Still get SDL window with SetVideoMode(0,0,0,SDL_SWSURFACE)

SDL Development
1

I have a wxWidgets application that uses SDL for image processing, but not
for output.

So in order not to have an SDL window, I would call
SDL_SetVideoMode(0,0,0,SDL_SWSURFACE). Or leave it out altogether, which
seemed to work too.

I could then create surfaces and overlays and have blit them to my wxWidgets
controls.

But now that I have upgraded to 1.2.12, I get an SDL window of the current
desktop size if I call SDL_SetVideoMode as in agreement with the changes
introduced with 1.2.10.

And if I leave it out, I get no window, but then SDL_DisplayYUVOverlay
fails, presumably because it clips the rectangle to the screen area, which
is absent.

If have verified this by removing the lines from SDL_yuc.c that check for
screen height and width. Without these lines I can use SDL without calling
SDL_SetVideoMode and have SDL_DisplayYUVOverlay work too.

I am sure there might be unwanted side effects, so I leave it up to you
experts to point me to a better solution.

Please advise.–
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2

Hi,On Mon, Oct 01, 2007 at 12:20:20AM -0700, manmach wrote:

I have a wxWidgets application that uses SDL for image processing, but not
for output.

So in order not to have an SDL window, I would call
SDL_SetVideoMode(0,0,0,SDL_SWSURFACE).

This now means “use the current resolution”.

I believe you can disable the window using:
putenv(“SDL_VIDEODRIVER=dummy”);

Can you try that?

–
Sylvain

3

Sylvain Beucler wrote:

Hi,

I have a wxWidgets application that uses SDL for image processing, but
not
for output.

So in order not to have an SDL window, I would call
SDL_SetVideoMode(0,0,0,SDL_SWSURFACE).

This now means “use the current resolution”.

I believe you can disable the window using:
putenv(“SDL_VIDEODRIVER=dummy”);

Can you try that?

I can, I did and it works. At least on my Windows machine. I’ll be trying on
my Linux machine next.

Thanks a bundle.

I realise mine might be an unusual usage of SDL, but maybe especially
because of that, it might be worth adding a note to the FAQ for instance.

regards,
Erik> On Mon, Oct 01, 2007 at 12:20:20AM -0700, manmach wrote:

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4

Hello !

I believe you can disable the window using:
putenv(“SDL_VIDEODRIVER=dummy”);

Can you try that?

If you never want to have a window in your app,
you can use SDL_putenv in your C code.

CU

5

Torsten Giebl wrote:

If you never want to have a window in your app,
you can use SDL_putenv in your C code.

Another great piece of advice! Of course, having learned about
SDL_VIDEODRIVER, I can now find threads on the same subject, making my
asking seem silly :-)–
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6

Torsten Giebl wrote:

If you never want to have a window in your app,
you can use SDL_putenv in your C code.

Another great piece of advice! Of course, having learned about
SDL_VIDEODRIVER, I can now find threads on the same subject, making my
asking seem silly :slight_smile:

By the way:

I could then create surfaces and overlays and have blit them to my
wxWidgets controls.

How did you blit the surface to wxWidgets? :slight_smile:

Thanks,On Mon, Oct 01, 2007 at 03:56:02AM -0700, manmach wrote:

–
Sylvain

7

Sylvain Beucler wrote:

By the way:

I could then create surfaces and overlays and have blit them to my
wxWidgets controls.

How did you blit the surface to wxWidgets? :slight_smile:

By creating a bitmap from the SDL_Surface and painting that using a buffered
paint DC. See code below.
mCanvas is a 24-bit RGB surface created with SDL_CreateRGBSurface. This
needs to be in OnPaint.

    // create a bitmap from our pixel data
    wxBitmap bmp(wxImage(mCanvas->w, mCanvas->h,
                         static_cast<unsigned char *>(mCanvas->pixels),

true));

    // paint it
    wxBufferedPaintDC dc(Panel, bmp);--

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