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
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
|
/*
* Copyright (C) 2005, 2008, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2006 Alexey Proskuryakov
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "SimpleFontData.h"
#include "Font.h"
#include "FontCache.h"
#if ENABLE(SVG_FONTS)
#include "SVGFontData.h"
#include "SVGFontElement.h"
#include "SVGFontFaceElement.h"
#include "SVGGlyphElement.h"
#endif
#include <wtf/MathExtras.h>
#include <wtf/UnusedParam.h>
using namespace std;
namespace WebCore {
SimpleFontData::SimpleFontData(const FontPlatformData& platformData, bool isCustomFont, bool isLoading, bool isTextOrientationFallback)
: m_maxCharWidth(-1)
, m_avgCharWidth(-1)
, m_platformData(platformData)
, m_treatAsFixedPitch(false)
, m_isCustomFont(isCustomFont)
, m_isLoading(isLoading)
, m_isTextOrientationFallback(isTextOrientationFallback)
, m_isBrokenIdeographFallback(false)
, m_hasVerticalGlyphs(false)
{
platformInit();
platformGlyphInit();
platformCharWidthInit();
}
#if ENABLE(SVG_FONTS)
SimpleFontData::SimpleFontData(PassOwnPtr<SVGFontData> svgFontData, int size, bool syntheticBold, bool syntheticItalic)
: m_platformData(FontPlatformData(size, syntheticBold, syntheticItalic))
, m_treatAsFixedPitch(false)
, m_svgFontData(svgFontData)
, m_isCustomFont(true)
, m_isLoading(false)
, m_isTextOrientationFallback(false)
, m_isBrokenIdeographFallback(false)
, m_hasVerticalGlyphs(false)
{
SVGFontFaceElement* svgFontFaceElement = m_svgFontData->svgFontFaceElement();
unsigned unitsPerEm = svgFontFaceElement->unitsPerEm();
float scale = size;
if (unitsPerEm)
scale /= unitsPerEm;
float xHeight = svgFontFaceElement->xHeight() * scale;
float ascent = svgFontFaceElement->ascent() * scale;
float descent = svgFontFaceElement->descent() * scale;
float lineGap = 0.1f * size;
SVGFontElement* associatedFontElement = svgFontFaceElement->associatedFontElement();
if (!xHeight) {
// Fallback if x_heightAttr is not specified for the font element.
Vector<SVGGlyphIdentifier> letterXGlyphs;
associatedFontElement->getGlyphIdentifiersForString(String("x", 1), letterXGlyphs);
xHeight = letterXGlyphs.isEmpty() ? 2 * ascent / 3 : letterXGlyphs.first().horizontalAdvanceX * scale;
}
m_fontMetrics.setUnitsPerEm(unitsPerEm);
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setLineSpacing(roundf(ascent) + roundf(descent) + roundf(lineGap));
m_fontMetrics.setXHeight(xHeight);
Vector<SVGGlyphIdentifier> spaceGlyphs;
associatedFontElement->getGlyphIdentifiersForString(String(" ", 1), spaceGlyphs);
m_spaceWidth = spaceGlyphs.isEmpty() ? xHeight : spaceGlyphs.first().horizontalAdvanceX * scale;
Vector<SVGGlyphIdentifier> numeralZeroGlyphs;
associatedFontElement->getGlyphIdentifiersForString(String("0", 1), numeralZeroGlyphs);
m_avgCharWidth = numeralZeroGlyphs.isEmpty() ? m_spaceWidth : numeralZeroGlyphs.first().horizontalAdvanceX * scale;
Vector<SVGGlyphIdentifier> letterWGlyphs;
associatedFontElement->getGlyphIdentifiersForString(String("W", 1), letterWGlyphs);
m_maxCharWidth = letterWGlyphs.isEmpty() ? ascent : letterWGlyphs.first().horizontalAdvanceX * scale;
// FIXME: is there a way we can get the space glyph from the SVGGlyphIdentifier above?
m_spaceGlyph = 0;
m_zeroWidthSpaceGlyph = 0;
determinePitch();
m_missingGlyphData.fontData = this;
m_missingGlyphData.glyph = 0;
}
#endif
#if !PLATFORM(QT)
// Estimates of avgCharWidth and maxCharWidth for platforms that don't support accessing these values from the font.
void SimpleFontData::initCharWidths()
{
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
// Treat the width of a '0' as the avgCharWidth.
if (m_avgCharWidth <= 0.f && glyphPageZero) {
static const UChar32 digitZeroChar = '0';
Glyph digitZeroGlyph = glyphPageZero->glyphDataForCharacter(digitZeroChar).glyph;
if (digitZeroGlyph)
m_avgCharWidth = widthForGlyph(digitZeroGlyph);
}
// If we can't retrieve the width of a '0', fall back to the x height.
if (m_avgCharWidth <= 0.f)
m_avgCharWidth = m_fontMetrics.xHeight();
if (m_maxCharWidth <= 0.f)
m_maxCharWidth = max(m_avgCharWidth, m_fontMetrics.floatAscent());
}
void SimpleFontData::platformGlyphInit()
{
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
if (!glyphPageZero) {
LOG_ERROR("Failed to get glyph page zero.");
m_spaceGlyph = 0;
m_spaceWidth = 0;
determinePitch();
m_zeroWidthSpaceGlyph = 0;
m_missingGlyphData.fontData = this;
m_missingGlyphData.glyph = 0;
return;
}
m_zeroWidthSpaceGlyph = glyphPageZero->glyphDataForCharacter(0).glyph;
// Nasty hack to determine if we should round or ceil space widths.
// If the font is monospace or fake monospace we ceil to ensure that
// every character and the space are the same width. Otherwise we round.
m_spaceGlyph = glyphPageZero->glyphDataForCharacter(' ').glyph;
float width = widthForGlyph(m_spaceGlyph);
m_spaceWidth = width;
determinePitch();
// Force the glyph for ZERO WIDTH SPACE to have zero width, unless it is shared with SPACE.
// Helvetica is an example of a non-zero width ZERO WIDTH SPACE glyph.
// See <http://bugs.webkit.org/show_bug.cgi?id=13178>
// Ask for the glyph for 0 to avoid paging in ZERO WIDTH SPACE. Control characters, including 0,
// are mapped to the ZERO WIDTH SPACE glyph.
if (m_zeroWidthSpaceGlyph == m_spaceGlyph) {
m_zeroWidthSpaceGlyph = 0;
LOG_ERROR("Font maps SPACE and ZERO WIDTH SPACE to the same glyph. Glyph width will not be overridden.");
}
m_missingGlyphData.fontData = this;
m_missingGlyphData.glyph = 0;
}
#endif
SimpleFontData::~SimpleFontData()
{
#if ENABLE(SVG_FONTS)
if (!m_svgFontData || !m_svgFontData->svgFontFaceElement())
#endif
platformDestroy();
if (!isCustomFont())
GlyphPageTreeNode::pruneTreeFontData(this);
}
const SimpleFontData* SimpleFontData::fontDataForCharacter(UChar32) const
{
return this;
}
bool SimpleFontData::isSegmented() const
{
return false;
}
SimpleFontData* SimpleFontData::verticalRightOrientationFontData() const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->verticalRightOrientation) {
FontPlatformData verticalRightPlatformData(m_platformData);
verticalRightPlatformData.setOrientation(Horizontal);
m_derivedFontData->verticalRightOrientation = new SimpleFontData(verticalRightPlatformData, isCustomFont(), false, true);
}
return m_derivedFontData->verticalRightOrientation.get();
}
SimpleFontData* SimpleFontData::uprightOrientationFontData() const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->uprightOrientation)
m_derivedFontData->uprightOrientation = new SimpleFontData(m_platformData, isCustomFont(), false, true);
return m_derivedFontData->uprightOrientation.get();
}
SimpleFontData* SimpleFontData::brokenIdeographFontData() const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->brokenIdeograph) {
m_derivedFontData->brokenIdeograph = new SimpleFontData(m_platformData, isCustomFont(), false);
m_derivedFontData->brokenIdeograph->m_isBrokenIdeographFallback = true;
}
return m_derivedFontData->brokenIdeograph.get();
}
#ifndef NDEBUG
String SimpleFontData::description() const
{
if (isSVGFont())
return "[SVG font]";
if (isCustomFont())
return "[custom font]";
return platformData().description();
}
#endif
PassOwnPtr<SimpleFontData::DerivedFontData> SimpleFontData::DerivedFontData::create(bool forCustomFont)
{
return adoptPtr(new DerivedFontData(forCustomFont));
}
SimpleFontData::DerivedFontData::~DerivedFontData()
{
if (!forCustomFont)
return;
if (smallCaps)
GlyphPageTreeNode::pruneTreeCustomFontData(smallCaps.get());
if (emphasisMark)
GlyphPageTreeNode::pruneTreeCustomFontData(emphasisMark.get());
if (brokenIdeograph)
GlyphPageTreeNode::pruneTreeCustomFontData(brokenIdeograph.get());
if (verticalRightOrientation)
GlyphPageTreeNode::pruneTreeCustomFontData(verticalRightOrientation.get());
if (uprightOrientation)
GlyphPageTreeNode::pruneTreeCustomFontData(uprightOrientation.get());
}
} // namespace WebCore
|
