| <html> |
| <head> |
| <script src="../../resources/js-test.js"></script> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| </head> |
| <body> |
| <script> |
| let ctx; |
| let lostEventHasFired = false; |
| |
| function verifyContextLost(shouldBeLost) { |
| // Verify context loss experimentally as well as isContextLost() |
| ctx.fillStyle = '#0f0'; |
| ctx.fillRect(0, 0, 1, 1); |
| contextLostTest = ctx.getImageData(0, 0, 1, 1).data[1] == 0; |
| if (shouldBeLost) { |
| assert_true(contextLostTest); |
| assert_true(ctx.isContextLost()); |
| } else { |
| assert_false(contextLostTest); |
| assert_false(ctx.isContextLost()); |
| } |
| } |
| |
| function contextLost() { |
| assert_false(lostEventHasFired, 'Context lost event was dispatched more than once.'); |
| lostEventHasFired = true; |
| verifyContextLost(true); |
| } |
| |
| function contextRestored() { |
| assert_true(lostEventHasFired, 'Context restored event was dispatched before a context lost event.'); |
| verifyContextLost(false); |
| } |
| |
| async_test(function(t) { |
| if (window.internals) { |
| var canvas = document.createElement('canvas'); |
| canvas.addEventListener('contextlost', contextLost); |
| canvas.addEventListener('contextrestored', contextRestored); |
| ctx = canvas.getContext('2d', {willReadFrequently: true}); |
| |
| ctx.fillRect(0, 0, 1, 1); |
| // setTimeout creates a frame barrier that locks the canvas into gpu |
| // acceleration mode when running under virtual/gpu |
| setTimeout(t.step_func_done(() => { |
| // Now it is safe to use verifyContextLost without fearing side-effects |
| // because a rendering mode was fixed. |
| verifyContextLost(false); |
| |
| internals.forceLoseCanvasContext(ctx); |
| if (!ctx.isContextLost()) { |
| assert_true(false, "canvas context is not lost properly. This is expected if canvas is not accelerated."); |
| } else { |
| verifyContextLost(true); |
| } |
| }, 0)); |
| } else { |
| assert_true(false, 'This test requires window.internals.'); |
| } |
| }, "Test the behavior of disconneced canvas recovery after a gpu context loss"); |
| |
| </script> |
| </body> |
| </html> |
