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| author | Timothy Pearson <[email protected]> | 2011-07-10 15:24:15 -0500 |
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| committer | Timothy Pearson <[email protected]> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/qimagedecoder.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
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| -rw-r--r-- | doc/html/qimagedecoder.html | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/doc/html/qimagedecoder.html b/doc/html/qimagedecoder.html new file mode 100644 index 0000000..a0a1368 --- /dev/null +++ b/doc/html/qimagedecoder.html @@ -0,0 +1,154 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qasyncimageio.cpp:153 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>QImageDecoder Class</title> +<style type="text/css"><!-- +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>QImageDecoder Class Reference</h1> + +<p>The QImageDecoder class is an incremental image decoder for all supported image formats. +<a href="#details">More...</a> +<p><tt>#include <<a href="qasyncimageio-h.html">qasyncimageio.h</a>></tt> +<p><a href="qimagedecoder-members.html">List of all member functions.</a> +<h2>Public Members</h2> +<ul> +<li class=fn><a href="#QImageDecoder"><b>QImageDecoder</b></a> ( QImageConsumer * c )</li> +<li class=fn><a href="#~QImageDecoder"><b>~QImageDecoder</b></a> ()</li> +<li class=fn>const QImage & <a href="#image"><b>image</b></a> ()</li> +<li class=fn>int <a href="#decode"><b>decode</b></a> ( const uchar * buffer, int length )</li> +</ul> +<h2>Static Public Members</h2> +<ul> +<li class=fn>const char * <a href="#formatName"><b>formatName</b></a> ( const uchar * buffer, int length )</li> +<li class=fn>QImageFormatType * <a href="#format"><b>format</b></a> ( const char * name )</li> +<li class=fn>QStrList <a href="#inputFormats"><b>inputFormats</b></a> ()</li> +<li class=fn>void <a href="#registerDecoderFactory"><b>registerDecoderFactory</b></a> ( QImageFormatType * f )</li> +<li class=fn>void <a href="#unregisterDecoderFactory"><b>unregisterDecoderFactory</b></a> ( QImageFormatType * f )</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + +The QImageDecoder class is an incremental image decoder for all supported image formats. +<p> + + +<p> New formats are installed by creating objects of class +<a href="qimageformattype.html">QImageFormatType</a>; the <a href="qmovie.html">QMovie</a> class can be used for all installed +incremental image formats. QImageDecoder is only useful for +creating new ways of feeding data to an <a href="qimageconsumer.html">QImageConsumer</a>. +<p> A QImageDecoder is a machine that decodes images. It takes encoded +image data via its <a href="#decode">decode</a>() method and expresses its decoding by +supplying information to a QImageConsumer. It implements its +decoding by using a <a href="qimageformat.html">QImageFormat</a> created by one of the +currently-existing QImageFormatType factory objects. +<p> QImageFormatType and QImageFormat are the classes that you might +need to implement support for additional image formats. +<p> +<p> Qt supports GIF reading if it is configured that way during +installation (see qgif.h). If it is, we are required to state that +"The Graphics Interchange Format(c) is the Copyright property of +CompuServe Incorporated. GIF(sm) is a Service Mark property of +CompuServe Incorporated." +<p> <b>Warning:</b> If you are in a country that recognizes software patents +and in which Unisys holds a patent on LZW compression and/or +decompression and you want to use GIF, Unisys may require you to +license that technology. Such countries include Canada, Japan, +the USA, France, Germany, Italy and the UK. +<p> GIF support may be removed completely in a future version of Qt. +We recommend using the MNG or PNG format. +<p>See also <a href="graphics.html">Graphics Classes</a>, <a href="images.html">Image Processing Classes</a>, and <a href="multimedia.html">Multimedia Classes</a>. + +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="QImageDecoder"></a>QImageDecoder::QImageDecoder ( <a href="qimageconsumer.html">QImageConsumer</a> * c ) +</h3> +Constructs a QImageDecoder that will send change information to +the <a href="qimageconsumer.html">QImageConsumer</a> <em>c</em>. + +<h3 class=fn><a name="~QImageDecoder"></a>QImageDecoder::~QImageDecoder () +</h3> +Destroys a QImageDecoder. The image it built is destroyed. The +decoder built by the factory for the file format is destroyed. The +consumer for which it decoded the image is <em>not</em> destroyed. + +<h3 class=fn>int <a name="decode"></a>QImageDecoder::decode ( const uchar * buffer, int length ) +</h3> +Call this function to decode some data into image changes. The +data in <em>buffer</em> will be decoded, sending change information to +the <a href="qimageconsumer.html">QImageConsumer</a> of this QImageDecoder until one of the change +functions of the consumer returns FALSE. The length of the data is +given in <em>length</em>. +<p> Returns the number of bytes consumed: 0 if consumption is +complete, and -1 if decoding fails due to invalid data. + +<h3 class=fn><a href="qimageformattype.html">QImageFormatType</a> * <a name="format"></a>QImageDecoder::format ( const char * name )<tt> [static]</tt> +</h3> +Returns a <a href="qimageformattype.html">QImageFormatType</a> by name. This might be used when the +user needs to force data to be interpreted as being in a certain +format. <em>name</em> is one of the formats listed by +<a href="#inputFormats">QImageDecoder::inputFormats</a>(). Note that you will still need to +supply decodable data to result->decoderFor() before you can begin +decoding the data. + +<h3 class=fn>const char * <a name="formatName"></a>QImageDecoder::formatName ( const uchar * buffer, int length )<tt> [static]</tt> +</h3> +Call this function to find the name of the format of the given +header. The returned string is statically allocated. The function +will look at the first <em>length</em> characters in the <em>buffer</em>. +<p> Returns 0 if the format is not recognized. + +<h3 class=fn>const <a href="qimage.html">QImage</a> & <a name="image"></a>QImageDecoder::image () +</h3> + +<p> Returns the image currently being decoded. + +<h3 class=fn><a href="qstrlist.html">QStrList</a> <a name="inputFormats"></a>QImageDecoder::inputFormats ()<tt> [static]</tt> +</h3> +Returns a sorted list of formats for which asynchronous loading is +supported. + +<h3 class=fn>void <a name="registerDecoderFactory"></a>QImageDecoder::registerDecoderFactory ( <a href="qimageformattype.html">QImageFormatType</a> * f )<tt> [static]</tt> +</h3> +Registers the new <a href="qimageformattype.html">QImageFormatType</a> <em>f</em>. This is not needed in +application code because factories call this themselves. + +<h3 class=fn>void <a name="unregisterDecoderFactory"></a>QImageDecoder::unregisterDecoderFactory ( <a href="qimageformattype.html">QImageFormatType</a> * f )<tt> [static]</tt> +</h3> +Unregisters the <a href="qimageformattype.html">QImageFormatType</a> <em>f</em>. This is not needed in +application code because factories call this themselves. + +<!-- eof --> +<hr><p> +This file is part of the <a href="index.html">Qt toolkit</a>. +Copyright © 1995-2007 +<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 © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>Qt 3.3.8</div> +</table></div></address></body> +</html> |