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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_ $Date: 2004/03/14 08:29:09 $ $Revision: 1.1.1.4 $
_C_ The first character in this file must be an '_'!
_C_ Anything on a line after _C_ is ignored
_define(_filters,eqn)_C_
_C_ eqn is automatically replaced with neqn for nroff
_header(ScaleImage, scale an image to an arbitrary size)
_names(ScaleImage)
.EQ
delim $$
.EN
.SH PARAMETERS
_phead(_param1)
Specifies the format of the pixel data.
The following symbolic values are valid:
_const(COLOR_INDEX),
_const(STENCIL_INDEX),
_const(DEPTH_COMPONENT),
_const(RED),
_const(GREEN),
_const(BLUE),
_const(ALPHA),
_const(RGB),
_const(RGBA),
_const(BGR),
_const(BGRA),
_const(LUMINANCE), and
_const(LUMINANCE_ALPHA).
_phead(_param2 _param3)
Specify in pixels the width and height, respectively, of the source image.
_phead(_param4)
Specifies the data type for _param5. Must be one of
_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).
_phead(_param5)
Specifies a pointer to the source image.
_phead(_param6 _param7)
Specify the width and height, respectively, in pixels of the destination image.
_phead(_param8)
Specifies the data type for _param9. Must be one of
_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), or
_const(UNSIGNED_INT_2_10_10_10_REV).
_phead(_param9)
Specifies a pointer to the destination image.
.SH DESCRIPTION
_cmnd scales a pixel image using the appropriate pixel store modes to
unpack data from the source image and pack data into the destination image.
.P
When shrinking an image, _cmnd uses a box filter to sample the source image
and create pixels for the destination image. When magnifying an image,
the pixels from the source image are linearly interpolated to create the
destination image.
.P
A return value of zero indicates success, otherwise a GLU error code is returned (see _cmnd(ErrorString)).
.P
See the _glcmnd(ReadPixels) reference page for a description of
the acceptable values for the _param1, _param4, and _param8 parameters.
.SH NOTES
Formats _const(BGR), and _const(BGRA), and types
_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 only available if the GL version
is 1.2 or greater.
.SH ERRORS
_gluconst(INVALID_VALUE) is returned if _param2, _param3, _param6, or _param7
is negative.
.P
_gluconst(INVALID_ENUM) is returned if _param1, _param4, or _param8 is not
legal.
.P
_gluconst(INVALID_OPERATION) is returned if _param4 or _param8 is
_const(UNSIGNED_BYTE_3_3_2) or _const(UNSIGNED_BYTE_2_3_3_REV)
and _param1 is not _const(RGB).
.P
_gluconst(INVALID_OPERATION) is returned if _param4 or _param8 is
_const(UNSIGNED_SHORT_5_6_5) or _const(UNSIGNED_SHORT_5_6_5_REV)
and _param1 is not _const(RGB).
.P
_gluconst(INVALID_OPERATION) is returned if _param4 or _param8 is
_const(UNSIGNED_SHORT_4_4_4_4) or _const(UNSIGNED_SHORT_4_4_4_4_REV)
and _param1 is neither _const(RGBA) nor _const(BGRA).
.P
_gluconst(INVALID_OPERATION) is returned if _param4 or _param8 is
_const(UNSIGNED_SHORT_5_5_5_1) or _const(UNSIGNED_SHORT_1_5_5_5_REV)
and _param1 is neither _const(RGBA) nor _const(BGRA).
.P
_gluconst(INVALID_OPERATION) is returned if _param4 or _param8 is
_const(UNSIGNED_INT_8_8_8_8) or _const(UNSIGNED_INT_8_8_8_8_REV)
and _param1 is neither _const(RGBA) nor _const(BGRA).
.P
_gluconst(INVALID_OPERATION) is returned if _param4 or _param8 is
_const(UNSIGNED_INT_10_10_10_2) or _const(UNSIGNED_INT_2_10_10_10_REV)
and _param1 is neither _const(RGBA) nor _const(BGRA).
.SH SEE ALSO
_glcmnd(DrawPixels), _glcmnd(ReadPixels), _cmnd(Build1DMipmaps), _cmnd(Build2DMipmaps),
_cmnd(Build3DMipmaps),
.BR
_cmnd(ErrorString)
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