Re: [pygame] Background texture

[Pete Shinners <pete@shinners.org>]

Choplair wrote:
> I've a 800*600px window and I want put in the background a small
> image texture which is 10*10px!
>
> Can you tell me how I can fill this texture in a all the window
> (without creating a big 800*600 image.. T_T) ?
the way to do this would be tile the image by hand. if your performance 
needs aren't too tight a generic function would do the trick, i think i 
can whip one up right in this email..

def tileblit(src, dst):
    srcw, srch = src.get_size()
    dstw, dsth = dst.get_size()
    for y in range(0, dsth, srch):
        for x in range(0, dstw, srcw):
            dst.blit(src, (x, y))

the biggest optimization you'd probably want is to limit this blit to a 
rectangular area. it is easy to use this with a full sized background 
image, but a bit of extra work for the tiling. here is a function that 
should do it.

def tileblitarea(src, dst, rectarea):
    srcw, srch = src.get_size()
    oldclip = dst.get_clip()
    dst.set_clip(rectarea)
    top = rectarea.top - rectarea.top % srch
    left = rectarea.left - rectarea.left % srcw
    for y in range(top, rectarea.bottom, srch):
        for x in range(left, rectarea.right, srcw):
            dst.blit(src, (x, y))
    dst.set_clip(oldclip)

these tile blitting functions will work for source images of any size.