Fixed upside-down camera image on Linux - #628
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Summary
CameraSurface::onVideoFrameChanged()kept a Linux-only transform (horizontal mirror + 180° rotation, net a vertical flip) inherited from a pre-Qt6 OpenGL orientation workaround. The exact same transform was already identified and removed on macOS in f1e51b4 ("Fix upside-down camera image on macOS") — Qt 6'sQVideoFrame/QVideoSinkdeliver upright, top-left-origin frames on every platform (same convention the video-file path already relies on unmodified), so the flip only made the image upside-down. That commit left Linux's branch untouched out of caution, with a comment inviting a follow-up ("adjust if cameras look flipped").Removed the now-platform-wide special case; all platforms use the frame as-is.
Test plan
qmake6 mapmap.pro && makebuilds cleantests/suite builds and all tests passCameraSurface::onVideoFrameChanged()in a standalone harness and fed it a synthetic top-red/bottom-blueQVideoFramedirectly viaQVideoSink::setVideoFrame()(bypassing camera hardware/libcamera entirely, which doesn't enumerate the v4l2loopback device available in this environment). Before the fix: red/blue came out swapped (upside down). After the fix: correct orientation.