[xmlroff] X11 colours

[Tony G. <Ton...@Su...>]

The code now in CVS implements mapping the X11 colour names to FoColor
objects.

I also added fo_color_new_with_value() so that colours are immutable
once created, and I put a hash table (actually, a FoHashTable) in
FoColorClass so there's only ever one instance of a particular colour.

Along the way, I added FoHashTable as an object-aware hash table type
and added fo_object_equal() and fo_object_hash() so every FoObject so
every FoObject type can define its own equality and hash functions.

I also discovered that fo_color_get_color_fuschia() has been returning
purple for I don't know how long.

If anyone has time to write a test case, we need a test case or two to
test the X11 colour support (although not every colour unless you're
really enthusiastic).  I would suggest a property/color/color2.fo to
keep it separate from the spec-defined colours in
property/color/color1.fo.

Given my recent experience with fuschia, I would also suggest that the
test case include both the colour specified by name and the colour
specified by value to make sure the right colour is being found when
specified by name.

Can someone create such a test case?

Regards,


Tony.