1/*
2 * Copyright 2013 Google Inc.
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#include "SampleCode.h"
8#include "Sk1DPathEffect.h"
9#include "Sk2DPathEffect.h"
10#include "SkAlphaThresholdFilter.h"
11#include "SkArcToPathEffect.h"
12#include "SkAnnotation.h"
13#include "SkBlurImageFilter.h"
14#include "SkBlurMaskFilter.h"
15#include "SkCanvas.h"
16#include "SkColorCubeFilter.h"
17#include "SkColorFilter.h"
18#include "SkColorFilterImageFilter.h"
19#include "SkColorMatrixFilter.h"
20#include "SkComposeImageFilter.h"
21#include "SkCornerPathEffect.h"
22#include "SkDashPathEffect.h"
23#include "SkData.h"
24#include "SkDiscretePathEffect.h"
25#include "SkDisplacementMapEffect.h"
26#include "SkDropShadowImageFilter.h"
27#include "SkEmbossMaskFilter.h"
28#include "SkFlattenableSerialization.h"
29#include "SkImageSource.h"
30#include "SkLayerRasterizer.h"
31#include "SkLightingImageFilter.h"
32#include "SkLumaColorFilter.h"
33#include "SkMagnifierImageFilter.h"
34#include "SkMatrixConvolutionImageFilter.h"
35#include "SkMergeImageFilter.h"
36#include "SkMorphologyImageFilter.h"
37#include "SkOffsetImageFilter.h"
38#include "SkPaintImageFilter.h"
39#include "SkPerlinNoiseShader.h"
40#include "SkPictureImageFilter.h"
41#include "SkPictureRecorder.h"
42#include "SkPoint3.h"
43#include "SkRandom.h"
44#include "SkTableColorFilter.h"
45#include "SkTestImageFilters.h"
46#include "SkTileImageFilter.h"
47#include "SkTypeface.h"
48#include "SkView.h"
49#include "SkXfermodeImageFilter.h"
50#include <stdio.h>
51#include <time.h>
52
53//#define SK_ADD_RANDOM_BIT_FLIPS
54//#define SK_FUZZER_IS_VERBOSE
55
56static const uint32_t kSeed = (uint32_t)(time(nullptr));
57static SkRandom gRand(kSeed);
58static bool return_large = false;
59static bool return_undef = false;
60
61static const int kBitmapSize = 24;
62
63static int R(float x) {
64    return (int)floor(SkScalarToFloat(gRand.nextUScalar1()) * x);
65}
66
67#if defined _WIN32
68#pragma warning ( push )
69// we are intentionally causing an overflow here
70//      (warning C4756: overflow in constant arithmetic)
71#pragma warning ( disable : 4756 )
72#endif
73
74static float huge() {
75    double d = 1e100;
76    float f = (float)d;
77    return f;
78}
79
80#if defined _WIN32
81#pragma warning ( pop )
82#endif
83
84static float make_number(bool positiveOnly) {
85    float f = positiveOnly ? 1.0f : 0.0f;
86    float v = f;
87    int sel;
88
89    if (return_large) sel = R(6); else sel = R(4);
90    if (!return_undef && sel == 0) sel = 1;
91
92    if (R(2) == 1) v = (float)(R(100)+f); else
93
94    switch (sel) {
95        case 0: break;
96        case 1: v = f; break;
97        case 2: v = 0.000001f; break;
98        case 3: v = 10000.0f; break;
99        case 4: v = 2000000000.0f; break;
100        case 5: v = huge(); break;
101    }
102
103    if (!positiveOnly && (R(4) == 1)) v = -v;
104    return v;
105}
106
107static SkScalar make_scalar(bool positiveOnly = false) {
108    return make_number(positiveOnly);
109}
110
111static SkString make_string() {
112    int length = R(1000);
113    SkString str(length);
114    for (int i = 0; i < length; ++i) {
115        str[i] = static_cast<char>(R(256));
116    }
117    return str;
118}
119
120static SkString make_font_name() {
121    int sel = R(8);
122
123    switch(sel) {
124        case 0: return SkString("Courier New");
125        case 1: return SkString("Helvetica");
126        case 2: return SkString("monospace");
127        case 3: return SkString("sans-serif");
128        case 4: return SkString("serif");
129        case 5: return SkString("Times");
130        case 6: return SkString("Times New Roman");
131        case 7:
132        default:
133            return make_string();
134    }
135}
136
137static bool make_bool() {
138    return R(2) == 1;
139}
140
141static SkRect make_rect() {
142    return SkRect::MakeWH(SkIntToScalar(R(static_cast<float>(kBitmapSize))),
143                          SkIntToScalar(R(static_cast<float>(kBitmapSize))));
144}
145
146static SkRegion make_region() {
147    SkIRect iRegion = SkIRect::MakeXYWH(R(static_cast<float>(kBitmapSize)),
148                                        R(static_cast<float>(kBitmapSize)),
149                                        R(static_cast<float>(kBitmapSize)),
150                                        R(static_cast<float>(kBitmapSize)));
151    return SkRegion(iRegion);
152}
153
154static SkMatrix make_matrix() {
155    SkMatrix m;
156    for (int i = 0; i < 9; ++i) {
157        m[i] = make_scalar();
158    }
159    return m;
160}
161
162static SkXfermode::Mode make_xfermode() {
163    return static_cast<SkXfermode::Mode>(R(SkXfermode::kLastMode+1));
164}
165
166static SkPaint::Align make_paint_align() {
167    return static_cast<SkPaint::Align>(R(SkPaint::kRight_Align+1));
168}
169
170static SkPaint::Hinting make_paint_hinting() {
171    return static_cast<SkPaint::Hinting>(R(SkPaint::kFull_Hinting+1));
172}
173
174static SkPaint::Style make_paint_style() {
175    return static_cast<SkPaint::Style>(R(SkPaint::kStrokeAndFill_Style+1));
176}
177
178static SkPaint::Cap make_paint_cap() {
179    return static_cast<SkPaint::Cap>(R(SkPaint::kDefault_Cap+1));
180}
181
182static SkPaint::Join make_paint_join() {
183    return static_cast<SkPaint::Join>(R(SkPaint::kDefault_Join+1));
184}
185
186static SkPaint::TextEncoding make_paint_text_encoding() {
187    return static_cast<SkPaint::TextEncoding>(R(SkPaint::kGlyphID_TextEncoding+1));
188}
189
190static SkBlurStyle make_blur_style() {
191    return static_cast<SkBlurStyle>(R(kLastEnum_SkBlurStyle+1));
192}
193
194static SkBlurMaskFilter::BlurFlags make_blur_mask_filter_flag() {
195    return static_cast<SkBlurMaskFilter::BlurFlags>(R(SkBlurMaskFilter::kAll_BlurFlag+1));
196}
197
198static SkFilterQuality make_filter_quality() {
199    return static_cast<SkFilterQuality>(R(kHigh_SkFilterQuality+1));
200}
201
202static SkTypeface::Style make_typeface_style() {
203    return static_cast<SkTypeface::Style>(R(SkTypeface::kBoldItalic+1));
204}
205
206static SkPath1DPathEffect::Style make_path_1d_path_effect_style() {
207    return static_cast<SkPath1DPathEffect::Style>(R((int)SkPath1DPathEffect::kLastEnum_Style + 1));
208}
209
210static SkColor make_color() {
211    return (R(2) == 1) ? 0xFFC0F0A0 : 0xFF000090;
212}
213
214static SkDropShadowImageFilter::ShadowMode make_shadow_mode() {
215    return (R(2) == 1) ? SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode :
216                         SkDropShadowImageFilter::kDrawShadowOnly_ShadowMode;
217}
218
219static SkPoint3 make_point() {
220    return SkPoint3::Make(make_scalar(), make_scalar(), make_scalar(true));
221}
222
223static SkDisplacementMapEffect::ChannelSelectorType make_channel_selector_type() {
224    return static_cast<SkDisplacementMapEffect::ChannelSelectorType>(R(4)+1);
225}
226
227static bool valid_for_raster_canvas(const SkImageInfo& info) {
228    switch (info.colorType()) {
229        case kAlpha_8_SkColorType:
230        case kRGB_565_SkColorType:
231            return true;
232        case kN32_SkColorType:
233            return kPremul_SkAlphaType == info.alphaType() ||
234                   kOpaque_SkAlphaType == info.alphaType();
235        default:
236            break;
237    }
238    return false;
239}
240
241static SkColorType rand_colortype() {
242    return (SkColorType)R(kLastEnum_SkColorType + 1);
243}
244
245static void rand_bitmap_for_canvas(SkBitmap* bitmap) {
246    SkImageInfo info;
247    do {
248        info = SkImageInfo::Make(kBitmapSize, kBitmapSize, rand_colortype(),
249                                 kPremul_SkAlphaType);
250    } while (!valid_for_raster_canvas(info) || !bitmap->tryAllocPixels(info));
251}
252
253static void make_g_bitmap(SkBitmap& bitmap) {
254    rand_bitmap_for_canvas(&bitmap);
255
256    SkCanvas canvas(bitmap);
257    canvas.clear(0x00000000);
258    SkPaint paint;
259    paint.setAntiAlias(true);
260    paint.setColor(0xFF884422);
261    paint.setTextSize(SkIntToScalar(kBitmapSize/2));
262    const char* str = "g";
263    canvas.drawText(str, strlen(str), SkIntToScalar(kBitmapSize/8),
264                    SkIntToScalar(kBitmapSize/4), paint);
265}
266
267static void make_checkerboard_bitmap(SkBitmap& bitmap) {
268    rand_bitmap_for_canvas(&bitmap);
269
270    SkCanvas canvas(bitmap);
271    canvas.clear(0x00000000);
272    SkPaint darkPaint;
273    darkPaint.setColor(0xFF804020);
274    SkPaint lightPaint;
275    lightPaint.setColor(0xFF244484);
276    const int i = kBitmapSize / 8;
277    const SkScalar f = SkIntToScalar(i);
278    for (int y = 0; y < kBitmapSize; y += i) {
279        for (int x = 0; x < kBitmapSize; x += i) {
280            canvas.save();
281            canvas.translate(SkIntToScalar(x), SkIntToScalar(y));
282            canvas.drawRect(SkRect::MakeXYWH(0, 0, f, f), darkPaint);
283            canvas.drawRect(SkRect::MakeXYWH(f, 0, f, f), lightPaint);
284            canvas.drawRect(SkRect::MakeXYWH(0, f, f, f), lightPaint);
285            canvas.drawRect(SkRect::MakeXYWH(f, f, f, f), darkPaint);
286            canvas.restore();
287        }
288    }
289}
290
291static const SkBitmap& make_bitmap() {
292    static SkBitmap bitmap[2];
293    static bool initialized = false;
294    if (!initialized) {
295        make_g_bitmap(bitmap[0]);
296        make_checkerboard_bitmap(bitmap[1]);
297        initialized = true;
298    }
299    return bitmap[R(2)];
300}
301
302static SkData* make_3Dlut(int* cubeDimension, bool invR, bool invG, bool invB) {
303    int size = 4 << R(5);
304    SkData* data = SkData::NewUninitialized(sizeof(SkColor) * size * size * size);
305    SkColor* pixels = (SkColor*)(data->writable_data());
306    SkAutoTMalloc<uint8_t> lutMemory(size);
307    SkAutoTMalloc<uint8_t> invLutMemory(size);
308    uint8_t* lut = lutMemory.get();
309    uint8_t* invLut = invLutMemory.get();
310    const int maxIndex = size - 1;
311    for (int i = 0; i < size; i++) {
312        lut[i] = (i * 255) / maxIndex;
313        invLut[i] = ((maxIndex - i) * 255) / maxIndex;
314    }
315    for (int r = 0; r < size; ++r) {
316        for (int g = 0; g < size; ++g) {
317            for (int b = 0; b < size; ++b) {
318                pixels[(size * ((size * b) + g)) + r] = SkColorSetARGB(0xFF,
319                        invR ? invLut[r] : lut[r],
320                        invG ? invLut[g] : lut[g],
321                        invB ? invLut[b] : lut[b]);
322            }
323        }
324    }
325    if (cubeDimension) {
326        *cubeDimension = size;
327    }
328    return data;
329}
330
331static void drawSomething(SkCanvas* canvas) {
332    SkPaint paint;
333
334    canvas->save();
335    canvas->scale(0.5f, 0.5f);
336    canvas->drawBitmap(make_bitmap(), 0, 0, nullptr);
337    canvas->restore();
338
339    paint.setAntiAlias(true);
340
341    paint.setColor(SK_ColorRED);
342    canvas->drawCircle(SkIntToScalar(kBitmapSize/2), SkIntToScalar(kBitmapSize/2), SkIntToScalar(kBitmapSize/3), paint);
343    paint.setColor(SK_ColorBLACK);
344    paint.setTextSize(SkIntToScalar(kBitmapSize/3));
345    canvas->drawText("Picture", 7, SkIntToScalar(kBitmapSize/2), SkIntToScalar(kBitmapSize/4), paint);
346}
347
348static void rand_color_table(uint8_t* table) {
349    for (int i = 0; i < 256; ++i) {
350        table[i] = R(256);
351    }
352}
353
354static SkColorFilter* make_color_filter() {
355    SkColorFilter* colorFilter;
356    switch (R(6)) {
357        case 0: {
358            SkScalar array[20];
359            for (int i = 0; i < 20; ++i) {
360                array[i] = make_scalar();
361            }
362            colorFilter = SkColorMatrixFilter::Create(array);
363            break;
364        }
365        case 1:
366            colorFilter = SkLumaColorFilter::Create();
367            break;
368        case 2: {
369            uint8_t tableA[256];
370            uint8_t tableR[256];
371            uint8_t tableG[256];
372            uint8_t tableB[256];
373            rand_color_table(tableA);
374            rand_color_table(tableR);
375            rand_color_table(tableG);
376            rand_color_table(tableB);
377            colorFilter = SkTableColorFilter::CreateARGB(tableA, tableR, tableG, tableB);
378            break;
379        }
380        case 3:
381            colorFilter = SkColorFilter::CreateModeFilter(make_color(), make_xfermode());
382            break;
383        case 4:
384            colorFilter = SkColorMatrixFilter::CreateLightingFilter(make_color(), make_color());
385            break;
386        case 5:
387        default:
388            colorFilter = nullptr;
389            break;
390    }
391    return colorFilter;
392}
393
394static SkPath make_path() {
395    SkPath path;
396    int numOps = R(30);
397    for (int i = 0; i < numOps; ++i) {
398        switch (R(6)) {
399            case 0:
400                path.moveTo(make_scalar(), make_scalar());
401                break;
402            case 1:
403                path.lineTo(make_scalar(), make_scalar());
404                break;
405            case 2:
406                path.quadTo(make_scalar(), make_scalar(), make_scalar(), make_scalar());
407                break;
408            case 3:
409                path.conicTo(make_scalar(), make_scalar(), make_scalar(), make_scalar(), make_scalar());
410                break;
411            case 4:
412                path.cubicTo(make_scalar(), make_scalar(), make_scalar(),
413                             make_scalar(), make_scalar(), make_scalar());
414                break;
415            case 5:
416            default:
417                path.arcTo(make_scalar(), make_scalar(), make_scalar(), make_scalar(), make_scalar());
418                break;
419
420        }
421    }
422    path.close();
423    return path;
424}
425
426static SkPathEffect* make_path_effect(bool canBeNull = true) {
427    SkPathEffect* pathEffect = nullptr;
428    if (canBeNull && (R(3) == 1)) { return pathEffect; }
429
430    switch (R(9)) {
431        case 0:
432            pathEffect = SkArcToPathEffect::Create(make_scalar(true));
433            break;
434        case 1: {
435            SkAutoTUnref<SkPathEffect> outer(make_path_effect(false));
436            SkAutoTUnref<SkPathEffect> inner(make_path_effect(false));
437            pathEffect = SkComposePathEffect::Create(outer, inner);
438            break;
439        }
440        case 2:
441            pathEffect = SkCornerPathEffect::Create(make_scalar());
442            break;
443        case 3: {
444            int count = R(10);
445            SkScalar intervals[10];
446            for (int i = 0; i < count; ++i) {
447                intervals[i] = make_scalar();
448            }
449            pathEffect = SkDashPathEffect::Create(intervals, count, make_scalar());
450            break;
451        }
452        case 4:
453            pathEffect = SkDiscretePathEffect::Create(make_scalar(), make_scalar());
454            break;
455        case 5:
456            pathEffect = SkPath1DPathEffect::Create(make_path(),
457                                                    make_scalar(),
458                                                    make_scalar(),
459                                                    make_path_1d_path_effect_style());
460            break;
461        case 6:
462            pathEffect = SkLine2DPathEffect::Create(make_scalar(), make_matrix());
463            break;
464        case 7:
465            pathEffect = SkPath2DPathEffect::Create(make_matrix(), make_path());
466            break;
467        case 8:
468        default:
469            pathEffect = SkSumPathEffect::Create(make_path_effect(false),
470                                                 make_path_effect(false));
471            break;
472    }
473    return pathEffect;
474}
475
476static SkMaskFilter* make_mask_filter() {
477    SkMaskFilter* maskFilter;
478    switch (R(3)) {
479        case 0:
480            maskFilter = SkBlurMaskFilter::Create(make_blur_style(),
481                                                  make_scalar(),
482                                                  make_blur_mask_filter_flag());
483        case 1: {
484            SkEmbossMaskFilter::Light light;
485            for (int i = 0; i < 3; ++i) {
486                light.fDirection[i] = make_scalar();
487            }
488            light.fPad = R(65536);
489            light.fAmbient = R(256);
490            light.fSpecular = R(256);
491            maskFilter = SkEmbossMaskFilter::Create(make_scalar(),
492                                                    light);
493        }
494        case 2:
495        default:
496            maskFilter = nullptr;
497            break;
498    }
499    return maskFilter;
500}
501
502static SkImageFilter* make_image_filter(bool canBeNull = true);
503
504static SkPaint make_paint() {
505    SkPaint paint;
506    paint.setHinting(make_paint_hinting());
507    paint.setAntiAlias(make_bool());
508    paint.setDither(make_bool());
509    paint.setLinearText(make_bool());
510    paint.setSubpixelText(make_bool());
511    paint.setLCDRenderText(make_bool());
512    paint.setEmbeddedBitmapText(make_bool());
513    paint.setAutohinted(make_bool());
514    paint.setVerticalText(make_bool());
515    paint.setUnderlineText(make_bool());
516    paint.setStrikeThruText(make_bool());
517    paint.setFakeBoldText(make_bool());
518    paint.setDevKernText(make_bool());
519    paint.setFilterQuality(make_filter_quality());
520    paint.setStyle(make_paint_style());
521    paint.setColor(make_color());
522    paint.setStrokeWidth(make_scalar());
523    paint.setStrokeMiter(make_scalar());
524    paint.setStrokeCap(make_paint_cap());
525    paint.setStrokeJoin(make_paint_join());
526    paint.setColorFilter(make_color_filter());
527    paint.setXfermodeMode(make_xfermode());
528    paint.setPathEffect(make_path_effect());
529    paint.setMaskFilter(make_mask_filter());
530
531    if (false) {
532        // our validating buffer does not support typefaces yet, so skip this for now
533        SkAutoTUnref<SkTypeface> typeface(
534                      SkTypeface::CreateFromName(make_font_name().c_str(), make_typeface_style()));
535        paint.setTypeface(typeface);
536    }
537
538    SkLayerRasterizer::Builder rasterizerBuilder;
539    SkPaint paintForRasterizer;
540    if (R(2) == 1) {
541        paintForRasterizer = make_paint();
542    }
543    rasterizerBuilder.addLayer(paintForRasterizer);
544    SkAutoTUnref<SkRasterizer> rasterizer(rasterizerBuilder.detachRasterizer());
545    paint.setRasterizer(rasterizer);
546    paint.setImageFilter(make_image_filter());
547    SkAutoDataUnref data(make_3Dlut(nullptr, make_bool(), make_bool(), make_bool()));
548    SkAutoTUnref<SkAnnotation> annotation(
549        SkAnnotation::Create(make_string().c_str(), data));
550    paint.setAnnotation(annotation);
551    paint.setTextAlign(make_paint_align());
552    paint.setTextSize(make_scalar());
553    paint.setTextScaleX(make_scalar());
554    paint.setTextSkewX(make_scalar());
555    paint.setTextEncoding(make_paint_text_encoding());
556    return paint;
557}
558
559static SkImageFilter* make_image_filter(bool canBeNull) {
560    SkImageFilter* filter = 0;
561
562    // Add a 1 in 3 chance to get a nullptr input
563    if (canBeNull && (R(3) == 1)) { return filter; }
564
565    enum { ALPHA_THRESHOLD, MERGE, COLOR, LUT3D, BLUR, MAGNIFIER,
566           DOWN_SAMPLE, XFERMODE, OFFSET, MATRIX, MATRIX_CONVOLUTION, COMPOSE,
567           DISTANT_LIGHT, POINT_LIGHT, SPOT_LIGHT, NOISE, DROP_SHADOW,
568           MORPHOLOGY, BITMAP, DISPLACE, TILE, PICTURE, PAINT, NUM_FILTERS };
569
570    switch (R(NUM_FILTERS)) {
571    case ALPHA_THRESHOLD:
572        filter = SkAlphaThresholdFilter::Create(make_region(), make_scalar(), make_scalar());
573        break;
574    case MERGE:
575        filter = SkMergeImageFilter::Create(make_image_filter(), make_image_filter(), make_xfermode());
576        break;
577    case COLOR:
578    {
579        SkAutoTUnref<SkColorFilter> cf(make_color_filter());
580        filter = cf.get() ? SkColorFilterImageFilter::Create(cf, make_image_filter()) : 0;
581    }
582        break;
583    case LUT3D:
584    {
585        int cubeDimension;
586        SkAutoDataUnref lut3D(make_3Dlut(&cubeDimension, (R(2) == 1), (R(2) == 1), (R(2) == 1)));
587        SkAutoTUnref<SkColorFilter> cf(SkColorCubeFilter::Create(lut3D, cubeDimension));
588        filter = cf.get() ? SkColorFilterImageFilter::Create(cf, make_image_filter()) : 0;
589    }
590        break;
591    case BLUR:
592        filter = SkBlurImageFilter::Create(make_scalar(true), make_scalar(true), make_image_filter());
593        break;
594    case MAGNIFIER:
595        filter = SkMagnifierImageFilter::Create(make_rect(), make_scalar(true));
596        break;
597    case DOWN_SAMPLE:
598        filter = SkDownSampleImageFilter::Create(make_scalar());
599        break;
600    case XFERMODE:
601    {
602        SkAutoTUnref<SkXfermode> mode(SkXfermode::Create(make_xfermode()));
603        filter = SkXfermodeImageFilter::Create(mode, make_image_filter(), make_image_filter());
604    }
605        break;
606    case OFFSET:
607        filter = SkOffsetImageFilter::Create(make_scalar(), make_scalar(), make_image_filter());
608        break;
609    case MATRIX:
610        filter = SkImageFilter::CreateMatrixFilter(make_matrix(),
611                                                   (SkFilterQuality)R(4),
612                                                   make_image_filter());
613        break;
614    case MATRIX_CONVOLUTION:
615    {
616        SkImageFilter::CropRect cropR(SkRect::MakeWH(SkIntToScalar(kBitmapSize),
617                                                     SkIntToScalar(kBitmapSize)));
618        SkISize size = SkISize::Make(R(10)+1, R(10)+1);
619        int arraySize = size.width() * size.height();
620        SkTArray<SkScalar> kernel(arraySize);
621        for (int i = 0; i < arraySize; ++i) {
622            kernel.push_back() = make_scalar();
623        }
624        SkIPoint kernelOffset = SkIPoint::Make(R(SkIntToScalar(size.width())),
625                                               R(SkIntToScalar(size.height())));
626        filter = SkMatrixConvolutionImageFilter::Create(size,
627                                                        kernel.begin(),
628                                                        make_scalar(),
629                                                        make_scalar(),
630                                                        kernelOffset,
631                                                        (SkMatrixConvolutionImageFilter::TileMode)R(3),
632                                                        R(2) == 1,
633                                                        make_image_filter(),
634                                                        &cropR);
635    }
636        break;
637    case COMPOSE:
638        filter = SkComposeImageFilter::Create(make_image_filter(), make_image_filter());
639        break;
640    case DISTANT_LIGHT:
641        filter = (R(2) == 1) ?
642                 SkLightingImageFilter::CreateDistantLitDiffuse(make_point(),
643                 make_color(), make_scalar(), make_scalar(), make_image_filter()) :
644                 SkLightingImageFilter::CreateDistantLitSpecular(make_point(),
645                 make_color(), make_scalar(), make_scalar(), SkIntToScalar(R(10)),
646                 make_image_filter());
647        break;
648    case POINT_LIGHT:
649        filter = (R(2) == 1) ?
650                 SkLightingImageFilter::CreatePointLitDiffuse(make_point(),
651                 make_color(), make_scalar(), make_scalar(), make_image_filter()) :
652                 SkLightingImageFilter::CreatePointLitSpecular(make_point(),
653                 make_color(), make_scalar(), make_scalar(), SkIntToScalar(R(10)),
654                 make_image_filter());
655        break;
656    case SPOT_LIGHT:
657        filter = (R(2) == 1) ?
658                 SkLightingImageFilter::CreateSpotLitDiffuse(SkPoint3::Make(0, 0, 0),
659                 make_point(), make_scalar(), make_scalar(), make_color(),
660                 make_scalar(), make_scalar(), make_image_filter()) :
661                 SkLightingImageFilter::CreateSpotLitSpecular(SkPoint3::Make(0, 0, 0),
662                 make_point(), make_scalar(), make_scalar(), make_color(),
663                 make_scalar(), make_scalar(), SkIntToScalar(R(10)), make_image_filter());
664        break;
665    case NOISE:
666    {
667        SkAutoTUnref<SkShader> shader((R(2) == 1) ?
668            SkPerlinNoiseShader::CreateFractalNoise(
669                make_scalar(true), make_scalar(true), R(10.0f), make_scalar()) :
670            SkPerlinNoiseShader::CreateTurbulence(
671                make_scalar(true), make_scalar(true), R(10.0f), make_scalar()));
672        SkPaint paint;
673        paint.setShader(shader);
674        SkImageFilter::CropRect cropR(SkRect::MakeWH(SkIntToScalar(kBitmapSize),
675                                                     SkIntToScalar(kBitmapSize)));
676        filter = SkPaintImageFilter::Create(paint, &cropR);
677    }
678        break;
679    case DROP_SHADOW:
680        filter = SkDropShadowImageFilter::Create(make_scalar(), make_scalar(), make_scalar(true),
681                    make_scalar(true), make_color(), make_shadow_mode(), make_image_filter(),
682                    nullptr);
683        break;
684    case MORPHOLOGY:
685        if (R(2) == 1) {
686            filter = SkDilateImageFilter::Create(R(static_cast<float>(kBitmapSize)),
687                R(static_cast<float>(kBitmapSize)), make_image_filter());
688        } else {
689            filter = SkErodeImageFilter::Create(R(static_cast<float>(kBitmapSize)),
690                R(static_cast<float>(kBitmapSize)), make_image_filter());
691        }
692        break;
693    case BITMAP:
694    {
695        SkAutoTUnref<SkImage> image(SkImage::NewFromBitmap(make_bitmap()));
696        if (R(2) == 1) {
697            filter = SkImageSource::Create(image, make_rect(), make_rect(), kHigh_SkFilterQuality);
698        } else {
699            filter = SkImageSource::Create(image);
700        }
701    }
702        break;
703    case DISPLACE:
704        filter = SkDisplacementMapEffect::Create(make_channel_selector_type(),
705                                                 make_channel_selector_type(), make_scalar(),
706                                                 make_image_filter(false), make_image_filter());
707        break;
708    case TILE:
709        filter = SkTileImageFilter::Create(make_rect(), make_rect(), make_image_filter(false));
710        break;
711    case PICTURE:
712    {
713        SkRTreeFactory factory;
714        SkPictureRecorder recorder;
715        SkCanvas* recordingCanvas = recorder.beginRecording(SkIntToScalar(kBitmapSize),
716                                                            SkIntToScalar(kBitmapSize),
717                                                            &factory, 0);
718        drawSomething(recordingCanvas);
719        SkAutoTUnref<SkPicture> pict(recorder.endRecording());
720        filter = SkPictureImageFilter::Create(pict.get(), make_rect());
721    }
722        break;
723    case PAINT:
724    {
725        SkImageFilter::CropRect cropR(make_rect());
726        filter = SkPaintImageFilter::Create(make_paint(), &cropR);
727    }
728    default:
729        break;
730    }
731    return (filter || canBeNull) ? filter : make_image_filter(canBeNull);
732}
733
734static SkImageFilter* make_serialized_image_filter() {
735    SkAutoTUnref<SkImageFilter> filter(make_image_filter(false));
736    SkAutoTUnref<SkData> data(SkValidatingSerializeFlattenable(filter));
737    const unsigned char* ptr = static_cast<const unsigned char*>(data->data());
738    size_t len = data->size();
739#ifdef SK_ADD_RANDOM_BIT_FLIPS
740    unsigned char* p = const_cast<unsigned char*>(ptr);
741    for (size_t i = 0; i < len; ++i, ++p) {
742        if (R(250) == 1) { // 0.4% of the time, flip a bit or byte
743            if (R(10) == 1) { // Then 10% of the time, change a whole byte
744                switch(R(3)) {
745                case 0:
746                    *p ^= 0xFF; // Flip entire byte
747                    break;
748                case 1:
749                    *p = 0xFF; // Set all bits to 1
750                    break;
751                case 2:
752                    *p = 0x00; // Set all bits to 0
753                    break;
754                }
755            } else {
756                *p ^= (1 << R(8));
757            }
758        }
759    }
760#endif // SK_ADD_RANDOM_BIT_FLIPS
761    SkFlattenable* flattenable = SkValidatingDeserializeFlattenable(ptr, len,
762                                    SkImageFilter::GetFlattenableType());
763    return static_cast<SkImageFilter*>(flattenable);
764}
765
766static void drawClippedBitmap(SkCanvas* canvas, int x, int y, const SkPaint& paint) {
767    canvas->save();
768    canvas->clipRect(SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
769        SkIntToScalar(kBitmapSize), SkIntToScalar(kBitmapSize)));
770    canvas->drawBitmap(make_bitmap(), SkIntToScalar(x), SkIntToScalar(y), &paint);
771    canvas->restore();
772}
773
774static void do_fuzz(SkCanvas* canvas) {
775    SkImageFilter* filter = make_serialized_image_filter();
776
777#ifdef SK_FUZZER_IS_VERBOSE
778    static uint32_t numFilters = 0;
779    static uint32_t numValidFilters = 0;
780    if (0 == numFilters) {
781        printf("Fuzzing with %u\n", kSeed);
782    }
783    numFilters++;
784    if (filter) {
785        numValidFilters++;
786    }
787    printf("Filter no : %u. Valid filters so far : %u\r", numFilters, numValidFilters);
788    fflush(stdout);
789#endif
790
791    SkPaint paint;
792    SkSafeUnref(paint.setImageFilter(filter));
793    drawClippedBitmap(canvas, 0, 0, paint);
794}
795
796//////////////////////////////////////////////////////////////////////////////
797
798class ImageFilterFuzzView : public SampleView {
799public:
800    ImageFilterFuzzView() {
801        this->setBGColor(0xFFDDDDDD);
802    }
803
804protected:
805    // overrides from SkEventSink
806    virtual bool onQuery(SkEvent* evt) {
807        if (SampleCode::TitleQ(*evt)) {
808            SampleCode::TitleR(evt, "ImageFilterFuzzer");
809            return true;
810        }
811        return this->INHERITED::onQuery(evt);
812    }
813
814    void drawBG(SkCanvas* canvas) {
815        canvas->drawColor(0xFFDDDDDD);
816    }
817
818    virtual void onDrawContent(SkCanvas* canvas) {
819        do_fuzz(canvas);
820        this->inval(0);
821    }
822
823private:
824    typedef SkView INHERITED;
825};
826
827//////////////////////////////////////////////////////////////////////////////
828
829static SkView* MyFactory() { return new ImageFilterFuzzView; }
830static SkViewRegister reg(MyFactory);
831