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Amiga Plus 1995 #5 & #6
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libx11.readme
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1995-08-11
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Some LibX11 info:
--------------------
As you may have guessed, this program uses something I have called libX11 which
is a link library of X11 emulation routines. It tries to provide an easy way
of making programs written for the X11 window system run on the amiga.
To do this I have used a lot of different amiga functions, some of them
may not bee too portable across different configurations (most notably
those with gfx cards). I have been informed that some Blitter functions
doesn't do too well on those gfx cards. The library uses BltPattern/
BltBitMap/BltBitMapRastPort and BltMaskBitMapRastPort both for 1 plane
and >1 plane bitmaps. Some functions also uses the chunky to planar routines
by Morten Eriksen (it may not be the fastest but at least it is general
enough to be useful!) which has been reported not to work on gfx cards.
To prevent these functions from beeing used set 'setenv X11/gfxcard 1'
(not all programs may use these functions!).
Resources
-----------
To handle fonts a file called AmigaDefaults (==.XDefaults) that contains
information on mapping between X11 fonts and amiga fonts, has been made.
(and other info when I improve upon it..environment vars are likely contenders..)
It should be placed in your $HOME. (ex. 'setenv HOME dh1:') or in
$X11HOME if it is defined.
fontmap.courier: courier.font
fontmap.helvetica: helvetica.font
are valid entries into this library where the string between . and : is the
substring that when it matches a requested fontname will map the font into
the fontname following the colon. A program may ask for
"-adobe-helvetica-medium-r-*--" and will in this case receive the helvetica.font.
If you have bitmap versions of the postscript fonts you may insert them
into this file! (in case you are working with xfig..) I guess it should
be possible to convert those fonts into something usable on the amiga
with some of those font editors.
This file can now also contain resource entries that programs will ask
for like 'XMgr.invertDraw: no'. To find out what resources each program
asks for you can turn on debugging with 'setenv X11/debug 1' (hm..will be
'Amiga.debug: true' real soon..) or read the manual!
Cursors
---------
If you don't like the cursors that the applications may choose to use
you can override it with 'setenv X11/Cursors 0'. They may look ugly
but are the default cursors of the X11 window system.
Colors
--------
To provide proper color handling a file called rgb.txt has to be placed in
the same dir as AmigaDefaults (HOME or X11HOME) it contains mapping between
color names and rgb values. (used by XLookupColor/XParseColor and
XAllocNamedColor). Also under os 3.0 pensharing is used to obtain pens.
Without this file programs may decide there wasn't any colors available
and will use black & white.
Other
-------
If you want to run an application on a public screen most of the programs
will react to a command line entry '-display PubScreen'. If it doesn't
'setenv X11/usepub PubScreen' can be used.
Some debug information can be obtained by 'setenv X11/debug 1'. Most programs
also provide its own debug command line option.
setenv X11/askmode 1 is used with xanim to specify the screenmode which the
anim is showed on.