1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * Copyright (C) 2009 Apple Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB.  If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22#ifndef CSSHelper_h
23#define CSSHelper_h
24
25#include "wtf/Forward.h"
26
27namespace blink {
28
29// We always assume 96 CSS pixels in a CSS inch. This is the cold hard truth of the Web.
30// At high DPI, we may scale a CSS pixel, but the ratio of the CSS pixel to the so-called
31// "absolute" CSS length units like inch and pt is always fixed and never changes.
32const double cssPixelsPerInch = 96;
33const double cssPixelsPerCentimeter = cssPixelsPerInch / 2.54; // 2.54 cm/in
34const double cssPixelsPerMillimeter = cssPixelsPerCentimeter / 10;
35const double cssPixelsPerPoint = cssPixelsPerInch / 72;
36const double cssPixelsPerPica = cssPixelsPerInch / 6;
37
38} // namespace blink
39
40#endif // CSSHelper_h
41