RFR: 8238954: Improve performance of tiled snapshot rendering [v15]

[Kevin Rushforth]

On Wed, 1 Jul 2020 14:29:55 GMT, Frederic Thevenet <github.com+7450507+fthevenet at openjdk.org> wrote:

>> Marked as reviewed by arapte (Reviewer).
>
> I have read Ambarish's code more closely and I am now convinced it is indeed easier to understand; beyond the change
> from "while" to "for" loops, it introduces an extra set of variables which avoids the same "m/b/rTileWidth/Height" vars
> to have to designate different things depending in which loop they're used (M, B, or R). In hindsight, this is why I
> had such a hard time naming them.  I have run the automated tests on Windows and Ubuntu (w/ forceGPU=true) and it
> passes. The benchmark I made also produces similar results. Someone will still need to run the tests on macOS, I'm
> afraid.  If it's not too much of a problem now that the PR's been approved, I think it would beneficial to make the
> change, especially considering that this bit of code might be used as a starting point for other issues requiring
> tiling.

That would be fine with me.

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PR: https://git.openjdk.java.net/jfx/pull/112