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
boolStr(bool value)12 static const char* boolStr(bool value) {
13 return value ? "true" : "false";
14 }
15
16 // these are in the same order as the SkColorType enum
17 static const char* gColorTypeName[] = {
18 "None", "A8", "565", "4444", "RGBA", "BGRA", "Index8"
19 };
20
report_opaqueness(skiatest::Reporter * reporter,const SkBitmap & src,const SkBitmap & dst)21 static 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
canHaveAlpha(SkColorType ct)28 static bool canHaveAlpha(SkColorType ct) {
29 return kRGB_565_SkColorType != ct;
30 }
31
32 // copyTo() should preserve isOpaque when it makes sense
test_isOpaque(skiatest::Reporter * reporter,const SkBitmap & srcOpaque,const SkBitmap & srcPremul,SkColorType dstColorType)33 static 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
init_src(const SkBitmap & bitmap)53 static 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
init_ctable(SkAlphaType alphaType)64 static 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
71 struct 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.
getPixel(int x,int y,const SkBitmap & bm)86 static 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.
setPixel(int x,int y,uint32_t val,SkBitmap & bm)114 static 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.
139 struct Coordinates {
140
141 const int length;
142 SkIPoint* const data;
143
CoordinatesCoordinates144 explicit Coordinates(int _length): length(_length)
145 , data(new SkIPoint[length]) { }
146
~CoordinatesCoordinates147 ~Coordinates(){
148 delete [] data;
149 }
150
operator []Coordinates151 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.
reportCopyVerification(const SkBitmap & bm1,const SkBitmap & bm2,Coordinates & coords,const char * msg,skiatest::Reporter * reporter)160 static 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.
writeCoordPixels(SkBitmap & bm,const Coordinates & coords)180 static 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
185 static 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
194 static const int W = 20;
195 static const int H = 33;
196
setup_src_bitmaps(SkBitmap * srcOpaque,SkBitmap * srcPremul,SkColorType ct)197 static 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
DEF_TEST(BitmapCopy_extractSubset,reporter)216 DEF_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(©, 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
DEF_TEST(BitmapCopy,reporter)272 DEF_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 */
fill_4x4_pixels(SkPMColor colors[16])555 static 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
check_4x4_pixel(SkPMColor color,unsigned x,unsigned y)563 static 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 */
clear_4x4_pixels(SkPMColor colors[16])574 static 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 //
DEF_TEST(BitmapReadPixels,reporter)581 DEF_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