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 UI_GFX_DPI_WIN_H_ 6#define UI_GFX_DPI_WIN_H_ 7 8#include "ui/gfx/gfx_export.h" 9#include "ui/gfx/point.h" 10#include "ui/gfx/rect.h" 11#include "ui/gfx/size.h" 12 13namespace gfx { 14 15// Initialization of the scale factor that should be applied for rendering 16// in this process. Must be called before attempts to call any of the getter 17// methods below in this file, e.g. in the early toolkit/resource bundle setup. 18// This can be called multiple times during various tests, but subsequent calls 19// have no effect. 20GFX_EXPORT void InitDeviceScaleFactor(float scale); 21 22GFX_EXPORT Size GetDPI(); 23 24// Gets the scale factor of the display. For example, if the display DPI is 25// 96 then the scale factor is 1.0. 26GFX_EXPORT float GetDPIScale(); 27 28// Tests to see if the command line flag "--high-dpi-support" is set. 29GFX_EXPORT bool IsHighDPIEnabled(); 30 31GFX_EXPORT bool IsInHighDPIMode(); 32 33GFX_EXPORT void EnableHighDPISupport(); 34 35GFX_EXPORT void ForceHighDPISupportForTesting(float scale); 36 37// TODO(kevers|girard): Move above methods into win namespace. 38 39namespace win { 40 41GFX_EXPORT float GetDeviceScaleFactor(); 42 43GFX_EXPORT Point ScreenToDIPPoint(const Point& pixel_point); 44 45GFX_EXPORT Point DIPToScreenPoint(const Point& dip_point); 46 47// WARNING: there is no right way to scale sizes and rects. The implementation 48// of these strives to maintain a constant size by scaling the size independent 49// of the origin. An alternative is to get the enclosing rect, which is the 50// right way for some situations. Understand which you need before blindly 51// assuming this is the right way. 52GFX_EXPORT Rect ScreenToDIPRect(const Rect& pixel_bounds); 53GFX_EXPORT Rect DIPToScreenRect(const Rect& dip_bounds); 54GFX_EXPORT Size ScreenToDIPSize(const Size& size_in_pixels); 55GFX_EXPORT Size DIPToScreenSize(const Size& dip_size); 56 57// Win32's GetSystemMetrics uses pixel measures. This function calls 58// GetSystemMetrics for the given |metric|, then converts the result to DIP. 59GFX_EXPORT int GetSystemMetricsInDIP(int metric); 60 61// Returns true if the global device scale factor has been explicitly set for 62// the process. 63GFX_EXPORT bool IsDeviceScaleFactorSet(); 64 65GFX_EXPORT extern const wchar_t kRegistryProfilePath[]; 66GFX_EXPORT extern const wchar_t kHighDPISupportW[]; 67 68} // namespace win 69} // namespace gfx 70 71#endif // UI_GFX_DPI_WIN_H_ 72