311 lines
5.8 KiB
C
311 lines
5.8 KiB
C
/* Turn CMC to LCh
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*
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* 15/11/94 JC
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* - error messages added
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* - memory leak fixed
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* 16/11/94 JC
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* - uses im_wrap_oneonebuf() now
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* 2/11/09
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* - gtkdoc
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* 30/11/09
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* - argh, im_col_make_tables_CMC(); missing, thanks Peter
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* 19/9/12
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* - redone 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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#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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/* Arrays for lookup tables for the inverse function.
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*/
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static float LI[1001];
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static float CI[3001];
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static float hI[101][361];
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typedef VipsColourTransform VipsCMC2LCh;
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typedef VipsColourTransformClass VipsCMC2LChClass;
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G_DEFINE_TYPE( VipsCMC2LCh, vips_CMC2LCh, VIPS_TYPE_COLOUR_TRANSFORM );
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/* Generate LI (inverse) tables.
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*/
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static void
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make_LI( void )
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{
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int i;
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float Ll[1001];
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for( i = 0; i < 1001; i++ )
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Ll[i] = vips_col_L2Lcmc( i / 10.0 );
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for( i = 0; i < 1001; i++ ) {
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int j;
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/* Must be 1000, since j will be +1 on exit.
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*/
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for( j = 0; j < 1000 && Ll[j] <= i / 10.0; j++ )
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;
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LI[i] = (j - 1) / 10.0 +
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(i / 10.0 - Ll[j - 1]) / ((Ll[j] - Ll[j - 1]) * 10.0);
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}
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}
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/* Generate Ccmc table.
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*/
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static void
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make_CI( void )
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{
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int i;
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float Cl[3001];
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for( i = 0; i < 3001; i++ )
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Cl[i] = vips_col_C2Ccmc( i / 10.0 );
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for( i = 0; i < 3001; i++ ) {
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int j;
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/* Must be 3000, since j will be +1 on exit.
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*/
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for( j = 0; j < 3000 && Cl[j] <= i / 10.0; j++ )
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;
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CI[i] = (j - 1) / 10.0 +
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(i / 10.0 - Cl[j - 1]) / ((Cl[j] - Cl[j - 1]) * 10.0);
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}
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}
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/* The difficult one: hcmc.
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*/
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static void
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make_hI( void )
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{
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int i, j;
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float hl[101][361];
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for( i = 0; i < 361; i++ )
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for( j = 0; j < 101; j++ )
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hl[j][i] = vips_col_Ch2hcmc( j * 2.0, i );
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for( j = 0; j < 101; j++ ) {
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for( i = 0; i < 361; i++ ) {
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int k;
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for( k = 1; k < 360 && hl[j][k] <= i; k++ )
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;
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hI[j][i] = k - 1 + (i - hl[j][k - 1]) /
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(hl[j][k] - hl[j][k - 1]);
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}
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}
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}
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/**
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* vips_col_Lcmc2L:
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* @Lcmc: L cmc
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*
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* Calculate L from Lcmc using a table. Call vips_col_make_tables_CMC() at
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* least once before using this function.
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*
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* Returns: L*
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*/
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float
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vips_col_Lcmc2L( float Lcmc )
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{
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int known;
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known = VIPS_FLOOR( Lcmc * 10.0 );
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known = VIPS_CLIP( 0, known, 999 );
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return( LI[known] +
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(LI[known + 1] - LI[known]) * (Lcmc * 10.0 - known) );
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}
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/**
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* vips_col_Ccmc2C:
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* @Ccmc: Ccmc
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*
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* Calculate C from Ccmc using a table.
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* Call vips_col_make_tables_CMC() at
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* least once before using this function.
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*
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* Returns: C.
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*/
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float
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vips_col_Ccmc2C( float Ccmc )
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{
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int known;
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known = VIPS_FLOOR( Ccmc * 10.0 );
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known = VIPS_CLIP( 0, known, 2999 );
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return( CI[known] +
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(CI[known + 1] - CI[known]) * (Ccmc * 10.0 - known) );
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}
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/**
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* vips_col_Chcmc2h:
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* @C: Chroma
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* @hcmc: Hue cmc (degrees)
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*
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* Calculate h from C and hcmc, using a table.
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* Call vips_col_make_tables_CMC() at
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* least once before using this function.
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*
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* Returns: h.
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*/
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float
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vips_col_Chcmc2h( float C, float hcmc )
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{
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int r;
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int known;
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/* Which row of the table?
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*/
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r = (int) ((C + 1.0) / 2.0);
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r = VIPS_CLIP( 0, r, 99 );
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known = VIPS_FLOOR( hcmc );
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known = VIPS_CLIP( 0, known, 359 );
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return( hI[r][known] +
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(hI[r][(known + 1) % 360] - hI[r][known]) * (hcmc - known) );
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}
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static void *
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tables_init( void *client )
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{
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make_LI();
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make_CI();
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make_hI();
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return( NULL );
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}
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/**
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* vips_col_make_tables_CMC:
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*
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* Make the lookup tables for cmc.
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*/
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void
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vips_col_make_tables_CMC( void )
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{
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static GOnce once = G_ONCE_INIT;
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VIPS_ONCE( &once, tables_init, NULL );
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}
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/* Process a buffer of data.
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*/
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void
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vips_CMC2LCh_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
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{
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float *p = (float *) in[0];
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float *q = (float *) out;
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int x;
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for( x = 0; x < width; x++ ) {
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float Lcmc = p[0];
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float Ccmc = p[1];
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float hcmc = p[2];
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/* Turn from CMC.
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*/
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float C = vips_col_Ccmc2C( Ccmc );
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float h = vips_col_Chcmc2h( C, hcmc );
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float L = vips_col_Lcmc2L( Lcmc );
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p += 3;
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q[0] = L;
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q[1] = C;
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q[2] = h;
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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_CMC2LCh_class_init( VipsCMC2LChClass *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 = "CMC2LCh";
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object_class->description = _( "transform LCh to CMC" );
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colour_class->process_line = vips_CMC2LCh_line;
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}
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static void
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vips_CMC2LCh_init( VipsCMC2LCh *CMC2LCh )
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{
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VipsColour *colour = VIPS_COLOUR( CMC2LCh );
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vips_col_make_tables_CMC();
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colour->interpretation = VIPS_INTERPRETATION_LCH;
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}
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/**
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* vips_CMC2LCh: (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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* Turn LCh to CMC.
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*
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* See also: vips_LCh2CMC().
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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_CMC2LCh( 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( "CMC2LCh", ap, in, out );
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va_end( ap );
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return( result );
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}
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