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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);
- }
-
- if (display3d) {
- calc_status = 0;
- fractype = PLASMA;
- param[0] = 0;
- if (!initbatch)
- if (get_3d_params() < 0) {
- EXIT_OVLY;
- initmode = -1;
- return(-1);
- }
- }
-
- showfile = 0; /* trigger the file load */
-
- EXIT_OVLY;
- return(0);
- }
-
-
- static int find_fractal_info(gif_file,info)
- char *gif_file;
- struct fractal_info *info;
- {
- unsigned char gifstart[18];
- char temp1[81];
- int scan_extend, block_type, block_len, data_len;
- int fractinf_len;
- int hdr_offset;
- int i;
-
- if((fp = fopen(gif_file,"rb"))==NULL)
- return(-1);
-
- fread(gifstart,18,1,fp);
- if (strncmp(gifstart,"GIF",3)!=0) { /* not GIF, maybe old .tga? */
- if(fread(info,sizeof(struct fractal_info),1,fp)==1 &&
- strncmp(info->info_id,"Fractal",8)==0) {
- filetype = 1; /* Targa 16 */
- fileydots = *(int *)&gifstart[O_VSIZE];
- filexdots = *(int *)&gifstart[O_HSIZE];
- filecolors = info->colors;
- fileaspectratio = SCREENASPECT;
- if(fileydots == info->ydots && filexdots == info->xdots) {
- fclose(fp);
- return(0);
- }
- }
- fclose(fp);
- return(-1);
- }
-
- filetype = 0; /* GIF */
- filexdots = gifstart[7]*256+gifstart[6];
- fileydots = gifstart[9]*256+gifstart[8];
- filecolors = 2 << (gifstart[10] & 7);
- fileaspectratio = 0; /* unknown */
- if (gifstart[12]) { /* calc reasonably close value from gif header */
- fileaspectratio = (64.0 / ((double)(gifstart[12]) + 15.0))
- * (double)fileydots / (double)filexdots;
- if ( fileaspectratio > SCREENASPECT-0.03
- && fileaspectratio < SCREENASPECT+0.03)
- fileaspectratio = SCREENASPECT;
- }
- else
- if (fileydots * 4 == filexdots * 3) /* assume the common square pixels */
- fileaspectratio = SCREENASPECT;
-
- if (resume_info != NULL) { /* free the prior area if there is one */
- farmemfree(resume_info);
- resume_info = NULL;
- }
-
- /* Format of .gif extension blocks is:
- 1 byte '!', extension block identifier
- 1 byte extension block number, 255
- 1 byte length of id, 11
- 11 bytes alpha id, "fractintnnn" with fractint, nnn is secondary id
- n * {
- 1 byte length of block info in bytes
- x bytes block info
- }
- 1 byte 0, extension terminator
- To scan extension blocks, we first look in file at length of fractal_info
- (the main extension block) from end of file, looking for a literal known
- to be at start of our block info. Then we scan forward a bit, in case
- the file is from an earlier fractint vsn with shorter fractal_info.
- If fractal_info is found and is from vsn>=14, it includes the total length
- of all extension blocks; we then scan them all first to last to load
- any optional ones which are present.
- Defined extension blocks:
- fractint001 header, always present
- fractint002 resume info for interrupted resumable image
- fractint003 additional formula type info
- */
-
- memset(info,0,sizeof(FRACTAL_INFO));
- fractinf_len = sizeof(FRACTAL_INFO) + (sizeof(FRACTAL_INFO)+254)/255;
- fseek(fp,(long)(-1-fractinf_len),SEEK_END);
- fread(info,1,sizeof(FRACTAL_INFO),fp);
- if (strcmp(INFO_ID,info->info_id) == 0)
- hdr_offset = -1-fractinf_len;
- else {
- /* didn't work 1st try, maybe an older vsn, maybe junk at eof, scan: */
- int offset,i;
- char tmpbuf[110];
- hdr_offset = 0;
- offset = 80; /* don't even check last 80 bytes of file for id */
- while (offset < fractinf_len+513) { /* allow 512 garbage at eof */
- offset += 100; /* go back 100 bytes at a time */
- fseek(fp,(long)(0-offset),SEEK_END);
- fread(tmpbuf,1,110,fp); /* read 10 extra for string compare */
- for (i = 0; i < 100; ++i)
- if (!strcmp(INFO_ID,&tmpbuf[i])) { /* found header? */
- strcpy(info->info_id,INFO_ID);
- fseek(fp,(long)(hdr_offset=i-offset),SEEK_END);
- fread(info,1,sizeof(FRACTAL_INFO),fp);
- offset = 10000; /* force exit from outer loop */
- break;
- }
- }
- }
-
- if (hdr_offset) { /* we found INFO_ID */
-
- if (info->version >= 4) {
- /* first reload main extension block, reasons:
- might be over 255 chars, and thus earlier load might be bad
- find exact endpoint, so scan back to start of ext blks works
- */
- fseek(fp,(long)(hdr_offset-15),SEEK_END);
- scan_extend = 1;
- while (scan_extend) {
- if (fgetc(fp) != '!' /* if not what we expect just give up */
- || fread(temp1,1,13,fp) != 13
- || strncmp(&temp1[2],"fractint",8))
- break;
- temp1[13] = 0;
- block_type = atoi(&temp1[10]); /* e.g. "fractint002" */
- switch (block_type) {
- case 1: /* "fractint001", the main extension block */
- if (scan_extend == 2) { /* we've been here before, done now */
- scan_extend = 0;
- break;
- }
- load_ext_blk((char far *)info,sizeof(FRACTAL_INFO));
- scan_extend = 2;
- /* now we know total extension len, back up to first block */
- fseek(fp,0L-info->tot_extend_len,SEEK_CUR);
- break;
- case 2: /* resume info */
- skip_ext_blk(&block_len,&data_len); /* once to get lengths */
- if ((resume_info = farmemalloc((long)data_len)) == NULL)
- info->calc_status = 3; /* not resumable after all */
- else {
- fseek(fp,(long)(0-block_len),SEEK_CUR);
- load_ext_blk(resume_info,data_len);
- resume_len = data_len;
- }
- break;
- case 3: /* formula info */
- load_ext_blk(FormName,40);
- /* perhaps in future add more here, check block_len for
- backward compatibility */
- break;
- default:
- skip_ext_blk(&block_len,&data_len);
- }
- }
- }
-
- fclose(fp);
- fileaspectratio = SCREENASPECT; /* if not >= v15, this is correct */
- return(0);
- }
-
- strcpy(info->info_id, "GIFFILE");
- info->iterations = 150;
- info->fractal_type = PLASMA;
- info->xmin = -1;
- info->xmax = 1;
- info->ymin = -1;
- info->ymax = 1;
- info->x3rd = -1;
- info->y3rd = -1;
- info->creal = 0;
- info->cimag = 0;
- info->videomodeax=255;
- info->videomodebx=255;
- info->videomodecx=255;
- info->videomodedx=255;
- info->dotmode = 0;
- info->xdots = filexdots;
- info->ydots = fileydots;
- info->colors = filecolors;
- info->version = 0; /* this forces lots more init at calling end too */
-
- /* zero means we won */
- fclose(fp);
- return(0);
- }
-
- static void load_ext_blk(char far *loadptr,int loadlen)
- {
- int len;
- while ((len = fgetc(fp)) > 0) {
- while (--len >= 0) {
- if (--loadlen >= 0)
- *(loadptr++) = fgetc(fp);
- else
- fgetc(fp); /* discard excess characters */
- }
- }
- }
-
- static void skip_ext_blk(int *block_len, int *data_len)
- {
- int len;
- *data_len = 0;
- *block_len = 1;
- while ((len = fgetc(fp)) > 0) {
- fseek(fp,(long)len,SEEK_CUR);
- *data_len += len;
- *block_len += len + 1;
- }
- }
-
-
- /* switch obsolete fractal types to new generalizations */
- static void backwardscompat(struct fractal_info *info)
- {
- switch(fractype) {
- case LAMBDASINE:
- fractype = LAMBDATRIGFP;
- trigndx[0] = SIN;
- break;
- case LAMBDACOS :
- fractype = LAMBDATRIGFP;
- trigndx[0] = COS;
- break;
- case LAMBDAEXP :
- fractype = LAMBDATRIGFP;
- trigndx[0] = EXP;
- break;
- case MANDELSINE :
- fractype = MANDELTRIGFP;
- trigndx[0] = SIN;
- break;
- case MANDELCOS :
- fractype = MANDELTRIGFP;
- trigndx[0] = COS;
- break;
- case MANDELEXP :
- fractype = MANDELTRIGFP;
- trigndx[0] = EXP;
- break;
- case MANDELSINH :
- fractype = MANDELTRIGFP;
- trigndx[0] = SINH;
- break;
- case LAMBDASINH :
- fractype = LAMBDATRIGFP;
- trigndx[0] = SINH;
- break;
- case MANDELCOSH :
- fractype = MANDELTRIGFP;
- trigndx[0] = COSH;
- break;
- case LAMBDACOSH :
- fractype = LAMBDATRIGFP;
- trigndx[0] = COSH;
- break;
- case LMANDELSINE :
- fractype = MANDELTRIG;
- trigndx[0] = SIN;
- break;
- case LLAMBDASINE :
- fractype = LAMBDATRIG;
- trigndx[0] = SIN;
- break;
- case LMANDELCOS :
- fractype = MANDELTRIG;
- trigndx[0] = COS;
- break;
- case LLAMBDACOS :
- fractype = LAMBDATRIG;
- trigndx[0] = COS;
- break;
- case LMANDELSINH :
- fractype = MANDELTRIG;
- trigndx[0] = SINH;
- break;
- case LLAMBDASINH :
- fractype = LAMBDATRIG;
- trigndx[0] = SINH;
- break;
- case LMANDELCOSH :
- fractype = MANDELTRIG;
- trigndx[0] = COSH;
- break;
- case LLAMBDACOSH :
- fractype = LAMBDATRIG;
- trigndx[0] = COSH;
- break;
- case LMANDELEXP :
- fractype = MANDELTRIG;
- trigndx[0] = EXP;
- break;
- case LLAMBDAEXP :
- fractype = LAMBDATRIG;
- trigndx[0] = EXP;
- break;
- case DEMM :
- fractype = MANDELFP;
- usr_distest = (info->ydots - 1) * 2;
- break;
- case DEMJ :
- fractype = JULIAFP;
- usr_distest = (info->ydots - 1) * 2;
- break;
- case MANDELLAMBDA :
- useinitorbit = 2;
- break;
- }
- }
-