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Update identifier map entries and notify if they get removed.

Browse source 
This can happen through DestroyElementMaps()
Based on work by Markus Stange and Edgar Chen.
This commit is contained in:
wolfbeast 2019-12-06 14:07:01 +01:00 • committed by Roy Tam
commit 39cc10dde8
4 changed files with 81 additions and 6 deletions
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46
dom/canvas/test/reftest/filters/liveness-document-open.html Normal file
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@ -0,0 +1,46 @@
<!DOCTYPE html>
<html lang="en">
<title>canvas filters: remove referenced filter element through document.open()</title>
<body onload="loaded()">
<canvas id="canvas" width="10" height="10"></canvas>
<svg height="0">
<filter id="filter">
<feFlood flood-color="red"/>
</filter>
</svg>
<script>
function loaded() {
var ctx = document.getElementById('canvas').getContext('2d');
ctx.filter = 'url(#filter)';
ctx.fillRect(0, 0, 10, 10); // do a draw first to work around bug 1287316
document.open();
// The document.open() call removed #filter from the document. So the filter
// reference should now be invalid, and the rect should be drawn without a
// filter applied, resulting in black.
ctx.fillRect(0, 0, 10, 10);
try {
var data = ctx.getImageData(0, 0, 1, 1).data;
if (data[0] == 0 && data[1] == 0 && data[2] == 0 && data[3] == 255) {
// Successfully painted black.
document.write('PASS');
} else {
// Painted something else, like red.
document.write('FAIL');
}
} catch (e) {
document.write('getImageData failed');
}
document.close();
}
</script>

1
dom/canvas/test/reftest/filters/reftest.list
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@ -6,6 +6,7 @@ default-preferences pref(canvas.filters.enabled,true)
fuzzy-if(azureSkia,1,1500) == global-alpha.html global-alpha-ref.html
== global-composite-operation.html global-composite-operation-ref.html
== liveness.html ref.html
== liveness-document-open.html data:text/html,PASS
== multiple-drop-shadows.html shadow-ref.html
== shadow.html shadow-ref.html
== subregion-fill-paint.html subregion-ref.html