| /* Turn Lab to LCh |
| * |
| * 2/11/09 |
| * - gtkdoc |
| * - cleanups |
| */ |
| |
| /* |
| |
| This file is part of VIPS. |
| |
| VIPS is free software; you can redistribute it and/or modify |
| it under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| |
| */ |
| |
| /* |
| |
| These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk |
| |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif /*HAVE_CONFIG_H*/ |
| #include <vips/intl.h> |
| |
| #include <stdio.h> |
| #include <math.h> |
| |
| #include <vips/vips.h> |
| |
| #ifdef WITH_DMALLOC |
| #include <dmalloc.h> |
| #endif /*WITH_DMALLOC*/ |
| |
| /* Our main loop. |
| */ |
| void |
| imb_Lab2LCh( float *p, float *q, int n ) |
| { |
| int x; |
| |
| for( x = 0; x < n; x++ ) { |
| float L = p[0]; |
| float a = p[1]; |
| float b = p[2]; |
| float C, h; |
| |
| p += 3; |
| |
| C = sqrt( a * a + b * b ); |
| h = im_col_ab2h( a, b ); |
| |
| q[0] = L; |
| q[1] = C; |
| q[2] = h; |
| |
| q += 3; |
| } |
| } |
| |
| int |
| im__colour_unary( const char *domain, |
| IMAGE *in, IMAGE *out, VipsType type, |
| im_wrapone_fn buffer_fn, void *a, void *b ) |
| { |
| IMAGE *t[1]; |
| |
| if( im_check_uncoded( domain, in ) || |
| im_check_bands( domain, in, 3 ) || |
| im_open_local_array( out, t, 1, domain, "p" ) || |
| im_clip2fmt( in, t[0], IM_BANDFMT_FLOAT ) ) |
| return( -1 ); |
| |
| if( im_cp_desc( out, t[0] ) ) |
| return( -1 ); |
| out->Type = type; |
| |
| if( im_wrapone( t[0], out, |
| (im_wrapone_fn) buffer_fn, a, b ) ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |
| |
| /** |
| * im_Lab2LCh: |
| * @in: input image |
| * @out: output image |
| * |
| * Turn Lab to LCh. |
| * |
| * Returns: 0 on success, -1 on error. |
| */ |
| int |
| im_Lab2LCh( IMAGE *in, IMAGE *out ) |
| { |
| return( im__colour_unary( "im_Lab2LCh", in, out, IM_TYPE_LCH, |
| (im_wrapone_fn) imb_Lab2LCh, NULL, NULL ) ); |
| } |