diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/libcamera/framebuffer.cpp | 45 |
1 files changed, 43 insertions, 2 deletions
diff --git a/src/libcamera/framebuffer.cpp b/src/libcamera/framebuffer.cpp index ad63a34a..e71c2ffa 100644 --- a/src/libcamera/framebuffer.cpp +++ b/src/libcamera/framebuffer.cpp @@ -106,7 +106,7 @@ LOG_DEFINE_CATEGORY(Buffer) */ FrameBuffer::Private::Private() - : request_(nullptr) + : request_(nullptr), isContiguous_(true) { } @@ -121,6 +121,17 @@ FrameBuffer::Private::Private() */ /** + * \fn FrameBuffer::Private::isContiguous() + * \brief Check if the frame buffer stores planes contiguously in memory + * + * Multi-planar frame buffers can store their planes contiguously in memory, or + * split them into discontiguous memory areas. This function checks in which of + * these two categories the frame buffer belongs. + * + * \return True if the planes are stored contiguously in memory, false otherwise + */ + +/** * \class FrameBuffer * \brief Frame buffer data and its associated dynamic metadata * @@ -199,8 +210,38 @@ FrameBuffer::FrameBuffer(const std::vector<Plane> &planes, unsigned int cookie) : Extensible(std::make_unique<Private>()), planes_(planes), cookie_(cookie) { - for (const auto &plane : planes_) + unsigned int offset = 0; + bool isContiguous = true; + ino_t inode = 0; + + for (const auto &plane : planes_) { ASSERT(plane.offset != Plane::kInvalidOffset); + + if (plane.offset != offset) { + isContiguous = false; + break; + } + + /* + * Two different dmabuf file descriptors may still refer to the + * same dmabuf instance. Check this using inodes. + */ + if (plane.fd.fd() != planes_[0].fd.fd()) { + if (!inode) + inode = planes_[0].fd.inode(); + if (plane.fd.inode() != inode) { + isContiguous = false; + break; + } + } + + offset += plane.length; + } + + LOG(Buffer, Debug) + << "Buffer is " << (isContiguous ? "not " : "") << "contiguous"; + + _d()->isContiguous_ = isContiguous; } /** |