imagerot/lib/modes/chimera/index.js

A lightweight, cross-environment image library for applying unique effects via raw image buffers.

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.chimera = void 0;
const math_1 = require("../../constants/math");
const helpers_1 = require("../../helpers");
const weight = [0.25, 0.5];
const chimera = (_a) => __awaiter(void 0, [_a], void 0, function* ({ data, width, height, effects }) {
    const algorithm = (_a) => __awaiter(void 0, [_a], void 0, function* ({ data, width, height }) {
        for (let y = 0; y < height; y++) {
            for (let x = 0; x < width; x++) {
                let index = (y * width + x) * 4;
                let r = data[index], g = data[index + 1], b = data[index + 2];
                data[index + 0] = (r + g * weight[1] + b * weight[0]);
                data[index + 1] = (r * weight[1] + g + b * weight[0]);
                data[index + 2] = (r * weight[0] + g * weight[1] + b);
            }
        }
        return data;
    });
    const direction = (0, math_1.random)() >= 0.5 ? 'horizontal' : 'vertical';
    const intensity = (0, helpers_1.randomize)(5, 10);
    data = (yield effects.blur.method({ data, width, height }, { direction, intensity })) || data;
    data = yield algorithm({ data, width, height });
    for (let index = 0; index < data.length; index += 4) {
        const useNoise = (0, math_1.random)() < 0.2;
        const useGrain = (0, math_1.random)() < 0.4 ? (0, math_1.floor)((0, math_1.random)() * 50) : 0;
        for (let i = 0; i < 3; i++) {
            data[index + i] = useNoise ? (0, math_1.min)(data[index + i] + (0, helpers_1.randomize)(1, i === 0 ? 15 : 10), 255) : data[index + i];
            data[index + i] = (0, math_1.min)(255, (0, math_1.max)(0, data[index + i] + ((0, math_1.floor)((0, math_1.random)() * 20) - 30)));
            data[index + i] = useGrain ? (0, math_1.min)(255, (0, math_1.max)(0, data[index + i] + useGrain)) : data[index + i];
        }
        ;
    }
    data = (yield effects.rectangles.method({ data, width, height }, { offset: 10, intensity: 15, sizeModifier: 1.25 })) || data;
    return data;
});
exports.chimera = chimera;