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.. -*- 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
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