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QPNGImagePacker Class Reference
The QPNGImagePacker class creates well-compressed PNG animations. More...
#include <qpngio.h>
Public Members
- QPNGImagePacker ( QIODevice * iod, int storage_depth, int conversionflags )
- void setPixelAlignment ( int x )
- bool packImage ( const QImage & img )
Detailed 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.This file is part of the Qt toolkit. Copyright © 1995-2002 Trolltech. All Rights Reserved.
| Copyright © 2002 Trolltech | Trademarks | Qt version 3.0.5
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