85 lines
2.4 KiB
TypeScript
85 lines
2.4 KiB
TypeScript
const IMAGE_UPLOAD_MAX_SIDE: Record<string, number> = {
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avatar: 512,
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chat: 1280,
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'home-banner': 1920,
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listing: 1920,
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dispute: 1920,
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handoff: 1920,
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realname: 1920,
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}
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const IMAGE_UPLOAD_QUALITY: Record<string, number> = {
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avatar: 0.82,
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chat: 0.8,
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'home-banner': 0.84,
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listing: 0.84,
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dispute: 0.86,
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handoff: 0.86,
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realname: 0.86,
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}
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export async function optimizeImageForUpload(file: File, scene: string) {
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if (!file.type.startsWith('image/')) return file
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if (!['image/jpeg', 'image/png', 'image/webp'].includes(file.type)) return file
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if (typeof document === 'undefined') return file
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try {
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const image = await loadImage(file)
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const maxSide = IMAGE_UPLOAD_MAX_SIDE[scene] || 1600
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const quality = IMAGE_UPLOAD_QUALITY[scene] || 0.82
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const { width, height } = fitSize(image.naturalWidth, image.naturalHeight, maxSide)
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const canvas = document.createElement('canvas')
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canvas.width = width
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canvas.height = height
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const context = canvas.getContext('2d')
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if (!context) return file
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context.fillStyle = '#ffffff'
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context.fillRect(0, 0, width, height)
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context.drawImage(image, 0, 0, width, height)
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const blob = await canvasToBlob(canvas, 'image/webp', quality)
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if (!blob || blob.size >= file.size) return file
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return new File([blob], replaceFileExt(file.name, 'webp'), {
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type: 'image/webp',
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lastModified: Date.now(),
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})
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} catch {
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return file
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}
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}
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function loadImage(file: File) {
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return new Promise<HTMLImageElement>((resolve, reject) => {
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const url = URL.createObjectURL(file)
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const image = new Image()
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image.onload = () => {
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URL.revokeObjectURL(url)
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resolve(image)
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}
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image.onerror = () => {
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URL.revokeObjectURL(url)
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reject(new Error('图片读取失败'))
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}
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image.src = url
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})
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}
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function fitSize(width: number, height: number, maxSide: number) {
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if (width <= 0 || height <= 0) return { width: 1, height: 1 }
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const scale = Math.min(1, maxSide / Math.max(width, height))
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return {
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width: Math.max(1, Math.round(width * scale)),
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height: Math.max(1, Math.round(height * scale)),
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}
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}
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function canvasToBlob(canvas: HTMLCanvasElement, type: string, quality: number) {
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return new Promise<Blob | null>(resolve => {
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canvas.toBlob(resolve, type, quality)
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})
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}
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function replaceFileExt(filename: string, ext: string) {
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const base = filename.replace(/\.[^.]+$/, '')
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return `${base || 'image'}.${ext}`
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}
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