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

1 files changed, 189 insertions, 0 deletions

diff --git a/src/gui/painting/qtextureglyphcache_p.h b/src/gui/painting/qtextureglyphcache_p.h
new file mode 100644
index 0000000000..922e2901bd
--- /dev/null
+++ b/src/gui/painting/qtextureglyphcache_p.h
@@ -0,0 +1,189 @@
+/****************************************************************************
+**
+** 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QTEXTUREGLYPHCACHE_P_H
+#define QTEXTUREGLYPHCACHE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of other Qt classes.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <qhash.h>
+#include <qimage.h>
+#include <qobject.h>
+#include <qtransform.h>
+
+#include <private/qfontengineglyphcache_p.h>
+
+#if defined(Q_OS_VXWORKS) && defined(m_type)
+#  undef m_type
+#endif
+
+#ifndef QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH
+#define QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH 256
+#endif
+
+struct glyph_metrics_t;
+typedef unsigned int glyph_t;
+
+
+QT_BEGIN_NAMESPACE
+
+class QTextItemInt;
+
+class Q_GUI_EXPORT QTextureGlyphCache : public QFontEngineGlyphCache
+{
+public:
+    QTextureGlyphCache(QFontEngineGlyphCache::Type type, const QTransform &matrix)
+        : QFontEngineGlyphCache(matrix, type), m_current_fontengine(0),
+                                               m_w(0), m_h(0), m_cx(0), m_cy(0), m_currentRowHeight(0), m_subPixelPositionCount(0)
+        { }
+
+    virtual ~QTextureGlyphCache() { }
+
+    struct GlyphAndSubPixelPosition
+    {
+        GlyphAndSubPixelPosition(glyph_t g, QFixed spp) : glyph(g), subPixelPosition(spp) {}
+
+        bool operator==(const GlyphAndSubPixelPosition &other) const
+        {
+            return glyph == other.glyph && subPixelPosition == other.subPixelPosition;
+        }
+
+        glyph_t glyph;
+        QFixed subPixelPosition;
+    };
+
+    struct Coord {
+        int x;
+        int y;
+        int w;
+        int h;
+
+        int baseLineX;
+        int baseLineY;
+
+        bool isNull() const
+        {
+            return w == 0 || h == 0;
+        }
+    };
+
+    bool populate(QFontEngine *fontEngine, int numGlyphs, const glyph_t *glyphs,
+                  const QFixedPoint *positions);
+    void fillInPendingGlyphs();
+
+    virtual void createTextureData(int width, int height) = 0;
+    virtual void resizeTextureData(int width, int height) = 0;
+    virtual int glyphMargin() const { return 0; }
+    virtual int glyphPadding() const { return 0; }
+
+    virtual void fillTexture(const Coord &coord, glyph_t glyph, QFixed subPixelPosition) = 0;
+
+    inline void createCache(int width, int height) {
+        m_w = width;
+        m_h = height;
+        createTextureData(width, height);
+    }
+
+    inline void resizeCache(int width, int height)
+    {
+        resizeTextureData(width, height);
+        m_w = width;
+        m_h = height;
+    }
+
+    inline bool isNull() const { return m_h == 0; }
+
+    QHash<GlyphAndSubPixelPosition, Coord> coords;
+    virtual int maxTextureWidth() const { return QT_DEFAULT_TEXTURE_GLYPH_CACHE_WIDTH; }
+    virtual int maxTextureHeight() const { return -1; }
+
+    QImage textureMapForGlyph(glyph_t g, QFixed subPixelPosition) const;
+
+    QFixed subPixelPositionForX(QFixed x) const;
+
+protected:
+    int calculateSubPixelPositionCount(glyph_t) const;
+
+    QFontEngine *m_current_fontengine;
+    QHash<GlyphAndSubPixelPosition, Coord> m_pendingGlyphs;
+
+    int m_w; // image width
+    int m_h; // image height
+    int m_cx; // current x
+    int m_cy; // current y
+    int m_currentRowHeight; // Height of last row
+    int m_subPixelPositionCount; // Number of positions within a single pixel for this cache
+};
+
+inline uint qHash(const QTextureGlyphCache::GlyphAndSubPixelPosition &g)
+{
+    return (g.glyph << 8)  | (g.subPixelPosition * 10).round().toInt();
+}
+
+
+class Q_GUI_EXPORT QImageTextureGlyphCache : public QTextureGlyphCache
+{
+public:
+    QImageTextureGlyphCache(QFontEngineGlyphCache::Type type, const QTransform &matrix)
+        : QTextureGlyphCache(type, matrix) { }
+    virtual int glyphMargin() const;
+    virtual void createTextureData(int width, int height);
+    virtual void resizeTextureData(int width, int height);
+    virtual void fillTexture(const Coord &c, glyph_t glyph, QFixed subPixelPosition);
+
+    inline const QImage &image() const { return m_image; }
+
+private:
+    QImage m_image;
+};
+
+QT_END_NAMESPACE
+
+#endif