Add initial SHM-only Wayland Ozone implementation

ui/ozone/platform/wayland/wayland_display.cc

+// Copyright 2016 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/wayland/wayland_display.h"
+
+#include "base/logging.h"
+#include "base/message_loop/message_loop.h"
+#include "ui/ozone/platform/wayland/wayland_object.h"
+#include "ui/ozone/platform/wayland/wayland_window.h"
+
+static_assert(XDG_SHELL_VERSION_CURRENT == 5, "Unsupported xdg-shell version");
+
+namespace ui {
+
+WaylandDisplay::WaylandDisplay() {}
+
+WaylandDisplay::~WaylandDisplay() {}
+
+bool WaylandDisplay::Initialize() {
+  static const wl_registry_listener registry_listener = {
+      .global = &WaylandDisplay::Global,
+      .global_remove = &WaylandDisplay::GlobalRemove,
+  };
+
+  display_.reset(wl_display_connect(nullptr));
+  if (!display_) {
+    LOG(ERROR) << "Failed to connect to Wayland display";
+    return false;
+  }
+
+  registry_.reset(wl_display_get_registry(display_.get()));
+  if (!registry_) {
+    LOG(ERROR) << "Failed to get Wayland registry";
+    return false;
+  }
+
+  wl_registry_add_listener(registry_.get(), &registry_listener, this);
+  wl_display_roundtrip(display_.get());
+
+  if (!compositor_) {
+    LOG(ERROR) << "No wl_compositor object";
+    return false;
+  }
+  if (!shm_) {
+    LOG(ERROR) << "No wl_shm object";
+    return false;
+  }
+  if (!shell_) {
+    LOG(ERROR) << "No xdg_shell object";
+    return false;
+  }
+
+  return true;
+}
+
+void WaylandDisplay::Flush() {
+  DCHECK(display_);
+  wl_display_flush(display_.get());
+}
+
+wl_compositor* WaylandDisplay::GetCompositor() {
+  DCHECK(compositor_);
+  return compositor_.get();
+}
+
+wl_shm* WaylandDisplay::GetShm() {
+  DCHECK(shm_);
+  return shm_.get();
+}
+
+xdg_shell* WaylandDisplay::GetShell() {
+  DCHECK(shell_);
+  return shell_.get();
+}
+
+WaylandWindow* WaylandDisplay::GetWindow(gfx::AcceleratedWidget widget) {
+  auto it = windows_.find(widget);
+  return it == windows_.end() ? nullptr : it->second;
+}
+
+void WaylandDisplay::AddWindow(WaylandWindow* window) {
+  windows_[window->GetWidget()] = window;
+}
+
+void WaylandDisplay::RemoveWindow(WaylandWindow* window) {
+  windows_.erase(window->GetWidget());
+}
+
+void WaylandDisplay::StartProcessingEvents() {
+  if (watching_)
+    return;
+
+  DCHECK(display_);
+  DCHECK(base::MessageLoopForUI::IsCurrent());
+  base::MessageLoopForUI::current()->WatchFileDescriptor(
+      wl_display_get_fd(display_.get()), true,
+      base::MessagePumpLibevent::WATCH_READ, &controller_, this);
+  watching_ = true;
+}
+
+void WaylandDisplay::OnFileCanReadWithoutBlocking(int fd) {
+  wl_display_dispatch(display_.get());
+  for (const auto& window : windows_)
+    window.second->ApplyPendingBounds();
+}
+
+void WaylandDisplay::OnFileCanWriteWithoutBlocking(int fd) {}
+
+// static
+void WaylandDisplay::Global(void* data,
+                            wl_registry* registry,
+                            uint32_t name,
+                            const char* interface,
+                            uint32_t version) {
+  static const xdg_shell_listener shell_listener = {
+      .ping = &WaylandDisplay::Ping,
+  };
+
+  WaylandDisplay* display = static_cast<WaylandDisplay*>(data);
+  if (!display->compositor_ && strcmp(interface, "wl_compositor") == 0) {
+    display->compositor_ = wl::Bind<wl_compositor>(registry, name, version);
+    if (!display->compositor_)
+      LOG(ERROR) << "Failed to bind to wl_compositor global";
+  } else if (!display->shm_ && strcmp(interface, "wl_shm") == 0) {
+    display->shm_ = wl::Bind<wl_shm>(registry, name, version);
+    if (!display->shm_)
+      LOG(ERROR) << "Failed to bind to wl_shm global";
+  } else if (!display->shell_ && strcmp(interface, "xdg_shell") == 0) {
+    display->shell_ = wl::Bind<xdg_shell>(registry, name, version);
+    if (!display->shell_) {
+      LOG(ERROR) << "Failed to  bind to xdg_shell global";
+      return;
+    }
+    xdg_shell_add_listener(display->shell_.get(), &shell_listener, display);
+    xdg_shell_use_unstable_version(display->shell_.get(),
+                                   XDG_SHELL_VERSION_CURRENT);
+  }
+}
+
+// static
+void WaylandDisplay::GlobalRemove(void* data,
+                                  wl_registry* registry,
+                                  uint32_t name) {
+  NOTIMPLEMENTED();
+}
+
+// static
+void WaylandDisplay::Ping(void* data, xdg_shell* shell, uint32_t serial) {
+  xdg_shell_pong(shell, serial);
+}
+
+}  // namespace ui