From: Daniel Colascione <dancol@dancol.org>
To: 10397@debbugs.gnu.org
Subject: bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround
Date: Thu, 29 Dec 2011 06:05:53 -0800 [thread overview]
Message-ID: <69c9ec930ef1d48655624d437aa66d0fce275d3e.1325166766.git.dancol@dancol.org> (raw)
Under remote desktop, Windows returns the wrong number of colors from
GetDeviceCaps (hdc, NUMCOLORS). I hit this bug myself, and MSDN
comments seem to indicate that others hit it as well. The workaround
seems harmless: on non-palettized displays, calculating the number of
display colors based on display bitness should produce good results.
---
src/w32fns.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/src/w32fns.c b/src/w32fns.c
index 822e353..4b94f16 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -4510,7 +4510,10 @@ If omitted or nil, that stands for the selected frame's display. */)
if (dpyinfo->has_palette)
cap = GetDeviceCaps (hdc, SIZEPALETTE);
else
- cap = GetDeviceCaps (hdc, NUMCOLORS);
+ // GetDeviceCaps (NUMCOLORS) is buggy under remote desktop and sometimes
+ // returns the number of system reserved colors (20) instead of
+ // the actual number of available colors.
+ cap = -1;
/* We force 24+ bit depths to 24-bit, both to prevent an overflow
and because probably is more meaningful on Windows anyway */
--
1.7.5.1
next reply other threads:[~2011-12-29 14:05 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-29 14:05 Daniel Colascione [this message]
2011-12-29 16:13 ` bug#10397: [PATCH] Under Remote Desktop, NUMCOLORS is unreliable; workaround Juanma Barranquero
2011-12-29 16:23 ` Daniel Colascione
2011-12-29 16:27 ` Juanma Barranquero
2011-12-29 16:42 ` Daniel Colascione
2011-12-29 16:45 ` Juanma Barranquero
2011-12-29 22:59 ` Daniel Colascione
2011-12-29 23:10 ` Juanma Barranquero
2011-12-29 23:13 ` Daniel Colascione
2011-12-29 23:18 ` Juanma Barranquero
2011-12-30 3:07 ` Juanma Barranquero
2011-12-30 3:18 ` Daniel Colascione
2011-12-30 8:51 ` Eli Zaretskii
2011-12-30 9:00 ` Eli Zaretskii
2011-12-30 12:24 ` Juanma Barranquero
2012-08-07 17:13 ` Eli Zaretskii
2012-08-07 17:33 ` Daniel Colascione
2012-08-07 18:07 ` Eli Zaretskii
2016-02-25 6:25 ` Lars Ingebrigtsen
2016-12-13 0:04 ` Glenn Morris
2011-12-30 1:04 ` Jason Rumney
2011-12-30 1:10 ` Daniel Colascione
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