909 lines
19 KiB
C
909 lines
19 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <glib/gstdio.h>
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#include <libpika/pika.h>
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#include <libpikamath/pikamath.h>
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#include "ppmtool.h"
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#include "pikaressionist.h"
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#include "libpika/stdplugins-intl.h"
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static int
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readline (FILE *f, char *buffer, int len)
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{
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do
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{
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if (!fgets (buffer, len, f))
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return -1;
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}
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while (buffer[0] == '#');
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g_strchomp (buffer);
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return 0;
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}
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void
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ppm_kill (ppm_t *p)
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{
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g_free (p->col);
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p->col = NULL;
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p->height = p->width = 0;
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}
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void ppm_new (ppm_t *p, int xs, int ys)
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{
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int x;
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guchar bgcol[3] = {0,0,0};
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if (xs < 1)
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xs = 1;
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if (ys < 1)
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ys = 1;
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p->width = xs;
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p->height = ys;
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p->col = g_malloc (xs * 3 * ys);
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for (x = 0; x < xs * 3 * ys; x += 3)
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{
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p->col[x+0] = bgcol[0];
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p->col[x+1] = bgcol[1];
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p->col[x+2] = bgcol[2];
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}
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}
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void
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get_rgb (ppm_t *s, float xo, float yo, guchar *d)
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{
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float ix, iy;
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int x1, x2, y1, y2;
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float x1y1, x2y1, x1y2, x2y2;
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float r, g, b;
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int bail = 0;
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int rowstride = s->width * 3;
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if (xo < 0.0)
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bail=1;
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else if (xo >= s->width-1)
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{
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xo = s->width-1;
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#if 0
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bail=1;
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#endif
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}
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if (yo < 0.0)
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bail=1;
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else if (yo >= s->height-1)
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{
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yo= s->height-1;
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#if 0
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bail=1;
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#endif
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}
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if (bail)
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{
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d[0] = d[1] = d[2] = 0;
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return;
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}
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ix = (int)xo;
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iy = (int)yo;
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#if 0
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x1 = wrap(ix, s->width);
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x2 = wrap(ix+1, s->width);
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y1 = wrap(iy, s->height);
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y2 = wrap(iy+1, s->height);
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#endif
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x1 = ix; x2 = ix + 1;
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y1 = iy; y2 = iy + 1;
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#if 0
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printf("x1=%d y1=%d x2=%d y2=%d\n",x1,y1,x2,y2);
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#endif
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x1y1 = (1.0 - xo + ix) * (1.0 - yo + iy);
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x2y1 = (xo - ix) * (1.0 - yo + iy);
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x1y2 = (1.0 - xo + ix) * (yo - iy);
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x2y2 = (xo - ix) * (yo - iy);
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r = s->col[y1 * rowstride + x1 * 3 + 0] * x1y1;
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g = s->col[y1 * rowstride + x1 * 3 + 1] * x1y1;
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b = s->col[y1 * rowstride + x1 * 3 + 2] * x1y1;
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if (x2y1 > 0.0)
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r += s->col[y1 * rowstride + x2 * 3 + 0] * x2y1;
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if (x2y1 > 0.0)
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g += s->col[y1 * rowstride + x2 * 3 + 1] * x2y1;
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if (x2y1 > 0.0)
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b += s->col[y1 * rowstride + x2 * 3 + 2] * x2y1;
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if (x1y2 > 0.0)
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r += s->col[y2 * rowstride + x1 * 3 + 0] * x1y2;
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if (x1y2 > 0.0)
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g += s->col[y2 * rowstride + x1 * 3 + 1] * x1y2;
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if (x1y2 > 0.0)
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b += s->col[y2 * rowstride + x1 * 3 + 2] * x1y2;
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if (x2y2 > 0.0)
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r += s->col[y2 * rowstride + x2 * 3 + 0] * x2y2;
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if (x2y2 > 0.0)
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g += s->col[y2 * rowstride + x2 * 3 + 1] * x2y2;
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if (x2y2 > 0.0)
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b += s->col[y2 * rowstride + x2 * 3 + 2] * x2y2;
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d[0] = r;
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d[1] = g;
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d[2] = b;
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}
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void
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resize (ppm_t *p, int nx, int ny)
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{
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int x, y;
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float xs = p->width / (float)nx;
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float ys = p->height / (float)ny;
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ppm_t tmp = {0, 0, NULL};
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ppm_new (&tmp, nx, ny);
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for (y = 0; y < ny; y++)
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{
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guchar *row = tmp.col + y * tmp.width * 3;
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for (x = 0; x < nx; x++)
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{
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get_rgb (p, x * xs, y * ys, &row[x * 3]);
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}
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}
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ppm_kill (p);
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p->width = tmp.width;
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p->height = tmp.height;
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p->col = tmp.col;
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}
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void
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rescale (ppm_t *p, double sc)
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{
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resize (p, p->width * sc, p->height * sc);
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}
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void resize_fast (ppm_t *p, int nx, int ny)
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{
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int x, y;
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float xs = p->width / (float)nx;
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float ys = p->height / (float)ny;
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ppm_t tmp = {0, 0, NULL};
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ppm_new (&tmp, nx, ny);
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for (y = 0; y < ny; y++)
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{
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for (x = 0; x < nx; x++)
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{
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gint rx = x * xs, ry = y * ys;
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memcpy (&tmp.col[y * tmp.width * 3 + x * 3],
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&p->col[ry * p->width * 3 + rx * 3],
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3);
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}
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}
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ppm_kill (p);
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p->width = tmp.width;
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p->height = tmp.height;
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p->col = tmp.col;
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}
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struct _BrushHeader
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{
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unsigned int header_size; /* header_size = sz_BrushHeader + brush name */
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unsigned int version; /* brush file version # */
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unsigned int width; /* width of brush */
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unsigned int height; /* height of brush */
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unsigned int bytes; /* depth of brush in bytes--always 1 */
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unsigned int magic_number;/* PIKA brush magic number */
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unsigned int spacing; /* brush spacing */
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};
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static void
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msb2lsb (unsigned int *i)
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{
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guchar *p = (guchar *)i, c;
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c = p[1]; p[1] = p[2]; p[2] = c;
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c = p[0]; p[0] = p[3]; p[3] = c;
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}
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static FILE *
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fopen_from_search_path (const gchar * fn, const char * mode)
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{
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FILE * f;
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gchar * full_filename;
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f = g_fopen (fn, mode);
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if (!f)
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{
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full_filename = findfile (fn);
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f = g_fopen (full_filename, mode);
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g_free (full_filename);
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}
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return f;
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}
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static void
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load_pika_brush (const gchar *fn, ppm_t *p)
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{
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FILE *f;
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struct _BrushHeader hdr;
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gchar *ptr;
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gint x, y;
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f = fopen_from_search_path (fn, "rb");
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ppm_kill (p);
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if (!f)
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{
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g_printerr ("load_pika_brush: Unable to open file \"%s\"!\n",
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pika_filename_to_utf8 (fn));
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ppm_new (p, 10,10);
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return;
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}
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fread (&hdr, 1, sizeof (struct _BrushHeader), f);
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for (x = 0; x < 7; x++)
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msb2lsb (&((unsigned int *)&hdr)[x]);
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ppm_new (p, hdr.width, hdr.height);
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ptr = g_malloc (hdr.width);
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fseek (f, hdr.header_size, SEEK_SET);
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for (y = 0; y < p->height; y++)
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{
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fread (ptr, p->width, 1, f);
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for (x = 0; x < p->width; x++)
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{
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int k = y * p->width * 3 + x * 3;
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p->col[k+0] = p->col[k+1] = p->col[k+2] = ptr[x];
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}
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}
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fclose (f);
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g_free (ptr);
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}
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void
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ppm_load (const char *fn, ppm_t *p)
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{
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char line[200];
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int y, pgm = 0;
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FILE *f;
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if (!strcmp (&fn[strlen (fn)-4], ".gbr"))
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{
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load_pika_brush(fn, p);
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return;
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}
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f = fopen_from_search_path (fn, "rb");
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ppm_kill (p);
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if (!f)
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{
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g_printerr ("ppm_load: Unable to open file \"%s\"!\n",
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pika_filename_to_utf8 (fn));
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ppm_new (p, 10,10);
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return;
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}
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readline (f, line, 200);
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if (strcmp (line, "P6"))
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{
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if (strcmp (line, "P5"))
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{
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fclose (f);
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g_printerr ("ppm_load: File \"%s\" not PPM/PGM? (line=\"%s\")%c\n",
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pika_filename_to_utf8 (fn), line, 7);
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ppm_new (p, 10,10);
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return;
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}
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pgm = 1;
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}
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readline (f, line, 200);
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p->width = atoi (line);
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p->height = atoi (strchr (line, ' ')+1);
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readline (f, line, 200);
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if (strcmp (line, "255"))
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{
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fclose (f);
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g_printerr ("ppm_load: File \"%s\" not valid PPM/PGM? (line=\"%s\")%c\n",
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pika_filename_to_utf8 (fn), line, 7);
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ppm_new (p, 10,10);
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return;
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}
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p->col = g_malloc (p->height * p->width * 3);
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if (!pgm)
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{
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fread (p->col, p->height * 3 * p->width, 1, f);
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}
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else
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{
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guchar *tmpcol = g_malloc (p->width * p->height);
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fread (tmpcol, p->height * p->width, 1, f);
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for (y = 0; y < p->width * p->height * 3; y++) {
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p->col[y] = tmpcol[y / 3];
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}
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g_free (tmpcol);
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}
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fclose (f);
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}
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void
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fill (ppm_t *p, guchar *c)
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{
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int x, y;
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if ((c[0] == c[1]) && (c[0] == c[2]))
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{
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guchar col = c[0];
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for (y = 0; y < p->height; y++)
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{
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memset(p->col + y*p->width*3, col, p->width*3);
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}
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}
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else
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{
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for (y = 0; y < p->height; y++)
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{
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guchar *row = p->col + y * p->width * 3;
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for (x = 0; x < p->width; x++)
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{
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int k = x * 3;
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row[k+0] = c[0];
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row[k+1] = c[1];
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row[k+2] = c[2];
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}
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}
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}
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}
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void
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ppm_copy (ppm_t *s, ppm_t *p)
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{
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ppm_kill (p);
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p->width = s->width;
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p->height = s->height;
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p->col = g_memdup2 (s->col, p->width * 3 * p->height);
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}
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void
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free_rotate (ppm_t *p, double amount)
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{
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int x, y;
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double nx, ny;
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ppm_t tmp = {0, 0, NULL};
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double f = amount * G_PI * 2 / 360.0;
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int rowstride = p->width * 3;
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ppm_new (&tmp, p->width, p->height);
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for (y = 0; y < p->height; y++)
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{
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for (x = 0; x < p->width; x++)
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{
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double r, d;
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nx = fabs (x - p->width / 2.0);
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ny = fabs (y - p->height / 2.0);
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r = sqrt (nx * nx + ny * ny);
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d = atan2 ((y - p->height / 2.0), (x - p->width / 2.0));
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nx = (p->width / 2.0 + cos (d - f) * r);
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ny = (p->height / 2.0 + sin (d - f) * r);
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get_rgb (p, nx, ny, tmp.col + y * rowstride + x * 3);
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}
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}
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ppm_kill (p);
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p->width = tmp.width;
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p->height = tmp.height;
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p->col = tmp.col;
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}
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void
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crop (ppm_t *p, int lx, int ly, int hx, int hy)
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{
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ppm_t tmp = {0,0,NULL};
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int x, y;
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int srowstride = p->width * 3;
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int drowstride;
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ppm_new (&tmp, hx - lx, hy - ly);
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drowstride = tmp.width * 3;
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for (y = ly; y < hy; y++)
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for (x = lx; x < hx; x++)
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memcpy (&tmp.col[(y - ly) * drowstride + (x - lx) * 3],
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&p->col[y * srowstride + x * 3],
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3);
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ppm_kill (p);
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p->col = tmp.col;
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p->width = tmp.width;
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p->height = tmp.height;
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}
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void
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autocrop (ppm_t *p, int room)
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{
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int lx = 0, hx = p->width, ly = 0, hy = p->height;
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int x, y, n = 0;
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guchar tc[3];
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ppm_t tmp = {0,0,NULL};
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int rowstride = p->width * 3;
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int drowstride;
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/* upper */
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memcpy (&tc, p->col, 3);
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for (y = 0; y < p->height; y++)
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{
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n = 0;
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for (x = 0; x < p->width; x++)
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{
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if (memcmp (&tc, &p->col[y*rowstride+x*3], 3))
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{
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n++;
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break;
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}
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}
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if (n)
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break;
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}
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if (n)
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ly = y;
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#if 0
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printf("ly = %d\n", ly);
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#endif
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/* lower */
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memcpy (&tc, &p->col[(p->height - 1) * rowstride], 3);
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for (y = p->height-1; y >= 0; y--)
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{
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n = 0;
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for (x = 0; x < p->width; x++)
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{
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if (memcmp (&tc, &p->col[y*rowstride+x*3], 3))
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{
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n++;
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break;
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}
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}
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if (n)
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break;
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}
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if (n)
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hy = y+1;
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if (hy >= p->height)
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hy = p->height - 1;
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#if 0
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printf("hy = %d\n", hy);
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#endif
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/* left */
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memcpy (&tc, &p->col[ly * rowstride], 3);
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for (x = 0; x < p->width; x++)
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{
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n = 0;
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for (y = ly; y <= hy && y < p->height; y++)
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{
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if (memcmp (&tc, &p->col[y * rowstride + x * 3], 3))
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{
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n++;
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break;
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}
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}
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if (n)
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break;
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}
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if (n)
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lx = x;
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|
#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)
|
|
{
|
|
/*
|
|
* pika_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"),
|
|
pika_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;
|
|
}
|
|
}
|
|
}
|
