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drm_hwcomposer: Fix bitmask property mask creation

Drew Davenport requested to merge ddavenport/drm-hwcomposer:gitlab-bitmask-property into main

Enum properties may have the flag DRM_MODE_PROP_BITMASK to indicate that the enum values should be interpreted as bitshifts.

  • Add a function DrmProperty::IsBitmask to check if this flag is set
  • Check that this flag is set in DrmProperty::GetEnumMask
  • Fix GetEnumMask to interpret the enum value as a bitshift

Fixes: da2fcf66 ("drm_hwcomposer: Simplify LayerTransform") Change-Id: Ice50ac23344f508b6dee761a51879da99d848007 Signed-off-by: Drew Davenport ddavenport@google.com

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