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Added support for HiDPI displays

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This commit is contained in:
Kevin Kwok 2014-04-02 22:21:39 -04:00
parent 72dbefc5ad
commit 10627e56eb
1 changed files with 39 additions and 2 deletions
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41
services/web/public/js/libs/pdfListView/PdfListView.js
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@ -445,6 +445,7 @@ var RenderingStates = {
var idCounter = 0;
/**
* The view for a single page.
*/
@ -477,16 +478,30 @@ PageView.prototype = {
// Only change the width/height property of the canvas if it really
// changed. Every assignment to the width/height property clears the
// content of the canvas.
var outputScale = this.getOutputScale();
var scaledWidth = (Math.floor(viewport.width) * outputScale.sx) | 0;
var scaledHeight = (Math.floor(viewport.height) * outputScale.sy) | 0;
var newWidth = Math.floor(viewport.width);
var newHeight = Math.floor(viewport.height);
if (this.canvas.width !== newWidth) {
this.canvas.width = newWidth;
this.canvas.width = scaledWidth;
this.canvas.style.width = newWidth + 'px';
this.resetRenderState();
}
if (this.canvas.height !== newHeight) {
this.canvas.height = newHeight;
this.canvas.height = scaledHeight;
this.canvas.style.height = newHeight + 'px';
this.resetRenderState();
}
if(outputScale.scaled){
var ctx = this.getCanvasContext()
ctx.scale(outputScale.sx, outputScale.sy)
}
this.width = viewport.width;
this.height = viewport.height;
@ -523,6 +538,28 @@ PageView.prototype = {
return this.canvas.getContext('2d');
},
/**
* Returns scale factor for the canvas. It makes sense for the HiDPI displays.
* @return {Object} The object with horizontal (sx) and vertical (sy)
scales. The scaled property is set to false if scaling is
not required, true otherwise.
*/
getOutputScale: function(){
var ctx = this.getCanvasContext()
var devicePixelRatio = window.devicePixelRatio || 1;
var backingStoreRatio = ctx.webkitBackingStorePixelRatio ||
ctx.mozBackingStorePixelRatio ||
ctx.msBackingStorePixelRatio ||
ctx.oBackingStorePixelRatio ||
ctx.backingStorePixelRatio || 1;
var pixelRatio = devicePixelRatio / backingStoreRatio;
return {
sx: pixelRatio,
sy: pixelRatio,
scaled: pixelRatio != 1
};
},
createNewCanvas: function() {
if (this.canvas) {
this.dom.removeChild(this.canvas);