| /* @(#) creates a pattern showing the similtaneous constrast effect |
| * @(#) |
| * @(#) Usage: int im_simcontr(image, xs, ys) |
| * @(#) IMAGE *image; |
| * @(#) int xs, ys; |
| * @(#) |
| * @(#) Returns 0 on success and -1 on error |
| * @(#) |
| * |
| * Copyright: 1990, N. Dessipris. |
| * |
| * Author: Nicos Dessipris |
| * Written on: 19/07/1991 |
| * Modified on: |
| * 22/7/93 JC |
| * - externs removed |
| * - im_outcheck() added |
| */ |
| |
| /* |
| |
| 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*/ |
| |
| int |
| im_simcontr( IMAGE *image, int xs, int ys ) |
| { |
| int x, y; |
| unsigned char *line1, *line2, *cpline; |
| |
| |
| /* Check input args */ |
| if( im_outcheck( image ) ) |
| return( -1 ); |
| |
| /* Set now image properly */ |
| im_initdesc(image, xs, ys, 1, IM_BBITS_BYTE, IM_BANDFMT_UCHAR, |
| IM_CODING_NONE, IM_TYPE_B_W, 1.0, 1.0, 0, 0 ); |
| |
| /* Set up image checking whether the output is a buffer or a file */ |
| if (im_setupout( image ) == -1 ) |
| return( -1 ); |
| /* Create data */ |
| line1 = (unsigned char *)calloc((unsigned)xs, sizeof(char)); |
| line2 = (unsigned char *)calloc((unsigned)xs, sizeof(char)); |
| if ( (line1 == NULL) || (line2 == NULL) ) { |
| im_error( "im_simcontr", "%s", _( "calloc failed") ); |
| return(-1); } |
| |
| cpline = line1; |
| for (x=0; x<xs; x++) |
| *cpline++ = (PEL)255; |
| cpline = line1; |
| for (x=0; x<xs/2; x++) |
| *cpline++ = (PEL)0; |
| |
| cpline = line2; |
| for (x=0; x<xs; x++) |
| *cpline++ = (PEL)255; |
| cpline = line2; |
| for (x=0; x<xs/8; x++) |
| *cpline++ = (PEL)0; |
| for (x=0; x<xs/4; x++) |
| *cpline++ = (PEL)128; |
| for (x=0; x<xs/8; x++) |
| *cpline++ = (PEL)0; |
| for (x=0; x<xs/8; x++) |
| *cpline++ = (PEL)255; |
| for (x=0; x<xs/4; x++) |
| *cpline++ = (PEL)128; |
| |
| for (y=0; y<ys/4; y++) |
| { |
| if ( im_writeline( y, image, (PEL *)line1 ) == -1 ) |
| { |
| free ( (char *)line1 ); free ( (char *)line2 ); |
| return( -1 ); |
| } |
| } |
| for (y=ys/4; y<(ys/4+ys/2); y++) |
| { |
| if ( im_writeline( y, image, (PEL *)line2 ) == -1 ) |
| { |
| free ( (char *)line1 ); free ( (char *)line2 ); |
| return( -1 ); |
| } |
| } |
| for (y=(ys/4 + ys/2); y<ys; y++) |
| { |
| if ( im_writeline( y, image, (PEL *)line1 ) == -1 ) |
| { |
| free ( (char *)line1 ); free ( (char *)line2 ); |
| return( -1 ); |
| } |
| } |
| free ( (char *)line1 ); free ( (char *)line2 ); |
| return(0); |
| } |