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/****************************************************************************
**
** 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
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