Refactor Windows DPI Point, Rect, and Size for Multiple Monitor DPI Awareness

ui/gfx/win/display_info.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/gfx/win/display_info.h"
+
+#include "base/hash.h"
+#include "base/strings/utf_string_conversions.h"
+
+namespace {
+
+gfx::Display::Rotation GetRotationForDevice(const wchar_t* device_name) {
+  DEVMODE mode;
+  ::ZeroMemory(&mode, sizeof(mode));
+  mode.dmSize = sizeof(DEVMODE);
+  mode.dmDriverExtra = 0;
+  if (::EnumDisplaySettings(device_name, ENUM_CURRENT_SETTINGS, &mode)) {
+    switch (mode.dmDisplayOrientation) {
+    case DMDO_DEFAULT:
+      return gfx::Display::ROTATE_0;
+    case DMDO_90:
+      return gfx::Display::ROTATE_90;
+    case DMDO_180:
+      return gfx::Display::ROTATE_180;
+    case DMDO_270:
+      return gfx::Display::ROTATE_270;
+    default:
+      NOTREACHED();
+    }
+  }
+  return gfx::Display::ROTATE_0;
+}
+
+}  // namespace
+
+namespace gfx {
+namespace win {
+
+int64_t DisplayInfo::HashDeviceName(const wchar_t* device_name) {
+  return static_cast<int64_t>(base::Hash(base::WideToUTF8(device_name)));
+}
+
+DisplayInfo::DisplayInfo(HMONITOR monitor, float device_scale_factor)
+    : device_scale_factor_(device_scale_factor){
+  MONITORINFOEX monitor_info;
+  ::ZeroMemory(&monitor_info, sizeof(monitor_info));
+  monitor_info.cbSize = sizeof(monitor_info);
+  ::GetMonitorInfo(monitor, &monitor_info);
+  InitializeFromMonitorInfo(monitor_info);
+}
+
+DisplayInfo::DisplayInfo(const MONITORINFOEX& monitor_info,
+                         gfx::Display::Rotation rotation,
+                         float device_scale_factor)
+    : rotation_(rotation),
+      device_scale_factor_(device_scale_factor) {
+  InitializeFromMonitorInfo(monitor_info);
+}
+
+int64_t DisplayInfo::id() const {
+  return id_;
+}
+
+gfx::Display::Rotation DisplayInfo::rotation() const {
+  return rotation_;
+}
+
+const gfx::Rect& DisplayInfo::screen_rect() const {
+  return screen_rect_;
+}
+
+const gfx::Rect& DisplayInfo::screen_work_rect() const {
+  return screen_work_rect_;
+}
+
+float DisplayInfo::device_scale_factor() const {
+  return device_scale_factor_;
+}
+
+void DisplayInfo::InitializeFromMonitorInfo(const MONITORINFOEX& monitor_info) {
+  id_ = HashDeviceName(monitor_info.szDevice);
+  screen_rect_ = gfx::Rect(monitor_info.rcMonitor);
+  screen_work_rect_ = gfx::Rect(monitor_info.rcWork);
+  rotation_ = GetRotationForDevice(monitor_info.szDevice);
+}
+
+}  // namespace win
+}  // namespace gfx