specifier instancing may be misleading [Re: font for jit chars?]
Ilya N. Golubev
gin
Thu Nov 9 12:46:07 EST 2006
Will be mostly unable to check mail until Dec. 12 at least.
> Does specifier-matching-instance give a different result for the font
> compared to this:
>
> face-font-instance
Yes. The following expressions
(setq fia (face-font-instance 'default nil 'jit-ucs-charset-0))
(specifier-matching-instance
(face-font 'default)
(cons (find-charset 'jit-ucs-charset-0) 'initial))
(face-font-instance 'default nil (find-charset 'jit-ucs-charset-0))
would return the same, `eq' values:
#<font-instance "-misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1" on #<x-device on ":0.0" 0xa692a> font id: 0xa0011b, 0xdc3e0>
The expression
(specifier-matching-instance
(face-font 'default)
(cons 'jit-ucs-charset-0 'initial))
would return different value:
#<font-instance "-b&h-lucidatypewriter-medium-r-normal-sans-12-120-75-75-m-70-iso10646-1" on #<x-device on ":0.0" 0xa692a> font id: 0xa00131, 0x107f92>
Also tracked redisplay of jit emchar for unicode code point u+10db in
default face. If jit emchars processing may depend on order in which
they were created, this was the only one created in that xemacs
process duration. It was created by `decode-coding-region' `utf-8'.
`specifier_instance_no_quit -> specifier_instance_1' for this face
font specifier was called only with MATCHSPEC
(#<charset jit-ucs-charset-0 "jit-ucs-charset-0" "Mule charset for otherwise unknown Unicode code points." "Mule charset for otherwise unknown Unicode code points." 96x96 l2r cols=1 g0 final='0' reg=[iso10646-1] 0x476c2> . initial)
SPECIFIER is `eq' to `(face-font 'default)', which was in my xemacs
then with `specifier-spec-list'
((#<x-frame "XEmacs" 0xac5dc> ((x) . "*-*-lucida*-medium-r-*-*-12-*-*-*-m-*-*-*") ((encode-as-utf-8 initial x) . "-misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1") ((initial two-dimensional x) . "-*-*-medium-r-*-*-*-150-*-*-c-*-*-*") ((final one-dimensional x) . "-misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1") ((final two-dimensional x) . "-misc-fixed-medium-r-normal--15-140-75-75-c-90-iso10646-1")) (global ((x) . "*-*-lucida*-medium-r-*-*-12-*-*-*-m-*-*-*") ((encode-as-utf-8 initial x) . "-misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1") ((initial two-dimensional x) . "-*-*-medium-r-*-*-*-150-*-*-c-*-*-*") ((final one-dimensional x) . "-misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1") ((final two-dimensional x) . "-misc-fixed-medium-r-normal--15-140-75-75-c-90-iso10646-1")))
The program had single frame then, one from this list.
That is, `specifier_instance_1' was called as when evaluating one of
the above expressions:
(specifier-matching-instance
(face-font 'default)
(cons (find-charset 'jit-ucs-charset-0) 'initial))
Confirming that `specifier_instance_1' would eventually call
`Fmake_font_instance'.
Confirming that X font id obtained for
`-misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1' was
actually passed to `XDrawImageString16' when redisplaying that emchar.
Will post detailed gdb session transcript snippets on request. How
xemacs displays that emchar does match what `xfd' displays for its
code point in that font, have no reasons to suspect any text mis-
drawing in my core X tools.
So only the value obtained with charset first- class object in
MATCHSPEC pointed to the font actually used for redisplay. The value
obtained with charset name symbol in MATCHSPEC was different,
misleading.
The `Installation' for that build is as follows.
Also observed the same return values in another build, will post its
`Installation' on request.
If different return values are intended, please document. Otherwise,
please fix it. Anyway, please document the right MATCHSPEC's for
`specifier-matching-instance'.
--
uname -a: Linux 2.6.3-27mdk #1 Tue May 31 21:48:42 MDT 2005 i686 unknown unknown GNU/Linux
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