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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) 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 
     27 namespace WebCore {
     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.
     32 const double cssPixelsPerInch = 96;
     33 const double cssPixelsPerCentimeter = cssPixelsPerInch / 2.54; // 2.54 cm/in
     34 const double cssPixelsPerMillimeter = cssPixelsPerCentimeter / 10;
     35 const double cssPixelsPerPoint = cssPixelsPerInch / 72;
     36 const double cssPixelsPerPica = cssPixelsPerInch / 6;
     37 
     38 } // namespace WebCore
     39 
     40 #endif // CSSHelper_h
     41