ZenBrowserMirrors/pdf.js
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Second stage, smasks now working. Still needs optimization.

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This commit is contained in:
Brendan Dahl 2011-12-08 12:50:34 -08:00
parent 2a632d4ab2
commit 146cd8c861
4 changed files with 88 additions and 101 deletions
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27
src/core.js
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@ -560,7 +560,7 @@ var PDFDoc = (function pdfDoc() {
var type = data[1];
switch (type) {
case 'Jpeg':
case 'Image':
var imageData = data[2];
this.objs.resolve(id, imageData);
break;
@ -610,21 +610,32 @@ var PDFDoc = (function pdfDoc() {
messageHandler.on('jpeg_decode', function(message) {
var imageData = message.data[0];
var components = message.data[1];
if (components != 3 && components != 1)
error('Only 3 component or 1 component can be returned');
var img = new Image();
img.onload = (function jpegImageLoaderOnload() {
var width = img.width;
var height = img.height;
var length = width * height * 4;
var buf = new Uint8Array(length);
var size = width * height;
var rgbaLength = size * 4;
var buf = new Uint8Array(size * components);
var tempCanvas = new ScratchCanvas(width, height);
var tempCtx = tempCanvas.getContext('2d');
tempCtx.drawImage(img, 0, 0);
var data = tempCtx.getImageData(0, 0, width, height).data;
for (var i = 0; i < length; i += 4) {
buf[i] = data[i];
buf[i + 1] = data[i + 1];
buf[i + 2] = data[i + 2];
buf[i + 3] = data[i + 3];
if (components == 3) {
for (var i = 0, j = 0; i < rgbaLength; i += 4, j += 3) {
buf[j] = data[i];
buf[j + 1] = data[i + 1];
buf[j + 2] = data[i + 2];
}
} else if(components == 1) {
for (var i = 0, j = 0; i < rgbaLength; i += 4, j++) {
buf[j] = data[i];
}
}
message.resolve({ data: buf, width: width, height: height});
}).bind(this);