[directfb-users] error(Invalid argument!) about for create surface with preallocated "video only" memory

[jojo]

Hi, 
I want to use directfb to Blit/StretchBlit with my preallocated "video only" 
memory,

It return error from "CreateSurface", my steps and environment is following:

DFB version : 1.4.0

DFBSurfaceDescription dsc = {0};
    dsc.flags = DSDESC_WIDTH | DSDESC_HEIGHT | DSDESC_PIXELFORMAT | 
DSDESC_PREALLOCATED | DSDESC_CAPS;
    dsc.pixelformat = DSPF_RGB32;
    dsc.caps = DSCAPS_VIDEOONLY;

    dsc.width = src_width;
    dsc.height = src_height;
    dsc.preallocated[0].data = src_data;
    dsc.preallocated[0].pitch = src_stride;

    ret = dfb->CreateSurface(dfb, &dsc, &src );
    if (ret != DFB_OK) {
        printf("****** jojo ****** CreateSurface(src) error(%s)\n", 
DirectResultString(ret));
        return;
    }


Anyone have ideas about for this ?

Thanks,

- Jojo


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