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1 | import { copy, readFile, remove, rename } from 'fs-extra' | |
2 | import Jimp, { read } from 'jimp' | |
3 | import { getLowercaseExtension } from './core-utils' | |
4 | import { convertWebPToJPG, processGIF } from './ffmpeg-utils' | |
5 | import { logger } from './logger' | |
6 | import { buildUUID } from './uuid' | |
7 | ||
8 | function generateImageFilename (extension = '.jpg') { | |
9 | return buildUUID() + extension | |
10 | } | |
11 | ||
12 | async function processImage ( | |
13 | path: string, | |
14 | destination: string, | |
15 | newSize: { width: number, height: number }, | |
16 | keepOriginal = false | |
17 | ) { | |
18 | const extension = getLowercaseExtension(path) | |
19 | ||
20 | if (path === destination) { | |
21 | throw new Error('Jimp/FFmpeg needs an input path different that the output path.') | |
22 | } | |
23 | ||
24 | logger.debug('Processing image %s to %s.', path, destination) | |
25 | ||
26 | // Use FFmpeg to process GIF | |
27 | if (extension === '.gif') { | |
28 | await processGIF(path, destination, newSize) | |
29 | } else { | |
30 | await jimpProcessor(path, destination, newSize, extension) | |
31 | } | |
32 | ||
33 | if (keepOriginal !== true) await remove(path) | |
34 | } | |
35 | ||
36 | // --------------------------------------------------------------------------- | |
37 | ||
38 | export { | |
39 | generateImageFilename, | |
40 | processImage | |
41 | } | |
42 | ||
43 | // --------------------------------------------------------------------------- | |
44 | ||
45 | async function jimpProcessor (path: string, destination: string, newSize: { width: number, height: number }, inputExt: string) { | |
46 | let sourceImage: Jimp | |
47 | const inputBuffer = await readFile(path) | |
48 | ||
49 | try { | |
50 | sourceImage = await read(inputBuffer) | |
51 | } catch (err) { | |
52 | logger.debug('Cannot read %s with jimp. Try to convert the image using ffmpeg first.', path, { err }) | |
53 | ||
54 | const newName = path + '.jpg' | |
55 | await convertWebPToJPG(path, newName) | |
56 | await rename(newName, path) | |
57 | ||
58 | sourceImage = await read(path) | |
59 | } | |
60 | ||
61 | await remove(destination) | |
62 | ||
63 | // Optimization if the source file has the appropriate size | |
64 | const outputExt = getLowercaseExtension(destination) | |
65 | if (skipProcessing({ sourceImage, newSize, imageBytes: inputBuffer.byteLength, inputExt, outputExt })) { | |
66 | return copy(path, destination) | |
67 | } | |
68 | ||
69 | await autoResize({ sourceImage, newSize, destination }) | |
70 | } | |
71 | ||
72 | async function autoResize (options: { | |
73 | sourceImage: Jimp | |
74 | newSize: { width: number, height: number } | |
75 | destination: string | |
76 | }) { | |
77 | const { sourceImage, newSize, destination } = options | |
78 | ||
79 | // Portrait mode targetting a landscape, apply some effect on the image | |
80 | const sourceIsPortrait = sourceImage.getWidth() < sourceImage.getHeight() | |
81 | const destIsPortraitOrSquare = newSize.width <= newSize.height | |
82 | ||
83 | if (sourceIsPortrait && !destIsPortraitOrSquare) { | |
84 | const baseImage = sourceImage.cloneQuiet().cover(newSize.width, newSize.height) | |
85 | .color([ { apply: 'shade', params: [ 50 ] } ]) | |
86 | ||
87 | const topImage = sourceImage.cloneQuiet().contain(newSize.width, newSize.height) | |
88 | ||
89 | return write(baseImage.blit(topImage, 0, 0), destination) | |
90 | } | |
91 | ||
92 | return write(sourceImage.cover(newSize.width, newSize.height), destination) | |
93 | } | |
94 | ||
95 | function write (image: Jimp, destination: string) { | |
96 | return image.quality(80).writeAsync(destination) | |
97 | } | |
98 | ||
99 | function skipProcessing (options: { | |
100 | sourceImage: Jimp | |
101 | newSize: { width: number, height: number } | |
102 | imageBytes: number | |
103 | inputExt: string | |
104 | outputExt: string | |
105 | }) { | |
106 | const { sourceImage, newSize, imageBytes, inputExt, outputExt } = options | |
107 | const { width, height } = newSize | |
108 | ||
109 | if (sourceImage.getWidth() > width || sourceImage.getHeight() > height) return false | |
110 | if (inputExt !== outputExt) return false | |
111 | ||
112 | const kB = 1000 | |
113 | ||
114 | if (height >= 1000) return imageBytes <= 200 * kB | |
115 | if (height >= 500) return imageBytes <= 100 * kB | |
116 | ||
117 | return imageBytes <= 15 * kB | |
118 | } |