qpngimagepacker.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/src/kernel/qpngio.cpp:598 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>QPNGImagePacker Class</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td valign=center> <a href="index.html"><font color="#004faf">Home</font></a> | <a href="classes.html"><font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> | <a href="annotated.html"><font color="#004faf">Annotated</font></a> | <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"><font color="#004faf">Functions</font></a></td><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 <<a href="qpngio-h.html">qpngio.h</a>></tt><p><a href="qpngimagepacker-members.html">List of all member functions.</a><h2>Public Members</h2><ul><li><div class=fn><a href="#QPNGImagePacker"><b>QPNGImagePacker</b></a> ( QIODevice * iod, int storage_depth, int conversionflags )</div></li><li><div class=fn>void <a href="#setPixelAlignment"><b>setPixelAlignment</b></a> ( int x )</div></li><li><div class=fn>bool <a href="#packImage"><b>packImage</b></a> ( const QImage & img )</div></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 PNGimage 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> * iod, int storage_depth, int 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 onthe desired quality and compression requirements).<p> If the image needs to be modified to fit in a lower-resolutionresult (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 <a href="qimage.html">QImage</a> & img )</h3>Adds the image <em>img</em> to the PNG animation, analyzing thedifferences between this and the previous image to improvecompression.<h3 class=fn>void <a name="setPixelAlignment"></a>QPNGImagePacker::setPixelAlignment ( int x )</h3>Aligns pixel differences to <em>x</em> pixels. For example, using 8 canimprove playback on certain hardware. Normally the default of1-pixel alignment (i.e. no alignment) gives better compression andperformance.<!-- eof --><hr><p>This file is part of the <a href="index.html">Qt toolkit</a>.Copyright © 1995-2002<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center><table width=100% cellspacing=0 border=0><tr><td>Copyright © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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