mozilla-central/gfx/tests/chrome/test_device_reset.html

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Test Info:

<!DOCTYPE html>
<html>
<!--
-->
<head>
<meta charset="utf-8">
<title>Test device reset</title>
<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
</head>
<body>
<script>
var importObj = {};
var windows = SpecialPowers.Services.ww.getWindowEnumerator();
var windowutils;
while (windows.hasMoreElements()) {
windowutils = windows.getNext().windowUtils;
}
const PAGE_WIDTH = 200;
const PAGE_HEIGHT = 200;
// Helper functions
function testCompositor(ctx) {
takeWindowSnapshot(ctx);
var testPassed = true;
if (!verifyCanvasRendering(ctx)) {
testPassed = false;
}
return testPassed;
}
function testPixel(ctx, x, y, r, g, b, a, fuzz) {
var data = ctx.getImageData(x, y, 1, 1);
if (Math.abs(data.data[0] - r) <= fuzz &&
Math.abs(data.data[1] - g) <= fuzz &&
Math.abs(data.data[2] - b) <= fuzz &&
Math.abs(data.data[3] - a) <= fuzz) {
return true;
}
return false;
}
function verifyCanvasRendering(ctx) {
return testPixel(ctx, 20, 20, 140, 25, 86, 255, 0);
}
function takeWindowSnapshot(ctx) {
var flags = ctx.DRAWWINDOW_DRAW_CARET | ctx.DRAWWINDOW_DRAW_VIEW | ctx.DRAWWINDOW_USE_WIDGET_LAYERS;
ctx.drawWindow(window, 0, 0, PAGE_WIDTH, PAGE_HEIGHT, "rgb(140,25,86)", flags);
}
function createCanvas() {
let canvas = document.createElementNS("http://www.w3.org/1999/xhtml", "canvas");
canvas.setAttribute("width", PAGE_WIDTH + "px");
canvas.setAttribute("height", PAGE_HEIGHT + "px");
return canvas;
}
// Test runner code
windowutils.triggerDeviceReset();
SimpleTest.waitForExplicitFinish();
window.addEventListener("MozAfterPaint", function paintHandle() {
// Add more latency before calling runCanvasTest()
// runCanvasTest() needs to be called after gecko's device reset handling.
// Since Bug 1757879 fix, the triggerDeviceReset() does the device reset
// handling asynchronously.
window.requestAnimationFrame(() => {
runCanvasTest();
});
window.removeEventListener("MozAfterPaint", paintHandle);
});
function runCanvasTest() {
const canvas = createCanvas();
const ctx = canvas.getContext("2d");
document.body.appendChild(canvas);
ok(testCompositor(ctx), "Canvas did not get rendered after device reset");
SimpleTest.finish();
}
</script>
</body>
</html>