konva/lib/filters/RGB.js

HTML5 2d canvas library.

import { Factory } from "../Factory.js";
import { Node } from "../Node.js";
import { RGBComponent } from "../Validators.js";
export const RGB = function (imageData) {
    const data = imageData.data, nPixels = data.length, red = this.red(), green = this.green(), blue = this.blue();
    for (let i = 0; i < nPixels; i += 4) {
        const brightness = (0.34 * data[i] + 0.5 * data[i + 1] + 0.16 * data[i + 2]) / 255;
        data[i] = brightness * red;
        data[i + 1] = brightness * green;
        data[i + 2] = brightness * blue;
        data[i + 3] = data[i + 3];
    }
};
Factory.addGetterSetter(Node, 'red', 0, function (val) {
    this._filterUpToDate = false;
    if (val > 255) {
        return 255;
    }
    else if (val < 0) {
        return 0;
    }
    else {
        return Math.round(val);
    }
});
Factory.addGetterSetter(Node, 'green', 0, function (val) {
    this._filterUpToDate = false;
    if (val > 255) {
        return 255;
    }
    else if (val < 0) {
        return 0;
    }
    else {
        return Math.round(val);
    }
});
Factory.addGetterSetter(Node, 'blue', 0, RGBComponent, Factory.afterSetFilter);