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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* (C) 2000 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003, 2006, 2007 Apple Computer, Inc.
* Copyright (C) 2008 Holger Hans Peter Freyther
*
* 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 Font_h
#define Font_h
#include "CharacterNames.h"
#include "TextRun.h"
#include "FontDescription.h"
#include "SimpleFontData.h"
#include "TypesettingFeatures.h"
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/MathExtras.h>
#if PLATFORM(QT)
#include <QFont>
#endif
namespace WebCore {
class FloatPoint;
class FloatRect;
class FontData;
class FontFallbackList;
class FontPlatformData;
class FontSelector;
class GlyphBuffer;
class GlyphPageTreeNode;
class GraphicsContext;
class IntPoint;
class SVGFontElement;
struct GlyphData;
const unsigned defaultUnitsPerEm = 1000;
class Font {
public:
Font();
Font(const FontDescription&, short letterSpacing, short wordSpacing);
// This constructor is only used if the platform wants to start with a native font.
Font(const FontPlatformData&, bool isPrinting);
~Font();
Font(const Font&);
Font& operator=(const Font&);
bool operator==(const Font& other) const;
bool operator!=(const Font& other) const {
return !(*this == other);
}
const FontDescription& fontDescription() const { return m_fontDescription; }
int pixelSize() const { return fontDescription().computedPixelSize(); }
float size() const { return fontDescription().computedSize(); }
void update(PassRefPtr<FontSelector>) const;
void drawText(GraphicsContext*, const TextRun&, const FloatPoint&, int from = 0, int to = -1) const;
int width(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts = 0) const { return lroundf(floatWidth(run, fallbackFonts)); }
float floatWidth(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0) const;
float floatWidth(const TextRun& run, int extraCharsAvailable, int& charsConsumed, String& glyphName) const;
int offsetForPosition(const TextRun&, int position, bool includePartialGlyphs) const;
FloatRect selectionRectForText(const TextRun&, const IntPoint&, int h, int from = 0, int to = -1) const;
bool isSmallCaps() const { return m_fontDescription.smallCaps(); }
short wordSpacing() const { return m_wordSpacing; }
short letterSpacing() const { return m_letterSpacing; }
void setWordSpacing(short s) { m_wordSpacing = s; }
void setLetterSpacing(short s) { m_letterSpacing = s; }
bool isFixedPitch() const;
bool isPrinterFont() const { return m_fontDescription.usePrinterFont(); }
FontRenderingMode renderingMode() const { return m_fontDescription.renderingMode(); }
TypesettingFeatures typesettingFeatures() const
{
TextRenderingMode textRenderingMode = m_fontDescription.textRenderingMode();
return textRenderingMode == OptimizeLegibility || textRenderingMode == GeometricPrecision ? Kerning | Ligatures : 0;
}
FontFamily& firstFamily() { return m_fontDescription.firstFamily(); }
const FontFamily& family() const { return m_fontDescription.family(); }
bool italic() const { return m_fontDescription.italic(); }
FontWeight weight() const { return m_fontDescription.weight(); }
bool isPlatformFont() const { return m_isPlatformFont; }
// Metrics that we query the FontFallbackList for.
int ascent() const { return primaryFont()->ascent(); }
int descent() const { return primaryFont()->descent(); }
int height() const { return ascent() + descent(); }
int lineSpacing() const { return primaryFont()->lineSpacing(); }
int lineGap() const { return primaryFont()->lineGap(); }
float xHeight() const { return primaryFont()->xHeight(); }
unsigned unitsPerEm() const { return primaryFont()->unitsPerEm(); }
int spaceWidth() const { return (int)ceilf(primaryFont()->adjustedSpaceWidth() + m_letterSpacing); }
int tabWidth() const { return 8 * spaceWidth(); }
const SimpleFontData* primaryFont() const;
const FontData* fontDataAt(unsigned) const;
GlyphData glyphDataForCharacter(UChar32, bool mirror, bool forceSmallCaps = false) const;
// Used for complex text, and does not utilize the glyph map cache.
const FontData* fontDataForCharacters(const UChar*, int length) const;
#if PLATFORM(QT)
QFont font() const;
#endif
static void setShouldUseSmoothing(bool);
static bool shouldUseSmoothing();
private:
#if ENABLE(SVG_FONTS)
void drawTextUsingSVGFont(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const;
float floatWidthUsingSVGFont(const TextRun&) const;
float floatWidthUsingSVGFont(const TextRun&, int extraCharsAvailable, int& charsConsumed, String& glyphName) const;
FloatRect selectionRectForTextUsingSVGFont(const TextRun&, const IntPoint&, int h, int from, int to) const;
int offsetForPositionForTextUsingSVGFont(const TextRun&, int position, bool includePartialGlyphs) const;
#endif
#if USE(FONT_FAST_PATH)
bool canUseGlyphCache(const TextRun&) const;
void drawSimpleText(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const;
void drawGlyphs(GraphicsContext*, const SimpleFontData*, const GlyphBuffer&, int from, int to, const FloatPoint&) const;
void drawGlyphBuffer(GraphicsContext*, const GlyphBuffer&, const TextRun&, const FloatPoint&) const;
float floatWidthForSimpleText(const TextRun&, GlyphBuffer*, HashSet<const SimpleFontData*>* fallbackFonts = 0) const;
int offsetForPositionForSimpleText(const TextRun&, int position, bool includePartialGlyphs) const;
FloatRect selectionRectForSimpleText(const TextRun&, const IntPoint&, int h, int from, int to) const;
static bool canReturnFallbackFontsForComplexText();
#endif
void drawComplexText(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const;
float floatWidthForComplexText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0) const;
int offsetForPositionForComplexText(const TextRun&, int position, bool includePartialGlyphs) const;
FloatRect selectionRectForComplexText(const TextRun&, const IntPoint&, int h, int from, int to) const;
friend struct WidthIterator;
public:
// Useful for debugging the different font rendering code paths.
#if USE(FONT_FAST_PATH)
enum CodePath { Auto, Simple, Complex };
static void setCodePath(CodePath);
static CodePath codePath();
static CodePath s_codePath;
static const uint8_t gRoundingHackCharacterTable[256];
static bool isRoundingHackCharacter(UChar32 c)
{
return (((c & ~0xFF) == 0 && gRoundingHackCharacterTable[c]));
}
#endif
FontSelector* fontSelector() const;
static bool treatAsSpace(UChar c) { return c == ' ' || c == '\t' || c == '\n' || c == 0x00A0; }
static bool treatAsZeroWidthSpace(UChar c) { return c < 0x20 || (c >= 0x7F && c < 0xA0) || c == 0x200e || c == 0x200f || (c >= 0x202a && c <= 0x202e) || c == 0xFFFC; }
static inline UChar normalizeSpaces(UChar character)
{
if (treatAsSpace(character))
return space;
if (treatAsZeroWidthSpace(character))
return zeroWidthSpace;
return character;
}
static String normalizeSpaces(const String&);
#if ENABLE(SVG_FONTS)
bool isSVGFont() const;
SVGFontElement* svgFont() const;
#endif
private:
FontDescription m_fontDescription;
mutable RefPtr<FontFallbackList> m_fontList;
short m_letterSpacing;
short m_wordSpacing;
bool m_isPlatformFont;
};
}
#endif
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