QPNGImagePacker

NAME

QPNGImagePacker - Creates well-compressed PNG animations

SYNOPSIS

#include <qpngio.h>

Public Members

<li class=fn>QPNGImagePacker ( QIODevice * iod, int storage_depth, int conversionflags ) <li class=fn>void setPixelAlignment ( int x ) <li class=fn>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.

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.

COPYRIGHT

AUTHOR

Generated automatically from the source code.

BUGS

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