134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
/* grey ramps
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*
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* Copyright: 1990, N. Dessipris.
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*
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* Author: Nicos Dessipris
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* Written on: 02/02/1990
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* Modified on:
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* 22/7/93 JC
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* - im_outcheck() added
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* - externs removed
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* 8/2/95 JC
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* - ANSIfied
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* - im_fgrey() made from im_grey()
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* 31/8/95 JC
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* - now makes [0,1], rather than [0,256)
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* - im_grey() now defined in terms of im_fgrey()
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* 2/3/98 JC
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* - partialed
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* 1/2/11
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* - gtk-doc
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* 13/6/13
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* - redo as a class
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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/*
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#define VIPS_DEBUG
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <glib/gi18n-lib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include <vips/vips.h>
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#include "pcreate.h"
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#include "point.h"
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typedef VipsPoint VipsGrey;
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typedef VipsPointClass VipsGreyClass;
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G_DEFINE_TYPE( VipsGrey, vips_grey, VIPS_TYPE_POINT );
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static float
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vips_grey_point( VipsPoint *point, int x, int y )
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{
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return( (double) x / (point->width - 1) );
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}
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static void
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vips_grey_class_init( VipsGreyClass *class )
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{
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VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
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VipsPointClass *point_class = VIPS_POINT_CLASS( class );
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vobject_class->nickname = "grey";
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vobject_class->description = _( "make a grey ramp image" );
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point_class->point = vips_grey_point;
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point_class->min = 0.0;
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point_class->max = 1.0;
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}
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static void
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vips_grey_init( VipsGrey *grey )
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{
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}
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/**
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* vips_grey:
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* @out: (out): output image
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* @width: image size
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* @height: image size
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* @...: %NULL-terminated list of optional named arguments
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*
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* Optional arguments:
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*
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* * @uchar: output a uchar image
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*
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* Create a one-band float image with the left-most column zero and the
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* right-most 1. Intermediate pixels are a linear ramp.
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*
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* Set @uchar to output a uchar image with the leftmost pixel 0 and the
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* rightmost 255.
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*
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* See also: vips_xyz(), vips_identity().
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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vips_grey( VipsImage **out, int width, int height, ... )
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{
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va_list ap;
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int result;
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va_start( ap, height );
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result = vips_call_split( "grey", ap, out, width, height );
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va_end( ap );
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return( result );
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}
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