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greg |
2.1 |
#ifndef lint |
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static const char RCSid[] = "$Id: psign.c,v 2.27 2011/05/20 02:06:39 greg Exp $"; |
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#endif |
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/* |
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* psketch.c - modify picture to sketch objects with named modifiers |
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* |
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* 9/23/2017 |
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*/ |
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#include "copyright.h" |
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#include <string.h> |
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#include "standard.h" |
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#include "platform.h" |
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#include "resolu.h" |
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#include "color.h" |
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#include "random.h" |
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/* our probabilities */ |
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#define PROB_LEFT1 0.1 |
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#define PROB_RIGHT1 0.1 |
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#define PROB_LEFT2 0.2 |
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#define PROB_RIGHT2 0.2 |
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#define PROB_LEFT3 0.07 |
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#define PROB_RIGHT3 0.07 |
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#define PROB_DOWN1 0.1 |
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#define MAXMOD 2048 /* maximum number of modifiers */ |
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#define USESORT 12 /* switch to sorted search */ |
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char *modlist[MAXMOD]; /* (sorted) modifier list */ |
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int nmods = 0; /* number of modifiers */ |
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unsigned char *hasmod, *moved[2]; /* scanline bitmaps */ |
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COLR *scan[2]; /* i/o scanlines */ |
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RESOLU pres; /* input resolution */ |
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int bmwidth; /* bytes per bitmap */ |
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/* conflicting def's in param.h */ |
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#undef tstbit |
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#undef setbit |
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#undef clrbit |
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#undef tglbit |
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#define bitop(bm,x,op) ((bm)[(x)>>3] op (1<<((x)&7))) |
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#define tstbit(bm,x) bitop(bm,x,&) |
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#define setbit(bm,x) bitop(bm,x,|=) |
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#define clrbit(bm,x) bitop(bm,x,&=~) |
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#define tglbit(bm,x) bitop(bm,x,^=) |
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const char *octree, *infname; /* input octree and picture names */ |
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FILE *infp; /* picture input stream */ |
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FILE *mafp; /* pipe from rtrace with modifiers */ |
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int linesread = 0; /* scanlines read so far */ |
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static int |
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find_mod(const char *s) |
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{ |
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int ilower, iupper; |
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int c, i; |
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if (nmods < USESORT) { /* linear search */ |
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for (i = nmods; i-- > 0; ) |
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if (!strcmp(s, modlist[i])) |
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return(i); |
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return(-1); |
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} |
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ilower = 0; iupper = nmods; |
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c = iupper; /* binary search */ |
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while ((i = (iupper + ilower) >> 1) != c) { |
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c = strcmp(s, modlist[i]); |
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if (c > 0) |
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ilower = i; |
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else if (c < 0) |
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iupper = i; |
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else |
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return(i); |
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c = i; |
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} |
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return(-1); |
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} |
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static int |
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read_scan(void) |
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{ |
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int x, width = scanlen(&pres); |
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unsigned char *tbmp; |
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COLR *tscn; |
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char modbuf[516]; |
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/* advance buffers */ |
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tbmp = moved[0]; |
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moved[0] = moved[1]; |
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moved[1] = tbmp; |
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tscn = scan[0]; |
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scan[0] = scan[1]; |
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scan[1] = tscn; |
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/* check if we are at the end */ |
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if (linesread >= numscans(&pres)) |
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return(0); |
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/* clear bitmaps */ |
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if (linesread) |
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memset(hasmod, 0, bmwidth); |
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memset(moved[1], 0, bmwidth); |
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/* load & check materials */ |
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for (x = 0; x < width*(linesread>0); x++) { |
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int len; |
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if (fgets(modbuf, sizeof(modbuf), mafp) == NULL) { |
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fprintf(stderr, "Error reading from rtrace!\n"); |
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return(-1); |
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} |
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len = strlen(modbuf); |
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if (len < 3 || (modbuf[len-1] != '\n') | |
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(modbuf[len-2] != '\t')) { |
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fprintf(stderr, "Garbled rtrace output: %s", modbuf); |
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return(-1); |
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} |
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modbuf[len-2] = '\0'; |
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if (find_mod(modbuf) >= 0) |
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setbit(hasmod, x); |
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} |
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/* read next picture scanline */ |
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if (freadcolrs(scan[1], width, infp) < 0) { |
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fprintf(stderr, "%s: error reading scanline %d\n", |
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infname, linesread); |
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return(-1); |
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} |
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return(++linesread); |
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} |
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static int |
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spcmp(const void *p1, const void *p2) |
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{ |
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return strcmp(*(const char **)p1, *(const char **)p2); |
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} |
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static int |
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get_started(void) |
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{ |
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char combuf[1024]; |
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if (nmods >= USESORT) /* need to sort for search? */ |
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qsort(modlist, nmods, sizeof(char *), &spcmp); |
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/* open pipe from rtrace */ |
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sprintf(combuf, "vwrays -fd %s | rtrace -h -fda -om %s", |
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infname, octree); |
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mafp = popen(combuf, "r"); |
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if (mafp == NULL) { |
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perror("popen"); |
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return(0); |
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} |
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/* allocate bitmaps & buffers */ |
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bmwidth = (scanlen(&pres)+7) >> 3; |
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hasmod = (unsigned char *)malloc(bmwidth); |
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moved[0] = (unsigned char *)malloc(bmwidth); |
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moved[1] = (unsigned char *)malloc(bmwidth); |
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scan[0] = (COLR *)malloc(scanlen(&pres)*sizeof(COLR)); |
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scan[1] = (COLR *)malloc(scanlen(&pres)*sizeof(COLR)); |
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if (!hasmod | !moved[0] | !moved[1] | !scan[0] | !scan[1]) { |
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perror("malloc"); |
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return(0); |
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} |
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if (!read_scan()) /* read first scanline */ |
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return(0); |
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return(1); |
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} |
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static int |
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advance_scanline(void) |
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{ |
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static int alldone = 0; |
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int width = scanlen(&pres); |
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int height = numscans(&pres); |
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int x, xstart = 0, xstop = width, xstep = 1; |
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COLR tclr; |
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#define CSWAP(y0,x0,y1,x1) { copycolr(tclr,scan[y0][x0]); \ |
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copycolr(scan[y1][x1],scan[y0][x0]); \ |
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copycolr(scan[y0][x0],tclr); \ |
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setbit(moved[y0],x0); setbit(moved[y1],x1); } |
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if (alldone) /* finished last scanline? */ |
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return(0); |
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alldone = (linesread >= height); |
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/* advance scanline */ |
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if (read_scan() < !alldone) |
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return(-1); |
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if (linesread & 1) { /* process in horizontal zig-zag */ |
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xstart = width-1; |
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xstop = -1; |
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xstep = -1; |
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} /* process this scanline */ |
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for (x = xstart; x != xstop; x += xstep) { |
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double runif = frandom(); |
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if (tstbit(moved[0],x) || !tstbit(hasmod,x)) |
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continue; |
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if (runif < PROB_LEFT1) { |
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if (x > 0 && !tstbit(moved[0],x-1)) |
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CSWAP(0,x,0,x-1); |
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continue; |
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} |
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runif -= PROB_LEFT1; |
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if (runif < PROB_RIGHT1) { |
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if (x < width-1 && !tstbit(moved[0],x+1)) |
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CSWAP(0,x,0,x+1); |
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continue; |
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} |
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runif -= PROB_RIGHT1; |
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if (runif < PROB_LEFT2) { |
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if (x > 1 && !tstbit(moved[0],x-2)) |
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CSWAP(0,x,0,x-2); |
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continue; |
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} |
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runif -= PROB_LEFT2; |
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if (runif < PROB_RIGHT2) { |
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if (x < width-2 && !tstbit(moved[0],x+2)) |
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CSWAP(0,x,0,x+2); |
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continue; |
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} |
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runif -= PROB_RIGHT2; |
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if (runif < PROB_LEFT3) { |
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if (x > 2 && !tstbit(moved[0],x-3)) |
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CSWAP(0,x,0,x-3); |
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continue; |
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} |
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runif -= PROB_LEFT3; |
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if (runif < PROB_RIGHT3) { |
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if (x < width-3 && !tstbit(moved[0],x+3)) |
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CSWAP(0,x,0,x+3); |
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continue; |
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} |
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runif -= PROB_RIGHT3; |
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if (runif < PROB_DOWN1) { |
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if (linesread < height-1) |
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CSWAP(0,x,1,x); |
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continue; |
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} |
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runif -= PROB_DOWN1; |
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} |
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/* write it out */ |
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if (fwritecolrs(scan[0], width, stdout) < 0) { |
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perror("write error"); |
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return(-1); |
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} |
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return(1); |
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#undef CSWAP |
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} |
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static int |
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clean_up(void) |
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{ |
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char linebuf[128]; |
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/* read unused materials */ |
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while (fgets(linebuf, sizeof(linebuf), mafp) != NULL) |
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; |
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if (pclose(mafp) != 0) { |
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fprintf(stderr, "Error running rtrace!\n"); |
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return(0); |
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} |
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fclose(infp); |
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free(hasmod); |
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free(moved[0]); |
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free(moved[1]); |
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free(scan[0]); |
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free(scan[1]); |
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return(1); |
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} |
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int |
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main(int argc, char *argv[]) |
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{ |
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int i, rval; |
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char pfmt[LPICFMT+1]; |
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/* process options */ |
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for (i = 1; i < argc && argv[i][0] == '-'; i++) |
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switch (argv[i][1]) { |
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case 'm': /* new modifier name */ |
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if (nmods >= MAXMOD) { |
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fprintf(stderr, "%s: too many modifiers\n", argv[0]); |
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return(1); |
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} |
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modlist[nmods++] = argv[++i]; |
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break; |
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case 'M': /* modifier file */ |
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rval = wordfile(modlist, MAXMOD-nmods, argv[++i]); |
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if (rval < 0) { |
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fprintf(stderr, "%s: cannot open modifier file '%s'\n", |
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argv[0], argv[i]); |
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return(1); |
| 288 |
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} |
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nmods += rval; |
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break; |
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default: |
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fprintf(stderr, "%s: unknown option '%s'\n", |
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argv[0], argv[i]); |
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return(1); |
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} |
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if ((argc-i < 2) | (argc-i > 3)) { |
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fprintf(stderr, "Usage: %s [-m modname][-M modfile] octree input.hdr [output.hdr]\n", |
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argv[0]); |
| 299 |
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return(1); |
| 300 |
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} |
| 301 |
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if (!nmods) { |
| 302 |
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fprintf(stderr, "%s: at least one '-m' or '-M' option needed\n", |
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argv[0]); |
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return(1); |
| 305 |
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} |
| 306 |
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octree = argv[i]; |
| 307 |
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infname = argv[i+1]; /* open input picture */ |
| 308 |
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infp = fopen(infname, "rb"); |
| 309 |
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if (infp == NULL) { |
| 310 |
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fprintf(stderr, "%s: cannot open input '%s' for reading\n", |
| 311 |
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argv[0], argv[i+1]); |
| 312 |
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return(1); |
| 313 |
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} |
| 314 |
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if (i+2 < argc && /* open output picture */ |
| 315 |
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freopen(argv[i+2], "w", stdout) == NULL) { |
| 316 |
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fprintf(stderr, "%s: cannot open output '%s' for writing\n", |
| 317 |
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argv[0], argv[i+2]); |
| 318 |
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return(1); |
| 319 |
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} |
| 320 |
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SET_FILE_BINARY(stdout); |
| 321 |
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strcpy(pfmt, PICFMT); /* copy format/resolution */ |
| 322 |
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if (checkheader(infp, pfmt, stdout) < 0 || !fgetsresolu(&pres, infp)) { |
| 323 |
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fprintf(stderr, "%s: bad format for input picture\n", |
| 324 |
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argv[0]); |
| 325 |
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return(1); |
| 326 |
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} |
| 327 |
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printargs(argc, argv, stdout); /* complete header */ |
| 328 |
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fputformat(pfmt, stdout); |
| 329 |
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fputc('\n', stdout); |
| 330 |
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fputsresolu(&pres, stdout); /* resolution does not change */ |
| 331 |
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if (!get_started()) |
| 332 |
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return(1); |
| 333 |
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while ((rval = advance_scanline())) |
| 334 |
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if (rval < 0) |
| 335 |
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return(1); |
| 336 |
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if (!clean_up()) |
| 337 |
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return(1); |
| 338 |
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return(0); |
| 339 |
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} |
