mirrors/pdf.js
1
0
Fork 0
mirror of https://github.com/mozilla/pdf.js.git synced 2025-04-25 09:38:06 +02:00
Code Activity

Optimize common cases in hexToStr().

Browse source 
This avoids the creation of over two million array objects when viewing
http://www.dynacw.co.jp/Portals/3/fontsamplepdf/sample_4942546800828.pdf,
and reduces load time from 76 to 73 ms.
This commit is contained in:
Nicholas Nethercote 2014-07-22 22:09:54 -07:00
parent c7f02d2c8e
commit 501446ccc4
1 changed files with 8 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

8
src/core/cmap.js
View file

@ -313,6 +313,14 @@ var BinaryCMapReader = (function BinaryCMapReaderClosure() {
}
function hexToStr(a, size) {
// This code is hot. Special-case some common values to avoid creating an
// object with subarray().
if (size == 1) {
return String.fromCharCode(a[0], a[1]);
}
if (size == 3) {
return String.fromCharCode(a[0], a[1], a[2], a[3]);
}
return String.fromCharCode.apply(null, a.subarray(0, size + 1));
}