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Merge pull request #18627 from richard-smith-preservica/rcs/send-page-dict-requests-in-parallel

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Send fetch requests for all page dict lookups in parallel
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Jonas Jenwald 2024-08-21 13:58:03 +02:00 • committed by GitHub
commit 908f453384
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1 changed files with 18 additions and 3 deletions
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src/core/catalog.js
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@ -143,6 +143,7 @@ class Catalog {
this.globalImageCache = new GlobalImageCache(); this.globalImageCache = new GlobalImageCache();
this.pageKidsCountCache = new RefSetCache(); this.pageKidsCountCache = new RefSetCache();
this.pageIndexCache = new RefSetCache(); this.pageIndexCache = new RefSetCache();
this.pageDictCache = new RefSetCache();
this.nonBlendModesSet = new RefSet(); this.nonBlendModesSet = new RefSet();
this.systemFontCache = new Map(); this.systemFontCache = new Map();
} }
@ -1161,6 +1162,7 @@ class Catalog {
this.globalImageCache.clear(/* onlyData = */ manuallyTriggered); this.globalImageCache.clear(/* onlyData = */ manuallyTriggered);
this.pageKidsCountCache.clear(); this.pageKidsCountCache.clear();
this.pageIndexCache.clear(); this.pageIndexCache.clear();
this.pageDictCache.clear();
this.nonBlendModesSet.clear(); this.nonBlendModesSet.clear();
const translatedFonts = await Promise.all(this.fontCache); const translatedFonts = await Promise.all(this.fontCache);
@ -1184,7 +1186,8 @@ class Catalog {
} }
const xref = this.xref, const xref = this.xref,
pageKidsCountCache = this.pageKidsCountCache, pageKidsCountCache = this.pageKidsCountCache,
pageIndexCache = this.pageIndexCache; pageIndexCache = this.pageIndexCache,
pageDictCache = this.pageDictCache;
let currentPageIndex = 0; let currentPageIndex = 0;
while (nodesToVisit.length) { while (nodesToVisit.length) {
@ -1203,7 +1206,8 @@ class Catalog {
} }
visitedNodes.put(currentNode); visitedNodes.put(currentNode);
const obj = await xref.fetchAsync(currentNode); const obj = await (pageDictCache.get(currentNode) ||
xref.fetchAsync(currentNode));
if (obj instanceof Dict) { if (obj instanceof Dict) {
let type = obj.getRaw("Type"); let type = obj.getRaw("Type");
if (type instanceof Ref) { if (type instanceof Ref) {
@ -1285,7 +1289,18 @@ class Catalog {
// node further down in the tree (see issue5644.pdf, issue8088.pdf), // node further down in the tree (see issue5644.pdf, issue8088.pdf),
// and to ensure that we actually find the correct `Page` dict. // and to ensure that we actually find the correct `Page` dict.
for (let last = kids.length - 1; last >= 0; last--) { for (let last = kids.length - 1; last >= 0; last--) {
nodesToVisit.push(kids[last]); const lastKid = kids[last];
nodesToVisit.push(lastKid);
// Launch all requests in parallel so we don't wait for each one in turn
// when looking for a page near the end, if all the pages are top level.
if (
currentNode === this.toplevelPagesDict &&
lastKid instanceof Ref &&
!pageDictCache.has(lastKid)
) {
pageDictCache.put(lastKid, xref.fetchAsync(lastKid));
}
} }
} }