Sakurai/pdf.js
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Add a cache system to limit the amount of ram used

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This commit is contained in:
Vivien Nicolas 2011-07-29 13:26:43 +02:00
parent e28e0669f9
commit 26bf2735fd
1 changed files with 23 additions and 5 deletions
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28
web/viewer.js
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@ -6,6 +6,19 @@
var kDefaultURL = 'compressed.tracemonkey-pldi-09.pdf'; var kDefaultURL = 'compressed.tracemonkey-pldi-09.pdf';
var kDefaultScale = 150; var kDefaultScale = 150;
var kCacheSize = 20;
var Cache = function(size) {
var data = [];
this.push = function(view) {
data.push(view);
if (data.length > size)
data.shift().update();
};
};
var cache = new Cache(kCacheSize);
var PDFView = { var PDFView = {
pages: [], pages: [],
thumbnails: [], thumbnails: [],
@ -121,7 +134,7 @@ var PDFView = {
var windowBottom = window.pageYOffset + window.innerHeight; var windowBottom = window.pageYOffset + window.innerHeight;
for (; i <= pages.length && currentHeight < windowBottom; i++) { for (; i <= pages.length && currentHeight < windowBottom; i++) {
var page = pages[i - 1]; var page = pages[i - 1];
visiblePages.push({ id: page.id, y: currentHeight }); visiblePages.push({ id: page.id, y: currentHeight, view: page });
currentHeight += page.height * page.scale + kBottomMargin; currentHeight += page.height * page.scale + kBottomMargin;
} }
@ -146,7 +159,7 @@ var PageView = function(container, content, id, width, height, stats) {
container.appendChild(div); container.appendChild(div);
this.update = function(scale) { this.update = function(scale) {
this.scale = scale; this.scale = scale || this.scale;
div.style.width = (this.width * this.scale)+ 'px'; div.style.width = (this.width * this.scale)+ 'px';
div.style.height = (this.height * this.scale) + 'px'; div.style.height = (this.height * this.scale) + 'px';
@ -157,7 +170,7 @@ var PageView = function(container, content, id, width, height, stats) {
this.draw = function() { this.draw = function() {
if (div.hasChildNodes()) { if (div.hasChildNodes()) {
this.updateStats(); this.updateStats();
return; return false;
} }
var canvas = document.createElement('canvas'); var canvas = document.createElement('canvas');
@ -176,6 +189,8 @@ var PageView = function(container, content, id, width, height, stats) {
stats.begin = Date.now(); stats.begin = Date.now();
this.content.startRendering(ctx, this.updateStats); this.content.startRendering(ctx, this.updateStats);
return true;
}; };
this.updateStats = function() { this.updateStats = function() {
@ -240,8 +255,11 @@ window.addEventListener('pdfloaded', function(evt) {
window.addEventListener('scroll', function(evt) { window.addEventListener('scroll', function(evt) {
var visiblePages = PDFView.getVisiblePages(); var visiblePages = PDFView.getVisiblePages();
for (var i = 0; i < visiblePages.length; i++) for (var i = 0; i < visiblePages.length; i++) {
PDFView.pages[visiblePages[i].id - 1].draw(); var page = visiblePages[i];
if (PDFView.pages[page.id - 1].draw())
cache.push(page.view);
}
if (!visiblePages.length) if (!visiblePages.length)
return; return;