| author | eckhart.koppen@nokia.com |
| Wed, 31 Mar 2010 11:06:36 +0300 | |
| changeset 7 | f7bc934e204c |
| permissions | -rw-r--r-- |
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<title>TIFFReadScanline</title> |
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</head> |
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<body> |
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<h1 align=center>TIFFReadScanline</h1> |
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<a href="#NAME">NAME</a><br> |
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<a href="#SYNOPSIS">SYNOPSIS</a><br> |
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<a href="#DESCRIPTION">DESCRIPTION</a><br> |
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<a href="#NOTES">NOTES</a><br> |
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<a href="#RETURN VALUES">RETURN VALUES</a><br> |
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<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br> |
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<a href="#BUGS">BUGS</a><br> |
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<a href="#SEE ALSO">SEE ALSO</a><br> |
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<hr> |
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<a name="NAME"></a> |
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<h2>NAME</h2> |
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<!-- INDENTATION --> |
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<table width="100%" border=0 rules="none" frame="void" |
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cols="2" cellspacing="0" cellpadding="0"> |
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<tr valign="top" align="left"> |
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<td width="8%"></td> |
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<td width="91%"> |
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<p>TIFFReadScanline − read and decode a scanline of |
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data from an open <small>TIFF</small> file</p> |
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</td> |
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</table> |
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<a name="SYNOPSIS"></a> |
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<h2>SYNOPSIS</h2> |
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<!-- INDENTATION --> |
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<table width="100%" border=0 rules="none" frame="void" |
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cols="2" cellspacing="0" cellpadding="0"> |
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<tr valign="top" align="left"> |
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<td width="8%"></td> |
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<td width="91%"> |
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<p><b>#include <tiffio.h></b></p> |
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<p><b>int TIFFReadScanline(TIFF *</b><i>tif</i><b>, |
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tdata_t</b> <i>buf</i><b>, uint32</b> <i>row</i><b>, |
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tsample_t</b> <i>sample</i><b>)</b></p> |
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</td> |
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</table> |
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<a name="DESCRIPTION"></a> |
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<h2>DESCRIPTION</h2> |
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<!-- INDENTATION --> |
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<table width="100%" border=0 rules="none" frame="void" |
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cols="2" cellspacing="0" cellpadding="0"> |
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<tr valign="top" align="left"> |
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<td width="8%"></td> |
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<td width="91%"> |
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<p>Read the data for the specified row into the (user |
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supplied) data buffer <i>buf</i>. The data are returned |
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decompressed and, in the native byte- and bit-ordering, but |
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are otherwise packed (see further below). The buffer must be |
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large enough to hold an entire scanline of data. |
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Applications should call the routine <i>TIFFScanlineSize</i> |
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to find out the size (in bytes) of a scanline buffer. The |
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<i>row</i> parameter is always used by |
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<i>TIFFReadScanline</i>; the <i>sample</i> parameter is used |
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only if data are organized in separate planes |
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(<i>PlanarConfiguration</i>=2).</p> |
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</td> |
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</table> |
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<a name="NOTES"></a> |
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<h2>NOTES</h2> |
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<!-- INDENTATION --> |
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<table width="100%" border=0 rules="none" frame="void" |
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cols="2" cellspacing="0" cellpadding="0"> |
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<tr valign="top" align="left"> |
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<td width="8%"></td> |
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<td width="91%"> |
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<p>The library attempts to hide bit- and byte-ordering |
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differences between the image and the native machine by |
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converting data to the native machine order. Bit reversal is |
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done if the <i>FillOrder</i> tag is opposite to the native |
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machine bit order. 16- and 32-bit samples are automatically |
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byte-swapped if the file was written with a byte order |
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opposite to the native machine byte order,</p> |
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<!-- INDENTATION --> |
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<p>In C++ the <i>sample</i> parameter defaults to 0.</p> |
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</td> |
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</table> |
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<a name="RETURN VALUES"></a> |
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<h2>RETURN VALUES</h2> |
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<!-- INDENTATION --> |
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<table width="100%" border=0 rules="none" frame="void" |
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cols="2" cellspacing="0" cellpadding="0"> |
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<tr valign="top" align="left"> |
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<td width="8%"></td> |
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96 |
<td width="91%"> |
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97 |
<p><i>TIFFReadScanline</i> returns −1 if it detects an |
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98 |
error; otherwise 1 is returned.</p> |
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99 |
</td> |
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100 |
</table> |
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101 |
<a name="DIAGNOSTICS"></a> |
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102 |
<h2>DIAGNOSTICS</h2> |
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103 |
<!-- INDENTATION --> |
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104 |
<table width="100%" border=0 rules="none" frame="void" |
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105 |
cols="2" cellspacing="0" cellpadding="0"> |
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106 |
<tr valign="top" align="left"> |
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107 |
<td width="8%"></td> |
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108 |
<td width="91%"> |
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109 |
<p>All error messages are directed to the |
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110 |
<i>TIFFError</i>(3TIFF) routine.</p> |
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111 |
<!-- INDENTATION --> |
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112 |
<p><b>Compression algorithm does not support random |
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113 |
access</b>. Data was requested in a non-sequential order |
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114 |
from a file that uses a compression algorithm and that has |
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115 |
<i>RowsPerStrip</i> greater than one. That is, data in the |
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116 |
image is stored in a compressed form, and with multiple rows |
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117 |
packed into a strip. In this case, the library does not |
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118 |
support random access to the data. The data should either be |
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119 |
accessed sequentially, or the file should be converted so |
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120 |
that each strip is made up of one row of data.</p> |
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121 |
</td> |
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122 |
</table> |
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123 |
<a name="BUGS"></a> |
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124 |
<h2>BUGS</h2> |
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125 |
<!-- INDENTATION --> |
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126 |
<table width="100%" border=0 rules="none" frame="void" |
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127 |
cols="2" cellspacing="0" cellpadding="0"> |
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128 |
<tr valign="top" align="left"> |
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129 |
<td width="8%"></td> |
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130 |
<td width="91%"> |
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131 |
<p>Reading subsampled YCbCR data does not work correctly |
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132 |
because, for <i>PlanarConfiguration</i>=2 the size of a |
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133 |
scanline is not calculated on a per-sample basis, and for |
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134 |
<i>PlanarConfiguration</i>=1 the library does not unpack the |
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135 |
block-interleaved samples; use the strip- and tile-based |
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136 |
interfaces to read these formats.</p> |
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137 |
</td> |
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138 |
</table> |
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139 |
<a name="SEE ALSO"></a> |
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140 |
<h2>SEE ALSO</h2> |
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141 |
<!-- INDENTATION --> |
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142 |
<table width="100%" border=0 rules="none" frame="void" |
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143 |
cols="2" cellspacing="0" cellpadding="0"> |
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144 |
<tr valign="top" align="left"> |
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145 |
<td width="8%"></td> |
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146 |
<td width="91%"> |
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147 |
<p><b>TIFFOpen</b>(3TIFF), |
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148 |
<b>TIFFReadEncodedStrip</b>(3TIFF), |
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149 |
<b>TIFFReadRawStrip</b>(3TIFF), <b>libtiff</b>(3TIFF)</p> |
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150 |
<!-- INDENTATION --> |
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151 |
<p>Libtiff library home page: |
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152 |
<b>http://www.remotesensing.org/libtiff/</b></p> |
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153 |
</td> |
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154 |
</table> |
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155 |
<hr> |
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156 |
</body> |
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157 |
</html> |