java:图像矩阵90,270度原地旋转的java实现

	/**
	 * 图像顺时针旋转90度
	 * @param input
	 * @param width
	 * @param height
	 * @param bpp
	 */
	public static void rotate90(byte[] input,int width,int height,int bpp) {
		if (input.length != width * height * bpp) {
			throw new IllegalArgumentException("INVALID INPUT SIZE");
		}
		byte[] tmp = new byte[bpp];
		for (int i = 0; i < width; i++) 
		{
			for (int j = 0; j < height; j++) 
			{
				int I = height - 1 - j;
				int J = i;
				while ((i*height + j) > (I*width + J))
				{
					int p = I*width + J;
					int tmp_i = p / height;
					int tmp_j = p % height;
					I = height - 1 - tmp_j;
					J = tmp_i;
				} 
				swap(input,(i*height + j)*bpp, (I*width + J)*bpp, bpp, tmp);
			}
		}
	}
	/**
	 * 图像顺时针旋转270度
	 * @param input
	 * @param width
	 * @param height
	 * @param bpp
	 */
	public static void rotate270(byte[] input,int width,int height,int bpp) {
		if (input.length != width * height * bpp) {
			throw new IllegalArgumentException("INVALID INPUT SIZE");
		}
		byte[] tmp = new byte[bpp];
		for (int i = 0; i < width; i++) 
		{
			for (int j = 0; j < height; j++) 
			{
				int I = j;
				int J = width - 1 - i;
				while ((i*height + j) > (I*width + J))
				{
					int p = I*width + J;
					int tmp_i = p / height;
					int tmp_j = p % height;
					I = tmp_j;
					J = width - 1 - tmp_i;
				} 
				swap(input,(i*height + j)*bpp, (I*width + J)*bpp, bpp, tmp);
			}
		}
		
	}
	/**
	 * 对数据array中x和y指向的数据交换
	 * @param array 
	 * @param x 
	 * @param y
	 * @param size 数据交换长度
	 * @param tmp 用于数据交换的临时缓冲区，长度必须>= size
	 */
	private static void swap(byte[] array,int x,int y, int size, byte[] tmp){
		System.arraycopy(array, x, tmp, 0, size);
		System.arraycopy(array, y, array, x, size);
		System.arraycopy(tmp, 0, array, y, size);
	}