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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtGui module 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 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 <QtGui/private/qtguiglobal_p.h>
#include <qhash.h>
#include <qimage.h>
#include <qobject.h>
#include <qtransform.h>
#include <private/qfontengineglyphcache_p.h>
#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(QFontEngine::GlyphFormat format, const QTransform &matrix)
: QFontEngineGlyphCache(format, matrix), m_current_fontengine(0),
m_w(0), m_h(0), m_cx(0), m_cy(0), m_currentRowHeight(0)
{ }
~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);
bool hasPendingGlyphs() const { return !m_pendingGlyphs.isEmpty(); };
void fillInPendingGlyphs();
virtual void createTextureData(int width, int height) = 0;
virtual void resizeTextureData(int width, int height) = 0;
virtual int glyphPadding() const { return 0; }
virtual void beginFillTexture() { }
virtual void fillTexture(const Coord &coord, glyph_t glyph, QFixed subPixelPosition) = 0;
virtual void endFillTexture() { }
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;
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
};
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(QFontEngine::GlyphFormat format, const QTransform &matrix)
: QTextureGlyphCache(format, matrix) { }
~QImageTextureGlyphCache();
virtual void createTextureData(int width, int height) override;
virtual void resizeTextureData(int width, int height) override;
virtual void fillTexture(const Coord &c, glyph_t glyph, QFixed subPixelPosition) override;
inline const QImage &image() const { return m_image; }
private:
QImage m_image;
};
QT_END_NAMESPACE
#endif
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