QImageTextureGlyphCache Class Reference

#include <qtextureglyphcache_p.h>

Inheritance diagram for QImageTextureGlyphCache:

Public Functions
virtual void	createTextureData (int width, int height)
virtual void	fillTexture (const Coord &c, glyph_t glyph, QFixed subPixelPosition)
virtual int	glyphMargin () const
const QImage &	image () const
	QImageTextureGlyphCache (QFontEngineGlyphCache::Type type, const QTransform &matrix)
virtual void	resizeTextureData (int width, int height)
Public Functions inherited from QTextureGlyphCache
void	createCache (int width, int height)
void	fillInPendingGlyphs ()
virtual int	glyphPadding () const
bool	isNull () const
virtual int	maxTextureHeight () const
virtual int	maxTextureWidth () const
bool	populate (QFontEngine *fontEngine, int numGlyphs, const glyph_t *glyphs, const QFixedPoint *positions)
	QTextureGlyphCache (QFontEngineGlyphCache::Type type, const QTransform &matrix)
void	resizeCache (int width, int height)
QFixed	subPixelPositionForX (QFixed x) const
QImage	textureMapForGlyph (glyph_t g, QFixed subPixelPosition) const
virtual	~QTextureGlyphCache ()
Public Functions inherited from QFontEngineGlyphCache
Type	cacheType () const
	QFontEngineGlyphCache (const QTransform &matrix, Type type)
virtual	~QFontEngineGlyphCache ()
Public Functions inherited from QSharedData
	QSharedData ()
	Constructs a QSharedData object with a reference count of 0. More...
	QSharedData (const QSharedData &)
	Constructs a QSharedData object with reference count 0. More...

Properties
QImage	m_image

Additional Inherited Members
Public Types inherited from QFontEngineGlyphCache
enum	Type { Raster_RGBMask, Raster_A8, Raster_Mono }
Public Variables inherited from QTextureGlyphCache
QHash< GlyphAndSubPixelPosition, Coord >	coords
Public Variables inherited from QFontEngineGlyphCache
QTransform	m_transform
QFontEngineGlyphCache::Type	m_type
Public Variables inherited from QSharedData
QAtomicInt	ref
Protected Functions inherited from QTextureGlyphCache
int	calculateSubPixelPositionCount (glyph_t) const
Protected Variables inherited from QTextureGlyphCache
QFontEngine *	m_current_fontengine
int	m_currentRowHeight
int	m_cx
int	m_cy
int	m_h
QHash< GlyphAndSubPixelPosition, Coord >	m_pendingGlyphs
int	m_subPixelPositionCount
int	m_w

Detailed Description

Definition at line 171 of file qtextureglyphcache_p.h.

Constructors and Destructors

QImageTextureGlyphCache()

QImageTextureGlyphCache::QImageTextureGlyphCache ( QFontEngineGlyphCache::Type  type, const QTransform &  matrix  )

inline

Definition at line 174 of file qtextureglyphcache_p.h.

        : QTextureGlyphCache(type, matrix) { }

Functions

createTextureData()

void QImageTextureGlyphCache::createTextureData ( int  width, int  height  )

virtual

Implements QTextureGlyphCache.

Reimplemented in QGLTextureGlyphCache.

Definition at line 347 of file qtextureglyphcache.cpp.

Referenced by QGLTextureGlyphCache::createTextureData().

{
    switch (m_type) {
    case QFontEngineGlyphCache::Raster_Mono:
        m_image = QImage(width, height, QImage::Format_Mono);
        break;
    case QFontEngineGlyphCache::Raster_A8: {
        m_image = QImage(width, height, QImage::Format_Indexed8);
        m_image.fill(0);
        QVector<QRgb> colors(256);
        QRgb *it = colors.data();
        for (int i=0; i<256; ++i, ++it)
            *it = 0xff000000 | i | (i<<8) | (i<<16);
        m_image.setColorTable(colors);
        break;   }
    case QFontEngineGlyphCache::Raster_RGBMask:
        m_image = QImage(width, height, QImage::Format_RGB32);
        break;
    }
}

fillTexture()

void QImageTextureGlyphCache::fillTexture ( const Coord &  c, glyph_t  glyph, QFixed  subPixelPosition  )

virtual

Implements QTextureGlyphCache.

Reimplemented in QGLTextureGlyphCache.

Definition at line 377 of file qtextureglyphcache.cpp.

Referenced by QGLTextureGlyphCache::fillTexture().

{
    QImage mask = textureMapForGlyph(g, subPixelPosition);

#ifdef CACHE_DEBUG
    printf("fillTexture of %dx%d at %d,%d in the cache of %dx%d\n", c.w, c.h, c.x, c.y, m_image.width(), m_image.height());
    if (mask.width() > c.w || mask.height() > c.h) {
        printf("   ERROR; mask is bigger than reserved space! %dx%d instead of %dx%d\n", mask.width(), mask.height(), c.w,c.h);
        return;
    }
#endif

    if (m_type == QFontEngineGlyphCache::Raster_RGBMask) {
        QImage ref(m_image.bits() + (c.x * 4 + c.y * m_image.bytesPerLine()),
                   qMax(mask.width(), c.w), qMax(mask.height(), c.h), m_image.bytesPerLine(),
                   m_image.format());
        QPainter p(&ref);
        p.setCompositionMode(QPainter::CompositionMode_Source);
        p.fillRect(0, 0, c.w, c.h, QColor(0,0,0,0)); // TODO optimize this
        p.drawImage(0, 0, mask);
        p.end();
    } else if (m_type == QFontEngineGlyphCache::Raster_Mono) {
        if (mask.depth() > 1) {
            // TODO optimize this
            mask = mask.alphaChannel();
            mask.invertPixels();
            mask = mask.convertToFormat(QImage::Format_Mono);
        }

        int mw = qMin(mask.width(), c.w);
        int mh = qMin(mask.height(), c.h);
        uchar *d = m_image.bits();
        int dbpl = m_image.bytesPerLine();

        for (int y = 0; y < c.h; ++y) {
            uchar *dest = d + (c.y + y) *dbpl + c.x/8;

            if (y < mh) {
                uchar *src = mask.scanLine(y);
                for (int x = 0; x < c.w/8; ++x) {
                    if (x < (mw+7)/8)
                        dest[x] = src[x];
                    else
                        dest[x] = 0;
                }
            } else {
                for (int x = 0; x < c.w/8; ++x)
                    dest[x] = 0;
            }
        }
    } else { // A8
        int mw = qMin(mask.width(), c.w);
        int mh = qMin(mask.height(), c.h);
        uchar *d = m_image.bits();
        int dbpl = m_image.bytesPerLine();

        if (mask.depth() == 1) {
            for (int y = 0; y < c.h; ++y) {
                uchar *dest = d + (c.y + y) *dbpl + c.x;
                if (y < mh) {
                    uchar *src = (uchar *) mask.scanLine(y);
                    for (int x = 0; x < c.w; ++x) {
                        if (x < mw)
                            dest[x] = (src[x >> 3] & (1 << (7 - (x & 7)))) > 0 ? 255 : 0;
                    }
                }
            }
        } else if (mask.depth() == 8) {
            for (int y = 0; y < c.h; ++y) {
                uchar *dest = d + (c.y + y) *dbpl + c.x;
                if (y < mh) {
                    uchar *src = (uchar *) mask.scanLine(y);
                    for (int x = 0; x < c.w; ++x) {
                        if (x < mw)
                            dest[x] = src[x];
                    }
                }
            }
        }
    }

#ifdef CACHE_DEBUG
//     QPainter p(&m_image);
//     p.drawLine(
    QPoint base(c.x + glyphMargin(), c.y + glyphMargin() + c.baseLineY-1);
    if (m_image.rect().contains(base))
        m_image.setPixel(base, 255);
    m_image.save(QString::fromLatin1("cache-%1.png").arg(qint64(this)));
#endif
}

glyphMargin()

int QImageTextureGlyphCache::glyphMargin ( ) const

virtual

Reimplemented from QTextureGlyphCache.

Definition at line 368 of file qtextureglyphcache.cpp.

Referenced by QGL2PaintEngineExPrivate::drawCachedGlyphs(), and QRasterPaintEngine::drawCachedGlyphs().

{
#if (defined(Q_WS_MAC) && defined(QT_MAC_USE_COCOA)) || defined(Q_WS_X11)
    return 0;
#else
    return m_type == QFontEngineGlyphCache::Raster_RGBMask ? 2 : 0;
#endif
}

image()

const QImage& QImageTextureGlyphCache::image ( ) const

inline

Definition at line 181 of file qtextureglyphcache_p.h.

Referenced by QGLTextureGlyphCache::createTextureData(), QRasterPaintEngine::drawCachedGlyphs(), QGLTextureGlyphCache::fillTexture(), and QGLTextureGlyphCache::resizeTextureData().

{ return m_image; }

resizeTextureData()

void QImageTextureGlyphCache::resizeTextureData ( int  width, int  height  )

virtual

Implements QTextureGlyphCache.

Reimplemented in QGLTextureGlyphCache.

Definition at line 342 of file qtextureglyphcache.cpp.

Referenced by QGLTextureGlyphCache::resizeTextureData().

{
    m_image = m_image.copy(0, 0, width, height);
}

Properties

m_image

QImage QImageTextureGlyphCache::m_image

private

Definition at line 184 of file qtextureglyphcache_p.h.

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The documentation for this class was generated from the following files:

• /src/gui/painting/qtextureglyphcache_p.h
• /src/gui/painting/qtextureglyphcache.cpp