projects / wxWidgets.git / blame
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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>TIFFReadScanline</title> | |
| 8 | </head> | |
| 9 | <body> | |
| 10 | ||
| 11 | <h1 align=center>TIFFReadScanline</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="#BUGS">BUGS</a><br> | |
| 19 | <a href="#SEE ALSO">SEE ALSO</a><br> | |
| 20 | ||
| 21 | <hr> | |
| 22 | <a name="NAME"></a> | |
| 23 | <h2>NAME</h2> | |
| 24 | <!-- INDENTATION --> | |
| 25 | <table width="100%" border=0 rules="none" frame="void" | |
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| 27 | <tr valign="top" align="left"> | |
| 28 | <td width="8%"></td> | |
| 29 | <td width="91%"> | |
| 30 | <p>TIFFReadScanline − read and decode a scanline of | |
| 31 | data from an open <small>TIFF</small> file</p> | |
| 32 | </td> | |
| 33 | </table> | |
| 34 | <a name="SYNOPSIS"></a> | |
| 35 | <h2>SYNOPSIS</h2> | |
| 36 | <!-- INDENTATION --> | |
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| 41 | <td width="91%"> | |
| 42 | <p><b>#include <tiffio.h></b></p> | |
| 43 | <!-- INDENTATION --> | |
| 44 | <p><b>int TIFFReadScanline(TIFF *</b><i>tif</i><b>, | |
| 45 | tdata_t</b> <i>buf</i><b>, uint32</b> <i>row</i><b>, | |
| 46 | tsample_t</b> <i>sample</i><b>)</b></p> | |
| 47 | </td> | |
| 48 | </table> | |
| 49 | <a name="DESCRIPTION"></a> | |
| 50 | <h2>DESCRIPTION</h2> | |
| 51 | <!-- INDENTATION --> | |
| 52 | <table width="100%" border=0 rules="none" frame="void" | |
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| 55 | <td width="8%"></td> | |
| 56 | <td width="91%"> | |
| 57 | <p>Read the data for the specified row into the (user | |
| 58 | supplied) data buffer <i>buf</i>. The data are returned | |
| 59 | decompressed and, in the native byte- and bit-ordering, but | |
| 60 | are otherwise packed (see further below). The buffer must be | |
| 61 | large enough to hold an entire scanline of data. | |
| 62 | Applications should call the routine <i>TIFFScanlineSize</i> | |
| 63 | to find out the size (in bytes) of a scanline buffer. The | |
| 64 | <i>row</i> parameter is always used by | |
| 65 | <i>TIFFReadScanline</i>; the <i>sample</i> parameter is used | |
| 66 | only if data are organized in separate planes | |
| 67 | (<i>PlanarConfiguration</i>=2).</p> | |
| 68 | </td> | |
| 69 | </table> | |
| 70 | <a name="NOTES"></a> | |
| 71 | <h2>NOTES</h2> | |
| 72 | <!-- INDENTATION --> | |
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| 76 | <td width="8%"></td> | |
| 77 | <td width="91%"> | |
| 78 | <p>The library attempts to hide bit- and byte-ordering | |
| 79 | differences between the image and the native machine by | |
| 80 | converting data to the native machine order. Bit reversal is | |
| 81 | done if the <i>FillOrder</i> tag is opposite to the native | |
| 82 | machine bit order. 16- and 32-bit samples are automatically | |
| 83 | byte-swapped if the file was written with a byte order | |
| 84 | opposite to the native machine byte order,</p> | |
| 85 | <!-- INDENTATION --> | |
| 86 | <p>In C++ the <i>sample</i> parameter defaults to 0.</p> | |
| 87 | </td> | |
| 88 | </table> | |
| 89 | <a name="RETURN VALUES"></a> | |
| 90 | <h2>RETURN VALUES</h2> | |
| 91 | <!-- INDENTATION --> | |
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| 95 | <td width="8%"></td> | |
| 96 | <td width="91%"> | |
| 97 | <p><i>TIFFReadScanline</i> returns −1 if it detects an | |
| 98 | error; otherwise 1 is returned.</p> | |
| 99 | </td> | |
| 100 | </table> | |
| 101 | <a name="DIAGNOSTICS"></a> | |
| 102 | <h2>DIAGNOSTICS</h2> | |
| 103 | <!-- INDENTATION --> | |
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| 107 | <td width="8%"></td> | |
| 108 | <td width="91%"> | |
| 109 | <p>All error messages are directed to the | |
| 110 | <i>TIFFError</i>(3TIFF) routine.</p> | |
| 111 | <!-- INDENTATION --> | |
| 112 | <p><b>Compression algorithm does not support random | |
| 113 | access</b>. Data was requested in a non-sequential order | |
| 114 | from a file that uses a compression algorithm and that has | |
| 115 | <i>RowsPerStrip</i> greater than one. That is, data in the | |
| 116 | image is stored in a compressed form, and with multiple rows | |
| 117 | packed into a strip. In this case, the library does not | |
| 118 | support random access to the data. The data should either be | |
| 119 | accessed sequentially, or the file should be converted so | |
| 120 | that each strip is made up of one row of data.</p> | |
| 121 | </td> | |
| 122 | </table> | |
| 123 | <a name="BUGS"></a> | |
| 124 | <h2>BUGS</h2> | |
| 125 | <!-- INDENTATION --> | |
| 126 | <table width="100%" border=0 rules="none" frame="void" | |
| 127 | cols="2" cellspacing="0" cellpadding="0"> | |
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| 129 | <td width="8%"></td> | |
| 130 | <td width="91%"> | |
| 131 | <p>Reading subsampled YCbCR data does not work correctly | |
| 132 | because, for <i>PlanarConfiguration</i>=2 the size of a | |
| 133 | scanline is not calculated on a per-sample basis, and for | |
| 134 | <i>PlanarConfiguration</i>=1 the library does not unpack the | |
| 135 | block-interleaved samples; use the strip- and tile-based | |
| 136 | interfaces to read these formats.</p> | |
| 137 | </td> | |
| 138 | </table> | |
| 139 | <a name="SEE ALSO"></a> | |
| 140 | <h2>SEE ALSO</h2> | |
| 141 | <!-- INDENTATION --> | |
| 142 | <table width="100%" border=0 rules="none" frame="void" | |
| 143 | cols="2" cellspacing="0" cellpadding="0"> | |
| 144 | <tr valign="top" align="left"> | |
| 145 | <td width="8%"></td> | |
| 146 | <td width="91%"> | |
| 147 | <p><b>TIFFOpen</b>(3TIFF), | |
| 148 | <b>TIFFReadEncodedStrip</b>(3TIFF), | |
| 149 | <b>TIFFReadRawStrip</b>(3TIFF), <b>libtiff</b>(3TIFF)</p> | |
| 150 | <!-- INDENTATION --> | |
| 151 | <p>Libtiff library home page: | |
| 152 | <b>http://www.remotesensing.org/libtiff/</b></p> | |
| 153 | </td> | |
| 154 | </table> | |
| 155 | <hr> | |
| 156 | </body> | |
| 157 | </html> |