File: qimageformat.html

package info (click to toggle)
qt-embedded 2.3.2-3
  • links: PTS
  • area: main
  • in suites: woody
  • size: 68,608 kB
  • ctags: 45,998
  • sloc: cpp: 276,654; ansic: 71,987; makefile: 29,074; sh: 12,305; yacc: 2,465; python: 1,863; perl: 481; lex: 480; xml: 68; lisp: 15
file content (77 lines) | stat: -rw-r--r-- 4,224 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Qt Toolkit - QImageFormat 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: white; color: black; }
--></style>
</head><body bgcolor="#ffffff">

<table width="100%">
<tr><td><a href="index.html">
<img width="100" height="100" src="qtlogo.png"
alt="Home" border="0"><img width="100"
height="100" src="face.png" alt="Home" border="0">
</a><td valign=top><div align=right><img src="dochead.png" width="472" height="27"><br>
<a href="classes.html"><b>Classes</b></a>
-<a href="annotated.html">Annotated</a>
- <a href="hierarchy.html">Tree</a>
-<a href="functions.html">Functions</a>
-<a href="index.html">Home</a>
-<a href="topicals.html"><b>Structure</b></a>
</div>
</table>

<h1 align=center>QImageFormat Class Reference</h1><br clear="all">
<p>
Incremental image decoder for a specific image format.
<a href="#details">More...</a>
<p>
<code>#include &lt;<a href="qasyncimageio-h.html">qasyncimageio.h</a>&gt;</code>
<p><a href="qimageformat-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class="fn">virtual<a href="#8e18d3"><b>~QImageFormat</b></a>()</div>
<li><div class="fn">virtualint<a href="#3d77dc"><b>decode</b></a>(QImage&amp;img, QImageConsumer*consumer, constuchar*buffer, intlength)</div>
</ul>
<hr><h2><a name="details"></a>Detailed Description</h2>
Incremental image decoder for a specific image format.
<p>
By making a derived classes of <a href="qimageformattype.html">QImageFormatType</a> which in turn
creates objects that are a subclass of QImageFormat, you can add
support for more incremental image formats, allowing such formats to
be sources for a <a href="qmovie.html">QMovie</a>, or for the first frame of the image stream
to be loaded as a <a href="qimage.html">QImage</a> or <a href="qpixmap.html">QPixmap</a>.
<p>Your new subclass must reimplement the <a href="#3d77dc">decode</a>() function in order to
process your new format.
<p>New QImageFormat objects are generated by new QImageFormatType factories.

<hr><h2>Member Function Documentation</h2>
<h3 class="fn"><a name="8e18d3"></a>QImageFormat::~QImageFormat() <code>[virtual]</code></h3>
<p>Destructs the object.
<h3 class="fn">int<a name="3d77dc"></a>QImageFormat::decode(<a href="qimage.html">QImage</a>&amp;img, <a href="qimageconsumer.html">QImageConsumer</a>*consumer, constuchar*buffer, intlength) <code>[virtual]</code></h3>
<p>New subclasses must reimplement this method.
<p>It should decode some or all of the bytes from <em>buffer</em> into
<em>img,</em> calling the methods of <em>consumer</em> as the decoding proceeds to
inform that consumer of changes to the image.
The consumer may be 0, in which case the function should just process
the data into <em>img</em> without telling any consumer about the changes.
Note that the decoder must store enough state
to be able to continue in subsequent calls to this method - this is
the essence of the incremental image loading.
<p>The function should return without processing all the data if it
reaches the end of a frame in the input.
<p>The function must return the number of bytes it has processed.
<hr><p>
Search the documentation, FAQ, qt-interest archive and more (uses
<a href="http://www.trolltech.com">www.trolltech.com</a>):<br>
<form method=post action="http://www.trolltech.com/search.cgi">
<input type=hidden name="version" value="2.3.2"><nobr>
<input size="50" name="search"><input type=submit value="Search">
</nobr></form><hr><p>
This file is part of the <a href="index.html">Qt toolkit</a>,
copyright &copy; 1995-2001
<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  2001 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align="right"><div align="right">Qt version 2.3.2</div>
</table></div></address></body></html>