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/*
* (C) 1999-2003 Lars Knoll (knoll@kde.org)
* Copyright (C) 2004, 2005, 2006, 2008, 2019 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#pragma once
namespace WTF {
class TextStream;
}
namespace WebCore {
namespace CSS {
// We always assume 96 CSS pixels in a CSS inch. This is the cold hard truth of the Web.
// At high DPI, we may scale a CSS pixel, but the ratio of the CSS pixel to the so-called
// "absolute" CSS length units like inch and pt is always fixed and never changes.
constexpr double pixelsPerInch = 96;
constexpr double pointsPerInch = 72;
constexpr double picasPerInch = 6;
constexpr double mmPerInch = 25.4;
constexpr double cmPerInch = 2.54;
constexpr double QPerInch = 25.4 * 4.0;
constexpr double pixelsPerCm = pixelsPerInch / cmPerInch;
constexpr double pixelsPerMm = pixelsPerInch / mmPerInch;
constexpr double pixelsPerQ = pixelsPerInch / QPerInch;
constexpr double pixelsPerPt = pixelsPerInch / pointsPerInch;
constexpr double pixelsPerPc = pixelsPerInch / picasPerInch;
constexpr double dppxPerX = 1.0;
constexpr double dppxPerDpi = 1.0 / pixelsPerInch;
constexpr double dppxPerDpcm = cmPerInch / pixelsPerInch;
constexpr double secondsPerMillisecond = 1.0 / 1000.0;
constexpr double hertzPerKilohertz = 1000.0;
}
// FIXME: No need to use all capitals and a CSS prefix on all these names. Should fix that.
enum class CSSUnitType : uint8_t {
CSS_UNKNOWN,
CSS_NUMBER,
CSS_INTEGER,
CSS_PERCENTAGE,
CSS_EM,
CSS_EX,
CSS_PX,
CSS_CM,
CSS_MM,
CSS_IN,
CSS_PT,
CSS_PC,
CSS_DEG,
CSS_RAD,
CSS_GRAD,
CSS_MS,
CSS_S,
CSS_HZ,
CSS_KHZ,
CSS_DIMENSION,
CSS_STRING,
CSS_URI,
CSS_IDENT,
CSS_ATTR,
CSS_VW,
CSS_VH,
CSS_VMIN,
CSS_VMAX,
CSS_VB,
CSS_VI,
CSS_SVW,
CSS_SVH,
CSS_SVMIN,
CSS_SVMAX,
CSS_SVB,
CSS_SVI,
CSS_LVW,
CSS_LVH,
CSS_LVMIN,
CSS_LVMAX,
CSS_LVB,
CSS_LVI,
CSS_DVW,
CSS_DVH,
CSS_DVMIN,
CSS_DVMAX,
CSS_DVB,
CSS_DVI,
FirstViewportCSSUnitType = CSS_VW,
LastViewportCSSUnitType = CSS_DVI,
CSS_CQW,
CSS_CQH,
CSS_CQI,
CSS_CQB,
CSS_CQMIN,
CSS_CQMAX,
CSS_DPPX,
CSS_X,
CSS_DPI,
CSS_DPCM,
CSS_FR,
CSS_Q,
CSS_LH,
CSS_RLH,
CustomIdent,
CSS_TURN,
CSS_REM,
CSS_REX,
CSS_CAP,
CSS_RCAP,
CSS_CH,
CSS_RCH,
CSS_IC,
CSS_RIC,
CSS_CALC,
CSS_CALC_PERCENTAGE_WITH_ANGLE,
CSS_CALC_PERCENTAGE_WITH_LENGTH,
CSS_FONT_FAMILY,
CSS_PROPERTY_ID,
CSS_VALUE_ID,
// This value is used to handle quirky margins in reflow roots (body, td, and th) like WinIE.
// The basic idea is that a stylesheet can use the value __qem (for quirky em) instead of em.
// When the quirky value is used, if you're in quirks mode, the margin will collapse away
// inside a table cell. This quirk is specified in the HTML spec but our impl is different.
CSS_QUIRKY_EM
// Note that CSSValue allocates 7 bits for m_primitiveUnitType, so there can be no value here > 127.
};
enum class CSSUnitCategory : uint8_t {
Number,
Percent,
AbsoluteLength,
FontRelativeLength,
ViewportPercentageLength,
Angle,
Time,
Frequency,
Resolution,
Flex,
Other
};
CSSUnitCategory unitCategory(CSSUnitType);
CSSUnitType canonicalUnitTypeForCategory(CSSUnitCategory);
CSSUnitType canonicalUnitTypeForUnitType(CSSUnitType);
double conversionToCanonicalUnitsScaleFactor(CSSUnitType);
bool conversionToCanonicalUnitRequiresConversionData(CSSUnitType);
WTF::TextStream& operator<<(WTF::TextStream&, CSSUnitCategory);
WTF::TextStream& operator<<(WTF::TextStream&, CSSUnitType);
} // namespace WebCore
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