89 lines
3.6 KiB
HTML
89 lines
3.6 KiB
HTML
<head>
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<title>color(3) - Plan 9 from User Space</title>
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<meta content="text/html; charset=utf-8" http-equiv=Content-Type>
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</head>
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<body bgcolor=#ffffff>
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<table border=0 cellpadding=0 cellspacing=0 width=100%>
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<tr height=10><td>
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<tr><td width=20><td>
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<tr><td width=20><td><b>COLOR(3)</b><td align=right><b>COLOR(3)</b>
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<tr><td width=20><td colspan=2>
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<br>
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<p><font size=+1><b>NAME </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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cmap2rgb, cmap2rgba, rgb2cmap – colors and color maps<br>
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</table>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<tt><font size=+1>#include <u.h><br>
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#include <libc.h><br>
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#include <draw.h>
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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</font></tt>
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<tt><font size=+1>int rgb2cmap(int red, int green, int blue)
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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</font></tt>
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<tt><font size=+1>int cmap2rgb(int col)
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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</font></tt>
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<tt><font size=+1>int cmap2rgba(int col)<br>
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</font></tt>
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</table>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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These routines convert between ‘true color’ red/green/blue triples
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and the Plan 9 color map. See <a href="../man7/color.html"><i>color</i>(7)</a> for a description of RGBV,
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the standard color map.
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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<i>Rgb2cmap</i> takes a trio of color values, scaled from 0 (no intensity)
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to 255 (full intensity), and returns the index of the color in
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RGBV closest to that represented by those values.
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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<i>Cmap2rgb</i> decomposes the color of RGBV index <i>col</i> and returns a
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24-bit integer with the low 8 bits representing the blue value,
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the next 8 representing green, and the next 8 representing red.
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<i>Cmap2rgba</i> decomposes the color of RGBV index <i>col</i> and returns a
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32-bit integer with the low 8 bits representing an alpha
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value, defined to be 255, and the next 8 representing blue, then
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green, then red, as for <i>cmap2rgba</i> shifted up 8 bits. This 32-bit
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representation is the format used by <a href="../man3/draw.html"><i>draw</i>(3)</a> and <a href="../man3/memdraw.html"><i>memdraw</i>(3)</a> library
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routines that take colors as arguments.<br>
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</table>
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<p><font size=+1><b>SOURCE </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<tt><font size=+1>/usr/local/plan9/src/libdraw<br>
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</font></tt>
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</table>
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<p><font size=+1><b>SEE ALSO </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<a href="../man3/graphics.html"><i>graphics</i>(3)</a>, <a href="../man3/allocimage.html"><i>allocimage</i>(3)</a>, <a href="../man3/draw.html"><i>draw</i>(3)</a>, <a href="../man7/image.html"><i>image</i>(7)</a>, <a href="../man7/color.html"><i>color</i>(7)</a><br>
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</table>
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<td width=20>
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<tr height=20><td>
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</table>
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<!-- TRAILER -->
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<table border=0 cellpadding=0 cellspacing=0 width=100%>
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<tr height=15><td width=10><td><td width=10>
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<tr><td><td>
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<center>
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<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a>
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</center>
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</table>
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<!-- TRAILER -->
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</body></html>
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