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Adds color components decoding to the JPEG

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This commit is contained in:
Yury Delendik 2014-06-03 08:51:57 -05:00
parent 2449142fc3
commit 6235e3a61c
2 changed files with 32 additions and 5 deletions
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15
src/core/jpg.js
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@ -811,7 +811,7 @@ var JpegImage = (function jpegImage() {
var scaleX = this.width / width, scaleY = this.height / height;
var component, componentScaleX, componentScaleY, blocksPerScanline;
var x, y, i, j;
var x, y, i, j, k;
var index;
var offset = 0;
var output;
@ -843,6 +843,17 @@ var JpegImage = (function jpegImage() {
}
}
}
// decodeTransform will contains pairs of multiplier (-256..256) and
// additive
var transform = this.decodeTransform;
if (transform) {
for (i = 0; i < dataLength;) {
for (j = 0, k = 0; j < numComponents; j++, i++, k += 2) {
data[i] = ((data[i] * transform[k]) >> 8) + transform[k + 1];
}
}
}
return data;
},
@ -852,8 +863,6 @@ var JpegImage = (function jpegImage() {
return true;
} else if (this.numComponents == 3) {
return true;
} else if (typeof this.colorTransform !== 'undefined') {
return !!this.colorTransform;
} else {
return false;
}