[Webkit-unassigned] [Bug 201895] New: [cairo] Incorrect targetRect in BackingStoreBackendCairoImpl::scroll

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201895

            Bug ID: 201895
           Summary: [cairo] Incorrect targetRect in
                    BackingStoreBackendCairoImpl::scroll
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Platform
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Hironori.Fujii at sony.com
                CC: cgarcia at igalia.com, magomez at igalia.com,
                    mrobinson at webkit.org, zan at falconsigh.net

[cairo] Incorrect targetRect in BackingStoreBackendCairoImpl::scroll

In BackingStoreBackendCairoImpl::scroll, targetRect is calculated wrongly by shifting maxX and manxY.

>    IntRect targetRect = scrollRect;
>    targetRect.move(scrollOffset);
>    targetRect.shiftMaxXEdgeTo(targetRect.maxX() - scrollOffset.width());
>    targetRect.shiftMaxYEdgeTo(targetRect.maxY() - scrollOffset.height());

This code came from Bug 59655.

On the other hand, Bug 83309 fixed BackingStoreBackendCairoX11::scroll.

>    IntRect targetRect = scrollRect;
>    targetRect.move(scrollOffset);
>    targetRect.intersect(scrollRect);

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