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) can be used to examine the file.

­-d Increase the level of trace detail.  The maximum level is -dd. 

FILES

­/dev/bitblt

SEE ALSO

bit(3), bitmap(6), graphics(2), tweak(1)

Plan 9  —  January 03, 1993