1 /*
2 Copyright (C) 2008, 2009, 2010, 2011 Nokia Corporation and/or its subsidiary(-ies)
3 Copyright (C) 2008 Holger Hans Peter Freyther
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public License
16 along with this library; see the file COPYING.LIB. If not, write to
17 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19
20 This class provides all functionality needed for loading images, style sheets and html
21 pages from the web. It has a memory cache for these objects.
22 */
23
24 #include "config.h"
25 #include "SimpleFontData.h"
26
27 #include <QFontMetricsF>
28
29 namespace WebCore {
30
determinePitch()31 void SimpleFontData::determinePitch()
32 {
33 m_treatAsFixedPitch = m_platformData.font().fixedPitch();
34 }
35
containsCharacters(const UChar *,int) const36 bool SimpleFontData::containsCharacters(const UChar*, int) const
37 {
38 return true;
39 }
40
platformInit()41 void SimpleFontData::platformInit()
42 {
43 if (!m_platformData.size()) {
44 m_fontMetrics.reset();
45 m_avgCharWidth = 0;
46 m_maxCharWidth = 0;
47 return;
48 }
49
50 QFontMetricsF fm(m_platformData.font());
51
52 // Qt subtracts 1 from the descent to account for the baseline,
53 // we add it back here to get correct metrics for WebKit.
54 float descent = fm.descent() + 1;
55 float ascent = fm.ascent();
56
57 float lineSpacing = fm.lineSpacing();
58
59 // The line spacing should always be >= (ascent + descent), but this
60 // may be false in some cases due to misbehaving platform libraries.
61 // Workaround from SimpleFontPango.cpp and SimpleFontFreeType.cpp
62 if (lineSpacing < ascent + descent)
63 lineSpacing = ascent + descent;
64
65 // QFontMetricsF::leading() may return negative values on platforms
66 // such as FreeType. Calculate the line gap manually instead.
67 float lineGap = lineSpacing - ascent - descent;
68
69 m_fontMetrics.setAscent(ascent);
70 m_fontMetrics.setDescent(descent);
71 m_fontMetrics.setLineSpacing(lineSpacing);
72 m_fontMetrics.setXHeight(fm.xHeight());
73 m_fontMetrics.setLineGap(lineGap);
74 m_spaceWidth = fm.width(QLatin1Char(' '));
75 }
76
platformGlyphInit()77 void SimpleFontData::platformGlyphInit()
78 {
79 if (!m_platformData.size())
80 return;
81 m_spaceGlyph = 0;
82 determinePitch();
83 m_missingGlyphData.fontData = this;
84 m_missingGlyphData.glyph = 0;
85 }
86
platformCharWidthInit()87 void SimpleFontData::platformCharWidthInit()
88 {
89 if (!m_platformData.size())
90 return;
91 QFontMetrics fm(m_platformData.font());
92 m_avgCharWidth = fm.averageCharWidth();
93 m_maxCharWidth = fm.maxWidth();
94 }
95
platformDestroy()96 void SimpleFontData::platformDestroy()
97 {
98 }
99
100 }
101