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* Copyright (C) 2000 Lars Knoll (
* (C) 2000 Antti Koivisto (
* (C) 2000 Dirk Mueller (
* Copyright (C) 2003, 2006, 2007, 2010, 2011 Apple Inc. All rights reserved.
* 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
* 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 "platform/PlatformExport.h"
#include "platform/fonts/FontDescription.h"
#include "platform/fonts/FontFallbackList.h"
#include "platform/fonts/SimpleFontData.h"
#include "platform/fonts/TextBlob.h"
#include "platform/text/TextDirection.h"
#include "platform/text/TextPath.h"
#include "wtf/HashMap.h"
#include "wtf/HashSet.h"
#include "wtf/MathExtras.h"
#include "wtf/unicode/CharacterNames.h"
// "X11/X.h" defines Complex to 0 and conflicts
// with Complex value in CodePath enum.
#ifdef Complex
#undef Complex
class SkTextBlob;
struct SkPoint;
namespace blink {
class FloatPoint;
class FloatRect;
class FontData;
class FontMetrics;
class FontSelector;
class GlyphBuffer;
class GraphicsContext;
class TextRun;
struct TextRunPaintInfo;
struct GlyphData;
struct GlyphOverflow {
: left(0)
, right(0)
, top(0)
, bottom(0)
, computeBounds(false)
bool isZero() const
return !left && !right && !top && !bottom;
int left;
int right;
int top;
int bottom;
bool computeBounds;
Font(const FontDescription&);
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; }
void update(PassRefPtrWillBeRawPtr<FontSelector>) const;
enum CustomFontNotReadyAction { DoNotPaintIfFontNotReady, UseFallbackIfFontNotReady };
void drawText(GraphicsContext*, const TextRunPaintInfo&, const FloatPoint&) const;
float drawUncachedText(GraphicsContext*, const TextRunPaintInfo&, const FloatPoint&,
CustomFontNotReadyAction) const;
void drawEmphasisMarks(GraphicsContext*, const TextRunPaintInfo&, const AtomicString& mark, const FloatPoint&) const;
float width(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
int offsetForPosition(const TextRun&, float position, bool includePartialGlyphs) const;
FloatRect selectionRectForText(const TextRun&, const FloatPoint&, int h, int from = 0, int to = -1, bool accountForGlyphBounds = false) const;
bool isFixedPitch() const;
// Metrics that we query the FontFallbackList for.
const FontMetrics& fontMetrics() const { return primaryFont()->fontMetrics(); }
float spaceWidth() const { return primaryFont()->spaceWidth() + fontDescription().letterSpacing(); }
float tabWidth(const SimpleFontData&, unsigned tabSize, float position) const;
float tabWidth(unsigned tabSize, float position) const { return tabWidth(*primaryFont(), tabSize, position); }
int emphasisMarkAscent(const AtomicString&) const;
int emphasisMarkDescent(const AtomicString&) const;
int emphasisMarkHeight(const AtomicString&) const;
const SimpleFontData* primaryFont() const;
const FontData* fontDataAt(unsigned) const;
inline GlyphData glyphDataForCharacter(UChar32& c, bool mirror, bool spaceNormalize = false, FontDataVariant variant = AutoVariant) const
return glyphDataAndPageForCharacter(c, mirror, spaceNormalize, variant).first;
std::pair<GlyphData, GlyphPage*> glyphDataAndPageForCharacter(UChar32&, bool mirror, bool normalizeSpace = false, FontDataVariant = AutoVariant) const;
bool primaryFontHasGlyphForCharacter(UChar32) const;
CodePath codePath(const TextRunPaintInfo&) const;
enum ForTextEmphasisOrNot { NotForTextEmphasis, ForTextEmphasis };
// Returns the initial in-stream advance.
float buildGlyphBuffer(const TextRunPaintInfo&, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const;
PassTextBlobPtr buildTextBlob(const GlyphBuffer&, float initialAdvance, const FloatRect& bounds,
bool couldUseLCD) const;
SkPaint textFillPaint(GraphicsContext*, const SimpleFontData*) const;
SkPaint textStrokePaint(GraphicsContext*, const SimpleFontData*, bool isFilling) const;
void paintGlyphs(GraphicsContext*, const SimpleFontData*, const Glyph glyphs[], unsigned numGlyphs,
const SkPoint pos[], const FloatRect& textRect) const;
void paintGlyphsHorizontal(GraphicsContext*, const SimpleFontData*, const Glyph glyphs[], unsigned numGlyphs,
const SkScalar xpos[], SkScalar constY, const FloatRect& textRect) const;
void drawGlyphs(GraphicsContext*, const SimpleFontData*, const GlyphBuffer&, unsigned from, unsigned numGlyphs, const FloatPoint&, const FloatRect& textRect) const;
void drawTextBlob(GraphicsContext*, const SkTextBlob*, const SkPoint& origin) const;
float drawGlyphBuffer(GraphicsContext*, const TextRunPaintInfo&, const GlyphBuffer&, const FloatPoint&) const;
void drawEmphasisMarks(GraphicsContext*, const TextRunPaintInfo&, const GlyphBuffer&, const AtomicString&, const FloatPoint&) const;
float floatWidthForSimpleText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, IntRectExtent* glyphBounds = 0) const;
int offsetForPositionForSimpleText(const TextRun&, float position, bool includePartialGlyphs) const;
FloatRect selectionRectForSimpleText(const TextRun&, const FloatPoint&, int h, int from, int to, bool accountForGlyphBounds) const;
bool getEmphasisMarkGlyphData(const AtomicString&, GlyphData&) const;
float floatWidthForComplexText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts, IntRectExtent* glyphBounds) const;
int offsetForPositionForComplexText(const TextRun&, float position, bool includePartialGlyphs) const;
FloatRect selectionRectForComplexText(const TextRun&, const FloatPoint&, int h, int from, int to) const;
friend struct SimpleShaper;
FontSelector* fontSelector() const;
FontFallbackList* fontList() const { return m_fontFallbackList.get(); }
void willUseFontData(UChar32) const;
bool loadingCustomFonts() const
return m_fontFallbackList && m_fontFallbackList->loadingCustomFonts();
bool shouldSkipDrawing() const
return m_fontFallbackList && m_fontFallbackList->shouldSkipDrawing();
FontDescription m_fontDescription;
mutable RefPtr<FontFallbackList> m_fontFallbackList;
inline Font::~Font()
inline const SimpleFontData* Font::primaryFont() const
return m_fontFallbackList->primarySimpleFontData(m_fontDescription);
inline const FontData* Font::fontDataAt(unsigned index) const
return m_fontFallbackList->fontDataAt(m_fontDescription, index);
inline bool Font::isFixedPitch() const
return m_fontFallbackList->isFixedPitch(m_fontDescription);
inline FontSelector* Font::fontSelector() const
return m_fontFallbackList ? m_fontFallbackList->fontSelector() : 0;
inline float Font::tabWidth(const SimpleFontData& fontData, unsigned tabSize, float position) const
if (!tabSize)
return fontDescription().letterSpacing();
float tabWidth = tabSize * fontData.spaceWidth() + fontDescription().letterSpacing();
return tabWidth - fmodf(position, tabWidth);
} // namespace blink