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< td align = "right" valign = "center" > < img src = "logo32.png" align = "right" width = "64" height = "32" border = "0" > < / td > < / tr > < / table > < h1 align = center > TQPNGImagePacker Class Reference< / h1 >
< p > The TQPNGImagePacker class creates well-compressed PNG animations.
< a href = "#details" > More...< / a >
< p > < tt > #include < < a href = "qpngio-h.html" > ntqpngio.h< / a > > < / tt >
< p > < a href = "qpngimagepacker-members.html" > List of all member functions.< / a >
< h2 > Public Members< / h2 >
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< li class = fn > < a href = "#TQPNGImagePacker" > < b > TQPNGImagePacker< / b > < / a > ( TQIODevice * iod, int storage_depth, int conversionflags )< / li >
< li class = fn > void < a href = "#setPixelAlignment" > < b > setPixelAlignment< / b > < / a > ( int x )< / li >
< li class = fn > bool < a href = "#packImage" > < b > packImage< / b > < / a > ( const TQImage & img )< / li >
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< hr > < a name = "details" > < / a > < h2 > Detailed Description< / h2 >
The TQPNGImagePacker class creates well-compressed PNG animations.
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< p > By using transparency, TQPNGImagePacker allows you to build a PNG
image from a sequence of TQImages.
< p > Images are added using < a href = "#packImage" > packImage< / a > ().
< p > See also < a href = "graphics.html" > Graphics Classes< / a > and < a href = "images.html" > Image Processing Classes< / a > .
< hr > < h2 > Member Function Documentation< / h2 >
< h3 class = fn > < a name = "TQPNGImagePacker" > < / a > TQPNGImagePacker::TQPNGImagePacker ( < a href = "ntqiodevice.html" > TQIODevice< / a > * iod, int storage_depth, int conversionflags )
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Creates an image packer that writes PNG data to IO device < em > iod< / em >
using a < em > storage_depth< / em > bit encoding (use 8 or 32, depending on
the desired quality and compression requirements).
< p > 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 < em > conversionflags< / em > to specify how you'd prefer this to happen.
< p > < p > See also < a href = "ntqt.html#ImageConversionFlags-enum" > TQt::ImageConversionFlags< / a > .
< h3 class = fn > bool < a name = "packImage" > < / a > TQPNGImagePacker::packImage ( const < a href = "tqimage.html" > TQImage< / a > & img )
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Adds the image < em > img< / em > to the PNG animation, analyzing the
differences between this and the previous image to improve
compression.
< h3 class = fn > void < a name = "setPixelAlignment" > < / a > TQPNGImagePacker::setPixelAlignment ( int x )
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Aligns pixel differences to < em > x< / em > 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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