index.js
1.86 KB
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
import { isNodePattern, throwError } from '@jimp/utils';
export default () => ({
/**
* Uniformly scales the image by a factor.
* @param {number} f the factor to scale the image by
* @param {string} mode (optional) a scaling method (e.g. Jimp.RESIZE_BEZIER)
* @param {function(Error, Jimp)} cb (optional) a callback for when complete
* @returns {Jimp} this for chaining of methods
*/
scale(f, mode, cb) {
if (typeof f !== 'number') {
return throwError.call(this, 'f must be a number', cb);
}
if (f < 0) {
return throwError.call(this, 'f must be a positive number', cb);
}
if (typeof mode === 'function' && typeof cb === 'undefined') {
cb = mode;
mode = null;
}
const w = this.bitmap.width * f;
const h = this.bitmap.height * f;
this.resize(w, h, mode);
if (isNodePattern(cb)) {
cb.call(this, null, this);
}
return this;
},
/**
* Scale the image to the largest size that fits inside the rectangle that has the given width and height.
* @param {number} w the width to resize the image to
* @param {number} h the height to resize the image to
* @param {string} mode (optional) a scaling method (e.g. Jimp.RESIZE_BEZIER)
* @param {function(Error, Jimp)} cb (optional) a callback for when complete
* @returns {Jimp} this for chaining of methods
*/
scaleToFit(w, h, mode, cb) {
if (typeof w !== 'number' || typeof h !== 'number') {
return throwError.call(this, 'w and h must be numbers', cb);
}
if (typeof mode === 'function' && typeof cb === 'undefined') {
cb = mode;
mode = null;
}
const f =
w / h > this.bitmap.width / this.bitmap.height
? h / this.bitmap.height
: w / this.bitmap.width;
this.scale(f, mode);
if (isNodePattern(cb)) {
cb.call(this, null, this);
}
return this;
}
});