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.
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