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Avoid allocations in bidi().

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This commit is contained in:
Nicholas Nethercote 2014-03-11 21:48:50 -07:00
parent 6a75e45309
commit 2e93a0cc98
1 changed files with 7 additions and 2 deletions
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9
src/core/bidi.js
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@ -145,6 +145,11 @@ var bidi = PDFJS.bidi = (function bidiClosure() {
this.dir = (vertical ? 'ttb' : (isLTR ? 'ltr' : 'rtl')); this.dir = (vertical ? 'ttb' : (isLTR ? 'ltr' : 'rtl'));
} }
// These are used in bidi(), which is called frequently. We re-use them on
// each call to avoid unnecessary allocations.
var chars = [];
var types = [];
function bidi(str, startLevel, vertical) { function bidi(str, startLevel, vertical) {
var isLTR = true; var isLTR = true;
var strLength = str.length; var strLength = str.length;
@ -153,8 +158,8 @@ var bidi = PDFJS.bidi = (function bidiClosure() {
} }
// Get types and fill arrays // Get types and fill arrays
var chars = []; chars.length = 0;
var types = []; types.length = 0;
var numBidi = 0; var numBidi = 0;
for (var i = 0; i < strLength; ++i) { for (var i = 0; i < strLength; ++i) {