libcamera/vivid.git - libcamera pipeline handler for VIVID

path: root/LICENSES/GPL-2.0-or-later.txt

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author	Hirokazu Honda <hiroh@chromium.org>	2021-08-26 20:25:36 +0900
committer	Laurent Pinchart <laurent.pinchart@ideasonboard.com>	2021-08-30 18:08:02 +0300
commit	e5e7cdf701797463edcbe1f4b26dcc31b32d891d (patch)
tree	6e6f75f450c2774b62c93c2084d1338b698e5e7c /LICENSES/GPL-2.0-or-later.txt
parent	1d2263dd3d7dc68d8d1920682952e17d0a22ed95 (diff)

gstreamer: gstlibcameraallocator: Use offset in creating a buffer

The plane length is the length of the plane size. The buffer length to be allocated for a plane is the offset and the length of FrameBuffer::Plane. Signed-off-by: Hirokazu Honda <hiroh@chromium.org> Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Diffstat (limited to 'LICENSES/GPL-2.0-or-later.txt')

0 files changed, 0 insertions, 0 deletions

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2020, Raspberry Pi (Trading) Limited
 *
 * transform.cpp - 2D plane transforms.
 */

#include <libcamera/transform.h>

/**
 * \file transform.h
 * \brief Enum to represent and manipulate 2D plane transforms
 */

namespace libcamera {

/**
 * \enum Transform
 * \brief Enum to represent a 2D plane transform
 *
 * The Transform can take 8 distinct values, representing the usual 2D plane
 * transforms listed below. Each of these transforms can be constructed
 * out of 3 basic operations, namely a horizontal flip (mirror), a vertical
 * flip, and a transposition (about the main diagonal). The transforms are
 * encoded such that a single bit indicates the presence of each of the 3
 * basic operations:
 *
 * - bit 0 - presence of a horizontal flip
 * - bit 1 - presence of a vertical flip
 * - bit 2 - presence of a transposition.
 *
 * We regard these 3 basic operations as being applied in a specific order:
 * first the two flip operations (actually they commute, so the order between
 * them is unimportant) and finally any transpose operation.
 *
 * Functions are provided to manipulate directly the bits within the transform
 * encoding, but there are also higher-level functions to invert and compose
 * transforms. Transforms are composed according to the usual mathematical
 * convention such that the right transform is applied first, and the left
 * transform is applied second.
 *
 * Finally, we have a total of 8 distinct transformations, as follows (a
 * couple of them have additional synonyms for convenience). We illustrate each
 * with its nominal effect on a rectangle with vertices labelled A, B, C and D.
 *
 * **Identity**
 *
 * Identity transform.
~~~
              A-B                          A-B
Input image   | |   goes to output image   | |
              C-D                          C-D
~~~
 * Numeric value: 0 (no bits set).
 *
 * **Rot0**
 *
 * Synonym for `Identity` (zero degree rotation).
 *
 * **HFlip**
 *
 * Horizontal flip.
~~~
              A-B                          B-A
Input image   | |   goes to output image   | |
              C-D                          D-C
~~~
 * Numeric value: 1 (horizontal flip bit set only).
 *
 * **VFlip**
 *
 * Vertical flip.
~~~
              A-B                          C-D
Input image   | |   goes to output image   | |
              C-D                          A-B
~~~
 * Numeric value: 2 (vertical flip bit set only).
 *
 * **HVFlip**
 *
 * Horizontal and vertical flip (identical to a 180 degree rotation).
~~~
              A-B                          D-C
Input image   | |   goes to output image   | |
              C-D                          B-A
~~~
 * Numeric value: 3 (horizontal and vertical flip bits set).
 *
 * **Rot180**
 *
 * Synonym for `HVFlip` (180 degree rotation).
 *
 * **Transpose**
 *
 * Transpose (about the main diagonal).
~~~
              A-B                          A-C
Input image   | |   goes to output image   | |
              C-D                          B-D
~~~
 * Numeric value: 4 (transpose bit set only).
 *
 * **Rot270**
 *
 * Rotation by 270 degrees clockwise (90 degrees anticlockwise).
~~~
              A-B                          B-D
Input image   | |   goes to output image   | |
              C-D                          A-C
~~~
 * Numeric value: 5 (transpose and horizontal flip bits set).
 *
 * **Rot90**
 *
 * Rotation by 90 degrees clockwise (270 degrees anticlockwise).
~~~
              A-B                          C-A
Input image   | |   goes to output image   | |
              C-D                          D-B
~~~
 * Numeric value: 6 (transpose and vertical flip bits set).
 *
 * **Rot180Transpose**
 *


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