[OpenJDK 2D-Dev] X11 uniform scaled wide lines and dashed lines; STROKE_CONTROL in Pisces

Jim Graham james.graham at oracle.com
Thu Sep 2 22:29:47 UTC 2010

Use which?  The stroking code or the rendering code?

I believe that the way I set it up was that Pisces replaced both the 
stroke widening/dashing code and the AA renderer - both were parts that 
we relied on Ductus for.  But, the widening code would talk to one of 
our other existing rasterizers for non-AA.  Look at LoopPipe.draw(sg2d, 
s).  It (eventually) calls RenderEngine.strokeTo() directed at a 


On 9/2/2010 3:20 PM, Denis Lila wrote:
>> Do we use Pisces for non-AA?  Pisces should clock in slower for AA than
>> non-AA, but I think we use one of the other pipes (not Ductus) for
>> non-AA and maybe it just isn't as good as Pisces?
> We definitely use it for non-AA.
> I traced it.
> Denis.
> ----- "Jim Graham"<james.graham at oracle.com>  wrote:
>> On 9/2/2010 2:43 PM, Denis Lila wrote:
>>> Actually, I had a question about the test I wrote which takes 20
>> seconds. When
>>> I turned antialiasing on, the test dropped from 20 seconds to 2.5.
>> This is very
>>> puzzling, since antialiasing is a generalization of non-antialiased
>> rendering
>>> (a generalization where we pretend there are 64 times more pixels
>> than there
>>> actually are). Of course, the paths followed after pisces for AA and
>> non-AA are
>>> completely different, but whatever came after pisces in the non-AA
>> case would
>>> have the same input as Renderer has in the AA case (input gotten
>> from Stroker).
>>> Can you take a guess as to what was causing such a large
>> difference?
>> I think Pisces was integrated only as a Ductus replacement which means
>> it was used only for AA, but check if I'm mistaken...
>> 			...jim

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