40 lines
1.1 KiB
TypeScript
40 lines
1.1 KiB
TypeScript
export async function createImageFromDataURL(dataURL: string)
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: Promise<HTMLImageElement> {
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return new Promise((resolve, reject) => {
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const image = new Image()
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image.onload = () => resolve(image)
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image.onerror = () => reject(new Error('Error reading image!'))
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image.src = dataURL
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})
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}
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export async function drawCanvasFromDataURL(dataURL: string)
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: Promise<HTMLCanvasElement> {
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const canvas = document.createElement('canvas')
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const ctx = canvas.getContext('2d')!
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const image = await createImageFromDataURL(dataURL)
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canvas.width = image.width
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canvas.height = image.height
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ctx.drawImage(image, 0, 0)
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return canvas
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}
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export async function getCanvasFromArrayBuffer(
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arrayBuffer: ArrayBuffer,
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width: number,
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height: number,
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) {
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return new Promise((resolve, reject) => {
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const canvas = document.createElement('canvas')
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const ctx = canvas.getContext('2d')!
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const imageData = new ImageData(
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new Uint8ClampedArray(arrayBuffer),
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width,
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height,
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)
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canvas.width = width
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canvas.height = height
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ctx.putImageData(imageData, 0, 0)
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})
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}
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