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/* im_lowpass()
* History:
* 27/10/94 JC
* - IM_ARRAY modified to use local allocation
* - im_iscomplex() call added
* 17/2/95 JC
* - modernised a little
* 18/8/95 JC
* - name changed to reflect function more closely
* 2/6/04
* - was detecting edges incorrectly, segv for some images (thanks Javi)
*/
/*
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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 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 <glib/gi18n-lib.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <vips/vips.h>
/* What we do for each pel.
*/
#define LOOP(TYPE) \
if (Xint >= 0 && Yint >= 0 && \
Xint < in->Xsize - 1 && Yint < in->Ysize - 1) \
for (bb = 0; bb < in->Bands; bb++) { \
TYPE s1 = *((TYPE *) p); \
TYPE s2 = *((TYPE *) (p + ips)); \
TYPE s3 = *((TYPE *) (p + ils)); \
TYPE s4 = *((TYPE *) (p + ips + ils)); \
TYPE *t = (TYPE *) q; \
\
*t = (1 - dx) * (1 - dy) * s1 + dx * (1 - dy) * s2 + \
dy * (1 - dx) * s3 + dx * dy * s4; \
\
p += ies; \
q += oes; \
} \
else if (Xint == in->Xsize - 1 && Yint >= 0 && Yint < in->Ysize - 1) \
for (bb = 0; bb < in->Bands; bb++) { \
TYPE s1 = *((TYPE *) p); \
TYPE s3 = *((TYPE *) (p + ils)); \
TYPE *t = (TYPE *) q; \
\
*t = (1 - dy) * s1 + dy * s3; \
\
p += ies; \
q += oes; \
} \
else if (Yint == in->Ysize - 1 && Xint >= 0 && Xint < in->Xsize - 1) \
for (bb = 0; bb < in->Bands; bb++) { \
TYPE s1 = *((TYPE *) p); \
TYPE s2 = *((TYPE *) (p + ips)); \
TYPE *t = (TYPE *) q; \
\
*t = (1 - dx) * s1 + dx * s2; \
\
p += ies; \
q += oes; \
} \
else \
for (bb = 0; bb < in->Bands; bb++) { \
unsigned char s1 = *((unsigned char *) p); \
TYPE *t = (TYPE *) q; \
\
*t = s1; \
\
p += ies; \
q += oes; \
}
int
im_resize_linear(IMAGE *in, IMAGE *out, int X, int Y)
{
double dx, dy, xscale, yscale;
double Xnew, Ynew; /* inv. coord. of the interpolated pt */
int x, y;
int Xint, Yint;
int bb;
PEL *input, *opline;
PEL *q, *p;
int ils, ips, ies; /* Input and output line, pel and */
int ols, oes; /* element sizes */
if (im_iocheck(in, out))
return -1;
if (vips_band_format_iscomplex(in->BandFmt)) {
im_error("im_lowpass", "%s", _("non-complex input only"));
return -1;
}
if (in->Coding != IM_CODING_NONE) {
im_error("im_lowpass: ", "%s", _("put should be uncoded"));
return -1;
}
if (im_cp_desc(out, in))
return -1;
out->Xsize = X;
out->Ysize = Y;
if (im_setupout(out))
return -1;
ils = IM_IMAGE_SIZEOF_LINE(in);
ips = IM_IMAGE_SIZEOF_PEL(in);
ies = IM_IMAGE_SIZEOF_ELEMENT(in);
ols = IM_IMAGE_SIZEOF_LINE(out);
oes = IM_IMAGE_SIZEOF_ELEMENT(out);
/* buffer lines
***************/
if (!(opline = IM_ARRAY(out, ols, PEL)))
return -1;
/* Resampling
*************/
input = (PEL *) in->data;
xscale = ((double) in->Xsize - 1) / (X - 1);
yscale = ((double) in->Ysize - 1) / (Y - 1);
for (y = 0; y < Y; y++) {
q = opline;
for (x = 0; x < X; x++) {
Xnew = x * xscale;
Ynew = y * yscale;
Xint = floor(Xnew);
Yint = floor(Ynew);
dx = Xnew - Xint;
dy = Ynew - Yint;
p = input + Xint * ips + Yint * ils;
switch (in->BandFmt) {
case IM_BANDFMT_UCHAR:
LOOP(unsigned char);
break;
case IM_BANDFMT_USHORT:
LOOP(unsigned short);
break;
case IM_BANDFMT_UINT:
LOOP(unsigned int);
break;
case IM_BANDFMT_CHAR:
LOOP(signed char);
break;
case IM_BANDFMT_SHORT:
LOOP(signed short);
break;
case IM_BANDFMT_INT:
LOOP(signed int);
break;
case IM_BANDFMT_FLOAT:
LOOP(float);
break;
case IM_BANDFMT_DOUBLE:
LOOP(double);
break;
default:
im_error("im_lowpass", "%s", _("unsupported image type"));
return -1;
/*NOTREACHED*/
}
}
if (im_writeline(y, out, opline))
return -1;
}
return 0;
}
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