aboutsummaryrefslogtreecommitdiffhomepage
path: root/tests/DrawBitmapRectTest.cpp
blob: 2eb181960b36aacda4ceb2c8081c67be72ae2366 (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
/*
 * 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 "SkBitmap.h"
#include "SkCanvas.h"
#include "SkData.h"
#include "SkDiscardableMemoryPool.h"
#include "SkImageGeneratorPriv.h"
#include "SkMatrixUtils.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkPixelRef.h"
#include "SkRandom.h"
#include "SkShader.h"
#include "SkSurface.h"
#include "Test.h"

class FailurePixelRef : public SkPixelRef {
public:
    FailurePixelRef(const SkImageInfo& info) : SkPixelRef(info) {}
protected:
    bool onNewLockPixels(LockRec*) override { return false; }
    void onUnlockPixels() override {}
};

// crbug.com/295895
// Crashing in skia when a pixelref fails in lockPixels
//
static void test_faulty_pixelref(skiatest::Reporter* reporter) {
    // need a cache, but don't expect to use it, so the budget is not critical
    SkAutoTUnref<SkDiscardableMemoryPool> pool(
        SkDiscardableMemoryPool::Create(10 * 1000, nullptr));

    SkBitmap bm;
    const SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
    bm.setInfo(info);
    bm.setPixelRef(new FailurePixelRef(info), 0, 0)->unref();
    // now our bitmap has a pixelref, but we know it will fail to lock

    SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(200, 200));
    SkCanvas* canvas = surface->getCanvas();

    const SkFilterQuality levels[] = {
        kNone_SkFilterQuality,
        kLow_SkFilterQuality,
        kMedium_SkFilterQuality,
        kHigh_SkFilterQuality,
    };

    SkPaint paint;
    canvas->scale(2, 2);    // need a scale, otherwise we may ignore filtering
    for (size_t i = 0; i < SK_ARRAY_COUNT(levels); ++i) {
        paint.setFilterQuality(levels[i]);
        canvas->drawBitmap(bm, 0, 0, &paint);
    }
}

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

static void rand_matrix(SkMatrix* mat, SkRandom& rand, unsigned mask) {
    mat->setIdentity();
    if (mask & SkMatrix::kTranslate_Mask) {
        mat->postTranslate(rand.nextSScalar1(), rand.nextSScalar1());
    }
    if (mask & SkMatrix::kScale_Mask) {
        mat->postScale(rand.nextSScalar1(), rand.nextSScalar1());
    }
    if (mask & SkMatrix::kAffine_Mask) {
        mat->postRotate(rand.nextSScalar1() * 360);
    }
    if (mask & SkMatrix::kPerspective_Mask) {
        mat->setPerspX(rand.nextSScalar1());
        mat->setPerspY(rand.nextSScalar1());
    }
}

static void rand_size(SkISize* size, SkRandom& rand) {
    size->set(rand.nextU() & 0xFFFF, rand.nextU() & 0xFFFF);
}

static bool treat_as_sprite(const SkMatrix& mat, const SkISize& size,
                            unsigned bits) {
    return SkTreatAsSprite(mat, size.width(), size.height(), bits);
}

static void test_treatAsSprite(skiatest::Reporter* reporter) {
    const unsigned bilerBits = kSkSubPixelBitsForBilerp;

    SkMatrix mat;
    SkISize  size;
    SkRandom rand;

    // assert: translate-only no-filter can always be treated as sprite
    for (int i = 0; i < 1000; ++i) {
        rand_matrix(&mat, rand, SkMatrix::kTranslate_Mask);
        for (int j = 0; j < 1000; ++j) {
            rand_size(&size, rand);
            REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, 0));
        }
    }

    // assert: rotate/perspect is never treated as sprite
    for (int i = 0; i < 1000; ++i) {
        rand_matrix(&mat, rand, SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask);
        for (int j = 0; j < 1000; ++j) {
            rand_size(&size, rand);
            REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, 0));
            REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
        }
    }

    size.set(500, 600);

    const SkScalar tooMuchSubpixel = 100.1f;
    mat.setTranslate(tooMuchSubpixel, 0);
    REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
    mat.setTranslate(0, tooMuchSubpixel);
    REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));

    const SkScalar tinySubPixel = 100.02f;
    mat.setTranslate(tinySubPixel, 0);
    REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));
    mat.setTranslate(0, tinySubPixel);
    REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));

    const SkScalar twoThirds = SK_Scalar1 * 2 / 3;
    const SkScalar bigScale = (size.width() + twoThirds) / size.width();
    mat.setScale(bigScale, bigScale);
    REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, false));
    REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));

    const SkScalar oneThird = SK_Scalar1 / 3;
    const SkScalar smallScale = (size.width() + oneThird) / size.width();
    mat.setScale(smallScale, smallScale);
    REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, false));
    REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));

    const SkScalar oneFortyth = SK_Scalar1 / 40;
    const SkScalar tinyScale = (size.width() + oneFortyth) / size.width();
    mat.setScale(tinyScale, tinyScale);
    REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, false));
    REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));
}

static void assert_ifDrawnTo(skiatest::Reporter* reporter,
                             const SkBitmap& bm, bool shouldBeDrawn) {
    for (int y = 0; y < bm.height(); ++y) {
        for (int x = 0; x < bm.width(); ++x) {
            if (shouldBeDrawn) {
                if (SK_ColorTRANSPARENT == *bm.getAddr32(x, y)) {
                    REPORTER_ASSERT(reporter, false);
                    return;
                }
            } else {
                // should not be drawn
                if (SK_ColorTRANSPARENT != *bm.getAddr32(x, y)) {
                    REPORTER_ASSERT(reporter, false);
                    return;
                }
            }
        }
    }
}

static void test_wacky_bitmapshader(skiatest::Reporter* reporter,
                                    int width, int height, bool shouldBeDrawn) {
    SkBitmap dev;
    dev.allocN32Pixels(0x56F, 0x4f6);
    dev.eraseColor(SK_ColorTRANSPARENT);  // necessary, so we know if we draw to it

    SkMatrix matrix;

    SkCanvas c(dev);
    matrix.setAll(-119.34097f,
                  -43.436558f,
                  93489.945f,
                  43.436558f,
                  -119.34097f,
                  123.98426f,
                  0, 0, SK_Scalar1);
    c.concat(matrix);

    SkBitmap bm;
    if (bm.tryAllocN32Pixels(width, height)) {
        // allow this to fail silently, to test the code downstream
    }
    bm.eraseColor(SK_ColorRED);

    matrix.setAll(0.0078740157f,
                  0,
                  SkIntToScalar(249),
                  0,
                  0.0078740157f,
                  SkIntToScalar(239),
                  0, 0, SK_Scalar1);
    SkShader* s = SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
                                               SkShader::kRepeat_TileMode, &matrix);

    SkPaint paint;
    paint.setShader(s)->unref();

    SkRect r = SkRect::MakeXYWH(681, 239, 695, 253);
    c.drawRect(r, paint);

    assert_ifDrawnTo(reporter, dev, shouldBeDrawn);
}

/*
 *  Original bug was asserting that the matrix-proc had generated a (Y) value
 *  that was out of range. This led (in the release build) to the sampler-proc
 *  reading memory out-of-bounds of the original bitmap.
 *
 *  We were numerically overflowing our 16bit coordinates that we communicate
 *  between these two procs. The fixes was in two parts:
 *
 *  1. Just don't draw bitmaps larger than 64K-1 in width or height, since we
 *     can't represent those coordinates in our transport format (yet).
 *  2. Perform an unsigned shift during the calculation, so we don't get
 *     sign-extension bleed when packing the two values (X,Y) into our 32bit
 *     slot.
 *
 *  This tests exercises the original setup, plus 3 more to ensure that we can,
 *  in fact, handle bitmaps at 64K-1 (assuming we don't exceed the total
 *  memory allocation limit).
 */
static void test_giantrepeat_crbug118018(skiatest::Reporter* reporter) {
    static const struct {
        int fWidth;
        int fHeight;
        bool fExpectedToDraw;
    } gTests[] = {
        { 0x1b294, 0x7f,  false },   // crbug 118018 (width exceeds 64K)
        { 0xFFFF, 0x7f,    true },   // should draw, test max width
        { 0x7f, 0xFFFF,    true },   // should draw, test max height
        { 0xFFFF, 0xFFFF, false },   // allocation fails (too much RAM)
    };

    for (size_t i = 0; i < SK_ARRAY_COUNT(gTests); ++i) {
        test_wacky_bitmapshader(reporter,
                                gTests[i].fWidth, gTests[i].fHeight,
                                gTests[i].fExpectedToDraw);
    }
}

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

static void test_nan_antihair() {
    SkBitmap bm;
    bm.allocN32Pixels(20, 20);

    SkCanvas canvas(bm);

    SkPath path;
    path.moveTo(0, 0);
    path.lineTo(10, SK_ScalarNaN);

    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setStyle(SkPaint::kStroke_Style);

    // before our fix to SkScan_Antihair.cpp to check for integral NaN (0x800...)
    // this would trigger an assert/crash.
    //
    // see rev. 3558
    canvas.drawPath(path, paint);
}

static bool check_for_all_zeros(const SkBitmap& bm) {
    SkAutoLockPixels alp(bm);

    size_t count = bm.width() * bm.bytesPerPixel();
    for (int y = 0; y < bm.height(); y++) {
        const uint8_t* ptr = reinterpret_cast<const uint8_t*>(bm.getAddr(0, y));
        for (size_t i = 0; i < count; i++) {
            if (ptr[i]) {
                return false;
            }
        }
    }
    return true;
}

static const int gWidth = 256;
static const int gHeight = 256;

static void create(SkBitmap* bm, SkColor color) {
    bm->allocN32Pixels(gWidth, gHeight);
    bm->eraseColor(color);
}

DEF_TEST(DrawBitmapRect, reporter) {
    SkBitmap src, dst;

    create(&src, 0xFFFFFFFF);
    create(&dst, 0);

    SkCanvas canvas(dst);

    SkIRect srcR = { gWidth, 0, gWidth + 16, 16 };
    SkRect  dstR = { 0, 0, SkIntToScalar(16), SkIntToScalar(16) };

    canvas.drawBitmapRect(src, srcR, dstR, nullptr);

    // ensure that we draw nothing if srcR does not intersect the bitmap
    REPORTER_ASSERT(reporter, check_for_all_zeros(dst));

    test_nan_antihair();
    test_giantrepeat_crbug118018(reporter);

    test_treatAsSprite(reporter);
    test_faulty_pixelref(reporter);
}