GSoC 2009

[Chris Young]

On Tue, 24 Feb 2009 11:33:13 +0000 (GMT), Michael Drake wrote:

> > > > I get sluggish scrolling on some sites,
> 
> > > Which sites? Scrolling speed is fast here and doesn't vary between
> > > sites.
> 
> > Mostly ones with complicated amounts of imagery - eg.
> > http://www.bbc.co.uk is really slow.
> 
> Did this get fixed?

Not really :(

> I dunno if it's relevant, but I recently updated the info for the tiled
> bitmap plotters:
> 
> http://source.netsurf-browser.org/trunk/netsurf/desktop/plotters.h?r1=6361&r2=6594
> 
> So it now explains what x and y are and that the extents of the repeat (if
> repeating) will be given by the currently set clip rectangle.
> 
> It looks like the Amiga plotters use scrn-Width and scrn->Height for the
> tiled plotting extents. I don't know what they are but the clip rectangle
> will be the size of the visible bit of canvas as a worst case and
> generally smaller.

scrn->Width and scrn->Height are the screen's dimensions, which is
also the size of the off-screen bitmap.  It's not massively different
to the visible area if the window is fully extended.

I think the speed problem is mainly due to alpha blits being very
slow, but I can't speed them up.

Chris