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Make createCanvasContext2D work in non-window context

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This commit is contained in:
Andreas Hocevar
2020-03-04 16:02:07 +01:00
parent f896d9fb03
commit 717b8ad0cf
1 changed files with 7 additions and 2 deletions
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src/ol/dom.js
+7 -2
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@@ -3,6 +3,7 @@
*/ */
//FIXME Move this function to the canvas module
/** /**
* Create an html canvas element and returns its 2d context. * Create an html canvas element and returns its 2d context.
* @param {number=} opt_width Canvas width. * @param {number=} opt_width Canvas width.
@@ -12,14 +13,18 @@
*/ */
export function createCanvasContext2D(opt_width, opt_height, opt_canvasPool) { export function createCanvasContext2D(opt_width, opt_height, opt_canvasPool) {
const canvas = opt_canvasPool && opt_canvasPool.length ? const canvas = opt_canvasPool && opt_canvasPool.length ?
opt_canvasPool.shift() : document.createElement('canvas'); opt_canvasPool.shift() :
'document' in self ?
document.createElement('canvas') :
new OffscreenCanvas(opt_width || 300, opt_height || 300);
if (opt_width) { if (opt_width) {
canvas.width = opt_width; canvas.width = opt_width;
} }
if (opt_height) { if (opt_height) {
canvas.height = opt_height; canvas.height = opt_height;
} }
return canvas.getContext('2d'); //FIXME Allow OffscreenCanvasRenderingContext2D as return type
return /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
} }