+ // 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 targeting a landscape, apply some effect on the image
+ const sourceIsPortrait = sourceImage.getWidth() < sourceImage.getHeight()
+ const destIsPortraitOrSquare = newSize.width <= newSize.height
+
+ removeExif(sourceImage)
+
+ if (sourceIsPortrait && !destIsPortraitOrSquare) {
+ 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.cover(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 (hasExif(sourceImage)) return false
+ 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
+}
+
+function hasExif (image: Jimp) {
+ return !!(image.bitmap as any).exifBuffer
+}
+
+function removeExif (image: Jimp) {
+ (image.bitmap as any).exifBuffer = null