RFR: 8238954: Improve performance of tiled snapshot rendering [v16]

[Frederic Thevenet]

> Issue JDK-8088198, where an exception would be thrown when trying to capture a snapshot whose final dimensions would be
> larger than the running platform's maximum supported texture size, was addressed in openjfx14. The fix, based around
> the idea of capturing as many tiles of the maximum possible size and re-compositing the final snapshot out of these, is
> currently only attempted after the original, non-tiled, strategy has already failed. This was decided to avoid any risk
> of regressions, either in terms of performances and correctness, while still offering some relief to the original
> issue.  This follow-on issue aims to propose a fix to the original issue, that is able to correctly decide on the best
> snapshot strategy (tiled or not) to adopt before applying it and ensure best performances possible when tiling is
> necessary while still introducing no regressions compared to the original solution.

Frederic Thevenet has updated the pull request incrementally with two additional commits since the last revision:

 - Mark variables as final
 - Using for loops instead of while

-------------

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/112/files
  - new: https://git.openjdk.java.net/jfx/pull/112/files/d8083075..58cc2000

Webrevs:
 - full: https://webrevs.openjdk.java.net/jfx/112/webrev.15
 - incr: https://webrevs.openjdk.java.net/jfx/112/webrev.14-15

  Stats: 37 lines in 1 file changed: 3 ins; 14 del; 20 mod
  Patch: https://git.openjdk.java.net/jfx/pull/112.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/112/head:pull/112

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