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Implement progressive loading of PDFs

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This commit is contained in:
Mack Duan 2013-02-06 15:19:29 -08:00
parent added3da8f
commit ef423ef30c
25 changed files with 2110 additions and 586 deletions
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12
src/evaluator.js
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@ -19,7 +19,7 @@
IDENTITY_MATRIX, info, isArray, isCmd, isDict, isEOF, isName, isNum,
isStream, isString, JpegStream, Lexer, Metrics, Name, Parser,
Pattern, PDFImage, PDFJS, serifFonts, stdFontMap, symbolsFonts,
TilingPattern, TODO, warn, Util */
TilingPattern, TODO, warn, Util, MissingDataException */
'use strict';
@ -155,10 +155,9 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
assert(fontRes, 'fontRes not available');
++this.fontIdCounter;
font = xref.fetchIfRef(font) || fontRes.get(fontName);
if (!isDict(font)) {
++this.fontIdCounter;
return {
translated: new ErrorFont('Font ' + fontName + ' is not available'),
loadedName: 'g_font_' + this.uniquePrefix + this.fontIdCounter
@ -169,7 +168,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
if (!loadedName) {
// keep track of each font we translated so the caller can
// load them asynchronously before calling display on a page
loadedName = 'g_font_' + this.uniquePrefix + this.fontIdCounter;
loadedName = 'g_font_' + this.uniquePrefix + (this.fontIdCounter + 1);
font.loadedName = loadedName;
var translated;
@ -177,6 +176,10 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
translated = this.translateFont(font, xref, resources,
dependency);
} catch (e) {
if (e instanceof MissingDataException) {
font.loadedName = undefined;
throw e;
}
translated = new ErrorFont(e instanceof Error ? e.message : e);
}
font.translated = translated;
@ -196,6 +199,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
data.charProcOperatorList = charProcOperatorList;
}
}
++this.fontIdCounter;
return font;
},