QRasterPlatformPixmap::systemOpaqueFormat returned QPlatformScreen::format
without checking that the format was actually opaque.
This caused several QPixmap tests to fail on Wayland because Wayland
compositors don't communicate the native format of the screen, just a list of
supported pixel formats, so we just return ARGB32_premultiplied in
QWaylandScreen::format().
Rename the method systemOpaqueFormat to systemNativeFormat since that's how
it's used most of the time. And do a conversion when we actually care whether
the format is opaque or not.
Task-number: QTBUG-51748
Change-Id: I47dc1c3f185fb802016ca361206d47d02e8d3cf1
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
efa6e98912