351 lines
8.1 KiB
C
351 lines
8.1 KiB
C
/* draw a histogram
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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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* 12/5/09
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* - fix signed/unsigned warning
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* 24/3/10
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* - gtkdoc
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* - small cleanups
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* - oop, would fail for signed int histograms
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* 19/8/13
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* - wrap as a class, left a rewrite for now
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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 <glib/gi18n-lib.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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#include "phistogram.h"
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typedef struct _VipsHistPlot {
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VipsOperation parent_instance;
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VipsImage *in;
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VipsImage *out;
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} VipsHistPlot;
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typedef VipsOperationClass VipsHistPlotClass;
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G_DEFINE_TYPE( VipsHistPlot, vips_hist_plot, VIPS_TYPE_OPERATION );
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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] < ((TYPE) 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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vips_hist_plot_vert_gen( VipsRegion *or, void *seq, void *a, void *b,
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gboolean *stop )
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{
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VipsImage *in = (VipsImage *) a;
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VipsRect *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 = VIPS_RECT_RIGHT( r );
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int bo = VIPS_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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VipsPel *q = VIPS_REGION_ADDR( or, le, y );
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VipsPel *p = VIPS_IMAGE_ADDR( in, 0, y );
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switch( in->BandFmt ) {
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case VIPS_FORMAT_UCHAR: VERT( unsigned char ); break;
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case VIPS_FORMAT_CHAR: VERT( signed char ); break;
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case VIPS_FORMAT_USHORT: VERT( unsigned short ); break;
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case VIPS_FORMAT_SHORT: VERT( signed short ); break;
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case VIPS_FORMAT_UINT: VERT( unsigned int ); break;
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case VIPS_FORMAT_INT: VERT( signed int ); break;
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case VIPS_FORMAT_FLOAT: VERT( float ); break;
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case VIPS_FORMAT_DOUBLE: VERT( double ); break;
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default:
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g_assert_not_reached();
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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] < ((TYPE) (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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vips_hist_plot_horz_gen( VipsRegion *or, void *seq, void *a, void *b,
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gboolean *stop )
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{
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VipsImage *in = (VipsImage *) a;
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VipsRect *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 = VIPS_RECT_RIGHT( r );
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int bo = VIPS_RECT_BOTTOM( r );
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int nb = in->Bands;
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int lsk = VIPS_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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VipsPel *q = VIPS_REGION_ADDR( or, x, to );
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VipsPel *p = VIPS_IMAGE_ADDR( in, x, 0 );
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switch( in->BandFmt ) {
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case VIPS_FORMAT_UCHAR: HORZ( unsigned char ); break;
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case VIPS_FORMAT_CHAR: HORZ( signed char ); break;
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case VIPS_FORMAT_USHORT: HORZ( unsigned short ); break;
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case VIPS_FORMAT_SHORT: HORZ( signed short ); break;
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case VIPS_FORMAT_UINT: HORZ( unsigned int ); break;
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case VIPS_FORMAT_INT: HORZ( signed int ); break;
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case VIPS_FORMAT_FLOAT: HORZ( float ); break;
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case VIPS_FORMAT_DOUBLE: HORZ( double ); break;
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default:
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g_assert_not_reached();
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}
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}
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return( 0 );
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}
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static int
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vips_hist_plot_build( VipsObject *object )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
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VipsHistPlot *plot = (VipsHistPlot *) object;
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VipsImage **t = (VipsImage **) vips_object_local_array( object, 2 );
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VipsImage *in;
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double min, max;
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int width, height, tsize;
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VipsGenerateFn generate_fn;
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g_object_set( plot, "out", vips_image_new(), NULL );
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if( VIPS_OBJECT_CLASS( vips_hist_plot_parent_class )->build( object ) )
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return( -1 );
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in = plot->in;
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if( vips_check_uncoded( class->nickname, in ) ||
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vips_check_noncomplex( class->nickname, in ) ||
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vips_check_hist( class->nickname, in ) )
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return( -1 );
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if( !vips_band_format_isuint( in->BandFmt ) &&
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vips_band_format_isint( in->BandFmt ) ) {
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/* A signed int type. Move min up to 0.
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*/
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double min;
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if( vips_min( in, &min, NULL ) ||
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vips_linear1( in, &t[0], 1.0, -min, NULL ) )
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return( -1 );
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in = t[0];
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}
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else if( vips_band_format_isfloat( in->BandFmt ) ) {
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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 = in->Xsize * in->Ysize;
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if( vips_stats( in, &t[0], NULL ) )
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return( -1 );
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min = *VIPS_MATRIX( t[0], 0, 0 );
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max = *VIPS_MATRIX( t[0], 1, 0 );
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if( vips_linear1( in, &t[1],
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any / (max - min), -min * any / (max - min), NULL ) )
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return( -1 );
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in = t[1];
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}
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if( vips_image_wio_input( in ) )
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return( -1 );
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/* Find range we will plot.
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*/
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if( vips_max( in, &max, NULL ) )
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return( -1 );
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g_assert( max >= 0 );
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if( in->BandFmt == VIPS_FORMAT_UCHAR )
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tsize = 256;
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else
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tsize = VIPS_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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width = tsize;
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height = in->Ysize;
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generate_fn = vips_hist_plot_vert_gen;
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}
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else {
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/* Horizontal graph.
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*/
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width = in->Xsize;
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height = tsize;
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generate_fn = vips_hist_plot_horz_gen;
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}
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/* Set image.
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*/
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vips_image_init_fields( plot->out, width, height, in->Bands,
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VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
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VIPS_INTERPRETATION_HISTOGRAM,
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1.0, 1.0 );
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if( vips_image_pipelinev( plot->out, VIPS_DEMAND_STYLE_ANY, NULL ) ||
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vips_image_generate( plot->out,
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NULL, generate_fn, NULL, in, NULL ) )
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return( -1 );
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return( 0 );
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}
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static void
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vips_hist_plot_class_init( VipsHistPlotClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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object_class->nickname = "hist_plot";
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object_class->description = _( "plot histogram" );
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object_class->build = vips_hist_plot_build;
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VIPS_ARG_IMAGE( class, "in", 1,
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_( "Input" ),
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_( "Input image" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsHistPlot, in ) );
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VIPS_ARG_IMAGE( class, "out", 2,
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_( "Output" ),
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_( "Output image" ),
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VIPS_ARGUMENT_REQUIRED_OUTPUT,
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G_STRUCT_OFFSET( VipsHistPlot, out ) );
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}
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static void
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vips_hist_plot_init( VipsHistPlot *hist_plot )
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{
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}
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/**
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* vips_hist_plot: (method)
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* @in: input image
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* @out: (out): output image
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* @...: %NULL-terminated list of optional named arguments
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*
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* Plot a 1 by any or any by 1 image file as a max by any or
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* any by max image using these rules:
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*
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* <emphasis>unsigned char</emphasis> max is always 256
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*
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* <emphasis>other unsigned integer types</emphasis> output 0 - maxium
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* value of @in.
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*
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* <emphasis>signed int types</emphasis> min moved to 0, max moved to max + min.
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*
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* <emphasis>float types</emphasis> min moved to 0, max moved to any
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* (square output)
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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vips_hist_plot( VipsImage *in, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "hist_plot", ap, in, out );
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va_end( ap );
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return( result );
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}
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