Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 287 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/Font.h b/Source/WebCore/platform/graphics/Font.h
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+++ b/Source/WebCore/platform/graphics/Font.h
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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, 2010 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
+ * 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 "FontDescription.h"
+#include "FontFallbackList.h"
+#include "SimpleFontData.h"
+#include "TextRun.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 SVGFontElement;
+
+struct GlyphData;
+
+const unsigned defaultUnitsPerEm = 1000;
+
+struct GlyphOverflow {
+    GlyphOverflow()
+        : left(0)
+        , right(0)
+        , top(0)
+        , bottom(0)
+    {
+    }
+
+    int left;
+    int right;
+    int top;
+    int bottom;
+};
+
+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, FontSmoothingMode = AutoSmoothing);
+    ~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;
+    void drawEmphasisMarks(GraphicsContext*, const TextRun&, const AtomicString& mark, const FloatPoint&, int from = 0, int to = -1) const;
+
+    int width(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* glyphOverflow = 0) const { return lroundf(floatWidth(run, fallbackFonts, glyphOverflow)); }
+    float floatWidth(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* glyphOverflow = 0) const;
+    float floatWidth(const TextRun& run, int extraCharsAvailable, int& charsConsumed, String& glyphName) const;
+
+    int offsetForPosition(const TextRun&, float position, bool includePartialGlyphs) const;
+    FloatRect selectionRectForText(const TextRun&, const FloatPoint&, 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(FontBaseline baselineType = AlphabeticBaseline) const { return primaryFont()->ascent(baselineType); }
+    int descent(FontBaseline baselineType = AlphabeticBaseline) const { return primaryFont()->descent(baselineType); }
+    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); }
+    float tabWidth(const SimpleFontData& fontData) const { return 8 * ceilf(fontData.adjustedSpaceWidth() + letterSpacing()); }
+    int emphasisMarkAscent(const AtomicString&) const;
+    int emphasisMarkDescent(const AtomicString&) const;
+    int emphasisMarkHeight(const AtomicString&) const;
+
+    const SimpleFontData* primaryFont() const;
+    const FontData* fontDataAt(unsigned) const;
+    GlyphData glyphDataForCharacter(UChar32, bool mirror, FontDataVariant = AutoVariant) const;
+    bool primaryFontHasGlyphForCharacter(UChar32) const;
+    // Used for complex text, and does not utilize the glyph map cache.
+    const FontData* fontDataForCharacters(const UChar*, int length) const;
+
+    static bool isCJKIdeograph(UChar32);
+    static bool isCJKIdeographOrSymbol(UChar32);
+    
+#if PLATFORM(QT)
+    QFont font() const;
+#endif
+
+    static void setShouldUseSmoothing(bool);
+    static bool shouldUseSmoothing();
+
+    enum CodePath { Auto, Simple, Complex, SimpleWithGlyphOverflow };
+
+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 FloatPoint&, int h, int from, int to) const;
+    int offsetForPositionForTextUsingSVGFont(const TextRun&, float position, bool includePartialGlyphs) const;
+#endif
+
+    enum ForTextEmphasisOrNot { NotForTextEmphasis, ForTextEmphasis };
+
+    // Returns the initial in-stream advance.
+    float getGlyphsAndAdvancesForSimpleText(const TextRun&, int from, int to, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const;
+    void drawSimpleText(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const;
+    void drawEmphasisMarksForSimpleText(GraphicsContext*, const TextRun&, const AtomicString& mark, 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 FloatPoint&) const;
+    void drawEmphasisMarks(GraphicsContext* context, const GlyphBuffer&, const AtomicString&, const FloatPoint&) const;
+    float floatWidthForSimpleText(const TextRun&, GlyphBuffer*, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
+    int offsetForPositionForSimpleText(const TextRun&, float position, bool includePartialGlyphs) const;
+    FloatRect selectionRectForSimpleText(const TextRun&, const FloatPoint&, int h, int from, int to) const;
+
+    bool getEmphasisMarkGlyphData(const AtomicString&, GlyphData&) const;
+
+    static bool canReturnFallbackFontsForComplexText();
+
+    CodePath codePath(const TextRun&) const;
+
+    // Returns the initial in-stream advance.
+    float getGlyphsAndAdvancesForComplexText(const TextRun&, int from, int to, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const;
+    void drawComplexText(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const;
+    void drawEmphasisMarksForComplexText(GraphicsContext*, const TextRun&, const AtomicString& mark, const FloatPoint&, int from, int to) const;
+    float floatWidthForComplexText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) 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 WidthIterator;
+
+public:
+    // Useful for debugging the different font rendering code paths.
+    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]));
+    }
+
+    FontSelector* fontSelector() const;
+    static bool treatAsSpace(UChar c) { return c == ' ' || c == '\t' || c == '\n' || c == noBreakSpace; }
+    static bool treatAsZeroWidthSpace(UChar c) { return c < 0x20 || (c >= 0x7F && c < 0xA0) || c == softHyphen || (c >= 0x200c && c <= 0x200f) || (c >= 0x202a && c <= 0x202e) || c == objectReplacementCharacter; }
+    static bool canReceiveTextEmphasis(UChar32 c);
+
+    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
+
+    bool needsTranscoding() const { return m_needsTranscoding; }
+
+private:
+    bool loadingCustomFonts() const
+    {
+        return m_fontList && m_fontList->loadingCustomFonts();
+    }
+
+    FontDescription m_fontDescription;
+    mutable RefPtr<FontFallbackList> m_fontList;
+    short m_letterSpacing;
+    short m_wordSpacing;
+    bool m_isPlatformFont;
+    bool m_needsTranscoding;
+};
+
+inline Font::~Font()
+{
+}
+
+inline const SimpleFontData* Font::primaryFont() const
+{
+    ASSERT(m_fontList);
+    return m_fontList->primarySimpleFontData(this);
+}
+
+inline const FontData* Font::fontDataAt(unsigned index) const
+{
+    ASSERT(m_fontList);
+    return m_fontList->fontDataAt(this, index);
+}
+
+inline const FontData* Font::fontDataForCharacters(const UChar* characters, int length) const
+{
+    ASSERT(m_fontList);
+    return m_fontList->fontDataForCharacters(this, characters, length);
+}
+
+inline bool Font::isFixedPitch() const
+{
+    ASSERT(m_fontList);
+    return m_fontList->isFixedPitch(this);
+}
+
+inline FontSelector* Font::fontSelector() const
+{
+    return m_fontList ? m_fontList->fontSelector() : 0;
+}
+
+}
+
+#endif