[Rev 04] RFR: 8238954: Improve performance of tiled snapshot rendering

[Frederic Thevenet]

On Sat, 9 May 2020 17:43:08 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> [...] I'd like to see some additional system tests that cover all of the cases of X and Y fitting/not-fitting exactly
> (and if you stick with your current approach, X or Y as the inner loop).

What kind of tests do you have in mind? More specifically do you mean simply adding tests that expand on the existing
`doTestSnapshotScaleNodeDefer`and `doTestSnapshotScaleNodeImm` (which basically just prove that taking a snapshot
returns a non-null image of the expected size)? Or do you think we need to include a test that proves the snapshot
produced by tiling is entirely faithful to the original, pixel-wise?

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