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import { copy, readFile, remove, rename } from 'fs-extra'
import Jimp, { read } from 'jimp'
import { getLowercaseExtension } from './core-utils'
import { convertWebPToJPG, processGIF } from './ffmpeg-utils'
import { logger } from './logger'
import { buildUUID } from './uuid'
function generateImageFilename (extension = '.jpg') {
return buildUUID() + extension
}
async function processImage (
path: string,
destination: string,
newSize: { width: number, height: number },
keepOriginal = false
) {
const extension = getLowercaseExtension(path)
if (path === destination) {
throw new Error('Jimp/FFmpeg needs an input path different that the output path.')
}
logger.debug('Processing image %s to %s.', path, destination)
// Use FFmpeg to process GIF
if (extension === '.gif') {
await processGIF(path, destination, newSize)
} else {
await jimpProcessor(path, destination, newSize, extension)
}
if (keepOriginal !== true) await remove(path)
}
// ---------------------------------------------------------------------------
export {
generateImageFilename,
processImage
}
// ---------------------------------------------------------------------------
async function jimpProcessor (path: string, destination: string, newSize: { width: number, height: number }, inputExt: string) {
let sourceImage: Jimp
const inputBuffer = await readFile(path)
try {
sourceImage = await read(inputBuffer)
} catch (err) {
logger.debug('Cannot read %s with jimp. Try to convert the image using ffmpeg first.', path, { err })
const newName = path + '.jpg'
await convertWebPToJPG(path, newName)
await rename(newName, path)
sourceImage = await read(path)
}
await remove(destination)
// Optimization if the source file has the appropriate size
const outputExt = getLowercaseExtension(destination)
if (skipProcessing({ sourceImage, newSize, imageBytes: inputBuffer.byteLength, inputExt, outputExt })) {
return copy(path, destination)
}
await autoResize({ sourceImage, newSize, destination })
}
async function autoResize (options: {
sourceImage: Jimp
newSize: { width: number, height: number }
destination: string
}) {
const { sourceImage, newSize, destination } = options
// Portrait mode, special handling
if (sourceImage.getWidth() < sourceImage.getHeight()) {
const baseImage = sourceImage.cloneQuiet().cover(newSize.width, newSize.height)
.color([ { apply: 'shade', params: [ 50 ] } ])
const topImage = sourceImage.cloneQuiet().contain(newSize.width, newSize.height)
return write(baseImage.blit(topImage, 0, 0), destination)
}
return write(sourceImage.contain(newSize.width, newSize.height), destination)
}
function write (image: Jimp, destination: string) {
return image.quality(80).writeAsync(destination)
}
function skipProcessing (options: {
sourceImage: Jimp
newSize: { width: number, height: number }
imageBytes: number
inputExt: string
outputExt: string
}) {
const { sourceImage, newSize, imageBytes, inputExt, outputExt } = options
const { width, height } = newSize
if (sourceImage.getWidth() > width || sourceImage.getHeight() > height) return false
if (inputExt !== outputExt) return false
const kB = 1000
if (height >= 1000) return imageBytes <= 200 * kB
if (height >= 500) return imageBytes <= 100 * kB
return imageBytes <= 15 * kB
}
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