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<div class='body'>
<!--
  "$Id: api-driver.html 8653 2009-05-16 23:53:28Z mike $"

Driver API header for CUPS.

These coded instructions, statements, and computer programs are the
  property of Apple Inc. and are protected by Federal copyright
  law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  which should have been included with this file.  If this file is
  file is missing or damaged, see the license at "http://www.cups.org/".
-->

<h1 class='title'>Driver API</h1>

<div class='summary'><table summary='General Information'>
<thead>
<tr>
	<th>Header</th>
	<th>cups/driver.h</th>
</tr>
</thead>
<tbody>
<tr>
	<th>Library</th>
	<td>-lcupsdriver</td>
</tr>
<tr>
	<th>See Also</th>
	<td>Programming: <a href='api-overview.html' target='_top'>Introduction to CUPS Programming</a></td>
</tr>
</tbody>
</table></div>
<h2 class="title">Contents</h2>
<ul class="contents">
<ul class="subcontents">
<li><a href="#OVERVIEW">Overview</a></li>
<li><a href="#FUNCTIONS">Functions</a><ul class="code">
<li><a href="#cupsCMYKDelete" title="Delete a color separation.">cupsCMYKDelete</a></li>
<li><a href="#cupsCMYKDoBlack" title="Do a black separation...">cupsCMYKDoBlack</a></li>
<li><a href="#cupsCMYKDoCMYK" title="Do a CMYK separation...">cupsCMYKDoCMYK</a></li>
<li><a href="#cupsCMYKDoGray" title="Do a grayscale separation...">cupsCMYKDoGray</a></li>
<li><a href="#cupsCMYKDoRGB" title="Do an sRGB separation...">cupsCMYKDoRGB</a></li>
<li><a href="#cupsCMYKLoad" title="Load a CMYK color profile from PPD attributes.">cupsCMYKLoad</a></li>
<li><a href="#cupsCMYKNew" title="Create a new CMYK color separation.">cupsCMYKNew</a></li>
<li><a href="#cupsCMYKSetBlack" title="Set the transition range for CMY to black.">cupsCMYKSetBlack</a></li>
<li><a href="#cupsCMYKSetCurve" title="Set a color transform curve using points.">cupsCMYKSetCurve</a></li>
<li><a href="#cupsCMYKSetGamma" title="Set a color transform curve using gamma and density.">cupsCMYKSetGamma</a></li>
<li><a href="#cupsCMYKSetInkLimit" title="Set the limit on the amount of ink.">cupsCMYKSetInkLimit</a></li>
<li><a href="#cupsCMYKSetLtDk" title="Set light/dark ink transforms.">cupsCMYKSetLtDk</a></li>
<li><a href="#cupsCheckBytes" title="Check to see if all bytes are zero.">cupsCheckBytes</a></li>
<li><a href="#cupsCheckValue" title="Check to see if all bytes match the given value.">cupsCheckValue</a></li>
<li><a href="#cupsDitherDelete" title="Free a dithering buffer.">cupsDitherDelete</a></li>
<li><a href="#cupsDitherLine" title="Dither a line of pixels...">cupsDitherLine</a></li>
<li><a href="#cupsDitherNew" title="Create an error-diffusion dithering buffer.">cupsDitherNew</a></li>
<li><a href="#cupsFindAttr" title="Find a PPD attribute based on the colormodel,
media, and resolution.">cupsFindAttr</a></li>
<li><a href="#cupsLutDelete" title="Free the memory used by a lookup table.">cupsLutDelete</a></li>
<li><a href="#cupsLutLoad" title="Load a LUT from a PPD file.">cupsLutLoad</a></li>
<li><a href="#cupsLutNew" title="Make a lookup table from a list of pixel values.">cupsLutNew</a></li>
<li><a href="#cupsPackHorizontal" title="Pack pixels horizontally...">cupsPackHorizontal</a></li>
<li><a href="#cupsPackHorizontal2" title="Pack 2-bit pixels horizontally...">cupsPackHorizontal2</a></li>
<li><a href="#cupsPackHorizontalBit" title="Pack pixels horizontally by bit...">cupsPackHorizontalBit</a></li>
<li><a href="#cupsPackVertical" title="Pack pixels vertically...">cupsPackVertical</a></li>
<li><a href="#cupsRGBDelete" title="Delete a color separation.">cupsRGBDelete</a></li>
<li><a href="#cupsRGBDoGray" title="Do a grayscale separation...">cupsRGBDoGray</a></li>
<li><a href="#cupsRGBDoRGB" title="Do a RGB separation...">cupsRGBDoRGB</a></li>
<li><a href="#cupsRGBLoad" title="Load a RGB color profile from a PPD file.">cupsRGBLoad</a></li>
<li><a href="#cupsRGBNew" title="Create a new RGB color separation.">cupsRGBNew</a></li>
</ul></li>
<li><a href="#TYPES">Data Types</a><ul class="code">
	<li><a href="#cups_cmyk_t" title="Simple CMYK lookup table">cups_cmyk_t</a></li>
	<li><a href="#cups_dither_t" title="Dithering State">cups_dither_t</a></li>
	<li><a href="#cups_lut_t" title="Lookup Table for Dithering">cups_lut_t</a></li>
	<li><a href="#cups_rgb_t" title="Color separation lookup table">cups_rgb_t</a></li>
	<li><a href="#cups_sample_t" title="Color sample point">cups_sample_t</a></li>
</ul></li>
<li><a href="#STRUCTURES">Structures</a><ul class="code">
	<li><a href="#cups_cmyk_s" title="Simple CMYK lookup table">cups_cmyk_s</a></li>
	<li><a href="#cups_dither_s" title="Dithering State">cups_dither_s</a></li>
	<li><a href="#cups_lut_s" title="Lookup Table for Dithering">cups_lut_s</a></li>
	<li><a href="#cups_rgb_s" title="Color separation lookup table">cups_rgb_s</a></li>
	<li><a href="#cups_sample_s" title="Color sample point">cups_sample_s</a></li>
</ul></li>
<li><a href="#VARIABLES">Variables</a><ul class="code">
	<li><a href="#cups_scmy_lut[256]" title="sRGB gamma lookup table (inverted)">cups_scmy_lut[256]</a></li>
	<li><a href="#cups_srgb_lut[256]" title="sRGB gamma lookup table">cups_srgb_lut[256]</a></li>
</ul></li>
<!--
  "$Id: api-driver.html 8653 2009-05-16 23:53:28Z mike $"

Driver API introduction for CUPS.

<h2 class='title'><a name='OVERVIEW'>Overview</a></h2>

<p>The driver API provides common dithering, color conversion, and utility
functions for CUPS drivers.</p>
<h2 class="title"><a name="FUNCTIONS">Functions</a></h2>
<h3 class="function"><a name="cupsCMYKDelete">cupsCMYKDelete</a></h3>
<p class="description">Delete a color separation.</p>
<p class="code">
void cupsCMYKDelete (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#cups_cmyk_t">cups_cmyk_t</a> *cmyk<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>cmyk</dt>
<dd class="description">Color separation</dd>
</dl>
<h3 class="function"><a name="cupsCMYKDoBlack">cupsCMYKDoBlack</a></h3>
<p class="description">Do a black separation...</p>
<p class="code">
void cupsCMYKDoBlack (<br>
&nbsp;&nbsp;&nbsp;&nbsp;const <a href="#cups_cmyk_t">cups_cmyk_t</a> *cmyk,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char *input,<br>
&nbsp;&nbsp;&nbsp;&nbsp;short *output,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_pixels<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>cmyk</dt>
<dd class="description">Color separation</dd>
<dt>input</dt>
<dd class="description">Input grayscale pixels</dd>
<dt>output</dt>
<dd class="description">Output Device-N pixels</dd>
<dt>num_pixels</dt>
<dd class="description">Number of pixels</dd>
</dl>
<h3 class="function"><a name="cupsCMYKDoCMYK">cupsCMYKDoCMYK</a></h3>
<p class="description">Do a CMYK separation...</p>
<p class="code">
void cupsCMYKDoCMYK (<br>
&nbsp;&nbsp;&nbsp;&nbsp;const <a href="#cups_cmyk_t">cups_cmyk_t</a> *cmyk,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char *input,<br>
&nbsp;&nbsp;&nbsp;&nbsp;short *output,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_pixels<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>cmyk</dt>
<dd class="description">Color separation</dd>
<dt>input</dt>
<dd class="description">Input grayscale pixels</dd>
<dt>output</dt>
<dd class="description">Output Device-N pixels</dd>
<dt>num_pixels</dt>
<dd class="description">Number of pixels</dd>
</dl>
<h3 class="function"><a name="cupsCMYKDoGray">cupsCMYKDoGray</a></h3>
<p class="description">Do a grayscale separation...</p>
<p class="code">
void cupsCMYKDoGray (<br>
&nbsp;&nbsp;&nbsp;&nbsp;const <a href="#cups_cmyk_t">cups_cmyk_t</a> *cmyk,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char *input,<br>
&nbsp;&nbsp;&nbsp;&nbsp;short *output,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_pixels<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>cmyk</dt>
<dd class="description">Color separation</dd>
<dt>input</dt>
<dd class="description">Input grayscale pixels</dd>
<dt>output</dt>
<dd class="description">Output Device-N pixels</dd>
<dt>num_pixels</dt>
<dd class="description">Number of pixels</dd>
</dl>
<h3 class="function"><a name="cupsCMYKDoRGB">cupsCMYKDoRGB</a></h3>
<p class="description">Do an sRGB separation...</p>
<p class="code">
void cupsCMYKDoRGB (<br>
&nbsp;&nbsp;&nbsp;&nbsp;const <a href="#cups_cmyk_t">cups_cmyk_t</a> *cmyk,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char *input,<br>
&nbsp;&nbsp;&nbsp;&nbsp;short *output,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_pixels<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>cmyk</dt>
<dd class="description">Color separation</dd>
<dt>input</dt>
<dd class="description">Input grayscale pixels</dd>
<dt>output</dt>
<dd class="description">Output Device-N pixels</dd>
<dt>num_pixels</dt>
<dd class="description">Number of pixels</dd>
</dl>
<h3 class="function"><a name="cupsCMYKLoad">cupsCMYKLoad</a></h3>
<p class="description">Load a CMYK color profile from PPD attributes.</p>
<p class="code">
<a href="#cups_cmyk_t">cups_cmyk_t</a> *cupsCMYKLoad (<br>
&nbsp;&nbsp;&nbsp;&nbsp;ppd_file_t *ppd,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *colormodel,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *media,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *resolution<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ppd</dt>
<dd class="description">PPD file</dd>
<dt>colormodel</dt>
<dd class="description">ColorModel value</dd>
<dt>media</dt>
<dd class="description">MediaType value</dd>
<dt>resolution</dt>
<dd class="description">Resolution value</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">CMYK color separation</p>
<h3 class="function"><a name="cupsCMYKNew">cupsCMYKNew</a></h3>
<p class="description">Create a new CMYK color separation.</p>
<p class="code">
<a href="#cups_cmyk_t">cups_cmyk_t</a> *cupsCMYKNew (<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_channels<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>num_channels</dt>
<dd class="description">Number of color components</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New CMYK separation or NULL</p>
<h3 class="function"><a name="cupsCMYKSetBlack">cupsCMYKSetBlack</a></h3>
<p class="description">Set the transition range for CMY to black.</p>
<p class="code">
void cupsCMYKSetBlack (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#cups_cmyk_t">cups_cmyk_t</a> *cmyk,<br>
&nbsp;&nbsp;&nbsp;&nbsp;float lower,<br>
&nbsp;&nbsp;&nbsp;&nbsp;float upper<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>cmyk</dt>
<dd class="description">CMYK color separation</dd>
<dt>lower</dt>
<dd class="description">No black ink</dd>
<dt>upper</dt>
<dd class="description">Only black ink</dd>
</dl>
<h3 class="function"><a name="cupsCMYKSetCurve">cupsCMYKSetCurve</a></h3>
<p class="description">Set a color transform curve using points.</p>
<p class="code">
void cupsCMYKSetCurve (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#cups_cmyk_t">cups_cmyk_t</a> *cmyk,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int channel,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_xypoints,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const float *xypoints<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>cmyk</dt>
<dd class="description">CMYK color separation</dd>
<dt>channel</dt>
<dd class="description">Color channel</dd>
<dt>num_xypoints</dt>
<dd class="description">Number of X,Y points</dd>
<dt>xypoints</dt>
<dd class="description">X,Y points</dd>
</dl>
<h3 class="function"><a name="cupsCMYKSetGamma">cupsCMYKSetGamma</a></h3>
<p class="description">Set a color transform curve using gamma and density.</p>
<p class="code">
void cupsCMYKSetGamma (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#cups_cmyk_t">cups_cmyk_t</a> *cmyk,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int channel,<br>
&nbsp;&nbsp;&nbsp;&nbsp;float gamval,<br>
&nbsp;&nbsp;&nbsp;&nbsp;float density<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>cmyk</dt>
<dd class="description">CMYK color separation</dd>
<dt>channel</dt>
<dd class="description">Ink channel</dd>
<dt>gamval</dt>
<dd class="description">Gamma correction</dd>
<dt>density</dt>
<dd class="description">Maximum density</dd>
</dl>
<h3 class="function"><a name="cupsCMYKSetInkLimit">cupsCMYKSetInkLimit</a></h3>
<p class="description">Set the limit on the amount of ink.</p>
<p class="code">
void cupsCMYKSetInkLimit (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#cups_cmyk_t">cups_cmyk_t</a> *cmyk,<br>
&nbsp;&nbsp;&nbsp;&nbsp;float limit<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>cmyk</dt>
<dd class="description">CMYK color separation</dd>
<dt>limit</dt>
<dd class="description">Limit of ink</dd>
</dl>
<h3 class="function"><a name="cupsCMYKSetLtDk">cupsCMYKSetLtDk</a></h3>
<p class="description">Set light/dark ink transforms.</p>
<p class="code">
void cupsCMYKSetLtDk (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#cups_cmyk_t">cups_cmyk_t</a> *cmyk,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int channel,<br>
&nbsp;&nbsp;&nbsp;&nbsp;float light,<br>
&nbsp;&nbsp;&nbsp;&nbsp;float dark<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>cmyk</dt>
<dd class="description">CMYK color separation</dd>
<dt>channel</dt>
<dd class="description">Dark ink channel (+1 for light)</dd>
<dt>light</dt>
<dd class="description">Light ink only level</dd>
<dt>dark</dt>
<dd class="description">Dark ink only level</dd>
</dl>
<h3 class="function"><a name="cupsCheckBytes">cupsCheckBytes</a></h3>
<p class="description">Check to see if all bytes are zero.</p>
<p class="code">
int cupsCheckBytes (<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char *bytes,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int length<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>bytes</dt>
<dd class="description">Bytes to check</dd>
<dt>length</dt>
<dd class="description">Number of bytes to check</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">1 if they match</p>
<h3 class="function"><a name="cupsCheckValue">cupsCheckValue</a></h3>
<p class="description">Check to see if all bytes match the given value.</p>
<p class="code">
int cupsCheckValue (<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char *bytes,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int length,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char value<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>bytes</dt>
<dd class="description">Bytes to check</dd>
<dt>length</dt>
<dd class="description">Number of bytes to check</dd>
<dt>value</dt>
<dd class="description">Value to check</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">1 if they match</p>
<h3 class="function"><a name="cupsDitherDelete">cupsDitherDelete</a></h3>
<p class="description">Free a dithering buffer.</p>
<p class="code">
void cupsDitherDelete (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#cups_dither_t">cups_dither_t</a> *d<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>d</dt>
<dd class="description">Dithering buffer</dd>
</dl>
<h4 class="discussion">Discussion</h4>
<p class="discussion">Returns 0 on success, -1 on failure.</p>
<h3 class="function"><a name="cupsDitherLine">cupsDitherLine</a></h3>
<p class="description">Dither a line of pixels...</p>
<p class="code">
void cupsDitherLine (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#cups_dither_t">cups_dither_t</a> *d,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const <a href="#cups_lut_t">cups_lut_t</a> *lut,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const short *data,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_channels,<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char *p<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>d</dt>
<dd class="description">Dither data</dd>
<dt>lut</dt>
<dd class="description">Lookup table</dd>
<dt>data</dt>
<dd class="description">Separation data</dd>
<dt>num_channels</dt>
<dd class="description">Number of components</dd>
<dt>p</dt>
<dd class="description">Pixels</dd>
</dl>
<h3 class="function"><a name="cupsDitherNew">cupsDitherNew</a></h3>
<p class="description">Create an error-diffusion dithering buffer.</p>
<p class="code">
<a href="#cups_dither_t">cups_dither_t</a> *cupsDitherNew (<br>
&nbsp;&nbsp;&nbsp;&nbsp;int width<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>width</dt>
<dd class="description">Width of output in pixels</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New state array</p>
<h3 class="function"><a name="cupsFindAttr">cupsFindAttr</a></h3>
<p class="description">Find a PPD attribute based on the colormodel,
media, and resolution.</p>
<p class="code">
ppd_attr_t *cupsFindAttr (<br>
&nbsp;&nbsp;&nbsp;&nbsp;ppd_file_t *ppd,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *name,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *colormodel,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *media,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *resolution,<br>
&nbsp;&nbsp;&nbsp;&nbsp;char *spec,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int specsize<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ppd</dt>
<dd class="description">PPD file</dd>
<dt>name</dt>
<dd class="description">Attribute name</dd>
<dt>colormodel</dt>
<dd class="description">Color model</dd>
<dt>media</dt>
<dd class="description">Media type</dd>
<dt>resolution</dt>
<dd class="description">Resolution</dd>
<dt>spec</dt>
<dd class="description">Final selection string</dd>
<dt>specsize</dt>
<dd class="description">Size of string buffer</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Matching attribute or NULL</p>
<h3 class="function"><a name="cupsLutDelete">cupsLutDelete</a></h3>
<p class="description">Free the memory used by a lookup table.</p>
<p class="code">
void cupsLutDelete (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#cups_lut_t">cups_lut_t</a> *lut<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>lut</dt>
<dd class="description">Lookup table to free</dd>
</dl>
<h3 class="function"><a name="cupsLutLoad">cupsLutLoad</a></h3>
<p class="description">Load a LUT from a PPD file.</p>
<p class="code">
<a href="#cups_lut_t">cups_lut_t</a> *cupsLutLoad (<br>
&nbsp;&nbsp;&nbsp;&nbsp;ppd_file_t *ppd,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *colormodel,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *media,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *resolution,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *ink<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ppd</dt>
<dd class="description">PPD file</dd>
<dt>colormodel</dt>
<dd class="description">Color model</dd>
<dt>media</dt>
<dd class="description">Media type</dd>
<dt>resolution</dt>
<dd class="description">Resolution</dd>
<dt>ink</dt>
<dd class="description">Ink name</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New lookup table</p>
<h3 class="function"><a name="cupsLutNew">cupsLutNew</a></h3>
<p class="description">Make a lookup table from a list of pixel values.</p>
<p class="code">
<a href="#cups_lut_t">cups_lut_t</a> *cupsLutNew (<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_values,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const float *values<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>num_values</dt>
<dd class="description">Number of values</dd>
<dt>values</dt>
<dd class="description">Lookup table values</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New lookup table</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">Returns a pointer to the lookup table on success, NULL on failure.</p>
<h3 class="function"><a name="cupsPackHorizontal">cupsPackHorizontal</a></h3>
<p class="description">Pack pixels horizontally...</p>
<p class="code">
void cupsPackHorizontal (<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char *ipixels,<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char *obytes,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int width,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char clearto,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const int step<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipixels</dt>
<dd class="description">Input pixels</dd>
<dt>obytes</dt>
<dd class="description">Output bytes</dd>
<dt>width</dt>
<dd class="description">Number of pixels</dd>
<dt>clearto</dt>
<dd class="description">Initial value of bytes</dd>
<dt>step</dt>
<dd class="description">Step value between pixels</dd>
</dl>
<h3 class="function"><a name="cupsPackHorizontal2">cupsPackHorizontal2</a></h3>
<p class="description">Pack 2-bit pixels horizontally...</p>
<p class="code">
void cupsPackHorizontal2 (<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char *ipixels,<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char *obytes,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int width,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const int step<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipixels</dt>
<dd class="description">Input pixels</dd>
<dt>obytes</dt>
<dd class="description">Output bytes</dd>
<dt>width</dt>
<dd class="description">Number of pixels</dd>
<dt>step</dt>
<dd class="description">Stepping value</dd>
</dl>
<h3 class="function"><a name="cupsPackHorizontalBit">cupsPackHorizontalBit</a></h3>
<p class="description">Pack pixels horizontally by bit...</p>
<p class="code">
void cupsPackHorizontalBit (<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char *ipixels,<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char *obytes,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int width,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char clearto,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char bit<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipixels</dt>
<dd class="description">Input pixels</dd>
<dt>obytes</dt>
<dd class="description">Output bytes</dd>
<dt>width</dt>
<dd class="description">Number of pixels</dd>
<dt>clearto</dt>
<dd class="description">Initial value of bytes</dd>
<dt>bit</dt>
<dd class="description">Bit to check</dd>
</dl>
<h3 class="function"><a name="cupsPackVertical">cupsPackVertical</a></h3>
<p class="description">Pack pixels vertically...</p>
<p class="code">
void cupsPackVertical (<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char *ipixels,<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char *obytes,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int width,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char bit,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const int step<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipixels</dt>
<dd class="description">Input pixels</dd>
<dt>obytes</dt>
<dd class="description">Output bytes</dd>
<dt>width</dt>
<dd class="description">Number of input pixels</dd>
<dt>bit</dt>
<dd class="description">Output bit</dd>
<dt>step</dt>
<dd class="description">Number of bytes between columns</dd>
</dl>
<h3 class="function"><a name="cupsRGBDelete">cupsRGBDelete</a></h3>
<p class="description">Delete a color separation.</p>
<p class="code">
void cupsRGBDelete (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#cups_rgb_t">cups_rgb_t</a> *rgbptr<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>rgbptr</dt>
<dd class="description">Color separation</dd>
</dl>
<h3 class="function"><a name="cupsRGBDoGray">cupsRGBDoGray</a></h3>
<p class="description">Do a grayscale separation...</p>
<p class="code">
void cupsRGBDoGray (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#cups_rgb_t">cups_rgb_t</a> *rgbptr,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char *input,<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char *output,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_pixels<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>rgbptr</dt>
<dd class="description">Color separation</dd>
<dt>input</dt>
<dd class="description">Input grayscale pixels</dd>
<dt>output</dt>
<dd class="description">Output Device-N pixels</dd>
<dt>num_pixels</dt>
<dd class="description">Number of pixels</dd>
</dl>
<h3 class="function"><a name="cupsRGBDoRGB">cupsRGBDoRGB</a></h3>
<p class="description">Do a RGB separation...</p>
<p class="code">
void cupsRGBDoRGB (<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#cups_rgb_t">cups_rgb_t</a> *rgbptr,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const unsigned char *input,<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char *output,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_pixels<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>rgbptr</dt>
<dd class="description">Color separation</dd>
<dt>input</dt>
<dd class="description">Input RGB pixels</dd>
<dt>output</dt>
<dd class="description">Output Device-N pixels</dd>
<dt>num_pixels</dt>
<dd class="description">Number of pixels</dd>
</dl>
<h3 class="function"><a name="cupsRGBLoad">cupsRGBLoad</a></h3>
<p class="description">Load a RGB color profile from a PPD file.</p>
<p class="code">
<a href="#cups_rgb_t">cups_rgb_t</a> *cupsRGBLoad (<br>
&nbsp;&nbsp;&nbsp;&nbsp;ppd_file_t *ppd,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *colormodel,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *media,<br>
&nbsp;&nbsp;&nbsp;&nbsp;const char *resolution<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ppd</dt>
<dd class="description">PPD file</dd>
<dt>colormodel</dt>
<dd class="description">Color model</dd>
<dt>media</dt>
<dd class="description">Media type</dd>
<dt>resolution</dt>
<dd class="description">Resolution</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New color profile</p>
<h3 class="function"><a name="cupsRGBNew">cupsRGBNew</a></h3>
<p class="description">Create a new RGB color separation.</p>
<p class="code">
<a href="#cups_rgb_t">cups_rgb_t</a> *cupsRGBNew (<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_samples,<br>
&nbsp;&nbsp;&nbsp;&nbsp;<a href="#cups_sample_t">cups_sample_t</a> *samples,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int cube_size,<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_channels<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>num_samples</dt>
<dd class="description">Number of samples</dd>
<dt>samples</dt>
<dd class="description">Samples</dd>
<dt>cube_size</dt>
<dd class="description">Size of LUT cube</dd>
<dt>num_channels</dt>
<dd class="description">Number of color components</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New color separation or NULL</p>
<h2 class="title"><a name="TYPES">Data Types</a></h2>
<h3 class="typedef"><a name="cups_cmyk_t">cups_cmyk_t</a></h3>
<p class="description">Simple CMYK lookup table</p>
<p class="code">
typedef struct <a href="#cups_cmyk_s">cups_cmyk_s</a> cups_cmyk_t;
</p>
<h3 class="typedef"><a name="cups_dither_t">cups_dither_t</a></h3>
<p class="description">Dithering State</p>
<p class="code">
typedef struct <a href="#cups_dither_s">cups_dither_s</a> cups_dither_t;
</p>
<h3 class="typedef"><a name="cups_lut_t">cups_lut_t</a></h3>
<p class="description">Lookup Table for Dithering</p>
<p class="code">
typedef struct <a href="#cups_lut_s">cups_lut_s</a> cups_lut_t;
</p>
<h3 class="typedef"><a name="cups_rgb_t">cups_rgb_t</a></h3>
<p class="description">Color separation lookup table</p>
<p class="code">
typedef struct <a href="#cups_rgb_s">cups_rgb_s</a> cups_rgb_t;
</p>
<h3 class="typedef"><a name="cups_sample_t">cups_sample_t</a></h3>
<p class="description">Color sample point</p>
<p class="code">
typedef struct <a href="#cups_sample_s">cups_sample_s</a> cups_sample_t;
</p>
<h2 class="title"><a name="STRUCTURES">Structures</a></h2>
<h3 class="struct"><a name="cups_cmyk_s">cups_cmyk_s</a></h3>
<p class="description">Simple CMYK lookup table</p>
<p class="code">struct cups_cmyk_s {<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char black_lut[256];<br>
&nbsp;&nbsp;&nbsp;&nbsp;short *channels[CUPS_MAX_CHAN];<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char color_lut[256];<br>
&nbsp;&nbsp;&nbsp;&nbsp;int ink_limit;<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_channels;<br>
};</p>
<h4 class="members">Members</h4>
<dl>
<dt>black_lut[256] </dt>
<dd class="description">Black generation LUT</dd>
<dt>channels[CUPS_MAX_CHAN] </dt>
<dd class="description">Lookup tables</dd>
<dt>color_lut[256] </dt>
<dd class="description">Color removal LUT</dd>
<dt>ink_limit </dt>
<dd class="description">Ink limit</dd>
<dt>num_channels </dt>
<dd class="description">Number of components</dd>
</dl>
<h3 class="struct"><a name="cups_dither_s">cups_dither_s</a></h3>
<p class="description">Dithering State</p>
<p class="code">struct cups_dither_s {<br>
&nbsp;&nbsp;&nbsp;&nbsp;int errors[96];<br>
&nbsp;&nbsp;&nbsp;&nbsp;int row;<br>
&nbsp;&nbsp;&nbsp;&nbsp;int width;<br>
};</p>
<h4 class="members">Members</h4>
<dl>
<dt>errors[96] </dt>
<dd class="description">Error values</dd>
<dt>row </dt>
<dd class="description">Current row</dd>
<dt>width </dt>
<dd class="description">Width of buffer</dd>
</dl>
<h3 class="struct"><a name="cups_lut_s">cups_lut_s</a></h3>
<p class="description">Lookup Table for Dithering</p>
<p class="code">struct cups_lut_s {<br>
&nbsp;&nbsp;&nbsp;&nbsp;int error;<br>
&nbsp;&nbsp;&nbsp;&nbsp;short intensity;<br>
&nbsp;&nbsp;&nbsp;&nbsp;short pixel;<br>
};</p>
<h4 class="members">Members</h4>
<dl>
<dt>error </dt>
<dd class="description">Error from desired value</dd>
<dt>intensity </dt>
<dd class="description">Adjusted intensity</dd>
<dt>pixel </dt>
<dd class="description">Output pixel value</dd>
</dl>
<h3 class="struct"><a name="cups_rgb_s">cups_rgb_s</a></h3>
<p class="description">Color separation lookup table</p>
<p class="code">struct cups_rgb_s {<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char black[CUPS_MAX_RGB];<br>
&nbsp;&nbsp;&nbsp;&nbsp;int cache_init;<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char ****colors;<br>
&nbsp;&nbsp;&nbsp;&nbsp;int cube_index[256];<br>
&nbsp;&nbsp;&nbsp;&nbsp;int cube_mult[256];<br>
&nbsp;&nbsp;&nbsp;&nbsp;int cube_size;<br>
&nbsp;&nbsp;&nbsp;&nbsp;int num_channels;<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char white[CUPS_MAX_RGB];<br>
};</p>
<h4 class="members">Members</h4>
<dl>
<dt>black[CUPS_MAX_RGB] </dt>
<dd class="description">Cached black (sRGB = 0,0,0)</dd>
<dt>cache_init </dt>
<dd class="description">Are cached values initialized?</dd>
<dt>colors </dt>
<dd class="description">4-D array of sample values</dd>
<dt>cube_index[256] </dt>
<dd class="description">Index into cube for a given sRGB value</dd>
<dt>cube_mult[256] </dt>
<dd class="description">Multiplier value for a given sRGB value</dd>
<dt>cube_size </dt>
<dd class="description">Size of color cube (2-N) on a side</dd>
<dt>num_channels </dt>
<dd class="description">Number of colors per sample</dd>
<dt>white[CUPS_MAX_RGB] </dt>
<dd class="description">Cached white (sRGB = 255,255,255)</dd>
</dl>
<h3 class="struct"><a name="cups_sample_s">cups_sample_s</a></h3>
<p class="description">Color sample point</p>
<p class="code">struct cups_sample_s {<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char colors[CUPS_MAX_RGB];<br>
&nbsp;&nbsp;&nbsp;&nbsp;unsigned char rgb[3];<br>
};</p>
<h4 class="members">Members</h4>
<dl>
<dt>colors[CUPS_MAX_RGB] </dt>
<dd class="description">Color values</dd>
<dt>rgb[3] </dt>
<dd class="description">sRGB values</dd>
</dl>
<h2 class="title"><a name="VARIABLES">Variables</a></h2>
<h3 class="variable"><a name="cups_scmy_lut[256]">cups_scmy_lut[256]</a></h3>
<p class="description">sRGB gamma lookup table (inverted)</p>
<p class="code">extern const unsigned char cups_scmy_lut[256];</p>
<h3 class="variable"><a name="cups_srgb_lut[256]">cups_srgb_lut[256]</a></h3>
<p class="description">sRGB gamma lookup table</p>
<p class="code">extern const unsigned char cups_srgb_lut[256];</p>
</div>
</body>
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