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_ 69