[OpenJDK 2D-Dev] [OpenJDK Rasterizer] Openjdk java2d rasterizer JEP for pisces (marlin) enhancements ?

Jim Graham james.graham at oracle.com
Sat Mar 7 01:28:05 UTC 2015

We should probably focus on a single Mailing List for code reviews. 
This particular review is not necessarily specific to the rasterizer, so 
it should probably have only been sent to the 2d-dev list (Path2D is 
owned by 2D).

Also, please start a new thread for code reviews (and new topics).  This 
code review will now be forever threaded with the long discussion about 
rasterizer optimizations because it shares too many headers with the 
other thread... :(


On 3/6/15 10:35 AM, Laurent Bourgès wrote:
> Jim,
> Here is my first "official" webrev (vs graphics-rasterizer forest)
> concerning Path2D copy constructors:
> http://cr.openjdk.java.net/~lbourges/webrev_Path2D_0/
> this is a simple Path2D patch to trim arrays (numTypes & float/double
> Coords) in copy constructors (Path2D.Float and Path2D.Double variants)
> with the requested test: Path2DTrimCopy.
> Please tell me if the test is correct as I do not run it with jtreg
> (annotations ?)
>     2015-02-25 2:05 GMT+01:00 Jim Graham <james.graham at oracle.com
>     <mailto:james.graham at oracle.com>>:
>         Those changes were exactly what I was referring to.  I don't see
>         why we shouldn't make trimmed arrays when copying the shape.
>         I'm pretty sure that the copy constructors are going to be
>         overwhelmingly used to make a protected copy of an existing
>         shape/path2d which is likely meant mostly for reading.  In
>         particular, in the case of the return value from
>         createStrokedShape() I don't think the intention is to create
>         the shape and then scribble on it, the intent is to treat the
>         answer as if it were immutable - at least the 99.9% case - so I
>         think a perfectly sized shape is OK.
>         Be sure to add a test case that creates an empty Path2D, clones
>         it, copy constructs it (to both .Double() and .Float() variants)
>         and then tries to add new segments to it - to make sure that the
>         array growth code doesn't get ArrayIndexOutOfBounds exceptions
>         due to making assumptions about the lengths of the arrays (I
>         eyeballed the makeRoom() code and it looks good, but we should
>         test it if we are making arrays that are potentially zero length
>         or very tiny)...
> Laurent

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