third_party/WebKit/LayoutTests/fast/canvas/canvas-lose-restore-googol-size.html - Issue 2799893002: Rewrite flaky canvas test to testharness.js to sidestep issue

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Issue 2799893002: Rewrite flaky canvas test to testharness.js to sidestep issue (Closed)

Patch Set: rebase Created 3 years, 8 months ago

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1 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">	1 <!doctype html>

2 <html>	2 <title>Canvas loss and restoration when size is extremely large and then restore d to a reasonable value</title>

3 <head>	3 <script src="../../resources/testharness.js"></script>

4 <script src="../../resources/js-test.js"></script>	4 <script src="../../resources/testharnessreport.js"></script>

5 </head>

6 <body>

7 <script>	5 <script>

8 description("Tests to ensure correct behaviour of canvas loss and restoration wh en size is extremely large then, restored to a reasonable value.");	6 async_test(t => {

	7 var canvas = document.createElement('canvas')

	8 canvas.addEventListener('contextlost', t.step_func(contextLost));

	9 canvas.addEventListener('contextrestored', t.step_func(contextRestored));

	10 var ctx = canvas.getContext('2d');

	11 var lostEventHasFired = false;

	12 verifyContextLost(false);

9	13

10 if (window.testRunner) {	14 var bigsize = 1000000000;

11 testRunner.dumpAsText();	15 canvas.width = bigsize;

12 testRunner.waitUntilDone();	16 canvas.height = bigsize;

13 }	17 verifyContextLost(true);

	18 canvas.width = bigsize;

	19 verifyContextLost(true);

	20 // Restore a reasonable dimension

	21 canvas.width = 100;

	22 canvas.height = 100;

	23 verifyContextLost(true); // Restoration is async.

14	24

15 var canvas = document.createElement('canvas')	25 function verifyContextLost(shouldBeLost) {

16 canvas.addEventListener('contextlost', contextLost);	26 // Verify context loss experimentally as well as isContextLost()

17 canvas.addEventListener('contextrestored', contextRestored);	27 ctx.fillStyle = '#0f0';

18 var ctx = canvas.getContext('2d');	28 ctx.fillRect(0, 0, 1, 1);

19 var lostEventHasFired = false;	29 var contextLostTest = ctx.getImageData(0, 0, 1, 1).data[1] == 0;

20 verifyContextLost(false);	30 assert_equals(contextLostTest, shouldBeLost, 'image data is blank');

	31 assert_equals(ctx.isContextLost(), shouldBeLost, 'context is lost');

	32 }

21	33

22 var bigsize = 1000000000;	34 function contextLost() {

23 canvas.width = bigsize;	35 assert_false(lostEventHasFired, 'contextlost event has fired');

24 canvas.height = bigsize;	36 lostEventHasFired = true;

25 verifyContextLost(true);	37 verifyContextLost(true);

26 canvas.width = bigsize;	38 }

27 verifyContextLost(true);

28 canvas.width = 100;

29 canvas.height = 100;

30 verifyContextLost(true); // Restoration is async.

31	39

32 // Restore a sane dimension	40 function contextRestored() {

33	41 assert_true(lostEventHasFired, 'contextlost event has fired');

34 function verifyContextLost(shouldBeLost) {	42 verifyContextLost(false);

35 // Verify context loss experimentally as well as isContextLost()	43 t.done();

36 ctx.fillStyle = '#0f0';

37 ctx.fillRect(0, 0, 1, 1);

38 contextLostTest = ctx.getImageData(0, 0, 1, 1).data[1] == 0;

39 if (shouldBeLost) {

40 shouldBeTrue('contextLostTest');

41 shouldBeTrue('ctx.isContextLost()');

42 } else {

43 shouldBeFalse('contextLostTest');

44 shouldBeFalse('ctx.isContextLost()');

45 }	44 }

46 }	45 });

47

48 function contextLost() {

49 if (lostEventHasFired) {

50 testFailed('Context lost event was dispatched more than once.');

51 } else {

52 testPassed('Graphics context lost event dispatched.');

53 }

54 lostEventHasFired = true;

55 verifyContextLost(true);

56 }

57

58 function contextRestored() {

59 if (lostEventHasFired) {

60 testPassed('Context restored event dispatched after context lost.');

61 } else {

62 testFailed('Context restored event was dispatched before a context lost event.');

63 }

64 verifyContextLost(false);

65 » if (window.testRunner) {

66 » testRunner.notifyDone();

67 }

68 }

69 </script>	46 </script>

70 </body>

71 </html>

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