1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/*
* 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, 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
* 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 "platform/PlatformExport.h"
#include "platform/fonts/FontDescription.h"
#include "platform/fonts/FontFallbackList.h"
#include "platform/fonts/SimpleFontData.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
#endif
namespace WebCore {
class FloatPoint;
class FloatRect;
class FontData;
class FontMetrics;
class FontPlatformData;
class FontSelector;
class GlyphBuffer;
class GraphicsContext;
class TextRun;
struct TextRunPaintInfo;
struct GlyphData;
struct GlyphOverflow {
GlyphOverflow()
: left(0)
, right(0)
, top(0)
, bottom(0)
, computeBounds(false)
{
}
int left;
int right;
int top;
int bottom;
bool computeBounds;
};
class PLATFORM_EXPORT Font {
public:
Font();
Font(const FontDescription&);
~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; }
void update(PassRefPtrWillBeRawPtr<FontSelector>) const;
enum CustomFontNotReadyAction { DoNotPaintIfFontNotReady, UseFallbackIfFontNotReady };
void drawText(GraphicsContext*, const TextRunPaintInfo&, const FloatPoint&, CustomFontNotReadyAction = DoNotPaintIfFontNotReady) const;
void drawEmphasisMarks(GraphicsContext*, const TextRunPaintInfo&, const AtomicString& mark, const FloatPoint&) const;
float width(const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
float width(const TextRun&, int& charsConsumed, Glyph& glyphId) 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, FontDataVariant variant = AutoVariant) const
{
return glyphDataAndPageForCharacter(c, mirror, variant).first;
}
#if OS(MACOSX)
const SimpleFontData* fontDataForCombiningCharacterSequence(const UChar*, size_t length, FontDataVariant) const;
#endif
std::pair<GlyphData, GlyphPage*> glyphDataAndPageForCharacter(UChar32, bool mirror, FontDataVariant = AutoVariant) const;
bool primaryFontHasGlyphForCharacter(UChar32) const;
CodePath codePath(const TextRun&) const;
private:
enum ForTextEmphasisOrNot { NotForTextEmphasis, ForTextEmphasis };
// Returns the initial in-stream advance.
float getGlyphsAndAdvancesForSimpleText(const TextRunPaintInfo&, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const;
void drawSimpleText(GraphicsContext*, const TextRunPaintInfo&, const FloatPoint&) const;
void drawEmphasisMarksForSimpleText(GraphicsContext*, const TextRunPaintInfo&, const AtomicString& mark, const FloatPoint&) const;
void drawGlyphs(GraphicsContext*, const SimpleFontData*, const GlyphBuffer&, unsigned from, unsigned numGlyphs, const FloatPoint&, const FloatRect& textRect) const;
void 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;
// Returns the initial in-stream advance.
float getGlyphsAndAdvancesForComplexText(const TextRunPaintInfo&, GlyphBuffer&, ForTextEmphasisOrNot = NotForTextEmphasis) const;
void drawComplexText(GraphicsContext*, const TextRunPaintInfo&, const FloatPoint&) const;
void drawEmphasisMarksForComplexText(GraphicsContext*, const TextRunPaintInfo&, const AtomicString& mark, const FloatPoint&) 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 WidthIterator;
friend class SVGTextRunRenderingContext;
public:
// Useful for debugging the different font rendering code paths.
static void setCodePath(CodePath);
static CodePath codePath();
static CodePath s_codePath;
FontSelector* fontSelector() const;
FontFallbackList* fontList() const { return m_fontFallbackList.get(); }
void willUseFontData(UChar32) const;
static FloatRect pixelSnappedSelectionRect(float fromX, float toX, float y, float height);
private:
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
{
ASSERT(m_fontFallbackList);
return m_fontFallbackList->primarySimpleFontData(m_fontDescription);
}
inline const FontData* Font::fontDataAt(unsigned index) const
{
ASSERT(m_fontFallbackList);
return m_fontFallbackList->fontDataAt(m_fontDescription, index);
}
inline bool Font::isFixedPitch() const
{
ASSERT(m_fontFallbackList);
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);
}
}
#endif
|
