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/*
Copyright (C) 2008, 2009, 2010, 2011 Nokia Corporation and/or its subsidiary(-ies)
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.
This class provides all functionality needed for loading images, style sheets and html
pages from the web. It has a memory cache for these objects.
*/
#include "config.h"
#include "SimpleFontData.h"
#if HAVE(QRAWFONT)
#include "NotImplemented.h"
#else
#include <QFontMetricsF>
#endif
namespace WebCore {
void SimpleFontData::determinePitch()
{
#if HAVE(QRAWFONT)
notImplemented();
m_treatAsFixedPitch = false;
#else
m_treatAsFixedPitch = m_platformData.font().fixedPitch();
#endif
}
#if HAVE(QRAWFONT)
static const float smallCapsFraction = 0.7;
static const float emphasisMarkFraction = 0.5;
bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
QRawFont rawFont(m_platformData.rawFont());
for (int i = 0; i < length; ++i) {
if (!rawFont.supportsCharacter(static_cast<QChar>(characters[i])))
return false;
}
return true;
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
if (!platformData().size())
return 0;
QVector<quint32> glyphIndexes;
glyphIndexes.append(glyph);
QVector<QPointF> advances = platformData().rawFont().advancesForGlyphIndexes(glyphIndexes);
ASSERT(!advances.isEmpty());
return advances.at(0).x();
}
SimpleFontData* SimpleFontData::scaledFontData(const FontDescription& fontDescription, float scaleFactor) const
{
const float scaledSize = lroundf(fontDescription.computedSize() * scaleFactor);
return new SimpleFontData(FontPlatformData(m_platformData, scaledSize), isCustomFont(), false);
}
SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->smallCaps)
m_derivedFontData->smallCaps = scaledFontData(fontDescription, smallCapsFraction);
return m_derivedFontData->smallCaps.get();
}
SimpleFontData* SimpleFontData::emphasisMarkFontData(const FontDescription& fontDescription) const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->emphasisMark)
m_derivedFontData->emphasisMark = scaledFontData(fontDescription, emphasisMarkFraction);
return m_derivedFontData->emphasisMark.get();
}
FloatRect SimpleFontData::platformBoundsForGlyph(Glyph) const
{
notImplemented();
return FloatRect();
}
#else
bool SimpleFontData::containsCharacters(const UChar*, int) const
{
return true;
}
void SimpleFontData::platformGlyphInit()
{
if (!m_platformData.size())
return;
m_spaceGlyph = 0;
determinePitch();
m_missingGlyphData.fontData = this;
m_missingGlyphData.glyph = 0;
}
#endif
void SimpleFontData::platformInit()
{
if (!m_platformData.size()) {
m_fontMetrics.reset();
m_avgCharWidth = 0;
m_maxCharWidth = 0;
return;
}
#if HAVE(QRAWFONT)
QRawFont rawFont(m_platformData.rawFont());
float descent = rawFont.descent();
float ascent = rawFont.ascent();
float xHeight = rawFont.xHeight();
float lineSpacing = ascent + descent + rawFont.leading() + 1;
QVector<quint32> indexes = rawFont.glyphIndexesForString(QLatin1String(" "));
QVector<QPointF> advances = rawFont.advancesForGlyphIndexes(indexes);
float spaceWidth = advances.at(0).x();
#else
QFontMetricsF fm(m_platformData.font());
float descent = fm.descent();
float ascent = fm.ascent();
float xHeight = fm.xHeight();
float lineSpacing = fm.lineSpacing();
float spaceWidth = fm.width(QLatin1Char(' '));
#endif
// Qt subtracts 1 from the descent to account for the baseline,
// we add it back here to get correct metrics for WebKit.
descent += 1;
// The line spacing should always be >= (ascent + descent), but this
// may be false in some cases due to misbehaving platform libraries.
// Workaround from SimpleFontPango.cpp and SimpleFontFreeType.cpp
if (lineSpacing < ascent + descent)
lineSpacing = ascent + descent;
// QFontMetricsF::leading() may return negative values on platforms
// such as FreeType. Calculate the line gap manually instead.
float lineGap = lineSpacing - ascent - descent;
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
m_fontMetrics.setLineSpacing(lineSpacing);
m_fontMetrics.setXHeight(xHeight);
m_fontMetrics.setLineGap(lineGap);
m_spaceWidth = spaceWidth;
}
void SimpleFontData::platformCharWidthInit()
{
if (!m_platformData.size())
return;
#if HAVE(QRAWFONT)
QRawFont rawFont(m_platformData.rawFont());
m_avgCharWidth = rawFont.averageCharWidth();
m_maxCharWidth = rawFont.maxCharWidth();
#else
QFontMetricsF fm(m_platformData.font());
m_avgCharWidth = fm.averageCharWidth();
m_maxCharWidth = fm.maxWidth();
#endif
}
void SimpleFontData::platformDestroy()
{
}
}
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