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Uses rAF to interrupt the operator list execution

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This commit is contained in:
Yury Delendik 2014-05-09 07:00:47 -05:00
parent abc924b5af
commit c5eb058b09
4 changed files with 28 additions and 18 deletions
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16
src/display/api.js
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@ -1271,6 +1271,10 @@ var InternalRenderTask = (function InternalRenderTaskClosure() {
this.graphicsReady = false;
this.cancelled = false;
this.capability = createPromiseCapability();
// caching this-bound methods
this._continueBound = this._continue.bind(this);
this._scheduleNextBound = this._scheduleNext.bind(this);
this._nextBound = this._next.bind(this);
}
InternalRenderTask.prototype = {
@ -1309,7 +1313,7 @@ var InternalRenderTask = (function InternalRenderTaskClosure() {
operatorListChanged: function InternalRenderTask_operatorListChanged() {
if (!this.graphicsReady) {
if (!this.graphicsReadyCallback) {
this.graphicsReadyCallback = this._continue.bind(this);
this.graphicsReadyCallback = this._continueBound;
}
return;
}
@ -1330,19 +1334,23 @@ var InternalRenderTask = (function InternalRenderTaskClosure() {
return;
}
if (this.params.continueCallback) {
this.params.continueCallback(this._next.bind(this));
this.params.continueCallback(this._scheduleNextBound);
} else {
this._next();
this._scheduleNext();
}
},
_scheduleNext: function InternalRenderTask__scheduleNext() {
window.requestAnimationFrame(this._nextBound);
},
_next: function InternalRenderTask__next() {
if (this.cancelled) {
return;
}
this.operatorListIdx = this.gfx.executeOperatorList(this.operatorList,
this.operatorListIdx,
this._continue.bind(this),
this._continueBound,
this.stepper);
if (this.operatorListIdx === this.operatorList.argsArray.length) {
this.running = false;

8
src/display/canvas.js
View File

@ -746,7 +746,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var commonObjs = this.commonObjs;
var objs = this.objs;
var fnId;
var deferred = Promise.resolve();
while (true) {
if (stepper && i === stepper.nextBreakPoint) {
@ -784,11 +783,10 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
return i;
}
// If the execution took longer then a certain amount of time, schedule
// to continue exeution after a short delay.
// However, this is only possible if a 'continueCallback' is passed in.
// If the execution took longer then a certain amount of time and
// `continueCallback` is specified, interrupt the execution.
if (continueCallback && Date.now() > endTime) {
deferred.then(continueCallback);
continueCallback();
return i;
}

12
web/compatibility.js
View File

@ -564,3 +564,15 @@ if (typeof PDFJS === 'undefined') {
console.log('Unable to create polyfill for localStorage');
}
})();
(function checkRequestAnimationFrame() {
if ('requestAnimationFrame' in window) {
return;
}
window.requestAnimationFrame =
window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame ||
window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
(function fakeRequestAnimationFrame(callback) {
window.setTimeout(callback, 20);
});
})();

10
web/viewer.js
View File

@ -2410,16 +2410,8 @@ window.addEventListener('afterprint', function afterPrint(evt) {
(function animationStartedClosure() {
// The offsetParent is not set until the pdf.js iframe or object is visible.
// Waiting for first animation.
var requestAnimationFrame = window.requestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function startAtOnce(callback) { callback(); };
PDFView.animationStartedPromise = new Promise(function (resolve) {
requestAnimationFrame(function onAnimationFrame() {
resolve();
});
window.requestAnimationFrame(resolve);
});
})();