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Fractal Frenzy 1
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rle.c
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C/C++ Source or Header
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1991-05-20
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11KB
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440 lines
/*
* rle - read in a Utah RLE Toolkit type image.
*
* Author: Graeme Gill
* Date: 30/5/90
*
* Bugs - doesn't free up memory used by rle functions.
*
*/
#undef DEBUG
#ifdef DEBUG
# define debug(xx) fprintf(stderr,xx)
#else
# define debug(xx)
#endif
#define MIN(a,b) ( (a)<(b) ? (a) : (b))
#include <math.h>
#include <stdio.h>
#include "image.h"
#include "rle.h"
void dithermap();
/* input file stuff */
static int ptype; /* picture type : */
#define BW_NM 0 /* black and white, no map */
#define BW_M 1 /* black and white, and a map */
#define SC_M 2 /* single colour channel and colour map */
#define C_NM 3 /* full colour, no maps */
#define C_M 4 /* full colour with colour maps */
static rle_pixel **fmaps; /* file colour maps from buildmap() */
static unsigned char **scan; /* buffer for input data */
static int x_min; /* copy of picture x_min */
static int y_min; /* copy of picture y_min */
/* option stuff (Not functional) */
static float disp_gam = 1.0; /* default display gamma correction factor */
static int iflag=0; /* user suplied image gamma */
static float img_gam = 1.0; /* image gamma */
static int bwflag = 0; /* black and white flag */
static int gammamap[256];
static int background[3] = {0,0,0}; /* our background colour */
/* stuff for dithering colour pictures */
int colmap[216][3]; /* for dither map */
int magic[16][16];
int modN[256];
int divN[256];
int rleIdent(fullname, name)
char *fullname, *name;
{
ZFILE *rlefile;
int x_len,y_len;
int rv;
debug("rleIdent called\n");
rlefile = zopen(fullname);
if(!rlefile)
{
perror("rleIdent: Unable to open file");
return(0);
}
debug("rleIdent: Opened file ok\n");
sv_globals.svfb_fd = rlefile;
rv = rle_get_setup(&sv_globals);
debug("rleIdent: got setup ok\n");
zclose(rlefile);
debug("rleIdent: closed file ok\n");
switch(rv)
{
case -1:
return 0; /* Not rle format */
case 0:
/* now figure out the picture type */
switch(sv_globals.sv_ncolors)
{
case 0:
perror("rleIdent: no colour channels to display");
return(0);
case 1:
x_len = sv_globals.sv_xmax - sv_globals.sv_xmin + 1;
y_len = sv_globals.sv_ymax - sv_globals.sv_ymin + 1;
printf("%s is a %dx%d", name, x_len, y_len);
switch(sv_globals.sv_ncmap) {
case 0:
/* black and white, no map */
printf(" 8 bit grey scale RLE image with no map\n");
break;
case 1:
/* black and white with a map */
printf(" 8 bit grey scale RLE image with map\n");
break;
case 3:
/* single channel encoded colour with decoding map */
printf(" 8 bit color RLE image with color map\n");
break;
default:
perror(" 8 bit RLE image with an illegal color map\n");
return 0;
}
break;
case 3:
x_len = sv_globals.sv_xmax - sv_globals.sv_xmin + 1;
y_len = sv_globals.sv_ymax - sv_globals.sv_ymin + 1;
printf("%s is a %dx%d", name, x_len, y_len);
switch(sv_globals.sv_ncmap)
{
case 0:
printf(" 24 bit color RLE image with no map\n");
break;
case 3:
printf(" 24 bit color RLE image with colour map\n");
break;
default:
printf(" 24 bit color RLE image with an illegal color map\n");
return 0;
}
break;
default:
x_len = sv_globals.sv_xmax - sv_globals.sv_xmin + 1;
y_len = sv_globals.sv_ymax - sv_globals.sv_ymin + 1;
printf("%s is a %dx%d", name, x_len, y_len);
printf(" RLE image with an illegal number of color planes\n");
return 0;
}
return 1;
default: /* Some sort of error */
/* perror("rleIdent");*/
return 0;
}
}
Image *rleLoad(fullname,name,verbose)
char *fullname,*name;
unsigned int verbose;
{
int x_len, y_len;
int i,j;
ZFILE *rlefile;
int ncol; /* number of colors */
int depth;
unsigned char *bufp;
Image *image;
unsigned char *buf;
dith_levels = 256; /* aim for 128 levels of each colour */
debug("rleLoad called\n");
rlefile = zopen(fullname);
if(!rlefile)
{
perror("rleLoad: Cannot open input file");
return(NULL);
}
sv_globals.svfb_fd = rlefile;
debug("rleLoad: About to call get_setup\n");
if(rle_get_setup( &sv_globals )) {
zclose(rlefile);
return(NULL);
}
debug("rleLoad: get_setup called ok\n");
if(iflag == 1) /* -i flag */
img_gam = 1.0/img_gam; /* convert to display gamma */
/* If no image gamma on command line, check comments in file */
if (!iflag)
{
char * v;
if ( (v = rle_getcom( "image_gamma", &sv_globals )) != NULL )
{
img_gam = atof( v );
/* Protect against bogus information */
if ( img_gam == 0.0 )
img_gam = 1.0;
else
img_gam = 1.0 / img_gam; /* convert to display gamma */
}
else if ( (v = rle_getcom( "display_gamma", &sv_globals )) != NULL )
{
img_gam = atof( v );
/* Protect */
if ( img_gam == 0.0 )
img_gam = 1.0;
}
}
x_len = sv_globals.sv_xmax - sv_globals.sv_xmin + 1;
y_len = sv_globals.sv_ymax - sv_globals.sv_ymin + 1;
x_min = sv_globals.sv_xmin;
y_min = sv_globals.sv_ymin;
/* fix this so that we don't waste space */
sv_globals.sv_xmax -= sv_globals.sv_xmin;
sv_globals.sv_xmin = 0;
/* turn off the alpha channel (don't waste time and space)*/
sv_globals.sv_alpha = 0;
SV_CLR_BIT(sv_globals,SV_ALPHA);
/* for now, force background clear */
if(sv_globals.sv_background ==1) /* danger setting */
{
debug("Forcing clear of background\n");
sv_globals.sv_background = 2;
if(sv_globals.sv_bg_color==0) /* if none allocated */
sv_globals.sv_bg_color = background; /* use this one */
}
/* now figure out the picture type */
switch(sv_globals.sv_ncolors)
{
case 0:
perror("rleLoad: no colour channels to display");
zclose(rlefile);
return(NULL);
case 1:
switch(sv_globals.sv_ncmap)
{
case 0:
ptype = BW_NM; /* black and white, no map */
break;
case 1:
ptype = BW_M; /* black and white with a map */
break;
case 3:
ptype = SC_M; /* single channel encoded colour with decoding map */
break;
default:
zclose(rlefile);
perror("rleLoad: Illegal number of maps for one colour channel");
return(NULL);
}
break;
case 3:
switch(sv_globals.sv_ncmap)
{
case 0:
ptype = C_NM; /* colour, no map */
break;
case 3:
ptype = C_M; /* colour with maps */
break;
default:
perror("rleLoad: Illegal number of maps for colour picture");
zclose(rlefile);
return(NULL);
}
break;
default:
perror("rleLoad: Illegal number of colour channels");
zclose(rlefile);
return(NULL);
}
if(verbose)
{
printf("%s is a %dx%d",name,x_len,y_len);
switch(ptype)
{
case BW_NM:
printf(" 8 bit grey scale RLE image with no map");
break;
case BW_M:
printf(" 8 bit grey scale RLE image with map");
break;
case SC_M:
printf(" 8 bit RLE image with colour map");
break;
case C_NM:
printf(" 24 bit RLE image with no map (will dither to 8 bits)");
break;
case C_M:
printf(" 24 bit RLE image with color map (will dither to 8 bits)");
break;
}
printf(", with gamma of %4.2f\n",img_gam);
}
znocache(rlefile);
if(ptype==SC_M)
{ /* don't mess with the image, but change their colour map a bit if needed */
disp_gam /= img_gam; /* amount to change their map */
img_gam = 1.0; /* not to the image coming in */
}
/* get hold of the colour maps, and set to undo their images gamma */
fmaps = buildmap(&sv_globals,sv_globals.sv_ncolors,img_gam);
/* now we had better sort out the picture data */
debug("done colour map\n");
/* rle stufff */
/* Get space for a full colour scan line */
scan = (unsigned char **) lmalloc( (sv_globals.sv_ncolors +
sv_globals.sv_alpha) *
sizeof( unsigned char * ) );
for ( i = 0; i < sv_globals.sv_ncolors + sv_globals.sv_alpha; i++ )
scan[i] = (unsigned char *)lmalloc(x_len);
if ( sv_globals.sv_alpha )
scan++;
debug("got space for get_row\n");
depth = 8; /* We always supply 8bit images */
image = newRGBImage(x_len,y_len,depth);
image->title = dupString(name);
debug("got image structure\n");
buf = image->data;
/* If we are going to dither - then create the dither matrix. */
if(!bwflag && ptype!=SC_M && ptype != BW_NM && ptype != BW_M)
{
dith_np2 = 1; /* allow non-power of 2 dither map size */
dithermap( 6, disp_gam, colmap, divN, modN, magic );
}
debug("About to read image in\n");
bufp = buf + (y_len-1) * x_len;
for(j=y_len;j>0;j--,bufp -= x_len)
{
rle_getrow(&sv_globals,scan);
switch(ptype)
{
case SC_M:
memcpy(bufp,&scan[0][0],x_len);
break;
case BW_NM:
case BW_M:
bw_m_line(bufp,x_len);
break;
case C_NM:
case C_M:
c_m_line(bufp,x_len,j);
break;
}
}
debug("Image Read in\n");
/* Deal with colour maps */
/* set up our gamma correction */
make_gamma(disp_gam,gammamap); /* we'll need it */
debug("Creating color map\n");
/* now load an appropriate colour map */
if(!bwflag && ptype==SC_M)
{
/* use their maps & correct their gamma */
ncol = 1<<sv_globals.sv_cmaplen; /* number of entries */
for(i=0;i<ncol;i++)
{
*(image->rgb.red + i) = gammamap[fmaps[0][i]]<<8;
*(image->rgb.green + i) = gammamap[fmaps[1][i]]<<8;
*(image->rgb.blue + i) = gammamap[fmaps[2][i]]<<8;
}
}
else if(bwflag || ptype == BW_NM || ptype == BW_M)
{
/* load a black and white map (gamma corrected for this display)*/
ncol = 256; /* don't know whats been used */
for(i=0;i<ncol;i++)
{
*(image->rgb.red + i) =
*(image->rgb.green + i) =
*(image->rgb.blue + i) = gammamap[i]<<8;
}
}
else
{
/* must be colour, so use dither map (gamma corrected for this display)*/
ncol = 6*6*6;
/* Dither map has already been created above */
for(i = 0; i < ncol; i++)
{
*(image->rgb.red + i) = colmap[i][0]<<8;
*(image->rgb.green + i) = colmap[i][1]<<8;
*(image->rgb.blue + i) = colmap[i][2]<<8;
}
}
image->rgb.used = ncol;
zclose(rlefile);
debug("finished\n");
return(image);
}
#define DMAP(v,x,y) (modN[v]>magic[x][y] ? divN[v] + 1 : divN[v])
/* run the black and white through its map */
bw_m_line(dp,number)
int number;
register unsigned char *dp;
{
register unsigned char *r;
register int i;
for(i=number,r= &scan[0][0];i>0;i--,r++,dp++)
{
*dp = fmaps[0][*r];
}
}
/* convert a colour line with map to 8 bits per pixel */
c_m_line(dp,number,line)
int number,line;
register unsigned char *dp;
{
register unsigned char *r, *g, *b;
register int i, col, row;
if(!bwflag)
{
for ( row = line % dith_size, col = x_min % dith_size, i = number, r = &scan[0][0]
,g= &scan[1][0], b= &scan[2][0];
i > 0; i--, r++, g++, b++, dp++, col = ((col + 1) % dith_size) )
{
*dp = DMAP(fmaps[0][*r], col, row) +
DMAP(fmaps[1][*g], col, row) * 6 +
DMAP(fmaps[2][*b], col, row) * 36;
}
}
else
{
int red,green,blue;
for (i = number, r= &scan[0][0], g= &scan[1][0]
,b= &scan[2][0]; i>0;i--,r++,g++,b++,dp++)
{
red = fmaps[0][*r];green=fmaps[1][*g];blue = fmaps[2][*b];
*dp = 0.35* red + 0.55* green + 0.1* blue;
}
}
}