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import {Dimensions} from './types'
export function extractDataUriMime(uri: string): string {
return uri.substring(uri.indexOf(':') + 1, uri.indexOf(';'))
}
// Fairly accurate estimate that is more performant
// than decoding and checking length of URI
export function getDataUriSize(uri: string): number {
return Math.round((uri.length * 3) / 4)
}
export function scaleDownDimensions(
dim: Dimensions,
max: Dimensions,
): Dimensions {
if (dim.width < max.width && dim.height < max.height) {
return dim
}
const wScale = dim.width > max.width ? max.width / dim.width : 1
const hScale = dim.height > max.height ? max.height / dim.height : 1
if (wScale < hScale) {
return {width: dim.width * wScale, height: dim.height * wScale}
}
return {width: dim.width * hScale, height: dim.height * hScale}
}
export function isUriImage(uri: string) {
return /\.(jpg|jpeg|png).*$/.test(uri)
}
export function blobToDataUri(blob: Blob): Promise<string> {
return new Promise((resolve, reject) => {
const reader = new FileReader()
reader.onloadend = () => {
if (typeof reader.result === 'string') {
resolve(reader.result)
} else {
reject(new Error('Failed to read blob'))
}
}
reader.onerror = reject
reader.readAsDataURL(blob)
})
}
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