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/* -----------------------------------------------------------------------------
* color.c
*
* Colormaps
*
* Author(s) : David Beazley (beazley@cs.uchicago.edu)
* Copyright (C) 1995-1996
*
* See the file LICENSE for information on usage and redistribution.
* ----------------------------------------------------------------------------- */
#define COLORMAP
#include "gifplot.h"
#include <string.h>
/* ------------------------------------------------------------------------
ColorMap *new_ColorMap(char *filename)
Read a colormap from a file.
------------------------------------------------------------------------ */
ColorMap *new_ColorMap(char *filename) {
ColorMap *c;
FILE *cm;
void ColorMap_default(ColorMap *);
if (!filename) {
c = (ColorMap *) malloc(sizeof(ColorMap));
c->cmap = (unsigned char *) malloc(768*sizeof(char));
c->name = 0;
ColorMap_default(c);
return c;
}
if (strlen(filename) == 0) {
c = (ColorMap *) malloc(sizeof(ColorMap));
c->cmap = (unsigned char *) malloc(768*sizeof(char));
ColorMap_default(c);
return c;
}
if ((cm = fopen(filename,"rb")) == NULL) {
return (ColorMap *) 0;
}
c = (ColorMap *) malloc(sizeof(ColorMap));
c->cmap = (unsigned char *) malloc(768*sizeof(char));
if (fread(c->cmap, 768, 1, cm) != 1) {
free((char *)c->cmap);
free((char *)c);
fclose(cm);
return (ColorMap *) 0;
}
fclose(cm);
c->name = (char *) malloc(strlen(filename)+1);
strcpy(c->name, filename);
ColorMap_default(c);
return c;
}
/* --------------------------------------------------------------------------
delete_ColorMap(ColorMap *cm)
Destroy a ColorMap
-------------------------------------------------------------------------- */
void delete_ColorMap(ColorMap *cm) {
if (cm) {
free((char *)cm->cmap);
if (cm->name)
free((char *)cm->name);
free((char *)cm);
}
}
/* --------------------------------------------------------------------------
ColorMap_default(ColorMap *cm)
This function fills in default values for the first 8 entries of the
colormap. These are *fixed* values---used internally.
-------------------------------------------------------------------------- */
void ColorMap_default(ColorMap *cm) {
unsigned char *r,*g,*b;
if (cm) {
r = cm->cmap;
g = cm->cmap+256;
b = cm->cmap+512;
r[0] = 0; g[0] = 0; b[0] = 0; /* BLACK */
r[1] = 255; g[1] = 255; b[1] = 255; /* WHITE */
r[2] = 255; g[2] = 0; b[2] = 0; /* RED */
r[3] = 0; g[3] = 255; b[3] = 0; /* GREEN */
r[4] = 0; g[4] = 0; b[4] = 255; /* BLUE */
r[5] = 255; g[5] = 255; b[5] = 0; /* YELLOW */
r[6] = 0; g[6] = 255; b[6] = 255; /* CYAN */
r[7] = 255; g[7] = 0; b[7] = 255; /* MAGENTA */
}
}
void ColorMap_assign(ColorMap *cm, int index, int r, int g, int b) {
unsigned char *rb,*gb,*bb;
rb = cm->cmap;
gb = cm->cmap+256;
bb = cm->cmap+512;
rb[index] = r;
gb[index] = g;
bb[index] = b;
}
int ColorMap_getitem(ColorMap *cm, int index) {
if ((index < 0) && (index >= 768)) return -1;
return cm->cmap[index];
}
void ColorMap_setitem(ColorMap *cm, int index, int value) {
if ((index < 0) && (index >= 768)) return;
cm->cmap[index]=value;
}
/* --------------------------------------------------------------------
ColorMap_write(ColorMap *cm, char *filename)
Write out a colormap to disk.
-------------------------------------------------------------------- */
int ColorMap_write(ColorMap *cm, char *filename) {
FILE *f;
if (!cm) return -1;
if (!filename) return -1;
if (strlen(filename) == 0) return -1;
f = fopen(filename,"w");
fwrite(cm->cmap,768,1,f);
fclose(f);
return 0;
}
#undef COLORMAP
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