ui/gfx/android/shared_device_display_info.h

   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
  13 namespace gfx {
  14
  15 // Facilitates access to device information typically only
  16 // available using the Android SDK, including Display properties.
  17 class 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_