.. -*- coding: utf-8; mode: rst -*-

.. _v4l2-selection-targets:

*****************
Selection targets
*****************

The precise meaning of the selection targets may be dependent on which
of the two interfaces they are used.


.. _v4l2-selection-targets-table:

.. tabularcolumns:: |p{5.8cm}|p{1.4cm}|p{6.5cm}|p{1.2cm}|p{1.6cm}|

.. flat-table:: Selection target definitions
    :header-rows:  1
    :stub-columns: 0

    * - Target name
      - id
      - Definition
      - Valid for V4L2
      - Valid for V4L2 subdev
    * - ``V4L2_SEL_TGT_CROP``
      - 0x0000
      - Crop rectangle. Defines the cropped area.
      - Yes
      - Yes
    * - ``V4L2_SEL_TGT_CROP_DEFAULT``
      - 0x0001
      - Suggested cropping rectangle that covers the "whole picture".
      - Yes
      - No
    * - ``V4L2_SEL_TGT_CROP_BOUNDS``
      - 0x0002
      - Bounds of the crop rectangle. All valid crop rectangles fit inside
	the crop bounds rectangle.
      - Yes
      - Yes
    * - ``V4L2_SEL_TGT_NATIVE_SIZE``
      - 0x0003
      - The native size of the device, e.g. a sensor's pixel array.
	``left`` and ``top`` fields are zero for this target. Setting the
	native size will generally only make sense for memory to memory
	devices where the software can create a canvas of a given size in
	which for example a video frame can be composed. In that case
	V4L2_SEL_TGT_NATIVE_SIZE can be used to configure the size of
	that canvas.
      - Yes
      - Yes
    * - ``V4L2_SEL_TGT_COMPOSE``
      - 0x0100
      - Compose rectangle. Used to configure scaling and composition.
      - Yes
      - Yes
    * - ``V4L2_SEL_TGT_COMPOSE_DEFAULT``
      - 0x0101
      - Suggested composition rectangle that covers the "whole picture".
      - Yes
      - No
    * - ``V4L2_SEL_TGT_COMPOSE_BOUNDS``
      - 0x0102
      - Bounds of the compose rectangle. All valid compose rectangles fit
	inside the compose bounds rectangle.
      - Yes
      - Yes
    * - ``V4L2_SEL_TGT_COMPOSE_PADDED``
      - 0x0103
      - The active area and all padding pixels that are inserted or
	modified by hardware.
      - Yes
      - No