ui/display/util/display_util.h

// Copyright 2014 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_DISPLAY_UTIL_DISPLAY_UTIL_H_
#define UI_DISPLAY_UTIL_DISPLAY_UTIL_H_

#include <stdint.h>

#include "ui/display/util/display_util_export.h"
#include "ui/gfx/geometry/size.h"

namespace display {

// Returns true if a given size is in the list of bogus sizes in mm that should
// be ignored.
DISPLAY_UTIL_EXPORT bool IsDisplaySizeBlackListed(
    const gfx::Size& physical_size);

// Returns the desired device scale factor for the display with the given
// physical_size and resoultion.
DISPLAY_UTIL_EXPORT float GetScaleFactor(
    const gfx::Size& physical_size_in_mm,
    const gfx::Size& screen_size_in_pixels);

// Returns 64-bit persistent ID for the specified manufacturer's ID and
// product_code_hash, and the index of the output it is connected to.
// |output_index| is used to distinguish the displays of the same type. For
// example, swapping two identical display between two outputs will not be
// treated as swap. The 'serial number' field in EDID isn't used here because
// it is not guaranteed to have unique number and it may have the same fixed
// value (like 0).
DISPLAY_UTIL_EXPORT int64_t GenerateDisplayID(uint16_t manufacturer_id,
                                              uint32_t product_code_hash,
                                              uint8_t output_index);

}  // namespace display

#endif  // UI_DISPLAY_UTIL_DISPLAY_UTIL_H_