Method blend

src/image/p5.Image.js:1362–1371

* @param {Integer} sx * @param {Integer} sy * @param {Integer} sw * @param {Integer} sh * @param {Integer} dx * @param {Integer} dy * @param {Integer} dw * @param {Integer} dh * @param {(BLEND|DARKEST|LIGHTEST|DIFFERENCE|MULTIPLY|EXCLUSION|SCREEN|REPLACE|OVERLAY|HARD

(...args)

   * @param  {(BLEND|DARKEST|LIGHTEST|DIFFERENCE|MULTIPLY|EXCLUSION|SCREEN|REPLACE|OVERLAY|HARD_LIGHT|SOFT_LIGHT|DODGE|BURN|ADD|NORMAL)} blendMode
   */
  blend(...args) {
    const currBlend = this.drawingContext.globalCompositeOperation;
    const blendMode = args[args.length - 1];
    const copyArgs = Array.prototype.slice.call(args, 0, args.length - 1);

    this.drawingContext.globalCompositeOperation = blendMode;
    this.copy(...copyArgs);
    this.drawingContext.globalCompositeOperation = currBlend;
    this.setModified(true);
  }

  /**
   * helper method for web GL mode to indicate that an image has been