246 lines
7.3 KiB
C
246 lines
7.3 KiB
C
/* Convert float to Radiance 32bit packed format
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*
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* 23/3/09
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* - from im_rad2float and Radiance sources
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* 2/11/09
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* - gtkdoc
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* 20/9/12
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* - redo as a class
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* 13/12/12
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* - tag as scRGB rather than XYZ
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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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Sections of this file from Greg Ward and Radiance with kind
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permission. The Radience copyright notice appears below.
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*/
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/* ====================================================================
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* The Radiance Software License, Version 1.0
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*
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* Copyright (c) 1990 - 2009 The Regents of the University of California,
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* through Lawrence Berkeley National Laboratory. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes Radiance software
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* (http://radsite.lbl.gov/)
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* developed by the Lawrence Berkeley National Laboratory
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* (http://www.lbl.gov/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
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* and "The Regents of the University of California" must
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* not be used to endorse or promote products derived from this
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* software without prior written permission. For written
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* permission, please contact radiance@radsite.lbl.gov.
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*
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* 5. Products derived from this software may not be called "Radiance",
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* nor may "Radiance" appear in their name, without prior written
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* permission of Lawrence Berkeley National Laboratory.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more
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* information on Lawrence Berkeley National Laboratory, please see
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* <http://www.lbl.gov/>.
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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 <math.h>
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#include <vips/vips.h>
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#include "pcolour.h"
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/* Begin copy-paste from Radiance sources.
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*/
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#define RED 0
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#define GRN 1
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#define BLU 2
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#define CIEX 0 /* or, if input is XYZ... */
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#define CIEY 1
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#define CIEZ 2
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#define EXP 3 /* exponent same for either format */
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#define COLXS 128 /* excess used for exponent */
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#define WHT 3 /* used for RGBPRIMS type */
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#undef BYTE
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#define BYTE unsigned char /* 8-bit unsigned integer */
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typedef BYTE COLR[4]; /* red, green, blue (or X,Y,Z), exponent */
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typedef float COLORV;
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typedef COLORV COLOR[3]; /* red, green, blue (or X,Y,Z) */
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#define copycolor(c1,c2) ((c1)[0]=(c2)[0],(c1)[1]=(c2)[1],(c1)[2]=(c2)[2])
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static void
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setcolr( COLR clr, double r, double g, double b ) /* assign a short color value */
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{
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double d;
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int e;
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d = r > g ? r : g;
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if (b > d) d = b;
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if (d <= 1e-32) {
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clr[RED] = clr[GRN] = clr[BLU] = 0;
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clr[EXP] = 0;
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return;
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}
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d = frexp(d, &e) * 255.9999 / d;
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if (r > 0.0)
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clr[RED] = r * d;
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else
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clr[RED] = 0;
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if (g > 0.0)
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clr[GRN] = g * d;
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else
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clr[GRN] = 0;
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if (b > 0.0)
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clr[BLU] = b * d;
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else
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clr[BLU] = 0;
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clr[EXP] = e + COLXS;
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}
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/* End copy-paste from Radiance sources.
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*/
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typedef VipsColourCode VipsFloat2rad;
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typedef VipsColourCodeClass VipsFloat2radClass;
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G_DEFINE_TYPE( VipsFloat2rad, vips_float2rad, VIPS_TYPE_COLOUR_CODE );
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static void
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vips_float2rad_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
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{
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COLOR *inp = (COLOR *) in[0];
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COLR *outbuf = (COLR *) out;
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while( width-- > 0 ) {
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setcolr( outbuf[0], inp[0][RED], inp[0][GRN], inp[0][BLU] );
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inp++;
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outbuf++;
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}
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}
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static void
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vips_float2rad_class_init( VipsFloat2radClass *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 = "float2rad";
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object_class->description =
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_( "transform float RGB to Radiance coding" );
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colour_class->process_line = vips_float2rad_line;
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}
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static void
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vips_float2rad_init( VipsFloat2rad *float2rad )
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{
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VipsColour *colour = VIPS_COLOUR( float2rad );
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VipsColourCode *code = VIPS_COLOUR_CODE( float2rad );
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colour->coding = VIPS_CODING_RAD;
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colour->interpretation = VIPS_INTERPRETATION_scRGB;
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colour->format = VIPS_FORMAT_UCHAR;
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colour->input_bands = 3;
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colour->bands = 4;
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code->input_coding = VIPS_CODING_NONE;
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code->input_format = VIPS_FORMAT_FLOAT;
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}
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/**
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* vips_float2rad: (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 three-band float image to Radiance 32-bit packed format.
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*
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* See also: vips_rad2float(), #VIPS_CODING_RAD, vips_LabQ2Lab().
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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_float2rad( 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( "float2rad", ap, in, out );
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va_end( ap );
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return( result );
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}
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