yetangitu/pdf.js
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Avoid an allocation in readCharCode().

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readCharCode() returns two values, and currently allocates a length-2
array on every call to do so. This change makes it instead us a
passed-in object which can be reused.

This tiny change reduces the total JS allocations done for the document
in Mozilla bug 992125 by 4.2%.
This commit is contained in:
Nicholas Nethercote 2014-08-10 22:27:04 -07:00
parent 0e4d9061b2
commit 61e6b576d4
3 changed files with 21 additions and 16 deletions
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7
src/core/fonts.js
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@ -4574,10 +4574,11 @@ var Font = (function FontClosure() {
if (this.cMap) {
// composite fonts have multi-byte strings convert the string from
// single-byte to multi-byte
var c = {};
while (i < chars.length) {
var c = this.cMap.readCharCode(chars, i);
charcode = c[0];
var length = c[1];
this.cMap.readCharCode(chars, i, c);
charcode = c.charcode;
var length = c.length;
i += length;
glyph = this.charToGlyph(charcode);
glyphs.push(glyph);