Hi Clemens,
On Jul 15, 2008, at 3:28 PM, Clemens Eisserer wrote:
Hi again,
- The Xrender-pipeline now is almost able to run common swing
applications, copyArea and some bugs are still waiting to be killed,
but more or less it should work after.
Its only the "hack" release where I tried all the stuff out and I plan
to rewrite it starting next week or so, but it would be great if I
could upload it to the OpenJDK repository.
What should I do to get access to it?
There's an hg repository already set up for your Xrender project:
http://hg.openjdk.java.net/xrender/xrender/
I'm not sure the process you need to follow to get commit access to it
(maybe you could ask Mark Reinhold about that on a separate alias,
like the discuss alias?). In theory that should be your sandbox (a
child of the jdk7 master repository) as you work to stabilize your new
pipeline.
- My blit-functions currently are not called if composition with
extra-alpha is requested, although I have registered my Blits with
CompositeType.AnyAlpha. Are there further requirements to get this
accalerated?
Do you know which Blit loop is being called in its place? (You can
use -Dsun.java2d.trace=log to get an idea, or you can just step
through the Blit.getFromCache() method.) I suspect there is another,
more specific Blit loop that's already registered that is being found
before the one you registered, but that's just a guess.
- How does ExtraAlpha influence composition for operators other than
SRC_OVER?
For now I implement extra-alpha as a 1x1 A8 mask, however although the
results are consistent when SRC_OVER is used, when SRC is used the
image gets darker and darker the lower the EA value becomes with
Xrender, but the RI seems to ignore the the extra-alpha value set.
"Extra alpha" has the same behavior for all AlphaComposite instances.
In a nutshell, the extra alpha value gets logically multiplied with
the source before the actual compositing operation. The
AlphaComposite docs explain this process in great detail (look for the
A[sub]ac factor):
http://java.sun.com/javase/6/docs/api/java/awt/AlphaComposite.html
Chris
Thank you in advance, lg Clemens
Blog: http://linuxhippy.blogspot.com/
