|
0
|
1 |
<!-- Creator : groff version 1.18.1 -->
|
|
|
2 |
<!-- CreationDate: Mon Mar 13 18:03:10 2006 -->
|
|
|
3 |
<html>
|
|
|
4 |
<head>
|
|
|
5 |
<meta name="generator" content="groff -Thtml, see www.gnu.org">
|
|
|
6 |
<meta name="Content-Style" content="text/css">
|
|
|
7 |
<title>TIFFReadRGBATile</title>
|
|
|
8 |
</head>
|
|
|
9 |
<body>
|
|
|
10 |
|
|
|
11 |
<h1 align=center>TIFFReadRGBATile</h1>
|
|
|
12 |
<a href="#NAME">NAME</a><br>
|
|
|
13 |
<a href="#SYNOPSIS">SYNOPSIS</a><br>
|
|
|
14 |
<a href="#DESCRIPTION">DESCRIPTION</a><br>
|
|
|
15 |
<a href="#NOTES">NOTES</a><br>
|
|
|
16 |
<a href="#RETURN VALUES">RETURN VALUES</a><br>
|
|
|
17 |
<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
|
|
|
18 |
<a href="#SEE ALSO">SEE ALSO</a><br>
|
|
|
19 |
|
|
|
20 |
<hr>
|
|
|
21 |
<a name="NAME"></a>
|
|
|
22 |
<h2>NAME</h2>
|
|
|
23 |
<!-- INDENTATION -->
|
|
|
24 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
25 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
26 |
<tr valign="top" align="left">
|
|
|
27 |
<td width="8%"></td>
|
|
|
28 |
<td width="91%">
|
|
|
29 |
<p>TIFFReadRGBATile − read and decode an image tile
|
|
|
30 |
into a fixed-format raster</p>
|
|
|
31 |
</td>
|
|
|
32 |
</table>
|
|
|
33 |
<a name="SYNOPSIS"></a>
|
|
|
34 |
<h2>SYNOPSIS</h2>
|
|
|
35 |
<!-- INDENTATION -->
|
|
|
36 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
37 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
38 |
<tr valign="top" align="left">
|
|
|
39 |
<td width="8%"></td>
|
|
|
40 |
<td width="91%">
|
|
|
41 |
<p><b>#include <tiffio.h></b></p>
|
|
|
42 |
</td>
|
|
|
43 |
</table>
|
|
|
44 |
<!-- TABS -->
|
|
|
45 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
46 |
cols="5" cellspacing="0" cellpadding="0">
|
|
|
47 |
<tr valign="top" align="left">
|
|
|
48 |
<td width="8%"></td>
|
|
|
49 |
<td width="-2%">
|
|
|
50 |
|
|
|
51 |
<p><b>#define TIFFGetR(abgr)</b></p>
|
|
|
52 |
</td>
|
|
|
53 |
<td width="25%"></td>
|
|
|
54 |
<td width="6%"></td>
|
|
|
55 |
<td width="61%">
|
|
|
56 |
|
|
|
57 |
<p><b>((abgr) & 0xff)</b></p>
|
|
|
58 |
</td>
|
|
|
59 |
<tr valign="top" align="left">
|
|
|
60 |
<td width="8%"></td>
|
|
|
61 |
<td width="-2%">
|
|
|
62 |
|
|
|
63 |
<p><b>#define TIFFGetG(abgr)</b></p>
|
|
|
64 |
</td>
|
|
|
65 |
<td width="25%"></td>
|
|
|
66 |
<td width="6%"></td>
|
|
|
67 |
<td width="61%">
|
|
|
68 |
|
|
|
69 |
<p><b>(((abgr) >> 8) & 0xff)</b></p>
|
|
|
70 |
</td>
|
|
|
71 |
<tr valign="top" align="left">
|
|
|
72 |
<td width="8%"></td>
|
|
|
73 |
<td width="-2%">
|
|
|
74 |
|
|
|
75 |
<p><b>#define TIFFGetB(abgr)</b></p>
|
|
|
76 |
</td>
|
|
|
77 |
<td width="25%"></td>
|
|
|
78 |
<td width="6%"></td>
|
|
|
79 |
<td width="61%">
|
|
|
80 |
|
|
|
81 |
<p><b>(((abgr) >> 16) & 0xff)</b></p>
|
|
|
82 |
</td>
|
|
|
83 |
<tr valign="top" align="left">
|
|
|
84 |
<td width="8%"></td>
|
|
|
85 |
<td width="-2%">
|
|
|
86 |
|
|
|
87 |
<p><b>#define TIFFGetA(abgr)</b></p>
|
|
|
88 |
</td>
|
|
|
89 |
<td width="25%"></td>
|
|
|
90 |
<td width="6%"></td>
|
|
|
91 |
<td width="61%">
|
|
|
92 |
|
|
|
93 |
<p><b>(((abgr) >> 24) & 0xff)</b></p>
|
|
|
94 |
</td>
|
|
|
95 |
</table>
|
|
|
96 |
<!-- INDENTATION -->
|
|
|
97 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
98 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
99 |
<tr valign="top" align="left">
|
|
|
100 |
<td width="8%"></td>
|
|
|
101 |
<td width="91%">
|
|
|
102 |
<p><b>int TIFFReadRGBATile(TIFF *</b><i>tif</i><b>,
|
|
|
103 |
uint32</b> <i>x</i><b>, uint32</b> <i>y</i><b>, uint32
|
|
|
104 |
*</b><i>raster</i><b>)</b></p>
|
|
|
105 |
</td>
|
|
|
106 |
</table>
|
|
|
107 |
<a name="DESCRIPTION"></a>
|
|
|
108 |
<h2>DESCRIPTION</h2>
|
|
|
109 |
<!-- INDENTATION -->
|
|
|
110 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
111 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
112 |
<tr valign="top" align="left">
|
|
|
113 |
<td width="8%"></td>
|
|
|
114 |
<td width="91%">
|
|
|
115 |
<p><i>TIFFReadRGBATile</i> reads a single tile of a
|
|
|
116 |
tile-based image into memory, storing the result in the user
|
|
|
117 |
supplied RGBA <i>raster</i>. The raster is assumed to be an
|
|
|
118 |
array of width times length 32-bit entries, where width is
|
|
|
119 |
the width of a tile (TIFFTAG_TILEWIDTH) and length is the
|
|
|
120 |
height of a tile (TIFFTAG_TILELENGTH).</p>
|
|
|
121 |
<!-- INDENTATION -->
|
|
|
122 |
<p>The <i>x</i> and <i>y</i> values are the offsets from the
|
|
|
123 |
top left corner to the top left corner of the tile to be
|
|
|
124 |
read. They must be an exact multiple of the tile width and
|
|
|
125 |
length.</p>
|
|
|
126 |
<!-- INDENTATION -->
|
|
|
127 |
<p>Note that the raster is assume to be organized such that
|
|
|
128 |
the pixel at location (<i>x</i>,<i>y</i>) is
|
|
|
129 |
<i>raster</i>[<i>y</i>*<i>width</i>+<i>x</i>]; with the
|
|
|
130 |
raster origin in the <i>lower-left hand corner</i> of the
|
|
|
131 |
tile. That is bottom to top organization. Edge tiles which
|
|
|
132 |
partly fall off the image will be filled out with
|
|
|
133 |
appropriate zeroed areas.</p>
|
|
|
134 |
<!-- INDENTATION -->
|
|
|
135 |
<p>Raster pixels are 8-bit packed red, green, blue, alpha
|
|
|
136 |
samples. The macros <i>TIFFGetR</i>, <i>TIFFGetG</i>,
|
|
|
137 |
<i>TIFFGetB</i>, and <i>TIFFGetA</i> should be used to
|
|
|
138 |
access individual samples. Images without Associated Alpha
|
|
|
139 |
matting information have a constant Alpha of 1.0 (255).</p>
|
|
|
140 |
<!-- INDENTATION -->
|
|
|
141 |
<p>See the <i>TIFFRGBAImage</i>(3TIFF) page for more details
|
|
|
142 |
on how various image types are converted to RGBA values.</p>
|
|
|
143 |
</td>
|
|
|
144 |
</table>
|
|
|
145 |
<a name="NOTES"></a>
|
|
|
146 |
<h2>NOTES</h2>
|
|
|
147 |
<!-- INDENTATION -->
|
|
|
148 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
149 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
150 |
<tr valign="top" align="left">
|
|
|
151 |
<td width="8%"></td>
|
|
|
152 |
<td width="91%">
|
|
|
153 |
<p>Samples must be either 1, 2, 4, 8, or 16 bits.
|
|
|
154 |
Colorimetric samples/pixel must be either 1, 3, or 4 (i.e.
|
|
|
155 |
<i>SamplesPerPixel</i> minus <i>ExtraSamples</i>).</p>
|
|
|
156 |
<!-- INDENTATION -->
|
|
|
157 |
<p>Palette image colormaps that appear to be incorrectly
|
|
|
158 |
written as 8-bit values are automatically scaled to
|
|
|
159 |
16-bits.</p>
|
|
|
160 |
<!-- INDENTATION -->
|
|
|
161 |
<p><i>TIFFReadRGBATile</i> is just a wrapper around the more
|
|
|
162 |
general <i>TIFFRGBAImage</i>(3TIFF) facilities. It’s
|
|
|
163 |
main advantage over the similar <i>TIFFReadRGBAImage()</i>
|
|
|
164 |
function is that for large images a single buffer capable of
|
|
|
165 |
holding the whole image doesn’t need to be allocated,
|
|
|
166 |
only enough for one tile. The <i>TIFFReadRGBAStrip()</i>
|
|
|
167 |
function does a similar operation for stripped images.</p>
|
|
|
168 |
</td>
|
|
|
169 |
</table>
|
|
|
170 |
<a name="RETURN VALUES"></a>
|
|
|
171 |
<h2>RETURN VALUES</h2>
|
|
|
172 |
<!-- INDENTATION -->
|
|
|
173 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
174 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
175 |
<tr valign="top" align="left">
|
|
|
176 |
<td width="8%"></td>
|
|
|
177 |
<td width="91%">
|
|
|
178 |
<p>1 is returned if the image was successfully read and
|
|
|
179 |
converted. Otherwise, 0 is returned if an error was
|
|
|
180 |
encountered.</p>
|
|
|
181 |
</td>
|
|
|
182 |
</table>
|
|
|
183 |
<a name="DIAGNOSTICS"></a>
|
|
|
184 |
<h2>DIAGNOSTICS</h2>
|
|
|
185 |
<!-- INDENTATION -->
|
|
|
186 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
187 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
188 |
<tr valign="top" align="left">
|
|
|
189 |
<td width="8%"></td>
|
|
|
190 |
<td width="91%">
|
|
|
191 |
<p>All error messages are directed to the
|
|
|
192 |
<i>TIFFError</i>(3TIFF) routine.</p>
|
|
|
193 |
<!-- INDENTATION -->
|
|
|
194 |
<p><b>Sorry, can not handle %d-bit pictures</b>. The image
|
|
|
195 |
had <i>BitsPerSample</i> other than 1, 2, 4, 8, or 16.</p>
|
|
|
196 |
<!-- INDENTATION -->
|
|
|
197 |
<p><b>Sorry, can not handle %d-channel images</b>. The image
|
|
|
198 |
had <i>SamplesPerPixel</i> other than 1, 3, or 4.</p>
|
|
|
199 |
<!-- INDENTATION -->
|
|
|
200 |
<p><b>Missing needed "PhotometricInterpretation"
|
|
|
201 |
tag</b>. The image did not have a tag that describes how to
|
|
|
202 |
display the data.</p>
|
|
|
203 |
<!-- INDENTATION -->
|
|
|
204 |
<p><b>No "PhotometricInterpretation" tag, assuming
|
|
|
205 |
RGB</b>. The image was missing a tag that describes how to
|
|
|
206 |
display it, but because it has 3 or 4 samples/pixel, it is
|
|
|
207 |
assumed to be <small>RGB.</small></p>
|
|
|
208 |
<!-- INDENTATION -->
|
|
|
209 |
<p><b>No "PhotometricInterpretation" tag, assuming
|
|
|
210 |
min-is-black</b>. The image was missing a tag that describes
|
|
|
211 |
how to display it, but because it has 1 sample/pixel, it is
|
|
|
212 |
assumed to be a grayscale or bilevel image.</p>
|
|
|
213 |
<!-- INDENTATION -->
|
|
|
214 |
<p><b>No space for photometric conversion table</b>. There
|
|
|
215 |
was insufficient memory for a table used to convert image
|
|
|
216 |
samples to 8-bit <small>RGB.</small></p>
|
|
|
217 |
<!-- INDENTATION -->
|
|
|
218 |
<p><b>Missing required "Colormap" tag</b>. A
|
|
|
219 |
Palette image did not have a required <i>Colormap</i>
|
|
|
220 |
tag.</p>
|
|
|
221 |
<!-- INDENTATION -->
|
|
|
222 |
<p><b>No space for tile buffer</b>. There was insufficient
|
|
|
223 |
memory to allocate an i/o buffer.</p>
|
|
|
224 |
<!-- INDENTATION -->
|
|
|
225 |
<p><b>No space for strip buffer</b>. There was insufficient
|
|
|
226 |
memory to allocate an i/o buffer.</p>
|
|
|
227 |
<!-- INDENTATION -->
|
|
|
228 |
<p><b>Can not handle format</b>. The image has a format
|
|
|
229 |
(combination of <i>BitsPerSample</i>,
|
|
|
230 |
<i>SamplesPerPixel</i>, and
|
|
|
231 |
<i>PhotometricInterpretation</i>) that
|
|
|
232 |
<i>TIFFReadRGBAImage</i> can not handle.</p>
|
|
|
233 |
<!-- INDENTATION -->
|
|
|
234 |
<p><b>No space for B&W mapping table</b>. There was
|
|
|
235 |
insufficient memory to allocate a table used to map
|
|
|
236 |
grayscale data to <small>RGB.</small></p>
|
|
|
237 |
<!-- INDENTATION -->
|
|
|
238 |
<p><b>No space for Palette mapping table</b>. There was
|
|
|
239 |
insufficient memory to allocate a table used to map data to
|
|
|
240 |
8-bit <small>RGB.</small></p>
|
|
|
241 |
</td>
|
|
|
242 |
</table>
|
|
|
243 |
<a name="SEE ALSO"></a>
|
|
|
244 |
<h2>SEE ALSO</h2>
|
|
|
245 |
<!-- INDENTATION -->
|
|
|
246 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
247 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
248 |
<tr valign="top" align="left">
|
|
|
249 |
<td width="8%"></td>
|
|
|
250 |
<td width="91%">
|
|
|
251 |
<p><b>TIFFOpen</b>(3TIFF), <b>TIFFRGBAImage</b>(3TIFF),
|
|
|
252 |
<b>TIFFReadRGBAImage</b>(3TIFF),
|
|
|
253 |
<b>TIFFReadRGBAStrip</b>(3TIFF), <b>libtiff</b>(3TIFF)</p>
|
|
|
254 |
<!-- INDENTATION -->
|
|
|
255 |
<p>Libtiff library home page:
|
|
|
256 |
<b>http://www.remotesensing.org/libtiff/</b></p>
|
|
|
257 |
</td>
|
|
|
258 |
</table>
|
|
|
259 |
<hr>
|
|
|
260 |
</body>
|
|
|
261 |
</html>
|