/* Copyright 2017 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.JpegStream = undefined;
var _util = require('../shared/util');
var _stream = require('./stream');
var _primitives = require('./primitives');
var _jpg = require('./jpg');
var JpegStream = function JpegStreamClosure() {
function JpegStream(stream, maybeLength, dict, params) {
var ch = void 0;
while ((ch = stream.getByte()) !== -1) {
Eif (ch === 0xFF) {
stream.skip(-1);
break;
}
}
this.stream = stream;
this.maybeLength = maybeLength;
this.dict = dict;
this.params = params;
_stream.DecodeStream.call(this, maybeLength);
}
JpegStream.prototype = Object.create(_stream.DecodeStream.prototype);
Object.defineProperty(JpegStream.prototype, 'bytes', {
get: function JpegStream_bytes() {
return (0, _util.shadow)(this, 'bytes', this.stream.getBytes(this.maybeLength));
},
configurable: true
});
JpegStream.prototype.ensureBuffer = function (requested) {};
JpegStream.prototype.readBlock = function () {
Iif (this.eof) {
return;
}
var jpegImage = new _jpg.JpegImage();
var decodeArr = this.dict.getArray('Decode', 'D');
Iif (this.forceRGB && Array.isArray(decodeArr)) {
var bitsPerComponent = this.dict.get('BitsPerComponent') || 8;
var decodeArrLength = decodeArr.length;
var transform = new Int32Array(decodeArrLength);
var transformNeeded = false;
var maxValue = (1 << bitsPerComponent) - 1;
for (var i = 0; i < decodeArrLength; i += 2) {
transform[i] = (decodeArr[i + 1] - decodeArr[i]) * 256 | 0;
transform[i + 1] = decodeArr[i] * maxValue | 0;
if (transform[i] !== 256 || transform[i + 1] !== 0) {
transformNeeded = true;
}
}
if (transformNeeded) {
jpegImage.decodeTransform = transform;
}
}
Iif ((0, _primitives.isDict)(this.params)) {
var colorTransform = this.params.get('ColorTransform');
if (Number.isInteger(colorTransform)) {
jpegImage.colorTransform = colorTransform;
}
}
jpegImage.parse(this.bytes);
var data = jpegImage.getData(this.drawWidth, this.drawHeight, this.forceRGB);
this.buffer = data;
this.bufferLength = data.length;
this.eof = true;
};
JpegStream.prototype.getIR = function () {
var forceDataSchema = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
return (0, _util.createObjectURL)(this.bytes, 'image/jpeg', forceDataSchema);
};
return JpegStream;
}();
exports.JpegStream = JpegStream; |