ozone/platform/wayland: Add support for wl_output_interface

ui/ozone/platform/wayland/wayland_screen.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_screen.h"
+
+#include <wayland-client.h>
+
+#include "ui/ozone/platform/wayland/wayland_display.h"
+
+namespace ui {
+
+WaylandScreen::WaylandScreen(wl_registry* registry, uint32_t name)
+    : output_(nullptr), name_(name), refresh_(0), rect_(0, 0, 0, 0) {
+  static const wl_output_listener output_listener = {
+      &WaylandScreen::OutputHandleGeometry, &WaylandScreen::OutputHandleMode,
+  };
+
+  output_ = wl::Bind<wl_output>(registry, name, 1);

[Michael Forney, 2016/06/10 18:12:21]

I think you should bind the object in wayland_display.cc, and then pass the
wl_output* to the constructor, like wayland_pointer.cc does.

Otherwise, if wl_registry_bind returns NULL, this objects is only partially
constructed, and the caller has no way to know.

[joone, 2016/06/14 00:04:43]

Done.

+  if (!output_) {
+    LOG(ERROR) << "Failed to  bind to wl_output global";
+    return;
+  }
+
+  wl_output_add_listener(output_.get(), &output_listener, this);
+}
+
+WaylandScreen::~WaylandScreen() {}
+
+// static
+void WaylandScreen::OutputHandleGeometry(void* data,
+                                         wl_output* output,
+                                         int32_t x,
+                                         int32_t y,
+                                         int32_t physical_width,
+                                         int32_t physical_height,
+                                         int32_t subpixel,
+                                         const char* make,
+                                         const char* model,
+                                         int32_t output_transform) {
+  WaylandScreen* screen = static_cast<WaylandScreen*>(data);
+  screen->rect_.set_origin(gfx::Point(x, y));
+}
+
+// static
+void WaylandScreen::OutputHandleMode(void* data,
+                                     wl_output* wl_output,
+                                     uint32_t flags,
+                                     int32_t width,
+                                     int32_t height,
+                                     int32_t refresh) {
+  WaylandScreen* screen = static_cast<WaylandScreen*>(data);
+
+  if (flags & WL_OUTPUT_MODE_CURRENT) {
+    screen->rect_.set_width(width);
+    screen->rect_.set_height(height);
+    screen->refresh_ = refresh;
+
+    if (!WaylandDisplay::GetInstance())
+      return;
+
+    WaylandDisplay::GetInstance()->OnOutputGeometryChanged(screen->name_,
+                                                           screen->rect_);
+  }
+}
+
+}  // namespace ui