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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_DPI_WIN_H_
#define UI_GFX_DPI_WIN_H_
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/gfx_export.h"
namespace gfx {
// Sets the device scale factor that will be used unless overridden on the
// command line by --force-device-scale-factor. If this is not called, and that
// flag is not used, the scale factor used by the DIP conversion functions below
// will be that returned by GetDPIScale().
GFX_EXPORT void SetDefaultDeviceScaleFactor(float scale);
GFX_EXPORT Size GetDPI();
// Gets the scale factor of the display. For example, if the display DPI is
// 96 then the scale factor is 1.0. This clamps scale factors <= 1.25 to 1.0 to
// maintain previous (non-DPI-aware) behavior where only the font size was
// boosted.
GFX_EXPORT float GetDPIScale();
namespace win {
GFX_EXPORT Point ScreenToDIPPoint(const Point& pixel_point);
GFX_EXPORT Point DIPToScreenPoint(const Point& dip_point);
// WARNING: there is no right way to scale sizes and rects. The implementation
// of these strives to maintain a constant size by scaling the size independent
// of the origin. An alternative is to get the enclosing rect, which is the
// right way for some situations. Understand which you need before blindly
// assuming this is the right way.
GFX_EXPORT Rect ScreenToDIPRect(const Rect& pixel_bounds);
GFX_EXPORT Rect DIPToScreenRect(const Rect& dip_bounds);
GFX_EXPORT Size ScreenToDIPSize(const Size& size_in_pixels);
GFX_EXPORT Size DIPToScreenSize(const Size& dip_size);
// Win32's GetSystemMetrics uses pixel measures. This function calls
// GetSystemMetrics for the given |metric|, then converts the result to DIP.
GFX_EXPORT int GetSystemMetricsInDIP(int metric);
} // namespace win
} // namespace gfx
#endif // UI_GFX_DPI_WIN_H_
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