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gluScaleImage()						       gluScaleImage()

NAME
       gluScaleImage - scale an image to an arbitrary size

SYNOPSIS
       GLint gluScaleImage(
	       GLenum format,
	       GLsizei wIn,
	       GLsizei hIn,
	       GLenum typeIn,
	       const void *dataIn,
	       GLsizei wOut,
	       GLsizei hOut,
	       GLenum typeOut,
	       GLvoid* dataOut );

PARAMETERS
       Specifies  the  format of the pixel data. The following symbolic values
       are  valid:   GL_COLOR_INDEX,   GL_STENCIL_INDEX,   GL_DEPTH_COMPONENT,
       GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA, GL_RGB, GL_RGBA, GL_LUMINANCE, and
       GL_LUMINANCE_ALPHA.  Specify the width and height, respectively, of the
       source  image that is scaled.  Specifies the data type for dataIn. Must
       be one  of  GL_UNSIGNED_BYTE,  GL_BYTE,	GL_BITMAP,  GL_UNSIGNED_SHORT,
       GL_SHORT, GL_UNSIGNED_INT, GL_INT, or GL_FLOAT.	Specifies a pointer to
       the source image.  Specify the width and height, respectively,  of  the
       destination image.  Specifies the data type for dataOut. Must be one of
       GL_UNSIGNED_BYTE,  GL_BYTE,  GL_BITMAP,	GL_UNSIGNED_SHORT,   GL_SHORT,
       GL_UNSIGNED_INT,	 GL_INT, or GL_FLOAT.  Specifies a pointer to the des‐
       tination image.

DESCRIPTION
       gluScaleImage() scales a pixel image using the appropriate pixel	 store
       modes  to unpack data from the source image and pack data into the des‐
       tination image.

       When shrinking an image, gluScaleImage() 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.

       A  return  value	 of 0 indicates success, otherwise a GLU error code is
       returned (see gluErrorString()).

       See the glReadPixels() reference page for a description of the  accept‐
       able values for format, typeIn, and typeOut.

ERRORS
       GLU_INVALID_VALUE is returned if wIn, hIn, wOut, or hOut are < 0.

       GLU_INVALID_ENUM	 is  returned  if  format,  typeIn, or typeOut are not
       legal.

SEE ALSO
       glReadPixels(3),		glDrawPixels(3),	 gluBuild1DMipmaps(3),
       gluBuild2DMipmaps(3), gluErrorString(3)

							       gluScaleImage()

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