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 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. 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 blink 39 40 #endif // CSSHelper_h 41
