Support QRawFont from raw data with basic unix font db

Add support for making a QFontEngine in QPA with the basic
unix font database. The code is copy-pasted from qrawfont_ft.cpp.

Task-number: QTBUG-20780

Change-Id: Id5492efe634fe90805fbca43356ec428d4d73117
Reviewed-on: http://codereview.qt.nokia.com/3511
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jiang Jiang <jiang.jiang@nokia.com>

2 files changed, 67 insertions, 0 deletions

diff --git a/src/platformsupport/fontdatabases/basicunix/qbasicunixfontdatabase.cpp b/src/platformsupport/fontdatabases/basicunix/qbasicunixfontdatabase.cpp
index 5a0c0492c1..ee4bf26bb0 100644
--- a/src/platformsupport/fontdatabases/basicunix/qbasicunixfontdatabase.cpp
+++ b/src/platformsupport/fontdatabases/basicunix/qbasicunixfontdatabase.cpp
@@ -47,6 +47,7 @@
 #include <QtCore/QFile>
 #include <QtCore/QLibraryInfo>
 #include <QtCore/QDir>
+#include <QtCore/QUuid>
 
 #undef QT_NO_FREETYPE
 #include <QtGui/private/qfontengine_ft_p.h>
@@ -237,6 +238,71 @@ QFontEngine *QBasicUnixFontDatabase::fontEngine(const QFontDef &fontDef, QUnicod
     return engine;
 }
 
+namespace {
+
+    class QFontEngineFTRawData: public QFontEngineFT
+    {
+    public:
+        QFontEngineFTRawData(const QFontDef &fontDef) : QFontEngineFT(fontDef)
+        {
+        }
+
+        void updateFamilyNameAndStyle()
+        {
+            fontDef.family = QString::fromAscii(freetype->face->family_name);
+
+            if (freetype->face->style_flags & FT_STYLE_FLAG_ITALIC)
+                fontDef.style = QFont::StyleItalic;
+
+            if (freetype->face->style_flags & FT_STYLE_FLAG_BOLD)
+                fontDef.weight = QFont::Bold;
+        }
+
+        bool initFromData(const QByteArray &fontData)
+        {
+            FaceId faceId;
+            faceId.filename = "";
+            faceId.index = 0;
+            faceId.uuid = QUuid::createUuid().toByteArray();
+
+            return init(faceId, true, Format_None, fontData);
+        }
+    };
+
+}
+
+QFontEngine *QBasicUnixFontDatabase::fontEngine(const QByteArray &fontData, qreal pixelSize,
+                                                QFont::HintingPreference hintingPreference)
+{
+    QFontDef fontDef;
+    fontDef.pixelSize = pixelSize;
+
+    QFontEngineFTRawData *fe = new QFontEngineFTRawData(fontDef);
+    if (!fe->initFromData(fontData)) {
+        delete fe;
+        return 0;
+    }
+
+    fe->updateFamilyNameAndStyle();
+
+    switch (hintingPreference) {
+    case QFont::PreferNoHinting:
+        fe->setDefaultHintStyle(QFontEngineFT::HintNone);
+        break;
+    case QFont::PreferFullHinting:
+        fe->setDefaultHintStyle(QFontEngineFT::HintFull);
+        break;
+    case QFont::PreferVerticalHinting:
+        fe->setDefaultHintStyle(QFontEngineFT::HintLight);
+        break;
+    default:
+        // Leave it as it is
+        break;
+    }
+
+    return fe;
+}
+
 QStringList QBasicUnixFontDatabase::fallbacksForFamily(const QString family, const QFont::Style &style, const QFont::StyleHint &styleHint, const QUnicodeTables::Script &script) const
 {
     Q_UNUSED(family);
diff --git a/src/platformsupport/fontdatabases/basicunix/qbasicunixfontdatabase_p.h b/src/platformsupport/fontdatabases/basicunix/qbasicunixfontdatabase_p.h
index 9e5c3f0aa6..13c931fac7 100644
--- a/src/platformsupport/fontdatabases/basicunix/qbasicunixfontdatabase_p.h
+++ b/src/platformsupport/fontdatabases/basicunix/qbasicunixfontdatabase_p.h
@@ -61,6 +61,7 @@ class QBasicUnixFontDatabase : public QPlatformFontDatabase
 public:
     void populateFontDatabase();
     QFontEngine *fontEngine(const QFontDef &fontDef, QUnicodeTables::Script script, void *handle);
+    QFontEngine *fontEngine(const QByteArray &fontData, qreal pixelSize, QFont::HintingPreference hintingPreference);
     QStringList fallbacksForFamily(const QString family, const QFont::Style &style, const QFont::StyleHint &styleHint, const QUnicodeTables::Script &script) const;
     QStringList addApplicationFont(const QByteArray &fontData, const QString &fileName);
     void releaseHandle(void *handle);