kollagen/cli/collages.ts

import { CollageModes } from "../src/common/collages.ts";
import {
  CanvasRenderingContext2D,
  Image,
} from "https://deno.land/x/canvas/mod.ts";
import { CollageContext, CollageImage } from "../src/common/types.ts";

export class ProxyImage implements CollageImage {
  private image: Image;
  public readonly height: number;
  public readonly width: number;

  constructor(image: Image) {
    this.image = image;
    this.width = image.width();
    this.height = image.height();
  }

  public get(): Image {
    return this.image;
  }
}

export type CastCanvasRenderingContext =
  & CanvasRenderingContext2D
  & CollageContext;

export default class BrowserCollageModes
  extends CollageModes<CastCanvasRenderingContext, ProxyImage> {
  drawImage(
    ctx: CastCanvasRenderingContext,
    image: ProxyImage,
    sx: number,
    sy: number,
    sw: number,
    sh: number,
    dx: number,
    dy: number,
    dw: number,
    dh: number,
  ): void {
    ctx.drawImage(image.get(), sx, sy, sw, sh, dx, dy, dw, dh);
  }
}