Another way besides adjusting the acceleration threshold
via the property is to "prime" the images before rendering as
you're loading them.
It could be done by rendering an image to a VolatileImage until
the former becomes "accelerated" as reported by Image.getCapabilities()
(or until a certain threshold, say, 3, is met, so that you don't loop
forever if an image can't be cached in vram for one reason
or another).
Also, prior to doing all that you might want to check if the
VolatileImage you have is accelerated (also via
getCapabilities()).
Thanks,
Dmitri
Java2D Team
[EMAIL PROTECTED] wrote:
I am having problems getting the performance I want when drawing images.
I load a BufferedImage using ImageIO then draw it to a JPanel using the
Graphics2D.draw(Image, AffineTransform, ImageObserver) method. The first time I
draw this image it is much slower than subsequent calls. I think that the
BufferedImage becomes 'Managed' through the creation of a CachingSurfaceManager
that creates an accelerated SurfaceData object (I have be looking at the Java
source).
I want my calls to drawImage to be as fast as possible (I am scrolling an area
with many images drawn on it in various places). So much so that if I have not
got an accelerated BufferedImage already then I will skip drawing it and return
to it later. I currently load the image from file in a separate Thread and it
is here that I want to explicitly make the BufferedImage 'Managed'. I thought
that I was there by explicitly calling validate(gc) on the
CachingSurfaceManager for the image, but that did not work. The first call to
draw is still much slower.
The other option was to create a VolatileImage and draw that. The problem is
that I need it to work just as well with the opengl and d3d rendering pipeline.
OpenGL is fine, D3D for some reason is slow.
I am using JDK6. Any help would be appreciated.
Regards,
Alistair
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