Need for Speed - image creation & rendering

Java 2D
#1

Hi,
I need any advice to squeeze more performance out of my application. My app receives a 2-d array of doubles, from which I need to create an image. It receives a new array once every second. This image is then continuously rendered (trying to maintain 30fps) to a JPanel, each frame scrolling down. (i.e. to represent a top-down view of the ground scrolling by).
I am currently converting the 2-d array of doubles to a 2-d array of int pixels, then create a BufferedImage (TYPE_INT_ARGB) and call setRGB with the int array.
Then another thread is calling repaint() which scrolls the image at the desired fps. From what I can gather from this forum is that I may not be getting accelerated images, and that would greatly increase the painting of the image each frame. Is there a way to create an accelerated image from this int array (as opposed to loading it from a file)?

Any help is appreciated,

Cory

#2

First off, try doing active rendering instead of calling repaint. You might want to take a look at using BufferStrategy as well, especially if this is a full screen app. Lastly, use Component.createImage() or GraphicsConfiguration.createCompatibleImage(), since these methods create buffered images that can be accelerated (also called “Automatic Images” by some of the folks on this board).

#3

Also, you might try to profile your app by using the -Xprof switch to make sure what the bottlenecks are.
Maybe the array of doubles and conversion to ints is expensive for example.

Erik

#4

Thanks for your help! Once I switched to active rendering, and used VolatileImages, my framerate jumped to ~250 fps!
Thanks again, this forum is great, I wish I would have found it sooner.

Cory