index.js
2.01 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
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = void 0;
var _utils = require("@jimp/utils");
/**
* Masks a source image on to this image using average pixel colour. A completely black pixel on the mask will turn a pixel in the image completely transparent.
* @param {Jimp} src the source Jimp instance
* @param {number} x the horizontal position to blit the image
* @param {number} y the vertical position to blit the image
* @param {function(Error, Jimp)} cb (optional) a callback for when complete
* @returns {Jimp} this for chaining of methods
*/
var _default = function _default() {
return {
mask: function mask(src) {
var x = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
var y = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;
var cb = arguments.length > 3 ? arguments[3] : undefined;
if (!(src instanceof this.constructor)) {
return _utils.throwError.call(this, 'The source must be a Jimp image', cb);
}
if (typeof x !== 'number' || typeof y !== 'number') {
return _utils.throwError.call(this, 'x and y must be numbers', cb);
} // round input
x = Math.round(x);
y = Math.round(y);
var w = this.bitmap.width;
var h = this.bitmap.height;
var baseImage = this;
src.scanQuiet(0, 0, src.bitmap.width, src.bitmap.height, function (sx, sy, idx) {
var destX = x + sx;
var destY = y + sy;
if (destX >= 0 && destY >= 0 && destX < w && destY < h) {
var dstIdx = baseImage.getPixelIndex(destX, destY);
var data = this.bitmap.data;
var avg = (data[idx + 0] + data[idx + 1] + data[idx + 2]) / 3;
baseImage.bitmap.data[dstIdx + 3] *= avg / 255;
}
});
if ((0, _utils.isNodePattern)(cb)) {
cb.call(this, null, this);
}
return this;
}
};
};
exports["default"] = _default;
module.exports = exports.default;
//# sourceMappingURL=index.js.map