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 10 label Chrome { 11 M22 = 0.1 12 }; 13 14 /* PPB_View_Dev interface */ 15 interface 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
