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List:       konsole-devel
Subject:    [Konsole-devel] [Bug 107487] Please add the xterm-256 colour
From:       <awendt () putergeek ! com>
Date:       2006-06-07 5:40:14
Message-ID: 20060607054014.24790.qmail () ktown ! kde ! org
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http://bugs.kde.org/show_bug.cgi?id=107487         



------- Additional Comments From awendt putergeek com  2006-06-07 07:40 \
-------> So a parameter substring is 0-9 and the colon. The semicolon \
separates> sub-parameters. Thus 48:5:<Color> would be one sub-parameter, \
and> 48;5;<Color> many independent, each having an independent meaning in \
case> of a selective parameter.

I think you may be onto something here with the colons... I was able to \
                find ITU T.416 (which is the same as ISO 8613-6) and it \
                says:
--- snip ---
The parameter values 38 and 48 are followed by a parameter substring used \
to select either the character foreground "colour value" or the character \
background "colour value". A parameter substring for values 38 or 48 may be \
divided by one or more separators (03/10) into parameter elements, denoted \
as Pe. The format of such a parameter sub-string is indicated as:  Pe : P \
... Each parameter element consists of zero, one or more bit combinations \
from 03/00 to 03/09, representing the digits 0 to 9. An empty parameter \
element represents a default value for this parameter element. Empty \
parameter elements at the end of the parameter substring need not be \
included. The first parameter element indicates a choice between:
           0   implementation defined (only applicable for the character \
foreground colour)           1   transparent;           2   direct colour \
in RGB space;           3   direct colour in CMY space;           4   \
direct colour in CMYK space;           5   indexed colour. If the first \
parameter has the value 0 or 1, there are no additional parameter elements. \
If the first parameter element has the value 5, then there is a second \
parameter element specifying the index into the colour table given by the \
attribute "content colour table" applying to the object with which the \
                content is associated.
--- snip ---
The separator character 03/10 they use is a colon, not a semicolon... I \
wonder if the xterm implementation was based on an improper reading of the \
standard? My reading actually makes me think that the correct format would \
be 38;5:x to set colour x. In other words, a semicolon, then a colon. Here \
is my thinking: 1. The first sentence starts with "The parameter values 38 \
and 48 are followed by a parameter substring used to [...]". And ECMA-48 \
section 5.4.2 tells us that a parameter string is a series of parameter \
substrings separated by 03/11 (semicolon). So since 38 and 48 are followed \
by a parameter substring, it should have a semicolon after it. (You may \
object to this first point by saying that the ITU standard and ECMA \
standard possibly define terms like "parameter substring" differently, but \
ITU T.416 doesn't define such things at all. Instead it says they are \
"defined in ISO 6429", and the ECMA-48 "brief history" section (page 5)  \
seems to say that ECMA-48 and ISO 6429 are the same document.) 2. The \
quoted text above also calls the 5 in 38;5:x the "first parameter element" \
in the list separated by 03/10 (colon). If it's the first in a list of two \
"parameter elements", then the first colon should be after it to separate \
these two elements. If my reading is correct, then the ISO/ITU standard has \
already broken the "associativity" of the SGR parameters when used with 38 \
and 48. In light of that, I think you might as well support setting colour \
the Xterm way as well as the ISO standard way, since both ways are \
non-associative and by now a lot of software expects things to work the \
Xterm way. Xterm also supports redefining the colours in the 256-colour \
palette, with a command like this:echo -e '\033]4;65;rgb:ff/00/00\033\\' \
The 6x6x6 colour cube is just a convenient default. If Konsole gets \
256-colour support, it might be good to support those kinds of \
palette-setting sequences, \
too._______________________________________________konsole-devel mailing \
listkonsole-devel@kde.orghttps://mail.kde.org/mailman/listinfo/konsole-devel



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