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LOADFILE.C
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1990-09-17
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/*
loadfile.c - load an existing fractal image, control level
This module is linked as an overlay, use ENTER_OVLY and EXIT_OVLY.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "fractint.h"
#include "fractype.h"
#include "targa_lc.h"
/* routines in this module */
void loadfile_overlay(void);
int read_overlay(void);
static int find_fractal_info(char *,struct fractal_info *);
static void load_ext_blk(char far *loadptr,int loadlen);
static void skip_ext_blk(int *,int *);
static void backwardscompat();
int filetype;
extern int showfile; /* has file been displayed yet? */
extern char readname[]; /* name of fractal input file */
extern char far *resume_info; /* pointer to resume info if alloc'd */
extern int resume_len; /* length of resume info */
extern int adapter;
extern int calc_status;
extern int initmode; /* initial video mode */
extern long calctime;
extern int initbatch; /* 1 if batch run (no kbd) */
extern int maxit;
extern int initincr; /* maxiter incrmnt */
extern char usr_stdcalcmode; /* pass mode */
extern int fractype; /* fractal type */
extern double xxmin,xxmax; /* corner values */
extern double yymin,yymax; /* corner values */
extern double xx3rd,yy3rd; /* corner values */
extern double param[4]; /* parameters */
extern int inside; /* inside color: 1=blue */
extern int outside; /* outside color, if set */
extern int finattract; /* finite attractor option */
extern int forcesymmetry;
extern int LogFlag; /* non-zero if logarithmic palettes */
extern int rflag, rseed;
extern int usr_periodicitycheck;
extern char useinitorbit;
extern struct complex initorbit;
extern int potflag; /* continuous potential flag */
extern int pot16bit;
extern double potparam[3]; /* three potential parameters*/
extern double inversion[];
extern int decomp[];
extern int usr_distest; /* non-zero if distance estimator */
extern int init3d[20]; /* '3d=nn/nn/nn/...' values */
extern char usr_floatflag; /* floating-point fractals? */
extern int biomorph;
extern char FormName[];
extern int bailout; /* user input bailout value */
extern int previewfactor;
extern int xtrans;
extern int ytrans;
extern int red_crop_left;
extern int red_crop_right;
extern int blue_crop_left;
extern int blue_crop_right;
extern int red_bright;
extern int blue_bright;
extern int xadjust;
extern int eyeseparation;
extern int glassestype;
extern int display3d; /* 3D display flag: 0 = OFF */
extern int overlay3d; /* 3D overlay flag: 0 = OFF */
extern int viewwindow; /* 0 for full screen, 1 for window */
extern float viewreduction; /* window auto-sizing */
extern float finalaspectratio; /* for view shape and rotation */
extern int viewxdots,viewydots; /* explicit view sizing */
extern int save_system,save_release;
static FILE *fp;
int fileydots, filexdots, filecolors;
float fileaspectratio;
int skipxdots,skipydots; /* for decoder, when reducing image */
void loadfile_overlay() { } /* for restore_active_ovly */
int read_overlay() /* read overlay/3D files, if reqr'd */
{
struct fractal_info read_info;
char oldfloatflag;
char msg[110];
ENTER_OVLY(OVLY_LOADFILE);
showfile = 1; /* for any abort exit, pretend done */
initmode = -1; /* no viewing mode set yet */
oldfloatflag = usr_floatflag;
if(find_fractal_info(readname,&read_info)) { /* didn't find a useable file */
sprintf(msg,"Sorry, %s isn't a file I can decode.",readname);
stopmsg(1,msg);
EXIT_OVLY;
return(-1);
}
maxit = read_info.iterations;
fractype = read_info.fractal_type;
xxmin = read_info.xmin;
xxmax = read_info.xmax;
yymin = read_info.ymin;
yymax = read_info.ymax;
param[0] = read_info.creal;
param[1] = read_info.cimag;
save_release = 1100; /* unless we find out better later on */
if(read_info.version > 0) {
param[2] = read_info.parm3;
param[3] = read_info.parm4;
potparam[0] = read_info.potential[0];
potparam[1] = read_info.potential[1];
potparam[2] = read_info.potential[2];
potflag = (potparam[0] != 0.0);
rflag = read_info.rflag;
rseed = read_info.rseed;
inside = read_info.inside;
LogFlag = read_info.logmap;
inversion[0] = read_info.invert[0];
inversion[1] = read_info.invert[1];
inversion[2] = read_info.invert[2];
decomp[0] = read_info.decomp[0];
decomp[1] = read_info.decomp[1];
biomorph = read_info.biomorph;
forcesymmetry = read_info.symmetry;
}
if(read_info.version > 1) {
save_release = 1200;
if (!display3d) {
int i;
for (i = 0; i < 16; i++)
init3d[i] = read_info.init3d[i];
previewfactor = read_info.previewfactor;
xtrans = read_info.xtrans;
ytrans = read_info.ytrans;
red_crop_left = read_info.red_crop_left;
red_crop_right = read_info.red_crop_right;
blue_crop_left = read_info.blue_crop_left;
blue_crop_right = read_info.blue_crop_right;
red_bright = read_info.red_bright;
blue_bright = read_info.blue_bright;
xadjust = read_info.xadjust;
eyeseparation = read_info.eyeseparation;
glassestype = read_info.glassestype;
}
}
if(read_info.version > 2) {
save_release = 1300;
outside = read_info.outside;
}
calc_status = 0; /* defaults if version < 4 */
xx3rd = xxmin;
yy3rd = yymin;
usr_distest = 0;
calctime = 0;
if(read_info.version > 3) {
save_release = 1400;
xx3rd = read_info.x3rd;
yy3rd = read_info.y3rd;
calc_status = read_info.calc_status;
usr_stdcalcmode = read_info.stdcalcmode;
usr_distest = read_info.distest;
usr_floatflag = read_info.floatflag;
bailout = read_info.bailout;
calctime = read_info.calctime;
trigndx[0] = read_info.trigndx[0];
trigndx[1] = read_info.trigndx[1];
trigndx[2] = read_info.trigndx[2];
trigndx[3] = read_info.trigndx[3];
finattract = read_info.finattract;
initorbit.x = read_info.initorbit[0];
initorbit.y = read_info.initorbit[1];
useinitorbit = read_info.useinitorbit;
usr_periodicitycheck = read_info.periodicity;
}
pot16bit = 0;
save_system = 0;
if(read_info.version > 4) {
pot16bit = read_info.pot16bit;
if (pot16bit)
filexdots >>= 1;
fileaspectratio = read_info.faspectratio;
if (fileaspectratio < 0.01) /* fix files produced in early v14.1 */
fileaspectratio = SCREENASPECT;
save_system = read_info.system;
save_release = read_info.release; /* from fmt 5 on we know real number */
if (read_info.version == 5 /* except a few early fmt 5 cases: */
&& (save_release <= 0 || save_release >= 2000)) {
save_release = 1410;
save_system = 0;
}
}
if(read_info.version < 4) { /* pre-version 14.0? */
backwardscompat(&read_info); /* translate obsolete types */
if(LogFlag)
LogFlag = 2;
usr_floatflag = (fractalspecific[fractype].isinteger) ? 0 : 1;
}
if(read_info.version < 5) { /* pre-version 15.0? */
if(LogFlag == 2) /* logmap=old changed again in format 5! */
LogFlag = -1;
}
fractalspecific[fractype].paramvalue[0] = param[0];
fractalspecific[fractype].paramvalue[1] = param[1];
fractalspecific[fractype].paramvalue[2] = param[2];
fractalspecific[fractype].paramvalue[3] = param[3];
set_trig_pointers(-1);
if (display3d) /* PB - a klooge till the meaning of */
usr_floatflag = oldfloatflag; /* floatflag in line3d is clarified */
if (overlay3d)
initmode = adapter; /* use previous adapter mode for overlays */
else
if (get_video_mode(&read_info)) {
EXIT_OVLY;
initmode = -1;
return(-1);