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Add support for High DPI canvas #127

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Add support for High DPI canvas #127

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35 changes: 27 additions & 8 deletions lime/src/renderer/canvas.js
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,8 @@ lime.Renderer.CANVAS.drawCanvas = function() {

if (!this.domElement) return;

var context = this.domElement.getContext('2d');

if (this.boundsCache && this.boundsCache.contains(bounds) &&
(sizediff = this.boundsCache.size().area() / bounds.size().area()) &&
sizediff < 1.6 && sizediff > 0.5) {
Expand Down Expand Up @@ -69,17 +71,36 @@ lime.Renderer.CANVAS.drawCanvas = function() {

this.boundsCache = bounds; //save for later use

var bsize = bounds.size();
var pxsize = bsize.clone().ceil();
var bsize = bounds.size(),
pxsize = bsize.clone().ceil(),
width = this.domElement.width,
height = this.domElement.height;

if (this.pixelRatio) {
width /= this.pixelRatio;
height /= this.pixelRatio;
}

if (width != pxsize.width || height != pxsize.height) {

if (this.domElement.width != pxsize.width ||
this.domElement.height != pxsize.height) {
// High DPI canvas support: http://www.html5rocks.com/en/tutorials/canvas/hidpi/
var ratio = (goog.global['devicePixelRatio'] || 1) / (context.webkitBackingStorePixelRatio || 1);

if (ratio !== 1) {
this.domElement.width = pxsize.width * ratio;
this.domElement.height = pxsize.height * ratio;
this.domElement.style.width = pxsize.width + 'px';
this.domElement.style.height = pxsize.height + 'px';
context.scale(ratio, ratio);
this.pixelRatio = ratio;
} else {
this.domElement.width = pxsize.width;
this.domElement.height = pxsize.height;
this.redraw_ = 1;
// console.log('redraw');
}

this.redraw_ = 1;
}



var realScale = this.getScale().clone();
Expand Down Expand Up @@ -125,8 +146,6 @@ lime.Renderer.CANVAS.drawCanvas = function() {
}

if (this.redraw_) {
var context = this.domElement.getContext('2d');

context.clearRect(0, 0, pxsize.width, pxsize.height);
context.save();
context.translate(this.ax, this.ay);
Expand Down