1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
import * as sharp from 'sharp';
export type IImage = {
data: Buffer;
ext: string | null;
type: string;
};
/**
* Convert to JPEG
* with resize, remove metadata, resolve orientation, stop animation
*/
export async function convertToJpeg(path: string, width: number, height: number): Promise<IImage> {
return convertSharpToJpeg(await sharp(path), width, height);
}
export async function convertSharpToJpeg(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
const data = await sharp
.resize(width, height, {
fit: 'inside',
withoutEnlargement: true
})
.rotate()
.jpeg({
quality: 85,
progressive: true
})
.toBuffer();
return {
data,
ext: 'jpg',
type: 'image/jpeg'
};
}
/**
* Convert to WebP
* with resize, remove metadata, resolve orientation, stop animation
*/
export async function convertToWebp(path: string, width: number, height: number): Promise<IImage> {
return convertSharpToWebp(await sharp(path), width, height);
}
export async function convertSharpToWebp(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
const data = await sharp
.resize(width, height, {
fit: 'inside',
withoutEnlargement: true
})
.rotate()
.webp({
quality: 85
})
.toBuffer();
return {
data,
ext: 'webp',
type: 'image/webp'
};
}
/**
* Convert to PNG
* with resize, remove metadata, resolve orientation, stop animation
*/
export async function convertToPng(path: string, width: number, height: number): Promise<IImage> {
return convertSharpToPng(await sharp(path), width, height);
}
export async function convertSharpToPng(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
const data = await sharp
.resize(width, height, {
fit: 'inside',
withoutEnlargement: true
})
.rotate()
.png()
.toBuffer();
return {
data,
ext: 'png',
type: 'image/png'
};
}
/**
* Convert to PNG or JPEG
* with resize, remove metadata, resolve orientation, stop animation
*/
export async function convertToPngOrJpeg(path: string, width: number, height: number): Promise<IImage> {
return convertSharpToPngOrJpeg(await sharp(path), width, height);
}
export async function convertSharpToPngOrJpeg(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
const stats = await sharp.stats();
const metadata = await sharp.metadata();
// 不透明で300x300pxの範囲を超えていればJPEG
if (stats.isOpaque && ((metadata.width && metadata.width >= 300) || (metadata.height && metadata!.height >= 300))) {
return await convertSharpToJpeg(sharp, width, height);
} else {
return await convertSharpToPng(sharp, width, height);
}
}
|
