/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

/**
 * A very VM friendly rgba datastructure.
 * Please don't touch unless you take a look at the IR.
 */
export class RGBA8 {
  _rgba8Brand: void;

  static readonly Empty = new RGBA8(0, 0, 0, 0);

  /**
   * Red: integer in [0-255]
   */
  public readonly r: number;
  /**
   * Green: integer in [0-255]
   */
  public readonly g: number;
  /**
   * Blue: integer in [0-255]
   */
  public readonly b: number;
  /**
   * Alpha: integer in [0-255]
   */
  public readonly a: number;

  constructor(r: number, g: number, b: number, a: number) {
    this.r = RGBA8._clamp(r);
    this.g = RGBA8._clamp(g);
    this.b = RGBA8._clamp(b);
    this.a = RGBA8._clamp(a);
  }

  public equals(other: RGBA8): boolean {
    return (
      this.r === other.r &&
      this.g === other.g &&
      this.b === other.b &&
      this.a === other.a
    );
  }

  private static _clamp(c: number): number {
    if (c < 0) {
      return 0;
    }
    if (c > 255) {
      return 255;
    }
    return c | 0;
  }
}