Getting Amount of Free Accelerated Image Memory
Images in accelerated memory are much faster to draw on the screen.
However, accelerated memory is typically limited and it is usually
necessary for an application to manage the images residing in this
space. This example demonstrates how to determine the amount free
accelerated available.
Note: There appears to be a problem with
GraphicsDevice.getAvailableAcceleratedMemory() on some systems.
The method returns 0 even if accelerated image memory is available. A
workaround is to create a temporary volatile image on the graphics
device before calling the method. Once the volatile image is created,
the method appears to return the correct value on all subsequent
calls.
See also Enabling Full-Screen Mode and
Creating and Drawing an Accelerated Image.
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
try {
GraphicsDevice[] gs = ge.getScreenDevices();
// Get current amount of available memory in bytes for each screen
for (int i=0; i<gs.length; i++) {
// Workaround; see description
VolatileImage im = gs[i].getDefaultConfiguration().createCompatibleVolatileImage(1, 1);
// Retrieve available free accelerated image memory
int bytes = gs[i].getAvailableAcceleratedMemory();
if (bytes < 0) {
// Amount of memory is unlimited
}
// Release the temporary volatile image
im.flush();
}
} catch (HeadlessException e) {
// Is thrown if there are no screen devices
}
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