Unity 图片的旋转

        /// <summary>
        /// 图片逆时针旋转90度
        /// </summary>
        /// <param name="src">原图片二进制数据</param>
        /// <param name="srcW">原图片宽度</param>
        /// <param name="srcH">原图片高度</param>
        /// <param name="desTexture">输出目标图片</param>
        public static void RotationLeft90(Color32[] src, int srcW, int srcH, Texture2D desTexture)
        {
            if (pixelsLen != src.Length || des == null)
            {
                pixelsLen = src.Length;
                des = new Color32[pixelsLen];
            }

            if (desTexture.width != srcH || desTexture.height != srcW)
            {
                desTexture.Resize(srcH, srcW);
            }

            for (int i = 0; i < srcW; i++)
            {
                for (int j = 0; j < srcH; j++)
                {
                    des[i * srcH + j] = src[(srcH - 1 - j) * srcW + i];
                }
            }

            desTexture.SetPixels32(des);
            desTexture.Apply();
        }


        /// <summary>
        /// 图片顺时针旋转90度
        /// </summary>
        /// <param name="src">原图片二进制数据</param>
        /// <param name="srcW">原图片宽度</param>
        /// <param name="srcH">原图片高度</param>
        /// <param name="desTexture">输出目标图片</param>
        public static void RotationRight90(Color32[] src, int srcW, int srcH, Texture2D desTexture)
        {
            if (pixelsLen != src.Length || des == null)
            {
                pixelsLen = src.Length;
                des = new Color32[pixelsLen];
            }

            if (desTexture.width != srcH || desTexture.height != srcW)
            {
                desTexture.Resize(srcH, srcW);
            }

            for (int i = 0; i < srcH; i++)
            {
                for (int j = 0; j < srcW; j++)
                {
                    des[(srcW - j - 1) * srcH + i] = src[i * srcW + j];
                }
            }

            desTexture.SetPixels32(des);
            desTexture.Apply();
        }

        /// <summary>
        /// 图片旋转180度
        /// </summary>
        /// <param name="src">原图片二进制数据</param>
        /// <param name="srcW">原图片宽度</param>
        /// <param name="srcH">原图片高度</param>
        /// <param name="desTexture">输出目标图片</param>
        public static void Rotation180(Color32[] src, int srcW, int srcH, Texture2D desTexture)
        {
            if (pixelsLen != src.Length || des == null)
            {
                pixelsLen = src.Length;
                des = new Color32[pixelsLen];
            }

            if (desTexture.width != srcW || desTexture.height != srcH)
            {
                desTexture.Resize(srcW, srcH);
            }

            for (int i = 0; i < srcH; i++)
            {
                for (int j = 0; j < srcW; j++)
                {
                    des[i * srcW + j] = src[(srcH - i) * srcW - j - 1];
                }
            }

            desTexture.SetPixels32(des);
            desTexture.Apply();
        }

        /// <summary>
        /// 图片镜像
        /// </summary>
        /// <param name="src">原图片二进制数据</param>
        /// <param name="srcW">原图片宽度</param>
        /// <param name="srcH">原图片高度</param>
        /// <param name="desTexture">输出目标图片</param>
        public static void Mirror(Color32[] src, int srcW, int srcH, Texture2D desTexture)
        {
            if (pixelsLen != src.Length || des == null)
            {
                pixelsLen = src.Length;
                des = new Color32[pixelsLen];
            }

            if (desTexture.width != srcW || desTexture.height != srcH)
            {
                desTexture.Resize(srcW, srcH);
            }

            for (int i = 0; i < srcH; i++)
            {
                for (int j = 0; j < srcW; j++)
                {
                    des[i * srcW + j] = src[(i + 1) * srcW - j - 1];
                }
            }

            desTexture.SetPixels32(des);
            desTexture.Apply();
        }

        /// <summary>
        /// 图片拷贝
        /// </summary>
        /// <param name="src">原图片二进制数据</param>
        /// <param name="srcW">原图片宽度</param>
        /// <param name="srcH">原图片高度</param>
        /// <param name="desTexture">输出目标图片</param>
        public static void Copy(Color32[] src, int srcW, int srcH, Texture2D desTexture)
        {
            if (desTexture.width != srcW || desTexture.height != srcH)
            {
                desTexture.Resize(srcW, srcH);
            }

            desTexture.SetPixels32(src);
            desTexture.Apply();
        }