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Move JpegStream and JpxStream to their own files

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This commit is contained in:
Jonas Jenwald 2017-10-26 13:00:09 +02:00
parent 0052dc2b0d
commit 36593d6bbc
6 changed files with 213 additions and 170 deletions
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3
src/core/evaluator.js
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@ -20,7 +20,7 @@ import {
UNSUPPORTED_FEATURES, Util, warn
} from '../shared/util';
import { CMapFactory, IdentityCMap } from './cmap';
import { DecodeStream, JpegStream, Stream } from './stream';
import { DecodeStream, Stream } from './stream';
import {
Dict, isCmd, isDict, isEOF, isName, isRef, isStream, Name
} from './primitives';
@ -44,6 +44,7 @@ import { ColorSpace } from './colorspace';
import { getGlyphsUnicode } from './glyphlist';
import { getMetrics } from './metrics';
import { isPDFFunction } from './function';
import { JpegStream } from './jpeg_stream';
import { MurmurHash3_64 } from './murmurhash3';
import { PDFImage } from './image';

3
src/core/image.js
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@ -14,9 +14,10 @@
*/
import { assert, FormatError, ImageKind, info, warn } from '../shared/util';
import { DecodeStream, JpegStream } from './stream';
import { isStream, Name } from './primitives';
import { ColorSpace } from './colorspace';
import { DecodeStream } from './stream';
import { JpegStream } from './jpeg_stream';
import { JpxImage } from './jpx';
var PDFImage = (function PDFImageClosure() {

112
src/core/jpeg_stream.js Normal file
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@ -0,0 +1,112 @@
/* Copyright 2012 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.
*/
import { createObjectURL, shadow } from '../shared/util';
import { DecodeStream } from './stream';
import { isDict } from './primitives';
import { JpegImage } from './jpg';
/**
* Depending on the type of JPEG a JpegStream is handled in different ways. For
* JPEG's that are supported natively such as DeviceGray and DeviceRGB the image
* data is stored and then loaded by the browser. For unsupported JPEG's we use
* a library to decode these images and the stream behaves like all the other
* DecodeStreams.
*/
var JpegStream = (function JpegStreamClosure() {
function JpegStream(stream, maybeLength, dict, params) {
// Some images may contain 'junk' before the SOI (start-of-image) marker.
// Note: this seems to mainly affect inline images.
var ch;
while ((ch = stream.getByte()) !== -1) {
if (ch === 0xFF) { // Find the first byte of the SOI marker (0xFFD8).
stream.skip(-1); // Reset the stream position to the SOI.
break;
}
}
this.stream = stream;
this.maybeLength = maybeLength;
this.dict = dict;
this.params = params;
DecodeStream.call(this, maybeLength);
}
JpegStream.prototype = Object.create(DecodeStream.prototype);
Object.defineProperty(JpegStream.prototype, 'bytes', {
get: function JpegStream_bytes() {
// If this.maybeLength is null, we'll get the entire stream.
return shadow(this, 'bytes', this.stream.getBytes(this.maybeLength));
},
configurable: true,
});
JpegStream.prototype.ensureBuffer = function JpegStream_ensureBuffer(req) {
if (this.bufferLength) {
return;
}
var jpegImage = new JpegImage();
// Checking if values need to be transformed before conversion.
var decodeArr = this.dict.getArray('Decode', 'D');
if (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;
}
}
// Fetching the 'ColorTransform' entry, if it exists.
if (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.getBytes = function JpegStream_getBytes(length) {
this.ensureBuffer();
return this.buffer;
};
JpegStream.prototype.getIR = function JpegStream_getIR(forceDataSchema) {
return createObjectURL(this.bytes, 'image/jpeg', forceDataSchema);
};
return JpegStream;
})();
export {
JpegStream,
};

92
src/core/jpx_stream.js Normal file
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@ -0,0 +1,92 @@
/* Copyright 2012 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.
*/
import { DecodeStream } from './stream';
import { JpxImage } from './jpx';
import { shadow } from '../shared/util';
/**
* For JPEG 2000's we use a library to decode these images and
* the stream behaves like all the other DecodeStreams.
*/
var JpxStream = (function JpxStreamClosure() {
function JpxStream(stream, maybeLength, dict, params) {
this.stream = stream;
this.maybeLength = maybeLength;
this.dict = dict;
this.params = params;
DecodeStream.call(this, maybeLength);
}
JpxStream.prototype = Object.create(DecodeStream.prototype);
Object.defineProperty(JpxStream.prototype, 'bytes', {
get: function JpxStream_bytes() {
// If this.maybeLength is null, we'll get the entire stream.
return shadow(this, 'bytes', this.stream.getBytes(this.maybeLength));
},
configurable: true,
});
JpxStream.prototype.ensureBuffer = function JpxStream_ensureBuffer(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;
var tileCount = jpxImage.tiles.length;
if (tileCount === 1) {
this.buffer = jpxImage.tiles[0].items;
} else {
var data = new Uint8ClampedArray(width * height * componentsCount);
for (var k = 0; k < tileCount; k++) {
var tileComponents = jpxImage.tiles[k];
var tileWidth = tileComponents.width;
var tileHeight = tileComponents.height;
var tileLeft = tileComponents.left;
var tileTop = tileComponents.top;
var src = tileComponents.items;
var srcPosition = 0;
var dataPosition = (width * tileTop + tileLeft) * componentsCount;
var imgRowSize = width * componentsCount;
var tileRowSize = tileWidth * componentsCount;
for (var j = 0; j < tileHeight; j++) {
var rowBytes = src.subarray(srcPosition, srcPosition + tileRowSize);
data.set(rowBytes, dataPosition);
srcPosition += tileRowSize;
dataPosition += imgRowSize;
}
}
this.buffer = data;
}
this.bufferLength = this.buffer.length;
this.eof = true;
};
return JpxStream;
})();
export {
JpxStream,
};

6
src/core/parser.js
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@ -14,8 +14,8 @@
*/
import {
Ascii85Stream, AsciiHexStream, FlateStream, JpegStream, JpxStream, LZWStream,
NullStream, PredictorStream, RunLengthStream
Ascii85Stream, AsciiHexStream, FlateStream, LZWStream, NullStream,
PredictorStream, RunLengthStream
} from './stream';
import {
assert, FormatError, info, isNum, isString, MissingDataException, StreamType,
@ -26,6 +26,8 @@ import {
} from './primitives';
import { CCITTFaxStream } from './ccitt_stream';
import { Jbig2Stream } from './jbig2_stream';
import { JpegStream } from './jpeg_stream';
import { JpxStream } from './jpx_stream';
var MAX_LENGTH_TO_CACHE = 1000;

167
src/core/stream.js
View File

@ -13,12 +13,8 @@
* limitations under the License.
*/
import {
createObjectURL, FormatError, isSpace, shadow, stringToBytes, Util
} from '../shared/util';
import { FormatError, isSpace, stringToBytes, Util } from '../shared/util';
import { isDict } from './primitives';
import { JpegImage } from './jpg';
import { JpxImage } from './jpx';
var Stream = (function StreamClosure() {
function Stream(arrayBuffer, start, length, dict) {
@ -871,165 +867,6 @@ var PredictorStream = (function PredictorStreamClosure() {
return PredictorStream;
})();
/**
* Depending on the type of JPEG a JpegStream is handled in different ways. For
* JPEG's that are supported natively such as DeviceGray and DeviceRGB the image
* data is stored and then loaded by the browser. For unsupported JPEG's we use
* a library to decode these images and the stream behaves like all the other
* DecodeStreams.
*/
var JpegStream = (function JpegStreamClosure() {
function JpegStream(stream, maybeLength, dict, params) {
// Some images may contain 'junk' before the SOI (start-of-image) marker.
// Note: this seems to mainly affect inline images.
var ch;
while ((ch = stream.getByte()) !== -1) {
if (ch === 0xFF) { // Find the first byte of the SOI marker (0xFFD8).
stream.skip(-1); // Reset the stream position to the SOI.
break;
}
}
this.stream = stream;
this.maybeLength = maybeLength;
this.dict = dict;
this.params = params;
DecodeStream.call(this, maybeLength);
}
JpegStream.prototype = Object.create(DecodeStream.prototype);
Object.defineProperty(JpegStream.prototype, 'bytes', {
get: function JpegStream_bytes() {
// If this.maybeLength is null, we'll get the entire stream.
return shadow(this, 'bytes', this.stream.getBytes(this.maybeLength));
},
configurable: true,
});
JpegStream.prototype.ensureBuffer = function JpegStream_ensureBuffer(req) {
if (this.bufferLength) {
return;
}
var jpegImage = new JpegImage();
// Checking if values need to be transformed before conversion.
var decodeArr = this.dict.getArray('Decode', 'D');
if (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;
}
}
// Fetching the 'ColorTransform' entry, if it exists.
if (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.getBytes = function JpegStream_getBytes(length) {
this.ensureBuffer();
return this.buffer;
};
JpegStream.prototype.getIR = function JpegStream_getIR(forceDataSchema) {
return createObjectURL(this.bytes, 'image/jpeg', forceDataSchema);
};
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 JpxStreamClosure() {
function JpxStream(stream, maybeLength, dict, params) {
this.stream = stream;
this.maybeLength = maybeLength;
this.dict = dict;
this.params = params;
DecodeStream.call(this, maybeLength);
}
JpxStream.prototype = Object.create(DecodeStream.prototype);
Object.defineProperty(JpxStream.prototype, 'bytes', {
get: function JpxStream_bytes() {
// If this.maybeLength is null, we'll get the entire stream.
return shadow(this, 'bytes', this.stream.getBytes(this.maybeLength));
},
configurable: true,
});
JpxStream.prototype.ensureBuffer = function JpxStream_ensureBuffer(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;
var tileCount = jpxImage.tiles.length;
if (tileCount === 1) {
this.buffer = jpxImage.tiles[0].items;
} else {
var data = new Uint8ClampedArray(width * height * componentsCount);
for (var k = 0; k < tileCount; k++) {
var tileComponents = jpxImage.tiles[k];
var tileWidth = tileComponents.width;
var tileHeight = tileComponents.height;
var tileLeft = tileComponents.left;
var tileTop = tileComponents.top;
var src = tileComponents.items;
var srcPosition = 0;
var dataPosition = (width * tileTop + tileLeft) * componentsCount;
var imgRowSize = width * componentsCount;
var tileRowSize = tileWidth * componentsCount;
for (var j = 0; j < tileHeight; j++) {
var rowBytes = src.subarray(srcPosition, srcPosition + tileRowSize);
data.set(rowBytes, dataPosition);
srcPosition += tileRowSize;
dataPosition += imgRowSize;
}
}
this.buffer = data;
}
this.bufferLength = this.buffer.length;
this.eof = true;
};
return JpxStream;
})();
var DecryptStream = (function DecryptStreamClosure() {
function DecryptStream(str, maybeLength, decrypt) {
this.str = str;
@ -1414,8 +1251,6 @@ export {
DecryptStream,
DecodeStream,
FlateStream,
JpegStream,
JpxStream,
NullStream,
PredictorStream,
RunLengthStream,