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+_C_ License Applicability. Except to the extent portions of this file are
+_C_ made subject to an alternative license as permitted in the SGI Free
+_C_ Software License B, Version 1.1 (the "License"), the contents of this
+_C_ file are subject only to the provisions of the License. You may not use
+_C_ this file except in compliance with the License. You may obtain a copy
+_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+_C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+_C_ 
+_C_ http://oss.sgi.com/projects/FreeB
+_C_ 
+_C_ Note that, as provided in the License, the Software is distributed on an
+_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+_C_ 
+_C_ Original Code. The Original Code is: OpenGL Sample Implementation,
+_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+_C_ Copyright in any portions created by third parties is as indicated
+_C_ elsewhere herein. All Rights Reserved.
+_C_ 
+_C_ Additional Notice Provisions: The application programming interfaces
+_C_ established by SGI in conjunction with the Original Code are The
+_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+_C_ Window System(R) (Version 1.3), released October 19, 1998. This software
+_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation
+_C_ published by SGI, but has not been independently verified as being
+_C_ compliant with the OpenGL(R) version 1.2.1 Specification.
+_C_
+_C_ The first character in this file must be an '_'!
+_C_ Anything on a line after _C_ is ignored
+_define(_filters,tbl | eqn)_C_
+_C_      eqn is automatically replaced with neqn for nroff
+_header(CopyColorTable,copy pixels into a color table)
+_names(CopyColorTable)
+.EQ
+delim $$
+.EN
+.SH PARAMETERS
+_define(@<__target>@,@<_param1>@)_C_
+_define(@<__internalformat>@,@<_param2>@)_C_
+_define(@<__x>@,@<_param3>@)_C_
+_define(@<__y>@,@<_param4>@)_C_
+_define(@<__width>@,@<_param5>@)_C_
+_phead(__target)
+The color table target. Must be
+_const(COLOR_TABLE),
+_const(POST_CONVOLUTION_COLOR_TABLE),
+or _const(POST_COLOR_MATRIX_COLOR_TABLE).
+_phead(__internalformat)
+The internal storage format of the texture image.
+Must be one of the following symbolic constants:
+_const(ALPHA),
+_const(ALPHA4),
+_const(ALPHA8),
+_const(ALPHA12),
+_const(ALPHA16),
+_const(LUMINANCE),
+_const(LUMINANCE4),
+_const(LUMINANCE8),
+_const(LUMINANCE12),
+_const(LUMINANCE16),
+_const(LUMINANCE_ALPHA),
+_const(LUMINANCE4_ALPHA4),
+_const(LUMINANCE6_ALPHA2),
+_const(LUMINANCE8_ALPHA8),
+_const(LUMINANCE12_ALPHA4),
+_const(LUMINANCE12_ALPHA12),
+_const(LUMINANCE16_ALPHA16),
+_const(INTENSITY),
+_const(INTENSITY4),
+_const(INTENSITY8),
+_const(INTENSITY12),
+_const(INTENSITY16),
+_const(R3_G3_B2),
+_const(RGB),
+_const(RGB4),
+_const(RGB5),
+_const(RGB8),
+_const(RGB10),
+_const(RGB12),
+_const(RGB16),
+_const(RGBA),
+_const(RGBA2),
+_const(RGBA4),
+_const(RGB5_A1),
+_const(RGBA8),
+_const(RGB10_A2),
+_const(RGBA12),
+_const(RGBA16).
+_phead(__x)
+The x coordinate of the lower-left corner of the pixel rectangle
+to be transferred to the color table.
+_phead(__y)
+The y coordinate of the lower-left corner of the pixel rectangle
+to be transferred to the color table.
+_phead(__width)
+The width of the pixel rectangle.
+.SH DESCRIPTION
+_cmnd loads a color table with pixels from the current
+_const(READ_BUFFER) (rather than from main memory, as is the case for
+_cmnd(ColorTable)).
+.P
+The screen-aligned pixel rectangle with lower-left corner at (__x,\ __y)
+having width __width and height 1
+is loaded into the color table. If any pixels within
+this region are outside the window that is associated with the GL
+context, the values obtained for those pixels are undefined.
+.P
+The pixels in the rectangle are processed just as if
+_cmnd(ReadPixels) were called, with __internalformat set to RGBA, 
+but processing stops after the final conversion to RGBA.
+.P
+The four scale parameters and the four bias parameters that are defined
+for the table are then used to scale and bias the R, G, B, and A components
+of each pixel. The scale and bias parameters are set by calling
+_cmnd(ColorTableParameter).
+.P
+Next, the R, G, B, and A values are clamped to the range [0,1].
+Each pixel is then converted to the internal format specified by
+__internalformat. This conversion simply maps the component values of the pixel (R, G, B,
+and A) to the values included in the internal format (red, green, blue,
+alpha, luminance, and intensity).  The mapping is as follows:
+.P
+.TS
+center;
+lb cb cb cb cb cb cb
+l c c c c c c.
+_
+Internal Format	Red	Green	Blue	Alpha	Luminance	Intensity
+_
+_const(ALPHA)				A
+_const(LUMINANCE)					R
+_const(LUMINANCE_ALPHA)				A	R
+_const(INTENSITY)						R
+_const(RGB)	R	G	B
+_const(RGBA)	R	G	B	A
+_
+.TE
+.P
+Finally, the red, green, blue, alpha, luminance, and/or intensity components of
+the resulting pixels are stored in the color table.
+They form a one-dimensional table with indices in the range
+[0,\ __width\ \-\ 1].
+.P
+.SH NOTES
+_cmnd is available only if _arbstring(imaging) is returned from calling
+_cmnd(GetString) with an argument of _const(EXTENSIONS).
+.SH ERRORS
+_const(INVALID_ENUM) is generated when __target is not one of the
+allowable values.
+.P
+_const(INVALID_VALUE) is generated if __width is less than zero.
+.P
+_const(INVALID_VALUE) is generated if __internalformat is not one of the
+allowable values.
+.P
+_const(TABLE_TOO_LARGE) is generated if the requested color table
+is too large to be supported by the implementation.
+.P
+_const(INVALID_OPERATION) is generated if _cmnd is executed
+between the execution of _cmnd(Begin) and the corresponding
+execution of _cmnd(End).
+.SH ASSOCIATED GETS
+_cmnd(GetColorTable),
+_cmnd(GetColorTableParameter)
+.SH SEE ALSO
+_cmnd(ColorTable),
+_cmnd(ColorTableParameter),
+_cmnd(ReadPixels)