[Bug awt/26486] New: Graphics.fillRect extremely slow

[hendrich at informatik dot uni-hamburg dot de]

Compile and run the attached testcase. Use the "-sleep <millisecs>" parameter
to specify the sleep delay between repaints, e.g.

java FillRect -sleep 50     (20 frames/second nominally)
java FillRect -sleep 10     (100 frames/second)
java FillRect -sleep  1     (1000 frames/second)
java FillRect -sleep  0     (no repaints at all)

On my system (Athlon 2600+, Suse 8.2), the animation runs at about 
50 frames/second max. on the reference implementation, but runs at a measly 
3..5 frames/second on jamvm+classpath cvs 2006.02.24 or gcj 4.2.0.

Note that the animation only uses Graphics.setColor() and Graphics.fillRect()
with 3x3 pixel rectangles. For a more fancy animation, see my "GameOf Life"
testcase submitted to http://gcc.gnu.org/ml/java/2006-02/msg00194.html. 
(Consider that testcase as GPLed, too.)

- Norman


-- 
           Summary: Graphics.fillRect extremely slow
           Product: classpath
           Version: 0.21
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: awt
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hendrich at informatik dot uni-hamburg dot de


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26486