[KPhotoAlbum] Latest patch

[Robert L Krawitz]

   From: "Jesper K. Pedersen" <blackie at blackie.dk>
   Date: Sun, 9 Jul 2006 13:03:00 +0200

   Finally, I loaded in a big image, and zoomed out of it till it was
   smaller than the screen, and suddenly my computer froze, could you
   please check if we end up creating huge pixmaps to show them really
   tiny, or what goes on here.

This solves that problem.

BTW, I'm not going to have a chance to do much more work on this for a
while -- I'm going to be out all afternoon and then it's back to work.

void Viewer::DisplayArea::cropAndScale()
{
    ViewPreloadInfo* info = _cache[_curIndex];

    if ( info && info->angle == _info->angle() ) {
        _croppedAndScaledImg = info->img;
        _zEnd = QPoint( info->size.width(), info->size.height() );
        _cachedView = true;
    }
    else {
        if ( _loadedImage.isNull() || _cachedView ) {
            return;
        }

        if ( _zStart != QPoint(0,0) || _zEnd != QPoint( _loadedImage.width(), _loadedImage.height() ) ) {
	    QPoint zSpan = _zEnd - _zStart;
	    if (zSpan.x() > width() && zSpan.y() > height() &&
		zSpan.x() > _loadedImage.width() &&
		zSpan.y() > _loadedImage.height()) {
	      double wRatio = zSpan.x() / (double) width();
	      double hRatio = zSpan.y() / (double) height();
	      double ratio = wRatio > hRatio ? wRatio : hRatio;
	      int dWidth = (int) (_loadedImage.width() / ratio);
	      int dHeight = (int) (_loadedImage.height() / ratio);
	      QImage tImage = Utilities::scaleImage(_loadedImage,
						    dWidth, dHeight,
						    QImage::ScaleMin);
	      
	      _croppedAndScaledImg = tImage.copy( (int) (_zStart.x() / ratio),
						  (int) (_zStart.y() / ratio),
						  (int) (zSpan.x() / ratio),
						  (int) (zSpan.y() / ratio));
	    } else {
	      _croppedAndScaledImg = _loadedImage.copy( _zStart.x(), _zStart.y(), _zEnd.x() - _zStart.x(), _zEnd.y() - _zStart.y() );
	    }
        }
        else
            _croppedAndScaledImg = _loadedImage;

        if ( !_croppedAndScaledImg.isNull() )  // I don't know how this can happen, but it seems not to be dangerous.
	    _croppedAndScaledImg = Utilities::scaleImage(_croppedAndScaledImg, width(), height(), QImage::ScaleMin);
    }

    drawAll();
}