Re: [pygame] Fill doesn't seem to work as expected.

["Charlie Nolan" <funnyman3595@xxxxxxxxx>]

It's a bit confusing at first, until you realize what fill is: It's a
way to set large numbers of pixels to the same value, completely
ignoring whatever was there before.  Since this is a write-only,
no-decision operation, it's very fast.  The flags are just extra
attributes that you're setting, beyond the normal RGBA.

The correct method is, as you discovered, to blit another surface onto
the first one.  Alternatively, you could try iterating through a
surfarray, which might be faster, since you don't have to read another
surface.

-FM

On 8/29/08, Ron Dippold <sizer@xxxxxxxxxx> wrote:
> This is pygame 1.8.1 on WinXP, DX9.
>
> I'm trying to dim the entire window for a pause screen. It seems like the
> logical way to do this would be to
>
>     # screen = pygame.display.set_mode( (800,600), 0 )   at start of program
>     screen.get_surface().fill( (100,100,100), None, BLEND_MULT )
>
> but this results in everything being turned hideously green/cyan (and not
> dimmer at all). It doesn't seem to matter whether I use BLEND_RGB_MULT,
> BLEND_RGBA_MULT, or even ADD/SUB instead of MULT, or specify the rect
> instead of None.
>
> What does work is to do:
> 	dim = pygame.Surface( screen.get_size() ).convert()
> 	dim.fill( ( 100, 100, 100 ) )
> 	screen.blit( dim, (0,0), None, BLEND_MULT )
> which does exactly what I'd expect.
>
> Am I missing something on the .fill method? I can use the workaround, so
> this is just curiosity.
>
> Ron
>
>
>
>