<AWT Dev> [9] RFR: 6477756: GraphicsDevice.getConfigurations() is slow taking 3 or more seconds

Vadim Pakhnushev vadim.pakhnushev at oracle.com
Tue May 17 18:07:06 UTC 2016

On 17.05.2016 19:01, Sergey Bylokhov wrote:
> On 17.05.16 18:54, Vadim Pakhnushev wrote:
>> For me this bug reproduces only when running through the RDP and with
>> -Dsun.java2d.d3d=false flag.
>> Basically each DescribePixelFormat takes about 40-60 ms when running
>> without hardware acceleration because it calls LoadLibrary/FreeLibrary
>> for opengl32.dll every time.
>> So the fix is to cache the handle to the dll.
> It is needed even in case of d3d=true?
> (D3DGraphicsDevice extends Win32GraphicsDevice)

Not really. Although I don't see any harm to it.
Anyway, I think that this fix could be made even more concise provided 
that we don't free the handle.
So I moved this code to the 
Java_sun_awt_Win32GraphicsDevice_getMaxConfigsImpl which is not called 
in case of d3d:



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