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/base/ui_export.h" 14 15 namespace gfx { 16 17 // Facilitates access to device information typically only 18 // available using the Android SDK, including Display properties. 19 class UI_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 // Registers methods with JNI and returns true if succeeded. 41 static bool RegisterDeviceDisplayInfo(JNIEnv* env); 42 43 private: 44 base::android::ScopedJavaGlobalRef<jobject> j_device_info_; 45 46 DISALLOW_COPY_AND_ASSIGN(DeviceDisplayInfo); 47 }; 48 49 } // namespace gfx 50 51 #endif // UI_GFX_ANDROID_DEVICE_DISPLAY_INFO_H_ 52
