libvips/libsrc/histograms_lut/im_histplot.c

341 lines
7.3 KiB
C

/* @(#) im_histplot: plot a 1xany or anyx1 image file as a max x any or
* @(#) any x max graph using these rules:
* @(#)
* @(#) - unsigned char
* @(#) always output 256
* @(#) - other unsigned integer types
* @(#) output 0 - max
* @(#) - signed int types
* @(#) min moved to 0, max moved to max + min.
* @(#) - float types
* @(#) min moved to 0, max moved to any (square output)
* @(#)
* @(#) usage:
* @(#)
* @(#) int
* @(#) im_histplot( hist, histplot )
* @(#) IMAGE *hist, *histplot;
* @(#)
* @(#) Returns non-zero on error
*
* Copyright: 1990, N. Dessipris.
*
* Author: Nicos Dessipris.
* Written on: 09/07/1990
* Modified on : 12/03/1991
* 20/6/95 JC
* - rules rationalised
* - im_lineprof removed
* - rewritten
* 13/8/99 JC
* - rewritten again for partial, rules redone
* 19/9/99 JC
* - oooops, broken for >1 band
* 26/9/99 JC
* - oooops, graph float was wrong
* 17/11/99 JC
* - oops, failed for all 0's histogram
* 14/12/05
* - redone plot function in C, also use incheck() to cache calcs
* - much, much faster!
*/
/*
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*/
/* Normalise an image using the rules noted above.
*/
static int
normalise( IMAGE *in, IMAGE *out )
{
IMAGE *t1 = im_open_local( out, "im_histplot:2", "p" );
double min, max;
if( in->Coding != IM_CODING_NONE ) {
im_error( "im_histplot", "%s", _( "uncoded only" ) );
return( -1 );
}
if( im_iscomplex( in ) ) {
im_error( "im_histplot", "%s", _( "non-complex only" ) );
return( -1 );
}
if( im_isuint( in ) ) {
/* Trivial case.
*/
if( im_copy( in, out ) )
return( -1 );
}
else if( im_isint( in ) ) {
/* Move min up to 0. incheck(), because we have to min() so we
* might as well save the calcs.
*/
if( !t1 ||
im_incheck( in ) ||
im_min( in, &max ) ||
im_lintra( 1.0, in, -min, t1 ) )
return( -1 );
}
else {
/* Float image: scale min--max to 0--any. Output square
* graph.
*/
int any;
if( in->Xsize == 1 )
any = in->Ysize;
else
any = in->Xsize;
/* incheck(), because we have to min()/max() so we
* might as well save the calcs.
*/
if( !t1 ||
im_incheck( in ) ||
im_min( in, &min ) ||
im_max( in, &max ) ||
im_lintra( any / (max - min), in,
-min * any / (max - min), out ) )
return( -1 );
}
return( 0 );
}
#define VERT( TYPE ) { \
TYPE *p1 = (TYPE *) p; \
\
for( x = le; x < ri; x++ ) { \
for( z = 0; z < nb; z++ ) \
q[z] = p1[z] < x ? 0 : 255; \
\
q += nb; \
} \
}
/* Generate function.
*/
static int
make_vert_gen( REGION *or, void *seq, void *a, void *b )
{
IMAGE *in = (IMAGE *) a;
Rect *r = &or->valid;
int le = r->left;
int to = r->top;
int ri = IM_RECT_RIGHT( r );
int bo = IM_RECT_BOTTOM( r );
int nb = in->Bands;
int x, y, z;
for( y = to; y < bo; y++ ) {
unsigned char *q = (unsigned char *)
IM_REGION_ADDR( or, le, y );
unsigned char *p = (unsigned char *)
IM_IMAGE_ADDR( in, 0, y );
switch( in->BandFmt ) {
case IM_BANDFMT_UCHAR: VERT( unsigned char ); break;
case IM_BANDFMT_CHAR: VERT( signed char ); break;
case IM_BANDFMT_USHORT: VERT( unsigned short ); break;
case IM_BANDFMT_SHORT: VERT( signed short ); break;
case IM_BANDFMT_UINT: VERT( unsigned int ); break;
case IM_BANDFMT_INT: VERT( signed int ); break;
case IM_BANDFMT_FLOAT: VERT( float ); break;
case IM_BANDFMT_DOUBLE: VERT( double ); break;
default:
im_error( "im_histplot",
"%s", _( "internal error #8255" ) );
return( -1 );
}
}
return( 0 );
}
#define HORZ( TYPE ) { \
TYPE *p1 = (TYPE *) p; \
\
for( y = to; y < bo; y++ ) { \
for( z = 0; z < nb; z++ ) \
q[z] = p1[z] < (ht - y) ? 0 : 255; \
\
q += lsk; \
} \
}
/* Generate function.
*/
static int
make_horz_gen( REGION *or, void *seq, void *a, void *b )
{
IMAGE *in = (IMAGE *) a;
Rect *r = &or->valid;
int le = r->left;
int to = r->top;
int ri = IM_RECT_RIGHT( r );
int bo = IM_RECT_BOTTOM( r );
int nb = in->Bands;
int lsk = IM_REGION_LSKIP( or );
int ht = or->im->Ysize;
int x, y, z;
for( x = le; x < ri; x++ ) {
unsigned char *q = (unsigned char *)
IM_REGION_ADDR( or, x, to );
unsigned char *p = (unsigned char *)
IM_IMAGE_ADDR( in, x, 0 );
switch( in->BandFmt ) {
case IM_BANDFMT_UCHAR: HORZ( unsigned char ); break;
case IM_BANDFMT_CHAR: HORZ( signed char ); break;
case IM_BANDFMT_USHORT: HORZ( unsigned short ); break;
case IM_BANDFMT_SHORT: HORZ( signed short ); break;
case IM_BANDFMT_UINT: HORZ( unsigned int ); break;
case IM_BANDFMT_INT: HORZ( signed int ); break;
case IM_BANDFMT_FLOAT: HORZ( float ); break;
case IM_BANDFMT_DOUBLE: HORZ( double ); break;
default:
im_error( "im_histplot",
"%s", _( "internal error #8255" ) );
return( -1 );
}
}
return( 0 );
}
/* Plot image.
*/
static int
plot( IMAGE *in, IMAGE *out )
{
IMAGE *t[5];
double max;
int tsize;
int xsize;
int ysize;
if( im_incheck( in ) ||
im_poutcheck( out ) )
return( -1 );
/* Find range we will plot.
*/
if( im_open_local_array( out, t, 5, "im_histplot", "p" ) ||
im_max( in, &max ) )
return( -1 );
if( max < 0 ) {
im_error( "im_histplot", "%s", _( "internal error #8254" ) );
return( -1 );
}
if( in->BandFmt == IM_BANDFMT_UCHAR )
tsize = 256;
else
tsize = ceil( max );
/* Make sure we don't make a zero height image.
*/
if( tsize == 0 )
tsize = 1;
if( in->Xsize == 1 ) {
/* Vertical graph.
*/
xsize = tsize;
ysize = in->Ysize;
}
else {
/* Horizontal graph.
*/
xsize = in->Xsize;
ysize = tsize;
}
/* Set image.
*/
im_initdesc( out, xsize, ysize, in->Bands,
IM_BBITS_BYTE, IM_BANDFMT_UCHAR,
IM_CODING_NONE, IM_TYPE_HISTOGRAM, 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( in->Xsize == 1 ) {
if( im_generate( out, NULL, make_vert_gen, NULL, in, NULL ) )
return( -1 );
}
else {
if( im_generate( out, NULL, make_horz_gen, NULL, in, NULL ) )
return( -1 );
}
return( 0 );
}
int
im_histplot( IMAGE *hist, IMAGE *histplot )
{
IMAGE *norm = im_open_local( histplot, "im_histplot:1", "p" );
if( !norm )
return( -1 );
if( hist->Xsize != 1 && hist->Ysize != 1 ) {
im_error( "im_histplot", "%s", _( "Xsize or Ysize not 1" ) );
return( -1 );
}
if( normalise( hist, norm ) ||
plot( norm, histplot ) )
return( -1 );
return( 0 );
}