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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 612 insertions, 0 deletions

diff --git a/src/gui/text/qrawfont.cpp b/src/gui/text/qrawfont.cpp
new file mode 100644
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qglobal.h"
+
+#if !defined(QT_NO_RAWFONT)
+
+#include "qrawfont.h"
+#include "qrawfont_p.h"
+
+#include <QtCore/qthread.h>
+#include <QtCore/qendian.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+   \class QRawFont
+   \brief The QRawFont class provides access to a single physical instance of a font.
+   \since 4.8
+
+   \ingroup text
+   \mainclass
+
+   \note QRawFont is a low level class. For most purposes QFont is a more appropriate class.
+
+   Most commonly, when presenting text in a user interface, the exact fonts used
+   to render the characters is to some extent unknown. This can be the case for several
+   reasons: For instance, the actual, physical fonts present on the target system could be
+   unexpected to the developers, or the text could contain user selected styles, sizes or
+   writing systems that are not supported by font chosen in the code.
+
+   Therefore, Qt's QFont class really represents a query for fonts. When text is interpreted,
+   Qt will do its best to match the text to the query, but depending on the support, different
+   fonts can be used behind the scenes.
+
+   For most use cases, this is both expected and necessary, as it minimizes the possibility of
+   text in the user interface being undisplayable. In some cases, however, more direct control
+   over the process might be useful. It is for these use cases the QRawFont class exists.
+
+   A QRawFont object represents a single, physical instance of a given font in a given pixel size.
+   I.e. in the typical case it represents a set of TrueType or OpenType font tables and uses a
+   user specified pixel size to convert metrics into logical pixel units. In can be used in
+   combination with the QGlyphs class to draw specific glyph indexes at specific positions, and
+   also have accessors to some relevant data in the physical font.
+
+   QRawFont only provides support for the main font technologies: GDI and DirectWrite on Windows
+   platforms, FreeType on Symbian and Linux platforms and CoreText on Mac OS X. For other
+   font back-ends, the APIs will be disabled.
+
+   QRawFont can be constructed in a number of ways:
+   \list
+   \o \l It can be constructed by calling QTextLayout::glyphs() or QTextFragment::glyphs(). The
+         returned QGlyphs objects will contain QRawFont objects which represent the actual fonts
+         used to render each portion of the text.
+   \o \l It can be constructed by passing a QFont object to QRawFont::fromFont(). The function
+         will return a QRawFont object representing the font that will be selected as response to
+         the QFont query and the selected writing system.
+   \o \l It can be constructed by passing a file name or QByteArray directly to the QRawFont
+         constructor, or by calling loadFromFile() or loadFromData(). In this case, the
+         font will not be registered in QFontDatabase, and it will not be available as part of
+         regular font selection.
+   \endlist
+
+   QRawFont is considered local to the thread in which it is constructed (either using a
+   constructor, or by calling loadFromData() or loadFromFile()). The QRawFont cannot be moved to a
+   different thread, but will have to be recreated in the thread in question.
+
+   \note For the requirement of caching glyph indexes and font selections for static text to avoid
+   reshaping and relayouting in the inner loop of an application, a better choice is the QStaticText
+   class, since it optimizes the memory cost of the cache and also provides the possibility of paint
+   engine specific caches for an additional speed-up.
+*/
+
+/*!
+    \enum QRawFont::AntialiasingType
+
+    This enum represents the different ways a glyph can be rasterized in the function
+    alphaMapForGlyph().
+
+    \value PixelAntialiasing Will rasterize by measuring the coverage of the shape on whole pixels.
+           The returned image contains the alpha values of each pixel based on the coverage of
+           the glyph shape.
+    \value SubPixelAntialiasing Will rasterize by measuring the coverage of each subpixel,
+           returning a separate alpha value for each of the red, green and blue components of
+           each pixel.
+*/
+
+/*!
+   Constructs an invalid QRawFont.
+*/
+QRawFont::QRawFont()
+    : d(new QRawFontPrivate)
+{
+}
+
+/*!
+   Constructs a QRawFont representing the font contained in the file referenced by \a fileName,
+   with \a pixelSize size in pixels, and the selected \a hintingPreference.
+
+   \note The referenced file must contain a TrueType or OpenType font.
+*/
+QRawFont::QRawFont(const QString &fileName,
+                   int pixelSize,
+                   QFont::HintingPreference hintingPreference)
+    : d(new QRawFontPrivate)
+{
+    loadFromFile(fileName, pixelSize, hintingPreference);
+}
+
+/*!
+   Constructs a QRawFont representing the font contained in \a fontData.
+
+   \note The data must contain a TrueType or OpenType font.
+*/
+QRawFont::QRawFont(const QByteArray &fontData,
+                   int pixelSize,
+                   QFont::HintingPreference hintingPreference)
+    : d(new QRawFontPrivate)
+{
+    loadFromData(fontData, pixelSize, hintingPreference);
+}
+
+/*!
+   Creates a QRawFont which is a copy of \a other.
+*/
+QRawFont::QRawFont(const QRawFont &other)
+{
+    d = other.d;
+}
+
+/*!
+   Destroys the QRawFont
+*/
+QRawFont::~QRawFont()
+{
+}
+
+/*!
+  Assigns \a other to this QRawFont.
+*/
+QRawFont &QRawFont::operator=(const QRawFont &other)
+{
+    d = other.d;
+    return *this;
+}
+
+/*!
+   Returns true if the QRawFont is valid and false otherwise.
+*/
+bool QRawFont::isValid() const
+{
+    Q_ASSERT(d->thread == 0 || d->thread == QThread::currentThread());
+    return d->fontEngine != 0;
+}
+
+/*!
+   Replaces the current QRawFont with the contents of the file references by \a fileName.
+
+   The file must reference a TrueType or OpenType font.
+
+   \sa loadFromData()
+*/
+void QRawFont::loadFromFile(const QString &fileName,
+                            int pixelSize,
+                            QFont::HintingPreference hintingPreference)
+{
+    QFile file(fileName);
+    if (file.open(QIODevice::ReadOnly))
+        loadFromData(file.readAll(), pixelSize, hintingPreference);
+}
+
+/*!
+   Replaces the current QRawFont with the contents of \a fontData.
+
+   The \a fontData must contain a TrueType or OpenType font.
+
+   \sa loadFromFile()
+*/
+void QRawFont::loadFromData(const QByteArray &fontData,
+                            int pixelSize,
+                            QFont::HintingPreference hintingPreference)
+{
+    detach();
+    d->cleanUp();
+    d->hintingPreference = hintingPreference;
+    d->thread = QThread::currentThread();
+    d->platformLoadFromData(fontData, pixelSize, hintingPreference);
+}
+
+/*!
+   This function returns a rasterized image of the glyph at a given \a glyphIndex in the underlying
+   font, if the QRawFont is valid, otherwise it will return an invalid QImage.
+
+   If \a antialiasingType is set to QRawFont::SubPixelAntialiasing, then the resulting image will be
+   in QImage::Format_RGB32 and the RGB values of each pixel will represent the subpixel opacities of
+   the pixel in the rasterization of the glyph. Otherwise, the image will be in the format of
+   QImage::Format_A8 and each pixel will contain the opacity of the pixel in the rasterization.
+
+   \sa pathForGlyph(), QPainter::drawGlyphs()
+*/
+QImage QRawFont::alphaMapForGlyph(quint32 glyphIndex, AntialiasingType antialiasingType,
+                                  const QTransform &transform) const
+{
+    if (!isValid())
+        return QImage();
+
+    if (antialiasingType == SubPixelAntialiasing)
+        return d->fontEngine->alphaRGBMapForGlyph(glyphIndex, QFixed(), 0, transform);
+    else
+        return d->fontEngine->alphaMapForGlyph(glyphIndex, QFixed(), transform);
+}
+
+/*!
+   This function returns the shape of the glyph at a given \a glyphIndex in the underlying font
+   if the QRawFont is valid. Otherwise, it returns an empty QPainterPath.
+
+   The returned glyph will always be unhinted.
+
+   \sa alphaMapForGlyph(), QPainterPath::addText()
+*/
+QPainterPath QRawFont::pathForGlyph(quint32 glyphIndex) const
+{
+    if (!isValid())
+        return QPainterPath();
+
+    QFixedPoint position;
+    QPainterPath path;
+    d->fontEngine->addGlyphsToPath(&glyphIndex, &position, 1, &path, 0);
+    return path;
+}
+
+/*!
+   Returns true if this QRawFont is equal to \a other. Otherwise, returns false.
+*/
+bool QRawFont::operator==(const QRawFont &other) const
+{
+    return d->fontEngine == other.d->fontEngine;
+}
+
+/*!
+   Returns the ascent of this QRawFont in pixel units.
+
+   \sa QFontMetricsF::ascent()
+*/
+qreal QRawFont::ascent() const
+{
+    if (!isValid())
+        return 0.0;
+
+    return d->fontEngine->ascent().toReal();
+}
+
+/*!
+   Returns the descent of this QRawFont in pixel units.
+
+   \sa QFontMetricsF::descent()
+*/
+qreal QRawFont::descent() const
+{
+    if (!isValid())
+        return 0.0;
+
+    return d->fontEngine->descent().toReal();
+}
+
+/*!
+   Returns the pixel size set for this QRawFont. The pixel size affects how glyphs are
+   rasterized, the size of glyphs returned by pathForGlyph(), and is used to convert
+   internal metrics from design units to logical pixel units.
+
+   \sa setPixelSize()
+*/
+int QRawFont::pixelSize() const
+{
+    if (!isValid())
+        return -1;
+
+    return d->fontEngine->fontDef.pixelSize;
+}
+
+/*!
+   Returns the number of design units define the width and height of the em square
+   for this QRawFont. This value is used together with the pixel size when converting design metrics
+   to pixel units, as the internal metrics are specified in design units and the pixel size gives
+   the size of 1 em in pixels.
+
+   \sa pixelSize(), setPixelSize()
+*/
+qreal QRawFont::unitsPerEm() const
+{
+    if (!isValid())
+        return 0.0;
+
+    return d->fontEngine->emSquareSize().toReal();
+}
+
+/*!
+   Returns the family name of this QRawFont.
+*/
+QString QRawFont::familyName() const
+{
+    if (!isValid())
+        return QString();
+
+    return d->fontEngine->fontDef.family;
+}
+
+/*!
+   Returns the style of this QRawFont.
+
+   \sa QFont::style()
+*/
+QFont::Style QRawFont::style() const
+{
+    if (!isValid())
+        return QFont::StyleNormal;
+
+    return QFont::Style(d->fontEngine->fontDef.style);
+}
+
+/*!
+   Returns the weight of this QRawFont.
+
+   \sa QFont::weight()
+*/
+int QRawFont::weight() const
+{
+    if (!isValid())
+        return -1;
+
+    return int(d->fontEngine->fontDef.weight);
+}
+
+/*!
+   Converts a string of unicode points to glyph indexes using the CMAP table in the
+   underlying font. Note that in cases where there are other tables in the font that affect the
+   shaping of the text, the returned glyph indexes will not correctly represent the rendering
+   of the text. To get the correctly shaped text, you can use QTextLayout to lay out and shape the
+   text, and then call QTextLayout::glyphs() to get the set of glyph index list and QRawFont pairs.
+
+   \sa advancesForGlyphIndexes(), QGlyphs, QTextLayout::glyphs(), QTextFragment::glyphs()
+*/
+QVector<quint32> QRawFont::glyphIndexesForString(const QString &text) const
+{
+    if (!isValid())
+        return QVector<quint32>();
+
+    int nglyphs = text.size();
+    QVarLengthGlyphLayoutArray glyphs(nglyphs);
+    if (!d->fontEngine->stringToCMap(text.data(), text.size(), &glyphs, &nglyphs,
+                                  QTextEngine::GlyphIndicesOnly)) {
+        glyphs.resize(nglyphs);
+        if (!d->fontEngine->stringToCMap(text.data(), text.size(), &glyphs, &nglyphs,
+                                      QTextEngine::GlyphIndicesOnly)) {
+            Q_ASSERT_X(false, Q_FUNC_INFO, "stringToCMap shouldn't fail twice");
+            return QVector<quint32>();
+        }
+    }
+
+    QVector<quint32> glyphIndexes;
+    for (int i=0; i<nglyphs; ++i)
+        glyphIndexes.append(glyphs.glyphs[i]);
+
+    return glyphIndexes;
+}
+
+/*!
+   Returns the QRawFont's advances for each of the \a glyphIndexes in pixel units. The advances
+   give the distance from the position of a given glyph to where the next glyph should be drawn
+   to make it appear as if the two glyphs are unspaced.
+
+   \sa QTextLine::horizontalAdvance(), QFontMetricsF::width()
+*/
+QVector<QPointF> QRawFont::advancesForGlyphIndexes(const QVector<quint32> &glyphIndexes) const
+{
+    if (!isValid())
+        return QVector<QPointF>();
+
+    int numGlyphs = glyphIndexes.size();
+    QVarLengthGlyphLayoutArray glyphs(numGlyphs);
+    qMemCopy(glyphs.glyphs, glyphIndexes.data(), numGlyphs * sizeof(quint32));
+
+    d->fontEngine->recalcAdvances(&glyphs, 0);
+
+    QVector<QPointF> advances;
+    for (int i=0; i<numGlyphs; ++i)
+        advances.append(QPointF(glyphs.advances_x[i].toReal(), glyphs.advances_y[i].toReal()));
+
+    return advances;
+}
+
+/*!
+   Returns the hinting preference used to construct this QRawFont.
+
+   \sa QFont::hintingPreference()
+*/
+QFont::HintingPreference QRawFont::hintingPreference() const
+{
+    if (!isValid())
+        return QFont::PreferDefaultHinting;
+
+    return d->hintingPreference;
+}
+
+/*!
+   Retrieves the sfnt table named \a tagName from the underlying physical font, or an empty
+   byte array if no such table was found. The returned font table's byte order is Big Endian, like
+   the sfnt format specifies. The \a tagName must be four characters long and should be formatted
+   in the default endianness of the current platform.
+*/
+QByteArray QRawFont::fontTable(const char *tagName) const
+{
+    if (!isValid())
+        return QByteArray();
+
+    const quint32 *tagId = reinterpret_cast<const quint32 *>(tagName);
+    return d->fontEngine->getSfntTable(qToBigEndian(*tagId));
+}
+
+// From qfontdatabase.cpp
+extern QList<QFontDatabase::WritingSystem> qt_determine_writing_systems_from_truetype_bits(quint32 unicodeRange[4], quint32 codePageRange[2]);
+
+/*!
+   Returns a list of writing systems supported by the font according to designer supplied
+   information in the font file. Please note that this does not guarantee support for a
+   specific unicode point in the font. You can use the supportsCharacter() to check support
+   for a single, specific character.
+
+   \note The list is determined based on the unicode ranges and codepage ranges set in the font's
+   OS/2 table and requires such a table to be present in the underlying font file.
+
+   \sa supportsCharacter()
+*/
+QList<QFontDatabase::WritingSystem> QRawFont::supportedWritingSystems() const
+{
+    if (isValid()) {
+        QByteArray os2Table = fontTable("OS/2");
+        if (!os2Table.isEmpty() && os2Table.size() > 86) {
+            char *data = os2Table.data();
+            quint32 *bigEndianUnicodeRanges = reinterpret_cast<quint32 *>(data + 42);
+            quint32 *bigEndianCodepageRanges = reinterpret_cast<quint32 *>(data + 78);
+
+            quint32 unicodeRanges[4];
+            quint32 codepageRanges[2];
+
+            for (int i=0; i<4; ++i) {
+                if (i < 2)
+                    codepageRanges[i] = qFromBigEndian(bigEndianCodepageRanges[i]);
+                unicodeRanges[i] = qFromBigEndian(bigEndianUnicodeRanges[i]);
+            }
+
+            return qt_determine_writing_systems_from_truetype_bits(unicodeRanges, codepageRanges);
+        }
+    }
+
+    return QList<QFontDatabase::WritingSystem>();
+}
+
+/*!
+    Returns true if the font has a glyph that corresponds to the given \a character.
+
+    \sa supportedWritingSystems()
+*/
+bool QRawFont::supportsCharacter(const QChar &character) const
+{
+    if (!isValid())
+        return false;
+
+    return d->fontEngine->canRender(&character, 1);
+}
+
+/*!
+   Returns true if the font has a glyph that corresponds to the UCS-4 encoded character \a ucs4.
+
+   \sa supportedWritingSystems()
+*/
+bool QRawFont::supportsCharacter(quint32 ucs4) const
+{
+    if (!isValid())
+        return false;
+
+    QString str = QString::fromUcs4(&ucs4, 1);
+    return d->fontEngine->canRender(str.constData(), str.size());
+}
+
+// qfontdatabase.cpp
+extern int qt_script_for_writing_system(QFontDatabase::WritingSystem writingSystem);
+
+/*!
+   Fetches the physical representation based on a \a font query. The physical font returned is
+   the font that will be preferred by Qt in order to display text in the selected \a writingSystem.
+*/
+QRawFont QRawFont::fromFont(const QFont &font, QFontDatabase::WritingSystem writingSystem)
+{
+#if defined(Q_WS_MAC)
+    QTextLayout layout(QFontDatabase::writingSystemSample(writingSystem), font);
+    layout.beginLayout();
+    QTextLine line = layout.createLine();
+    layout.endLayout();
+    QList<QGlyphs> list = layout.glyphs();
+    if (list.size()) {
+        // Pick the one matches the family name we originally requested,
+        // if none of them match, just pick the first one
+        for (int i = 0; i < list.size(); i++) {
+            QGlyphs glyphs = list.at(i);
+            QRawFont rawfont = glyphs.font();
+            if (rawfont.familyName() == font.family())
+                return rawfont;
+        }
+        return list.at(0).font();
+    }
+    return QRawFont();
+#else
+    QFontPrivate *font_d = QFontPrivate::get(font);
+    int script = qt_script_for_writing_system(writingSystem);
+    QFontEngine *fe = font_d->engineForScript(script);
+
+    if (fe != 0 && fe->type() == QFontEngine::Multi) {
+        QFontEngineMulti *multiEngine = static_cast<QFontEngineMulti *>(fe);
+        fe = multiEngine->engine(0);
+        if (fe == 0) {
+            multiEngine->loadEngine(0);
+            fe = multiEngine->engine(0);
+        }
+    }
+
+    if (fe != 0) {
+        QRawFont rawFont;
+        rawFont.d.data()->fontEngine = fe;
+        rawFont.d.data()->fontEngine->ref.ref();
+        rawFont.d.data()->hintingPreference = font.hintingPreference();
+        return rawFont;
+    } else {
+        return QRawFont();
+    }
+#endif
+}
+
+/*!
+   Sets the pixel size with which this font should be rendered to \a pixelSize.
+*/
+void QRawFont::setPixelSize(int pixelSize)
+{
+    detach();
+    d->platformSetPixelSize(pixelSize);
+}
+
+/*!
+    \internal
+*/
+void QRawFont::detach()
+{
+    if (d->ref != 1)
+        d.detach();
+}
+
+/*!
+    \internal
+*/
+void QRawFontPrivate::cleanUp()
+{
+    platformCleanUp();
+    if (fontEngine != 0) {
+        fontEngine->ref.deref();
+        if (fontEngine->cache_count == 0 && fontEngine->ref == 0)
+            delete fontEngine;
+        fontEngine = 0;
+    }
+    hintingPreference = QFont::PreferDefaultHinting;
+}
+
+#endif // QT_NO_RAWFONT
+
+QT_END_NAMESPACE