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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, minimum-scale=1.0">
<title>Tests that zooming out in a way that triggers main-thread scroll re-clamping works properly</title>
<script src="/tests/SimpleTest/EventUtils.js"></script>
<script type="application/javascript" src="apz_test_utils.js"></script>
<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
</head>
<body>
<div style="width: 200vw; height: 2000px; background-color: linear-gradient(green,blue)"></div>
<script type="application/javascript">
const utils = SpecialPowers.getDOMWindowUtils(window);
async function test() {
// Initial state
is(await getResolution(), 1.0, "should not be zoomed");
// Zoom in and go to the bottom-right corner. This ensures the layout
// and visual scroll offsets are nonzero, which increases the chances
// that the scroll position layer alignment code will mutate the scroll
// position (see comment below).
utils.setResolutionAndScaleTo(5.0);
await promiseApzFlushedRepaints();
utils.scrollToVisual(document.scrollingElement.clientWidth * 5,
document.scrollingElement.clientHeight * 5,
utils.UPDATE_TYPE_MAIN_THREAD,
utils.SCROLL_MODE_INSTANT);
await promiseApzFlushedRepaints();
// Check that we're at the right place
is(await getResolution(), 5.0, "should be zoomed to 5.0");
is(window.scrollX, window.scrollMaxX, "layout x-coord should be maxed");
is(window.scrollY, window.scrollMaxY, "layout y-coord should be maxed");
ok(visualViewport.offsetLeft > 0, "visual x-coord should be even further");
ok(visualViewport.offsetTop > 0, "visual y-coord should be even further");
// Zoom out. This will trigger repaint requests to the main thread,
// at various intermediate resolutions. The repaint requests will
// trigger reflows, which will trigger the root scrollframe to re-clamp
// and layer-align the scroll position as part of the post-reflow action.
// The test is checking that these mutations don't end up sending a scroll
// comment 9 for the exact mechanism). In order to maximize the chances of
// catching the bug, we wait for the main thread repaint after each of the
// pinch inputs.
let zoom_out = pinchZoomOutTouchSequenceAtCenter();
// Do coordinate conversion up-front using the current resolution and
// visual viewport.
for (let entry of zoom_out) {
for (let i = 0; i < entry.length; i++) {
entry[i] = await coordinatesRelativeToScreen({
offsetX: entry[i].x,
offsetY: entry[i].y,
target: document.body,
});
}
}
// Dispatch the touch events, waiting for paints after each row in
// zoom_out.
let touchIds = [0, 1];
for (let i = 0; i < zoom_out.length; i++) {
let entry = zoom_out[i];
for (let j = 0; j < entry.length; j++) {
await new Promise(resolve => {
utils.sendNativeTouchPoint(
touchIds[j],
utils.TOUCH_CONTACT,
entry[j].x,
entry[j].y,
1,
90,
resolve
);
});
}
await promiseAllPaintsDone();
// On the last row also do the touch-up events
if (i == zoom_out.length - 1) {
for (let j = 0; j < entry.length; j++) {
await new Promise(resolve => {
utils.sendNativeTouchPoint(
touchIds[j],
utils.TOUCH_REMOVE,
entry[j].x,
entry[j].y,
1,
90,
resolve
);
});
}
}
}
// Wait for everything to stabilize
await promiseApzFlushedRepaints();
// Verify that the zoom completed and we're back at 1.0 resolution
isfuzzy(await getResolution(), 1.0, 0.0001, "should be back at initial resolution");
}
waitUntilApzStable().then(test).then(subtestDone, subtestFailed);
</script>
</body>
</html>