145 lines
4.3 KiB
TypeScript
145 lines
4.3 KiB
TypeScript
import { copy, remove } from 'fs-extra/esm'
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import { readFile, rename } from 'fs/promises'
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import { ColorActionName } from '@jimp/plugin-color'
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import { buildUUID, getLowercaseExtension } from '@peertube/peertube-node-utils'
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import { convertWebPToJPG, processGIF } from './ffmpeg/index.js'
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import { logger } from './logger.js'
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import type Jimp from 'jimp'
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export function generateImageFilename (extension = '.jpg') {
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return buildUUID() + extension
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}
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export async function processImage (options: {
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path: string
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destination: string
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newSize: { width: number, height: number }
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keepOriginal?: boolean // default false
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}) {
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const { path, destination, newSize, keepOriginal = false } = options
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const extension = getLowercaseExtension(path)
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if (path === destination) {
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throw new Error('Jimp/FFmpeg needs an input path different that the output path.')
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}
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logger.debug('Processing image %s to %s.', path, destination)
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// Use FFmpeg to process GIF
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if (extension === '.gif') {
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await processGIF({ path, destination, newSize })
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} else {
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await jimpProcessor(path, destination, newSize, extension)
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}
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if (keepOriginal !== true) await remove(path)
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logger.debug('Finished processing image %s to %s.', path, destination)
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}
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export async function getImageSize (path: string) {
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const inputBuffer = await readFile(path)
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const Jimp = await import('jimp')
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const image = await Jimp.default.read(inputBuffer)
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return {
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width: image.getWidth(),
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height: image.getHeight()
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}
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}
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// ---------------------------------------------------------------------------
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// Private
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// ---------------------------------------------------------------------------
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async function jimpProcessor (path: string, destination: string, newSize: { width: number, height: number }, inputExt: string) {
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let sourceImage: Jimp
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const inputBuffer = await readFile(path)
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const Jimp = await import('jimp')
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try {
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sourceImage = await Jimp.default.read(inputBuffer)
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} catch (err) {
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logger.debug('Cannot read %s with jimp. Try to convert the image using ffmpeg first.', path, { err })
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const newName = path + '.jpg'
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await convertWebPToJPG({ path, destination: newName })
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await rename(newName, path)
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sourceImage = await Jimp.default.read(path)
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}
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await remove(destination)
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// Optimization if the source file has the appropriate size
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const outputExt = getLowercaseExtension(destination)
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if (skipProcessing({ sourceImage, newSize, imageBytes: inputBuffer.byteLength, inputExt, outputExt })) {
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return copy(path, destination)
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}
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await autoResize({ sourceImage, newSize, destination })
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}
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async function autoResize (options: {
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sourceImage: Jimp
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newSize: { width: number, height: number }
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destination: string
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}) {
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const { sourceImage, newSize, destination } = options
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// Portrait mode targeting a landscape, apply some effect on the image
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const sourceIsPortrait = sourceImage.getWidth() < sourceImage.getHeight()
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const destIsPortraitOrSquare = newSize.width <= newSize.height
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removeExif(sourceImage)
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if (sourceIsPortrait && !destIsPortraitOrSquare) {
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const baseImage = sourceImage.cloneQuiet().cover(newSize.width, newSize.height)
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.color([ { apply: ColorActionName.SHADE, params: [ 50 ] } ])
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const topImage = sourceImage.cloneQuiet().contain(newSize.width, newSize.height)
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return write(baseImage.blit(topImage, 0, 0), destination)
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}
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return write(sourceImage.cover(newSize.width, newSize.height), destination)
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}
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function write (image: Jimp, destination: string) {
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return image.quality(80).writeAsync(destination)
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}
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function skipProcessing (options: {
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sourceImage: Jimp
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newSize: { width: number, height: number }
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imageBytes: number
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inputExt: string
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outputExt: string
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}) {
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const { sourceImage, newSize, imageBytes, inputExt, outputExt } = options
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const { width, height } = newSize
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if (hasExif(sourceImage)) return false
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if (sourceImage.getWidth() > width || sourceImage.getHeight() > height) return false
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if (inputExt !== outputExt) return false
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const kB = 1000
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if (height >= 1000) return imageBytes <= 200 * kB
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if (height >= 500) return imageBytes <= 100 * kB
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return imageBytes <= 15 * kB
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}
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function hasExif (image: Jimp) {
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return !!(image.bitmap as any).exifBuffer
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}
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function removeExif (image: Jimp) {
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(image.bitmap as any).exifBuffer = null
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}
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