OSD时间戳不显示

首先用线程定时调用SDL+ttf生成时间戳的bmp文件（这部分没有问题）

然后将bmp加载到OSD VPSS，图像画面不显示OSD，log如下：


PS.bmp文件加载到OSD关键代码如下：
[code]{

   

    HI_S32 s32Ret = HI_SUCCESS;

    BITMAP_S stBitmap;

    SDL_PixelFormat *fmt;

    SDL_Color forecol = { 0xff, 0xff, 0xff, 0xff };



    s_stSdlTtf.pstText = TTF_RenderUTF8_Solid(s_stSdlTtf.pFont, pstContent->szStr, forecol);

     

    fmt = (SDL_PixelFormat *)malloc(sizeof(SDL_PixelFormat));

    memset(fmt, 0, sizeof(SDL_PixelFormat));



    fmt->BitsPerPixel = BITS_PER_PIXEL;

    fmt->BytesPerPixel = 2;

    fmt->colorkey = 0xffffffff;

    fmt->alpha = 0xff;



    s_stSdlTtf.pstSurface = SDL_ConvertSurface(s_stSdlTtf.pstText, fmt, 0);



    // s32Ret = SDL_SaveBMP(s_stSdlTtf.pstSurface, BMP_NAME);

    // if ( 0 != s32Ret )

    // {

    //     MLOGE("SDL save string bmp failed. \n");

    // }   



    stBitmap.enPixelFormat = PIXEL_FORMAT_ARGB_1555 ;

    stBitmap.u32Width = s_stSdlTtf.pstSurface->w;

    stBitmap.u32Height = s_stSdlTtf.pstSurface->h;

   

    stBitmap.pData = malloc(2 * stBitmap.u32Width * stBitmap.u32Height);

    if ( stBitmap.pData == NULL )

    {

        MLOGE("dynamic memory allocation failed\n");

    }

    stBitmap.pData = s_stSdlTtf.pstSurface->pixels;



    s32Ret = HI_MPI_RGN_SetBitMap(RgnHdl, &stBitmap);

    if(HI_SUCCESS != s32Ret)

    {

        MLOGE("HI_MPI_RGN_SetBitMap failed,RgnHdl[%d] Error Code: [0x%08X]\n", RgnHdl, s32Ret);

        return s32Ret;

    }

    if (NULL != stBitmap.pData)

    {

        free(stBitmap.pData);

        stBitmap.pData = NULL;

    }



    return s32Ret;

}[/code]