qpngimagepacker.3qt - Man Page

Creates well-compressed PNG animations


#include <qpngio.h>

Public Members

QPNGImagePacker ( QIODevice * iod, int storage_depth, int conversionflags )
void setPixelAlignment ( int x )
bool packImage ( const QImage & img )


The QPNGImagePacker class creates well-compressed PNG animations.

By using transparency, QPNGImagePacker allows you to build a PNG image from a sequence of QImages.

Images are added using packImage().

See also Graphics Classes and Image Processing Classes.

Member Function Documentation

QPNGImagePacker::QPNGImagePacker ( QIODevice * iod, int storage_depth, int conversionflags )

Creates an image packer that writes PNG data to IO device iod using a storage_depth bit encoding (use 8 or 32, depending on the desired quality and compression requirements).

If the image needs to be modified to fit in a lower-resolution result (e.g. converting from 32-bit to 8-bit), use the conversionflags to specify how you'd prefer this to happen.

See also Qt::ImageConversionFlags.

bool QPNGImagePacker::packImage ( const QImage & img )

Adds the image img to the PNG animation, analyzing the differences between this and the previous image to improve compression.

void QPNGImagePacker::setPixelAlignment ( int x )

Aligns pixel differences to x pixels. For example, using 8 can improve playback on certain hardware. Normally the default of 1-pixel alignment (i.e. no alignment) gives better compression and performance.

See Also

http://doc.trolltech.com/qpngimagepacker.html http://www.trolltech.com/faq/tech.html


Generated automatically from the source code.


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Referenced By

The man page QPNGImagePacker.3qt(3) is an alias of qpngimagepacker.3qt(3).

2 February 2007 Trolltech AS