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export const createImage = (url: string) =>
new Promise<HTMLImageElement>((resolve, reject) => {
const image = new Image()
image.addEventListener('load', () => resolve(image))
image.addEventListener('error', error => reject(error))
image.setAttribute('crossOrigin', 'anonymous') // needed to avoid cross-origin issues on CodeSandbox
image.src = url
})
export function getRadianAngle(degreeValue: number) {
return (degreeValue * Math.PI) / 180
}
export function getMimeType(fileName: string): string {
const extension = fileName.split('.').pop()?.toLowerCase()
switch (extension) {
case 'png':
return 'image/png'
case 'jpg':
case 'jpeg':
return 'image/jpeg'
case 'gif':
return 'image/gif'
case 'webp':
return 'image/webp'
default:
return 'image/jpeg'
}
}
/**
* Returns the new bounding area of a rotated rectangle.
*/
export function rotateSize(width: number, height: number, rotation: number) {
const rotRad = getRadianAngle(rotation)
return {
width:
Math.abs(Math.cos(rotRad) * width) + Math.abs(Math.sin(rotRad) * height),
height:
Math.abs(Math.sin(rotRad) * width) + Math.abs(Math.cos(rotRad) * height),
}
}
/**
* This function was adapted from the one in the ReadMe of https://github.com/DominicTobias/react-image-crop
*/
export default async function getCroppedImg(
imageSrc: string,
pixelCrop: { x: number; y: number; width: number; height: number },
fileName: string,
rotation = 0,
flip = { horizontal: false, vertical: false },
): Promise<Blob> {
const image = await createImage(imageSrc)
const canvas = document.createElement('canvas')
const ctx = canvas.getContext('2d')
const mimeType = getMimeType(fileName)
if (!ctx)
throw new Error('Could not create a canvas context')
const rotRad = getRadianAngle(rotation)
// calculate bounding box of the rotated image
const { width: bBoxWidth, height: bBoxHeight } = rotateSize(
image.width,
image.height,
rotation,
)
// set canvas size to match the bounding box
canvas.width = bBoxWidth
canvas.height = bBoxHeight
// translate canvas context to a central location to allow rotating and flipping around the center
ctx.translate(bBoxWidth / 2, bBoxHeight / 2)
ctx.rotate(rotRad)
ctx.scale(flip.horizontal ? -1 : 1, flip.vertical ? -1 : 1)
ctx.translate(-image.width / 2, -image.height / 2)
// draw rotated image
ctx.drawImage(image, 0, 0)
const croppedCanvas = document.createElement('canvas')
const croppedCtx = croppedCanvas.getContext('2d')
if (!croppedCtx)
throw new Error('Could not create a canvas context')
// Set the size of the cropped canvas
croppedCanvas.width = pixelCrop.width
croppedCanvas.height = pixelCrop.height
// Draw the cropped image onto the new canvas
croppedCtx.drawImage(
canvas,
pixelCrop.x,
pixelCrop.y,
pixelCrop.width,
pixelCrop.height,
0,
0,
pixelCrop.width,
pixelCrop.height,
)
return new Promise((resolve, reject) => {
croppedCanvas.toBlob((file) => {
if (file)
resolve(file)
else
reject(new Error('Could not create a blob'))
}, mimeType)
})
}
export function checkIsAnimatedImage(file) {
return new Promise((resolve, reject) => {
const fileReader = new FileReader()
fileReader.onload = function (e) {
const arr = new Uint8Array(e.target.result)
// Check file extension
const fileName = file.name.toLowerCase()
if (fileName.endsWith('.gif')) {
// If file is a GIF, assume it's animated
resolve(true)
}
// Check for WebP signature (RIFF and WEBP)
else if (isWebP(arr)) {
resolve(checkWebPAnimation(arr)) // Check if it's animated
}
else {
resolve(false) // Not a GIF or WebP
}
}
fileReader.onerror = function (err) {
reject(err) // Reject the promise on error
}
// Read the file as an array buffer
fileReader.readAsArrayBuffer(file)
})
}
// Function to check for WebP signature
function isWebP(arr) {
return (
arr[0] === 0x52 && arr[1] === 0x49 && arr[2] === 0x46 && arr[3] === 0x46
&& arr[8] === 0x57 && arr[9] === 0x45 && arr[10] === 0x42 && arr[11] === 0x50
) // "WEBP"
}
// Function to check if the WebP is animated (contains ANIM chunk)
function checkWebPAnimation(arr) {
// Search for the ANIM chunk in WebP to determine if it's animated
for (let i = 12; i < arr.length - 4; i++) {
if (arr[i] === 0x41 && arr[i + 1] === 0x4E && arr[i + 2] === 0x49 && arr[i + 3] === 0x4D)
return true // Found animation
}
return false // No animation chunk found
}
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