macOS: Correctly scale CALayer contentsRect for child NSViews

When flushing parts of a QBackingStore onto child QWindows, and we're
in layer-backed mode, we need to set the contentsRect of the layer
so that the layer will only show the part of the top-level-owned
backingstore image that's relevant for the child window.

Since the contentsRect is in unit coordinate system, we need to apply
a transform, but this must be based on the top level view's size, not
the image size, as the latter will be twice as big on a retina screen,
giving the wrong unit rect.

Change-Id: I7d6f378ed46a98272efb13406a2878ec1efe734e
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

0 files changed, 0 insertions, 0 deletions