2002-10-07 09:47:36 -04:00
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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<meta name="Content-Style" content="text/css">
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<title>TIFFReadRGBAStrip</title>
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<h1 align=center>TIFFReadRGBAStrip</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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<!-- Creator : groff version 1.18 -->
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<!-- CreationDate: Mon Oct 7 17:36:19 2002 -->
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<a name="NAME"></a>
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<h2>NAME</h2>
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<p><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>TIFFReadRGBAStrip − read and decode an image strip
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into a fixed-format raster</p>
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</td>
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</table></p>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<p><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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<pre><b>#include <tiffio.h></b></pre>
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</td>
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</table></p>
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<!-- TABS -->
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<p><b>#define TIFFGetR(abgr) ((abgr) & 0xff)</b></p>
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<!-- TABS -->
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<table width="100%" border=0 rules="none" frame="void"
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cols="4" 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="1%">
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<p><b>#define TIFFGetG(abgr)</b></p>
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</td>
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<td width="21%"></td>
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<td width="67%">
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<p><b>(((abgr) >> 8) & 0xff)</b></p>
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</td>
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<tr valign="top" align="left">
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<td width="8%"></td>
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<td width="1%">
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<p><b>#define TIFFGetB(abgr)</b></p>
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</td>
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<td width="21%"></td>
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<td width="67%">
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<p><b>(((abgr) >> 16) & 0xff)</b></p>
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</td>
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<tr valign="top" align="left">
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<td width="8%"></td>
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<td width="1%">
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<p><b>#define TIFFGetA(abgr)</b></p>
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</td>
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<td width="21%"></td>
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<td width="67%">
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<p><b>(((abgr) >> 24) & 0xff)</b></p>
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</td>
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</table>
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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>int TIFFReadRGBAStrip(TIFF* tif, uint32 row, uint32 *
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raster )</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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<p><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><i>TIFFReadRGBAStrip</i> reads a single strip of a
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strip-based image into memory, storing the result in the
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user supplied RGBA <i>raster</i>. The raster is assumed to
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be an array of width times rowsperstrip 32-bit entries,
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where width is the width of the image (TIFFTAG_IMAGEWIDTH)
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and rowsperstrip is the maximum lines in a strip
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(TIFFTAG_ROWSPERSTRIP).</p>
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<p>The <i>row</i> value should be the row of the first row
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in the strip (strip * rowsperstrip, zero based).</p>
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<!-- INDENTATION -->
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<p>Note that the raster is assume to be organized such that
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the pixel at location (<i>x</i>,<i>y</i>) is
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<i>raster</i>[<i>y</i>*<i>width</i>+<i>x</i>]; with the
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raster origin in the <i>lower-left hand corner</i> of the
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strip. That is bottom to top organization. When reading a
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partial last strip in the file the last line of the image
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will begin at the beginning of the buffer.</p>
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<!-- INDENTATION -->
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<p>Raster pixels are 8-bit packed red, green, blue, alpha
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samples. The macros <i>TIFFGetR</i>, <i>TIFFGetG</i>,
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<i>TIFFGetB</i>, and <i>TIFFGetA</i> should be used to
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access individual samples. Images without Associated Alpha
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matting information have a constant Alpha of 1.0 (255).</p>
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<!-- INDENTATION -->
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<p>See the <i>TIFFRGBAImage</i>(3T) page for more details on
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how various image types are converted to RGBA values.</p>
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</td>
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</table></p>
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<a name="NOTES"></a>
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<h2>NOTES</h2>
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<!-- INDENTATION -->
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<p><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>Samples must be either 1, 2, 4, 8, or 16 bits.
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1999-11-22 23:29:23 -05:00
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Colorimetric samples/pixel must be either 1, 3, or 4 (i.e.
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2002-10-07 09:47:36 -04:00
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<i>SamplesPerPixel</i> minus <i>ExtraSamples</i>).</p>
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<!-- INDENTATION -->
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<p>Palette image colormaps that appear to be incorrectly
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written as 8-bit values are automatically scaled to
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16-bits.</p>
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<!-- INDENTATION -->
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<p><i>TIFFReadRGBAStrip</i> is just a wrapper around the
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more general <i>TIFFRGBAImage</i>(3T) facilities. It’s
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main advantage over the similar <i>TIFFReadRGBAImage()</i>
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function is that for large images a single buffer capable of
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holding the whole image doesn’t need to be allocated,
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only enough for one strip. The <i>TIFFReadRGBATile()</i>
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function does a similar operation for tiled images.</p>
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</td>
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</table></p>
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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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<p><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>1 is returned if the image was successfully read and
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converted. Otherwise, 0 is returned if an error was
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encountered.</p>
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</td>
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</table></p>
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<a name="DIAGNOSTICS"></a>
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<h2>DIAGNOSTICS</h2>
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<p><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>All error messages are directed to the
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<i>TIFFError</i>(3T) routine.</p>
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<p><b>Sorry, can not handle %d-bit pictures</b>. The image
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had <i>BitsPerSample</i> other than 1, 2, 4, 8, or 16.</p>
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<p><b>Sorry, can not handle %d-channel images</b>. The image
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had <i>SamplesPerPixel</i> other than 1, 3, or 4.</p>
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<p><b>Missing needed "PhotometricInterpretation"
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tag</b>. The image did not have a tag that describes how to
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display the data.</p>
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<p><b>No "PhotometricInterpretation" tag, assuming
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RGB</b>. The image was missing a tag that describes how to
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display it, but because it has 3 or 4 samples/pixel, it is
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assumed to be <small>RGB.</small></p>
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<!-- INDENTATION -->
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<p><b>No "PhotometricInterpretation" tag, assuming
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min-is-black</b>. The image was missing a tag that describes
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how to display it, but because it has 1 sample/pixel, it is
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assumed to be a grayscale or bilevel image.</p>
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<!-- INDENTATION -->
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<p><b>No space for photometric conversion table</b>. There
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was insufficient memory for a table used to convert image
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samples to 8-bit <small>RGB.</small></p>
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<!-- INDENTATION -->
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<p><b>Missing required "Colormap" tag</b>. A
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Palette image did not have a required <i>Colormap</i>
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tag.</p>
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<!-- INDENTATION -->
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<p><b>No space for tile buffer</b>. There was insufficient
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memory to allocate an i/o buffer.</p>
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<!-- INDENTATION -->
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<p><b>No space for strip buffer</b>. There was insufficient
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memory to allocate an i/o buffer.</p>
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<!-- INDENTATION -->
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<p><b>Can not handle format</b>. The image has a format
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(combination of <i>BitsPerSample</i>,
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<i>SamplesPerPixel</i>, and
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<i>PhotometricInterpretation</i>) that
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<i>TIFFReadRGBAImage</i> can not handle.</p>
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<!-- INDENTATION -->
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<p><b>No space for B&W mapping table</b>. There was
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insufficient memory to allocate a table used to map
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grayscale data to <small>RGB.</small></p>
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<!-- INDENTATION -->
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<p><b>No space for Palette mapping table</b>. There was
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insufficient memory to allocate a table used to map data to
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8-bit <small>RGB.</small></p>
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</td>
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</table></p>
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<a name="BUGS"></a>
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<h2>BUGS</h2>
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<!-- INDENTATION -->
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<p><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>Orientations other than bottom-left, or top-left are not
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handled correctly.</p>
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</td>
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</table></p>
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<a name="SEE ALSO"></a>
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<h2>SEE ALSO</h2>
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<!-- INDENTATION -->
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<p><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><i>libtiff</i>(3T), <i>TIFFOpen</i>(3T),
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<i>TIFFRGBAImage</i>(3T), <i>TIFFReadRGBAImage</i>(3T),
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<i>TIFFReadRGBATile</i>(3T)</p>
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</td>
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</table></p>
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<hr>
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</body>
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</html>
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