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/* min of a pair of images
*
* 18/6/24
* - from maxpair.c
*/
/*
Copyright (C) 1991-2005 The National Gallery
This library 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 2.1 of the License, or (at your option) any later version.
This library 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 library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/*
#define DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <vips/vips.h>
#include "binary.h"
typedef VipsBinary VipsMinpair;
typedef VipsBinaryClass VipsMinpairClass;
G_DEFINE_TYPE(VipsMinpair, vips_minpair, VIPS_TYPE_BINARY);
#define LOOP(TYPE) \
{ \
TYPE *restrict left = (TYPE *) in[0]; \
TYPE *restrict right = (TYPE *) in[1]; \
TYPE *restrict q = (TYPE *) out; \
\
for (int x = 0; x < sz; x++) \
q[x] = VIPS_MIN(left[x], right[x]); \
}
#define FLOOP(TYPE) \
{ \
TYPE *restrict left = (TYPE *) in[0]; \
TYPE *restrict right = (TYPE *) in[1]; \
TYPE *restrict q = (TYPE *) out; \
\
for (int x = 0; x < sz; x++) \
q[x] = VIPS_FMIN(left[x], right[x]); \
}
static void
minpair_buffer(VipsArithmetic *arithmetic,
VipsPel *out, VipsPel **in, int width)
{
VipsImage *im = arithmetic->ready[0];
int bands = vips_image_get_bands(im);
VipsBandFormat format = vips_image_get_format(im);
int sz = width * bands * (vips_band_format_iscomplex(format) ? 2 : 1);
/* Minpair all input types. Keep types here in sync with
* vips_minpair_format_table[] below.
*/
switch (vips_image_get_format(im)) {
case VIPS_FORMAT_UCHAR:
LOOP(unsigned char);
break;
case VIPS_FORMAT_CHAR:
LOOP(signed char);
break;
case VIPS_FORMAT_USHORT:
LOOP(unsigned short);
break;
case VIPS_FORMAT_SHORT:
LOOP(signed short);
break;
case VIPS_FORMAT_UINT:
LOOP(unsigned int);
break;
case VIPS_FORMAT_INT:
LOOP(signed int);
break;
case VIPS_FORMAT_FLOAT:
case VIPS_FORMAT_COMPLEX:
FLOOP(float);
break;
case VIPS_FORMAT_DOUBLE:
case VIPS_FORMAT_DPCOMPLEX:
FLOOP(double);
break;
default:
g_assert_not_reached();
}
}
#define UC VIPS_FORMAT_UCHAR
#define C VIPS_FORMAT_CHAR
#define US VIPS_FORMAT_USHORT
#define S VIPS_FORMAT_SHORT
#define UI VIPS_FORMAT_UINT
#define I VIPS_FORMAT_INT
#define F VIPS_FORMAT_FLOAT
#define X VIPS_FORMAT_COMPLEX
#define D VIPS_FORMAT_DOUBLE
#define DX VIPS_FORMAT_DPCOMPLEX
static const VipsBandFormat vips_minpair_format_table[10] = {
/* Band format: UC C US S UI I F X D DX */
/* Promotion: */ UC, C, US, S, UI, I, F, X, D, DX
};
static void
vips_minpair_class_init(VipsMinpairClass *class)
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS(class);
object_class->nickname = "minpair";
object_class->description = _("minimum of a pair of images");
aclass->process_line = minpair_buffer;
vips_arithmetic_set_format_table(aclass, vips_minpair_format_table);
}
static void
vips_minpair_init(VipsMinpair *minpair)
{
}
/**
* vips_minpair:
* @left: input image
* @right: input image
* @out: (out): output image
* @...: %NULL-terminated list of optional named arguments
*
* For each pixel, pick the minimum of a pair of images.
*
* See also: vips_minpair().
*
* Returns: 0 on success, -1 on error
*/
int
vips_minpair(VipsImage *left, VipsImage *right, VipsImage **out, ...)
{
va_list ap;
int result;
va_start(ap, out);
result = vips_call_split("minpair", ap, left, right, out);
va_end(ap);
return result;
}
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