QtPlatformSupport: A helper library for platform plugins

QtPlatformSupport is a static library. Platform plugins are meant to
link against this library to pull in dependencies such as fontengines
and convenience functions for finding the right GL configs. The linker
will only pull in the symbols used, so the size of the library doesn't
really matter

1 files changed, 328 insertions, 0 deletions

diff --git a/src/platformsupport/fontdatabases/basicunix/qbasicunixfontdatabase.cpp b/src/platformsupport/fontdatabases/basicunix/qbasicunixfontdatabase.cpp
new file mode 100644
index 0000000000..1b0966d4b8
--- /dev/null
+++ b/src/platformsupport/fontdatabases/basicunix/qbasicunixfontdatabase.cpp
@@ -0,0 +1,328 @@
+/****************************************************************************
+**
+** 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 plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qbasicunixfontdatabase_p.h"
+
+#include <QtGui/private/qguiapplication_p.h>
+#include <QtGui/QPlatformScreen>
+
+#include <QtCore/QFile>
+#include <QtCore/QLibraryInfo>
+#include <QtCore/QDir>
+
+#undef QT_NO_FREETYPE
+#include <QtGui/private/qfontengine_ft_p.h>
+#include <QtGui/private/qfontengine_p.h>
+
+#include <ft2build.h>
+#include FT_TRUETYPE_TABLES_H
+
+#define SimplifiedChineseCsbBit 18
+#define TraditionalChineseCsbBit 20
+#define JapaneseCsbBit 17
+#define KoreanCsbBit 21
+
+static int requiredUnicodeBits[QFontDatabase::WritingSystemsCount][2] = {
+        // Any,
+    { 127, 127 },
+        // Latin,
+    { 0, 127 },
+        // Greek,
+    { 7, 127 },
+        // Cyrillic,
+    { 9, 127 },
+        // Armenian,
+    { 10, 127 },
+        // Hebrew,
+    { 11, 127 },
+        // Arabic,
+    { 13, 127 },
+        // Syriac,
+    { 71, 127 },
+    //Thaana,
+    { 72, 127 },
+    //Devanagari,
+    { 15, 127 },
+    //Bengali,
+    { 16, 127 },
+    //Gurmukhi,
+    { 17, 127 },
+    //Gujarati,
+    { 18, 127 },
+    //Oriya,
+    { 19, 127 },
+    //Tamil,
+    { 20, 127 },
+    //Telugu,
+    { 21, 127 },
+    //Kannada,
+    { 22, 127 },
+    //Malayalam,
+    { 23, 127 },
+    //Sinhala,
+    { 73, 127 },
+    //Thai,
+    { 24, 127 },
+    //Lao,
+    { 25, 127 },
+    //Tibetan,
+    { 70, 127 },
+    //Myanmar,
+    { 74, 127 },
+        // Georgian,
+    { 26, 127 },
+        // Khmer,
+    { 80, 127 },
+        // SimplifiedChinese,
+    { 126, 127 },
+        // TraditionalChinese,
+    { 126, 127 },
+        // Japanese,
+    { 126, 127 },
+        // Korean,
+    { 56, 127 },
+        // Vietnamese,
+    { 0, 127 }, // same as latin1
+        // Other,
+    { 126, 127 },
+        // Ogham,
+    { 78, 127 },
+        // Runic,
+    { 79, 127 },
+        // Nko,
+    { 14, 127 },
+};
+
+static QSupportedWritingSystems determineWritingSystemsFromTrueTypeBits(quint32 unicodeRange[4], quint32 codePageRange[2])
+{
+    QSupportedWritingSystems writingSystems;
+    bool hasScript = false;
+
+    int i;
+    for(i = 0; i < QFontDatabase::WritingSystemsCount; i++) {
+        int bit = requiredUnicodeBits[i][0];
+        int index = bit/32;
+        int flag =  1 << (bit&31);
+        if (bit != 126 && unicodeRange[index] & flag) {
+            bit = requiredUnicodeBits[i][1];
+            index = bit/32;
+
+            flag =  1 << (bit&31);
+            if (bit == 127 || unicodeRange[index] & flag) {
+                writingSystems.setSupported(QFontDatabase::WritingSystem(i));
+                hasScript = true;
+                // qDebug("font %s: index=%d, flag=%8x supports script %d", familyName.latin1(), index, flag, i);
+            }
+        }
+    }
+    if(codePageRange[0] & (1 << SimplifiedChineseCsbBit)) {
+        writingSystems.setSupported(QFontDatabase::SimplifiedChinese);
+        hasScript = true;
+        //qDebug("font %s supports Simplified Chinese", familyName.latin1());
+    }
+    if(codePageRange[0] & (1 << TraditionalChineseCsbBit)) {
+        writingSystems.setSupported(QFontDatabase::TraditionalChinese);
+        hasScript = true;
+        //qDebug("font %s supports Traditional Chinese", familyName.latin1());
+    }
+    if(codePageRange[0] & (1 << JapaneseCsbBit)) {
+        writingSystems.setSupported(QFontDatabase::Japanese);
+        hasScript = true;
+        //qDebug("font %s supports Japanese", familyName.latin1());
+    }
+    if(codePageRange[0] & (1 << KoreanCsbBit)) {
+        writingSystems.setSupported(QFontDatabase::Korean);
+        hasScript = true;
+        //qDebug("font %s supports Korean", familyName.latin1());
+    }
+    if (!hasScript)
+        writingSystems.setSupported(QFontDatabase::Symbol);
+
+    return writingSystems;
+}
+
+static inline bool scriptRequiresOpenType(int script)
+{
+    return ((script >= QUnicodeTables::Syriac && script <= QUnicodeTables::Sinhala)
+            || script == QUnicodeTables::Khmer || script == QUnicodeTables::Nko);
+}
+
+void QBasicUnixFontDatabase::populateFontDatabase()
+{
+    QPlatformFontDatabase::populateFontDatabase();
+    QString fontpath = fontDir();
+
+    if(!QFile::exists(fontpath)) {
+        qFatal("QFontDatabase: Cannot find font directory %s - is Qt installed correctly?",
+               qPrintable(fontpath));
+    }
+
+    QDir dir(fontpath);
+    dir.setNameFilters(QStringList() << QLatin1String("*.ttf")
+                       << QLatin1String("*.ttc") << QLatin1String("*.pfa")
+                       << QLatin1String("*.pfb"));
+    dir.refresh();
+    for (int i = 0; i < int(dir.count()); ++i) {
+        const QByteArray file = QFile::encodeName(dir.absoluteFilePath(dir[i]));
+//        qDebug() << "looking at" << file;
+        addTTFile(QByteArray(), file);
+    }
+}
+
+QFontEngine *QBasicUnixFontDatabase::fontEngine(const QFontDef &fontDef, QUnicodeTables::Script script, void *usrPtr)
+{
+    QFontEngineFT *engine;
+    FontFile *fontfile = static_cast<FontFile *> (usrPtr);
+    QFontEngine::FaceId fid;
+    fid.filename = fontfile->fileName.toLocal8Bit();
+    fid.index = fontfile->indexValue;
+    engine = new QFontEngineFT(fontDef);
+
+    bool antialias = !(fontDef.styleStrategy & QFont::NoAntialias);
+    QFontEngineFT::GlyphFormat format = antialias? QFontEngineFT::Format_A8 : QFontEngineFT::Format_Mono;
+    if (!engine->init(fid,antialias,format)) {
+        delete engine;
+        engine = 0;
+        return engine;
+    }
+    if (engine->invalid()) {
+        delete engine;
+        engine = 0;
+    } else if (scriptRequiresOpenType(script)) {
+        HB_Face hbFace = engine->harfbuzzFace();
+        if (!hbFace || !hbFace->supported_scripts[script]) {
+            delete engine;
+            engine = 0;
+        }
+    }
+
+    return engine;
+}
+
+QStringList QBasicUnixFontDatabase::fallbacksForFamily(const QString family, const QFont::Style &style, const QUnicodeTables::Script &script) const
+{
+    Q_UNUSED(family);
+    Q_UNUSED(style);
+    Q_UNUSED(script);
+    return QStringList();
+}
+
+QStringList QBasicUnixFontDatabase::addApplicationFont(const QByteArray &fontData, const QString &fileName)
+{
+    return addTTFile(fontData,fileName.toLocal8Bit());
+}
+
+void QBasicUnixFontDatabase::releaseHandle(void *handle)
+{
+    FontFile *file = static_cast<FontFile *>(handle);
+    delete file;
+}
+
+QStringList QBasicUnixFontDatabase::addTTFile(const QByteArray &fontData, const QByteArray &file)
+{
+    extern FT_Library qt_getFreetype();
+    FT_Library library = qt_getFreetype();
+
+    int index = 0;
+    int numFaces = 0;
+    QStringList families;
+    do {
+        FT_Face face;
+        FT_Error error;
+        if (!fontData.isEmpty()) {
+            error = FT_New_Memory_Face(library, (const FT_Byte *)fontData.constData(), fontData.size(), index, &face);
+        } else {
+            error = FT_New_Face(library, file.constData(), index, &face);
+        }
+        if (error != FT_Err_Ok) {
+            qDebug() << "FT_New_Face failed with index" << index << ":" << hex << error;
+            break;
+        }
+        numFaces = face->num_faces;
+
+        QFont::Weight weight = QFont::Normal;
+
+        QFont::Style style = QFont::StyleNormal;
+        if (face->style_flags & FT_STYLE_FLAG_ITALIC)
+            style = QFont::StyleItalic;
+
+        if (face->style_flags & FT_STYLE_FLAG_BOLD)
+            weight = QFont::Bold;
+
+        QSupportedWritingSystems writingSystems;
+        // detect symbol fonts
+        for (int i = 0; i < face->num_charmaps; ++i) {
+            FT_CharMap cm = face->charmaps[i];
+            if (cm->encoding == ft_encoding_adobe_custom
+                    || cm->encoding == ft_encoding_symbol) {
+                writingSystems.setSupported(QFontDatabase::Symbol);
+                break;
+            }
+        }
+
+        TT_OS2 *os2 = (TT_OS2 *)FT_Get_Sfnt_Table(face, ft_sfnt_os2);
+        if (os2) {
+            quint32 unicodeRange[4] = {
+                os2->ulUnicodeRange1, os2->ulUnicodeRange2, os2->ulUnicodeRange3, os2->ulUnicodeRange4
+                    };
+            quint32 codePageRange[2] = {
+                os2->ulCodePageRange1, os2->ulCodePageRange2
+                    };
+
+            writingSystems = determineWritingSystemsFromTrueTypeBits(unicodeRange, codePageRange);
+        }
+
+        QString family = QString::fromAscii(face->family_name);
+        FontFile *fontFile = new FontFile;
+        fontFile->fileName = QString::fromAscii(file);
+        fontFile->indexValue = index;
+
+        QFont::Stretch stretch = QFont::Unstretched;
+
+        registerFont(family,QString(),weight,style,stretch,true,true,0,writingSystems,fontFile);
+
+        families.append(family);
+
+        FT_Done_Face(face);
+        ++index;
+    } while (index < numFaces);
+    return families;
+}