Move Windows font DB and engines to QtFontDatabaseSupport

This allows creating or extending QPA plugins to provide access to QFont
and related types.

It concerns both GDI and DirectWrite engines, as well as the regular and
the freetype based font databases. The qt.qpa.fonts logging category has
been moved together into the QWindowsFontDatabase related files to avoid
depending on the qwindowscontext.h header file. Finally, QwindowsNativeImage
is following pending a future refactor with similar code in qpixmap_win.cpp
and the Windows XP style.

Change-Id: Iddff2f3d715e3ab7695e6c2052b7596a01fd6fa8
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 160 insertions, 0 deletions

diff --git a/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_p.h b/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_p.h
new file mode 100644
index 0000000000..d240f77a66
--- /dev/null
+++ b/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_p.h
@@ -0,0 +1,160 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWINDOWSFONTDATABASE_H
+#define QWINDOWSFONTDATABASE_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <qpa/qplatformfontdatabase.h>
+#include <QtCore/QSharedPointer>
+#include <QtCore/QLoggingCategory>
+#include <QtCore/qt_windows.h>
+
+#if !defined(QT_NO_DIRECTWRITE)
+    struct IDWriteFactory;
+    struct IDWriteGdiInterop;
+#endif
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(lcQpaFonts)
+
+class QWindowsFontEngineData
+{
+    Q_DISABLE_COPY(QWindowsFontEngineData)
+public:
+    QWindowsFontEngineData();
+    ~QWindowsFontEngineData();
+
+    uint pow_gamma[256];
+
+    bool clearTypeEnabled;
+    qreal fontSmoothingGamma;
+    HDC hdc;
+#if !defined(QT_NO_DIRECTWRITE)
+    IDWriteFactory *directWriteFactory;
+    IDWriteGdiInterop *directWriteGdiInterop;
+#endif
+};
+
+class QWindowsFontDatabase : public QPlatformFontDatabase
+{
+public:
+    enum FontOptions {
+        // Relevant bits from QWindowsIntegration::Options
+        DontUseDirectWriteFonts = 0x40,
+        DontUseColorFonts = 0x80
+    };
+
+    QWindowsFontDatabase();
+    ~QWindowsFontDatabase();
+
+    void populateFontDatabase() Q_DECL_OVERRIDE;
+    void populateFamily(const QString &familyName) Q_DECL_OVERRIDE;
+    QFontEngineMulti *fontEngineMulti(QFontEngine *fontEngine, QChar::Script script) Q_DECL_OVERRIDE;
+    QFontEngine *fontEngine(const QFontDef &fontDef, void *handle) Q_DECL_OVERRIDE;
+    QFontEngine *fontEngine(const QByteArray &fontData, qreal pixelSize, QFont::HintingPreference hintingPreference) Q_DECL_OVERRIDE;
+    QStringList fallbacksForFamily(const QString &family, QFont::Style style, QFont::StyleHint styleHint, QChar::Script script) const Q_DECL_OVERRIDE;
+    QStringList addApplicationFont(const QByteArray &fontData, const QString &fileName) Q_DECL_OVERRIDE;
+    void releaseHandle(void *handle) Q_DECL_OVERRIDE;
+    QString fontDir() const Q_DECL_OVERRIDE;
+
+    QFont defaultFont() const  Q_DECL_OVERRIDE { return systemDefaultFont(); }
+    bool fontsAlwaysScalable() const Q_DECL_OVERRIDE;
+    void derefUniqueFont(const QString &uniqueFont);
+    void refUniqueFont(const QString &uniqueFont);
+
+    static QFont systemDefaultFont();
+
+    static QFontEngine *createEngine(const QFontDef &request,
+                                     int dpi,
+                                     const QSharedPointer<QWindowsFontEngineData> &data);
+
+    static HFONT systemFont();
+    static QFont LOGFONT_to_QFont(const LOGFONT& lf, int verticalDPI = 0);
+
+    static qreal fontSmoothingGamma();
+    static LOGFONT fontDefToLOGFONT(const QFontDef &fontDef);
+
+    static QStringList extraTryFontsForFamily(const QString &family);
+    static QString familyForStyleHint(QFont::StyleHint styleHint);
+
+    static int defaultVerticalDPI();
+
+    static void setFontOptions(unsigned options);
+    static unsigned fontOptions();
+
+private:
+    void populateFamily(const QString &familyName, bool registerAlias);
+    void removeApplicationFonts();
+
+    struct WinApplicationFont {
+        HANDLE handle;
+        QString fileName;
+    };
+
+    QList<WinApplicationFont> m_applicationFonts;
+
+    struct UniqueFontData {
+        HANDLE handle;
+        QAtomicInt refCount;
+    };
+
+    QMap<QString, UniqueFontData> m_uniqueFontData;
+
+    static unsigned m_fontOptions;
+};
+
+#ifndef QT_NO_DEBUG_STREAM
+QDebug operator<<(QDebug, const QFontDef &def);
+#endif
+
+QT_END_NAMESPACE
+
+#endif // QWINDOWSFONTDATABASE_H