How to know the surface is the screen or not?

SDL Development
1

I’m writing a fbcon hardware accel driver.
I’d like to do something in FillHWRect like this:

HWAccelBlit
{
if ( (dest_surface is screen) &&(screen is NOT doube buffered))
{
wait vsync
}
blit here
}

Does any one know how to do this?
thanks!–
Best wishes,
Jiangshan

2

http://www.libsdl.org/cgi/docwiki.cgi/SDL_GetVideoSurface
:slight_smile:
Compare that pointer to the dest surface pointer

-OzOn Sun, Jul 17, 2011 at 10:13 PM, ??? wrote:

I’m writing a fbcon hardware accel driver.
I’d like to do something in FillHWRect like this:

HWAccelBlit
{
? ?if ( (dest_surface is screen) &&(screen is NOT doube buffered))
? {
? ? ?wait vsync
? }
? blit here
}

Does any one know how to do this?
thanks!

–
Best wishes,
Jiangshan

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

3 
 if ( (dest_surface is screen)&&(screen is NOT doube buffered))

This is SDL 1.2, right?

If you’re writing an SDL 1.2 driver:

if ( (surface == SDL_VideoSurface) &&
(surface->flags & SDL_DOUBLEBUF) == 0) )

SDL_VideoSurface (a macro) gets you the lowlevel SDL_Surface pointer
that was provided by the driver during SDL_SetVideoMode().

(If this were an external app using SDL, you’d use SDL_GetVideoSurface()
to get the Public surface, which is either what the driver provided in
SDL_SetVideoMode(), or a shadow surface SDL is using to convert between
the application and the driver’s needs.)

In SDL 1.3, this works completely differently.

–ryan.

4

Yes, your code works well!
thanks!

2011/7/18 Ryan C. Gordon :>

? ? if ( (dest_surface is screen)&&(screen is NOT doube buffered))

This is SDL 1.2, right?

If you’re writing an SDL 1.2 driver:

?if ( (surface == SDL_VideoSurface) &&
? ? ?(surface->flags & SDL_DOUBLEBUF) == 0) )

SDL_VideoSurface (a macro) gets you the lowlevel SDL_Surface pointer that
was provided by the driver during SDL_SetVideoMode().

(If this were an external app using SDL, you’d use SDL_GetVideoSurface() to
get the Public surface, which is either what the driver provided in
SDL_SetVideoMode(), or a shadow surface SDL is using to convert between the
application and the driver’s needs.)

In SDL 1.3, this works completely differently.

–ryan.

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

–
Best wishes,
Jiangshan