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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
6/* This file contains the <code>PPB_View_Dev</code> interface. */
7
8[generate_thunk]
9
10label Chrome {
11  M22 = 0.1
12};
13
14/* PPB_View_Dev interface */
15interface PPB_View_Dev {
16  /**
17   * GetDeviceScale returns the scale factor between device pixels and DIPs
18   * (also known as logical pixels or UI pixels on some platforms). This allows
19   * the developer to render their contents at device resolution, even as
20   * coordinates / sizes are given in DIPs through the API.
21   *
22   * Note that the coordinate system for Pepper APIs is DIPs. Also note that
23   * one DIP might not equal one CSS pixel - when page scale/zoom is in effect.
24   *
25   * @param[in] resource A <code>PP_Resource</code> corresponding to a
26   * <code>PPB_View</code> resource.
27   *
28   * @return A <code>float</code> value representing the number of device pixels
29   * per DIP. If the resource is invalid, the value will be 0.0.
30   */
31  float_t GetDeviceScale([in] PP_Resource resource);
32
33  /**
34   * GetCSSScale returns the scale factor between DIPs and CSS pixels. This
35   * allows proper scaling between DIPs - as sent via the Pepper API - and CSS
36   * pixel coordinates used for Web content.
37   *
38   * @param[in] resource A <code>PP_Resource</code> corresponding to a
39   * <code>PPB_View</code> resource.
40   *
41   * @return css_scale A <code>float</code> value representing the number of
42   * DIPs per CSS pixel. If the resource is invalid, the value will be 0.0.
43   */
44  float_t GetCSSScale([in] PP_Resource resource);
45};
46
47