libcamera: include/libcamera/internal/mapped_framebuffer.h Source File

libcamera v0.1.0 Supporting cameras in Linux since 2019

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mapped_framebuffer.h
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1/* SPDX-License-Identifier: LGPL-2.1-or-later */
2/*
3 * Copyright (C) 2021, Google Inc.
4 *
5 * mapped_framebuffer.h - Frame buffer memory mapping support
6 */
7
8#pragma once
9
10#include <stdint.h>
11#include <vector>
12
13#include <libcamera/base/class.h>
14#include <libcamera/base/flags.h>
15#include <libcamera/base/span.h>
16
17#include <libcamera/framebuffer.h>
18
19namespace libcamera {
20
21 class MappedBuffer
22{
23public:
24 using Plane = Span<uint8_t>;
25
26 ~MappedBuffer();
27
28 MappedBuffer(MappedBuffer &&other);
29 MappedBuffer &operator=(MappedBuffer &&other);
30
31 bool isValid() const { return error_ == 0; }
32 int error() const { return error_; }
33 const std::vector<Plane> &planes() const { return planes_; }
34
35protected:
36 MappedBuffer();
37
38 int error_;
39 std::vector<Plane> planes_;
40 std::vector<Plane> maps_;
41
42private:
43 LIBCAMERA_DISABLE_COPY(MappedBuffer)
44};
45
46 class MappedFrameBuffer : public MappedBuffer
47{
48public:
49 enum class MapFlag {
50 Read = 1 << 0,
51 Write = 1 << 1,
52 ReadWrite = Read | Write,
53 };
54
55 using MapFlags = Flags<MapFlag>;
56
57 MappedFrameBuffer(const FrameBuffer *buffer, MapFlags flags);
58};
59
60 LIBCAMERA_FLAGS_ENABLE_OPERATORS(MappedFrameBuffer::MapFlag)
61
62} /* namespace libcamera */
class.h
Utilities to help constructing class interfaces.
LIBCAMERA_DISABLE_COPY
#define LIBCAMERA_DISABLE_COPY(klass)
Disable copy construction and assignment of the klass.
Definition class.h:27
libcamera::Flags
Type-safe container for enum-based bitfields.
Definition flags.h:16
libcamera::FrameBuffer
Frame buffer data and its associated dynamic metadata.
Definition framebuffer.h:50
libcamera::MappedBuffer
Provide an interface to support managing memory mapped buffers.
Definition mapped_framebuffer.h:22
libcamera::MappedBuffer::MappedBuffer
MappedBuffer()
Construct an empty MappedBuffer.
Definition mapped_framebuffer.cpp:53
libcamera::MappedBuffer::planes
const std::vector< Plane > & planes() const
Retrieve the mapped planes.
Definition mapped_framebuffer.h:33
libcamera::MappedBuffer::maps_
std::vector< Plane > maps_
Stores the mapped buffer.
Definition mapped_framebuffer.h:40
libcamera::MappedBuffer::Plane
Span< uint8_t > Plane
A mapped region of memory accessible to the CPU.
Definition mapped_framebuffer.h:24
libcamera::MappedBuffer::error
int error() const
Retrieve the map error status.
Definition mapped_framebuffer.h:32
libcamera::MappedBuffer::operator=
MappedBuffer & operator=(MappedBuffer &&other)
Move assignment operator, replace the mappings with those of other.
Definition mapped_framebuffer.cpp:82
libcamera::MappedBuffer::error_
int error_
Stores the error value if present.
Definition mapped_framebuffer.h:38
libcamera::MappedBuffer::isValid
bool isValid() const
Check if the MappedBuffer instance is valid.
Definition mapped_framebuffer.h:31
libcamera::MappedBuffer::planes_
std::vector< Plane > planes_
Stores the internal mapped planes.
Definition mapped_framebuffer.h:39
libcamera::MappedFrameBuffer
Map a FrameBuffer using the MappedBuffer interface.
Definition mapped_framebuffer.h:47
libcamera::MappedFrameBuffer::MapFlag
MapFlag
Specify the mapping mode for the FrameBuffer.
Definition mapped_framebuffer.h:49
libcamera::MappedFrameBuffer::MapFlag::Write
@ Write
Create a write-only mapping.
libcamera::MappedFrameBuffer::MapFlag::ReadWrite
@ ReadWrite
Create a mapping that can be both read and written.
libcamera::MappedFrameBuffer::MapFlag::Read
@ Read
Create a read-only mapping.
flags.h
Enum-based bit fields.
LIBCAMERA_FLAGS_ENABLE_OPERATORS
#define LIBCAMERA_FLAGS_ENABLE_OPERATORS(_enum)
Enable bitwise operations on the enum enumeration.
Definition flags.h:189
framebuffer.h
Frame buffer handling.
libcamera
Top-level libcamera namespace.
Definition backtrace.h:17