qtextureglyphcache_p.h

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// Copyright (C) 2016 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

// Qt-Security score:significant reason:default

#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, const QColor &color = QColor())

        : QFontEngineGlyphCache(format, matrix, color), m_current_fontengine(nullptr),

                                               m_w(0), m_h(0), m_cx(0), m_cy(0), m_currentRowHeight(0)

{ }

    ~QTextureGlyphCache();

    struct GlyphAndSubPixelPosition

        GlyphAndSubPixelPosition(glyph_t g, const QFixedPoint &spp)

            : glyph(g), subPixelPosition(spp) {}

        bool operator==(const GlyphAndSubPixelPosition &other) const

            return glyph == other.glyph && subPixelPosition == other.subPixelPosition;

        glyph_t glyph;

        QFixedPoint 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,

                  qsizetype numGlyphs,

                  const glyph_t *glyphs,

                  const QFixedPoint *positions,

                  QPainter::RenderHints renderHints = QPainter::RenderHints(),

                  bool includeGlyphCacheScale = false);

    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,

                             const QFixedPoint &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, const QFixedPoint &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 size_t qHash(const QTextureGlyphCache::GlyphAndSubPixelPosition &g, size_t seed = 0)

    return qHashMulti(seed,

                      g.glyph,

                      g.subPixelPosition.x.value(),

                      g.subPixelPosition.y.value());

class Q_GUI_EXPORT QImageTextureGlyphCache : public QTextureGlyphCache

public:

    QImageTextureGlyphCache(QFontEngine::GlyphFormat format, const QTransform &matrix, const QColor &color = QColor())

        : QTextureGlyphCache(format, matrix, color) { }

    ~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,

                             const QFixedPoint &subPixelPosition) override;

    inline const QImage &image() const { return m_image; }

private:

    QImage m_image;

};

QT_END_NAMESPACE

#endif