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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_DISPLAY_WIN_DPI_H_
#define UI_DISPLAY_WIN_DPI_H_
#include "ui/display/display_export.h"
namespace display {
namespace win {
// Deprecated. Use --force-device-scale-factor instead.
//
// Sets the device scale factor that will be used unless overridden on the
// command line by --force-device-scale-factor.
DISPLAY_EXPORT void SetDefaultDeviceScaleFactor(float scale);
// Deprecated. Use win::ScreenWin::GetScaleFactorForHWND instead.
//
// Gets the system's scale factor. For example, if the system DPI is 96 then the
// scale factor is 1.0. This does not handle per-monitor DPI.
DISPLAY_EXPORT float GetDPIScale();
// Deprecated. Use win::ScreenWin::GetDPIForHWND instead.
//
// Returns the equivalent DPI for |device_scaling_factor|.
DISPLAY_EXPORT int GetDPIFromScalingFactor(float device_scaling_factor);
// Returns a factor to adjust a system font's height by, to adjust for
// accessibility measures already built into the font, in order to prevent
// applying the same scale factor twice. Value should be in the range
// 0.0 (exclusive) to 1.0 (inclusive).
//
// Windows will add text scaling factor into the logical size of its default
// system fonts (which it does *not* do for DPI scaling). Since we're scaling
// the entire UI by a combination of text scale and DPI scale, this results in
// double scaling. Call this function to unscale the font before using it in
// any of our rendering code.
DISPLAY_EXPORT double GetAccessibilityFontScale();
namespace internal {
// Note: These methods do not take accessibility adjustments into account.
// Equivalent to GetDPIScale() but ignores the --force-device-scale-factor flag.
float GetUnforcedDeviceScaleFactor();
// Returns the equivalent scaling factor for |dpi|.
float GetScalingFactorFromDPI(int dpi);
// Gets the default DPI for the system.
int GetDefaultSystemDPI();
} // namespace internal
} // namespace win
} // namespace display
#endif // UI_DISPLAY_WIN_DPI_H_
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