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89 lines
4.0 KiB
89 lines
4.0 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qpngio.cpp:653 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QPNGImagePacker Class</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Functions</font></a>
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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>
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<p>The QPNGImagePacker class creates well-compressed PNG animations.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qpngio-h.html">qpngio.h</a>></tt>
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<p><a href="qpngimagepacker-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#QPNGImagePacker"><b>QPNGImagePacker</b></a> ( QIODevice * iod, int storage_depth, int conversionflags )</li>
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<li class=fn>void <a href="#setPixelAlignment"><b>setPixelAlignment</b></a> ( int x )</li>
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<li class=fn>bool <a href="#packImage"><b>packImage</b></a> ( const QImage & img )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QPNGImagePacker class creates well-compressed PNG animations.
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<p>
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<p> By using transparency, QPNGImagePacker allows you to build a PNG
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image from a sequence of QImages.
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<p> Images are added using <a href="#packImage">packImage</a>().
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<p>See also <a href="graphics.html">Graphics Classes</a> and <a href="images.html">Image Processing Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QPNGImagePacker"></a>QPNGImagePacker::QPNGImagePacker ( <a href="qiodevice.html">QIODevice</a> * iod, int storage_depth, int conversionflags )
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</h3>
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Creates an image packer that writes PNG data to IO device <em>iod</em>
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using a <em>storage_depth</em> bit encoding (use 8 or 32, depending on
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the desired quality and compression requirements).
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<p> If the image needs to be modified to fit in a lower-resolution
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result (e.g. converting from 32-bit to 8-bit), use the <em>conversionflags</em> to specify how you'd prefer this to happen.
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<p> <p>See also <a href="qt.html#ImageConversionFlags-enum">Qt::ImageConversionFlags</a>.
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<h3 class=fn>bool <a name="packImage"></a>QPNGImagePacker::packImage ( const <a href="qimage.html">QImage</a> & img )
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</h3>
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Adds the image <em>img</em> to the PNG animation, analyzing the
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differences between this and the previous image to improve
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compression.
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<h3 class=fn>void <a name="setPixelAlignment"></a>QPNGImagePacker::setPixelAlignment ( int x )
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</h3>
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Aligns pixel differences to <em>x</em> pixels. For example, using 8 can
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improve playback on certain hardware. Normally the default of
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1-pixel alignment (i.e. no alignment) gives better compression and
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performance.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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