Bug 128509 – Subpixel rendering: Enable compositing RenderLayer painting on device pixel position.

• Status: RESOLVED
• Resolution: FIXED
• Component: Layout and Rendering

[zalan]

SSIA

[zalan]

Created attachment 223662 [details]
patch

[Simon Fraser (smfr)]

Comment on attachment 223662 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=223662&action=review

> Source/WebCore/platform/graphics/ca/GraphicsLayerCA.cpp:2041
> +        contentOrigin = IntPoint(m_contentsRect.location() - m_contentsClippingRect.location());

Is this always integral?

> Source/WebCore/rendering/RenderLayerBacking.cpp:1228
> -    IntSize offsetFromRenderer = m_graphicsLayer->offsetFromRenderer();
> +    IntSize offsetFromRenderer = roundedIntSize(m_graphicsLayer->offsetFromRenderer());

Hm, not sure that this is right.

[zalan]

(In reply to comment #2)
> (From update of attachment 223662 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=223662&action=review
> 
> > Source/WebCore/platform/graphics/ca/GraphicsLayerCA.cpp:2041
> > +        contentOrigin = IntPoint(m_contentsRect.location() - m_contentsClippingRect.location());
> 
> Is this always integral?
> 
> > Source/WebCore/rendering/RenderLayerBacking.cpp:1228
> > -    IntSize offsetFromRenderer = m_graphicsLayer->offsetFromRenderer();
> > +    IntSize offsetFromRenderer = roundedIntSize(m_graphicsLayer->offsetFromRenderer());
> 
> Hm, not sure that this is right.

No it's not right, but scrolling layers, overflowcontrols + alikes need another pass and at this point I am just sticking with the existing behavior for them (snapping to integral position). I should have mentioned it in the changelog entry.

[zalan]

Created attachment 224588 [details]
Patch

for pre-review. (test cases and rebaselining is coming)

[zalan]

Created attachment 224655 [details]
Patch

[zalan]

Created attachment 224712 [details]
Patch

[Build Bot]

Comment on attachment 224712 [details]
Patch

Attachment 224712 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.appspot.com/results/6356815939895296

New failing tests:
fast/multicol/newmulticol/clipping.html

[Build Bot]

Created attachment 224719 [details]
Archive of layout-test-results from webkit-ews-16 for mac-mountainlion-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: webkit-ews-16  Port: mac-mountainlion-wk2  Platform: Mac OS X 10.8.5

[Build Bot]

Comment on attachment 224712 [details]
Patch

Attachment 224712 [details] did not pass mac-ews (mac):
Output: http://webkit-queues.appspot.com/results/5365914639794176

New failing tests:
fast/multicol/newmulticol/clipping.html

[Build Bot]

Created attachment 224725 [details]
Archive of layout-test-results from webkit-ews-01 for mac-mountainlion

The attached test failures were seen while running run-webkit-tests on the mac-ews.
Bot: webkit-ews-01  Port: mac-mountainlion  Platform: Mac OS X 10.8.5

[Build Bot]

Comment on attachment 224712 [details]
Patch

Attachment 224712 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.appspot.com/results/6427184684072960

New failing tests:
fast/multicol/newmulticol/clipping.html

[Build Bot]

Created attachment 224726 [details]
Archive of layout-test-results from webkit-ews-12 for mac-mountainlion-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: webkit-ews-12  Port: mac-mountainlion-wk2  Platform: Mac OS X 10.8.5

[Build Bot]

Comment on attachment 224712 [details]
Patch

Attachment 224712 [details] did not pass mac-ews (mac):
Output: http://webkit-queues.appspot.com/results/5796276536868864

New failing tests:
fast/multicol/newmulticol/clipping.html

[Build Bot]

Created attachment 224728 [details]
Archive of layout-test-results from webkit-ews-04 for mac-mountainlion

The attached test failures were seen while running run-webkit-tests on the mac-ews.
Bot: webkit-ews-04  Port: mac-mountainlion  Platform: Mac OS X 10.8.5

[zalan]

(In reply to comment #11)
> (From update of attachment 224712 [details])
> Attachment 224712 [details] did not pass mac-wk2-ews (mac-wk2):
> Output: http://webkit-queues.appspot.com/results/6427184684072960
> 
> New failing tests:
> fast/multicol/newmulticol/clipping.html

oh, this one! I hoped it was just something wrong with my local env. :)

[zalan]

(In reply to comment #15)
> (In reply to comment #11)
> > (From update of attachment 224712 [details] [details])
> > Attachment 224712 [details] [details] did not pass mac-wk2-ews (mac-wk2):
> > Output: http://webkit-queues.appspot.com/results/6427184684072960
> > 
> > New failing tests:
> > fast/multicol/newmulticol/clipping.html
> 
> oh, this one! I hoped it was just something wrong with my local env. :)
non-retina only.

[zalan]

Created attachment 224783 [details]
Patch

[zalan]

Comment on attachment 224783 [details]
Patch

EWS testing.

[zalan]

Created attachment 224788 [details]
Patch

[zalan]

Comment on attachment 224788 [details]
Patch

EWS

[WebKit Commit Bot]

Comment on attachment 224788 [details]
Patch

Clearing flags on attachment: 224788

Committed r164449: <http://trac.webkit.org/changeset/164449>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[Ryosuke Niwa]

Looks like this patch regressed fast/multicol/newmulticol/clipping.html ?
e.g. http://build.webkit.org/results/Apple%20MountainLion%20Release%20WK2%20(Tests)/r164471%20(16180)/results.html

http://webkit-test-results.appspot.com/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fmulticol%2Fnewmulticol%2Fclipping.html