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description("Test the behavior of canvas recovery after a gpu context loss");
var ctx;
var lostEventHasFired = false;
var contextLostTest;
if (window.internals && window.testRunner) {
testRunner.dumpAsText();
var canvas = document.createElement('canvas');
canvas.addEventListener('contextlost', contextLost);
canvas.addEventListener('contextrestored', contextRestored);
ctx = canvas.getContext('2d');
document.body.appendChild(ctx.canvas);
verifyContextLost(false);
window.internals.loseSharedGraphicsContext3D();
// for the canvas to realize its Graphics context was lost we must try to
// use the contents of the canvas -- that is, we must either try to present
// the canvas or read from it (e.g. by calling getImageData)
ctx.fillRect(0, 0, 1, 1);
shouldBeFalse('ctx.isContextLost()');
var imageData = ctx.getImageData(0, 0, 1, 1);
if (!ctx.isContextLost()) {
debug('<span>Aborting test: Graphics context loss did not destroy canvas contents. This is expected if canvas is not accelerated.</span>');
} else {
verifyContextLost(true);
testRunner.waitUntilDone();
}
} else {
testFailed('This test requires window.internals and window.testRunner.');
}
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) {
shouldBeTrue('contextLostTest');
shouldBeTrue('ctx.isContextLost()');
} else {
shouldBeFalse('contextLostTest');
shouldBeFalse('ctx.isContextLost()');
}
}
function contextLost() {
if (lostEventHasFired) {
testFailed('Context lost event was dispatched more than once.');
} else {
testPassed('Graphics context lost event dispatched.');
}
lostEventHasFired = true;
verifyContextLost(true);
}
function contextRestored() {
if (lostEventHasFired) {
testPassed('Context restored event dispatched after context lost.');
} else {
testFailed('Context restored event was dispatched before a context lost event.');
}
verifyContextLost(false);
testRunner.notifyDone();
}
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