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[api-minor] Refactor fetching of built-in CMaps to utilize a factory on the display side instead, to allow users of the API to provide a custom CMap loading factory (e.g. for use with Node.js)

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Currently the built-in CMap files are loaded in `src/core/cmap.js` using `XMLHttpRequest` directly. For some environments that might be a problem, hence this patch refactors that to instead use a factory to load built-in CMaps on the main thread and message the data to the worker thread.

This is inspired by other recent work, e.g. the addition of the `CanvasFactory`, and to a large extent on the IRC discussion starting at http://logs.glob.uno/?c=mozilla%23pdfjs&s=12+Oct+2016&e=12+Oct+2016#c53010.
This commit is contained in:
Jonas Jenwald 2017-02-12 15:54:41 +01:00
parent b509a3f83c
commit 769c1450b7
10 changed files with 211 additions and 111 deletions
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7
src/shared/util.js
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@ -156,6 +156,12 @@ var VERBOSITY_LEVELS = {
infos: 5
};
var CMapCompressionType = {
NONE: 0,
BINARY: 1,
STREAM: 2,
};
// All the possible operations for an operator list.
var OPS = {
// Intentionally start from 1 so it is easy to spot bad operators that will be
@ -2411,6 +2417,7 @@ exports.AnnotationFlag = AnnotationFlag;
exports.AnnotationType = AnnotationType;
exports.FontType = FontType;
exports.ImageKind = ImageKind;
exports.CMapCompressionType = CMapCompressionType;
exports.InvalidPDFException = InvalidPDFException;
exports.MessageHandler = MessageHandler;
exports.MissingDataException = MissingDataException;