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-rw-r--r--plug-ins/gimpressionist/ppmtool.c904
1 files changed, 904 insertions, 0 deletions
diff --git a/plug-ins/gimpressionist/ppmtool.c b/plug-ins/gimpressionist/ppmtool.c
new file mode 100644
index 0000000..307779e
--- /dev/null
+++ b/plug-ins/gimpressionist/ppmtool.c
@@ -0,0 +1,904 @@
+/* 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;
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 15:56:53 +0000