RFR: 8332895: Support interpolation for backgrounds and borders [v3]

[Michael Strauß]

On Fri, 2 Aug 2024 21:22:09 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

>> Michael Strauß has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - fix since tag
>>  - adjust table styling
>
> modules/javafx.graphics/src/main/java/com/sun/javafx/util/Utils.java line 230:
> 
>> 228:      * shallow-equal to the list that is passed into this method, i.e. its elements are references
>> 229:      * to the same objects. The existing list is returned in this case.
>> 230:      */
> 
> Was there a performance problem here?
> 
> Allocating 8 locals should be equivalent to an array of 8 elements that never escapes (ie. JIT optimizes this). Then either JIT is smart enough to conditionally allocate a heap object and copy the array there, or you can help it by cloning that local array and letting only the clone escape.

There's no performance problem in the sense that my test application runs slowly in any noticeble way. It's one more piece of trying to minimize the allocation of objects in the very common case where nothing has changed.

Do you think it is preferrable to appeal to JIT magic instead of explicitly coding the behavior? With your other suggestion of using `switch`, the code looks much cleaner already.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1522#discussion_r1702668699