[maemo-developers] [maemo-developers] Workaround to prevent crash when pressing home key in SDL programs (IT2006)?

[From: Tapani Pälli]

ext Frantisek Dufka wrote:
> Hi,
>
> tried it yesterday just for fun and it works.
>
> code looks like this:
>
> #include <SDL/SDL.h>
> #include "SDL_x11video.h"
> #undef WMwindow
>
> extern SDL_VideoDevice *current_video;
>
> void SDL_X11_SetNetWMWindowType(char *windowtypestring){
>     if (current_video && current_video->name &&
> (strcmp(current_video->name,"x11
> ")==0)){
>         struct SDL_PrivateVideoData *x11data=(struct
> SDL_PrivateVideoData *)current_video->hidden;
>         Atom atoms[1] = { None };
>         Atom net_wm_window_type;
>
>         net_wm_window_type = XInternAtom (x11data->X11_Display,
>                                           "_NET_WM_WINDOW_TYPE", False);
>
>         atoms[0] = XInternAtom (x11data->X11_Display,
>                                 windowtypestring,
>                                 False);
>
>         XChangeProperty ( x11data->X11_Display,
>                           x11data->WMwindow,
>                          net_wm_window_type,
>                          XA_ATOM, 32, PropModeReplace,
>                          (unsigned char *)atoms, 1);
>
>     }
>
> }
>
> and example
>
> int main(int argc, char *argv[]){
>   SDL_Event event;
>     int done=0;
>     SDL_Init(SDL_INIT_VIDEO);
>     SDL_SetVideoMode(720, 480, 0, 0);
>     SDL_WM_SetCaption(argv[0], NULL);
>     SDL_X11_SetNetWMWindowType("_NET_WM_WINDOW_TYPE_NORMAL");
>     while (!done){
>     SDL_PollEvent(&event);
>     if(event.key.keysym.sym == SDLK_ESCAPE)
>         done = 1;
>     SDL_Delay(1);
>     }
>     SDL_Quit();
>     return(0);
> }
>
>
> but you need to have sdl sources (fakeroot apt-get source libsdl1.2)
> to get SDL_x11video.h and SDL_sysvideo.h headers and compile it like this
>

You can access display and window from SDL code without SDL sources ...
you have to include <SDL/SDL_syswm.h> and then in code :

SDL_SysWMinfo wminfo;
SDL_VERSION(&wminfo.version);
SDL_GetWMInfo(&wminfo);

then just use wminfo in calls to X like :

XChangeWindowAttributes(wminfo.info.x11.display,
                          wminfo.info.x11.fswindow .......


> gcc -Os sdltest.c -I /usr/include/SDL -I /usr/X11R6/include -o sdltest
> -lSDL
>
>
> Frantisek
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>

// Tapani