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description("Test the behavior of canvas recovery after a gpu context loss");
var recoveryLoopPeriod = 5;
var ctx;
var imageData;
var imgdata;
if (window.internals && window.testRunner) {
testRunner.dumpAsText();
ctx = document.createElement('canvas').getContext('2d');
document.body.appendChild(ctx.canvas);
ctx.fillStyle = '#f00';
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
imageData = ctx.getImageData(0, 0, 1, 1);
imgdata = imageData.data;
shouldBe("imgdata[0]", "255");
shouldBe("imgdata[1]", "0");
shouldBe("imgdata[2]", "0");
shouldBe("imgdata[3]", "255");
window.internals.loseSharedGraphicsContext3D();
// Verify whether canvas contents are lost with the graphics context.
imageData = ctx.getImageData(0, 0, 1, 1);
if (imageData.data[0] == 255) {
debug('<span>Aborting test: Graphics context loss did not destroy canvas contents. This is expected if canvas is not accelerated.</span>');
} else {
// Redrawing immediately will fail because we are working with an
// unrecovered context here. The context recovery is asynchronous
// because it requires the context loss notification task to be
// processed on the renderer main thread, which triggers the
// re-creation of the SharedGC3D.
ctx.fillStyle = '#0f0';
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
imageData = ctx.getImageData(0, 0, 1, 1);
imgdata = imageData.data;
shouldBe("imgdata[0]", "0");
shouldBe("imgdata[1]", "0");
shouldBe("imgdata[2]", "0");
shouldBe("imgdata[3]", "0");
testRunner.waitUntilDone();
setTimeout(recoveryLoop, recoveryLoopPeriod);
}
} else {
testFailed('This test requires window.internals and window.testRunner.');
}
// Graphics context recovery happens asynchronously. To test for recovery, we keep
// retrying to use the canvas until it succeeds, which should hapen long before the test
// times-out.
function recoveryLoop() {
ctx.fillStyle = '#00f';
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
imageData = ctx.getImageData(0, 0, 1, 1);
if (imageData.data[2] == 255) {
testPassed('Graphics context recovered.');
testRunner.notifyDone();
} else {
// Context not yet recovered. Try again.
setTimeout(recoveryLoop, recoveryLoopPeriod);
}
}
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