Here is a code snippet from the cairo-directfb port
if( data ) {
dsc.flags |= DSDESC_CAPS;
dsc.flags |= DSDESC_PREALLOCATED;
dsc.caps = DSCAPS_NONE;
dsc.preallocated[0].data = data;
dsc.preallocated[0].pitch = pitch;
dsc.preallocated[1].data = NULL;
dsc.preallocated[1].pitch = 0;
}
In works.
On 1/9/06, Gerhard Ramsebner <[EMAIL PROTECTED]> wrote:
> I'm trying to write a scientific simulation. Therefore I need to render
> a junk of memory to screen. This data is a kind of image.
> I have already done this with QT so I have an idea how it is done.
> But now I've come into troubles creatig the surface using preallocated data.
> Could someone give me a hint?
> Is it possible to first create the surface and then access it's data?
> thanks a lot
>
> -----
>
> code scribble:
>
> struct{ /* parameter, data, ... */ } junk;
> // we use primary pixelformat for now
> primary->GetPixelFormat( primary, &junk.pixelformat );
> // allocate some memory for surface data
> // some code creates image data here
> junk.data = calloc( junk.size, (junk.pixelformat >> 17) & 0x07 );
> // create a surface description
> dsc.flags = DSDESCR_CAPS | DSDESC_WIDTH | DSDESCR_HEIGHT |\
> DSDESC_PIXELFORMAT | DSDESC_PREALLOCATED;
> dsc.caps = DSCAPS_NONE; /* ????????? */
> dsc.width = junk.width;
> dsc.height = junk.height;
> dsc.pixelformat = junk.pixelformat;
> dsc.preallocated[0].data = junk.data;
> dsc.preallocated[0].pitch = ; /* ????????? */
> //
> dfb->CreateSurface( dfb, &dsc, &junk.surface ); /* this is LINE 56 */
>
> -----
>
> build:
> gcc -Wall -I/usr/include/directfb -ldirectfb -02 -o simula simula.c
>
> -----
>
> whatever I try the engine keeps complaining:
> ---------------------- DirectFB v0.9.24 ---------------------
> (c) 2000-2002 convergence integrated media GmbH
> (c) 2002-2004 convergence GmbH
> -----------------------------------------------------------
>
> (*) DirectFB/Core: Single Application Core. (2006-01-01 00:12)
> (*) Direct/Memcpy: Using MMXEXT optimized memcpy()
> (*) Direct/Thread: Running 'VT Switcher' (CRITICAL, 4326)...
> (*) Direct/Thread: Running 'Keyboard Input' (INPUT, 4327)...
> (!!!) *** UNIMPLEMENTED [fusion_reactor_set_lock] *** [reactor.c:797]
> (*) DirectFB/Input: Keyboard 0.9 (convergence integrated media GmbH)
> (*) DirectFB/Genefx: MMX detected and enabled
> (*) DirectFB/Graphics: Matrox G550 0.7 (directfb.org)
> (*) DirectFB/Core/WM: Default 0.2 (Convergence GmbH)
> main.c <56>:
> (#) DirectFBError [dfb->CreateSurface( dfb, &dsc, &junk.surface )]:
> Invalid argument!
> (!!!) *** WARNING [Application exited without deinitialization of
> DirectFB!] *** [core.c:630 in dfb_core_deinit_check()]
>
>
> _______________________________________________
> directfb-dev mailing list
> [email protected]
> http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev
>
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