YUV420SP图像旋转算法

private static void yuv420spRotate90(byte[] des, byte[] src,
                                         int width, int height) {
        int wh = width * height;
        int k = 0;
        for(int i = 0; i < width; i++) {
            for(int j = height - 1; j >= 0; j--)
            {
                des[k] = src[width * j + i];
                k++;
            }
        }
        for(int i = 0; i < width; i += 2) {
            for(int j = height / 2 - 1; j >= 0; j--)
            {
                des[k] = src[wh+ width * j + i];
                des[k+1] = src[wh + width * j + i + 1];
                k+=2;
            }
        }
    }

private static void YUV420spRotate180(byte[] des,byte[] src,int width,int height)
    {
        int n = 0;
        int uh = height >> 1;
        int wh = width * height;
        //copy y
        for(int j = height - 1; j >= 0; j--)
        {
            for(int i = width - 1; i >= 0; i--)
            {
                des[n++] = src[width * j + i];
            }
        }

        for(int j = uh - 1;j >= 0; j--)
        {
            for(int i = width - 1; i > 0; i -= 2)
            {
                des
 = src[wh + width * j + i - 1];
                des[n + 1] = src[wh + width * j + i];
                n += 2;
            }
        }
    }

private static void YUV420spRotate270(byte[] des,byte[] src,int width,int height)
    {
        int n = 0;
        int uvHeight = height >> 1;
        int wh = width * height;
        //copy y
        for(int j = width - 1; j >= 0; j--)
        {
            for(int i = 0; i < height;i++)
            {
                des[n++] = src[width * i + j];
            }
        }

        for(int j = width - 1; j > 0;j -= 2)
        {
            for(int i = 0; i < uvHeight; i++)
            {
                des[n++] = src[wh + width * i + j - 1];
                des[n++] = src[wh + width * i + j];
            }
        }
    }