| /* identity LUTs |
| * |
| * Copyright 1991, N. Dessipris. |
| * |
| * Author N. Dessipris |
| * Written on 11/03/1991 |
| * Updated on: |
| * 18/6/93 JC |
| * - im_outcheck() call added |
| * - ANSIfied |
| * 24/8/94 JC |
| * - im_identity_ushort() added |
| * 24/3/10 |
| * - gtkdoc |
| */ |
| |
| /* |
| |
| 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 <stdlib.h> |
| #include <math.h> |
| |
| #include <vips/vips.h> |
| |
| #ifdef WITH_DMALLOC |
| #include <dmalloc.h> |
| #endif /*WITH_DMALLOC*/ |
| |
| /** |
| * im_identity: |
| * @lut: output image |
| * @bands: number of bands to create |
| * |
| * Creates a image file with Xsize=256, Ysize=1, Bands=@bands, |
| * BandFmt=IM_BANDFMT_UCHAR, Type=IM_TYPE_HISTOGRAM. |
| * |
| * The created image consist a @bands-bands linear lut and is the basis |
| * for building up look-up tables. |
| * |
| * See also: im_identity_ushort(). |
| * |
| * Returns: 0 on success, -1 on error |
| */ |
| int |
| im_identity( IMAGE *lut, int bands ) |
| { |
| unsigned char *buf, *p; |
| int x, z; |
| |
| /* Check input args |
| */ |
| if( im_outcheck( lut ) ) |
| return( -1 ); |
| if( bands < 0 ) { |
| im_error( "im_identity", "%s", _( "bad bands" ) ); |
| return( -1 ); |
| } |
| |
| /* Set new image properly. |
| */ |
| im_initdesc( lut, |
| 256, 1, bands, IM_BBITS_BYTE, IM_BANDFMT_UCHAR, |
| IM_CODING_NONE, IM_TYPE_HISTOGRAM, 1.0, 1.0, 0, 0 ); |
| |
| /* Make output. |
| */ |
| if( im_setupout( lut ) ) |
| return( -1 ); |
| |
| /* Create output buffer. |
| */ |
| if( !(buf = (unsigned char *) im_malloc( lut, bands * 256 )) ) |
| return( -1 ); |
| |
| /* Write ramp. |
| */ |
| for( p = buf, x = 0; x < 256; x++ ) |
| for( z = 0; z < bands; z++ ) |
| *p++ = x; |
| |
| if( im_writeline( 0, lut, buf ) ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |
| |
| /** |
| * im_identity_ushort: |
| * @lut: output image |
| * @bands: number of bands to create |
| * @sz: size of LUT to create |
| * |
| * As im_identity(), but make a ushort LUT. ushort LUTs can be up to 65536 |
| * elements - @sz is the number of elements required. |
| * |
| * The created image consist a @bands-bands linear lut and is the basis |
| * for building up look-up tables. |
| * |
| * See also: im_identity(). |
| * |
| * Returns: 0 on success, -1 on error |
| */ |
| int |
| im_identity_ushort( IMAGE *lut, int bands, int sz ) |
| { |
| unsigned short *buf, *p; |
| int x, z; |
| |
| /* Check input args |
| */ |
| if( im_outcheck( lut ) ) |
| return( -1 ); |
| if( sz > 65536 || sz < 0 ) { |
| im_error( "im_identity_ushort", "%s", _( "bad size" ) ); |
| return( -1 ); |
| } |
| if( bands < 0 ) { |
| im_error( "im_identity_ushort", "%s", _( "bad bands" ) ); |
| return( -1 ); |
| } |
| |
| /* Set new image. |
| */ |
| im_initdesc( lut, |
| sz, 1, bands, IM_BBITS_SHORT, IM_BANDFMT_USHORT, |
| IM_CODING_NONE, IM_TYPE_HISTOGRAM, 1.0, 1.0, 0, 0 ); |
| |
| /* Make output. |
| */ |
| if( im_setupout( lut ) ) |
| return( -1 ); |
| |
| /* Create output buffer. |
| */ |
| if( !(buf = (unsigned short *) |
| im_malloc( lut, sz * bands * sizeof( unsigned short ) )) ) |
| return( -1 ); |
| |
| /* Write ramp. |
| */ |
| for( p = buf, x = 0; x < sz; x++ ) |
| for( z = 0; z < bands; z++ ) |
| *p++ = x; |
| if( im_writeline( 0, lut, (PEL *) buf ) ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |