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Replace div.dataset with a WeakMap in text_layer.js

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This patch improves performance by avoiding unnecessary type
conversions, which also help the JIT for optimizations.

Moreover, this patch fixes issues with the div expansion code where
`textScale` would be undefined in a division. Because of the `dataset`
usage, other comparisons evaluated to `true` while `false` would have
been correct. This makes the expansion mode now work correctly for cases
with, for example, each glyph in one div.

The polyfill for `WeakMap` has been provided by @yurydelendik.
This commit is contained in:
Tim van der Meij 2016-09-02 18:10:37 +02:00
parent b10add14f3
commit b3818d5c36
2 changed files with 117 additions and 65 deletions
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33
src/shared/util.js
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@ -1442,6 +1442,39 @@ function createPromiseCapability() {
//#endif
})();
//#if !MOZCENTRAL
(function WeakMapClosure() {
if (globalScope.WeakMap) {
return;
}
var id = 0;
function WeakMap() {
this.id = '$weakmap' + (id++);
}
WeakMap.prototype = {
has: function(obj) {
return !!Object.getOwnPropertyDescriptor(obj, this.id);
},
get: function(obj, defaultValue) {
return this.has(obj) ? obj[this.id] : defaultValue;
},
set: function(obj, value) {
Object.defineProperty(obj, this.id, {
value: value,
enumerable: false,
configurable: true
});
},
delete: function(obj) {
delete obj[this.id];
}
};
globalScope.WeakMap = WeakMap;
})();
//#endif
var StatTimer = (function StatTimerClosure() {
function rpad(str, pad, length) {
while (str.length < length) {