Re: FT2: ftraster questions

[Just van Rossum]

At 12:25 PM +0100 07-01-2000, David Turner wrote:
>Well, for now, the anti-alias algorithm is fixed to 128 levels of grays
>(from 0 to 127). You can do your own conversion for now, or wait a bit
>for an improved version. However, I must admit that I won't put a lot
>of resources into this problem for now, as I'm pretty satisfied with
>the current results, and still lots of work is needed in other areas..

In the meantime I have solved it myself; it turned out to be pretty easy to
provide an alternative palette for my Mac/QuickDraw pixmap. So for me it
has absolutely no priority.

>Also, have a look at the source code in "demos/graph/grblit.c", it
>contains routines to do this sort of conversion more or less
>automatically. The new graphics sub-system is much more os-independent
>than previously, and can be compiled with absolutely no display/window
>support.

Ah, thanks, maybe this is even better. I'll look into it.

>> - the antialiasing algorithm seems to do horizontal oversampling only (or
>> mainly?). This looks *great* on vertical stems, but not so good on
>> horizontal stems.
>>
>> I've put a showcase for my last two points at
>>   http://www.petr.nl/just/ft2sample.gif
>>
>Well, it the horizontal anti-alias performed is a bit different
>from the vertical one (look at the above picture with a magnifying
>program, and you'll notice that differences in the levels of grays
>used). I'll try to check the code, because theorically, the
>difference should not be visible (probably a bug in there).

Ok. Let me know if and how I can help.

Thanks, it's working pretty great already!

Just