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Add selftests for drm_rect. A few basic ones for clipped and unclipped cases, and a few special ones for specific bugs we had in the code. I'm too lazy to think of more corner cases to check at this time. Maybe later. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191122175623.13565-5-ville.syrjala@linux.intel.com Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Benjamin Gaignard <benjamin.gaignard@st.com>