qimagescale_p.h File Reference

#include <qimage.h>

Go to the source code of this file.

Functions
QImage	qSmoothScaleImage (const QImage &img, int w, int h)

Function Documentation

qSmoothScaleImage()

QImage qSmoothScaleImage	(	const QImage &	img,
		int	w,
		int	h
	)

Definition at line 1000 of file qimagescale.cpp.

Referenced by smoothScaled().

{
    QImage buffer;
    if (src.isNull() || dw <= 0 || dh <= 0)
        return buffer;

    int w = src.width();
    int h = src.height();
    QImageScaleInfo *scaleinfo =
        qimageCalcScaleInfo(src, w, h, dw, dh, true);
    if (!scaleinfo)
        return buffer;

    buffer = QImage(dw, dh, src.format());
    if (buffer.isNull()) {
        qWarning("QImage: out of memory, returning null");
        qimageFreeScaleInfo(scaleinfo);
        return QImage();
    }

    if (src.format() == QImage::Format_ARGB32_Premultiplied)
        qt_qimageScaleArgb(scaleinfo, (unsigned int *)buffer.scanLine(0),
                           0, 0, 0, 0, dw, dh, dw, src.bytesPerLine() / 4);
    else
        qt_qimageScaleRgb(scaleinfo, (unsigned int *)buffer.scanLine(0),
                          0, 0, 0, 0, dw, dh, dw, src.bytesPerLine() / 4);

    qimageFreeScaleInfo(scaleinfo);
    return buffer;
}