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Migration of the JPX code (from jpx5)

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notmasteryet 2012-01-11 20:08:46 -06:00
parent 93bb2cf0d3
commit 93ca387d1b
6 changed files with 1905 additions and 1 deletions
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71
src/stream.js
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@ -869,6 +869,77 @@ var JpegStream = (function JpegStreamClosure() {
return JpegStream;
})();
/**
* For JPEG 2000's we use a library to decode these images and
* the stream behaves like all the other DecodeStreams.
*/
var JpxStream = (function jpxStream() {
function constructor(bytes, dict) {
this.dict = dict;
this.bytes = bytes;
DecodeStream.call(this);
}
constructor.prototype = Object.create(DecodeStream.prototype);
constructor.prototype.ensureBuffer = function jpxStreamEnsureBuffer(req) {
if (this.bufferLength)
return;
var jpxImage = new JpxImage();
jpxImage.parse(this.bytes);
var width = jpxImage.width;
var height = jpxImage.height;
var componentsCount = jpxImage.componentsCount;
if (componentsCount != 1 && componentsCount != 3 && componentsCount != 4)
error('JPX with ' + componentsCount + ' components is not supported');
var data = new Uint8Array(width * height * componentsCount);
for (var k = 0, kk = jpxImage.tiles.length; k < kk; k++) {
var tile = jpxImage.tiles[k];
var tileWidth = tile[0].width;
var tileHeight = tile[0].height;
var tileLeft = tile[0].left;
var tileTop = tile[0].top;
var data0 = tile[0].items;
var data1 = componentsCount > 1 ? tile[1].items : null;
var data2 = componentsCount > 1 ? tile[2].items : null;
var data3 = componentsCount > 3 ? tile[3].items : null;
var dataPosition = (width * tileTop + tileLeft) * componentsCount;
var sourcePosition = 0;
for (var j = 0; j < tileHeight; j++) {
for (var i = 0; i < tileWidth; i++) {
data[dataPosition++] = data0[sourcePosition];
if (componentsCount > 1) {
data[dataPosition++] = data1[sourcePosition];
data[dataPosition++] = data2[sourcePosition];
if (componentsCount > 3)
data[dataPosition++] = data3[sourcePosition];
}
sourcePosition++;
}
dataPosition += componentsCount * (width - tileWidth);
}
}
this.buffer = data;
this.bufferLength = data.length;
};
constructor.prototype.getIR = function jpxStreamGetIR() {
return this.src;
};
constructor.prototype.getChar = function jpxStreamGetChar() {
error('internal error: getChar is not valid on JpxStream');
};
return constructor;
})();
var DecryptStream = (function DecryptStreamClosure() {
function DecryptStream(str, decrypt) {
this.str = str;