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 PPAPI_CPP_DEV_VIEW_DEV_H_
6#define PPAPI_CPP_DEV_VIEW_DEV_H_
7
8#include "ppapi/cpp/view.h"
9
10namespace pp {
11
12// ViewDev is a version of View that exposes under-development APIs related to
13// HiDPI
14class ViewDev : public View {
15 public:
16  ViewDev() : View() {}
17  ViewDev(const View& other) : View(other) {}
18
19  virtual ~ViewDev() {}
20
21  /// GetDeviceScale returns the scale factor between device pixels and DIPs
22  /// (also known as logical pixels or UI pixels on some platforms). This allows
23  /// the developer to render their contents at device resolution, even as
24  /// coordinates / sizes are given in DIPs through the API.
25  ///
26  /// Note that the coordinate system for Pepper APIs is DIPs. Also note that
27  /// one DIP might not equal one CSS pixel - when page scale/zoom is in effect.
28  ///
29  /// @return A <code>float</code> value representing the number of device
30  /// pixels per DIP.
31  float GetDeviceScale() const;
32
33  /// GetCSSScale returns the scale factor between DIPs and CSS pixels. This
34  /// allows proper scaling between DIPs - as sent via the Pepper API - and CSS
35  /// pixel coordinates used for Web content.
36  ///
37  /// @return A <code>float</code> value representing the number of DIPs per CSS
38  /// pixel.
39  float GetCSSScale() const;
40};
41
42}  // namespace pp
43
44#endif  // PPAPI_CPP_DEV_VIEW_DEV_H_
45