QPNGImagePacker

Section: Misc. Reference Manual Pages (3qt)
Updated: 2 February 2007
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NAME

QPNGImagePacker - Creates well-compressed PNG animations  

SYNOPSIS

#include <qpngio.h>

 

Public Members


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

void setPixelAlignment ( int x )

bool packImage ( const QImage & img )
 

DESCRIPTION

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  

COPYRIGHT

Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the license file included in the distribution for a complete license statement.  

AUTHOR

Generated automatically from the source code.  

BUGS

If you find a bug in Qt, please report it as described in http://doc.trolltech.com/bughowto.html. Good bug reports help us to help you. Thank you. The definitive Qt documentation is provided in HTML format; it is located at $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is provided as a convenience for those users who prefer man pages, although this format is not officially supported by Trolltech. If you find errors in this manual page, please report them to qt-bugs@trolltech.com. Please include the name of the manual page (qpngimagepacker.3qt) and the Qt version (3.3.8).