Implement DRM Native Pixmap using prime buffer

ui/ozone/platform/drm/common/client_native_pixmap_vgem.cc

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ui/ozone/platform/drm/common/client_native_pixmap_vgem.h"
-
-#include <fcntl.h>
-#include <libdrm/vgem_drm.h>
-#include <stddef.h>
-#include <sys/mman.h>
-#include <xf86drm.h>
-
-#include "base/process/memory.h"
-#include "base/trace_event/trace_event.h"
-
-namespace ui {
-
-// static
-scoped_ptr<ClientNativePixmap> ClientNativePixmapVgem::ImportFromDmabuf(
-    int vgem_fd,
-    int dmabuf_fd,
-    const gfx::Size& size,
-    int stride) {
-  DCHECK_GE(vgem_fd, 0);
-  DCHECK_GE(dmabuf_fd, 0);
-  uint32_t vgem_bo_handle = 0;
-  int ret = drmPrimeFDToHandle(vgem_fd, dmabuf_fd, &vgem_bo_handle);
-  DCHECK(!ret) << "drmPrimeFDToHandle failed.";
-  return make_scoped_ptr(
-      new ClientNativePixmapVgem(vgem_fd, vgem_bo_handle, size, stride));
-}
-
-ClientNativePixmapVgem::ClientNativePixmapVgem(int vgem_fd,
-                                               uint32_t vgem_bo_handle,
-                                               const gfx::Size& size,
-                                               int stride)
-    : vgem_fd_(vgem_fd),
-      vgem_bo_handle_(vgem_bo_handle),
-      size_(size),
-      stride_(stride),
-      data_(nullptr) {
-  DCHECK(vgem_bo_handle_);
-  struct drm_mode_map_dumb mmap_arg = {0};
-  mmap_arg.handle = vgem_bo_handle_;
-  size_t map_size = stride_ * size_.height();
-  int ret = drmIoctl(vgem_fd_, DRM_IOCTL_VGEM_MODE_MAP_DUMB, &mmap_arg);
-  if (ret) {
-    PLOG(ERROR) << "fail to map a vgem buffer.";
-    base::TerminateBecauseOutOfMemory(map_size);
-  }
-  DCHECK(mmap_arg.offset);
-
-  data_ = mmap(nullptr, map_size, (PROT_READ | PROT_WRITE), MAP_SHARED,
-               vgem_fd_, mmap_arg.offset);
-  DCHECK_NE(data_, MAP_FAILED);
-}
-
-ClientNativePixmapVgem::~ClientNativePixmapVgem() {
-  size_t size = stride_ * size_.height();
-  int ret = munmap(data_, size);
-  DCHECK(!ret) << "fail to munmap a vgem buffer.";
-
-  struct drm_gem_close close = {0};
-  close.handle = vgem_bo_handle_;
-  ret = drmIoctl(vgem_fd_, DRM_IOCTL_GEM_CLOSE, &close);
-  DCHECK(!ret) << "fail to free a vgem buffer.";
-}
-
-void* ClientNativePixmapVgem::Map() {
-  return data_;
-}
-
-void ClientNativePixmapVgem::Unmap() {}
-
-void ClientNativePixmapVgem::GetStride(int* stride) const {
-  *stride = stride_;
-}
-
-}  // namespace ui