1// Copyright (c) 2011 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 PRINTING_UNITS_H_
6#define PRINTING_UNITS_H_
7
8#include "printing/printing_export.h"
9
10namespace printing {
11
12// Length of a thousanth of inches in 0.01mm unit.
13const int kHundrethsMMPerInch = 2540;
14
15// Length of an inch in CSS's 1pt unit.
16// http://dev.w3.org/csswg/css3-values/#absolute-length-units-cm-mm.-in-pt-pc
17const int kPointsPerInch = 72;
18
19// Length of an inch in CSS's 1px unit.
20// http://dev.w3.org/csswg/css3-values/#the-px-unit
21const int kPixelsPerInch = 96;
22
23// Converts from one unit system to another using integer arithmetics.
24PRINTING_EXPORT int ConvertUnit(int value, int old_unit, int new_unit);
25
26// Converts from one unit system to another using doubles.
27PRINTING_EXPORT double ConvertUnitDouble(double value, double old_unit,
28                                         double new_unit);
29
30// Converts from 0.001 inch unit to 0.00001 meter.
31PRINTING_EXPORT int ConvertMilliInchToHundredThousanthMeter(int milli_inch);
32
33// Converts from 0.00001 meter unit to 0.001 inch.
34PRINTING_EXPORT int ConvertHundredThousanthMeterToMilliInch(int cmm);
35
36// Converts from 1 pixel to 1 point using integers.
37PRINTING_EXPORT int ConvertPixelsToPoint(int pixels);
38
39// Converts from 1 pixel to 1 point using doubles.
40PRINTING_EXPORT double ConvertPixelsToPointDouble(double pixels);
41
42// Converts from 1 point to 1 pixel using doubles.
43double ConvertPointsToPixelDouble(double points);
44
45}  // namespace printing
46
47#endif  // PRINTING_UNITS_H_
48