[Fwd: dead keys treatment using XmbLookupString]

[Mauro Carvalho Chehab]

Rikki,

    May be... Wine uses the idea to map keys into vkeys and then mapping 
back to keys... If something goes wrong on this proccess, it could 
produce strange results...
    I can give you some new ideas, but as far as I never seen an 
Icelandic keyboard, and of course don't have one to hack, you have to 
try some hacking by yourself. I advice you to try (on this order):
        1) May be your keyboard layout is not like a pure QWERTY 
keyboard. On Brasilian keyboards, we have 49 "main" keys instead of 48. 
So, I had to include this new key on the layout, generating the 
'main_key_scan_abnt_qwerty' and the corresponding 
'main_key_vkey_abnt_qwerty' tables, mapping the virtual key VK_OEM_8 to 
the new key (c cedilla), after ASFGHJKL. You can see these on the 
current Wine-CVS code. Please notice that the routines that maps keys to 
vkeys espects to receive some specific VK_OEM_<n> codes for some keys, 
like '\' (mapped as VK_OEM_7) on X11DRV_InitKeyboard. In fact, the only 
available VK I found was VK_OEM_8.
        2) on ToUnicode (with my patch applyied), what is the return of 
ret=XmbLookupString? Please notice that, if the return is zero, it will 
use the Xlib function  'MultiByteToWideChar' after running a code to map 
the dead keys. Maybe the KEYBOARD_MapDeadKeysym is not treating your 
dead_circumflex keycode correctly.
        3) For brazilian keyboards I need only to change XLookupString 
to XmbLookupString on KEYBOARD_ToUnicode function, in order to use XKB 
treatment instead of Xlib, but there are some other points where that 
function is used. Looking at a glance, I haven't found any reason to 
change, but you can try to understand better the other calls.

    I hope these comments can help you.

Mauro.

Richard Allen wrote:

>On Mon, Jan 13, 2003 at 12:07:10PM -0200, Mauro Carvalho Chehab wrote:
>
>I've been studying this quite a bit.  With this patch, I've verifyed that
>some of the dead keys work, and some not.   If I change the IS keymap
>so Im using dead_circumflex instead of dead_acute, then dead (accented)
>characters do work, but obviously not the right ones.
>This leads me to think that dead_acute characters are handled differently
>by wine than dead_circumflex characters are.
>
>Mauro, do you think I could be on to something here ?
>
>
>
>  
>
>>Rikki,
>>
>>   As far as I know, wine keyboard.c uses XFree86 Keymap table to 
>>compare your key definitions with their internal geometry. After that, 
>>it maps every scan code to a virtual key. The virtual key  is mapped 
>>back to a scan code and to an unicode symbol by ToUnicode function. 
>>During this proccess, it uses part of the original xfree mapping.
>>   On the original ToUnicode function, it uses the function 
>>XLookupString (a Xlib function) to map scan code->symbol. This function 
>>is capable to work with latin characters, but it doesn't implement dead 
>>keys translation on the current XFree86 implementations. In the past, 
>>there was some Xlib hacking that changes this behavor (X11 R5 
>>implementations). The new standard (X11 R6) creates the xkb extensions, 
>>that provides new functions to treat locale imput data (XmbLookupString, 
>>Xutf8LookupString and XwcLookupString). What it does is to use XFree86 
>>locale settings to make this map.
>>   The dead key treatment is defined on /usr/X11R6/lib/X11/locale.
>>   The geometry of their keyboards, used by xkb, are on 
>>/usr/X11R6/lib/X11/xkb (RedHat) or /etc/X11/xkb (Mandrake). The file 
>>symbols/is, for example, contains some icelandic definitions.
>>   From your answer, I would try to fix the XFree86 keyboard mapping on 
>>symbols/is. I guess that this will solve both XFree and Wine (patched).
>>    
>>
>
>  
>


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