[EMAIL PROTECTED] wrote:
Java 6u10 provides a method to modify widow opacity. On older machines, I assume without hardware acceleration, setting a window to the non-opaque mode leads to a very high CPU utilization.
HW acceleration is actually disabled for the window
with opacity < 1.0 on all OS-es but Windows Vista
because of the incompatibility between
DirectX and GDI which were only fixed in Vista.
So if you're on XP the performance you see is from
sw-only rendering.
If you're using non-opaque windows (perpixel translucent),
it's a bit more complicated.
> I wonder if there is a way to check the availability of hardware acceleration?
There are many factors involved in performance in this case
besides hw acceleration (like whether your adapter is AGP or
PCIX) so I don't think it'd help if you just
check if hw acceleration is enabled. For one, it could
be enabled for one window and not another.
In general, one would use
GraphicsConfiguration.getImage/BufferCapabilities() to check
if hw acceleration is enabled. But like I said, they don't have
enough granularity to help.
Thanks,
Dmitri
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