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 /* From dev/ppb_view_dev.idl modified Mon Jun 18 14:55:58 2012. */ 7 8 #ifndef PPAPI_C_DEV_PPB_VIEW_DEV_H_ 9 #define PPAPI_C_DEV_PPB_VIEW_DEV_H_ 10 11 #include "ppapi/c/pp_macros.h" 12 #include "ppapi/c/pp_resource.h" 13 #include "ppapi/c/pp_stdint.h" 14 15 #define PPB_VIEW_DEV_INTERFACE_0_1 "PPB_View(Dev);0.1" 16 #define PPB_VIEW_DEV_INTERFACE PPB_VIEW_DEV_INTERFACE_0_1 17 18 /** 19 * @file 20 * This file contains the <code>PPB_View_Dev</code> interface. */ 21 22 23 /** 24 * @addtogroup Interfaces 25 * @{ 26 */ 27 /* PPB_View_Dev interface */ 28 struct PPB_View_Dev_0_1 { 29 /** 30 * GetDeviceScale returns the scale factor between device pixels and DIPs 31 * (also known as logical pixels or UI pixels on some platforms). This allows 32 * the developer to render their contents at device resolution, even as 33 * coordinates / sizes are given in DIPs through the API. 34 * 35 * Note that the coordinate system for Pepper APIs is DIPs. Also note that 36 * one DIP might not equal one CSS pixel - when page scale/zoom is in effect. 37 * 38 * @param[in] resource A <code>PP_Resource</code> corresponding to a 39 * <code>PPB_View</code> resource. 40 * 41 * @return A <code>float</code> value representing the number of device pixels 42 * per DIP. If the resource is invalid, the value will be 0.0. 43 */ 44 float (*GetDeviceScale)(PP_Resource resource); 45 /** 46 * GetCSSScale returns the scale factor between DIPs and CSS pixels. This 47 * allows proper scaling between DIPs - as sent via the Pepper API - and CSS 48 * pixel coordinates used for Web content. 49 * 50 * @param[in] resource A <code>PP_Resource</code> corresponding to a 51 * <code>PPB_View</code> resource. 52 * 53 * @return css_scale A <code>float</code> value representing the number of 54 * DIPs per CSS pixel. If the resource is invalid, the value will be 0.0. 55 */ 56 float (*GetCSSScale)(PP_Resource resource); 57 }; 58 59 typedef struct PPB_View_Dev_0_1 PPB_View_Dev; 60 /** 61 * @} 62 */ 63 64 #endif /* PPAPI_C_DEV_PPB_VIEW_DEV_H_ */ 65 66