Initial pluggable fontdatabase

QPlatformFontDatabase added. QPlatformIntegration now has a new virtual
function: QPlatformDatabase::fontDatabase() const. Most unix platform
plugins wants to follow the pattern implemented in directfb, linuxfb,
vnc etc. In the pro file do:
include(../fontdatabases/genericunix/genericunix.pri)

In the QPlatformIntegration class do:

and instansiate a QGenericFontDatabase in the constructor and return
it in the getter function.

1 files changed, 195 insertions, 0 deletions

diff --git a/src/gui/text/qplatformfontdatabase_qpa.cpp b/src/gui/text/qplatformfontdatabase_qpa.cpp
new file mode 100644
index 0000000000..7bb1f9a1b5
--- /dev/null
+++ b/src/gui/text/qplatformfontdatabase_qpa.cpp
@@ -0,0 +1,195 @@
+#include "qplatformfontdatabase_qpa.h"
+#include <QtGui/private/qfontengine_p.h>
+#include <QtGui/private/qfontengine_qpa_p.h>
+#include <QtCore/QLibraryInfo>
+#include <QtCore/QDir>
+
+QT_BEGIN_NAMESPACE
+
+extern void qt_registerFont(const QString &familyname, const QString &foundryname, int weight,
+                                         QFont::Style style, int stretch, bool antialiased,bool scalable, int pixelSize,
+                                         const QSupportedWritingSystems &writingSystems, void *hanlde);
+
+void QPlatformFontDatabase::registerQPF2Font(const QByteArray &dataArray, void *handle)
+{
+    if (dataArray.size() == 0)
+        return;
+
+    const uchar *data = reinterpret_cast<const uchar *>(dataArray.constData());
+    if (QFontEngineQPA::verifyHeader(data, dataArray.size())) {
+        QString fontName = QFontEngineQPA::extractHeaderField(data, QFontEngineQPA::Tag_FontName).toString();
+        int pixelSize = QFontEngineQPA::extractHeaderField(data, QFontEngineQPA::Tag_PixelSize).toInt();
+        QVariant weight = QFontEngineQPA::extractHeaderField(data, QFontEngineQPA::Tag_Weight);
+        QVariant style = QFontEngineQPA::extractHeaderField(data, QFontEngineQPA::Tag_Style);
+        QByteArray writingSystemBits = QFontEngineQPA::extractHeaderField(data, QFontEngineQPA::Tag_WritingSystems).toByteArray();
+
+        if (!fontName.isEmpty() && pixelSize) {
+            int fontWeight = 50;
+            if (weight.type() == QVariant::Int || weight.type() == QVariant::UInt)
+                fontWeight = weight.toInt();
+
+            QFont::Style fontStyle = static_cast<QFont::Style>(style.toInt());
+
+            QSupportedWritingSystems writingSystems;
+            for (int i = 0; i < writingSystemBits.count(); ++i) {
+                uchar currentByte = writingSystemBits.at(i);
+                for (int j = 0; j < 8; ++j) {
+                    if (currentByte & 1)
+                        writingSystems.setSupported(QFontDatabase::WritingSystem(i * 8 + j));
+                    currentByte >>= 1;
+                }
+            }
+
+            registerFont(fontName,QString(),fontWeight,fontStyle,100,true,false,pixelSize,writingSystems,handle);
+        }
+    } else {
+        qDebug() << "header verification of QPF2 font failed. maybe it is corrupt?";
+    }
+}
+
+void QPlatformFontDatabase::registerFont(const QString &familyname, const QString &foundryname, int weight,
+                                         QFont::Style style, int stretch, bool antialiased, bool scalable, int pixelSize,
+                                         const QSupportedWritingSystems &writingSystems, void *usrPtr)
+{
+    if (scalable)
+        pixelSize = 0;
+    qt_registerFont(familyname,foundryname,weight,style,stretch,antialiased,scalable,pixelSize,writingSystems,usrPtr);
+}
+
+class QWritingSystemsPrivate
+{
+public:
+    QWritingSystemsPrivate()
+        : ref(1)
+        , vector(QFontDatabase::WritingSystemsCount,false)
+    {
+    }
+
+    QWritingSystemsPrivate(const QWritingSystemsPrivate *other)
+        : ref(1)
+        , vector(other->vector)
+    {
+    }
+
+    QAtomicInt ref;
+    QVector<bool> vector;
+};
+
+QSupportedWritingSystems::QSupportedWritingSystems()
+{
+    d = new QWritingSystemsPrivate;
+}
+
+QSupportedWritingSystems::QSupportedWritingSystems(const QSupportedWritingSystems &other)
+{
+    d = other.d;
+    d->ref.ref();
+}
+
+QSupportedWritingSystems &QSupportedWritingSystems::operator=(const QSupportedWritingSystems &other)
+{
+    if (d != other.d) {
+        other.d->ref.ref();
+        if (!d->ref.deref())
+            delete d;
+        d = other.d;
+    }
+    return *this;
+}
+
+QSupportedWritingSystems::~QSupportedWritingSystems()
+{
+    if (!d->ref.deref())
+        delete d;
+}
+
+void QSupportedWritingSystems::detach()
+{
+    if (d->ref != 1) {
+        QWritingSystemsPrivate *newd = new QWritingSystemsPrivate(d);
+        if (!d->ref.deref())
+            delete d;
+        d = newd;
+    }
+}
+
+void QSupportedWritingSystems::setSupported(QFontDatabase::WritingSystem writingSystem, bool support)
+{
+    detach();
+    d->vector[writingSystem] = support;
+}
+
+bool QSupportedWritingSystems::supported(QFontDatabase::WritingSystem writingSystem) const
+{
+    return d->vector.at(writingSystem);
+}
+
+void 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("*.qpf2"));
+    dir.refresh();
+    for (int i = 0; i < int(dir.count()); ++i) {
+        const QByteArray fileName = QFile::encodeName(dir.absoluteFilePath(dir[i]));
+        QFile file(QString::fromLocal8Bit(fileName));
+        if (file.open(QFile::ReadOnly)) {
+            const QByteArray fileData = file.readAll();
+            QByteArray *fileDataPtr = new QByteArray(fileData);
+            registerQPF2Font(fileData, fileDataPtr);
+        }
+    }
+}
+
+QFontEngine *QPlatformFontDatabase::fontEngine(const QFontDef &fontDef, QUnicodeTables::Script script, void *handle)
+{
+    Q_UNUSED(script);
+    Q_UNUSED(handle);
+    QByteArray *fileDataPtr = static_cast<QByteArray *>(handle);
+    QFontEngineQPA *engine = new QFontEngineQPA(fontDef,*fileDataPtr);
+    qDebug() << fontDef.pixelSize << fontDef.weight << fontDef.style << fontDef.stretch << fontDef.styleHint << fontDef.styleStrategy << fontDef.family << script;
+    return engine;
+}
+
+QStringList QPlatformFontDatabase::fallbacksForFamily(const QString family, const QFont::Style &style, const QUnicodeTables::Script &script) const
+{
+    Q_UNUSED(family);
+    Q_UNUSED(style);
+    Q_UNUSED(script);
+    return QStringList();
+}
+
+void QPlatformFontDatabase::addApplicationFont(const QByteArray &fontData, const QString &fileName)
+{
+    Q_UNUSED(fontData);
+    Q_UNUSED(fileName);
+
+    qWarning("This plugin does not support application fonts");
+}
+
+void QPlatformFontDatabase::releaseHandle(void *handle)
+{
+    QByteArray *fileDataPtr = static_cast<QByteArray *>(handle);
+    delete fileDataPtr;
+}
+
+QString QPlatformFontDatabase::fontDir() const
+{
+    QString fontpath = QString::fromLocal8Bit(qgetenv("QT_QPA_FONTDIR"));
+    if (fontpath.isEmpty()) {
+#ifndef QT_NO_SETTINGS
+        fontpath = QLibraryInfo::location(QLibraryInfo::LibrariesPath);
+        fontpath += QLatin1String("/fonts");
+#endif
+    }
+
+    return fontpath;
+}
+
+QT_END_NAMESPACE