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/**
** sipp - SImple Polygon Processor
**
** A general 3d graphic package
**
** Copyright Equivalent Software HB 1992
**
** 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 1, or 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 can receive a copy of the GNU General Public License from the
** Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**/
/**
** sipp_pixmap.c - A sample pixmap for use in SIPP and routines to use it.
**/
#include <sys/types.h>
#include <stdio.h>
#include <sipp.h>
#include <smalloc.h>
#include <sipp_pixmap.h>
/* ================================================================ */
/*
* Return a pointer to a new Sipp_pixmap, with the size WIDTH x HEIGHT.
*/
Sipp_pixmap *
sipp_pixmap_create(width, height)
int width;
int height;
{
Sipp_pixmap * pm;
pm = (Sipp_pixmap *) smalloc(sizeof(Sipp_pixmap));
pm->width = width;
pm->height = height;
pm->buffer = (u_char *) scalloc(3 * width * height, sizeof(u_char));
return pm;
}
/*
* Destruct a pixmap, and free allocated memory.
*/
void
sipp_pixmap_destruct(pm)
Sipp_pixmap * pm;
{
if (pm != NULL) {
if (pm->buffer != NULL) {
sfree(pm->buffer);
}
sfree(pm);
}
}
/*
* Set the pixel at (X, Y) in Sipp_pixmap PM to the color
* (RED, GRN, BLU).
*/
void
sipp_pixmap_set_pixel(pm, x, y, red, grn, blu)
Sipp_pixmap * pm;
int x;
int y;
u_char red;
u_char grn;
u_char blu;
{
u_char * cp;
if (x < 0 || y < 0 || x >= pm->width || y >= pm->height) {
fprintf(stderr,
"Tried to write to pixel (%d, %d) in a Sipp_pixmap which was only %d x %d.\n",
x, y, pm->width, pm->height);
} else {
cp = pm->buffer + 3 * (y * pm->width + x);
*cp++ = red;
*cp++ = grn;
*cp = blu;
}
}
/*
* Write the Sipp_pixmap PM to the open file FILE.
*/
void
sipp_pixmap_write(file, pm)
FILE * file;
Sipp_pixmap * pm;
{
u_char * byte;
int nbytes;
int i;
fprintf(file, "P6\n");
fprintf(file, "#Image rendered with SIPP %s\n", SIPP_VERSION);
fprintf(file, "%d\n%d\n255\n", pm->width, pm->height);
byte = pm->buffer;
nbytes = pm->width * pm->height;
for (i = 0; i < nbytes; ++i) {
putc(*byte++, file);
putc(*byte++, file);
putc(*byte++, file);
}
}
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