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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_
66