For the folks following this thread, Rob brought up a good question.
He suggested that I verify that I was, in fact, receiving the
BufferedImage instances that I thought I was getting. In my first
reply to Rob (see below), I provided information that was present in
the documentation for the library that was generating the Images.
That documentation indicated that "createCompatibleImage()" was being
used to generate BufferedImage objects (don't worry -- this is not an
Apple or Sun developed library).
Apparently, the library documentation has not been updated, because
when I check the type of the returned objects in the debugger, I find
that I am receiving "apple.awt.OSXImage" instances, not the
BufferedImage instances I expected. I then wrote a little test
program, and I found that "apple.awt.OSXImage" instances are returned
by the java.awt.Toolkit.createImage() method.
So, perhaps we have an explanation here. I've found that flush()ing
my images made a big difference in my program's ability to reclaim
memory, but, as we thought we were using BufferedImages, we were
unable to determine why this action would matter for that particular
java.awt.Image variant. In fact, it would seem that this library
method I am using is not returning the promised BufferedImage, but
instead a different Image subclass. Hence, the flush() method is
useful for the actual instance returned.
I suppose the lesson learned here is that if you only know you're
going to acquire some generic java.awt.Image subclass, go ahead and
make arrangements to flush() it.
Regards,
-Mike Ellis
On Mar 29, 2006, at 11:21 AM, Michael Ellis wrote:
On Mar 29, 2006, at 11:13 AM, Rob Cope wrote:
Given what others have observed about BufferedImage.flush(), I'm
wondering how you are creating your BufferedImages. If you are
having the component create it, or calling createCompatibleImage
(), then maybe you are getting a subclass of BufferedImage that
does something different? Sorry, I haven't got time to test that
right now, but it would interesting to know.
Rob
Hi Rob.
This is an excellent question, indeed. It is definitely worth
mentioning that I am using the "createCompatibleImage()" method of
the Component's top-level container (JFrame) to create the
BufferedImage instances.
If I get a second later on, I'll determine exactly which Class is
being returned by that method.
Regards,
-Mike Ellis
=========================
Michael F. Ellis
President
Ellis Softworks Inc.
----------
Phone: (941) 713-0361
Email: email@hidden
Web: http://www.ellissoftworks.com
=========================
Michael F. Ellis
President
Ellis Softworks Inc.
----------
Phone: (941) 713-0361
Email: email@hidden
Web: http://www.ellissoftworks.com
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