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Merge pull request #4889 from CodingFabian/optimize-jpg-loops

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Optimized loops in JPG conversion.
This commit is contained in:
Yury Delendik 2014-06-04 15:34:48 -05:00
commit 43a103d5d3
1 changed files with 8 additions and 9 deletions
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17
src/core/jpg.js
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@ -870,7 +870,7 @@ var JpegImage = (function jpegImage() {
_convertYccToRgb: function convertYccToRgb(data) {
var Y, Cb, Cr;
for (var i = 0; i < data.length; i += this.numComponents) {
for (var i = 0, length = data.length; i < length; i += 3) {
Y = data[i ];
Cb = data[i + 1];
Cr = data[i + 2];
@ -884,7 +884,7 @@ var JpegImage = (function jpegImage() {
_convertYcckToRgb: function convertYcckToRgb(data) {
var Y, Cb, Cr, k, CbCb, CbCr, CbY, Cbk, CrCr, Crk, CrY, YY, Yk, kk;
var offset = 0;
for (var i = 0; i < data.length; i += this.numComponents) {
for (var i = 0, length = data.length; i < length; i += 4) {
Y = data[i];
Cb = data[i + 1];
Cr = data[i + 2];
@ -937,7 +937,7 @@ var JpegImage = (function jpegImage() {
_convertYcckToCmyk: function convertYcckToCmyk(data) {
var Y, Cb, Cr;
for (var i = 0; i < data.length; i += this.numComponents) {
for (var i = 0, length = data.length; i < length; i += 4) {
Y = data[i];
Cb = data[i + 1];
Cr = data[i + 2];
@ -952,14 +952,13 @@ var JpegImage = (function jpegImage() {
_convertCmykToRgb: function convertCmykToRgb(data) {
var c, m, y, k;
var offset = 0;
var length = data.length;
var min = -255 * 255 * 255;
var scale = 1 / 255 / 255;
for (var i = 0; i < length;) {
c = data[i++];
m = data[i++];
y = data[i++];
k = data[i++];
for (var i = 0, length = data.length; i < length; i += 4) {
c = data[i];
m = data[i + 1];
y = data[i + 2];
k = data[i + 3];
var r =
c * (-4.387332384609988 * c + 54.48615194189176 * m +