diff options
Diffstat (limited to 'src/libcamera')
| -rw-r--r-- | src/libcamera/mapped_framebuffer.cpp | 34 |
1 files changed, 29 insertions, 5 deletions
diff --git a/src/libcamera/mapped_framebuffer.cpp b/src/libcamera/mapped_framebuffer.cpp index 4ace400c..4ac45083 100644 --- a/src/libcamera/mapped_framebuffer.cpp +++ b/src/libcamera/mapped_framebuffer.cpp @@ -141,20 +141,44 @@ MappedBuffer::~MappedBuffer() */ /** + * \enum MappedFrameBuffer::MapFlag + * \brief Specify the mapping mode for the FrameBuffer + * \var MappedFrameBuffer::Read + * \brief Create a read-only mapping + * \var MappedFrameBuffer::Write + * \brief Create a write-only mapping + * \var MappedFrameBuffer::ReadWrite + * \brief Create a mapping that can be both read and written + */ + +/** + * \typedef MappedFrameBuffer::MapFlags + * \brief A bitwise combination of MappedFrameBuffer::MapFlag values + */ + +/** * \brief Map all planes of a FrameBuffer * \param[in] buffer FrameBuffer to be mapped * \param[in] flags Protection flags to apply to map * - * Construct an object to map a frame buffer for CPU access. - * The flags are passed directly to mmap and should be either PROT_READ, - * PROT_WRITE, or a bitwise-or combination of both. + * Construct an object to map a frame buffer for CPU access. The mapping can be + * made as Read only, Write only or support Read and Write operations by setting + * the MapFlag flags accordingly. */ -MappedFrameBuffer::MappedFrameBuffer(const FrameBuffer *buffer, int flags) +MappedFrameBuffer::MappedFrameBuffer(const FrameBuffer *buffer, MapFlags flags) { maps_.reserve(buffer->planes().size()); + int mmapFlags = 0; + + if (flags & MapFlag::Read) + mmapFlags |= PROT_READ; + + if (flags & MapFlag::Write) + mmapFlags |= PROT_WRITE; + for (const FrameBuffer::Plane &plane : buffer->planes()) { - void *address = mmap(nullptr, plane.length, flags, + void *address = mmap(nullptr, plane.length, mmapFlags, MAP_SHARED, plane.fd.fd(), 0); if (address == MAP_FAILED) { error_ = -errno; |