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Preventing from using the same canvas for multiple render()

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This commit is contained in:
Yury Delendik 2017-06-12 16:04:35 -05:00
parent 0ca6132ad2
commit 24f14d44cb
2 changed files with 45 additions and 1 deletions
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20
src/display/api.js
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@ -901,7 +901,7 @@ var PDFPageProxy = (function PDFPageProxyClosure() {
stats.time('Rendering');
internalRenderTask.initializeGraphics(transparency);
internalRenderTask.operatorListChanged();
}, complete);
}).catch(complete);
return renderTask;
},
@ -2103,6 +2103,7 @@ var RenderTask = (function RenderTaskClosure() {
* @ignore
*/
var InternalRenderTask = (function InternalRenderTaskClosure() {
let canvasInRendering = new WeakMap();
function InternalRenderTask(callback, params, objs, commonObjs, operatorList,
pageNumber, canvasFactory) {
@ -2125,6 +2126,7 @@ var InternalRenderTask = (function InternalRenderTaskClosure() {
this._continueBound = this._continue.bind(this);
this._scheduleNextBound = this._scheduleNext.bind(this);
this._nextBound = this._next.bind(this);
this._canvas = params.canvasContext.canvas;
}
InternalRenderTask.prototype = {
@ -2132,6 +2134,16 @@ var InternalRenderTask = (function InternalRenderTaskClosure() {
initializeGraphics:
function InternalRenderTask_initializeGraphics(transparency) {
if (this._canvas) {
if (canvasInRendering.has(this._canvas)) {
throw new Error(
'Cannot use the same canvas during multiple render() operations. ' +
'Use different canvas or ensure previous operations were ' +
'cancelled or completed.');
}
canvasInRendering.set(this._canvas, this);
}
if (this.cancelled) {
return;
}
@ -2163,6 +2175,9 @@ var InternalRenderTask = (function InternalRenderTaskClosure() {
cancel: function InternalRenderTask_cancel() {
this.running = false;
this.cancelled = true;
if (this._canvas) {
canvasInRendering.delete(this._canvas);
}
if ((typeof PDFJSDev !== 'undefined' && PDFJSDev.test('PDFJS_NEXT')) ||
getDefaultSetting('pdfjsNext')) {
@ -2223,6 +2238,9 @@ var InternalRenderTask = (function InternalRenderTaskClosure() {
this.running = false;
if (this.operatorList.lastChunk) {
this.gfx.endDrawing();
if (this._canvas) {
canvasInRendering.delete(this._canvas);
}
this.callback();
}
}