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 31 void SimpleFontData::determinePitch() 32 { 33 m_treatAsFixedPitch = m_platformData.font().fixedPitch(); 34 } 35 36 bool SimpleFontData::containsCharacters(const UChar*, int) const 37 { 38 return true; 39 } 40 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 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 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 96 void SimpleFontData::platformDestroy() 97 { 98 } 99 100 } 101
