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Merge pull request #5033 from nnethercote/makeCssRgb

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Avoid creating intermediate strings in Util.makeCssRgb().
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Tim van der Meij 2014-07-16 16:10:29 +02:00
commit e97efaa70a
1 changed files with 8 additions and 1 deletions
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src/shared/util.js
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@ -560,8 +560,15 @@ var IDENTITY_MATRIX = [1, 0, 0, 1, 0, 0];
var Util = PDFJS.Util = (function UtilClosure() {
function Util() {}
var rgbBuf = ['rgb(', 0, ',', 0, ',', 0, ')'];
// makeCssRgb() can be called thousands of times. Using |rgbBuf| avoids
// creating many intermediate strings.
Util.makeCssRgb = function Util_makeCssRgb(rgb) {
return 'rgb(' + rgb[0] + ',' + rgb[1] + ',' + rgb[2] + ')';
rgbBuf[1] = rgb[0];
rgbBuf[3] = rgb[1];
rgbBuf[5] = rgb[2];
return rgbBuf.join('');
};
// Concatenates two transformation matrices together and returns the result.