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
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
<!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 - qtimage/qtimage.cpp example file
</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>Display Images in Qt-supported Formats</h1>
<p>
This example displays images which are in any format
supported by Qt. Combining this with the Qt ImageIO
Extension adds PNG image support to your browser.
It demonstrates the use of the QNPInstance::streamAsFile()
function.
<p>
To build the example, you must first build the
<a href=nsplugin.html>Qt Netscape Plugin Extension</a> library.
Then type <tt>make</tt> in <tt>extensions/nsplugin/examples/qtimage/</tt>
and copy the resulting <tt>qtimage.so</tt> or <tt>npqtimage.dll</tt>
to the Plugins directory of your WWW browser.
<p>
<table>
<tr>
<td valign=top><EMBED src=pnglogo.png WIDTH=256 HEIGHT=192>
<td valign=top>
This plugin displays a <a href=http://www.cdrom.com/pub/png/>PNG format</a> image.
<p>
New image format can be supported by
adding new image I/O handlers to the Qt library
(see QImage::defineIOHandler), thus providing the functionality in both
applications and WWW plugins from the same code.
</table>
<p>
This plugin supports transparency and scaling of the image, just like
GIFs in most WWW browsers.
<br>
<EMBED align=middle src=test.png WIDTH=182 HEIGHT=138>
<EMBED align=middle src=test.png WIDTH=137 HEIGHT=104>
<EMBED align=middle src=test.png WIDTH=91 HEIGHT=69>
<EMBED align=middle src=test.png WIDTH=46 HEIGHT=35>
<pre>// Qt stuff
#include "<a name="qnp.h"></a><a href="qnp-h.html">qnp.h</a>"
#include <<a name="qpainter.h"></a><a href="qpainter-h.html">qpainter.h</a>>
#include <<a name="qimage.h"></a><a href="qimage-h.html">qimage.h</a>>
#include <<a name="qpixmap.h"></a><a href="qpixmap-h.html">qpixmap.h</a>>
#include <<a name="qmessagebox.h"></a><a href="qmessagebox-h.html">qmessagebox.h</a>>
#include <<a name="qpopupmenu.h"></a><a href="qpopupmenu-h.html">qpopupmenu.h</a>>
#include "<a name="qpngio.h"></a><a href="qpngio-h.html">qpngio.h</a>"
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
class ImageView : public QNPWidget {
public:
ImageView()
{
popup = new <a name="QPopupMenu"></a><a href="qpopupmenu.html">QPopupMenu</a>;
popup-><a name="insertItem"></a><a href="qmenudata.html#0076cb">insertItem</a>("Left as");
popup-><a href="qmenudata.html#0076cb">insertItem</a>("An exercise");
popup-><a href="qmenudata.html#0076cb">insertItem</a>("For the");
popup-><a href="qmenudata.html#0076cb">insertItem</a>("Reader!");
}
void paintEvent(<a name="QPaintEvent"></a><a href="qpaintevent.html">QPaintEvent</a>* event)
{
<a name="QPainter"></a><a href="qpainter.html">QPainter</a> p(this);
p.<a name="setClipRect"></a><a href="qpainter.html#898839">setClipRect</a>(event-><a name="rect"></a><a href="qpaintevent.html#2d6e18">rect</a>());
if ( pm.<a name="size"></a><a href="qpixmap.html#60b65f">size</a>() == size() ) {
p.<a name="drawPixmap"></a><a href="qpainter.html#c64b89">drawPixmap</a>(0,0,pm);
} else {
if ( pmScaled.<a href="qpixmap.html#60b65f">size</a>() != size() ) {
<a name="QWMatrix"></a><a href="qwmatrix.html">QWMatrix</a> m;
m.<a name="scale"></a><a href="qwmatrix.html#41a356">scale</a>((double)width()/pm.<a name="width"></a><a href="qpixmap.html#86dbc5">width</a>(),
(double)height()/pm.<a name="height"></a><a href="qpixmap.html#d5bb33">height</a>());
pmScaled = pm.<a name="xForm"></a><a href="qpixmap.html#ff5fcf">xForm</a>(m);
}
p.<a href="qpainter.html#c64b89">drawPixmap</a>(0,0,pmScaled);
}
}
void mousePressEvent(<a name="QMouseEvent"></a><a href="qmouseevent.html">QMouseEvent</a>* e)
{
popup-><a name="popup"></a><a href="qpopupmenu.html#0d7b5f">popup</a>(mapToGlobal(e-><a name="pos"></a><a href="qmouseevent.html#ac6f25">pos</a>()));
}
void showImage(const QImage& image)
{
pm.<a name="convertFromImage"></a><a href="qpixmap.html#00951a">convertFromImage</a>(image, QPixmap::Color);
repaint( FALSE );
}
private:
<a name="QPixmap"></a><a href="qpixmap.html">QPixmap</a> pm;
<a href="qpixmap.html">QPixmap</a> pmScaled;
<a href="qpopupmenu.html">QPopupMenu</a>* popup;
};
class ImageLoader : public QNPInstance {
ImageView* iv;
<a name="QImage"></a><a href="qimage.html">QImage</a> image;
public:
ImageLoader() : iv(0)
{
}
<a name="QNPWidget"></a><a href="qnpwidget.html">QNPWidget</a>* newWindow()
{
iv = new ImageView;
imageToIV();
return iv;
}
void imageToIV()
{
if (!iv || image.<a name="isNull"></a><a href="qimage.html#2f0bdd">isNull</a>()) return;
iv->showImage(image);
image.<a name="reset"></a><a href="qimage.html#4533e3">reset</a>();
}
bool newStreamCreated(<a name="QNPStream"></a><a href="qnpstream.html">QNPStream</a>*, StreamMode& smode)
{
smode = AsFileOnly;
return TRUE;
}
void streamAsFile(<a href="qnpstream.html">QNPStream</a>*, const char* fname)
{
qInitPngIO();
image = QImage(fname);
if ( image.<a href="qimage.html#2f0bdd">isNull</a>() )
fprintf(stderr, "Could not convert file: %s\n", fname);
imageToIV();
}
};
class ImagePlugin : public QNPlugin {
public:
ImagePlugin()
{
}
<a name="QNPInstance"></a><a href="qnpinstance.html">QNPInstance</a>* newInstance()
{
return new ImageLoader;
}
const char* getMIMEDescription() const
{
return "image/x-png:png:PNG Image;"
"image/png:png:PNG Image;"
"image/x-portable-bitmap:pbm:PBM Image;"
"image/x-portable-graymap:pgm:PGM Image;"
"image/x-portable-pixmap:ppm:PPM Image;"
"image/bmp:bmp:BMP Image;"
"image/x-ms-bmp:bmp:BMP Image;"
"image/x-xpixmap:xpm:XPM Image;"
"image/xpm:xpm:XPM Image";
}
const char * getPluginNameString() const
{
return "Qt-based Image Plugin";
}
const char * getPluginDescriptionString() const
{
return "Supports all image formats supported by Qt";
}
};
<a name="QNPlugin"></a><a href="qnplugin.html">QNPlugin</a>* QNPlugin::create()
{
return new ImagePlugin;
}
</pre>
<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>
|
