339 lines
7.3 KiB
C
339 lines
7.3 KiB
C
/* @(#) im_histplot: plot a 1xany or anyx1 image file as a max x any or
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* @(#) any x max graph using these rules:
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* @(#)
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* @(#) - unsigned char
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* @(#) always output 256
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* @(#) - other unsigned integer types
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* @(#) output 0 - max
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* @(#) - signed int types
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* @(#) min moved to 0, max moved to max + min.
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* @(#) - float types
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* @(#) min moved to 0, max moved to any (square output)
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* @(#)
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* @(#) usage:
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* @(#)
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* @(#) int
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* @(#) im_histplot( hist, histplot )
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* @(#) IMAGE *hist, *histplot;
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* @(#)
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* @(#) Returns non-zero on error
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*
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* Copyright: 1990, N. Dessipris.
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*
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* Author: Nicos Dessipris.
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* Written on: 09/07/1990
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* Modified on : 12/03/1991
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* 20/6/95 JC
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* - rules rationalised
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* - im_lineprof removed
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* - rewritten
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* 13/8/99 JC
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* - rewritten again for partial, rules redone
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* 19/9/99 JC
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* - oooops, broken for >1 band
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* 26/9/99 JC
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* - oooops, graph float was wrong
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* 17/11/99 JC
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* - oops, failed for all 0's histogram
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* 14/12/05
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* - redone plot function in C, also use incheck() to cache calcs
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* - much, much faster!
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <vips/vips.h>
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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/* Normalise an image using the rules noted above.
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*/
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static int
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normalise( IMAGE *in, IMAGE *out )
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{
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IMAGE *t1 = im_open_local( out, "im_histplot:2", "p" );
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double min, max;
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if( in->Coding != IM_CODING_NONE ) {
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im_error( "im_histplot", _( "uncoded only" ) );
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return( -1 );
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}
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if( im_iscomplex( in ) ) {
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im_error( "im_histplot", _( "non-complex only" ) );
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return( -1 );
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}
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if( im_isuint( in ) ) {
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/* Trivial case.
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*/
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if( im_copy( in, out ) )
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return( -1 );
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}
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else if( im_isint( in ) ) {
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/* Move min up to 0. incheck(), because we have to min() so we
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* might as well save the calcs.
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*/
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if( !t1 ||
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im_incheck( in ) ||
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im_min( in, &max ) ||
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im_lintra( 1.0, in, -min, t1 ) )
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return( -1 );
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}
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else {
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/* Float image: scale min--max to 0--any. Output square
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* graph.
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*/
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int any;
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if( in->Xsize == 1 )
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any = in->Ysize;
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else
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any = in->Xsize;
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/* incheck(), because we have to min()/max() so we
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* might as well save the calcs.
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*/
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if( !t1 ||
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im_incheck( in ) ||
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im_min( in, &min ) ||
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im_max( in, &max ) ||
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im_lintra( any / (max - min), in,
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-min * any / (max - min), out ) )
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return( -1 );
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}
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return( 0 );
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}
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#define VERT( TYPE ) { \
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TYPE *p1 = (TYPE *) p; \
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\
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for( x = le; x < ri; x++ ) { \
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for( z = 0; z < nb; z++ ) \
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q[z] = p1[z] < x ? 0 : 255; \
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\
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q += nb; \
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} \
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}
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/* Generate function.
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*/
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static int
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make_vert_gen( REGION *or, void *seq, void *a, void *b )
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{
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IMAGE *in = (IMAGE *) a;
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Rect *r = &or->valid;
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int le = r->left;
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int to = r->top;
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int ri = IM_RECT_RIGHT( r );
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int bo = IM_RECT_BOTTOM( r );
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int nb = in->Bands;
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int x, y, z;
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for( y = to; y < bo; y++ ) {
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unsigned char *q = (unsigned char *)
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IM_REGION_ADDR( or, le, y );
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unsigned char *p = (unsigned char *)
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IM_IMAGE_ADDR( in, 0, y );
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switch( in->BandFmt ) {
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case IM_BANDFMT_UCHAR: VERT( unsigned char ); break;
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case IM_BANDFMT_CHAR: VERT( signed char ); break;
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case IM_BANDFMT_USHORT: VERT( unsigned short ); break;
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case IM_BANDFMT_SHORT: VERT( signed short ); break;
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case IM_BANDFMT_UINT: VERT( unsigned int ); break;
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case IM_BANDFMT_INT: VERT( signed int ); break;
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case IM_BANDFMT_FLOAT: VERT( float ); break;
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case IM_BANDFMT_DOUBLE: VERT( double ); break;
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default:
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im_error( "im_histplot", _( "internal error #8255" ) );
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return( -1 );
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}
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}
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return( 0 );
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}
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#define HORZ( TYPE ) { \
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TYPE *p1 = (TYPE *) p; \
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\
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for( y = to; y < bo; y++ ) { \
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for( z = 0; z < nb; z++ ) \
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q[z] = p1[z] < (ht - y) ? 0 : 255; \
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\
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q += lsk; \
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} \
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}
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/* Generate function.
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*/
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static int
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make_horz_gen( REGION *or, void *seq, void *a, void *b )
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{
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IMAGE *in = (IMAGE *) a;
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Rect *r = &or->valid;
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int le = r->left;
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int to = r->top;
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int ri = IM_RECT_RIGHT( r );
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int bo = IM_RECT_BOTTOM( r );
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int nb = in->Bands;
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int lsk = IM_REGION_LSKIP( or );
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int ht = or->im->Ysize;
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int x, y, z;
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for( x = le; x < ri; x++ ) {
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unsigned char *q = (unsigned char *)
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IM_REGION_ADDR( or, x, to );
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unsigned char *p = (unsigned char *)
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IM_IMAGE_ADDR( in, x, 0 );
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switch( in->BandFmt ) {
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case IM_BANDFMT_UCHAR: HORZ( unsigned char ); break;
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case IM_BANDFMT_CHAR: HORZ( signed char ); break;
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case IM_BANDFMT_USHORT: HORZ( unsigned short ); break;
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case IM_BANDFMT_SHORT: HORZ( signed short ); break;
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case IM_BANDFMT_UINT: HORZ( unsigned int ); break;
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case IM_BANDFMT_INT: HORZ( signed int ); break;
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case IM_BANDFMT_FLOAT: HORZ( float ); break;
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case IM_BANDFMT_DOUBLE: HORZ( double ); break;
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default:
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im_error( "im_histplot", _( "internal error #8255" ) );
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return( -1 );
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}
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}
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return( 0 );
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}
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/* Plot image.
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*/
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static int
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plot( IMAGE *in, IMAGE *out )
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{
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IMAGE *t[5];
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double max;
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int tsize;
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int xsize;
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int ysize;
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if( im_incheck( in ) ||
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im_poutcheck( out ) )
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return( -1 );
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/* Find range we will plot.
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*/
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if( im_open_local_array( out, t, 5, "im_histplot", "p" ) ||
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im_max( in, &max ) )
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return( -1 );
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if( max < 0 ) {
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im_errormsg( "im_histplot: internal error #8254" );
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return( -1 );
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}
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if( in->BandFmt == IM_BANDFMT_UCHAR )
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tsize = 256;
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else
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tsize = ceil( max );
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/* Make sure we don't make a zero height image.
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*/
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if( tsize == 0 )
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tsize = 1;
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if( in->Xsize == 1 ) {
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/* Vertical graph.
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*/
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xsize = tsize;
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ysize = in->Ysize;
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}
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else {
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/* Horizontal graph.
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*/
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xsize = in->Xsize;
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ysize = tsize;
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}
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/* Set image.
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*/
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im_initdesc( out, xsize, ysize, in->Bands,
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IM_BBITS_BYTE, IM_BANDFMT_UCHAR,
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IM_CODING_NONE, IM_TYPE_HISTOGRAM, 1.0, 1.0, 0, 0 );
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/* Set hints - ANY is ok with us.
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*/
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if( im_demand_hint( out, IM_ANY, NULL ) )
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return( -1 );
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/* Generate image.
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*/
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if( in->Xsize == 1 ) {
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if( im_generate( out, NULL, make_vert_gen, NULL, in, NULL ) )
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return( -1 );
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}
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else {
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if( im_generate( out, NULL, make_horz_gen, NULL, in, NULL ) )
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return( -1 );
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}
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return( 0 );
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}
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int
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im_histplot( IMAGE *hist, IMAGE *histplot )
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{
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IMAGE *norm = im_open_local( histplot, "im_histplot:1", "p" );
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if( !norm )
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return( -1 );
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if( hist->Xsize != 1 && hist->Ysize != 1 ) {
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im_error( "im_histplot", _( "Xsize or Ysize not 1" ) );
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return( -1 );
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}
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if( normalise( hist, norm ) ||
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plot( norm, histplot ) )
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return( -1 );
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return( 0 );
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}
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