| /* draw a histogram |
| * |
| * 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! |
| * 12/5/09 |
| * - fix signed/unsigned warning |
| * 24/3/10 |
| * - gtkdoc |
| * - small cleanups |
| * - oop, would fail for signed int histograms |
| */ |
| |
| /* |
| |
| 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 ) |
| { |
| if( im_check_uncoded( "im_histplot", in ) || |
| im_check_noncomplex( "im_histplot", in ) ) |
| return( -1 ); |
| |
| if( vips_bandfmt_isuint( in->BandFmt ) ) { |
| if( im_copy( in, out ) ) |
| return( -1 ); |
| } |
| else if( vips_bandfmt_isint( in->BandFmt ) ) { |
| IMAGE *t1; |
| double min; |
| |
| /* Move min up to 0. |
| */ |
| if( !(t1 = im_open_local( out, "im_histplot", "p" )) || |
| im_min( in, &min ) || |
| im_lintra( 1.0, in, -min, t1 ) ) |
| return( -1 ); |
| } |
| else { |
| /* Float image: scale min--max to 0--any. Output square |
| * graph. |
| */ |
| IMAGE *t1; |
| DOUBLEMASK *stats; |
| double min, max; |
| int any; |
| |
| if( in->Xsize == 1 ) |
| any = in->Ysize; |
| else |
| any = in->Xsize; |
| |
| if( !(stats = im_stats( in )) ) |
| return( -1 ); |
| min = stats->coeff[0]; |
| max = stats->coeff[1]; |
| im_free_dmask( stats ); |
| |
| if( !(t1 = im_open_local( out, "im_histplot", "p" )) || |
| 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] < ((TYPE) 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++ ) { |
| PEL *q = (PEL *) IM_REGION_ADDR( or, le, y ); |
| PEL *p = (PEL *) 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: |
| g_assert( 0 ); |
| } |
| } |
| |
| 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] < ((TYPE) (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++ ) { |
| PEL *q = (PEL *) IM_REGION_ADDR( or, x, to ); |
| PEL *p = (PEL *) 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: |
| g_assert( 0 ); |
| } |
| } |
| |
| return( 0 ); |
| } |
| |
| /* Plot image. |
| */ |
| static int |
| plot( IMAGE *in, IMAGE *out ) |
| { |
| double max; |
| int tsize; |
| int xsize; |
| int ysize; |
| |
| if( im_incheck( in ) || |
| im_poutcheck( out ) ) |
| return( -1 ); |
| |
| /* Find range we will plot. |
| */ |
| if( im_max( in, &max ) ) |
| return( -1 ); |
| g_assert( max >= 0 ); |
| 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 ); |
| } |
| |
| /** |
| * im_histplot: |
| * @in: input image |
| * @out: output image |
| * |
| * Plot a 1 by any or any by 1 image file as a max by any or |
| * any by max image using these rules: |
| * |
| * <emphasis>unsigned char</emphasis> max is always 256 |
| * |
| * <emphasis>other unsigned integer types</emphasis> output 0 - maxium |
| * value of @in. |
| * |
| * <emphasis>signed int types</emphasis> min moved to 0, max moved to max + min. |
| * |
| * <emphasis>float types</emphasis> min moved to 0, max moved to any |
| * (square output) |
| * |
| * See also: im_hist_indexed(), im_histeq(). |
| * |
| * Returns: 0 on success, -1 on error |
| */ |
| int |
| im_histplot( IMAGE *hist, IMAGE *histplot ) |
| { |
| IMAGE *t1; |
| |
| if( im_check_hist( "im_histplot", hist ) ) |
| return( -1 ); |
| |
| if( !(t1 = im_open_local( histplot, "im_histplot:1", "p" )) || |
| normalise( hist, t1 ) || |
| plot( t1, histplot ) ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |