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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,4 @@ | ||
| // 第三方库的类型定义 | ||
| // interface Window { | ||
| // UPNG: any | ||
| // } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| // @ts-expect-error | ||
| import UPNG from 'upng-js' | ||
| interface CompressOptions { | ||
| /** | ||
| * 压缩质量（0-100） | ||
| * @default 80 | ||
| */ | ||
| quality?: number | ||
| /** | ||
| * 压缩后更大是否使用原图 | ||
| * @default true | ||
| */ | ||
| noCompressIfLarger?: boolean | ||
| /** | ||
| * 压缩后的新宽度 | ||
| * @default 原尺寸 | ||
| */ | ||
| width?: number | ||
| /** | ||
| * 压缩后新高度 | ||
| * @default 原尺寸 | ||
| */ | ||
| height?: number | ||
| } | ||
| async function compressImage(file: File, ops: CompressOptions = {}) { | ||
| const { width, height, quality = 80, noCompressIfLarger } = ops | ||
| const isPng = await isPNG(file) | ||
| let newFile: File | null = null | ||
| if (isPng) { | ||
| const arrayBuffer = await getBlobArrayBuffer(file) | ||
| const decoded = UPNG.decode(arrayBuffer) | ||
| const rgba8 = UPNG.toRGBA8(decoded) | ||
| const compressed = UPNG.encode(rgba8, width || decoded.width, height || decoded.height, convertQualityToBit(quality)) | ||
| newFile = new File([compressed], file.name, { type: 'image/png' }) | ||
| } | ||
|
|
||
| if (!newFile) { | ||
| return file | ||
| } | ||
|
|
||
| if (!noCompressIfLarger) { | ||
| return newFile | ||
| } | ||
|
|
||
| return file.size > newFile.size ? newFile : file | ||
| } | ||
|
|
||
| function getBlobArrayBuffer(file: Blob): Promise<ArrayBuffer> { | ||
| return file.arrayBuffer() | ||
| } | ||
|
|
||
| async function isPNG(file: File) { | ||
| const arraybuffer = await getBlobArrayBuffer(file.slice(0, 8)) | ||
| return signatureEqual(arraybuffer, [137, 80, 78, 71, 13, 10, 26, 10]) | ||
| } | ||
|
|
||
| function signatureEqual(source: ArrayBuffer, signature: number[]) { | ||
| const array = new Uint8Array(source) | ||
| for (let i = 0; i < signature.length; i++) { | ||
| if (array[i] !== signature[i]) { | ||
| return false | ||
| } | ||
| } | ||
| return true | ||
| } | ||
|
|
||
| function getImageDimensions(file: File): Promise<{ width: number, height: number }> { | ||
| return new Promise ((resolve) => { | ||
| const img = new Image() | ||
| img.onload = function () { | ||
| resolve({ width: img.width, height: img.height }) | ||
| } | ||
| img.onerror = function () { | ||
| resolve({ width: 0, height: 0 }) | ||
| } | ||
| img.src = URL.createObjectURL(file) | ||
| }) | ||
| } | ||
|
|
||
| function convertQualityToBit(quality: number): number { | ||
| let bit = 0 | ||
| if (quality > 100 || quality < 0) { | ||
| bit = 0 | ||
| } | ||
| else { | ||
| bit = !quality ? 0 : quality * 256 * 0.01 | ||
| } | ||
| return bit | ||
| } | ||
|
|
||
| export { | ||
| compressImage, | ||
| getImageDimensions, | ||
| } |
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