qabstractfontengine_qws.cpp File Reference

#include "qabstractfontengine_qws.h"
#include "qabstractfontengine_p.h"
#include <private/qtextengine_p.h>
#include <private/qpaintengine_raster_p.h>
#include <qmath.h>

Go to the source code of this file.

Classes
class	QAbstractFontEnginePrivate
class	QFontEngineInfoPrivate
class	QFontEnginePluginPrivate

Functions
static QImage	alphaMapFromPath (QFontEngine *fe, glyph_t glyph)

Function Documentation

alphaMapFromPath()

static QImage alphaMapFromPath ( QFontEngine *  fe, glyph_t  glyph  )

static

Definition at line 628 of file qabstractfontengine_qws.cpp.

Referenced by QProxyFontEngine::alphaMapForGlyph().

{
    glyph_metrics_t gm = fe->boundingBox(glyph);
    int glyph_x = qFloor(gm.x.toReal());
    int glyph_y = qFloor(gm.y.toReal());
    int glyph_width = qCeil((gm.x + gm.width).toReal()) -  glyph_x;
    int glyph_height = qCeil((gm.y + gm.height).toReal()) - glyph_y;

    if (glyph_width <= 0 || glyph_height <= 0)
        return QImage();
    QFixedPoint pt;
    pt.x = 0;
    pt.y = -glyph_y; // the baseline
    QPainterPath path;
    QImage im(glyph_width + qAbs(glyph_x) + 4, glyph_height, QImage::Format_ARGB32_Premultiplied);
    im.fill(Qt::transparent);
    QPainter p(&im);
    p.setRenderHint(QPainter::Antialiasing);
    fe->addGlyphsToPath(&glyph, &pt, 1, &path, 0);
    p.setPen(Qt::NoPen);
    p.setBrush(Qt::black);
    p.drawPath(path);
    p.end();

    QImage indexed(im.width(), im.height(), QImage::Format_Indexed8);
    QVector<QRgb> colors(256);
    for (int i=0; i<256; ++i)
        colors[i] = qRgba(0, 0, 0, i);
    indexed.setColorTable(colors);

    for (int y=0; y<im.height(); ++y) {
        uchar *dst = (uchar *) indexed.scanLine(y);
        uint *src = (uint *) im.scanLine(y);
        for (int x=0; x<im.width(); ++x)
            dst[x] = qAlpha(src[x]);
    }

    return indexed;
}