• A method of obtaining view tree snapshots for a particular view, the “context view”, and its child views, if any. The returned data is a sequence of snapshots during the period of observation, which starts at the client’s prior Watch() call’s [epoch_end] (or zx.Time 0), and ending at the current [epoch_end]. The timebase is ZX_CLOCK_MONOTONIC.


  • The maximum number of ViewTreeSnapshots a client can expect in a Watch call’s response. The number of ViewTreeSnapshots can be less than BUFFER_SIZE when the size of a Watch call’s response exceeds the limit of a FIDL channel.
  • The maximum number of ViewDescriptors a client can expect in a ViewTreeSnapshot.


Type Aliases

  • The ratio from physical pixels (of a display) to logical pixels (of the coordinate system of a view).