118 lines
3.5 KiB
TypeScript
118 lines
3.5 KiB
TypeScript
import { copy, readFile, remove, rename } from 'fs-extra'
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import Jimp, { read } from 'jimp'
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import { getLowercaseExtension } from '@shared/core-utils'
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import { buildUUID } from '@shared/extra-utils'
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import { convertWebPToJPG, processGIF } from './ffmpeg-utils'
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import { logger } from './logger'
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function generateImageFilename (extension = '.jpg') {
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return buildUUID() + extension
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}
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async function processImage (
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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 = false
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) {
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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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}
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// ---------------------------------------------------------------------------
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export {
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generateImageFilename,
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processImage
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}
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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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try {
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sourceImage = await 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, newName)
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await rename(newName, path)
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sourceImage = await 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 targetting 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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if (sourceIsPortrait && !destIsPortraitOrSquare) {
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const baseImage = sourceImage.cloneQuiet().cover(newSize.width, newSize.height)
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.color([ { apply: '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 (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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