Chet,
Thanks for your interest concerning this problem. I will collect all
necessary information in order to fill a complete report. For now all I'm
sure of is that the problem was spotted on Windows XP using JDK 1.4.2.02.
Should I publish it as an answer in this thread or as a separate thread ?
Should I fill a bug report (if so, where should I post it) ?
Regards,
Dimitri
----- Original Message -----
From: "Chet Haase" <[EMAIL PROTECTED]>
To: "Dimitri del Marmol" <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Wednesday, March 16, 2005 3:26 PM
Subject: Re: [JAVA2D] Performance problems on multiple monitors
Hi Dimitri,
Multimon is indeed Java2D functionality (and AWT). In general,
it should be possible to get good performance, including
hardware acceleration, from a secondary monitor; it's not
clear why your application is having this problem.
First of all, I assume you are using some relatively
recent version of Java; the multimon support on
releases prior to 1.4 was somewhat shaky, and has
improved with every release since then.
There is definitely a performance issue for windows that
span the monitors (have visible portions of the window
on both monitors at once); we need to fix this eventually.
But when windows are completely contained on a single monitor,
the amount of performance you see should not be related
to whether you are on the primary or secondary screen.
Note: The performance you see on each monitor may certainly
be different if they come from different graphics devices,
or those displays have different performance characteristics.
For example, if you have a high-end card driving the primary
and a low-end PCI card with little VRAM driving the second
display, then you will definitely see different performance
between the two. But your situation sounds more like a bug where
2D is not doing the right thing to accelerate operations on
the secondary monitor at all (until you move the window back and
forth again).
I can't chase the problem down any more without further
information, but if you can send us more about the
problem we will look into it. Specifically, it would be
great to get:
- The version of Java you are using
- The platform (Windows XP? Linux?)
- The video card driving each display
- A small test case that shows the problem. If you could
do this with a simple Swing app it would be better than some
huge JAI app (just in terms of narrowing down the problem
so that we can reproduce and debug it).
Thanks,
Chet.
Dimitri del Marmol wrote:
Hi everyone,
I noticed a strange behavior in a Swing application using JAI.
The application involves displaying images on JPanels contained in a
JFrame.
Operations allowed on the displayed images involve contrast modification,
zooming, panning...
Multiple monitors are supported.
The strange thing is, if the frame is opened on the second monitor, the
performances of the imaging operations are noticeably slower than when
the frame is opened on the first monitor.
Even stranger: if the frame is dragged across the desktop to the first
monitor and then back to the second, the operations are fast again.
Has anyone noticed a similar behavior ?
I posted this on the JAI-INTEREST mailing list and the answers I received
pointed at Swing/JFC since other users had also experienced this problems
when using other media API's (JMF) and even in "non image-related"
applications. I'm posting it here too since, even though I don't have the
slightest clue to how Multiple Monitors support have been implemented, it
seems to be a Java-2D feature...
Any suggestion is more than welcome :-)
Dimitri
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Dimitri del Marmol
[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>
Telemis s.a.
Tel: +32 (0)10 48 00 14
Fax: +32 (0)10 48 00 20
Avenue du Grand Cortil, 34
B-1348 Louvain-la-Neuve
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