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blob: 7b5717a736f4871c1853691c5b3ea4758611795c (600 bytes)[doc][blame][raw]

 1const DEVICE_PIXEL_RATIO = window.devicePixelRatio || 1;
 2
 3export function scaleCanvas(canvas, width, height) {
 4	const g = canvas.getContext('2d');
 5	const backingStoreRatio = g.webkitBackingStorePixelRatio || 1;
 6	const ratio = DEVICE_PIXEL_RATIO / backingStoreRatio;
 7	if(DEVICE_PIXEL_RATIO != backingStoreRatio) {
 8		canvas.width = width * ratio;
 9		canvas.height = height * ratio;
10		canvas.style.width = width + 'px';
11		canvas.style.height = height + 'px';
12	}
13	else {
14		canvas.width = width;
15		canvas.height = height;
16		canvas.style.width = '';
17		canvas.style.height = '';
18	}
19	g.scale(ratio, ratio);
20}