33 lines
1.1 KiB
TypeScript
33 lines
1.1 KiB
TypeScript
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import { IDimensions } from '../classes/Dimensions';
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import { env } from '../env';
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import { getContext2dOrThrow } from './getContext2dOrThrow';
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import { getMediaDimensions } from './getMediaDimensions';
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import { isMediaLoaded } from './isMediaLoaded';
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export function createCanvas({ width, height }: IDimensions): HTMLCanvasElement {
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const { createCanvasElement } = env.getEnv()
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const canvas = createCanvasElement()
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canvas.width = width
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canvas.height = height
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return canvas
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}
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export function createCanvasFromMedia(media: HTMLImageElement | HTMLVideoElement | ImageData, dims?: IDimensions): HTMLCanvasElement {
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const { ImageData } = env.getEnv()
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if (!(media instanceof ImageData) && !isMediaLoaded(media)) {
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throw new Error('createCanvasFromMedia - media has not finished loading yet')
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}
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const { width, height } = dims || getMediaDimensions(media)
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const canvas = createCanvas({ width, height })
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if (media instanceof ImageData) {
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getContext2dOrThrow(canvas).putImageData(media, 0, 0)
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} else {
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getContext2dOrThrow(canvas).drawImage(media, 0, 0, width, height)
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}
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return canvas
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}
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