Re: [Freeciv-Dev] Changes request

[Daniel Burrows <Daniel_Burrows@xxxxxxxxx>]

On Tue, Jul 13, 1999 at 07:02:05PM -0500, hop@xxxxxxxxxxxxxxxxx was heard to 
say:
> Just remember, that Xpm has built-in capability for making transparent
> pixels so your images can be non-rectangular in shape. If you don't have
> built-in support for transparent images, it plain sucks doing it the hard
> way. And by the hard way, you have to build a bitmask that tells which
> pixels should be drawn, then bitwise AND the bitmask with the current
> display, then XOR'ing the resulting image with the icon you want to draw.
> Using a format with built-in support for transparent pixels is very
> nice because then you don't have to use customized drawing routines,
> just xpm library calls.
> 
> I don't think PNG can have transparent pixels. I hope I'm mistaken.
> If PNG doesn't support transparent pixels, then you'll have to use
> another format that does use transparent pixels, or roll your own
> parser for the XPM format (whee!).
> 
> Justin Hopkins

  Actually, I believe that PNG files can have a full alpha channel, which would
make for really interesting Freeciv graphics :)

  Daniel

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