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Merge pull request #8210 from Snuffleupagus/issue-8209

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Refactor removing of the `zoomLayer` into a helper method, and use that in `PDFPageView.reset` to ensure that the entire `zoomLayer` is actually removed (issue 8209)
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Tim van der Meij 2017-03-30 23:19:08 +02:00 committed by GitHub
commit 57d9a64c14
1 changed files with 32 additions and 25 deletions
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57
web/pdf_page_view.js
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@ -133,13 +133,33 @@ var PDFPageView = (function PDFPageViewClosure() {
}, },
destroy: function PDFPageView_destroy() { destroy: function PDFPageView_destroy() {
this.zoomLayer = null;
this.reset(); this.reset();
if (this.pdfPage) { if (this.pdfPage) {
this.pdfPage.cleanup(); this.pdfPage.cleanup();
} }
}, },
/**
* @private
*/
_resetZoomLayer: function(removeFromDOM) {
if (!this.zoomLayer) {
return;
}
var zoomLayerCanvas = this.zoomLayer.firstChild;
this.paintedViewportMap.delete(zoomLayerCanvas);
// Zeroing the width and height causes Firefox to release graphics
// resources immediately, which can greatly reduce memory consumption.
zoomLayerCanvas.width = 0;
zoomLayerCanvas.height = 0;
if (removeFromDOM) {
// Note: ChildNode.remove doesn't throw if the parentNode is undefined.
this.zoomLayer.remove();
}
this.zoomLayer = null;
},
reset: function PDFPageView_reset(keepZoomLayer, keepAnnotations) { reset: function PDFPageView_reset(keepZoomLayer, keepAnnotations) {
this.cancelRendering(); this.cancelRendering();
@ -168,13 +188,16 @@ var PDFPageView = (function PDFPageViewClosure() {
this.annotationLayer = null; this.annotationLayer = null;
} }
if (this.canvas && !currentZoomLayerNode) { if (!currentZoomLayerNode) {
this.paintedViewportMap.delete(this.canvas); if (this.canvas) {
// Zeroing the width and height causes Firefox to release graphics this.paintedViewportMap.delete(this.canvas);
// resources immediately, which can greatly reduce memory consumption. // Zeroing the width and height causes Firefox to release graphics
this.canvas.width = 0; // resources immediately, which can greatly reduce memory consumption.
this.canvas.height = 0; this.canvas.width = 0;
delete this.canvas; this.canvas.height = 0;
delete this.canvas;
}
this._resetZoomLayer();
} }
if (this.svg) { if (this.svg) {
this.paintedViewportMap.delete(this.svg); this.paintedViewportMap.delete(this.svg);
@ -429,23 +452,7 @@ var PDFPageView = (function PDFPageViewClosure() {
div.removeChild(self.loadingIconDiv); div.removeChild(self.loadingIconDiv);
delete self.loadingIconDiv; delete self.loadingIconDiv;
} }
self._resetZoomLayer(/* removeFromDOM = */ true);
if (self.zoomLayer) {
var zoomLayerCanvas = self.zoomLayer.firstChild;
self.paintedViewportMap.delete(zoomLayerCanvas);
// Zeroing the width and height causes Firefox to release graphics
// resources immediately, which can greatly reduce memory consumption.
zoomLayerCanvas.width = 0;
zoomLayerCanvas.height = 0;
if (div.contains(self.zoomLayer)) {
// Prevent "Node was not found" errors if the `zoomLayer` was
// already removed. This may occur intermittently if the scale
// changes many times in very quick succession.
div.removeChild(self.zoomLayer);
}
self.zoomLayer = null;
}
self.error = error; self.error = error;
self.stats = pdfPage.stats; self.stats = pdfPage.stats;