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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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------- You are receiving this mail because: -------You are the assignee for the bug, \
or are watching the assignee.         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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