aboutsummaryrefslogtreecommitdiffhomepage
path: root/tests/BlurTest.cpp
blob: f5bb215065dba8b25902719ba57ea43a4f18b656 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "SkBlurMask.h"
#include "SkBlurMaskFilter.h"
#include "SkBlurDrawLooper.h"
#include "SkCanvas.h"
#include "SkEmbossMaskFilter.h"
#include "SkLayerDrawLooper.h"
#include "SkMath.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "Test.h"

#if SK_SUPPORT_GPU
#include "GrContextFactory.h"
#include "SkGpuDevice.h"
#endif

#define WRITE_CSV 0

///////////////////////////////////////////////////////////////////////////////

#define ILLEGAL_MODE    ((SkXfermode::Mode)-1)

static const int outset = 100;
static const SkColor bgColor = SK_ColorWHITE;
static const int strokeWidth = 4;

static void create(SkBitmap* bm, const SkIRect& bound) {
    bm->allocN32Pixels(bound.width(), bound.height());
}

static void drawBG(SkCanvas* canvas) {
    canvas->drawColor(bgColor);
}


struct BlurTest {
    void (*addPath)(SkPath*);
    int viewLen;
    SkIRect views[9];
};

//Path Draw Procs
//Beware that paths themselves my draw differently depending on the clip.
static void draw50x50Rect(SkPath* path) {
    path->addRect(0, 0, SkIntToScalar(50), SkIntToScalar(50));
}

//Tests
static BlurTest tests[] = {
    { draw50x50Rect, 3, {
        //inner half of blur
        { 0, 0, 50, 50 },
        //blur, but no path.
        { 50 + strokeWidth/2, 50 + strokeWidth/2, 100, 100 },
        //just an edge
        { 40, strokeWidth, 60, 50 - strokeWidth },
    }},
};

/** Assumes that the ref draw was completely inside ref canvas --
    implies that everything outside is "bgColor".
    Checks that all overlap is the same and that all non-overlap on the
    ref is "bgColor".
 */
static bool compare(const SkBitmap& ref, const SkIRect& iref,
                    const SkBitmap& test, const SkIRect& itest)
{
    const int xOff = itest.fLeft - iref.fLeft;
    const int yOff = itest.fTop - iref.fTop;

    SkAutoLockPixels alpRef(ref);
    SkAutoLockPixels alpTest(test);

    for (int y = 0; y < test.height(); ++y) {
        for (int x = 0; x < test.width(); ++x) {
            SkColor testColor = test.getColor(x, y);
            int refX = x + xOff;
            int refY = y + yOff;
            SkColor refColor;
            if (refX >= 0 && refX < ref.width() &&
                refY >= 0 && refY < ref.height())
            {
                refColor = ref.getColor(refX, refY);
            } else {
                refColor = bgColor;
            }
            if (refColor != testColor) {
                return false;
            }
        }
    }
    return true;
}

DEF_TEST(BlurDrawing, reporter) {
    SkPaint paint;
    paint.setColor(SK_ColorGRAY);
    paint.setStyle(SkPaint::kStroke_Style);
    paint.setStrokeWidth(SkIntToScalar(strokeWidth));

    SkScalar sigma = SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(5));
    for (int style = 0; style <= kLastEnum_SkBlurStyle; ++style) {
        SkBlurStyle blurStyle = static_cast<SkBlurStyle>(style);

        const uint32_t flagPermutations = SkBlurMaskFilter::kAll_BlurFlag;
        for (uint32_t flags = 0; flags < flagPermutations; ++flags) {
            SkMaskFilter* filter;
            filter = SkBlurMaskFilter::Create(blurStyle, sigma, flags);

            paint.setMaskFilter(filter);
            filter->unref();

            for (size_t test = 0; test < SK_ARRAY_COUNT(tests); ++test) {
                SkPath path;
                tests[test].addPath(&path);
                SkPath strokedPath;
                paint.getFillPath(path, &strokedPath);
                SkRect refBound = strokedPath.getBounds();
                SkIRect iref;
                refBound.roundOut(&iref);
                iref.inset(-outset, -outset);
                SkBitmap refBitmap;
                create(&refBitmap, iref);

                SkCanvas refCanvas(refBitmap);
                refCanvas.translate(SkIntToScalar(-iref.fLeft),
                                    SkIntToScalar(-iref.fTop));
                drawBG(&refCanvas);
                refCanvas.drawPath(path, paint);

                for (int view = 0; view < tests[test].viewLen; ++view) {
                    SkIRect itest = tests[test].views[view];
                    SkBitmap testBitmap;
                    create(&testBitmap, itest);

                    SkCanvas testCanvas(testBitmap);
                    testCanvas.translate(SkIntToScalar(-itest.fLeft),
                                         SkIntToScalar(-itest.fTop));
                    drawBG(&testCanvas);
                    testCanvas.drawPath(path, paint);

                    REPORTER_ASSERT(reporter,
                        compare(refBitmap, iref, testBitmap, itest));
                }
            }
        }
    }
}

///////////////////////////////////////////////////////////////////////////////

// Use SkBlurMask::BlurGroundTruth to blur a 'width' x 'height' solid
// white rect. Return the right half of the middle row in 'result'.
static void ground_truth_2d(int width, int height,
                            SkScalar sigma,
                            int* result, int resultCount) {
    SkMask src, dst;

    src.fBounds.set(0, 0, width, height);
    src.fFormat = SkMask::kA8_Format;
    src.fRowBytes = src.fBounds.width();
    src.fImage = SkMask::AllocImage(src.computeTotalImageSize());

    memset(src.fImage, 0xff, src.computeTotalImageSize());

    dst.fImage = nullptr;
    SkBlurMask::BlurGroundTruth(sigma, &dst, src, kNormal_SkBlurStyle);

    int midX = dst.fBounds.centerX();
    int midY = dst.fBounds.centerY();
    uint8_t* bytes = dst.getAddr8(midX, midY);
    int i;
    for (i = 0; i < dst.fBounds.width()-(midX-dst.fBounds.fLeft); ++i) {
        if (i < resultCount) {
            result[i] = bytes[i];
        }
    }
    for ( ; i < resultCount; ++i) {
        result[i] = 0;
    }

    SkMask::FreeImage(src.fImage);
    SkMask::FreeImage(dst.fImage);
}

// Implement a step function that is 255 between min and max; 0 elsewhere.
static int step(int x, SkScalar min, SkScalar max) {
    if (min < x && x < max) {
        return 255;
    }
    return 0;
}

// Implement a Gaussian function with 0 mean and std.dev. of 'sigma'.
static float gaussian(int x, SkScalar sigma) {
    float k = SK_Scalar1/(sigma * sqrtf(2.0f*SK_ScalarPI));
    float exponent = -(x * x) / (2 * sigma * sigma);
    return k * expf(exponent);
}

// Perform a brute force convolution of a step function with a Gaussian.
// Return the right half in 'result'
static void brute_force_1d(SkScalar stepMin, SkScalar stepMax,
                           SkScalar gaussianSigma,
                           int* result, int resultCount) {

    int gaussianRange = SkScalarCeilToInt(10 * gaussianSigma);

    for (int i = 0; i < resultCount; ++i) {
        SkScalar sum = 0.0f;
        for (int j = -gaussianRange; j < gaussianRange; ++j) {
            sum += gaussian(j, gaussianSigma) * step(i-j, stepMin, stepMax);
        }

        result[i] = SkClampMax(SkClampPos(int(sum + 0.5f)), 255);
    }
}

static void blur_path(SkCanvas* canvas, const SkPath& path,
                      SkScalar gaussianSigma) {

    SkScalar midX = path.getBounds().centerX();
    SkScalar midY = path.getBounds().centerY();

    canvas->translate(-midX, -midY);

    SkPaint blurPaint;
    blurPaint.setColor(SK_ColorWHITE);
    SkMaskFilter* filter = SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
                                                    gaussianSigma,
                                                    SkBlurMaskFilter::kHighQuality_BlurFlag);
    blurPaint.setMaskFilter(filter)->unref();

    canvas->drawColor(SK_ColorBLACK);
    canvas->drawPath(path, blurPaint);
}

// Readback the blurred draw results from the canvas
static void readback(SkCanvas* canvas, int* result, int resultCount) {
    SkBitmap readback;
    readback.allocN32Pixels(resultCount, 30);

    SkIRect readBackRect = { 0, 0, resultCount, 30 };

    canvas->readPixels(readBackRect, &readback);

    readback.lockPixels();
    SkPMColor* pixels = (SkPMColor*) readback.getAddr32(0, 15);

    for (int i = 0; i < resultCount; ++i) {
        result[i] = SkColorGetR(pixels[i]);
    }
}

// Draw a blurred version of the provided path.
// Return the right half of the middle row in 'result'.
static void cpu_blur_path(const SkPath& path, SkScalar gaussianSigma,
                          int* result, int resultCount) {

    SkBitmap bitmap;
    bitmap.allocN32Pixels(resultCount, 30);
    SkCanvas canvas(bitmap);

    blur_path(&canvas, path, gaussianSigma);
    readback(&canvas, result, resultCount);
}

#if SK_SUPPORT_GPU
#if 0
// temporary disable; see below for explanation
static bool gpu_blur_path(GrContext* context, const SkPath& path,
                          SkScalar gaussianSigma,
                          int* result, int resultCount) {
    GrSurfaceDesc desc;
    desc.fConfig = kSkia8888_GrPixelConfig;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fWidth = resultCount;
    desc.fHeight = 30;
    desc.fSampleCnt = 0;

    SkAutoTUnref<GrTexture> texture(grContext->createTexture(desc, false, nullptr, 0));
    SkAutoTUnref<SkGpuDevice> device(new SkGpuDevice  (grContext, texture.get()));
    SkCanvas canvas(device.get());

    blur_path(&canvas, path, gaussianSigma);
    readback(&canvas, result, resultCount);
    return true;
}
#endif
#endif

#if WRITE_CSV
static void write_as_csv(const char* label, SkScalar scale, int* data, int count) {
    SkDebugf("%s_%.2f,", label, scale);
    for (int i = 0; i < count-1; ++i) {
        SkDebugf("%d,", data[i]);
    }
    SkDebugf("%d\n", data[count-1]);
}
#endif

static bool match(int* first, int* second, int count, int tol) {
    int delta;
    for (int i = 0; i < count; ++i) {
        delta = first[i] - second[i];
        if (delta > tol || delta < -tol) {
            return false;
        }
    }

    return true;
}

// Test out the normal blur style with a wide range of sigmas
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(BlurSigmaRange, reporter, context) {
    static const int kSize = 100;

    // The geometry is offset a smidge to trigger:
    // https://code.google.com/p/chromium/issues/detail?id=282418
    SkPath rectPath;
    rectPath.addRect(0.3f, 0.3f, 100.3f, 100.3f);

    SkPoint polyPts[] = {
        { 0.3f, 0.3f },
        { 100.3f, 0.3f },
        { 100.3f, 100.3f },
        { 0.3f, 100.3f },
        { 2.3f, 50.3f }     // a little divet to throw off the rect special case
    };
    SkPath polyPath;
    polyPath.addPoly(polyPts, SK_ARRAY_COUNT(polyPts), true);

    int rectSpecialCaseResult[kSize];
    int generalCaseResult[kSize];
    int groundTruthResult[kSize];
    int bruteForce1DResult[kSize];

    SkScalar sigma = 10.0f;

    for (int i = 0; i < 4; ++i, sigma /= 10) {

        cpu_blur_path(rectPath, sigma, rectSpecialCaseResult, kSize);
        cpu_blur_path(polyPath, sigma, generalCaseResult, kSize);

        ground_truth_2d(100, 100, sigma, groundTruthResult, kSize);
        brute_force_1d(-50.0f, 50.0f, sigma, bruteForce1DResult, kSize);

        REPORTER_ASSERT(reporter, match(rectSpecialCaseResult, bruteForce1DResult, kSize, 5));
        REPORTER_ASSERT(reporter, match(generalCaseResult, bruteForce1DResult, kSize, 15));
#if SK_SUPPORT_GPU
#if 0
        int gpuResult[kSize];
        bool haveGPUResult = gpu_blur_path(context, rectPath, sigma, gpuResult, kSize);
        // Disabling this test for now -- I don't think it's a legit comparison.
        // Will continue to investigate this.
        if (haveGPUResult) {
            // 1 works everywhere but: Ubuntu13 & Nexus4
            REPORTER_ASSERT(reporter, match(gpuResult, bruteForce1DResult, kSize, 10));
        }
#endif
#endif
        REPORTER_ASSERT(reporter, match(groundTruthResult, bruteForce1DResult, kSize, 1));

#if WRITE_CSV
        write_as_csv("RectSpecialCase", sigma, rectSpecialCaseResult, kSize);
        write_as_csv("GeneralCase", sigma, generalCaseResult, kSize);
#if SK_SUPPORT_GPU
        write_as_csv("GPU", sigma, gpuResult, kSize);
#endif
        write_as_csv("GroundTruth2D", sigma, groundTruthResult, kSize);
        write_as_csv("BruteForce1D", sigma, bruteForce1DResult, kSize);
#endif
    }
}

///////////////////////////////////////////////////////////////////////////////////////////

static SkBlurQuality blurMaskFilterFlags_as_quality(uint32_t blurMaskFilterFlags) {
    return (blurMaskFilterFlags & SkBlurMaskFilter::kHighQuality_BlurFlag) ?
            kHigh_SkBlurQuality : kLow_SkBlurQuality;
}

static uint32_t blurMaskFilterFlags_to_blurDrawLooperFlags(uint32_t bmf) {
    const struct {
        uint32_t fBlurMaskFilterFlag;
        uint32_t fBlurDrawLooperFlag;
    } pairs[] = {
        { SkBlurMaskFilter::kIgnoreTransform_BlurFlag, SkBlurDrawLooper::kIgnoreTransform_BlurFlag },
        { SkBlurMaskFilter::kHighQuality_BlurFlag,     SkBlurDrawLooper::kHighQuality_BlurFlag },
    };

    uint32_t bdl = 0;
    for (size_t i = 0; i < SK_ARRAY_COUNT(pairs); ++i) {
        if (bmf & pairs[i].fBlurMaskFilterFlag) {
            bdl |= pairs[i].fBlurDrawLooperFlag;
        }
    }
    return bdl;
}

static void test_blurDrawLooper(skiatest::Reporter* reporter, SkScalar sigma,
                                SkBlurStyle style, uint32_t blurMaskFilterFlags) {
    if (kNormal_SkBlurStyle != style) {
        return; // blurdrawlooper only supports normal
    }

    const SkColor color = 0xFF335577;
    const SkScalar dx = 10;
    const SkScalar dy = -5;
    const SkBlurQuality quality = blurMaskFilterFlags_as_quality(blurMaskFilterFlags);
    uint32_t flags = blurMaskFilterFlags_to_blurDrawLooperFlags(blurMaskFilterFlags);

    SkAutoTUnref<SkDrawLooper> lp(SkBlurDrawLooper::Create(color, sigma, dx, dy, flags));

    const bool expectSuccess = sigma > 0 &&
                               0 == (flags & SkBlurDrawLooper::kIgnoreTransform_BlurFlag);

    if (nullptr == lp.get()) {
        REPORTER_ASSERT(reporter, sigma <= 0);
    } else {
        SkDrawLooper::BlurShadowRec rec;
        bool success = lp->asABlurShadow(&rec);
        REPORTER_ASSERT(reporter, success == expectSuccess);
        if (success) {
            REPORTER_ASSERT(reporter, rec.fSigma == sigma);
            REPORTER_ASSERT(reporter, rec.fOffset.x() == dx);
            REPORTER_ASSERT(reporter, rec.fOffset.y() == dy);
            REPORTER_ASSERT(reporter, rec.fColor == color);
            REPORTER_ASSERT(reporter, rec.fStyle == style);
            REPORTER_ASSERT(reporter, rec.fQuality == quality);
        }
    }
}

static void test_delete_looper(skiatest::Reporter* reporter, SkDrawLooper* lp, SkScalar sigma,
                               SkBlurStyle style, SkBlurQuality quality, bool expectSuccess) {
    SkDrawLooper::BlurShadowRec rec;
    bool success = lp->asABlurShadow(&rec);
    REPORTER_ASSERT(reporter, success == expectSuccess);
    if (success != expectSuccess) {
        lp->asABlurShadow(&rec);
    }
    if (success) {
        REPORTER_ASSERT(reporter, rec.fSigma == sigma);
        REPORTER_ASSERT(reporter, rec.fStyle == style);
        REPORTER_ASSERT(reporter, rec.fQuality == quality);
    }
    lp->unref();
}

static void make_noop_layer(SkLayerDrawLooper::Builder* builder) {
    SkLayerDrawLooper::LayerInfo info;

    info.fPaintBits = 0;
    info.fColorMode = SkXfermode::kDst_Mode;
    builder->addLayer(info);
}

static void make_blur_layer(SkLayerDrawLooper::Builder* builder, SkMaskFilter* mf) {
    SkLayerDrawLooper::LayerInfo info;

    info.fPaintBits = SkLayerDrawLooper::kMaskFilter_Bit;
    info.fColorMode = SkXfermode::kSrc_Mode;
    SkPaint* paint = builder->addLayer(info);
    paint->setMaskFilter(mf);
}

static void test_layerDrawLooper(skiatest::Reporter* reporter, SkMaskFilter* mf, SkScalar sigma,
                                 SkBlurStyle style, SkBlurQuality quality, bool expectSuccess) {

    SkLayerDrawLooper::LayerInfo info;
    SkLayerDrawLooper::Builder builder;

    // 1 layer is too few
    make_noop_layer(&builder);
    test_delete_looper(reporter, builder.detachLooper(), sigma, style, quality, false);

    // 2 layers is good, but need blur
    make_noop_layer(&builder);
    make_noop_layer(&builder);
    test_delete_looper(reporter, builder.detachLooper(), sigma, style, quality, false);

    // 2 layers is just right
    make_noop_layer(&builder);
    make_blur_layer(&builder, mf);
    test_delete_looper(reporter, builder.detachLooper(), sigma, style, quality, expectSuccess);

    // 3 layers is too many
    make_noop_layer(&builder);
    make_blur_layer(&builder, mf);
    make_noop_layer(&builder);
    test_delete_looper(reporter, builder.detachLooper(), sigma, style, quality, false);
}

DEF_TEST(BlurAsABlur, reporter) {
    const SkBlurStyle styles[] = {
        kNormal_SkBlurStyle, kSolid_SkBlurStyle, kOuter_SkBlurStyle, kInner_SkBlurStyle
    };
    const SkScalar sigmas[] = {
        // values <= 0 should not success for a blur
        -1, 0, 0.5f, 2
    };

    // Test asABlur for SkBlurMaskFilter
    //
    for (size_t i = 0; i < SK_ARRAY_COUNT(styles); ++i) {
        const SkBlurStyle style = (SkBlurStyle)styles[i];
        for (size_t j = 0; j < SK_ARRAY_COUNT(sigmas); ++j) {
            const SkScalar sigma = sigmas[j];
            for (int flags = 0; flags <= SkBlurMaskFilter::kAll_BlurFlag; ++flags) {
                const SkBlurQuality quality = blurMaskFilterFlags_as_quality(flags);

                SkAutoTUnref<SkMaskFilter> mf(SkBlurMaskFilter::Create(style, sigma, flags));
                if (nullptr == mf.get()) {
                    REPORTER_ASSERT(reporter, sigma <= 0);
                } else {
                    REPORTER_ASSERT(reporter, sigma > 0);
                    SkMaskFilter::BlurRec rec;
                    bool success = mf->asABlur(&rec);
                    if (flags & SkBlurMaskFilter::kIgnoreTransform_BlurFlag) {
                        REPORTER_ASSERT(reporter, !success);
                    } else {
                        REPORTER_ASSERT(reporter, success);
                        REPORTER_ASSERT(reporter, rec.fSigma == sigma);
                        REPORTER_ASSERT(reporter, rec.fStyle == style);
                        REPORTER_ASSERT(reporter, rec.fQuality == quality);
                    }
                    test_layerDrawLooper(reporter, mf, sigma, style, quality, success);
                }
                test_blurDrawLooper(reporter, sigma, style, flags);
            }
        }
    }

    // Test asABlur for SkEmbossMaskFilter -- should never succeed
    //
    {
        SkEmbossMaskFilter::Light light = {
            { 1, 1, 1 }, 0, 127, 127
        };
        for (size_t j = 0; j < SK_ARRAY_COUNT(sigmas); ++j) {
            const SkScalar sigma = sigmas[j];
            SkAutoTUnref<SkMaskFilter> mf(SkEmbossMaskFilter::Create(sigma, light));
            if (mf.get()) {
                SkMaskFilter::BlurRec rec;
                bool success = mf->asABlur(&rec);
                REPORTER_ASSERT(reporter, !success);
            }
        }
    }
}

///////////////////////////////////////////////////////////////////////////////////////////