ui/gfx/android/device_display_info.h

   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/basictypes.h"
  12 #include "ui/gfx/gfx_export.h"
  13
  14 namespace gfx {
  15
  16 // Facilitates access to device information typically only
  17 // available using the Android SDK, including Display properties.
  18 class GFX_EXPORT DeviceDisplayInfo {
  19  public:
  20   DeviceDisplayInfo();
  21   ~DeviceDisplayInfo();
  22
  23   // Returns display height in physical pixels.
  24   int GetDisplayHeight();
  25
  26   // Returns display width in physical pixels.
  27   int GetDisplayWidth();
  28
  29   // Returns real display height in physical pixels.
  30   // This version does not subtract window decorations etc.
  31   // WARNING: This is only supported on JB-MR1 (sdk >= 17). Either
  32   //          check the SDK-level, or check for '0' being returned.
  33   int GetPhysicalDisplayHeight();
  34
  35   // Returns real display width in physical pixels.
  36   // This version does not subtract window decorations etc.
  37   // WARNING: This is only supported on JB-MR1 (sdk >= 17). Either
  38   //          check the SDK-level, or check for '0' being returned.
  39   int GetPhysicalDisplayWidth();
  40
  41   // Returns number of bits per pixel.
  42   int GetBitsPerPixel();
  43
  44   // Returns number of bits per component.
  45   int GetBitsPerComponent();
  46
  47   // Returns a scaling factor for Density Independent Pixel unit
  48   // (1.0 is 160dpi, 0.75 is 120dpi, 2.0 is 320dpi).
  49   double GetDIPScale();
  50
  51   // Smallest possible screen size in density-independent pixels.
  52   int GetSmallestDIPWidth();
  53
  54   // Returns the display rotation angle from its natural orientation. Expected
  55   // values are one of { 0, 90, 180, 270 }.
  56   // See DeviceDispayInfo.java for more information.
  57   int GetRotationDegrees();
  58
  59  private:
  60   DISALLOW_COPY_AND_ASSIGN(DeviceDisplayInfo);
  61 };
  62
  63 }  // namespace gfx
  64
  65 #endif  // UI_GFX_ANDROID_DEVICE_DISPLAY_INFO_H_