konva/lib/filters/RGBA.js

HTML5 2d canvas library.

import { Factory } from "../Factory.js";
import { Node } from "../Node.js";
import { RGBComponent } from "../Validators.js";
export const RGBA = function (imageData) {
    const data = imageData.data, nPixels = data.length, red = this.red(), green = this.green(), blue = this.blue(), alpha = this.alpha();
    for (let i = 0; i < nPixels; i += 4) {
        const ia = 1 - alpha;
        data[i] = red * alpha + data[i] * ia;
        data[i + 1] = green * alpha + data[i + 1] * ia;
        data[i + 2] = blue * alpha + data[i + 2] * ia;
    }
};
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);
Factory.addGetterSetter(Node, 'alpha', 1, function (val) {
    this._filterUpToDate = false;
    if (val > 1) {
        return 1;
    }
    else if (val < 0) {
        return 0;
    }
    else {
        return val;
    }
});