[Cleanup] Factor out layout store code from DisplayController

ash/display/display_layout_store.cc

+// Copyright (c) 2013 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 <stdio.h>
+
+#include "ash/ash_switches.h"
+#include "ash/display/display_layout_store.h"
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "ui/gfx/display.h"
+
+namespace ash {
+namespace internal {
+
+DisplayLayoutStore::DisplayLayoutStore() {
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kAshSecondaryDisplayLayout)) {
+    std::string value = command_line->GetSwitchValueASCII(
+        switches::kAshSecondaryDisplayLayout);
+    char layout;
+    int offset = 0;
+    if (sscanf(value.c_str(), "%c,%d", &layout, &offset) == 2) {
+      if (layout == 't')
+        default_display_layout_.position = DisplayLayout::TOP;
+      else if (layout == 'b')
+        default_display_layout_.position = DisplayLayout::BOTTOM;
+      else if (layout == 'r')
+        default_display_layout_.position = DisplayLayout::RIGHT;
+      else if (layout == 'l')
+        default_display_layout_.position = DisplayLayout::LEFT;
+      default_display_layout_.offset = offset;
+    }
+  }
+}
+
+DisplayLayoutStore::~DisplayLayoutStore() {
+}
+
+void DisplayLayoutStore::SetDefaultDisplayLayout(const DisplayLayout& layout) {
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (!command_line->HasSwitch(switches::kAshSecondaryDisplayLayout))
+    default_display_layout_ = layout;
+}
+
+void DisplayLayoutStore::RegisterLayoutForDisplayIdPair(
+    int64 id1,
+    int64 id2,
+    const DisplayLayout& layout) {
+  paired_layouts_[std::make_pair(id1, id2)] = layout;
+}
+
+DisplayLayout DisplayLayoutStore::GetRegisteredDisplayLayout(
+    const DisplayIdPair& pair) {
+  std::map<DisplayIdPair, DisplayLayout>::const_iterator iter =
+      paired_layouts_.find(pair);
+  return
+      iter != paired_layouts_.end() ? iter->second : CreateDisplayLayout(pair);
+}
+
+DisplayLayout DisplayLayoutStore::ComputeDisplayLayoutForDisplayIdPair(
+    const DisplayIdPair& pair) {
+  DisplayLayout layout = GetRegisteredDisplayLayout(pair);
+  DCHECK_NE(layout.primary_id, gfx::Display::kInvalidDisplayID);
+  // Invert if the primary was swapped. If mirrored, first is always
+  // primary.
+  return (layout.primary_id == gfx::Display::kInvalidDisplayID ||
+          pair.first == layout.primary_id) ? layout : layout.Invert();
+}
+
+void DisplayLayoutStore::UpdateMirrorStatus(const DisplayIdPair& pair,
+                                            bool mirrored) {
+  if (paired_layouts_.find(pair) == paired_layouts_.end())
+    CreateDisplayLayout(pair);
+  paired_layouts_[pair].mirrored = mirrored;
+}
+
+void DisplayLayoutStore::UpdatePrimaryDisplayId(const DisplayIdPair& pair,
+                                                int64 display_id) {
+  if (paired_layouts_.find(pair) == paired_layouts_.end())
+    CreateDisplayLayout(pair);
+  paired_layouts_[pair].primary_id = display_id;
+}
+
+DisplayLayout DisplayLayoutStore::CreateDisplayLayout(
+    const DisplayIdPair& pair) {
+  DisplayLayout layout = default_display_layout_;
+  layout.primary_id = pair.first;
+  paired_layouts_[pair] = layout;
+  return layout;
+}
+
+}  // namespace internal
+}  // namespace ash