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Merge pull request #14359 from Snuffleupagus/PAUSE_EAGER_PAGE_INIT

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Avoid overloading the worker-thread during eager page initialization in the viewer (PR 11263 follow-up)
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Tim van der Meij 2021-12-11 13:28:35 +01:00 committed by GitHub
commit 3a8318aa1c
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1 changed files with 7 additions and 2 deletions
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web/base_viewer.js
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@ -57,6 +57,7 @@ const DEFAULT_CACHE_SIZE = 10;
const PagesCountLimit = { const PagesCountLimit = {
FORCE_SCROLL_MODE_PAGE: 15000, FORCE_SCROLL_MODE_PAGE: 15000,
FORCE_LAZY_PAGE_INIT: 7500, FORCE_LAZY_PAGE_INIT: 7500,
PAUSE_EAGER_PAGE_INIT: 500,
}; };
/** /**
@ -625,7 +626,7 @@ class BaseViewer {
// Fetch all the pages since the viewport is needed before printing // Fetch all the pages since the viewport is needed before printing
// starts to create the correct size canvas. Wait until one page is // starts to create the correct size canvas. Wait until one page is
// rendered so we don't tie up too many resources early on. // rendered so we don't tie up too many resources early on.
this._onePageRenderedOrForceFetch().then(() => { this._onePageRenderedOrForceFetch().then(async () => {
if (this.findController) { if (this.findController) {
this.findController.setDocument(pdfDocument); // Enable searching. this.findController.setDocument(pdfDocument); // Enable searching.
} }
@ -650,7 +651,7 @@ class BaseViewer {
return; return;
} }
for (let pageNum = 2; pageNum <= pagesCount; ++pageNum) { for (let pageNum = 2; pageNum <= pagesCount; ++pageNum) {
pdfDocument.getPage(pageNum).then( const promise = pdfDocument.getPage(pageNum).then(
pdfPage => { pdfPage => {
const pageView = this._pages[pageNum - 1]; const pageView = this._pages[pageNum - 1];
if (!pageView.pdfPage) { if (!pageView.pdfPage) {
@ -671,6 +672,10 @@ class BaseViewer {
} }
} }
); );
if (pageNum % PagesCountLimit.PAUSE_EAGER_PAGE_INIT === 0) {
await promise;
}
} }
}); });