Notes from Spot. Hi Varthall, I found what you need to finish that port.
Enjoy!

Thanks mate, much appreciated ^^ /Varthall

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Fading

This little page is about fading. It describes the technique which slowly lets
an image appear or disappear from the screen. A split-off from the "appear"
techique is called a cross-fade. Most people (including myself) like these
tricks because it looks so cool.

The regular apprauch is that each frame during a fade, all RGB values of the
pixels get modified by a certain amount, which makes the screen become darker or
brighter (depends on the fade-option).

There are two disadvantages to this apprauch:
Pixel-operations are slow, especcialy when done in video memory
Pixel-operations depend on the bit depth. Each bit-dept (8, 15/16, 24, 32) needs
it's own implementation
In this page, I'd like to show another way to make a fade. (I explain it for
fading out, but for fading in it's just the other way around.) Alphablending. In
stead of making the screen-surface darker, we go blend a black surface over it.
If we slowly increase the aplha value from 0 (not visible ) to 255 (fully
visible), the screen seems to get darker and darker, simulating a fade-out.

When this technique is beeing used on a modern videocard, where alphablending is
hardware accelerated, you have the fade almost for free, and for each bit-dept.
:-)

 PERMSSN    UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 1332    2637  50.5% -lh5- ef4f Jul 30  2002 fadingv3/Docs/fading.htm
[generic]               160609  390988  41.1% -lh5- fae7 Oct  9  2006 fadingv3/fading.exe
[generic]                19184  975798   2.0% -lh5- 4f6b Sep 28  2002 fadingv3/img1.bmp
[generic]                 1395  921654   0.2% -lh5- c184 Sep 28  2002 fadingv3/img2.bmp
[generic]                 1482    6332  23.4% -lh5- 8626 Sep 30  2002 fadingv3/Source/fading.c
[generic]                  249     533  46.7% -lh5- d7cd Sep 30  2002 fadingv3/Source/fading.h
[generic]                  790    2291  34.5% -lh5- af0a Sep 28  2002 fadingv3/Source/main.c
[generic]                   90     104  86.5% -lh5- 6eed Oct  5  2002 fadingv3/Source/Makefile
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         8 files  185131 2300337   8.0%            Feb 13 06:32