shared_device_display_info.h revision 0529e5d033099cbfc42635f6f6183833b09dff6e 
1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef UI_GFX_ANDROID_SHARED_DEVICE_DISPLAY_INFO_H_
6#define UI_GFX_ANDROID_SHARED_DEVICE_DISPLAY_INFO_H_
7
8#include "base/android/scoped_java_ref.h"
9#include "base/basictypes.h"
10#include "base/memory/singleton.h"
11#include "base/synchronization/lock.h"
12
13namespace gfx {
14
15// Facilitates access to device information typically only
16// available using the Android SDK, including Display properties.
17class SharedDeviceDisplayInfo {
18 public:
19  static SharedDeviceDisplayInfo* GetInstance();
20
21  // See documentation in DeviceDisplayInfo.java
22  int GetDisplayHeight();
23  int GetDisplayWidth();
24  int GetPhysicalDisplayHeight();
25  int GetPhysicalDisplayWidth();
26  int GetBitsPerPixel();
27  int GetBitsPerComponent();
28  double GetDIPScale();
29  int GetSmallestDIPWidth();
30  int GetRotationDegrees();
31
32  // Registers methods with JNI and returns true if succeeded.
33  static bool RegisterSharedDeviceDisplayInfo(JNIEnv* env);
34
35  void InvokeUpdate(JNIEnv* env,
36                    jobject jobj,
37                    jint display_height,
38                    jint display_width,
39                    jint physical_display_height,
40                    jint physical_display_width,
41                    jint bits_per_pixel,
42                    jint bits_per_component,
43                    jdouble dip_scale,
44                    jint smallest_dip_width,
45                    jint rotation_degrees);
46 private:
47  friend struct DefaultSingletonTraits<SharedDeviceDisplayInfo>;
48
49  SharedDeviceDisplayInfo();
50  ~SharedDeviceDisplayInfo();
51  void UpdateDisplayInfo(JNIEnv* env,
52                         jobject jobj,
53                         jint display_height,
54                         jint display_width,
55                         jint physical_display_height,
56                         jint physical_display_width,
57                         jint bits_per_pixel,
58                         jint bits_per_component,
59                         jdouble dip_scale,
60                         jint smallest_dip_width,
61                         jint rotation_degrees);
62
63  base::Lock lock_;
64  base::android::ScopedJavaGlobalRef<jobject> j_device_info_;
65
66  int display_height_;
67  int display_width_;
68  int physical_display_height_;
69  int physical_display_width_;
70  int bits_per_pixel_;
71  int bits_per_component_;
72  double dip_scale_;
73  int smallest_dip_width_;
74  int rotation_degrees_;
75
76  DISALLOW_COPY_AND_ASSIGN(SharedDeviceDisplayInfo);
77};
78
79}  // namespace gfx
80
81#endif // UI_GFX_ANDROID_SHARED_DEVICE_DISPLAY_INFO_H_
82