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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _utils = require("@jimp/utils");
/**
* Get an image's histogram
* @return {object} An object with an array of color occurrence counts for each channel (r,g,b)
*/
function histogram() {
const histogram = {
r: new Array(256).fill(0),
g: new Array(256).fill(0),
b: new Array(256).fill(0)
};
this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function (x, y, index) {
histogram.r[this.bitmap.data[index + 0]]++;
histogram.g[this.bitmap.data[index + 1]]++;
histogram.b[this.bitmap.data[index + 2]]++;
});
return histogram;
}
/**
* Normalize values
* @param {integer} value Pixel channel value.
* @param {integer} min Minimum value for channel
* @param {integer} max Maximum value for channel
* @return {integer} normalized values
*/
const normalize = function (value, min, max) {
return (value - min) * 255 / (max - min);
};
const getBounds = function (histogramChannel) {
return [histogramChannel.findIndex(value => value > 0), 255 - histogramChannel.slice().reverse().findIndex(value => value > 0)];
};
/**
* Normalizes the image
* @param {function(Error, Jimp)} cb (optional) a callback for when complete
* @returns {Jimp} this for chaining of methods
*/
var _default = () => ({
normalize(cb) {
const h = histogram.call(this);
// store bounds (minimum and maximum values)
const bounds = {
r: getBounds(h.r),
g: getBounds(h.g),
b: getBounds(h.b)
};
// apply value transformations
this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function (x, y, idx) {
const r = this.bitmap.data[idx + 0];
const g = this.bitmap.data[idx + 1];
const b = this.bitmap.data[idx + 2];
this.bitmap.data[idx + 0] = normalize(r, bounds.r[0], bounds.r[1]);
this.bitmap.data[idx + 1] = normalize(g, bounds.g[0], bounds.g[1]);
this.bitmap.data[idx + 2] = normalize(b, bounds.b[0], bounds.b[1]);
});
if ((0, _utils.isNodePattern)(cb)) {
cb.call(this, null, this);
}
return this;
}
});
exports.default = _default;
module.exports = exports.default;
module.exports.default = exports.default;
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