On Tue, 29 Jun 2021 17:34:00 GMT, Jayathirth D V <j...@openjdk.org> wrote:
> Final blit operation in MTLLayer.blitTexture() is driven by CVDisplayLink in
> Metal.
> In this test case we are hitting an invalid condition because of which we
> exit from MTLLayer.blitTexture(), but we are not stopping the CVDisplayLink.
> This is causing the CVDisplayLink callback to run in loop. Fix is to stop
> CVDisplayLink when we return without completing final blit operation in
> MTLLayer.blitTexture().
>
> Sanity and performance analysis is green. More details in JBS.
I tested this patch with applications such as SwingSet2 and NetBeans IDE with
graphics card switching. Also, tested multi-monitor scenarios. No regression
observed.
src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLLayer.m line 88:
> 86:
> 87: if (self.nextDrawableCount != 0) {
> 88: [self stopDisplayLink];
Please check invoking stopDisplayLink at this place. If a Drawable is not
available, we should return from here but recheck after 16ms. A drawable might
be made available on subsequent attempts.
Stopping DisplayLink at other invalid cases makes sense.
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PR: https://git.openjdk.java.net/jdk17/pull/175
