gimp/plug-ins/gimpressionist/ppmtool.c

905 lines
19 KiB
C

/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <glib/gstdio.h>
#include <libgimp/gimp.h>
#include <libgimpmath/gimpmath.h>
#include "ppmtool.h"
#include "gimpressionist.h"
#include "libgimp/stdplugins-intl.h"
static int
readline (FILE *f, char *buffer, int len)
{
do
{
if (!fgets (buffer, len, f))
return -1;
}
while (buffer[0] == '#');
g_strchomp (buffer);
return 0;
}
void
ppm_kill (ppm_t *p)
{
g_free (p->col);
p->col = NULL;
p->height = p->width = 0;
}
void ppm_new (ppm_t *p, int xs, int ys)
{
int x;
guchar bgcol[3] = {0,0,0};
if (xs < 1)
xs = 1;
if (ys < 1)
ys = 1;
p->width = xs;
p->height = ys;
p->col = g_malloc (xs * 3 * ys);
for (x = 0; x < xs * 3 * ys; x += 3)
{
p->col[x+0] = bgcol[0];
p->col[x+1] = bgcol[1];
p->col[x+2] = bgcol[2];
}
}
void
get_rgb (ppm_t *s, float xo, float yo, guchar *d)
{
float ix, iy;
int x1, x2, y1, y2;
float x1y1, x2y1, x1y2, x2y2;
float r, g, b;
int bail = 0;
int rowstride = s->width * 3;
if (xo < 0.0)
bail=1;
else if (xo >= s->width-1)
{
xo = s->width-1;
#if 0
bail=1;
#endif
}
if (yo < 0.0)
bail=1;
else if (yo >= s->height-1)
{
yo= s->height-1;
#if 0
bail=1;
#endif
}
if (bail)
{
d[0] = d[1] = d[2] = 0;
return;
}
ix = (int)xo;
iy = (int)yo;
#if 0
x1 = wrap(ix, s->width);
x2 = wrap(ix+1, s->width);
y1 = wrap(iy, s->height);
y2 = wrap(iy+1, s->height);
#endif
x1 = ix; x2 = ix + 1;
y1 = iy; y2 = iy + 1;
#if 0
printf("x1=%d y1=%d x2=%d y2=%d\n",x1,y1,x2,y2);
#endif
x1y1 = (1.0 - xo + ix) * (1.0 - yo + iy);
x2y1 = (xo - ix) * (1.0 - yo + iy);
x1y2 = (1.0 - xo + ix) * (yo - iy);
x2y2 = (xo - ix) * (yo - iy);
r = s->col[y1 * rowstride + x1 * 3 + 0] * x1y1;
g = s->col[y1 * rowstride + x1 * 3 + 1] * x1y1;
b = s->col[y1 * rowstride + x1 * 3 + 2] * x1y1;
if (x2y1 > 0.0)
r += s->col[y1 * rowstride + x2 * 3 + 0] * x2y1;
if (x2y1 > 0.0)
g += s->col[y1 * rowstride + x2 * 3 + 1] * x2y1;
if (x2y1 > 0.0)
b += s->col[y1 * rowstride + x2 * 3 + 2] * x2y1;
if (x1y2 > 0.0)
r += s->col[y2 * rowstride + x1 * 3 + 0] * x1y2;
if (x1y2 > 0.0)
g += s->col[y2 * rowstride + x1 * 3 + 1] * x1y2;
if (x1y2 > 0.0)
b += s->col[y2 * rowstride + x1 * 3 + 2] * x1y2;
if (x2y2 > 0.0)
r += s->col[y2 * rowstride + x2 * 3 + 0] * x2y2;
if (x2y2 > 0.0)
g += s->col[y2 * rowstride + x2 * 3 + 1] * x2y2;
if (x2y2 > 0.0)
b += s->col[y2 * rowstride + x2 * 3 + 2] * x2y2;
d[0] = r;
d[1] = g;
d[2] = b;
}
void
resize (ppm_t *p, int nx, int ny)
{
int x, y;
float xs = p->width / (float)nx;
float ys = p->height / (float)ny;
ppm_t tmp = {0, 0, NULL};
ppm_new (&tmp, nx, ny);
for (y = 0; y < ny; y++)
{
guchar *row = tmp.col + y * tmp.width * 3;
for (x = 0; x < nx; x++)
{
get_rgb (p, x * xs, y * ys, &row[x * 3]);
}
}
ppm_kill (p);
p->width = tmp.width;
p->height = tmp.height;
p->col = tmp.col;
}
void
rescale (ppm_t *p, double sc)
{
resize (p, p->width * sc, p->height * sc);
}
void resize_fast (ppm_t *p, int nx, int ny)
{
int x, y;
float xs = p->width / (float)nx;
float ys = p->height / (float)ny;
ppm_t tmp = {0, 0, NULL};
ppm_new (&tmp, nx, ny);
for (y = 0; y < ny; y++)
{
for (x = 0; x < nx; x++)
{
gint rx = x * xs, ry = y * ys;
memcpy (&tmp.col[y * tmp.width * 3 + x * 3],
&p->col[ry * p->width * 3 + rx * 3],
3);
}
}
ppm_kill (p);
p->width = tmp.width;
p->height = tmp.height;
p->col = tmp.col;
}
struct _BrushHeader
{
unsigned int header_size; /* header_size = sz_BrushHeader + brush name */
unsigned int version; /* brush file version # */
unsigned int width; /* width of brush */
unsigned int height; /* height of brush */
unsigned int bytes; /* depth of brush in bytes--always 1 */
unsigned int magic_number;/* GIMP brush magic number */
unsigned int spacing; /* brush spacing */
};
static void
msb2lsb (unsigned int *i)
{
guchar *p = (guchar *)i, c;
c = p[1]; p[1] = p[2]; p[2] = c;
c = p[0]; p[0] = p[3]; p[3] = c;
}
static FILE *
fopen_from_search_path (const gchar * fn, const char * mode)
{
FILE * f;
gchar * full_filename;
f = g_fopen (fn, mode);
if (!f)
{
full_filename = findfile (fn);
f = g_fopen (full_filename, mode);
g_free (full_filename);
}
return f;
}
static void
load_gimp_brush (const gchar *fn, ppm_t *p)
{
FILE *f;
struct _BrushHeader hdr;
gchar *ptr;
gint x, y;
f = fopen_from_search_path (fn, "rb");
ppm_kill (p);
if (!f)
{
g_printerr ("load_gimp_brush: Unable to open file \"%s\"!\n",
gimp_filename_to_utf8 (fn));
ppm_new (p, 10,10);
return;
}
fread (&hdr, 1, sizeof (struct _BrushHeader), f);
for (x = 0; x < 7; x++)
msb2lsb (&((unsigned int *)&hdr)[x]);
ppm_new (p, hdr.width, hdr.height);
ptr = g_malloc (hdr.width);
fseek (f, hdr.header_size, SEEK_SET);
for (y = 0; y < p->height; y++)
{
fread (ptr, p->width, 1, f);
for (x = 0; x < p->width; x++)
{
int k = y * p->width * 3 + x * 3;
p->col[k+0] = p->col[k+1] = p->col[k+2] = ptr[x];
}
}
fclose (f);
g_free (ptr);
}
void
ppm_load (const char *fn, ppm_t *p)
{
char line[200];
int y, pgm = 0;
FILE *f;
if (!strcmp (&fn[strlen (fn)-4], ".gbr"))
{
load_gimp_brush(fn, p);
return;
}
f = fopen_from_search_path (fn, "rb");
ppm_kill (p);
if (!f)
{
g_printerr ("ppm_load: Unable to open file \"%s\"!\n",
gimp_filename_to_utf8 (fn));
ppm_new (p, 10,10);
return;
}
readline (f, line, 200);
if (strcmp (line, "P6"))
{
if (strcmp (line, "P5"))
{
fclose (f);
g_printerr ("ppm_load: File \"%s\" not PPM/PGM? (line=\"%s\")%c\n",
gimp_filename_to_utf8 (fn), line, 7);
ppm_new (p, 10,10);
return;
}
pgm = 1;
}
readline (f, line, 200);
p->width = atoi (line);
p->height = atoi (strchr (line, ' ')+1);
readline (f, line, 200);
if (strcmp (line, "255"))
{
fclose (f);
g_printerr ("ppm_load: File \"%s\" not valid PPM/PGM? (line=\"%s\")%c\n",
gimp_filename_to_utf8 (fn), line, 7);
ppm_new (p, 10,10);
return;
}
p->col = g_malloc (p->height * p->width * 3);
if (!pgm)
{
fread (p->col, p->height * 3 * p->width, 1, f);
}
else
{
guchar *tmpcol = g_malloc (p->width * p->height);
fread (tmpcol, p->height * p->width, 1, f);
for (y = 0; y < p->width * p->height * 3; y++) {
p->col[y] = tmpcol[y / 3];
}
g_free (tmpcol);
}
fclose (f);
}
void
fill (ppm_t *p, guchar *c)
{
int x, y;
if ((c[0] == c[1]) && (c[0] == c[2]))
{
guchar col = c[0];
for (y = 0; y < p->height; y++)
{
memset(p->col + y*p->width*3, col, p->width*3);
}
}
else
{
for (y = 0; y < p->height; y++)
{
guchar *row = p->col + y * p->width * 3;
for (x = 0; x < p->width; x++)
{
int k = x * 3;
row[k+0] = c[0];
row[k+1] = c[1];
row[k+2] = c[2];
}
}
}
}
void
ppm_copy (ppm_t *s, ppm_t *p)
{
ppm_kill (p);
p->width = s->width;
p->height = s->height;
p->col = g_memdup (s->col, p->width * 3 * p->height);
}
void
free_rotate (ppm_t *p, double amount)
{
int x, y;
double nx, ny;
ppm_t tmp = {0, 0, NULL};
double f = amount * G_PI * 2 / 360.0;
int rowstride = p->width * 3;
ppm_new (&tmp, p->width, p->height);
for (y = 0; y < p->height; y++)
{
for (x = 0; x < p->width; x++)
{
double r, d;
nx = fabs (x - p->width / 2.0);
ny = fabs (y - p->height / 2.0);
r = sqrt (nx * nx + ny * ny);
d = atan2 ((y - p->height / 2.0), (x - p->width / 2.0));
nx = (p->width / 2.0 + cos (d - f) * r);
ny = (p->height / 2.0 + sin (d - f) * r);
get_rgb (p, nx, ny, tmp.col + y * rowstride + x * 3);
}
}
ppm_kill (p);
p->width = tmp.width;
p->height = tmp.height;
p->col = tmp.col;
}
void
crop (ppm_t *p, int lx, int ly, int hx, int hy)
{
ppm_t tmp = {0,0,NULL};
int x, y;
int srowstride = p->width * 3;
int drowstride;
ppm_new (&tmp, hx - lx, hy - ly);
drowstride = tmp.width * 3;
for (y = ly; y < hy; y++)
for (x = lx; x < hx; x++)
memcpy (&tmp.col[(y - ly) * drowstride + (x - lx) * 3],
&p->col[y * srowstride + x * 3],
3);
ppm_kill (p);
p->col = tmp.col;
p->width = tmp.width;
p->height = tmp.height;
}
void
autocrop (ppm_t *p, int room)
{
int lx = 0, hx = p->width, ly = 0, hy = p->height;
int x, y, n = 0;
guchar tc[3];
ppm_t tmp = {0,0,NULL};
int rowstride = p->width * 3;
int drowstride;
/* upper */
memcpy (&tc, p->col, 3);
for (y = 0; y < p->height; y++)
{
n = 0;
for (x = 0; x < p->width; x++)
{
if (memcmp (&tc, &p->col[y*rowstride+x*3], 3))
{
n++;
break;
}
}
if (n)
break;
}
if (n)
ly = y;
#if 0
printf("ly = %d\n", ly);
#endif
/* lower */
memcpy (&tc, &p->col[(p->height - 1) * rowstride], 3);
for (y = p->height-1; y >= 0; y--)
{
n = 0;
for (x = 0; x < p->width; x++)
{
if (memcmp (&tc, &p->col[y*rowstride+x*3], 3))
{
n++;
break;
}
}
if (n)
break;
}
if (n)
hy = y+1;
if (hy >= p->height)
hy = p->height - 1;
#if 0
printf("hy = %d\n", hy);
#endif
/* left */
memcpy (&tc, &p->col[ly * rowstride], 3);
for (x = 0; x < p->width; x++)
{
n = 0;
for (y = ly; y <= hy && y < p->height; y++)
{
if (memcmp (&tc, &p->col[y * rowstride + x * 3], 3))
{
n++;
break;
}
}
if (n)
break;
}
if (n)
lx = x;
#if 0
printf("lx = %d\n", lx);
#endif
/* right */
memcpy
(&tc, &p->col[ly * rowstride + (p->width - 1) * 3], 3);
for (x = p->width-1; x >= 0; x--)
{
n = 0;
for (y = ly; y <= hy; y++)
{
if (memcmp (&tc, &p->col[y * rowstride + x * 3], 3))
{
n++;
break;
}
}
if (n)
break;
}
if (n)
hx = x + 1;
#if 0
printf("hx = %d\n", hx);
#endif
lx -= room; if (lx < 0) lx = 0;
ly -= room; if (ly < 0) ly = 0;
hx += room; if (hx >= p->width) hx = p->width - 1;
hy += room; if (hy >= p->height) hy = p->height - 1;
ppm_new (&tmp, hx - lx, hy - ly);
drowstride = tmp.width * 3;
for (y = ly; y < hy; y++)
for (x = lx; x < hx; x++)
memcpy (&tmp.col[(y - ly) * drowstride + (x - lx) * 3],
&p->col[y * rowstride + x * 3],
3);
ppm_kill (p);
p->col = tmp.col;
p->width = tmp.width;
p->height = tmp.height;
}
void
ppm_pad (ppm_t *p, int left,int right, int top, int bottom, guchar *bg)
{
int x, y;
ppm_t tmp = {0, 0, NULL};
ppm_new (&tmp, p->width + left + right, p->height + top + bottom);
for (y = 0; y < tmp.height; y++)
{
guchar *row, *srcrow;
row = tmp.col + y * tmp.width * 3;
if ((y < top) || (y >= tmp.height-bottom))
{
for (x = 0; x < tmp.width; x++)
{
int k = x * 3;
row[k+0] = bg[0];
row[k+1] = bg[1];
row[k+2] = bg[2];
}
continue;
}
srcrow = p->col + (y-top) * p->width * 3;
for (x = 0; x < left; x++)
{
int k = x * 3;
row[k+0] = bg[0];
row[k+1] = bg[1];
row[k+2] = bg[2];
}
for (; x < tmp.width-right; x++)
{
int k = y * tmp.width * 3 + x * 3;
tmp.col[k+0] = srcrow[(x - left) * 3 + 0];
tmp.col[k+1] = srcrow[(x - left) * 3 + 1];
tmp.col[k+2] = srcrow[(x - left) * 3 + 2];
}
for (; x < tmp.width; x++)
{
int k = x * 3;
row[k+0] = bg[0];
row[k+1] = bg[1];
row[k+2] = bg[2];
}
}
ppm_kill (p);
p->width = tmp.width;
p->height = tmp.height;
p->col = tmp.col;
}
void
ppm_save (ppm_t *p, const char *fn)
{
FILE *f = g_fopen (fn, "wb");
if (!f)
{
/*
* gimp_filename_to_utf8 () and g_strerror () return temporary strings
* that need not and should not be freed. So this call is OK.
* */
g_message (_("Failed to save PPM file '%s': %s"),
gimp_filename_to_utf8 (fn), g_strerror (errno));
return;
}
fprintf (f, "P6\n%d %d\n255\n", p->width, p->height);
fwrite (p->col, p->width * 3 * p->height, 1, f);
fclose (f);
}
void
edgepad (ppm_t *p, int left,int right, int top, int bottom)
{
int x, y;
ppm_t tmp = {0, 0, NULL};
guchar testcol[3] = {0, 255, 0};
int srowstride, drowstride;
ppm_new (&tmp, p->width+left+right, p->height+top+bottom);
fill (&tmp, testcol);
srowstride = p->width * 3;
drowstride = tmp.width * 3;
for (y = 0; y < top; y++)
{
memcpy (&tmp.col[y * drowstride + left * 3], p->col, srowstride);
}
for (; y-top < p->height; y++)
{
memcpy (&tmp.col[y * drowstride + left * 3],
p->col + (y - top) * srowstride,
srowstride);
}
for (; y < tmp.height ; y++)
{
memcpy (&tmp.col[y * drowstride + left * 3],
p->col + (p->height - 1) * srowstride,
srowstride);
}
for (y = 0; y < tmp.height; y++)
{
guchar *col, *tmprow;
tmprow = tmp.col + y*drowstride;
col = tmp.col + y*drowstride + left*3;
for (x = 0; x < left; x++)
{
memcpy (&tmprow[x * 3], col, 3);
}
col = tmp.col + y * drowstride + (tmp.width-right - 1) * 3;
for (x = 0; x < right; x++)
{
memcpy (&tmprow[(x + tmp.width - right - 1) * 3], col, 3);
}
}
ppm_kill (p);
p->width = tmp.width;
p->height = tmp.height;
p->col = tmp.col;
}
void
ppm_apply_gamma (ppm_t *p, float e, int r, int g, int b)
{
int x, l = p->width * 3 * p->height;
guchar xlat[256], *pix;
if (e > 0.0)
for (x = 0; x < 256; x++)
{
xlat[x] = pow ((x / 255.0), (1.0 / e)) * 255.0;
}
else if (e < 0.0)
for (x = 0; x < 256; x++)
{
xlat[255-x] = pow ((x / 255.0), (-1.0 / e)) * 255.0;
}
else
for (x = 0; x < 256; x++)
{
xlat[x] = 0;
}
pix = p->col;
if (r)
for (x = 0; x < l; x += 3)
pix[x] = xlat[pix[x]];
if (g)
for (x = 1; x < l; x += 3)
pix[x] = xlat[pix[x]];
if (b)
for (x = 2; x < l; x += 3)
pix[x] = xlat[pix[x]];
}
void
ppm_apply_brightness (ppm_t *p, float e, int r, int g, int b)
{
int x, l = p->width * 3 * p->height;
guchar xlat[256], *pix;
for (x = 0; x < 256; x++)
xlat[x] = x * e;
pix = p->col;
if (r)
for (x = 0; x < l; x += 3)
pix[x] = xlat[pix[x]];
if (g)
for (x = 1; x < l; x += 3)
pix[x] = xlat[pix[x]];
if (b)
for (x = 2; x < l; x += 3)
pix[x] = xlat[pix[x]];
}
void
blur (ppm_t *p, int xrad, int yrad)
{
int x, y, k;
int tx, ty;
ppm_t tmp = {0,0,NULL};
int r, g, b, n;
int rowstride = p->width * 3;
ppm_new (&tmp, p->width, p->height);
for (y = 0; y < p->height; y++)
{
for (x = 0; x < p->width; x++)
{
r = g = b = n = 0;
for (ty = y-yrad; ty <= y+yrad; ty++)
{
for (tx = x-xrad; tx <= x+xrad; tx++)
{
if (ty<0) continue;
if (ty>=p->height) continue;
if (tx<0) continue;
if (tx>=p->width) continue;
k = ty * rowstride + tx * 3;
r += p->col[k+0];
g += p->col[k+1];
b += p->col[k+2];
n++;
}
}
k = y * rowstride + x * 3;
tmp.col[k+0] = r / n;
tmp.col[k+1] = g / n;
tmp.col[k+2] = b / n;
}
}
ppm_kill (p);
p->width = tmp.width;
p->height = tmp.height;
p->col = tmp.col;
}
void
ppm_put_rgb_fast (ppm_t *s, float xo, float yo, guchar *d)
{
guchar *tp;
tp = s->col + s->width * 3 * (int)(yo + 0.5) + 3 * (int)(xo + 0.5);
tp[0] = d[0];
tp[1] = d[1];
tp[2] = d[2];
}
void
ppm_put_rgb (ppm_t *s, float xo, float yo, guchar *d)
{
int x, y;
float aa, ab, ba, bb;
int k, rowstride = s->width * 3;
x = xo;
y = yo;
if ((x < 0) || (y < 0) || (x >= s->width-1) || (y >= s->height-1))
return;
xo -= x;
yo -= y;
aa = (1.0 - xo) * (1.0 - yo);
ab = xo * (1.0 - yo);
ba = (1.0 - xo) * yo;
bb = xo * yo;
k = y * rowstride + x * 3;
s->col[k+0] *= (1.0 - aa);
s->col[k+1] *= (1.0 - aa);
s->col[k+2] *= (1.0 - aa);
s->col[k+3] *= (1.0 - ab);
s->col[k+4] *= (1.0 - ab);
s->col[k+5] *= (1.0 - ab);
s->col[k+rowstride+0] *= (1.0 - ba);
s->col[k+rowstride+1] *= (1.0 - ba);
s->col[k+rowstride+2] *= (1.0 - ba);
s->col[k+rowstride+3] *= (1.0 - bb);
s->col[k+rowstride+4] *= (1.0 - bb);
s->col[k+rowstride+5] *= (1.0 - bb);
s->col[k+0] += aa * d[0];
s->col[k+1] += aa * d[1];
s->col[k+2] += aa * d[2];
s->col[k+3] += ab * d[0];
s->col[k+4] += ab * d[1];
s->col[k+5] += ab * d[2];
s->col[k+rowstride+0] += ba * d[0];
s->col[k+rowstride+1] += ba * d[1];
s->col[k+rowstride+2] += ba * d[2];
s->col[k+rowstride+3] += bb * d[0];
s->col[k+rowstride+4] += bb * d[1];
s->col[k+rowstride+5] += bb * d[2];
}
void
ppm_drawline (ppm_t *p, float fx, float fy, float tx, float ty, guchar *col)
{
float i;
float d, x, y;
if (fabs (fx - tx) > fabs ( fy - ty))
{
if (fx > tx)
{
i = tx; tx = fx; fx = i; i = ty; ty = fy; fy = i;
}
d = (ty - fy) / (tx - fx);
y = fy;
for (x = fx; x <= tx; x += 1.0)
{
ppm_put_rgb (p, x, y, col);
y += d;
}
}
else
{
if (fy > ty)
{
i = tx; tx = fx; fx = i; i = ty; ty = fy; fy = i;
}
d = (tx - fx) / (ty - fy);
x = fx;
for (y = fy; y <= ty; y += 1.0)
{
ppm_put_rgb (p, x, y, col);
x += d;
}
}
}