jimp-image-processor.class.ts

import Jimp from "jimp";
import { Image } from "../../image.class";
import { Point } from "../../point.class";
import { ImageProcessor } from "../image-processor.interface";
import { imageToJimp } from "../io/imageToJimp.function";
import { RGBA } from "../../rgba.class";

export default class implements ImageProcessor {
  colorAt(
    image: Image | Promise<Image>,
    point: Point | Promise<Point>
  ): Promise<RGBA> {
    return new Promise<RGBA>(async (resolve, reject) => {
      const location = await point;
      const img = await image;
      if (location.x < 0 || location.x >= img.width) {
        reject(
          `Query location out of bounds. Should be in range 0 <= x < image.width, is ${location.x}`
        );
        return;
      }
      if (location.y < 0 || location.y >= img.height) {
        reject(
          `Query location out of bounds. Should be in range 0 <= y < image.height, is ${location.y}`
        );
        return;
      }
      const jimpImage = imageToJimp(img);
      const rgba = Jimp.intToRGBA(
        jimpImage.getPixelColor(location.x, location.y)
      );
      resolve(new RGBA(rgba.r, rgba.g, rgba.b, rgba.a));
    });
  }
}