36 lines
1.4 KiB
Diff
36 lines
1.4 KiB
Diff
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diff --git a/doc/misc/efaq.texi b/doc/misc/efaq.texi
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index f5f01848f77f..8f7ed715b523 100644
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--- a/doc/misc/efaq.texi
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+++ b/doc/misc/efaq.texi
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@@ -1595,6 +1595,10 @@ xterm-direct2 xterm with direct-color indexing (old)
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xterm-direct xterm with direct-color indexing
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@end example
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+If Terminfo database is not available, but 24-bit direct color mode is
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+supported, it can still be enabled by defining the environment
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+variable @env{COLORTERM} to @samp{truecolor}.
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+
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Terminals with @samp{RGB} capability treat pixels #000001 - #000007 as
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indexed colors to maintain backward compatibility with applications
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that are unaware of direct color mode. Therefore the seven darkest
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diff --git a/src/term.c b/src/term.c
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index 94bf013f4a07..5cbb092ad177 100644
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--- a/src/term.c
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+++ b/src/term.c
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@@ -4168,6 +4168,15 @@ use the Bourne shell command 'TERM=...; export TERM' (C-shell:\n\
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could return 32767. */
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tty->TN_max_colors = 16777216;
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}
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+ /* Fall back to xterm+direct (semicolon version) if requested
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+ by the COLORTERM environment variable. */
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+ else if ((bg = getenv("COLORTERM")) != NULL
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+ && strcasecmp(bg, "truecolor") == 0)
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+ {
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+ tty->TS_set_foreground = "\033[%?%p1%{8}%<%t3%p1%d%e38;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%d%;m";
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+ tty->TS_set_background = "\033[%?%p1%{8}%<%t4%p1%d%e48;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%d%;m";
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+ tty->TN_max_colors = 16777216;
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+ }
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}
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#endif
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