1 /*
2 * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
3 * (C) 2000 Antti Koivisto (koivisto@kde.org)
4 * (C) 2000 Dirk Mueller (mueller@kde.org)
5 * Copyright (C) 2003, 2006, 2007, 2010, 2011 Apple Inc. All rights reserved.
6 * Copyright (C) 2008 Holger Hans Peter Freyther
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB. If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 *
23 */
24
25 #ifndef Font_h
26 #define Font_h
27
28 #include "platform/PlatformExport.h"
29 #include "platform/fonts/FontDescription.h"
30 #include "platform/fonts/FontFallbackList.h"
31 #include "platform/fonts/SimpleFontData.h"
32 #include "platform/text/TextDirection.h"
33 #include "platform/text/TextPath.h"
34 #include "wtf/HashMap.h"
35 #include "wtf/HashSet.h"
36 #include "wtf/MathExtras.h"
37 #include "wtf/unicode/CharacterNames.h"
38
39 // "X11/X.h" defines Complex to 0 and conflicts
40 // with Complex value in CodePath enum.
41 #ifdef Complex
42 #undef Complex
43 #endif
44
45 namespace WebCore {
46
47 class FloatPoint;
48 class FloatRect;
49 class FontData;
50 class FontMetrics;
51 class FontPlatformData;
52 class FontSelector;
53 class GlyphBuffer;
54 class GraphicsContext;
55 class TextRun;
56 struct TextRunPaintInfo;
57
58 struct GlyphData;
59
60 struct GlyphOverflow {
GlyphOverflowGlyphOverflow61 GlyphOverflow()
62 : left(0)
63 , right(0)
64 , top(0)
65 , bottom(0)
66 , computeBounds(false)
67 {
68 }
69
70 int left;
71 int right;
72 int top;
73 int bottom;
74 bool computeBounds;
75 };
76
77
78 class PLATFORM_EXPORT Font {
79 public:
80 Font();
81 Font(const FontDescription&);
82 ~Font();
83
84 Font(const Font&);
85 Font& operator=(const Font&);
86
87 bool operator==(const Font& other) const;
88 bool operator!=(const Font& other) const { return !(*this == other); }
89
fontDescription()90 const FontDescription& fontDescription() const { return m_fontDescription; }
91
92 void update(PassRefPtrWillBeRawPtr<FontSelector>) const;
93
94 enum CustomFontNotReadyAction { DoNotPaintIfFontNotReady, UseFallbackIfFontNotReady };
95 void drawText(GraphicsContext*, const TextRunPaintInfo&, const FloatPoint&, CustomFontNotReadyAction = DoNotPaintIfFontNotReady) const;
96 void drawEmphasisMarks(GraphicsContext*, const TextRunPaintInfo&, const AtomicString& mark, const FloatPoint&) const;
97
98 float width(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
99 float width(const TextRun&, int& charsConsumed, Glyph& glyphId) const;
100
101 int offsetForPosition(const TextRun&, float position, bool includePartialGlyphs) const;
102 FloatRect selectionRectForText(const TextRun&, const FloatPoint&, int h, int from = 0, int to = -1, bool accountForGlyphBounds = false) const;
103
104 bool isFixedPitch() const;
105
106 // Metrics that we query the FontFallbackList for.
fontMetrics()107 const FontMetrics& fontMetrics() const { return primaryFont()->fontMetrics(); }
spaceWidth()108 float spaceWidth() const { return primaryFont()->spaceWidth() + fontDescription().letterSpacing(); }
109 float tabWidth(const SimpleFontData&, unsigned tabSize, float position) const;
tabWidth(unsigned tabSize,float position)110 float tabWidth(unsigned tabSize, float position) const { return tabWidth(*primaryFont(), tabSize, position); }
111
112 int emphasisMarkAscent(const AtomicString&) const;
113 int emphasisMarkDescent(const AtomicString&) const;
114 int emphasisMarkHeight(const AtomicString&) const;
115
116 const SimpleFontData* primaryFont() const;
117 const FontData* fontDataAt(unsigned) const;
118 inline GlyphData glyphDataForCharacter(UChar32 c, bool mirror, FontDataVariant variant = AutoVariant) const
119 {
120 return glyphDataAndPageForCharacter(c, mirror, variant).first;
121 }
122 #if OS(MACOSX)
123 const SimpleFontData* fontDataForCombiningCharacterSequence(const UChar*, size_t length, FontDataVariant) const;
124 #endif
125 std::pair<GlyphData, GlyphPage*> glyphDataAndPageForCharacter(UChar32, bool mirror, FontDataVariant = AutoVariant) const;
126 bool primaryFontHasGlyphForCharacter(UChar32) const;
127
128 CodePath codePath(const TextRun&) const;
129
130 private:
131 enum ForTextEmphasisOrNot { NotForTextEmphasis, ForTextEmphasis };
132
133 // Returns the initial in-stream advance.
134 float getGlyphsAndAdvancesForSimpleText(const TextRunPaintInfo&, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const;
135 void drawSimpleText(GraphicsContext*, const TextRunPaintInfo&, const FloatPoint&) const;
136 void drawEmphasisMarksForSimpleText(GraphicsContext*, const TextRunPaintInfo&, const AtomicString& mark, const FloatPoint&) const;
137 void drawGlyphs(GraphicsContext*, const SimpleFontData*, const GlyphBuffer&, unsigned from, unsigned numGlyphs, const FloatPoint&, const FloatRect& textRect) const;
138 void drawGlyphBuffer(GraphicsContext*, const TextRunPaintInfo&, const GlyphBuffer&, const FloatPoint&) const;
139 void drawEmphasisMarks(GraphicsContext*, const TextRunPaintInfo&, const GlyphBuffer&, const AtomicString&, const FloatPoint&) const;
140 float floatWidthForSimpleText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, IntRectExtent* glyphBounds = 0) const;
141 int offsetForPositionForSimpleText(const TextRun&, float position, bool includePartialGlyphs) const;
142 FloatRect selectionRectForSimpleText(const TextRun&, const FloatPoint&, int h, int from, int to, bool accountForGlyphBounds) const;
143
144 bool getEmphasisMarkGlyphData(const AtomicString&, GlyphData&) const;
145
146 // Returns the initial in-stream advance.
147 float getGlyphsAndAdvancesForComplexText(const TextRunPaintInfo&, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const;
148 void drawComplexText(GraphicsContext*, const TextRunPaintInfo&, const FloatPoint&) const;
149 void drawEmphasisMarksForComplexText(GraphicsContext*, const TextRunPaintInfo&, const AtomicString& mark, const FloatPoint&) const;
150 float floatWidthForComplexText(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts, IntRectExtent* glyphBounds) const;
151 int offsetForPositionForComplexText(const TextRun&, float position, bool includePartialGlyphs) const;
152 FloatRect selectionRectForComplexText(const TextRun&, const FloatPoint&, int h, int from, int to) const;
153
154 friend struct WidthIterator;
155 friend class SVGTextRunRenderingContext;
156
157 public:
158 // Useful for debugging the different font rendering code paths.
159 static void setCodePath(CodePath);
160 static CodePath codePath();
161 static CodePath s_codePath;
162
163 FontSelector* fontSelector() const;
164
fontList()165 FontFallbackList* fontList() const { return m_fontFallbackList.get(); }
166
167 void willUseFontData(UChar32) const;
168
169 static FloatRect pixelSnappedSelectionRect(float fromX, float toX, float y, float height);
170 private:
loadingCustomFonts()171 bool loadingCustomFonts() const
172 {
173 return m_fontFallbackList && m_fontFallbackList->loadingCustomFonts();
174 }
175
shouldSkipDrawing()176 bool shouldSkipDrawing() const
177 {
178 return m_fontFallbackList && m_fontFallbackList->shouldSkipDrawing();
179 }
180
181 FontDescription m_fontDescription;
182 mutable RefPtr<FontFallbackList> m_fontFallbackList;
183 };
184
~Font()185 inline Font::~Font()
186 {
187 }
188
primaryFont()189 inline const SimpleFontData* Font::primaryFont() const
190 {
191 ASSERT(m_fontFallbackList);
192 return m_fontFallbackList->primarySimpleFontData(m_fontDescription);
193 }
194
fontDataAt(unsigned index)195 inline const FontData* Font::fontDataAt(unsigned index) const
196 {
197 ASSERT(m_fontFallbackList);
198 return m_fontFallbackList->fontDataAt(m_fontDescription, index);
199 }
200
isFixedPitch()201 inline bool Font::isFixedPitch() const
202 {
203 ASSERT(m_fontFallbackList);
204 return m_fontFallbackList->isFixedPitch(m_fontDescription);
205 }
206
fontSelector()207 inline FontSelector* Font::fontSelector() const
208 {
209 return m_fontFallbackList ? m_fontFallbackList->fontSelector() : 0;
210 }
211
tabWidth(const SimpleFontData & fontData,unsigned tabSize,float position)212 inline float Font::tabWidth(const SimpleFontData& fontData, unsigned tabSize, float position) const
213 {
214 if (!tabSize)
215 return fontDescription().letterSpacing();
216 float tabWidth = tabSize * fontData.spaceWidth() + fontDescription().letterSpacing();
217 return tabWidth - fmodf(position, tabWidth);
218 }
219
220 }
221
222 #endif
223