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
|
/*
* Copyright (C) 2005, 2008 Apple Computer, 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 "FontMetrics.h"
#if ENABLE(SVG_FONTS)
#include "SVGFontData.h"
#include "SVGFontFaceElement.h"
#endif
#include <wtf/MathExtras.h>
namespace WebCore {
SimpleFontData::SimpleFontData(const FontPlatformData& f, bool customFont, bool loading, SVGFontData* svgFontData)
: m_font(f)
, m_treatAsFixedPitch(false)
#if ENABLE(SVG_FONTS)
, m_svgFontData(svgFontData)
#endif
, m_isCustomFont(customFont)
, m_isLoading(loading)
, m_smallCapsFontData(0)
, m_cjkGlyphWidth(cGlyphWidthUnknown)
{
#if ENABLE(SVG_FONTS) && !PLATFORM(QT)
if (SVGFontFaceElement* svgFontFaceElement = svgFontData ? svgFontData->svgFontFaceElement() : 0) {
m_unitsPerEm = svgFontFaceElement->unitsPerEm();
double scale = f.size();
if (m_unitsPerEm)
scale /= m_unitsPerEm;
m_ascent = static_cast<int>(svgFontFaceElement->ascent() * scale);
m_descent = static_cast<int>(svgFontFaceElement->descent() * scale);
// TODO(ojan): What should SVG fonts use for avgCharWidth/maxCharWidth?
// This is currently only used in RenderTextControl.cpp for the width
// of textareas with a non-fixed width.
m_avgCharWidth = 0;
m_maxCharWidth = 0;
m_xHeight = static_cast<int>(svgFontFaceElement->xHeight() * scale);
m_lineGap = 0.1f * f.size();
m_lineSpacing = m_ascent + m_descent + m_lineGap;
m_spaceGlyph = 0;
m_spaceWidth = 0;
m_adjustedSpaceWidth = 0;
determinePitch();
m_missingGlyphData.fontData = this;
m_missingGlyphData.glyph = 0;
return;
}
#endif
platformInit();
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
if (!glyphPageZero) {
LOG_ERROR("Failed to get glyph page zero.");
m_spaceGlyph = 0;
m_spaceWidth = 0;
m_adjustedSpaceWidth = 0;
determinePitch();
m_missingGlyphData.fontData = this;
m_missingGlyphData.glyph = 0;
return;
}
// 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.
static const UChar32 space_char = ' ';
m_spaceGlyph = glyphPageZero->glyphDataForCharacter(space_char).glyph;
float width = widthForGlyph(space_char, m_spaceGlyph);
m_spaceWidth = width;
determinePitch();
m_adjustedSpaceWidth = m_treatAsFixedPitch ? ceilf(width) : roundf(width);
// 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.
Glyph zeroWidthSpaceGlyph = glyphPageZero->glyphDataForCharacter(0).glyph;
if (zeroWidthSpaceGlyph) {
if (zeroWidthSpaceGlyph != m_spaceGlyph)
m_glyphToWidthMap.setWidthForGlyph(zeroWidthSpaceGlyph, 0);
else
LOG_ERROR("Font maps SPACE and ZERO WIDTH SPACE to the same glyph. Glyph width not overridden.");
}
m_missingGlyphData.fontData = this;
m_missingGlyphData.glyph = 0;
}
SimpleFontData::~SimpleFontData()
{
#if ENABLE(SVG_FONTS) && !PLATFORM(QT)
if (!m_svgFontData || !m_svgFontData->svgFontFaceElement())
#endif
platformDestroy();
// We only get deleted when the cache gets cleared. Since the smallCapsRenderer is also in that cache,
// it will be deleted then, so we don't need to do anything here.
}
// Use the character corresponding the glyph to determine if the glyph
// is a fixed width CJK glyph. This will allow us to save on storage in
// GlyphWidthMap for CJK glyph entries having the same width value.
float SimpleFontData::widthForGlyph(UChar32 c, Glyph glyph) const
{
bool is_CJK = IsCJKCodePoint(c);
float width = is_CJK ? m_cjkGlyphWidth : m_glyphToWidthMap.widthForGlyph(glyph);
#ifndef NDEBUG
// Test our optimization that assuming all CGK glyphs have the same width
if (is_CJK) {
const float actual_width = platformWidthForGlyph(glyph);
ASSERT((cGlyphWidthUnknown == width) || (actual_width == width));
}
#endif
// Some characters should be zero width and we want to ignore whatever
// crazy stuff the font may have (or not defined). If the font doesn't
// define it, we don't want to measure the width of the "invalid character"
// box, for example.
//
// TODO(brettw): we should have Font::treatAsZeroWidthSpace return true for
// zero width spaces (U+200B) just like Font::treatAsSpace will return true
// for spaces. Then the additional OR is not necessary.
if (Font::treatAsZeroWidthSpace(c) || c == 0x200b)
return 0.0f;
if (width != cGlyphWidthUnknown)
return width;
width = platformWidthForGlyph(glyph);
if (is_CJK) {
m_cjkGlyphWidth = width;
} else {
m_glyphToWidthMap.setWidthForGlyph(glyph, width);
}
return width;
}
const SimpleFontData* SimpleFontData::fontDataForCharacter(UChar32) const
{
return this;
}
bool SimpleFontData::isSegmented() const
{
return false;
}
bool SimpleFontData::IsCJKCodePoint(UChar32 c) const
{
// 3400..4DBF; CJK Unified Ideographs Extension A
// 4DC0..4DFF; Yijing Hexagram Symbols
// 4E00..9FFF; CJK Unified Ideographs
if ((0x3400 <= c) && (c <= 0x9FFF))
return true;
// AC00..D7AF; Hangul Syllables
if ((0xAC00 <= c) && (c <= 0xD7AF))
return true;
// F900..FAFF; CJK Compatibility Ideographs
if ((0xF900 <= c) && (c <= 0xFAFF))
return true;
return false;
}
} // namespace WebCore
|
