aboutsummaryrefslogtreecommitdiffhomepage
path: root/tests/CanvasTest.cpp
blob: 24c3348d15c62d47a18e9c71c57dafe7517c3d9a (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
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935

/*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

/*  Description:
 *      This test defines a series of elementatry test steps that perform
 *      a single or a small group of canvas API calls. Each test step is
 *      used in several test cases that verify that different types of SkCanvas
 *      flavors and derivatives pass it and yield consistent behavior. The
 *      test cases analyse results that are queryable through the API. They do
 *      not look at rendering results.
 *
 *  Adding test stepss:
 *      The general pattern for creating a new test step is to write a test
 *      function of the form:
 *
 *          static void MyTestStepFunction(SkCanvas* canvas,
 *                                         skiatest::Reporter* reporter,
 *                                         CanvasTestStep* testStep)
 *          {
 *              canvas->someCanvasAPImethod();
 *              (...)
 *              REPORTER_ASSERT_MESSAGE(reporter, (...), \
 *                  testStep->assertMessage());
 *          }
 *
 *      The definition of the test step function should be followed by an
 *      invocation of the TEST_STEP macro, which generates a class and
 *      instance for the test step:
 *
 *          TEST_STEP(MyTestStep, MyTestStepFunction)
 *
 *      There are also short hand macros for defining simple test steps
 *      in a single line of code.  A simple test step is a one that is made
 *      of a single canvas API call.
 *
 *          SIMPLE_TEST_STEP(MytestStep, someCanvasAPIMethod());
 *
 *      There is another macro called SIMPLE_TEST_STEP_WITH_ASSERT that
 *      works the same way as SIMPLE_TEST_STEP, and additionally verifies
 *      that the invoked method returns a non-zero value.
 */
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkDeferredCanvas.h"
#include "SkDevice.h"
#include "SkMatrix.h"
#include "SkNWayCanvas.h"
#include "SkPDFDevice.h"
#include "SkPDFDocument.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkPicture.h"
#include "SkPictureRecord.h"
#include "SkProxyCanvas.h"
#include "SkRect.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkStream.h"
#include "SkTDArray.h"
#include "Test.h"

class Canvas2CanvasClipVisitor : public SkCanvas::ClipVisitor {
public:
    Canvas2CanvasClipVisitor(SkCanvas* target) : fTarget(target) {}

    virtual void clipRect(const SkRect& r, SkRegion::Op op, bool aa) {
        fTarget->clipRect(r, op, aa);
    }
    virtual void clipPath(const SkPath& p, SkRegion::Op op, bool aa) {
        fTarget->clipPath(p, op, aa);
    }

private:
    SkCanvas* fTarget;
};

static void test_clipVisitor(skiatest::Reporter* reporter, SkCanvas* canvas) {
    SkISize size = canvas->getDeviceSize();

    SkBitmap bm;
    bm.setConfig(SkBitmap::kARGB_8888_Config, size.width(), size.height());
    SkCanvas c(bm);

    Canvas2CanvasClipVisitor visitor(&c);
    canvas->replayClips(&visitor);

    REPORTER_ASSERT(reporter, c.getTotalClip() == canvas->getTotalClip());
}

static const int kWidth = 2;
static const int kHeight = 2;
// Maximum stream length for picture serialization
static const size_t kMaxPictureBufferSize = 1024;

// Format strings that describe the test context.  The %s token is where
// the name of the test step is inserted.  The context is required for
// disambiguating the error in the case of failures that are reported in
// functions that are called multiple times in different contexts (test
// cases and test steps).
static const char* const kDefaultAssertMessageFormat = "%s";
static const char* const kCanvasDrawAssertMessageFormat =
    "Drawing test step %s with SkCanvas";
static const char* const kPictureDrawAssertMessageFormat =
    "Drawing test step %s with SkPicture";
static const char* const kPictureSecondDrawAssertMessageFormat =
    "Duplicate draw of test step %s with SkPicture";
static const char* const kPictureReDrawAssertMessageFormat =
    "Playing back test step %s from an SkPicture to another SkPicture";
static const char* const kDeferredDrawAssertMessageFormat =
    "Drawing test step %s with SkDeferredCanvas";
static const char* const kProxyDrawAssertMessageFormat =
    "Drawing test step %s with SkProxyCanvas";
static const char* const kNWayDrawAssertMessageFormat =
    "Drawing test step %s with SkNWayCanvas";
static const char* const kRoundTripAssertMessageFormat =
    "test step %s, SkPicture consistency after round trip";
static const char* const kPictureRecoringAssertMessageFormat =
    "test step %s, SkPicture state consistency after recording";
static const char* const kPicturePlaybackAssertMessageFormat =
    "test step %s, SkPicture state consistency in playback canvas";
static const char* const kDeferredPreFlushAssertMessageFormat =
    "test step %s, SkDeferredCanvas state consistency before flush";
static const char* const kDeferredPostFlushPlaybackAssertMessageFormat =
    "test step %s, SkDeferredCanvas playback canvas state consistency after flush";
static const char* const kDeferredPostSilentFlushPlaybackAssertMessageFormat =
    "test step %s, SkDeferredCanvas playback canvas state consistency after silent flush";
static const char* const kDeferredPostFlushAssertMessageFormat =
    "test step %s, SkDeferredCanvas state consistency after flush";
static const char* const kPictureResourceReuseMessageFormat =
    "test step %s, SkPicture duplicate flattened object test";
static const char* const kProxyStateAssertMessageFormat =
    "test step %s, SkProxyCanvas state consistency";
static const char* const kProxyIndirectStateAssertMessageFormat =
    "test step %s, SkProxyCanvas indirect canvas state consistency";
static const char* const kNWayStateAssertMessageFormat =
    "test step %s, SkNWayCanvas state consistency";
static const char* const kNWayIndirect1StateAssertMessageFormat =
    "test step %s, SkNWayCanvas indirect canvas 1 state consistency";
static const char* const kNWayIndirect2StateAssertMessageFormat =
    "test step %s, SkNWayCanvas indirect canvas 2 state consistency";
static const char* const kPdfAssertMessageFormat =
    "PDF sanity check failed %s";

static void createBitmap(SkBitmap* bm, SkBitmap::Config config, SkColor color) {
    bm->setConfig(config, kWidth, kHeight);
    bm->allocPixels();
    bm->eraseColor(color);
}

class CanvasTestStep;
static SkTDArray<CanvasTestStep*>& testStepArray() {
    static SkTDArray<CanvasTestStep*> theTests;
    return theTests;
}

class CanvasTestStep {
public:
    CanvasTestStep(bool fEnablePdfTesting = true) {
        *testStepArray().append() = this;
        fAssertMessageFormat = kDefaultAssertMessageFormat;
        this->fEnablePdfTesting = fEnablePdfTesting;
    }
    virtual ~CanvasTestStep() { }

    virtual void draw(SkCanvas*, skiatest::Reporter*) = 0;
    virtual const char* name() const = 0;

    const char* assertMessage() {
        fAssertMessage.printf(fAssertMessageFormat, name());
        return fAssertMessage.c_str();
    }

    void setAssertMessageFormat(const char* format) {
        fAssertMessageFormat = format;
    }

    bool enablePdfTesting() { return fEnablePdfTesting; }

private:
    SkString fAssertMessage;
    const char* fAssertMessageFormat;
    bool fEnablePdfTesting;
};

///////////////////////////////////////////////////////////////////////////////
// Constants used by test steps

const SkRect kTestRect =
    SkRect::MakeXYWH(SkIntToScalar(0), SkIntToScalar(0),
                     SkIntToScalar(2), SkIntToScalar(1));
static SkMatrix testMatrix() {
    SkMatrix matrix;
    matrix.reset();
    matrix.setScale(SkIntToScalar(2), SkIntToScalar(3));
    return matrix;
}
const SkMatrix kTestMatrix = testMatrix();
static SkPath testPath() {
    SkPath path;
    path.addRect(SkRect::MakeXYWH(SkIntToScalar(0), SkIntToScalar(0),
                                  SkIntToScalar(2), SkIntToScalar(1)));
    return path;
}
const SkPath kTestPath = testPath();
static SkRegion testRegion() {
    SkRegion region;
    SkIRect rect = SkIRect::MakeXYWH(0, 0, 2, 1);
    region.setRect(rect);
    return region;
}
const SkIRect kTestIRect = SkIRect::MakeXYWH(0, 0, 2, 1);
const SkRegion kTestRegion = testRegion();
const SkColor kTestColor = 0x01020304;
const SkPaint kTestPaint;
const SkPoint kTestPoints[3] = {
    {SkIntToScalar(0), SkIntToScalar(0)},
    {SkIntToScalar(2), SkIntToScalar(1)},
    {SkIntToScalar(0), SkIntToScalar(2)}
};
const size_t kTestPointCount = 3;
static SkBitmap testBitmap() {
    SkBitmap bitmap;
    createBitmap(&bitmap, SkBitmap::kARGB_8888_Config, 0x05060708);
    return bitmap;
}
SkBitmap kTestBitmap; // cannot be created during static init
SkString kTestText("Hello World");
SkPoint kTestPoints2[] = {
  { SkIntToScalar(0), SkIntToScalar(1) },
  { SkIntToScalar(1), SkIntToScalar(1) },
  { SkIntToScalar(2), SkIntToScalar(1) },
  { SkIntToScalar(3), SkIntToScalar(1) },
  { SkIntToScalar(4), SkIntToScalar(1) },
  { SkIntToScalar(5), SkIntToScalar(1) },
  { SkIntToScalar(6), SkIntToScalar(1) },
  { SkIntToScalar(7), SkIntToScalar(1) },
  { SkIntToScalar(8), SkIntToScalar(1) },
  { SkIntToScalar(9), SkIntToScalar(1) },
  { SkIntToScalar(10), SkIntToScalar(1) },
};


///////////////////////////////////////////////////////////////////////////////
// Macros for defining test steps

#define TEST_STEP(NAME, FUNCTION)                                       \
class NAME##_TestStep : public CanvasTestStep{                          \
public:                                                                 \
    virtual void draw(SkCanvas* canvas, skiatest::Reporter* reporter) { \
        FUNCTION (canvas, reporter, this);                              \
    }                                                                   \
    virtual const char* name() const {return #NAME ;}                   \
};                                                                      \
static NAME##_TestStep NAME##_TestStepInstance;

#define TEST_STEP_NO_PDF(NAME, FUNCTION)                                       \
class NAME##_TestStep : public CanvasTestStep{                          \
public:                                                                 \
    NAME##_TestStep() : CanvasTestStep(false) {}                        \
    virtual void draw(SkCanvas* canvas, skiatest::Reporter* reporter) { \
        FUNCTION (canvas, reporter, this);                              \
    }                                                                   \
    virtual const char* name() const {return #NAME ;}                   \
};                                                                      \
static NAME##_TestStep NAME##_TestStepInstance;

#define SIMPLE_TEST_STEP(NAME, CALL)                              \
static void NAME##TestStep(SkCanvas* canvas, skiatest::Reporter*, \
    CanvasTestStep*) {                                            \
    canvas-> CALL ;                                               \
}                                                                 \
TEST_STEP(NAME, NAME##TestStep )

#define SIMPLE_TEST_STEP_WITH_ASSERT(NAME, CALL)                           \
static void NAME##TestStep(SkCanvas* canvas, skiatest::Reporter* reporter, \
    CanvasTestStep* testStep) {                                            \
    REPORTER_ASSERT_MESSAGE(reporter, canvas-> CALL ,                      \
        testStep->assertMessage());                                        \
}                                                                          \
TEST_STEP(NAME, NAME##TestStep )


///////////////////////////////////////////////////////////////////////////////
// Basic test steps for most virtual methods in SkCanvas that draw or affect
// the state of the canvas.

SIMPLE_TEST_STEP_WITH_ASSERT(Translate,
    translate(SkIntToScalar(1), SkIntToScalar(2)));
SIMPLE_TEST_STEP_WITH_ASSERT(Scale,
    scale(SkIntToScalar(1), SkIntToScalar(2)));
SIMPLE_TEST_STEP_WITH_ASSERT(Rotate, rotate(SkIntToScalar(1)));
SIMPLE_TEST_STEP_WITH_ASSERT(Skew,
    skew(SkIntToScalar(1), SkIntToScalar(2)));
SIMPLE_TEST_STEP_WITH_ASSERT(Concat, concat(kTestMatrix));
SIMPLE_TEST_STEP(SetMatrix, setMatrix(kTestMatrix));
SIMPLE_TEST_STEP(ClipRect, clipRect(kTestRect));
SIMPLE_TEST_STEP(ClipPath, clipPath(kTestPath));
SIMPLE_TEST_STEP(ClipRegion,
    clipRegion(kTestRegion, SkRegion::kReplace_Op));
SIMPLE_TEST_STEP(Clear, clear(kTestColor));
SIMPLE_TEST_STEP(DrawPaint, drawPaint(kTestPaint));
SIMPLE_TEST_STEP(DrawPointsPoints, drawPoints(SkCanvas::kPoints_PointMode,
    kTestPointCount, kTestPoints, kTestPaint));
SIMPLE_TEST_STEP(DrawPointsLiness, drawPoints(SkCanvas::kLines_PointMode,
    kTestPointCount, kTestPoints, kTestPaint));
SIMPLE_TEST_STEP(DrawPointsPolygon, drawPoints(SkCanvas::kPolygon_PointMode,
    kTestPointCount, kTestPoints, kTestPaint));
SIMPLE_TEST_STEP(DrawRect, drawRect(kTestRect, kTestPaint));
SIMPLE_TEST_STEP(DrawPath, drawPath(kTestPath, kTestPaint));
SIMPLE_TEST_STEP(DrawBitmap, drawBitmap(kTestBitmap, 0, 0));
SIMPLE_TEST_STEP(DrawBitmapPaint, drawBitmap(kTestBitmap, 0, 0, &kTestPaint));
SIMPLE_TEST_STEP(DrawBitmapRect, drawBitmapRect(kTestBitmap, NULL, kTestRect,
    NULL));
SIMPLE_TEST_STEP(DrawBitmapRectSrcRect, drawBitmapRect(kTestBitmap,
    &kTestIRect, kTestRect, NULL));
SIMPLE_TEST_STEP(DrawBitmapRectPaint, drawBitmapRect(kTestBitmap, NULL,
    kTestRect, &kTestPaint));
SIMPLE_TEST_STEP(DrawBitmapMatrix, drawBitmapMatrix(kTestBitmap, kTestMatrix,
    NULL));
SIMPLE_TEST_STEP(DrawBitmapMatrixPaint, drawBitmapMatrix(kTestBitmap,
    kTestMatrix, &kTestPaint));
SIMPLE_TEST_STEP(DrawBitmapNine, drawBitmapNine(kTestBitmap, kTestIRect,
    kTestRect, NULL));
SIMPLE_TEST_STEP(DrawBitmapNinePaint, drawBitmapNine(kTestBitmap, kTestIRect,
    kTestRect, &kTestPaint));
SIMPLE_TEST_STEP(DrawSprite, drawSprite(kTestBitmap, 0, 0, NULL));
SIMPLE_TEST_STEP(DrawSpritePaint, drawSprite(kTestBitmap, 0, 0, &kTestPaint));
SIMPLE_TEST_STEP(DrawText, drawText(kTestText.c_str(), kTestText.size(),
    0, 1, kTestPaint));
SIMPLE_TEST_STEP(DrawPosText, drawPosText(kTestText.c_str(),
    kTestText.size(), kTestPoints2, kTestPaint));
SIMPLE_TEST_STEP(DrawTextOnPath, drawTextOnPath(kTestText.c_str(),
    kTestText.size(), kTestPath, NULL, kTestPaint));
SIMPLE_TEST_STEP(DrawTextOnPathMatrix, drawTextOnPath(kTestText.c_str(),
    kTestText.size(), kTestPath, &kTestMatrix, kTestPaint));
SIMPLE_TEST_STEP(DrawData, drawData(kTestText.c_str(), kTestText.size()));
SIMPLE_TEST_STEP(BeginGroup, beginCommentGroup(kTestText.c_str()));
SIMPLE_TEST_STEP(AddComment, addComment(kTestText.c_str(), kTestText.c_str()));
SIMPLE_TEST_STEP(EndGroup, endCommentGroup());

///////////////////////////////////////////////////////////////////////////////
// Complex test steps

// Save/restore calls cannot be in isolated simple test steps because the test
// cases that use SkPicture require that save and restore calls be balanced.
static void SaveMatrixStep(SkCanvas* canvas,
                           skiatest::Reporter* reporter,
                           CanvasTestStep* testStep) {
    int saveCount = canvas->getSaveCount();
    canvas->save(SkCanvas::kMatrix_SaveFlag);
    canvas->clipRegion(kTestRegion);
    canvas->translate(SkIntToScalar(1), SkIntToScalar(2));
    canvas->restore();
    REPORTER_ASSERT_MESSAGE(reporter, canvas->getSaveCount() == saveCount,
        testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, canvas->getTotalMatrix().isIdentity(),
        testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, canvas->getTotalClip() == kTestRegion,
        testStep->assertMessage());
}
TEST_STEP(SaveMatrix, SaveMatrixStep);

static void SaveClipStep(SkCanvas* canvas,
                         skiatest::Reporter* reporter,
                         CanvasTestStep* testStep) {
    int saveCount = canvas->getSaveCount();
    canvas->save(SkCanvas::kClip_SaveFlag);
    canvas->translate(SkIntToScalar(1), SkIntToScalar(2));
    canvas->clipRegion(kTestRegion);
    canvas->restore();
    REPORTER_ASSERT_MESSAGE(reporter, canvas->getSaveCount() == saveCount,
        testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, !canvas->getTotalMatrix().isIdentity(),
        testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, canvas->getTotalClip() != kTestRegion,
        testStep->assertMessage());
}
TEST_STEP(SaveClip, SaveClipStep);

static void SaveMatrixClipStep(SkCanvas* canvas,
                               skiatest::Reporter* reporter,
                               CanvasTestStep* testStep) {
    int saveCount = canvas->getSaveCount();
    canvas->save(SkCanvas::kMatrixClip_SaveFlag);
    canvas->translate(SkIntToScalar(1), SkIntToScalar(2));
    canvas->clipRegion(kTestRegion);
    canvas->restore();
    REPORTER_ASSERT_MESSAGE(reporter, canvas->getSaveCount() == saveCount,
        testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, canvas->getTotalMatrix().isIdentity(),
        testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, canvas->getTotalClip() != kTestRegion,
        testStep->assertMessage());
}
TEST_STEP(SaveMatrixClip, SaveMatrixClipStep);

static void SaveLayerStep(SkCanvas* canvas,
                          skiatest::Reporter* reporter,
                          CanvasTestStep* testStep) {
    int saveCount = canvas->getSaveCount();
    canvas->saveLayer(NULL, NULL);
    canvas->restore();
    REPORTER_ASSERT_MESSAGE(reporter, canvas->getSaveCount() == saveCount,
        testStep->assertMessage());
}
TEST_STEP(SaveLayer, SaveLayerStep);

static void BoundedSaveLayerStep(SkCanvas* canvas,
                          skiatest::Reporter* reporter,
                          CanvasTestStep* testStep) {
    int saveCount = canvas->getSaveCount();
    canvas->saveLayer(&kTestRect, NULL);
    canvas->restore();
    REPORTER_ASSERT_MESSAGE(reporter, canvas->getSaveCount() == saveCount,
        testStep->assertMessage());
}
TEST_STEP(BoundedSaveLayer, BoundedSaveLayerStep);

static void PaintSaveLayerStep(SkCanvas* canvas,
                          skiatest::Reporter* reporter,
                          CanvasTestStep* testStep) {
    int saveCount = canvas->getSaveCount();
    canvas->saveLayer(NULL, &kTestPaint);
    canvas->restore();
    REPORTER_ASSERT_MESSAGE(reporter, canvas->getSaveCount() == saveCount,
        testStep->assertMessage());
}
TEST_STEP(PaintSaveLayer, PaintSaveLayerStep);

static void TwoClipOpsStep(SkCanvas* canvas,
                           skiatest::Reporter*,
                           CanvasTestStep*) {
    // This test exercises a functionality in SkPicture that leads to the
    // recording of restore offset placeholders.  This test will trigger an
    // assertion at playback time if the placeholders are not properly
    // filled when the recording ends.
    canvas->clipRect(kTestRect);
    canvas->clipRegion(kTestRegion);
}
TEST_STEP(TwoClipOps, TwoClipOpsStep);

// exercise fix for http://code.google.com/p/skia/issues/detail?id=560
// ('SkPathStroker::lineTo() fails for line with length SK_ScalarNearlyZero')
static void DrawNearlyZeroLengthPathTestStep(SkCanvas* canvas,
                                             skiatest::Reporter*,
                                             CanvasTestStep*) {
    SkPaint paint;
    paint.setStrokeWidth(SkIntToScalar(1));
    paint.setStyle(SkPaint::kStroke_Style);

    SkPath path;
    SkPoint pt1 = { 0, 0 };
    SkPoint pt2 = { 0, SK_ScalarNearlyZero };
    SkPoint pt3 = { SkIntToScalar(1), 0 };
    SkPoint pt4 = { SkIntToScalar(1), SK_ScalarNearlyZero/2 };
    path.moveTo(pt1);
    path.lineTo(pt2);
    path.lineTo(pt3);
    path.lineTo(pt4);

    canvas->drawPath(path, paint);
}
TEST_STEP(DrawNearlyZeroLengthPath, DrawNearlyZeroLengthPathTestStep);

static void DrawVerticesShaderTestStep(SkCanvas* canvas,
                                       skiatest::Reporter*,
                                       CanvasTestStep*) {
    SkPoint pts[4];
    pts[0].set(0, 0);
    pts[1].set(SkIntToScalar(kWidth), 0);
    pts[2].set(SkIntToScalar(kWidth), SkIntToScalar(kHeight));
    pts[3].set(0, SkIntToScalar(kHeight));
    SkPaint paint;
    SkShader* shader = SkShader::CreateBitmapShader(kTestBitmap,
        SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
    paint.setShader(shader)->unref();
    canvas->drawVertices(SkCanvas::kTriangleFan_VertexMode, 4, pts, pts,
                         NULL, NULL, NULL, 0, paint);
}
// NYI: issue 240.
TEST_STEP_NO_PDF(DrawVerticesShader, DrawVerticesShaderTestStep);

static void DrawPictureTestStep(SkCanvas* canvas,
                                skiatest::Reporter*,
                                CanvasTestStep*) {
    SkPicture* testPicture = SkNEW_ARGS(SkPicture, ());
    SkAutoUnref aup(testPicture);
    SkCanvas* testCanvas = testPicture->beginRecording(kWidth, kHeight);
    testCanvas->scale(SkIntToScalar(2), SkIntToScalar(1));
    testCanvas->clipRect(kTestRect);
    testCanvas->drawRect(kTestRect, kTestPaint);
    canvas->drawPicture(*testPicture);
}
TEST_STEP(DrawPicture, DrawPictureTestStep);

static void SaveRestoreTestStep(SkCanvas* canvas,
                                skiatest::Reporter* reporter,
                                CanvasTestStep* testStep) {
    int baseSaveCount = canvas->getSaveCount();
    int n = canvas->save();
    REPORTER_ASSERT_MESSAGE(reporter, baseSaveCount == n, testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, baseSaveCount + 1 == canvas->getSaveCount(),
        testStep->assertMessage());
    canvas->save();
    canvas->save();
    REPORTER_ASSERT_MESSAGE(reporter, baseSaveCount + 3 == canvas->getSaveCount(),
        testStep->assertMessage());
    canvas->restoreToCount(baseSaveCount + 1);
    REPORTER_ASSERT_MESSAGE(reporter, baseSaveCount + 1 == canvas->getSaveCount(),
        testStep->assertMessage());

    // should this pin to 1, or be a no-op, or crash?
    canvas->restoreToCount(0);
    REPORTER_ASSERT_MESSAGE(reporter, 1 == canvas->getSaveCount(),
        testStep->assertMessage());
}
TEST_STEP(SaveRestore, SaveRestoreTestStep);

static void DrawLayerTestStep(SkCanvas* canvas,
                              skiatest::Reporter* reporter,
                              CanvasTestStep* testStep) {
    REPORTER_ASSERT_MESSAGE(reporter, !canvas->isDrawingToLayer(),
        testStep->assertMessage());
    canvas->save();
    REPORTER_ASSERT_MESSAGE(reporter, !canvas->isDrawingToLayer(),
        testStep->assertMessage());
    canvas->restore();

    const SkRect* bounds = NULL;    // null means include entire bounds
    const SkPaint* paint = NULL;

    canvas->saveLayer(bounds, paint);
    REPORTER_ASSERT_MESSAGE(reporter, canvas->isDrawingToLayer(),
        testStep->assertMessage());
    canvas->restore();
    REPORTER_ASSERT_MESSAGE(reporter, !canvas->isDrawingToLayer(),
        testStep->assertMessage());

    canvas->saveLayer(bounds, paint);
    canvas->saveLayer(bounds, paint);
    REPORTER_ASSERT_MESSAGE(reporter, canvas->isDrawingToLayer(),
        testStep->assertMessage());
    canvas->restore();
    REPORTER_ASSERT_MESSAGE(reporter, canvas->isDrawingToLayer(),
        testStep->assertMessage());
    canvas->restore();
    // now layer count should be 0
    REPORTER_ASSERT_MESSAGE(reporter, !canvas->isDrawingToLayer(),
        testStep->assertMessage());
}
TEST_STEP(DrawLayer, DrawLayerTestStep);

static void NestedSaveRestoreWithSolidPaintTestStep(SkCanvas* canvas,
                                      skiatest::Reporter*,
                                      CanvasTestStep*) {
    // This test step challenges the TestDeferredCanvasStateConsistency
    // test cases because the opaque paint can trigger an optimization
    // that discards previously recorded commands. The challenge is to maintain
    // correct clip and matrix stack state.
    canvas->resetMatrix();
    canvas->rotate(SkIntToScalar(30));
    canvas->save();
    canvas->translate(SkIntToScalar(2), SkIntToScalar(1));
    canvas->save();
    canvas->scale(SkIntToScalar(3), SkIntToScalar(3));
    SkPaint paint;
    paint.setColor(0xFFFFFFFF);
    canvas->drawPaint(paint);
    canvas->restore();
    canvas->restore();
}
TEST_STEP(NestedSaveRestoreWithSolidPaint, \
    NestedSaveRestoreWithSolidPaintTestStep);

static void NestedSaveRestoreWithFlushTestStep(SkCanvas* canvas,
                                      skiatest::Reporter*,
                                      CanvasTestStep*) {
    // This test step challenges the TestDeferredCanvasStateConsistency
    // test case because the canvas flush on a deferred canvas will
    // reset the recording session. The challenge is to maintain correct
    // clip and matrix stack state on the playback canvas.
    canvas->resetMatrix();
    canvas->rotate(SkIntToScalar(30));
    canvas->save();
    canvas->translate(SkIntToScalar(2), SkIntToScalar(1));
    canvas->save();
    canvas->scale(SkIntToScalar(3), SkIntToScalar(3));
    canvas->drawRect(kTestRect,kTestPaint);
    canvas->flush();
    canvas->restore();
    canvas->restore();
}
TEST_STEP(NestedSaveRestoreWithFlush, \
    NestedSaveRestoreWithFlushTestStep);

static void AssertCanvasStatesEqual(skiatest::Reporter* reporter,
                                    const SkCanvas* canvas1,
                                    const SkCanvas* canvas2,
                                    CanvasTestStep* testStep) {
    REPORTER_ASSERT_MESSAGE(reporter, canvas1->getDeviceSize() ==
        canvas2->getDeviceSize(), testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, canvas1->getSaveCount() ==
        canvas2->getSaveCount(), testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, canvas1->isDrawingToLayer() ==
        canvas2->isDrawingToLayer(), testStep->assertMessage());

    SkRect bounds1, bounds2;
    REPORTER_ASSERT_MESSAGE(reporter,
        canvas1->getClipBounds(&bounds1) == canvas2->getClipBounds(&bounds2),
        testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, bounds1 == bounds2,
                            testStep->assertMessage());

    REPORTER_ASSERT_MESSAGE(reporter, canvas1->getDrawFilter() ==
        canvas2->getDrawFilter(), testStep->assertMessage());
    SkIRect deviceBounds1, deviceBounds2;
    REPORTER_ASSERT_MESSAGE(reporter,
        canvas1->getClipDeviceBounds(&deviceBounds1) ==
        canvas2->getClipDeviceBounds(&deviceBounds2),
        testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, deviceBounds1 == deviceBounds2,
        testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, canvas1->getBounder() ==
        canvas2->getBounder(), testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, canvas1->getTotalMatrix() ==
        canvas2->getTotalMatrix(), testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, canvas1->getClipType() ==
        canvas2->getClipType(), testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, canvas1->getTotalClip() ==
        canvas2->getTotalClip(), testStep->assertMessage());

    // The following test code is commented out because the test fails when
    // the canvas is an SkPictureRecord or SkDeferredCanvas
    // Issue: http://code.google.com/p/skia/issues/detail?id=498
    // Also, creating a LayerIter on an SkProxyCanvas crashes
    // Issue: http://code.google.com/p/skia/issues/detail?id=499
    /*
    SkCanvas::LayerIter layerIter1(const_cast<SkCanvas*>(canvas1), false);
    SkCanvas::LayerIter layerIter2(const_cast<SkCanvas*>(canvas2), false);
    while (!layerIter1.done() && !layerIter2.done()) {
        REPORTER_ASSERT_MESSAGE(reporter, layerIter1.matrix() ==
            layerIter2.matrix(), testStep->assertMessage());
        REPORTER_ASSERT_MESSAGE(reporter, layerIter1.clip() ==
            layerIter2.clip(), testStep->assertMessage());
        REPORTER_ASSERT_MESSAGE(reporter, layerIter1.paint() ==
            layerIter2.paint(), testStep->assertMessage());
        REPORTER_ASSERT_MESSAGE(reporter, layerIter1.x() ==
            layerIter2.x(), testStep->assertMessage());
        REPORTER_ASSERT_MESSAGE(reporter, layerIter1.y() ==
            layerIter2.y(), testStep->assertMessage());
        layerIter1.next();
        layerIter2.next();
    }
    REPORTER_ASSERT_MESSAGE(reporter, layerIter1.done(),
        testStep->assertMessage());
    REPORTER_ASSERT_MESSAGE(reporter, layerIter2.done(),
        testStep->assertMessage());
    */
}

// The following class groups static functions that need to access
// the privates members of SkPictureRecord
class SkPictureTester {
private:
    static int EQ(const SkFlatData* a, const SkFlatData* b) {
        return *a == *b;
    }

    static void AssertFlattenedObjectsEqual(
        SkPictureRecord* referenceRecord,
        SkPictureRecord* testRecord,
        skiatest::Reporter* reporter,
        CanvasTestStep* testStep) {

        REPORTER_ASSERT_MESSAGE(reporter,
            referenceRecord->fBitmapHeap->count() ==
            testRecord->fBitmapHeap->count(), testStep->assertMessage());
        REPORTER_ASSERT_MESSAGE(reporter,
            referenceRecord->fMatrices.count() ==
            testRecord->fMatrices.count(), testStep->assertMessage());
        for (int i = 0; i < referenceRecord->fMatrices.count(); ++i) {
            REPORTER_ASSERT_MESSAGE(reporter,
                EQ(referenceRecord->fMatrices[i], testRecord->fMatrices[i]),
                testStep->assertMessage());
        }
        REPORTER_ASSERT_MESSAGE(reporter,
            referenceRecord->fPaints.count() ==
            testRecord->fPaints.count(), testStep->assertMessage());
        for (int i = 0; i < referenceRecord->fPaints.count(); ++i) {
            REPORTER_ASSERT_MESSAGE(reporter,
                EQ(referenceRecord->fPaints[i], testRecord->fPaints[i]),
                                    testStep->assertMessage());
        }
        REPORTER_ASSERT_MESSAGE(reporter,
            referenceRecord->fRegions.count() ==
            testRecord->fRegions.count(), testStep->assertMessage());
        for (int i = 0; i < referenceRecord->fRegions.count(); ++i) {
            REPORTER_ASSERT_MESSAGE(reporter,
                EQ(referenceRecord->fRegions[i], testRecord->fRegions[i]),
                                    testStep->assertMessage());
        }
        REPORTER_ASSERT_MESSAGE(reporter,
            !referenceRecord->fPathHeap ==
            !testRecord->fPathHeap,
            testStep->assertMessage());
        // The following tests are commented out because they currently
        // fail. Issue: http://code.google.com/p/skia/issues/detail?id=507
        /*
        if (referenceRecord->fPathHeap) {
            REPORTER_ASSERT_MESSAGE(reporter,
                referenceRecord->fPathHeap->count() ==
                testRecord->fPathHeap->count(),
                testStep->assertMessage());
            for (int i = 0; i < referenceRecord->fPathHeap->count(); ++i) {
                REPORTER_ASSERT_MESSAGE(reporter,
                    (*referenceRecord->fPathHeap)[i] ==
                    (*testRecord->fPathHeap)[i], testStep->assertMessage());
            }
        }
        */

    }

public:

    static void TestPictureFlattenedObjectReuse(skiatest::Reporter* reporter,
                                                CanvasTestStep* testStep,
                                                uint32_t recordFlags) {
        // Verify that when a test step is executed twice, no extra resources
        // are flattened during the second execution
        testStep->setAssertMessageFormat(kPictureDrawAssertMessageFormat);
        SkPicture referencePicture;
        SkCanvas* referenceCanvas = referencePicture.beginRecording(kWidth,
            kHeight, recordFlags);
        testStep->draw(referenceCanvas, reporter);
        SkPicture testPicture;
        SkCanvas* testCanvas = testPicture.beginRecording(kWidth,
            kHeight, recordFlags);
        testStep->draw(testCanvas, reporter);
        testStep->setAssertMessageFormat(kPictureSecondDrawAssertMessageFormat);
        testStep->draw(testCanvas, reporter);

        SkPictureRecord* referenceRecord = static_cast<SkPictureRecord*>(
            referenceCanvas);
        SkPictureRecord* testRecord = static_cast<SkPictureRecord*>(
            testCanvas);
        testStep->setAssertMessageFormat(kPictureResourceReuseMessageFormat);
        AssertFlattenedObjectsEqual(referenceRecord, testRecord,
            reporter, testStep);
    }
};

static void TestPdfDevice(skiatest::Reporter* reporter,
                          CanvasTestStep* testStep) {
    SkISize pageSize = SkISize::Make(kWidth, kHeight);
    SkPDFDevice device(pageSize, pageSize, SkMatrix::I());
    SkCanvas canvas(&device);
    testStep->setAssertMessageFormat(kPdfAssertMessageFormat);
    testStep->draw(&canvas, reporter);
    SkPDFDocument doc;
    doc.appendPage(&device);
    SkDynamicMemoryWStream stream;
    doc.emitPDF(&stream);
}

// The following class groups static functions that need to access
// the privates members of SkDeferredCanvas
class SkDeferredCanvasTester {
public:
    static void TestDeferredCanvasStateConsistency(
        skiatest::Reporter* reporter,
        CanvasTestStep* testStep,
        const SkCanvas& referenceCanvas, bool silent) {

        SkBitmap deferredStore;
        createBitmap(&deferredStore, SkBitmap::kARGB_8888_Config, 0xFFFFFFFF);
        SkBitmapDevice deferredDevice(deferredStore);
        SkAutoTUnref<SkDeferredCanvas> deferredCanvas(SkDeferredCanvas::Create(&deferredDevice));
        testStep->setAssertMessageFormat(kDeferredDrawAssertMessageFormat);
        testStep->draw(deferredCanvas, reporter);
        testStep->setAssertMessageFormat(kDeferredPreFlushAssertMessageFormat);
        AssertCanvasStatesEqual(reporter, deferredCanvas, &referenceCanvas,
            testStep);

        if (silent) {
            deferredCanvas->silentFlush();
        } else {
            deferredCanvas->flush();
        }

        testStep->setAssertMessageFormat(
            silent ? kDeferredPostSilentFlushPlaybackAssertMessageFormat :
            kDeferredPostFlushPlaybackAssertMessageFormat);
        AssertCanvasStatesEqual(reporter,
            deferredCanvas->immediateCanvas(),
            &referenceCanvas, testStep);

        // Verified that deferred canvas state is not affected by flushing
        // pending draw operations

        // The following test code is commented out because it currently fails.
        // Issue: http://code.google.com/p/skia/issues/detail?id=496
        /*
        testStep->setAssertMessageFormat(kDeferredPostFlushAssertMessageFormat);
        AssertCanvasStatesEqual(reporter, &deferredCanvas, &referenceCanvas,
            testStep);
        */
    }
};

// unused
static void TestProxyCanvasStateConsistency(
    skiatest::Reporter* reporter,
    CanvasTestStep* testStep,
    const SkCanvas& referenceCanvas) {

    SkBitmap indirectStore;
    createBitmap(&indirectStore, SkBitmap::kARGB_8888_Config, 0xFFFFFFFF);
    SkBitmapDevice indirectDevice(indirectStore);
    SkCanvas indirectCanvas(&indirectDevice);
    SkProxyCanvas proxyCanvas(&indirectCanvas);
    testStep->setAssertMessageFormat(kProxyDrawAssertMessageFormat);
    testStep->draw(&proxyCanvas, reporter);
    // Verify that the SkProxyCanvas reports consitent state
    testStep->setAssertMessageFormat(kProxyStateAssertMessageFormat);
    AssertCanvasStatesEqual(reporter, &proxyCanvas, &referenceCanvas,
        testStep);
    // Verify that the indirect canvas reports consitent state
    testStep->setAssertMessageFormat(kProxyIndirectStateAssertMessageFormat);
    AssertCanvasStatesEqual(reporter, &indirectCanvas, &referenceCanvas,
        testStep);
}

// unused
static void TestNWayCanvasStateConsistency(
    skiatest::Reporter* reporter,
    CanvasTestStep* testStep,
    const SkCanvas& referenceCanvas) {

    SkBitmap indirectStore1;
    createBitmap(&indirectStore1, SkBitmap::kARGB_8888_Config, 0xFFFFFFFF);
    SkBitmapDevice indirectDevice1(indirectStore1);
    SkCanvas indirectCanvas1(&indirectDevice1);

    SkBitmap indirectStore2;
    createBitmap(&indirectStore2, SkBitmap::kARGB_8888_Config, 0xFFFFFFFF);
    SkBitmapDevice indirectDevice2(indirectStore2);
    SkCanvas indirectCanvas2(&indirectDevice2);

    SkISize canvasSize = referenceCanvas.getDeviceSize();
    SkNWayCanvas nWayCanvas(canvasSize.width(), canvasSize.height());
    nWayCanvas.addCanvas(&indirectCanvas1);
    nWayCanvas.addCanvas(&indirectCanvas2);

    testStep->setAssertMessageFormat(kNWayDrawAssertMessageFormat);
    testStep->draw(&nWayCanvas, reporter);
    // Verify that the SkProxyCanvas reports consitent state
    testStep->setAssertMessageFormat(kNWayStateAssertMessageFormat);
    AssertCanvasStatesEqual(reporter, &nWayCanvas, &referenceCanvas,
        testStep);
    // Verify that the indirect canvases report consitent state
    testStep->setAssertMessageFormat(kNWayIndirect1StateAssertMessageFormat);
    AssertCanvasStatesEqual(reporter, &indirectCanvas1, &referenceCanvas,
        testStep);
    testStep->setAssertMessageFormat(kNWayIndirect2StateAssertMessageFormat);
    AssertCanvasStatesEqual(reporter, &indirectCanvas2, &referenceCanvas,
        testStep);
}

/*
 * This sub-test verifies that the test step passes when executed
 * with SkCanvas and with classes derrived from SkCanvas. It also verifies
 * that the all canvas derivatives report the same state as an SkCanvas
 * after having executed the test step.
 */
static void TestOverrideStateConsistency(skiatest::Reporter* reporter,
                                         CanvasTestStep* testStep) {
    SkBitmap referenceStore;
    createBitmap(&referenceStore, SkBitmap::kARGB_8888_Config, 0xFFFFFFFF);
    SkBitmapDevice referenceDevice(referenceStore);
    SkCanvas referenceCanvas(&referenceDevice);
    testStep->setAssertMessageFormat(kCanvasDrawAssertMessageFormat);
    testStep->draw(&referenceCanvas, reporter);

    SkDeferredCanvasTester::TestDeferredCanvasStateConsistency(reporter, testStep, referenceCanvas, false);

    SkDeferredCanvasTester::TestDeferredCanvasStateConsistency(reporter, testStep, referenceCanvas, true);

    // The following test code is disabled because SkProxyCanvas is
    // missing a lot of virtual overrides on get* methods, which are used
    // to verify canvas state.
    // Issue: http://code.google.com/p/skia/issues/detail?id=500

    if (false) { // avoid bit rot, suppress warning
        TestProxyCanvasStateConsistency(reporter, testStep, referenceCanvas);
    }

    // The following test code is disabled because SkNWayCanvas does not
    // report correct clipping and device bounds information
    // Issue: http://code.google.com/p/skia/issues/detail?id=501

    if (false) { // avoid bit rot, suppress warning
        TestNWayCanvasStateConsistency(reporter, testStep, referenceCanvas);
    }

    if (false) { // avoid bit rot, suppress warning
        test_clipVisitor(reporter, &referenceCanvas);
    }
}

static void TestCanvas(skiatest::Reporter* reporter) {
    // Init global here because bitmap pixels cannot be alocated during
    // static initialization
    kTestBitmap = testBitmap();

    for (int testStep = 0; testStep < testStepArray().count(); testStep++) {
        TestOverrideStateConsistency(reporter, testStepArray()[testStep]);
        SkPictureTester::TestPictureFlattenedObjectReuse(reporter,
            testStepArray()[testStep], 0);
        if (testStepArray()[testStep]->enablePdfTesting()) {
            TestPdfDevice(reporter, testStepArray()[testStep]);
        }
    }

    // Explicitly call reset(), so we don't leak the pixels (since kTestBitmap is a global)
    kTestBitmap.reset();
}

#include "TestClassDef.h"
DEFINE_TESTCLASS("Canvas", TestCanvasClass, TestCanvas)