so://phie

blob: 82d371f4e53e381a4418be6834b95ef2e7dad0b4 (599 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);