fontdescription.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2000 Lars Knoll ([e-mail])
 *           (C) 2000 Antti Koivisto ([e-mail])
 *           (C) 2000 Dirk Mueller ([e-mail])
 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 * Copyright (C) 2007 Nicholas Shanks <[e-mail]>
 *
 * 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.LIother.m_  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USm_
 *
 */

#ifndef FontDescription_h
#define FontDescription_h

#include "FontFamily.h"
#include "FontRenderingMode.h"
#include "FontTraitsMask.h"

namespace WebCore {

enum FontWeight {
    FontWeight100,
    FontWeight200,
    FontWeight300,
    FontWeight400,
    FontWeight500,
    FontWeight600,
    FontWeight700,
    FontWeight800,
    FontWeight900,
    FontWeightNormal = FontWeight400,
    FontWeightBold = FontWeight700
};

class FontDescription {
public:
    enum GenericFamilyType { NoFamily, StandardFamily, SerifFamily, SansSerifFamily, 
                             MonospaceFamily, CursiveFamily, FantasyFamily };

    FontDescription()
        : m_specifiedSize(0)
        , m_computedSize(0)
        , m_italic(false)
        , m_smallCaps(false)
        , m_isAbsoluteSize(false)
        , m_weight(FontWeightNormal)
        , m_genericFamily(NoFamily)
        , m_usePrinterFont(false)
        , m_renderingMode(NormalRenderingMode)
        , m_keywordSize(0)
    {
    }

    bool operator==(const FontDescription&) const;
    bool operator!=(const FontDescription& other) const { return !(*this == other); }
    
    const FontFamily& family() const { return m_familyList; }
    FontFamily& firstFamily() { return m_familyList; }
    float specifiedSize() const { return m_specifiedSize; }
    float computedSize() const { return m_computedSize; }
    bool italic() const { return m_italic; }
    int computedPixelSize() const { return int(m_computedSize + 0.5f); }
    bool smallCaps() const { return m_smallCaps; }
    bool isAbsoluteSize() const { return m_isAbsoluteSize; }
    FontWeight weight() const { return static_cast<FontWeight>(m_weight); }
    FontWeight lighterWeight() const;
    FontWeight bolderWeight() const;
    GenericFamilyType genericFamily() const { return static_cast<GenericFamilyType>(m_genericFamily); }
    bool usePrinterFont() const { return m_usePrinterFont; }
    FontRenderingMode renderingMode() const { return static_cast<FontRenderingMode>(m_renderingMode); }
    int keywordSize() const { return m_keywordSize; }

    FontTraitsMask traitsMask() const;

    void setFamily(const FontFamily& family) { m_familyList = family; }
    void setComputedSize(float s) { m_computedSize = s; }
    void setSpecifiedSize(float s) { m_specifiedSize = s; }
    void setItalic(bool i) { m_italic = i; }
    void setSmallCaps(bool c) { m_smallCaps = c; }
    void setIsAbsoluteSize(bool s) { m_isAbsoluteSize = s; }
    void setWeight(FontWeight w) { m_weight = w; }
    void setGenericFamily(GenericFamilyType genericFamily) { m_genericFamily = genericFamily; }
    void setUsePrinterFont(bool p) { m_usePrinterFont = p; }
    void setRenderingMode(FontRenderingMode mode) { m_renderingMode = mode; }
    void setKeywordSize(int s) { m_keywordSize = s; }

private:
    FontFamily m_familyList; // The list of font families to be used.

    float m_specifiedSize;   // Specified CSS value. Independent of rendering issues such as integer
                             // rounding, minimum font sizes, and zooming.
    float m_computedSize;    // Computed size adjusted for the minimum font size and the zoom factor.  

    bool m_italic : 1;
    bool m_smallCaps : 1;
    bool m_isAbsoluteSize : 1;   // Whether or not CSS specified an explicit size
                                 // (logical sizes like "medium" don't count).
    unsigned m_weight : 8; // FontWeight
    unsigned m_genericFamily : 3; // GenericFamilyType
    bool m_usePrinterFont : 1;

    unsigned m_renderingMode : 1;  // Used to switch between CG and GDI text on Windows.

    int m_keywordSize : 4; // We cache whether or not a font is currently represented by a CSS keyword (e.g., medium).  If so,
                           // then we can accurately translate across different generic families to adjust for different preference settings
                           // (e.g., 13px monospace vs. 16px everything else).  Sizes are 1-8 (like the HTML size values for <font>).
};

inline bool FontDescription::operator==(const FontDescription& other) const
{
    return m_familyList == other.m_familyList
        && m_specifiedSize == other.m_specifiedSize
        && m_computedSize == other.m_computedSize
        && m_italic == other.m_italic
        && m_smallCaps == other.m_smallCaps
        && m_isAbsoluteSize == other.m_isAbsoluteSize
        && m_weight == other.m_weight
        && m_genericFamily == other.m_genericFamily
        && m_usePrinterFont == other.m_usePrinterFont
        && m_renderingMode == other.m_renderingMode
        && m_keywordSize == other.m_keywordSize;
}

}

#endif