[OpenJDK 2D-Dev] One or many GraphicsConfiguration(s) per toplevel?

Anthony Petrov Anthony.Petrov at Sun.COM
Wed Jan 21 18:03:46 UTC 2009

Hi Dmitri,

On 1/21/2009 8:43 PM Dmitri Trembovetski wrote:
>> implementation of this method in the Container class that recursively 
>> calls this method for every child of the container.
>> The question is: is it really possible for one toplevel to contain 
>> components having different GraphicsDevice's (and/or different 
>> GraphicsConfiguration's)? Or may I assume that all and every 
>> descendant components of a toplevel window use the same GC that the 
>> window uses (and therefore the Container.checkGD() may safely be 
>> removed)?
>   We should enforce that all components within a toplevel have the
>   same GC. If checkGD does that I wouldn't remove it.
"Asserts" are fine as long as they are simple and fast. But if we're 
sure we don't have several GC/GDs per toplevel window, then I don't see 
much reason to waste time recursively traversing the whole hierarchy of 
components of a container when it gets added to another container.

Perhaps it would make sense to move the graphicsConfig member to
the Window class and use its value for
Component.getGraphicsConfiguration()? A component not currently
contained in a toplevel window obviously should have a null GC.  Thoughts?

best regards,

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