[OpenJDK 2D-Dev] Open Source rasterizer

Jim Graham Jim.A.Graham at Sun.COM
Thu Oct 4 00:29:31 UTC 2007

As Roman mentioned earlier, I've culled together some code from another 
Java project into a replacement for the encumbered Ductus renderer in 
the production JDK.

This rasterizer is built from all of our own code so we can release it 
as part of the Open JDK project.

Unfortunately, it isn't as fast as the existing Ductus binary plugs so 
some work will be needed to improve its speed, but it covers the entire 
API that we used to rely on Ductus for so we've removed the binary plugs 
from the Open Source version.  Here are some known issues with the new 
rasterizer that need to be addressed:

- Performance, performance, performance
- It uses fixed point without much overflow detection/handling
- It does not honor the STROKE_CONTROL hints so thin lines are vague

In terms of performance, someone who is good with a code analyzer could 
have a field day, but here are some ideas that would be reasonably easy 
to investigate to see if they make a noticeable improvement in the 

- reusing the Renderer and associated objects vs. recreating them
- A better storage format for the PiscesCache for generating tiles
- Tighter integration between the pixelization code and the cache
- use floats in the line widening which should go faster on desktops

I'm attaching a zip file of the sources for a sneak peek.  These sources 
should appear in the public repository in a few days (just barely 
beating the temporary freeze for the Mercurial transition).

I'd recommend anyone interested in playing with this code to join the 
"Graphics-Rasterizer-Dev" list on openjdk:


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