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Zero the height and width of the Cached canvases before deleting.

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This reduces peak RSS by about 300 MiB on my Mac when scrolling slowly through
the first 30 pages of a scanned black and white document.
This commit is contained in:
Nicholas Nethercote 2014-06-16 22:58:11 -07:00
parent 2efbdfe8d4
commit 7ef7f95374
1 changed files with 8 additions and 1 deletions
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9
src/display/canvas.js
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@ -179,7 +179,14 @@ var CachedCanvases = (function CachedCanvasesClosure() {
return canvasEntry;
},
clear: function () {
cache = {};
for (var id in cache) {
var canvasEntry = cache[id];
// Zeroing the width and height causes Firefox to release graphics
// resources immediately, which can greatly reduce memory consumption.
canvasEntry.canvas.width = 0;
canvasEntry.canvas.height = 0;
delete cache[id];
}
}
};
})();