[Swftools-common] some additions to swfc

[Huub Schaeks]

Hello Matthias

I've been hacking at the swftools a bit this week to implement a few 
features I thought might be nice to have.

I added a parameter 'glyphs' to the .font command intended to specify that 
only the specified glyphs are to be imported. This of course helps keeping 
file size down. I only implemented this for true-type font, but I suppose it 
should work similarly for t1 and swf fonts.

I added a parameter called 'ease' to the .change command to specify an 
easing function to be used. In addition I added some extra parameters that 
are used by certain easing functions. I implemented easing functions quit 
similar to Robert Penner's (linear, which is the default, and 30 new ones).

I'm not quite sure about using those functions license wise. Robert Penner 
released his code under the BSD license and I don't know if it is permitted 
to add my code, which is in some way derived from his, in a GPLed program.

If you're interested I can get the current development snapshot and generate 
some patch files sometime this weekend probably.

I was looking a little further because I thought I would like to be able to 
manipulate separate parameters of a character independently. I haven't 
really studied this yet but I guess it would be a handy approach to 
implement keeping track of the 'lastFrame' of each parameter separately in 
the same way the present code keeps track of the 'lastFrame' of each 
instance. You know the code a lot better than I do; would you agree that 
this is a useful approach?

regards
Huub

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