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 10 namespace pp { 11 12 // ViewDev is a version of View that exposes under-development APIs related to 13 // HiDPI 14 class ViewDev : public View { 15 public: ViewDev()16 ViewDev() : View() {} ViewDev(const View & other)17 ViewDev(const View& other) : View(other) {} 18 ~ViewDev()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