Source/WebCore/platform/graphics/SimpleFontData.h

/*
 * This file is part of the internal font implementation.
 *
 * Copyright (C) 2006, 2008, 2010 Apple Inc. All rights reserved.
 * Copyright (C) 2007-2008 Torch Mobile, Inc.
 *
 * 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.
 *
 */

#ifndef SimpleFontData_h
#define SimpleFontData_h

#include "FontBaseline.h"
#include "FontData.h"
#include "FontMetrics.h"
#include "FontPlatformData.h"
#include "FloatRect.h"
#include "GlyphMetricsMap.h"
#include "GlyphPageTreeNode.h"
#if ENABLE(OPENTYPE_VERTICAL)
#include "OpenTypeVerticalData.h"
#endif
#include "TypesettingFeatures.h"
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/text/StringHash.h>

#if PLATFORM(MAC) || (PLATFORM(CHROMIUM) && OS(DARWIN)) || (PLATFORM(WX) && OS(DARWIN))
#include <wtf/RetainPtr.h>
#endif

#if (PLATFORM(WIN) && !OS(WINCE)) \
    || (OS(WINDOWS) && PLATFORM(WX))
#include <usp10.h>
#endif

#if USE(CAIRO)
#include <cairo.h>
#endif

#if PLATFORM(QT)
#include <QRawFont>
#endif

namespace WebCore {

class FontDescription;
class SharedBuffer;
struct WidthIterator;

enum FontDataVariant { AutoVariant, NormalVariant, SmallCapsVariant, EmphasisMarkVariant, BrokenIdeographVariant };
enum Pitch { UnknownPitch, FixedPitch, VariablePitch };

class SimpleFontData : public FontData {
public:
    class AdditionalFontData {
        WTF_MAKE_FAST_ALLOCATED;
    public:
        virtual ~AdditionalFontData() { }

        virtual void initializeFontData(SimpleFontData*, float fontSize) = 0;
        virtual float widthForSVGGlyph(Glyph, float fontSize) const = 0;
        virtual bool fillSVGGlyphPage(GlyphPage*, unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength, const SimpleFontData*) const = 0;
        virtual bool applySVGGlyphSelection(WidthIterator&, GlyphData&, bool mirror, int currentCharacter, unsigned& advanceLength) const = 0;
    };

    // Used to create platform fonts.
    SimpleFontData(const FontPlatformData&, bool isCustomFont = false, bool isLoading = false, bool isTextOrientationFallback = false);

    // Used to create SVG Fonts.
    SimpleFontData(PassOwnPtr<AdditionalFontData>, float fontSize, bool syntheticBold, bool syntheticItalic);

    virtual ~SimpleFontData();

    const FontPlatformData& platformData() const { return m_platformData; }
#if ENABLE(OPENTYPE_VERTICAL)
    const OpenTypeVerticalData* verticalData() const { return 0; } // FIXME: implement
#endif

    SimpleFontData* smallCapsFontData(const FontDescription&) const;
    SimpleFontData* emphasisMarkFontData(const FontDescription&) const;
    SimpleFontData* brokenIdeographFontData() const;

    SimpleFontData* variantFontData(const FontDescription& description, FontDataVariant variant) const
    {
        switch (variant) {
        case SmallCapsVariant:
            return smallCapsFontData(description);
        case EmphasisMarkVariant:
            return emphasisMarkFontData(description);
        case BrokenIdeographVariant:
            return brokenIdeographFontData();
        case AutoVariant:
        case NormalVariant:
            break;
        }
        ASSERT_NOT_REACHED();
        return const_cast<SimpleFontData*>(this);
    }

    SimpleFontData* verticalRightOrientationFontData() const;
    SimpleFontData* uprightOrientationFontData() const;

    bool hasVerticalGlyphs() const { return m_hasVerticalGlyphs; }
    bool isTextOrientationFallback() const { return m_isTextOrientationFallback; }

    FontMetrics& fontMetrics() { return m_fontMetrics; }
    const FontMetrics& fontMetrics() const { return m_fontMetrics; }
    float sizePerUnit() const { return platformData().size() / (fontMetrics().unitsPerEm() ? fontMetrics().unitsPerEm() : 1); }
    
    float maxCharWidth() const { return m_maxCharWidth; }
    void setMaxCharWidth(float maxCharWidth) { m_maxCharWidth = maxCharWidth; }

    float avgCharWidth() const { return m_avgCharWidth; }
    void setAvgCharWidth(float avgCharWidth) { m_avgCharWidth = avgCharWidth; }

    FloatRect boundsForGlyph(Glyph) const;
    float widthForGlyph(Glyph glyph) const;
    FloatRect platformBoundsForGlyph(Glyph) const;
    float platformWidthForGlyph(Glyph) const;

    float spaceWidth() const { return m_spaceWidth; }
    float adjustedSpaceWidth() const { return m_adjustedSpaceWidth; }
    void setSpaceWidth(float spaceWidth) { m_spaceWidth = spaceWidth; }

#if USE(CG) || USE(CAIRO) || PLATFORM(WX) || USE(SKIA_ON_MAC_CHROMIUM)
    float syntheticBoldOffset() const { return m_syntheticBoldOffset; }
#endif

    Glyph spaceGlyph() const { return m_spaceGlyph; }
    void setSpaceGlyph(Glyph spaceGlyph) { m_spaceGlyph = spaceGlyph; }
    void setZeroWidthSpaceGlyph(Glyph spaceGlyph) { m_zeroWidthSpaceGlyph = spaceGlyph; }
    bool isZeroWidthSpaceGlyph(Glyph glyph) const { return glyph == m_zeroWidthSpaceGlyph && glyph; }

    virtual const SimpleFontData* fontDataForCharacter(UChar32) const;
    virtual bool containsCharacters(const UChar*, int length) const;

    Glyph glyphForCharacter(UChar32) const;

    void determinePitch();
    Pitch pitch() const { return m_treatAsFixedPitch ? FixedPitch : VariablePitch; }

    AdditionalFontData* fontData() const { return m_fontData.get(); }
    bool isSVGFont() const { return m_fontData; }

    virtual bool isCustomFont() const { return m_isCustomFont; }
    virtual bool isLoading() const { return m_isLoading; }
    virtual bool isSegmented() const;

    const GlyphData& missingGlyphData() const { return m_missingGlyphData; }
    void setMissingGlyphData(const GlyphData& glyphData) { m_missingGlyphData = glyphData; }

#ifndef NDEBUG
    virtual String description() const;
#endif

#if PLATFORM(MAC) || (PLATFORM(CHROMIUM) && OS(DARWIN))
    const SimpleFontData* getCompositeFontReferenceFontData(NSFont *key) const;
    NSFont* getNSFont() const { return m_platformData.font(); }
#elif (PLATFORM(WX) && OS(DARWIN)) 
    const SimpleFontData* getCompositeFontReferenceFontData(NSFont *key) const;
    NSFont* getNSFont() const { return m_platformData.nsFont(); }
#endif

#if PLATFORM(MAC) || (PLATFORM(CHROMIUM) && OS(DARWIN)) || (PLATFORM(WX) && OS(DARWIN))
    CFDictionaryRef getCFStringAttributes(TypesettingFeatures, FontOrientation) const;
    bool canRenderCombiningCharacterSequence(const UChar*, size_t) const;
#endif

#if PLATFORM(QT)
    QRawFont getQtRawFont() const { return m_platformData.rawFont(); }
#endif

#if PLATFORM(WIN) || (OS(WINDOWS) && PLATFORM(WX))
    bool isSystemFont() const { return m_isSystemFont; }
#if !OS(WINCE) // disable unused members to save space
    SCRIPT_FONTPROPERTIES* scriptFontProperties() const;
    SCRIPT_CACHE* scriptCache() const { return &m_scriptCache; }
#endif
    static void setShouldApplyMacAscentHack(bool);
    static bool shouldApplyMacAscentHack();
    static float ascentConsideringMacAscentHack(const WCHAR*, float ascent, float descent);
#endif

#if PLATFORM(WX)
    wxFont* getWxFont() const { return m_platformData.font(); }
#endif

private:
    void platformInit();
    void platformGlyphInit();
    void platformCharWidthInit();
    void platformDestroy();
    
    void initCharWidths();

    void commonInit();

    PassOwnPtr<SimpleFontData> createScaledFontData(const FontDescription&, float scaleFactor) const;

#if (PLATFORM(WIN) && !OS(WINCE)) \
    || (OS(WINDOWS) && PLATFORM(WX))
    void initGDIFont();
    void platformCommonDestroy();
    FloatRect boundsForGDIGlyph(Glyph glyph) const;
    float widthForGDIGlyph(Glyph glyph) const;
#endif

    FontMetrics m_fontMetrics;
    float m_maxCharWidth;
    float m_avgCharWidth;
    
    FontPlatformData m_platformData;
    OwnPtr<AdditionalFontData> m_fontData;

    mutable OwnPtr<GlyphMetricsMap<FloatRect> > m_glyphToBoundsMap;
    mutable GlyphMetricsMap<float> m_glyphToWidthMap;

    bool m_treatAsFixedPitch;
    bool m_isCustomFont;  // Whether or not we are custom font loaded via @font-face
    bool m_isLoading; // Whether or not this custom font is still in the act of loading.
    
    bool m_isTextOrientationFallback;
    bool m_isBrokenIdeographFallback;
    bool m_hasVerticalGlyphs;
    
    Glyph m_spaceGlyph;
    float m_spaceWidth;
    float m_adjustedSpaceWidth;

    Glyph m_zeroWidthSpaceGlyph;

    GlyphData m_missingGlyphData;

    struct DerivedFontData {
        static PassOwnPtr<DerivedFontData> create(bool forCustomFont);
        ~DerivedFontData();

        bool forCustomFont;
        OwnPtr<SimpleFontData> smallCaps;
        OwnPtr<SimpleFontData> emphasisMark;
        OwnPtr<SimpleFontData> brokenIdeograph;
        OwnPtr<SimpleFontData> verticalRightOrientation;
        OwnPtr<SimpleFontData> uprightOrientation;
#if PLATFORM(MAC) || (PLATFORM(CHROMIUM) && OS(DARWIN))
        mutable RetainPtr<CFMutableDictionaryRef> compositeFontReferences;
#endif
        
    private:
        DerivedFontData(bool custom)
            : forCustomFont(custom)
        {
        }
    };

    mutable OwnPtr<DerivedFontData> m_derivedFontData;

#if USE(CG) || USE(CAIRO) || PLATFORM(WX) || USE(SKIA_ON_MAC_CHROMIUM)
    float m_syntheticBoldOffset;
#endif

#if PLATFORM(MAC) || (PLATFORM(CHROMIUM) && OS(DARWIN)) || (PLATFORM(WX) && OS(DARWIN))
    mutable HashMap<unsigned, RetainPtr<CFDictionaryRef> > m_CFStringAttributes;
    mutable OwnPtr<HashMap<String, bool> > m_combiningCharacterSequenceSupport;
#endif

#if PLATFORM(WIN) || (OS(WINDOWS) && PLATFORM(WX))
    bool m_isSystemFont;
#if !OS(WINCE) // disable unused members to save space
    mutable SCRIPT_CACHE m_scriptCache;
    mutable SCRIPT_FONTPROPERTIES* m_scriptFontProperties;
#endif
#endif
};

ALWAYS_INLINE FloatRect SimpleFontData::boundsForGlyph(Glyph glyph) const
{
    if (isZeroWidthSpaceGlyph(glyph))
        return FloatRect();

    FloatRect bounds;
    if (m_glyphToBoundsMap) {
        bounds = m_glyphToBoundsMap->metricsForGlyph(glyph);
        if (bounds.width() != cGlyphSizeUnknown)
            return bounds;
    }

    bounds = platformBoundsForGlyph(glyph);
    if (!m_glyphToBoundsMap)
        m_glyphToBoundsMap = adoptPtr(new GlyphMetricsMap<FloatRect>);
    m_glyphToBoundsMap->setMetricsForGlyph(glyph, bounds);
    return bounds;
}

ALWAYS_INLINE float SimpleFontData::widthForGlyph(Glyph glyph) const
{
    if (isZeroWidthSpaceGlyph(glyph))
        return 0;

    float width = m_glyphToWidthMap.metricsForGlyph(glyph);
    if (width != cGlyphSizeUnknown)
        return width;

    if (m_fontData)
        width = m_fontData->widthForSVGGlyph(glyph, m_platformData.size());
    else
        width = platformWidthForGlyph(glyph);

    m_glyphToWidthMap.setMetricsForGlyph(glyph, width);
    return width;
}

} // namespace WebCore

#endif // SimpleFontData_h