Reland of Android: support multiple displays on C++ side

ui/android/display_android_manager.cc

+// Copyright 2012 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/android/display_android_manager.h"
+
+#include <jni.h>
+#include <map>
+
+#include "base/android/jni_android.h"
+#include "base/stl_util.h"
+#include "jni/DisplayAndroidManager_jni.h"
+#include "ui/android/screen_android.h"
+#include "ui/android/window_android.h"
+#include "ui/display/display.h"
+
+namespace ui {
+
+using base::android::AttachCurrentThread;
+using display::Display;
+using display::DisplayList;
+
+void SetScreenAndroid() {
+  // Do not override existing Screen.
+  DCHECK_EQ(display::Screen::GetScreen(), nullptr);
+
+  DisplayAndroidManager* manager = new DisplayAndroidManager();
+  display::Screen::SetScreenInstance(manager);
+
+  JNIEnv* env = AttachCurrentThread();
+  Java_DisplayAndroidManager_onNativeSideCreated(env, (jlong)manager);
+}
+
+bool RegisterScreenAndroid(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+DisplayAndroidManager::DisplayAndroidManager() {}
+
+DisplayAndroidManager::~DisplayAndroidManager() {}
+
+// Screen interface.
+
+Display DisplayAndroidManager::GetDisplayNearestWindow(
+    gfx::NativeView view) const {
+  ui::WindowAndroid* window = view ? view->GetWindowAndroid() : nullptr;
+  if (window) {
+    DisplayList::Displays::const_iterator it =
+        display_list().FindDisplayById(window->display_id());
+    if (it != display_list().displays().end()) {
+      return *it;
+    }
+  }
+  return GetPrimaryDisplay();
+}
+
+// There is no notion of relative display positions on Android.
+Display DisplayAndroidManager::GetDisplayNearestPoint(
+    const gfx::Point& point) const {
+  NOTIMPLEMENTED();
+  return GetPrimaryDisplay();
+}
+
+// There is no notion of relative display positions on Android.
+Display DisplayAndroidManager::GetDisplayMatching(
+    const gfx::Rect& match_rect) const {
+  NOTIMPLEMENTED();
+  return GetPrimaryDisplay();
+}
+
+// Methods called from Java
+
+void DisplayAndroidManager::UpdateDisplay(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jobject,
+    jint sdkDisplayId,
+    jint physicalWidth,
+    jint physicalHeight,
+    jint width,
+    jint height,
+    jfloat dipScale,
+    jint rotationDegrees,
+    jint bitsPerPixel,
+    jint bitsPerComponent) {
+  gfx::Rect bounds_in_pixels = gfx::Rect(physicalWidth, physicalHeight);
+
+  // Physical width and height might be not supported.
+  if (bounds_in_pixels.IsEmpty())
+    bounds_in_pixels = gfx::Rect(width, height);
+
+  const gfx::Rect bounds_in_dip = gfx::Rect(
+      gfx::ScaleToCeiledSize(bounds_in_pixels.size(), 1.0f / dipScale));
+
+  display::Display display(sdkDisplayId, bounds_in_dip);
+  if (!Display::HasForceDeviceScaleFactor())
+    display.set_device_scale_factor(dipScale);
+
+  display.SetRotationAsDegree(rotationDegrees);
+  display.set_color_depth(bitsPerPixel);
+  display.set_depth_per_component(bitsPerComponent);
+  display.set_is_monochrome(bitsPerComponent == 0);
+
+  ProcessDisplayChanged(display, sdkDisplayId == primary_display_id_);
+}
+
+void DisplayAndroidManager::RemoveDisplay(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jobject,
+    jint sdkDisplayId) {
+  display_list().RemoveDisplay(sdkDisplayId);
+}
+
+void DisplayAndroidManager::SetPrimaryDisplayId(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& jobject,
+    jint sdkDisplayId) {
+  primary_display_id_ = sdkDisplayId;
+}
+
+}  // namespace ui