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   int GetDisplayHeight();
  22   int GetDisplayWidth();
  23   int GetBitsPerPixel();
  24   int GetBitsPerComponent();
  25   double GetDIPScale();
  26   int GetSmallestDIPWidth();
  27
  28   // Registers methods with JNI and returns true if succeeded.
  29   static bool RegisterSharedDeviceDisplayInfo(JNIEnv* env);
  30
  31   void InvokeUpdate(JNIEnv* env,
  32                     jobject jobj,
  33                     jint display_height,
  34                     jint display_width,
  35                     jint bits_per_pixel,
  36                     jint bits_per_component,
  37                     jdouble dip_scale,
  38                     jint smallest_dip_width);
  39  private:
  40   friend struct DefaultSingletonTraits<SharedDeviceDisplayInfo>;
  41
  42   SharedDeviceDisplayInfo();
  43   ~SharedDeviceDisplayInfo();
  44   void UpdateDisplayInfo(JNIEnv* env,
  45                          jobject jobj,
  46                          jint display_height,
  47                          jint display_width,
  48                          jint bits_per_pixel,
  49                          jint bits_per_component,
  50                          jdouble dip_scale,
  51                          jint smallest_dip_width);
  52
  53   base::Lock lock_;
  54   base::android::ScopedJavaGlobalRef<jobject> j_device_info_;
  55
  56   int display_height_;
  57   int display_width_;
  58   int bits_per_pixel_;
  59   int bits_per_component_;
  60   double dip_scale_;
  61   int smallest_dip_width_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(SharedDeviceDisplayInfo);
  64 };
  65
  66 }  // namespace gfx
  67
  68 #endif // UI_GFX_ANDROID_SHARED_DEVICE_DISPLAY_INFO_H_