FYI: 8243508: Update alpha blending and compositing functions

[Kevin Rushforth]

On Mon, 27 Apr 2020 22:21:06 GMT, Alexey Ushakov <avu at openjdk.org> wrote:

> Corrected FLT_LT and FLT_GE macro
> Fixed test/jdk/java/awt/image/DrawImage/IncorrectUnmanagedImageRotatedClip.java failure caused by fix of 8243505

src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLComposite.m line 154:

> 153:     }
> 154:     return isSrcOpaque;
> 155: }

Thanks for fixing this. Btw, I think this still needs to be looked at. Unless there is a case I haven't thought of,
both of `extraAlphaIsOne` and `isSrcOpaque` should be used, or else neither of them should.

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PR: https://git.openjdk.java.net/lanai/pull/40