BTRACE(8) BTRACE(8)
NAME
btrace - trace bitblt protocol
SYNOPSIS
btrace [ -d [ d ]] [ -o ofile ] [ -b bfile ]
DESCRIPTION
Btrace eavesdrops on messages to and from /dev/bitblt,
interprets them as messages in the bit device protocol (see
bit(3)), and prints a readable version of the messages on a
trace file, btrace.out by default. After btrace is started,
it runs in the background, tracing all subsequent graphics
programs run in that window. Options for btrace are:
-o ofile Print trace output in ofile instead of btrace.out.
-b bfile Dump each bitmap read or written to bfile, using
the format of bitmap(6). Each succeeding bitmap
overwrites the previous contents of file. Tweak(1)
or showimage(7) can be used to examine the file.
-d Increase the level of trace detail. The maximum
level is -dd.
FILES
/dev/bitblt
SOURCE
/sys/src/cmd/btrace.c
SEE ALSO
bit(3), bitmap(6), graphics(2), tweak(1), showimage(7)