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Move NativeImageDecoder into a separate file, and convert it to a class

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Given the size of the `src/core/evaluator.js` file, it cannot hurt to move some of its (image related) helper functionality into a separate file.
This commit is contained in:
Jonas Jenwald 2019-02-25 12:04:51 +01:00
parent e41c4aece4
commit 2665502055
2 changed files with 87 additions and 62 deletions
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64
src/core/evaluator.js
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@ -20,7 +20,6 @@ import {
UNSUPPORTED_FEATURES, Util, warn
} from '../shared/util';
import { CMapFactory, IdentityCMap } from './cmap';
import { DecodeStream, Stream } from './stream';
import {
Dict, isCmd, isDict, isEOF, isName, isRef, isStream, Name
} from './primitives';
@ -41,12 +40,14 @@ import { getTilingPatternIR, Pattern } from './pattern';
import { Lexer, Parser } from './parser';
import { bidi } from './bidi';
import { ColorSpace } from './colorspace';
import { DecodeStream } from './stream';
import { getGlyphsUnicode } from './glyphlist';
import { getLookupTableFactory } from './core_utils';
import { getMetrics } from './metrics';
import { isPDFFunction } from './function';
import { JpegStream } from './jpeg_stream';
import { MurmurHash3_64 } from './murmurhash3';
import { NativeImageDecoder } from './image_utils';
import { OperatorList } from './operator_list';
import { PDFImage } from './image';
@ -60,67 +61,6 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
isEvalSupported: true,
};
function NativeImageDecoder({ xref, resources, handler,
forceDataSchema = false,
pdfFunctionFactory, }) {
this.xref = xref;
this.resources = resources;
this.handler = handler;
this.forceDataSchema = forceDataSchema;
this.pdfFunctionFactory = pdfFunctionFactory;
}
NativeImageDecoder.prototype = {
canDecode(image) {
return image instanceof JpegStream &&
NativeImageDecoder.isDecodable(image, this.xref, this.resources,
this.pdfFunctionFactory);
},
decode(image) {
// For natively supported JPEGs send them to the main thread for decoding.
var dict = image.dict;
var colorSpace = dict.get('ColorSpace', 'CS');
colorSpace = ColorSpace.parse(colorSpace, this.xref, this.resources,
this.pdfFunctionFactory);
return this.handler.sendWithPromise('JpegDecode', [
image.getIR(this.forceDataSchema), colorSpace.numComps
]).then(function({ data, width, height, }) {
return new Stream(data, 0, data.length, image.dict);
});
},
};
/**
* Checks if the image can be decoded and displayed by the browser without any
* further processing such as color space conversions.
*/
NativeImageDecoder.isSupported = function(image, xref, res,
pdfFunctionFactory) {
var dict = image.dict;
if (dict.has('DecodeParms') || dict.has('DP')) {
return false;
}
var cs = ColorSpace.parse(dict.get('ColorSpace', 'CS'), xref, res,
pdfFunctionFactory);
// isDefaultDecode() of DeviceGray and DeviceRGB needs no `bpc` argument.
return (cs.name === 'DeviceGray' || cs.name === 'DeviceRGB') &&
cs.isDefaultDecode(dict.getArray('Decode', 'D'));
};
/**
* Checks if the image can be decoded by the browser.
*/
NativeImageDecoder.isDecodable = function(image, xref, res,
pdfFunctionFactory) {
var dict = image.dict;
if (dict.has('DecodeParms') || dict.has('DP')) {
return false;
}
var cs = ColorSpace.parse(dict.get('ColorSpace', 'CS'), xref, res,
pdfFunctionFactory);
const bpc = dict.get('BitsPerComponent', 'BPC') || 1;
return (cs.numComps === 1 || cs.numComps === 3) &&
cs.isDefaultDecode(dict.getArray('Decode', 'D'), bpc);
};
function PartialEvaluator({ pdfManager, xref, handler, pageIndex, idFactory,
fontCache, builtInCMapCache, options = null,
pdfFunctionFactory, }) {