mirror of
https://github.com/torvalds/linux.git
synced 2024-12-12 22:23:55 +00:00
c2b66cafdf
Shorten the tables by removing row numbers in comments, allowing for
later insertion of rows with minimal diffs.
All changes have been generated by the following script.
import io
import re
import sys
def process_table(fname, data):
if fname.endswith('hist-v4l2.rst'):
data = re.sub(u'\n{1,2}\t( ?) -( ?) ?', u'\n\t\\1 -\\2', data, flags = re.MULTILINE)
data = re.sub(u'\n(\t| )- \.\. row [0-9]+\n\t ?-( ?) ?', u'\\1* -\\2', data, flags = re.MULTILINE)
else:
data = re.sub(u'\n{1,2} -( ?) ?', u'\n -\\1', data, flags = re.MULTILINE)
data = re.sub(u'(\n?)(\n\n - \.\. row 1\n)', u'\n\\2', data, flags = re.MULTILINE)
data = re.sub(u'\n - \.\. row [0-9]+\n -( ?) ?', u' * -\\1', data, flags = re.MULTILINE)
data = re.sub(u'\n - \.\. row [0-9]+\n \.\. (_[A-Z0-9_`-]*:)', u'\n - .. \\1', data, flags = re.MULTILINE)
data = re.sub(u'\n - \.\. (_[A-Z0-9_`-]*:)\n -', u' * .. \\1\n\n -', data, flags = re.MULTILINE)
data = re.sub(u'^ - ', u' -', data, flags = re.MULTILINE)
data = re.sub(u'^(\t{1,2}) ', u'\\1', data, flags = re.MULTILINE)
return data
def process_file(fname, data):
buf = io.StringIO(data)
output = ''
in_table = False
table_separator = 0
for line in buf.readlines():
if line.find('.. flat-table::') != -1:
in_table = True
table = ''
elif in_table and not re.match('^[\t\n]|( )', line):
in_table = False
output += process_table(fname, table)
if in_table:
table += line
else:
output += line
if in_table:
in_table = False
output += process_table(fname, table)
return output
fname = sys.argv[1]
data = file(fname, 'rb').read().decode('utf-8')
data = process_file(fname, data)
file(fname, 'wb').write(data.encode('utf-8'))
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
108 lines
3.4 KiB
ReStructuredText
108 lines
3.4 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
|
|
|
|
.. _VIDIOC_G_CROP:
|
|
|
|
**********************************
|
|
ioctl VIDIOC_G_CROP, VIDIOC_S_CROP
|
|
**********************************
|
|
|
|
Name
|
|
====
|
|
|
|
VIDIOC_G_CROP - VIDIOC_S_CROP - Get or set the current cropping rectangle
|
|
|
|
|
|
Synopsis
|
|
========
|
|
|
|
.. c:function:: int ioctl( int fd, VIDIOC_G_CROP, struct v4l2_crop *argp )
|
|
:name: VIDIOC_G_CROP
|
|
|
|
.. c:function:: int ioctl( int fd, VIDIOC_S_CROP, const struct v4l2_crop *argp )
|
|
:name: VIDIOC_S_CROP
|
|
|
|
|
|
Arguments
|
|
=========
|
|
|
|
``fd``
|
|
File descriptor returned by :ref:`open() <func-open>`.
|
|
|
|
``argp``
|
|
|
|
|
|
Description
|
|
===========
|
|
|
|
To query the cropping rectangle size and position applications set the
|
|
``type`` field of a struct :c:type:`v4l2_crop` structure to the
|
|
respective buffer (stream) type and call the :ref:`VIDIOC_G_CROP <VIDIOC_G_CROP>` ioctl
|
|
with a pointer to this structure. The driver fills the rest of the
|
|
structure or returns the ``EINVAL`` error code if cropping is not supported.
|
|
|
|
To change the cropping rectangle applications initialize the ``type``
|
|
and struct :c:type:`v4l2_rect` substructure named ``c`` of a
|
|
v4l2_crop structure and call the :ref:`VIDIOC_S_CROP <VIDIOC_G_CROP>` ioctl with a pointer
|
|
to this structure.
|
|
|
|
Do not use the multiplanar buffer types. Use
|
|
``V4L2_BUF_TYPE_VIDEO_CAPTURE`` instead of
|
|
``V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE`` and use
|
|
``V4L2_BUF_TYPE_VIDEO_OUTPUT`` instead of
|
|
``V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE``.
|
|
|
|
The driver first adjusts the requested dimensions against hardware
|
|
limits, i. e. the bounds given by the capture/output window, and it
|
|
rounds to the closest possible values of horizontal and vertical offset,
|
|
width and height. In particular the driver must round the vertical
|
|
offset of the cropping rectangle to frame lines modulo two, such that
|
|
the field order cannot be confused.
|
|
|
|
Second the driver adjusts the image size (the opposite rectangle of the
|
|
scaling process, source or target depending on the data direction) to
|
|
the closest size possible while maintaining the current horizontal and
|
|
vertical scaling factor.
|
|
|
|
Finally the driver programs the hardware with the actual cropping and
|
|
image parameters. :ref:`VIDIOC_S_CROP <VIDIOC_G_CROP>` is a write-only ioctl, it does not
|
|
return the actual parameters. To query them applications must call
|
|
:ref:`VIDIOC_G_CROP <VIDIOC_G_CROP>` and :ref:`VIDIOC_G_FMT`. When the
|
|
parameters are unsuitable the application may modify the cropping or
|
|
image parameters and repeat the cycle until satisfactory parameters have
|
|
been negotiated.
|
|
|
|
When cropping is not supported then no parameters are changed and
|
|
:ref:`VIDIOC_S_CROP <VIDIOC_G_CROP>` returns the ``EINVAL`` error code.
|
|
|
|
|
|
.. c:type:: v4l2_crop
|
|
|
|
.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
|
|
|
|
.. flat-table:: struct v4l2_crop
|
|
:header-rows: 0
|
|
:stub-columns: 0
|
|
:widths: 1 1 2
|
|
|
|
* - __u32
|
|
- ``type``
|
|
- Type of the data stream, set by the application. Only these types
|
|
are valid here: ``V4L2_BUF_TYPE_VIDEO_CAPTURE``,
|
|
``V4L2_BUF_TYPE_VIDEO_OUTPUT`` and
|
|
``V4L2_BUF_TYPE_VIDEO_OVERLAY``. See :c:type:`v4l2_buf_type`.
|
|
* - struct :c:type:`v4l2_rect`
|
|
- ``c``
|
|
- Cropping rectangle. The same co-ordinate system as for struct
|
|
:c:type:`v4l2_cropcap` ``bounds`` is used.
|
|
|
|
|
|
Return Value
|
|
============
|
|
|
|
On success 0 is returned, on error -1 and the ``errno`` variable is set
|
|
appropriately. The generic error codes are described at the
|
|
:ref:`Generic Error Codes <gen-errors>` chapter.
|
|
|
|
ENODATA
|
|
Cropping is not supported for this input or output.
|