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/* clamp pixels to range
*
* 17/6/24
* - from abs.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 "unary.h"
typedef struct _VipsClamp {
VipsUnary parent_instance;
double min;
double max;
} VipsClamp;
typedef VipsUnaryClass VipsClampClass;
G_DEFINE_TYPE(VipsClamp, vips_clamp, VIPS_TYPE_UNARY);
#define CLAMP_LINE(TYPE) \
{ \
TYPE *restrict p = (TYPE *) in[0]; \
TYPE *restrict q = (TYPE *) out; \
\
for (int x = 0; x < sz; x++) \
q[x] = VIPS_CLIP(clamp->min, p[x], clamp->max); \
}
static void
vips_clamp_buffer(VipsArithmetic *arithmetic,
VipsPel *out, VipsPel **in, int width)
{
VipsClamp *clamp = (VipsClamp *) arithmetic;
VipsImage *im = arithmetic->ready[0];
const int bands = vips_image_get_bands(im);
int sz = width * bands * (vips_band_format_iscomplex(im->BandFmt) ? 2 : 1);
switch (vips_image_get_format(im)) {
case VIPS_FORMAT_CHAR:
CLAMP_LINE(signed char);
break;
case VIPS_FORMAT_UCHAR:
CLAMP_LINE(unsigned char);
break;
case VIPS_FORMAT_SHORT:
CLAMP_LINE(signed short);
break;
case VIPS_FORMAT_USHORT:
CLAMP_LINE(unsigned short);
break;
case VIPS_FORMAT_INT:
CLAMP_LINE(signed int);
break;
case VIPS_FORMAT_UINT:
CLAMP_LINE(unsigned int);
break;
case VIPS_FORMAT_FLOAT:
CLAMP_LINE(float);
break;
case VIPS_FORMAT_DOUBLE:
CLAMP_LINE(double);
break;
case VIPS_FORMAT_COMPLEX:
CLAMP_LINE(float);
break;
case VIPS_FORMAT_DPCOMPLEX:
CLAMP_LINE(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
/* Format doesn't change with clamp.
*/
static const VipsBandFormat vips_clamp_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_clamp_class_init(VipsClampClass *class)
{
GObjectClass *gobject_class = (GObjectClass *) class;
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS(class);
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "clamp";
object_class->description = _("clamp values of an image");
aclass->process_line = vips_clamp_buffer;
vips_arithmetic_set_format_table(aclass, vips_clamp_format_table);
VIPS_ARG_DOUBLE(class, "min", 10,
_("Min"),
_("Minimum value"),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET(VipsClamp, min),
-INFINITY, INFINITY, 0.0);
VIPS_ARG_DOUBLE(class, "max", 11,
_("Max"),
_("Maximum value"),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET(VipsClamp, max),
-INFINITY, INFINITY, 0.0);
}
static void
vips_clamp_init(VipsClamp *clamp)
{
clamp->min = 0.0;
clamp->max = 1.0;
}
/**
* vips_clamp: (method)
* @in: input #VipsImage
* @out: (out): output #VipsImage
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @min: %gdouble, minimum value
* * @max: %gdouble, maximum value
*
* This operation clamps pixel values to a range, by default 0 - 1.
*
* Use @min and @max to change the range.
*
* See also: vips_sign(), vips_abs(), vips_sdf().
*
* Returns: 0 on success, -1 on error
*/
int
vips_clamp(VipsImage *in, VipsImage **out, ...)
{
va_list ap;
int result;
va_start(ap, out);
result = vips_call_split("clamp", ap, in, out);
va_end(ap);
return result;
}
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