| /* im_Lab2LabS: quantise FLOAT Lab image into signed short format |
| * |
| * 12/12/02 JC |
| * - from im_Lab2LabQ |
| * 1/11/09 |
| * - 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*/ |
| |
| void |
| imb_Lab2LabS( float *in, signed short *out, int n ) |
| { |
| float *p = in; |
| signed short *q = out; |
| int c; |
| |
| for( c = 0; c < n; c++ ) { |
| q[0] = p[0] * (32767.0 / 100.0); |
| q[1] = p[1] * (32768.0 / 128.0); |
| q[2] = p[2] * (32768.0 / 128.0); |
| |
| q += 3; |
| p += 3; |
| } |
| } |
| |
| /** |
| * im_Lab2LabS: |
| * @in: input image |
| * @out: output image |
| * |
| * Turn Lab to LabS, signed 16-bit int fixed point. |
| * |
| * Returns: 0 on success, -1 on error. |
| */ |
| int |
| im_Lab2LabS( IMAGE *in, IMAGE *out ) |
| { |
| IMAGE *t[1]; |
| |
| if( im_check_uncoded( "im_Lab2LabS", in ) || |
| im_check_bands( "im_Lab2LabS", in, 3 ) || |
| im_open_local_array( out, t, 1, "im_Lab2LabS", "p" ) || |
| im_clip2fmt( in, t[0], IM_BANDFMT_FLOAT ) ) |
| return( -1 ); |
| |
| if( im_cp_desc( out, t[0] ) ) |
| return( -1 ); |
| out->Type = IM_TYPE_LABS; |
| out->BandFmt = IM_BANDFMT_SHORT; |
| |
| if( im_wrapone( t[0], out, |
| (im_wrapone_fn) imb_Lab2LabS, NULL, NULL ) ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |