123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
/* LabS2Lab()
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*
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* 12/12/02 JC
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* - adapted from im_LabS2LabQ()
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* 2/11/09
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* - gtkdoc, cleanup
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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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#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 <vips/vips.h>
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#include "pcolour.h"
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typedef VipsColourCode VipsLabS2Lab;
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typedef VipsColourCodeClass VipsLabS2LabClass;
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G_DEFINE_TYPE( VipsLabS2Lab, vips_LabS2Lab, VIPS_TYPE_COLOUR_CODE );
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/* Convert n pels from signed short to Lab.
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*/
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static void
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vips_LabS2Lab_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
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{
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signed short *p = (signed short *) in[0];
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float *q = (float *) out;
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int i;
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for( i = 0; i < width; i++ ) {
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q[0] = p[0] / (32767.0 / 100.0);
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q[1] = p[1] / (32768.0 / 128.0);
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q[2] = p[2] / (32768.0 / 128.0);
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p += 3;
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q += 3;
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}
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}
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static void
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vips_LabS2Lab_class_init( VipsLabS2LabClass *class )
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{
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsColourClass *colour_class = VIPS_COLOUR_CLASS( class );
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object_class->nickname = "LabS2Lab";
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object_class->description = _( "transform signed short Lab to float" );
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colour_class->process_line = vips_LabS2Lab_line;
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}
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static void
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vips_LabS2Lab_init( VipsLabS2Lab *LabS2Lab )
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{
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VipsColour *colour = VIPS_COLOUR( LabS2Lab );
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VipsColourCode *code = VIPS_COLOUR_CODE( LabS2Lab );
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colour->interpretation = VIPS_INTERPRETATION_LAB;
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colour->format = VIPS_FORMAT_FLOAT;
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colour->input_bands = 3;
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colour->bands = 3;
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code->input_coding = VIPS_CODING_NONE;
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code->input_format = VIPS_FORMAT_SHORT;
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}
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/**
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* vips_LabS2Lab: (method)
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* @in: input image
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* @out: (out): output image
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* @...: %NULL-terminated list of optional named arguments
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*
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* Convert a LabS three-band signed short image to a three-band float image.
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*
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* See also: vips_LabS2Lab().
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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_LabS2Lab( VipsImage *in, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "LabS2Lab", ap, in, out );
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va_end( ap );
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return( result );
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}
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