| /* @(#) square zone plate of size |
| * @(#) The center of the zone plate is at (xpos/2, ypos/2) |
| * @(#) |
| * @(#) Usage: |
| * @(#) |
| * @(#) int im_zone( image, size ) |
| * @(#) IMAGE *image; |
| * @(#) int size; |
| * @(#) |
| * @(#) int im_fzone( image, size ) |
| * @(#) IMAGE *image; |
| * @(#) int size; |
| * @(#) |
| * @(#) Returns 0 on sucess and -1 on error |
| * @(#) |
| * N. Dessipris 01/02/1991 |
| * |
| * 22/7/93 JC |
| * - externs removed |
| * - im_outcheck() added |
| * 30/8/95 JC |
| * - modernized |
| * - memory leaks fixed |
| * - split into im_zone() and im_fzone() |
| */ |
| |
| /* |
| |
| 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_fzone( IMAGE *image, int size ) |
| { |
| int x, y; |
| int i, j; |
| |
| float *buf; |
| const int size2 = size/2; |
| |
| /* Check args. |
| */ |
| if( im_outcheck( image ) ) |
| return( -1 ); |
| if( size <= 0 || (size % 2) != 0 ) { |
| im_error( "im_zone", "%s", |
| _( "size must be even and positive" ) ); |
| return( -1 ); |
| } |
| |
| /* Set up output image. |
| */ |
| im_initdesc( image, size, size, 1, IM_BBITS_FLOAT, IM_BANDFMT_FLOAT, |
| IM_CODING_NONE, IM_TYPE_B_W, 1.0, 1.0, 0, 0 ); |
| if( im_setupout( image ) ) |
| return( -1 ); |
| |
| /* Create output buffer. |
| */ |
| if( !(buf = IM_ARRAY( image, size, float )) ) |
| return( -1 ); |
| |
| /* Make zone plate. |
| */ |
| for( y = 0, j = -size2; j < size2; j++, y++ ) { |
| for( x = 0, i = -size2; i < size2; i++, x++ ) |
| buf[x] = cos( (IM_PI / size) * (i * i + j * j) ); |
| if( im_writeline( y, image, (PEL *) buf ) ) |
| return( -1 ); |
| } |
| |
| return( 0 ); |
| } |
| |
| /* As above, but make a IM_BANDFMT_UCHAR image. |
| */ |
| int |
| im_zone( IMAGE *im, int size ) |
| { |
| IMAGE *t1 = im_open_local( im, "im_zone:1", "p" ); |
| IMAGE *t2 = im_open_local( im, "im_zone:2", "p" ); |
| |
| if( !t1 || !t2 ) |
| return( -1 ); |
| |
| if( im_fzone( t1, size ) || |
| im_lintra( 127.5, t1, 127.5, t2 ) || |
| im_clip2fmt( t2, im, IM_BANDFMT_UCHAR ) ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |