixConvolutionEffect();
355
356    virtual void getConstantColorComponents(GrColor* color,
357                                            uint32_t* validFlags) const SK_OVERRIDE {
358        // TODO: Try to do better?
359        *validFlags = 0;
360    }
361
362    static const char* Name() { return "MatrixConvolution"; }
363    const SkIRect& bounds() const { return fBounds; }
364    const SkISize& kernelSize() const { return fKernelSize; }
365    const float* kernelOffset() const { return fKernelOffset; }
366    const float* kernel() const { return fKernel; }
367    float gain() const { return fGain; }
368    float bias() const { return fBias; }
369    TileMode tileMode() const { return fTileMode; }
370    bool convolveAlpha() const { return fConvolveAlpha; }
371
372    typedef GrGLMatrixConvolutionEffect GLEffect;
373
374    virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
375
376private:
377    GrMatrixConvolutionEffect(GrTexture*,
378                              const SkIRect& bounds,
379                              const SkISize& kernelSize,
380                              const SkScalar* kernel,
381                              SkScalar gain,
382                              SkScalar bias,
383                              const SkIPoint& kernelOffset,
384                              TileMode tileMode,
385                              bool convolveAlpha);
386
387    virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
388
389    SkIRect  fBounds;
390    SkISize  fKernelSize;
391    float   *fKernel;
392    float    fGain;
393    float    fBias;
394    float    fKernelOffset[2];
395    TileMode fTileMode;
396    bool     fConvolveAlpha;
397
398    GR_DECLARE_EFFECT_TEST;
399
400    typedef GrSingleTextureEffect INHERITED;
401};
402
403class GrGLMatrixConvolutionEffect : public GrGLEffect {
404public:
405    GrGLMatrixConvolutionEffect(const GrBackendEffectFactory& factory,
406                                const GrDrawEffect& effect);
407    virtual void emitCode(GrGLShaderBuilder*,
408                          const GrDrawEffect&,
409                          EffectKey,
410                          const char* outputColor,
411                          const char* inputColor,
412                          const TransformedCoordsArray&,
413                          const TextureSamplerArray&) SK_OVERRIDE;
414
415    static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&);
416
417    virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE;
418
419private:
420    typedef GrGLUniformManager::UniformHandle        UniformHandle;
421    typedef SkMatrixConvolutionImageFilter::TileMode TileMode;
422    SkISize             fKernelSize;
423    TileMode            fTileMode;
424    bool                fConvolveAlpha;
425
426    UniformHandle       fBoundsUni;
427    UniformHandle       fKernelUni;
428    UniformHandle       fImageIncrementUni;
429    UniformHandle       fKernelOffsetUni;
430    UniformHandle       fGainUni;
431    UniformHandle       fBiasUni;
432
433    typedef GrGLEffect INHERITED;
434};
435
436GrGLMatrixConvolutionEffect::GrGLMatrixConvolutionEffect(const GrBackendEffectFactory& factory,
437                                                         const GrDrawEffect& drawEffect)
438    : INHERITED(factory) {
439    const GrMatrixConvolutionEffect& m = drawEffect.castEffect<GrMatrixConvolutionEffect>();
440    fKernelSize = m.kernelSize();
441    fTileMode = m.tileMode();
442    fConvolveAlpha = m.convolveAlpha();
443}
444
445static void appendTextureLookup(GrGLShaderBuilder* builder,
446                                const GrGLShaderBuilder::TextureSampler& sampler,
447                                const char* coord,
448                                const char* bounds,
449                                SkMatrixConvolutionImageFilter::TileMode tileMode) {
450    SkString clampedCoord;
451    switch (tileMode) {
452        case SkMatrixConvolutionImageFilter::kClamp_TileMode:
453            clampedCoord.printf("clamp(%s, %s.xy, %s.zw)", coord, bounds, bounds);
454            coord = clampedCoord.c_str();
455            break;
456        case SkMatrixConvolutionImageFilter::kRepeat_TileMode:
457            clampedCoord.printf("mod(%s - %s.xy, %s.zw - %s.xy) + %s.xy", coord, bounds, bounds, bounds, bounds);
458            coord = clampedCoord.c_str();
459            break;
460        case SkMatrixConvolutionImageFilter::kClampToBlack_TileMode:
461            builder->fsCodeAppendf("clamp(%s, %s.xy, %s.zw) != %s ? vec4(0, 0, 0, 0) : ", coord, bounds, bounds, coord);
462            break;
463    }
464    builder->fsAppendTextureLookup(sampler, coord);
465}
466
467void GrGLMatrixConvolutionEffect::emitCode(GrGLShaderBuilder* builder,
468                                           const GrDrawEffect&,
469                                           EffectKey key,
470                                           const char* outputColor,
471                                           const char* inputColor,
472                                           const TransformedCoordsArray& coords,
473                                           const TextureSamplerArray& samplers) {
474    sk_ignore_unused_variable(inputColor);
475    SkString coords2D = builder->ensureFSCoords2D(coords, 0);
476    fBoundsUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
477                                     kVec4f_GrSLType, "Bounds");
478    fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
479                                             kVec2f_GrSLType, "ImageIncrement");
480    fKernelUni = builder->addUniformArray(GrGLShaderBuilder::kFragment_Visibility,
481                                             kFloat_GrSLType,
482                                             "Kernel",
483                                             fKernelSize.width() * fKernelSize.height());
484    fKernelOffsetUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
485                                             kVec2f_GrSLType, "KernelOffset");
486    fGainUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
487                                   kFloat_GrSLType, "Gain");
488    fBiasUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
489                                   kFloat_GrSLType, "Bias");
490
491    const char* bounds = builder->getUniformCStr(fBoundsUni);
492    const char* kernelOffset = builder->getUniformCStr(fKernelOffsetUni);
493    const char* imgInc = builder->getUniformCStr(fImageIncrementUni);
494    const char* kernel = builder->getUniformCStr(fKernelUni);
495    const char* gain = builder->getUniformCStr(fGainUni);
496    const char* bias = builder->getUniformCStr(fBiasUni);
497    int kWidth = fKernelSize.width();
498    int kHeight = fKernelSize.height();
499
500    builder->fsCodeAppend("\t\tvec4 sum = vec4(0, 0, 0, 0);\n");
501    builder->fsCodeAppendf("\t\tvec2 coord = %s - %s * %s;\n", coords2D.c_str(), kernelOffset, imgInc);
502    builder->fsCodeAppendf("\t\tfor (int y = 0; y < %d; y++) {\n", kHeight);
503    builder->fsCodeAppendf("\t\t\tfor (int x = 0; x < %d; x++) {\n", kWidth);
504    builder->fsCodeAppendf("\t\t\t\tfloat k = %s[y * %d + x];\n", kernel, kWidth);
505    builder->fsCodeAppendf("\t\t\t\tvec2 coord2 = coord + vec2(x, y) * %s;\n", imgInc);
506    builder->fsCodeAppend("\t\t\t\tvec4 c = ");
507    appendTextureLookup(builder, samplers[0], "coord2", bounds, fTileMode);
508    builder->fsCodeAppend(";\n");
509    if (!fConvolveAlpha) {
510        builder->fsCodeAppend("\t\t\t\tc.rgb /= c.a;\n");
511    }
512    builder->fsCodeAppend("\t\t\t\tsum += c * k;\n");
513    builder->fsCodeAppend("\t\t\t}\n");
514    builder->fsCodeAppend("\t\t}\n");
515    if (fConvolveAlpha) {
516        builder->fsCodeAppendf("\t\t%s = sum * %s + %s;\n", outputColor, gain, bias);
517        builder->fsCodeAppendf("\t\t%s.rgb = clamp(%s.rgb, 0.0, %s.a);\n",
518            outputColor, outputColor, outputColor);
519    } else {
520        builder->fsCodeAppend("\t\tvec4 c = ");
521        appendTextureLookup(builder, samplers[0], coords2D.c_str(), bounds, fTileMode);
522        builder->fsCodeAppend(";\n");
523        builder->fsCodeAppendf("\t\t%s.a = c.a;\n", outputColor);
524        builder->fsCodeAppendf("\t\t%s.rgb = sum.rgb * %s + %s;\n", outputColor, gain, bias);
525        builder->fsCodeAppendf("\t\t%s.rgb *= %s.a;\n", outputColor, outputColor);
526    }
527}
528
529namespace {
530
531int encodeXY(int x, int y) {
532    SkASSERT(x >= 1 && y >= 1 && x * y <= 32);
533    if (y < x)
534        return 0x40 | encodeXY(y, x);
535    else
536        return (0x40 >> x) | (y - x);
537}
538
539};
540
541GrGLEffect::EffectKey GrGLMatrixConvolutionEffect::GenKey(const GrDrawEffect& drawEffect,
542                                                          const GrGLCaps&) {
543    const GrMatrixConvolutionEffect& m = drawEffect.castEffect<GrMatrixConvolutionEffect>();
544    EffectKey key = encodeXY(m.kernelSize().width(), m.kernelSize().height());
545    key |= m.tileMode() << 7;
546    key |= m.convolveAlpha() ? 1 << 9 : 0;
547    return key;
548}
549
550void GrGLMatrixConvolutionEffect::setData(const GrGLUniformManager& uman,
551                                          const GrDrawEffect& drawEffect) {
552    const GrMatrixConvolutionEffect& conv = drawEffect.castEffect<GrMatrixConvolutionEffect>();
553    GrTexture& texture = *conv.texture(0);
554    // the code we generated was for a specific kernel size
555    SkASSERT(conv.kernelSize() == fKernelSize);
556    SkASSERT(conv.tileMode() == fTileMode);
557    float imageIncrement[2];
558    float ySign = texture.origin() == kTopLeft_GrSurfaceOrigin ? 1.0f : -1.0f;
559    imageIncrement[0] = 1.0f / texture.width();
560    imageIncrement[1] = ySign / texture.height();
561    uman.set2fv(fImageIncrementUni, 1, imageIncrement);
562    uman.set2fv(fKernelOffsetUni, 1, conv.kernelOffset());
563    uman.set1fv(fKernelUni, fKernelSize.width() * fKernelSize.height(), conv.kernel());
564    uman.set1f(fGainUni, conv.gain());
565    uman.set1f(fBiasUni, conv.bias());
566    const SkIRect& bounds = conv.bounds();
567    float left = (float) bounds.left() / texture.width();
568    float top = (float) bounds.top() / texture.height();
569    float right = (float) bounds.right() / texture.width();
570    float bottom = (float) bounds.bottom() / texture.height();
571    if (texture.origin() == kBottomLeft_GrSurfaceOrigin) {
572        uman.set4f(fBoundsUni, left, 1.0f - bottom, right, 1.0f - top);
573    } else {
574        uman.set4f(fBoundsUni, left, top, right, bottom);
575    }
576}
577
578GrMatrixConvolutionEffect::GrMatrixConvolutionEffect(GrTexture* texture,
579                                                     const SkIRect& bounds,
580                                                     const SkISize& kernelSize,
581                                                     const SkScalar* kernel,
582                                                     SkScalar gain,
583                                                     SkScalar bias,
584                                                     const SkIPoint& kernelOffset,
585                                                     TileMode tileMode,
586                                                     bool convolveAlpha)
587  : INHERITED(texture, MakeDivByTextureWHMatrix(texture)),
588    fBounds(bounds),
589    fKernelSize(kernelSize),
590    fGain(SkScalarToFloat(gain)),
591    fBias(SkScalarToFloat(bias) / 255.0f),
592    fTileMode(tileMode),
593    fConvolveAlpha(convolveAlpha) {
594    fKernel = new float[kernelSize.width() * kernelSize.height()];
595    for (int i = 0; i < kernelSize.width() * kernelSize.height(); i++) {
596        fKernel[i] = SkScalarToFloat(kernel[i]);
597    }
598    fKernelOffset[0] = static_cast<float>(kernelOffset.x());
599    fKernelOffset[1] = static_cast<float>(kernelOffset.y());
600    this->setWillNotUseInputColor();
601}
602
603GrMatrixConvolutionEffect::~GrMatrixConvolutionEffect() {
604    delete[] fKernel;
605}
606
607const GrBackendEffectFactory& GrMatrixConvolutionEffect::getFactory() const {
608    return GrTBackendEffectFactory<GrMatrixConvolutionEffect>::getInstance();
609}
610
611bool GrMatrixConvolutionEffect::onIsEqual(const GrEffect& sBase) const {
612    const GrMatrixConvolutionEffect& s = CastEffect<GrMatrixConvolutionEffect>(sBase);
613    return this->texture(0) == s.texture(0) &&
614           fKernelSize == s.kernelSize() &&
615           !memcmp(fKernel, s.kernel(),
616                   fKernelSize.width() * fKernelSize.height() * sizeof(float)) &&
617           fGain == s.gain() &&
618           fBias == s.bias() &&
619           fKernelOffset == s.kernelOffset() &&
620           fTileMode == s.tileMode() &&
621           fConvolveAlpha == s.convolveAlpha();
622}
623
624GR_DEFINE_EFFECT_TEST(GrMatrixConvolutionEffect);
625
626// A little bit less than the minimum # uniforms required by DX9SM2 (32).
627// Allows for a 5x5 kernel (or 25x1, for that matter).
628#define MAX_KERNEL_SIZE 25
629
630GrEffectRef* GrMatrixConvolutionEffect::TestCreate(SkRandom* random,
631                                                   GrContext* context,
632                                                   const GrDrawTargetCaps&,
633                                                   GrTexture* textures[]) {
634    int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx :
635                                      GrEffectUnitTest::kAlphaTextureIdx;
636    int width = random->nextRangeU(1, MAX_KERNEL_SIZE);
637    int height = random->nextRangeU(1, MAX_KERNEL_SIZE / width);
638    SkISize kernelSize = SkISize::Make(width, height);
639    SkAutoTDeleteArray<SkScalar> kernel(new SkScalar[width * height]);
640    for (int i = 0; i < width * height; i++) {
641        kernel.get()[i] = random->nextSScalar1();
642    }
643    SkScalar gain = random->nextSScalar1();
644    SkScalar bias = random->nextSScalar1();
645    SkIPoint kernelOffset = SkIPoint::Make(random->nextRangeU(0, kernelSize.width()),
646                                           random->nextRangeU(0, kernelSize.height()));
647    SkIRect bounds = SkIRect::MakeXYWH(random->nextRangeU(0, textures[texIdx]->width()),
648                                       random->nextRangeU(0, textures[texIdx]->height()),
649                                       random->nextRangeU(0, textures[texIdx]->width()),
650                                       random->nextRangeU(0, textures[texIdx]->height()));
651    TileMode tileMode = static_cast<TileMode>(random->nextRangeU(0, 2));
652    bool convolveAlpha = random->nextBool();
653    return GrMatrixConvolutionEffect::Create(textures[texIdx],
654                                             bounds,
655                                             kernelSize,
656                                             kernel.get(),
657                                             gain,
658                                             bias,
659                                             kernelOffset,
660                                             tileMode,
661                                             convolveAlpha);
662}
663
664bool SkMatrixConvolutionImageFilter::asNewEffect(GrEffectRef** effect,
665                                                 GrTexture* texture,
666                                                 const SkMatrix&,
667                                                 const SkIRect& bounds
668                                                 ) const {
669    if (!effect) {
670        return fKernelSize.width() * fKernelSize.height() <= MAX_KERNEL_SIZE;
671    }
672    SkASSERT(fKernelSize.width() * fKernelSize.height() <= MAX_KERNEL_SIZE);
673    *effect = GrMatrixConvolutionEffect::Create(texture,
674                                                bounds,
675                                                fKernelSize,
676                                                fKernel,
677                                                fGain,
678                                                fBias,
679                                                fKernelOffset,
680                                                fTileMode,
681                                                fConvolveAlpha);
682    return true;
683}
684
685///////////////////////////////////////////////////////////////////////////////
686
687#endif
688