device_display_info.h revision 8bcbed890bc3ce4d7a057a8f32cab53fa534672e 
1// Copyright (c) 2012 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_DEVICE_DISPLAY_INFO_H_
6#define UI_GFX_ANDROID_DEVICE_DISPLAY_INFO_H_
7
8#include <jni.h>
9#include <string>
10
11#include "base/android/scoped_java_ref.h"
12#include "base/basictypes.h"
13#include "ui/gfx/gfx_export.h"
14
15namespace gfx {
16
17// Facilitates access to device information typically only
18// available using the Android SDK, including Display properties.
19class GFX_EXPORT DeviceDisplayInfo {
20 public:
21  DeviceDisplayInfo();
22  ~DeviceDisplayInfo();
23
24  // Returns display height in physical pixels.
25  int GetDisplayHeight();
26
27  // Returns display width in physical pixels.
28  int GetDisplayWidth();
29
30  // Returns number of bits per pixel.
31  int GetBitsPerPixel();
32
33  // Returns number of bits per component.
34  int GetBitsPerComponent();
35
36  // Returns a scaling factor for Density Independent Pixel unit
37  // (1.0 is 160dpi, 0.75 is 120dpi, 2.0 is 320dpi).
38  double GetDIPScale();
39
40  // Smallest possible screen size in density-independent pixels.
41  int GetSmallestDIPWidth();
42
43  // Registers methods with JNI and returns true if succeeded.
44  static bool RegisterDeviceDisplayInfo(JNIEnv* env);
45
46 private:
47  base::android::ScopedJavaGlobalRef<jobject> j_device_info_;
48
49  DISALLOW_COPY_AND_ASSIGN(DeviceDisplayInfo);
50};
51
52}  // namespace gfx
53
54#endif  // UI_GFX_ANDROID_DEVICE_DISPLAY_INFO_H_
55