| /* @(#) Creates a IM_BANDFMT_FLOAT grey level image of a specified size. Range is |
| * @(#) always [0,1]. |
| * @(#) |
| * @(#) Usage: |
| * @(#) |
| * @(#) int |
| * @(#) im_fgrey( image, xsize, ysize ) |
| * @(#) IMAGE *image; |
| * @(#) int xsize, ysize; |
| * @(#) |
| * @(#) Returns 0 on success and -1 on error |
| * @(#) |
| * |
| * Copyright: 1990, N. Dessipris. |
| * |
| * Author: Nicos Dessipris |
| * Written on: 02/02/1990 |
| * Modified on: |
| * 22/7/93 JC |
| * - im_outcheck() added |
| * - externs removed |
| * 8/2/95 JC |
| * - ANSIfied |
| * - im_fgrey() made from im_grey() |
| * 31/8/95 JC |
| * - now makes [0,1], rather than [0,256) |
| * - im_grey() now defined in terms of im_fgrey() |
| * 2/3/98 JC |
| * - partialed |
| */ |
| |
| /* |
| |
| 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*/ |
| |
| /* Generate function. |
| */ |
| static int |
| fgrey_gen( REGION *or, void *seq, void *a, void *b ) |
| { |
| Rect *r = &or->valid; |
| int le = r->left; |
| int to = r->top; |
| int iwm = or->im->Xsize - 1; |
| |
| int x, y; |
| |
| for( y = 0; y < r->height; y++ ) { |
| float *q = (float *) IM_REGION_ADDR( or, le, y + to ); |
| |
| for( x = 0; x < r->width; x++ ) |
| q[x] = (float) (x + le) / iwm; |
| } |
| |
| return( 0 ); |
| } |
| |
| /* Make a one band grey ramp image. |
| */ |
| int |
| im_fgrey( IMAGE *out, const int xsize, const int ysize ) |
| { |
| /* Check args. |
| */ |
| if( xsize <=0 || ysize <= 0 ) { |
| im_error( "im_fgrey", "%s", _( "bad size" ) ); |
| return( -1 ); |
| } |
| if( im_poutcheck( out ) ) |
| return( -1 ); |
| |
| /* Set image. |
| */ |
| im_initdesc( out, xsize, ysize, 1, IM_BBITS_FLOAT, IM_BANDFMT_FLOAT, |
| IM_CODING_NONE, IM_TYPE_B_W, 1.0, 1.0, 0, 0 ); |
| |
| /* Set hints - ANY is ok with us. |
| */ |
| if( im_demand_hint( out, IM_ANY, NULL ) ) |
| return( -1 ); |
| |
| /* Generate image. |
| */ |
| if( im_generate( out, NULL, fgrey_gen, NULL, NULL, NULL ) ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |
| |
| /* As above, but make a IM_BANDFMT_UCHAR [0-255] image. |
| */ |
| int |
| im_grey( IMAGE *image, const int xsize, const int ysize ) |
| { |
| IMAGE *t1 = im_open_local( image, "im_grey:1", "p" ); |
| IMAGE *t2 = im_open_local( image, "im_grey:2", "p" ); |
| |
| if( !t1 || !t2 ) |
| return( -1 ); |
| |
| /* Change range to [0,255]. |
| */ |
| if( im_fgrey( t1, xsize, ysize ) || |
| im_lintra( 255.0, t1, 0.0, t2 ) || |
| im_clip2fmt( t2, image, IM_BANDFMT_UCHAR ) ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |