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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>QPNGImagePacker Class Reference</h1>

<p>The QPNGImagePacker class creates well-compressed PNG animations.
<a href="#details">More...</a>
<p><tt>#include &lt;<a href="qpngio-h.html">qpngio.h</a>&gt;</tt>
<p><a href="qpngimagepacker-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#QPNGImagePacker"><b>QPNGImagePacker</b></a> ( QIODevice&nbsp;*&nbsp;iod, int&nbsp;storage_depth, int&nbsp;conversionflags )</li>
<li class=fn>void <a href="#setPixelAlignment"><b>setPixelAlignment</b></a> ( int&nbsp;x )</li>
<li class=fn>bool <a href="#packImage"><b>packImage</b></a> ( const&nbsp;QImage&nbsp;&amp;&nbsp;img )</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>


The QPNGImagePacker class creates well-compressed PNG animations.
<p> 

<p> By using transparency, QPNGImagePacker allows you to build a PNG
image from a sequence of QImages.
<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="QPNGImagePacker"></a>QPNGImagePacker::QPNGImagePacker ( <a href="qiodevice.html">QIODevice</a>&nbsp;*&nbsp;iod, int&nbsp;storage_depth, int&nbsp;conversionflags )
</h3>
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="qt.html#ImageConversionFlags-enum">Qt::ImageConversionFlags</a>.

<h3 class=fn>bool <a name="packImage"></a>QPNGImagePacker::packImage ( const&nbsp;<a href="qimage.html">QImage</a>&nbsp;&amp;&nbsp;img )
</h3>
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>QPNGImagePacker::setPixelAlignment ( int&nbsp;x )
</h3>
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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