tree f68d8c994f38752638c2d2dfbeac20b5460e28fd
parent 156bfb4c4b13be95b8ea0c260eb7160061a6f4d9
author Nathan Hebert <nhebert@chromium.org> 1710434553 +0000
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1710434553 +0000

media/gpu/chromeos: Add NativePixmapFrameResource

NativePixmapFrameResource is composed of a NativePixmapDmaBuf and
VideoFrame metadata members. It presents a VideoFrame::StorageType of
STORAGE_DMABUF and provides file descriptor accessors.

It can be constructed by assuming ownership over a vector of per-plane
file descriptors (which will be used to import V4L2 buffers), by
allocating the planes using MiniGBM, or by assuming ownership of a
NativePixmapDmaBuf.

The method WrapFrame is used to create a new FrameResource that is
backed by the same NativePixmapDmaBuf, but with caller specified visible
rectangle, and a copy of the VideoFrame metadata, which can be modified.

The conversion method CreateVideoFrame() produces a VideoFrame with a
storage type of STORAGE_GPU_MEMORY_BUFFER with duplicated file
descriptors.

There are two changes to functions in platform_video_frame_utils.h to
expose functionality that is needed by the implementation of
NativePixmapFrameResource:

1. AllocateGpuMemoryBufferHandle() creates a NativePixmap and returns a
GpuMemoryBufferHandle that refers to it. It does so by utilizing a GBM
wrapper that is scoped just to platform_video_frame_utils.cc. In order
for NativePixmapFrameResource to have a Create function that uses
MiniGBM to allocate frames, the function has been moved out of an
anoynmous namespace and is now declared in platform_frame_utils.h.

2. CreateGpuMemoryBufferVideoFrame() allocates a GMBHandle and creates a
VideoFrame with storage type of STORAGE_GPU_MEMORY_BUFFER from it. This
extracts the VideoFrame creation logic into a new function:
CreateVideoFrameFromGpuMemoryBufferHandle(). The new function is called
by the original CreateGpuMemoryBufferVideoFrame() function and is also
used by NativePixmapFrameResource::CreateVideoFrame().

Bug: b:277581596
Test: Test and chrome targets compile

Change-Id: Id028883c2153f18dc0a08396ac2b6222facb96f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5153222
Commit-Queue: Nathan Hebert <nhebert@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1272854}