On Mon, 25 Feb 2002, Angus Leeming wrote:
> void GImageXPM::scale(GParams const & params)
> {
> if (!xpm_image_)
> return;
>
> }
The principle behind scaling is simple: It's raytracing.
So, for each destination pixel, calculate which pixel it corresponds
to in the source picture.
>From this point on, the rest is just optimizations, and you
do not need those for starters.
I think you can manage from this point. If not, I can provide
you with the needed bits.
If you want to make it nice, you also do linear interpolation
in the case of floating source coordinates.
Help this helps,
Asger
