1/*
2 * Copyright 2011 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
8#include "SkBitmap.h"
9#include "SkRect.h"
10#include "Test.h"
11
12static const char* boolStr(bool value) {
13    return value ? "true" : "false";
14}
15
16// these are in the same order as the SkColorType enum
17static const char* gColorTypeName[] = {
18    "None", "A8", "565", "4444", "RGBA", "BGRA", "Index8"
19};
20
21static void report_opaqueness(skiatest::Reporter* reporter, const SkBitmap& src,
22                              const SkBitmap& dst) {
23    ERRORF(reporter, "src %s opaque:%d, dst %s opaque:%d",
24           gColorTypeName[src.colorType()], src.isOpaque(),
25           gColorTypeName[dst.colorType()], dst.isOpaque());
26}
27
28static bool canHaveAlpha(SkColorType ct) {
29    return kRGB_565_SkColorType != ct;
30}
31
32// copyTo() should preserve isOpaque when it makes sense
33static void test_isOpaque(skiatest::Reporter* reporter,
34                          const SkBitmap& srcOpaque, const SkBitmap& srcPremul,
35                          SkColorType dstColorType) {
36    SkBitmap dst;
37
38    if (canHaveAlpha(srcPremul.colorType()) && canHaveAlpha(dstColorType)) {
39        REPORTER_ASSERT(reporter, srcPremul.copyTo(&dst, dstColorType));
40        REPORTER_ASSERT(reporter, dst.colorType() == dstColorType);
41        if (srcPremul.isOpaque() != dst.isOpaque()) {
42            report_opaqueness(reporter, srcPremul, dst);
43        }
44    }
45
46    REPORTER_ASSERT(reporter, srcOpaque.copyTo(&dst, dstColorType));
47    REPORTER_ASSERT(reporter, dst.colorType() == dstColorType);
48    if (srcOpaque.isOpaque() != dst.isOpaque()) {
49        report_opaqueness(reporter, srcOpaque, dst);
50    }
51}
52
53static void init_src(const SkBitmap& bitmap) {
54    SkAutoLockPixels lock(bitmap);
55    if (bitmap.getPixels()) {
56        if (bitmap.getColorTable()) {
57            sk_bzero(bitmap.getPixels(), bitmap.getSize());
58        } else {
59            bitmap.eraseColor(SK_ColorWHITE);
60        }
61    }
62}
63
64static SkColorTable* init_ctable(SkAlphaType alphaType) {
65    static const SkColor colors[] = {
66        SK_ColorBLACK, SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE
67    };
68    return new SkColorTable(colors, SK_ARRAY_COUNT(colors), alphaType);
69}
70
71struct Pair {
72    SkColorType fColorType;
73    const char* fValid;
74};
75
76// Utility functions for copyPixelsTo()/copyPixelsFrom() tests.
77// getPixel()
78// setPixel()
79// getSkConfigName()
80// struct Coordinates
81// reportCopyVerification()
82// writeCoordPixels()
83
84// Utility function to read the value of a given pixel in bm. All
85// values converted to uint32_t for simplification of comparisons.
86static uint32_t getPixel(int x, int y, const SkBitmap& bm) {
87    uint32_t val = 0;
88    uint16_t val16;
89    uint8_t val8;
90    SkAutoLockPixels lock(bm);
91    const void* rawAddr = bm.getAddr(x,y);
92
93    switch (bm.bytesPerPixel()) {
94        case 4:
95            memcpy(&val, rawAddr, sizeof(uint32_t));
96            break;
97        case 2:
98            memcpy(&val16, rawAddr, sizeof(uint16_t));
99            val = val16;
100            break;
101        case 1:
102            memcpy(&val8, rawAddr, sizeof(uint8_t));
103            val = val8;
104            break;
105        default:
106            break;
107    }
108    return val;
109}
110
111// Utility function to set value of any pixel in bm.
112// bm.getConfig() specifies what format 'val' must be
113// converted to, but at present uint32_t can handle all formats.
114static void setPixel(int x, int y, uint32_t val, SkBitmap& bm) {
115    uint16_t val16;
116    uint8_t val8;
117    SkAutoLockPixels lock(bm);
118    void* rawAddr = bm.getAddr(x,y);
119
120    switch (bm.bytesPerPixel()) {
121        case 4:
122            memcpy(rawAddr, &val, sizeof(uint32_t));
123            break;
124        case 2:
125            val16 = val & 0xFFFF;
126            memcpy(rawAddr, &val16, sizeof(uint16_t));
127            break;
128        case 1:
129            val8 = val & 0xFF;
130            memcpy(rawAddr, &val8, sizeof(uint8_t));
131            break;
132        default:
133            // Ignore.
134            break;
135    }
136}
137
138// Helper struct to contain pixel locations, while avoiding need for STL.
139struct Coordinates {
140
141    const int length;
142    SkIPoint* const data;
143
144    explicit Coordinates(int _length): length(_length)
145                                     , data(new SkIPoint[length]) { }
146
147    ~Coordinates(){
148        delete [] data;
149    }
150
151    SkIPoint* operator[](int i) const {
152        // Use with care, no bounds checking.
153        return data + i;
154    }
155};
156
157// A function to verify that two bitmaps contain the same pixel values
158// at all coordinates indicated by coords. Simplifies verification of
159// copied bitmaps.
160static void reportCopyVerification(const SkBitmap& bm1, const SkBitmap& bm2,
161                            Coordinates& coords,
162                            const char* msg,
163                            skiatest::Reporter* reporter){
164    bool success = true;
165
166    // Confirm all pixels in the list match.
167    for (int i = 0; i < coords.length; ++i) {
168        success = success &&
169                  (getPixel(coords[i]->fX, coords[i]->fY, bm1) ==
170                   getPixel(coords[i]->fX, coords[i]->fY, bm2));
171    }
172
173    if (!success) {
174        ERRORF(reporter, "%s [colortype = %s]", msg,
175               gColorTypeName[bm1.colorType()]);
176    }
177}
178
179// Writes unique pixel values at locations specified by coords.
180static void writeCoordPixels(SkBitmap& bm, const Coordinates& coords) {
181    for (int i = 0; i < coords.length; ++i)
182        setPixel(coords[i]->fX, coords[i]->fY, i, bm);
183}
184
185static const Pair gPairs[] = {
186    { kUnknown_SkColorType,     "000000"  },
187    { kAlpha_8_SkColorType,     "010101"  },
188    { kIndex_8_SkColorType,     "011111"  },
189    { kRGB_565_SkColorType,     "010101"  },
190    { kARGB_4444_SkColorType,   "010111"  },
191    { kN32_SkColorType,         "010111"  },
192};
193
194static const int W = 20;
195static const int H = 33;
196
197static void setup_src_bitmaps(SkBitmap* srcOpaque, SkBitmap* srcPremul,
198                              SkColorType ct) {
199    SkColorTable* ctOpaque = NULL;
200    SkColorTable* ctPremul = NULL;
201    if (kIndex_8_SkColorType == ct) {
202        ctOpaque = init_ctable(kOpaque_SkAlphaType);
203        ctPremul = init_ctable(kPremul_SkAlphaType);
204    }
205
206    srcOpaque->allocPixels(SkImageInfo::Make(W, H, ct, kOpaque_SkAlphaType),
207                           NULL, ctOpaque);
208    srcPremul->allocPixels(SkImageInfo::Make(W, H, ct, kPremul_SkAlphaType),
209                           NULL, ctPremul);
210    SkSafeUnref(ctOpaque);
211    SkSafeUnref(ctPremul);
212    init_src(*srcOpaque);
213    init_src(*srcPremul);
214}
215
216DEF_TEST(BitmapCopy_extractSubset, reporter) {
217    for (size_t i = 0; i < SK_ARRAY_COUNT(gPairs); i++) {
218        SkBitmap srcOpaque, srcPremul;
219        setup_src_bitmaps(&srcOpaque, &srcPremul, gPairs[i].fColorType);
220
221        SkBitmap bitmap(srcOpaque);
222        SkBitmap subset;
223        SkIRect r;
224        // Extract a subset which has the same width as the original. This
225        // catches a bug where we cloned the genID incorrectly.
226        r.set(0, 1, W, 3);
227        bitmap.setIsVolatile(true);
228        // Relies on old behavior of extractSubset failing if colortype is unknown
229        if (kUnknown_SkColorType != bitmap.colorType() && bitmap.extractSubset(&subset, r)) {
230            REPORTER_ASSERT(reporter, subset.width() == W);
231            REPORTER_ASSERT(reporter, subset.height() == 2);
232            REPORTER_ASSERT(reporter, subset.alphaType() == bitmap.alphaType());
233            REPORTER_ASSERT(reporter, subset.isVolatile() == true);
234
235            // Test copying an extracted subset.
236            for (size_t j = 0; j < SK_ARRAY_COUNT(gPairs); j++) {
237                SkBitmap copy;
238                bool success = subset.copyTo(&copy, gPairs[j].fColorType);
239                if (!success) {
240                    // Skip checking that success matches fValid, which is redundant
241                    // with the code below.
242                    REPORTER_ASSERT(reporter, gPairs[i].fColorType != gPairs[j].fColorType);
243                    continue;
244                }
245
246                // When performing a copy of an extracted subset, the gen id should
247                // change.
248                REPORTER_ASSERT(reporter, copy.getGenerationID() != subset.getGenerationID());
249
250                REPORTER_ASSERT(reporter, copy.width() == W);
251                REPORTER_ASSERT(reporter, copy.height() == 2);
252
253                if (gPairs[i].fColorType == gPairs[j].fColorType) {
254                    SkAutoLockPixels alp0(subset);
255                    SkAutoLockPixels alp1(copy);
256                    // they should both have, or both not-have, a colortable
257                    bool hasCT = subset.getColorTable() != NULL;
258                    REPORTER_ASSERT(reporter, (copy.getColorTable() != NULL) == hasCT);
259                }
260            }
261        }
262
263        bitmap = srcPremul;
264        bitmap.setIsVolatile(false);
265        if (bitmap.extractSubset(&subset, r)) {
266            REPORTER_ASSERT(reporter, subset.alphaType() == bitmap.alphaType());
267            REPORTER_ASSERT(reporter, subset.isVolatile() == false);
268        }
269    }
270}
271
272DEF_TEST(BitmapCopy, reporter) {
273    static const bool isExtracted[] = {
274        false, true
275    };
276
277    for (size_t i = 0; i < SK_ARRAY_COUNT(gPairs); i++) {
278        SkBitmap srcOpaque, srcPremul;
279        setup_src_bitmaps(&srcOpaque, &srcPremul, gPairs[i].fColorType);
280
281        for (size_t j = 0; j < SK_ARRAY_COUNT(gPairs); j++) {
282            SkBitmap dst;
283
284            bool success = srcPremul.copyTo(&dst, gPairs[j].fColorType);
285            bool expected = gPairs[i].fValid[j] != '0';
286            if (success != expected) {
287                ERRORF(reporter, "SkBitmap::copyTo from %s to %s. expected %s "
288                       "returned %s", gColorTypeName[i], gColorTypeName[j],
289                       boolStr(expected), boolStr(success));
290            }
291
292            bool canSucceed = srcPremul.canCopyTo(gPairs[j].fColorType);
293            if (success != canSucceed) {
294                ERRORF(reporter, "SkBitmap::copyTo from %s to %s. returned %s "
295                       "canCopyTo %s", gColorTypeName[i], gColorTypeName[j],
296                       boolStr(success), boolStr(canSucceed));
297            }
298
299            if (success) {
300                REPORTER_ASSERT(reporter, srcPremul.width() == dst.width());
301                REPORTER_ASSERT(reporter, srcPremul.height() == dst.height());
302                REPORTER_ASSERT(reporter, dst.colorType() == gPairs[j].fColorType);
303                test_isOpaque(reporter, srcOpaque, srcPremul, dst.colorType());
304                if (srcPremul.colorType() == dst.colorType()) {
305                    SkAutoLockPixels srcLock(srcPremul);
306                    SkAutoLockPixels dstLock(dst);
307                    REPORTER_ASSERT(reporter, srcPremul.readyToDraw());
308                    REPORTER_ASSERT(reporter, dst.readyToDraw());
309                    const char* srcP = (const char*)srcPremul.getAddr(0, 0);
310                    const char* dstP = (const char*)dst.getAddr(0, 0);
311                    REPORTER_ASSERT(reporter, srcP != dstP);
312                    REPORTER_ASSERT(reporter, !memcmp(srcP, dstP,
313                                                      srcPremul.getSize()));
314                    REPORTER_ASSERT(reporter, srcPremul.getGenerationID() == dst.getGenerationID());
315                } else {
316                    REPORTER_ASSERT(reporter, srcPremul.getGenerationID() != dst.getGenerationID());
317                }
318            } else {
319                // dst should be unchanged from its initial state
320                REPORTER_ASSERT(reporter, dst.colorType() == kUnknown_SkColorType);
321                REPORTER_ASSERT(reporter, dst.width() == 0);
322                REPORTER_ASSERT(reporter, dst.height() == 0);
323            }
324        } // for (size_t j = ...
325
326        // Tests for getSafeSize(), getSafeSize64(), copyPixelsTo(),
327        // copyPixelsFrom().
328        //
329        for (size_t copyCase = 0; copyCase < SK_ARRAY_COUNT(isExtracted);
330             ++copyCase) {
331            // Test copying to/from external buffer.
332            // Note: the tests below have hard-coded values ---
333            //       Please take care if modifying.
334
335            // Tests for getSafeSize64().
336            // Test with a very large configuration without pixel buffer
337            // attached.
338            SkBitmap tstSafeSize;
339            tstSafeSize.setInfo(SkImageInfo::Make(100000000U, 100000000U,
340                                                  gPairs[i].fColorType, kPremul_SkAlphaType));
341            int64_t safeSize = tstSafeSize.computeSafeSize64();
342            if (safeSize < 0) {
343                ERRORF(reporter, "getSafeSize64() negative: %s",
344                       gColorTypeName[tstSafeSize.colorType()]);
345            }
346            bool sizeFail = false;
347            // Compare against hand-computed values.
348            switch (gPairs[i].fColorType) {
349                case kUnknown_SkColorType:
350                    break;
351
352                case kAlpha_8_SkColorType:
353                case kIndex_8_SkColorType:
354                    if (safeSize != 0x2386F26FC10000LL) {
355                        sizeFail = true;
356                    }
357                    break;
358
359                case kRGB_565_SkColorType:
360                case kARGB_4444_SkColorType:
361                    if (safeSize != 0x470DE4DF820000LL) {
362                        sizeFail = true;
363                    }
364                    break;
365
366                case kN32_SkColorType:
367                    if (safeSize != 0x8E1BC9BF040000LL) {
368                        sizeFail = true;
369                    }
370                    break;
371
372                default:
373                    break;
374            }
375            if (sizeFail) {
376                ERRORF(reporter, "computeSafeSize64() wrong size: %s",
377                       gColorTypeName[tstSafeSize.colorType()]);
378            }
379
380            int subW = 2;
381            int subH = 2;
382
383            // Create bitmap to act as source for copies and subsets.
384            SkBitmap src, subset;
385            SkColorTable* ct = NULL;
386            if (kIndex_8_SkColorType == src.colorType()) {
387                ct = init_ctable(kPremul_SkAlphaType);
388            }
389
390            int localSubW;
391            if (isExtracted[copyCase]) { // A larger image to extract from.
392                localSubW = 2 * subW + 1;
393            } else { // Tests expect a 2x2 bitmap, so make smaller.
394                localSubW = subW;
395            }
396            // could fail if we pass kIndex_8 for the colortype
397            if (src.tryAllocPixels(SkImageInfo::Make(localSubW, subH, gPairs[i].fColorType,
398                                                     kPremul_SkAlphaType))) {
399                // failure is fine, as we will notice later on
400            }
401            SkSafeUnref(ct);
402
403            // Either copy src or extract into 'subset', which is used
404            // for subsequent calls to copyPixelsTo/From.
405            bool srcReady = false;
406            // Test relies on older behavior that extractSubset will fail on
407            // kUnknown_SkColorType
408            if (kUnknown_SkColorType != src.colorType() &&
409                isExtracted[copyCase]) {
410                // The extractedSubset() test case allows us to test copy-
411                // ing when src and dst mave possibly different strides.
412                SkIRect r;
413                r.set(1, 0, 1 + subW, subH); // 2x2 extracted bitmap
414
415                srcReady = src.extractSubset(&subset, r);
416            } else {
417                srcReady = src.copyTo(&subset);
418            }
419
420            // Not all configurations will generate a valid 'subset'.
421            if (srcReady) {
422
423                // Allocate our target buffer 'buf' for all copies.
424                // To simplify verifying correctness of copies attach
425                // buf to a SkBitmap, but copies are done using the
426                // raw buffer pointer.
427                const size_t bufSize = subH *
428                    SkColorTypeMinRowBytes(src.colorType(), subW) * 2;
429                SkAutoMalloc autoBuf (bufSize);
430                uint8_t* buf = static_cast<uint8_t*>(autoBuf.get());
431
432                SkBitmap bufBm; // Attach buf to this bitmap.
433                bool successExpected;
434
435                // Set up values for each pixel being copied.
436                Coordinates coords(subW * subH);
437                for (int x = 0; x < subW; ++x)
438                    for (int y = 0; y < subH; ++y)
439                    {
440                        int index = y * subW + x;
441                        SkASSERT(index < coords.length);
442                        coords[index]->fX = x;
443                        coords[index]->fY = y;
444                    }
445
446                writeCoordPixels(subset, coords);
447
448                // Test #1 ////////////////////////////////////////////
449
450                const SkImageInfo info = SkImageInfo::Make(subW, subH,
451                                                           gPairs[i].fColorType,
452                                                           kPremul_SkAlphaType);
453                // Before/after comparisons easier if we attach buf
454                // to an appropriately configured SkBitmap.
455                memset(buf, 0xFF, bufSize);
456                // Config with stride greater than src but that fits in buf.
457                bufBm.installPixels(info, buf, info.minRowBytes() * 2);
458                successExpected = false;
459                // Then attempt to copy with a stride that is too large
460                // to fit in the buffer.
461                REPORTER_ASSERT(reporter,
462                    subset.copyPixelsTo(buf, bufSize, bufBm.rowBytes() * 3)
463                    == successExpected);
464
465                if (successExpected)
466                    reportCopyVerification(subset, bufBm, coords,
467                        "copyPixelsTo(buf, bufSize, 1.5*maxRowBytes)",
468                        reporter);
469
470                // Test #2 ////////////////////////////////////////////
471                // This test should always succeed, but in the case
472                // of extracted bitmaps only because we handle the
473                // issue of getSafeSize(). Without getSafeSize()
474                // buffer overrun/read would occur.
475                memset(buf, 0xFF, bufSize);
476                bufBm.installPixels(info, buf, subset.rowBytes());
477                successExpected = subset.getSafeSize() <= bufSize;
478                REPORTER_ASSERT(reporter,
479                    subset.copyPixelsTo(buf, bufSize) ==
480                        successExpected);
481                if (successExpected)
482                    reportCopyVerification(subset, bufBm, coords,
483                    "copyPixelsTo(buf, bufSize)", reporter);
484
485                // Test #3 ////////////////////////////////////////////
486                // Copy with different stride between src and dst.
487                memset(buf, 0xFF, bufSize);
488                bufBm.installPixels(info, buf, subset.rowBytes()+1);
489                successExpected = true; // Should always work.
490                REPORTER_ASSERT(reporter,
491                        subset.copyPixelsTo(buf, bufSize,
492                            subset.rowBytes()+1) == successExpected);
493                if (successExpected)
494                    reportCopyVerification(subset, bufBm, coords,
495                    "copyPixelsTo(buf, bufSize, rowBytes+1)", reporter);
496
497                // Test #4 ////////////////////////////////////////////
498                // Test copy with stride too small.
499                memset(buf, 0xFF, bufSize);
500                bufBm.installPixels(info, buf, info.minRowBytes());
501                successExpected = false;
502                // Request copy with stride too small.
503                REPORTER_ASSERT(reporter,
504                    subset.copyPixelsTo(buf, bufSize, bufBm.rowBytes()-1)
505                        == successExpected);
506                if (successExpected)
507                    reportCopyVerification(subset, bufBm, coords,
508                    "copyPixelsTo(buf, bufSize, rowBytes()-1)", reporter);
509
510#if 0   // copyPixelsFrom is gone
511                // Test #5 ////////////////////////////////////////////
512                // Tests the case where the source stride is too small
513                // for the source configuration.
514                memset(buf, 0xFF, bufSize);
515                bufBm.installPixels(info, buf, info.minRowBytes());
516                writeCoordPixels(bufBm, coords);
517                REPORTER_ASSERT(reporter,
518                    subset.copyPixelsFrom(buf, bufSize, 1) == false);
519
520                // Test #6 ///////////////////////////////////////////
521                // Tests basic copy from an external buffer to the bitmap.
522                // If the bitmap is "extracted", this also tests the case
523                // where the source stride is different from the dest.
524                // stride.
525                // We've made the buffer large enough to always succeed.
526                bufBm.installPixels(info, buf, info.minRowBytes());
527                writeCoordPixels(bufBm, coords);
528                REPORTER_ASSERT(reporter,
529                    subset.copyPixelsFrom(buf, bufSize, bufBm.rowBytes()) ==
530                        true);
531                reportCopyVerification(bufBm, subset, coords,
532                    "copyPixelsFrom(buf, bufSize)",
533                    reporter);
534
535                // Test #7 ////////////////////////////////////////////
536                // Tests the case where the source buffer is too small
537                // for the transfer.
538                REPORTER_ASSERT(reporter,
539                    subset.copyPixelsFrom(buf, 1, subset.rowBytes()) ==
540                        false);
541
542#endif
543            }
544        } // for (size_t copyCase ...
545    }
546}
547
548#include "SkColorPriv.h"
549#include "SkUtils.h"
550
551/**
552 *  Construct 4x4 pixels where we can look at a color and determine where it should be in the grid.
553 *  alpha = 0xFF, blue = 0x80, red = x, green = y
554 */
555static void fill_4x4_pixels(SkPMColor colors[16]) {
556    for (int y = 0; y < 4; ++y) {
557        for (int x = 0; x < 4; ++x) {
558            colors[y*4+x] = SkPackARGB32(0xFF, x, y, 0x80);
559        }
560    }
561}
562
563static bool check_4x4_pixel(SkPMColor color, unsigned x, unsigned y) {
564    SkASSERT(x < 4 && y < 4);
565    return  0xFF == SkGetPackedA32(color) &&
566            x    == SkGetPackedR32(color) &&
567            y    == SkGetPackedG32(color) &&
568            0x80 == SkGetPackedB32(color);
569}
570
571/**
572 *  Fill with all zeros, which will never match any value from fill_4x4_pixels
573 */
574static void clear_4x4_pixels(SkPMColor colors[16]) {
575    sk_memset32(colors, 0, 16);
576}
577
578// Much of readPixels is exercised by copyTo testing, since readPixels is the backend for that
579// method. Here we explicitly test subset copies.
580//
581DEF_TEST(BitmapReadPixels, reporter) {
582    const int W = 4;
583    const int H = 4;
584    const size_t rowBytes = W * sizeof(SkPMColor);
585    const SkImageInfo srcInfo = SkImageInfo::MakeN32Premul(W, H);
586    SkPMColor srcPixels[16];
587    fill_4x4_pixels(srcPixels);
588    SkBitmap srcBM;
589    srcBM.installPixels(srcInfo, srcPixels, rowBytes);
590
591    SkImageInfo dstInfo = SkImageInfo::MakeN32Premul(W, H);
592    SkPMColor dstPixels[16];
593
594    const struct {
595        bool     fExpectedSuccess;
596        SkIPoint fRequestedSrcLoc;
597        SkISize  fRequestedDstSize;
598        // If fExpectedSuccess, check these, otherwise ignore
599        SkIPoint fExpectedDstLoc;
600        SkIRect  fExpectedSrcR;
601    } gRec[] = {
602        { true,  { 0, 0 }, { 4, 4 }, { 0, 0 }, { 0, 0, 4, 4 } },
603        { true,  { 1, 1 }, { 2, 2 }, { 0, 0 }, { 1, 1, 3, 3 } },
604        { true,  { 2, 2 }, { 4, 4 }, { 0, 0 }, { 2, 2, 4, 4 } },
605        { true,  {-1,-1 }, { 2, 2 }, { 1, 1 }, { 0, 0, 1, 1 } },
606        { false, {-1,-1 }, { 1, 1 }, { 0, 0 }, { 0, 0, 0, 0 } },
607    };
608
609    for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
610        clear_4x4_pixels(dstPixels);
611
612        dstInfo = dstInfo.makeWH(gRec[i].fRequestedDstSize.width(),
613                                 gRec[i].fRequestedDstSize.height());
614        bool success = srcBM.readPixels(dstInfo, dstPixels, rowBytes,
615                                        gRec[i].fRequestedSrcLoc.x(), gRec[i].fRequestedSrcLoc.y());
616
617        REPORTER_ASSERT(reporter, gRec[i].fExpectedSuccess == success);
618        if (success) {
619            const SkIRect srcR = gRec[i].fExpectedSrcR;
620            const int dstX = gRec[i].fExpectedDstLoc.x();
621            const int dstY = gRec[i].fExpectedDstLoc.y();
622            // Walk the dst pixels, and check if we got what we expected
623            for (int y = 0; y < H; ++y) {
624                for (int x = 0; x < W; ++x) {
625                    SkPMColor dstC = dstPixels[y*4+x];
626                    // get into src coordinates
627                    int sx = x - dstX + srcR.x();
628                    int sy = y - dstY + srcR.y();
629                    if (srcR.contains(sx, sy)) {
630                        REPORTER_ASSERT(reporter, check_4x4_pixel(dstC, sx, sy));
631                    } else {
632                        REPORTER_ASSERT(reporter, 0 == dstC);
633                    }
634                }
635            }
636        }
637    }
638}
639
640