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)

Plan 9  —  April 04, 1995