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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)_C_
-_header(GetConvolutionFilter,get current 1D or 2D convolution filter kernel)
-_names(GetConvolutionFilter)
-_define(@<__target>@,@<_param1>@)_C_
-_define(@<__format>@,@<_param2>@)_C_
-_define(@<__type>@,@<_param3>@)_C_
-_define(@<__image>@,@<_param4>@)_C_
-.SH PARAMETERS
-_phead(__target)
-The filter to be retrieved.
-Must be one of
-_const(CONVOLUTION_1D) or
-_const(CONVOLUTION_2D).
-_phead(__format)
-Format of the output image.
-Must be one of
-_const(RED),
-_const(GREEN),
-_const(BLUE),
-_const(ALPHA),
-_const(RGB),
-_const(BGR),
-_const(RGBA),
-_const(BGRA),
-_const(LUMINANCE), or
-_const(LUMINANCE_ALPHA).
-_phead(__type)
-Data type of components in the output image.
-Symbolic constants
-_const(UNSIGNED_BYTE),
-_const(BYTE),
-_const(BITMAP),
-_const(UNSIGNED_SHORT),
-_const(SHORT),
-_const(UNSIGNED_INT),
-_const(INT),
-_const(FLOAT),
-_const(UNSIGNED_BYTE_3_3_2),
-_const(UNSIGNED_BYTE_2_3_3_REV),
-_const(UNSIGNED_SHORT_5_6_5),
-_const(UNSIGNED_SHORT_5_6_5_REV),
-_const(UNSIGNED_SHORT_4_4_4_4),
-_const(UNSIGNED_SHORT_4_4_4_4_REV),
-_const(UNSIGNED_SHORT_5_5_5_1),
-_const(UNSIGNED_SHORT_1_5_5_5_REV),
-_const(UNSIGNED_INT_8_8_8_8),
-_const(UNSIGNED_INT_8_8_8_8_REV),
-_const(UNSIGNED_INT_10_10_10_2), and
-_const(UNSIGNED_INT_2_10_10_10_REV)
-are accepted.
-_phead(__image)
-Pointer to storage for the output image.
-.SH DESCRIPTION
-_cmnd returns the current 1D or 2D convolution filter kernel as an image.
-The one- or two-dimensional image is placed in __image according to the
-specifications in __format and __type.
-No pixel transfer operations are performed on this image, but the relevant
-pixel storage modes are applied.
-.sp
-Color components that are present in __format but not included in the
-internal format of the filter are returned as zero.
-The assignments of internal color components to the components of __format
-are as follows.
-.br
-.bp
-.TS
-center;
-lb lb
-l l.
-_
-Internal Component Resulting Component
-_
-Red Red
-Green Green
-Blue Blue
-Alpha Alpha
-Luminance Red
-Intensity Red
-_
-.TE
-.SH NOTES
-_cmnd is present only if _arbstring(imaging) is returned when _cmnd(GetString)
-is called with an argument of _const(EXTENSIONS).
-.P
-The current separable 2D filter must be retrieved with
-_cmnd(GetSeparableFilter) rather than _cmnd.
-.SH ERRORS
-_const(INVALID_ENUM) is generated if __target is not one of the allowable
-values.
-.P
-_const(INVALID_ENUM) is generated if __format is not one of the allowable
-values.
-.P
-_const(INVALID_ENUM) is generated if __type is not one of the allowable
-values.
-.P
-_const(INVALID_OPERATION) is generated if _cmnd is executed
-between the execution of _cmnd(Begin) and the corresponding
-execution of _cmnd(End).
-.P
-_const(INVALID_OPERATION) is generated if _param3 is one of
-_const(UNSIGNED_BYTE_3_3_2),
-_const(UNSIGNED_BYTE_2_3_3_REV),
-_const(UNSIGNED_SHORT_5_6_5), or
-_const(UNSIGNED_SHORT_5_6_5_REV)
-and _param2 is not _const(RGB).
-.P
-_const(INVALID_OPERATION) is generated if _param3 is one of
-_const(UNSIGNED_SHORT_4_4_4_4),
-_const(UNSIGNED_SHORT_4_4_4_4_REV),
-_const(UNSIGNED_SHORT_5_5_5_1),
-_const(UNSIGNED_SHORT_1_5_5_5_REV),
-_const(UNSIGNED_INT_8_8_8_8),
-_const(UNSIGNED_INT_8_8_8_8_REV),
-_const(UNSIGNED_INT_10_10_10_2), or
-_const(UNSIGNED_INT_2_10_10_10_REV)
-and _param2 is neither _const(RGBA) nor _const(BGRA).
-.SH ASSOCIATED GETS
-_cmnd(GetConvolutionParameter)
-.SH SEE ALSO
-_cmnd(GetSeparableFilter),
-_cmnd(ConvolutionParameter),
-_cmnd(ConvolutionFilter1D),
-_cmnd(ConvolutionFilter2D)