/*
 * libmedia write matrix
 *
 * 版权所有 (C) 2024 赵高兴
 * Copyright (C) 2024 Gaoxing Zhao
 *
 * 此文件是 libmedia 的一部分
 * This file is part of libmedia.
 * 
 * libmedia 是自由软件；您可以根据 GNU Lesser General Public License（GNU LGPL）3.1
 * 或任何其更新的版本条款重新分发或修改它
 * libmedia is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.1 of the License, or (at your option) any later version.
 * 
 * libmedia 希望能够为您提供帮助，但不提供任何明示或暗示的担保，包括但不限于适销性或特定用途的保证
 * 您应自行承担使用 libmedia 的风险，并且需要遵守 GNU Lesser General Public License 中的条款和条件。
 * libmedia is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 */

import type { IOWriterSync } from '@libmedia/common/io'

/**
 * transformation matrix
 *  |a  b  u|
 *  |c  d  v|
 *  |tx ty w|
 */
export default function writeMatrix(
  ioWriter: IOWriterSync,
  a: number,
  b: number,
  c: number,
  d: number,
  tx: number,
  ty: number
) {
  ioWriter.writeInt32(Math.floor(a * 65536))
  ioWriter.writeInt32(Math.floor(b * 65536))
  ioWriter.writeInt32(0)
  ioWriter.writeInt32(Math.floor(c * 65536))
  ioWriter.writeInt32(Math.floor(d * 65536))
  ioWriter.writeInt32(0)
  ioWriter.writeInt32(Math.floor(tx * 65536))
  ioWriter.writeInt32(Math.floor(ty * 65536))
  ioWriter.writeInt32(1 << 30)
}