[chromium] composited layers are not invalidated correctly with a zoom-in page scale factor

[Grace Kloba]

This is the side effect of https://bugs.webkit.org/show_bug.cgi?id=71225. When page scale factor is greater than one, the invalidation area is not scale correctly. This caused some area are not updated correct when it needs.

[Grace Kloba]

Created attachment 117074 [details]
Patch

[James Robinson]

Comment on attachment 117074 [details]
Patch

Need a test!

[Dana Jansens]

Comment on attachment 117074 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=117074&action=review

> Source/WebCore/platform/graphics/chromium/GraphicsLayerChromium.cpp:684
> -        return pageScaleFactor() * deviceScaleFactor();
> +        return pageScaleFactor();

This is going to break ChromeOS, where pageScaleFactor is 1 but deviceScaleFactor is not (see NonCompositedContentHost.h)

[Dana Jansens]

Comment on attachment 117074 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=117074&action=review

>> Source/WebCore/platform/graphics/chromium/GraphicsLayerChromium.cpp:684
>> +        return pageScaleFactor();
> 
> This is going to break ChromeOS, where pageScaleFactor is 1 but deviceScaleFactor is not (see NonCompositedContentHost.h)

Also, note that deviceScaleFactor() would be 1 on non-ChromeOS already (see WebViewImpl.cpp:3685)

[Sami Kyöstilä]

I wonder if this is related: https://bugs.webkit.org/show_bug.cgi?id=88762

[Adam Barth]

This patch appears to no longer be needed.