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#ifndef lint
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static const char RCSid[] = "$Id: psketch.c,v 2.4 2018/08/02 18:33:46 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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#define MAXMOD 2048 /* maximum number of modifiers */
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#define USESORT 12 /* switch to sorted search */
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double smoothing = 0.8; /* weight for moving average filter */
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double mixfact = 0.3; /* amount to mix above/below */
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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; /* scanline bitmap */
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unsigned char *hasmod1;
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COLOR *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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#undef tstbit /* conflicting def's in param.h */
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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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const int spread = (int)(smoothing*10);
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int x, width = scanlen(&pres);
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unsigned char *tbmp;
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COLOR *tscn;
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char modbuf[516];
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/* advance buffer */
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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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/* set scanline bitmap */
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if (linesread) {
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/* load & check materials */
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memset(hasmod1, 0, bmwidth);
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for (x = 0; x < width; 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(hasmod1, x);
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}
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/* smear to cover around object */
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memset(hasmod, 0, bmwidth);
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for (x = spread; x < width-spread; x++) {
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int ox;
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if (!tstbit(hasmod1,x)) continue;
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for (ox = -spread; ox <= spread; ox++)
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setbit(hasmod,x+ox);
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}
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}
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/* read next picture scanline */
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if (freadscan(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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hasmod1 = (unsigned char *)malloc(bmwidth);
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scan[0] = (COLOR *)malloc(scanlen(&pres)*sizeof(COLOR));
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scan[1] = (COLOR *)malloc(scanlen(&pres)*sizeof(COLOR));
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if (!hasmod | !hasmod1 | !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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COLOR cmavg;
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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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}
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setcolor(cmavg, .0f, .0f, .0f); /* process this scanline */
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for (x = xstart; x != xstop; x += xstep) {
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COLOR cmix;
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if (!tstbit(hasmod,x)) continue;
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/* apply moving average */
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scalecolor(scan[0][x], 1.-smoothing);
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scalecolor(cmavg, smoothing);
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addcolor(cmavg, scan[0][x]);
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copycolor(scan[0][x], cmavg);
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/* mix pixel into next scanline */
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copycolor(cmix, scan[0][x]);
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scalecolor(cmix, mixfact);
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scalecolor(scan[1][x], 1.-mixfact);
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addcolor(scan[1][x], cmix);
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}
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/* write out result */
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if (fwritescan(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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}
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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(hasmod1);
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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[MAXFMTLEN];
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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);
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}
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nmods += rval;
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break;
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case 's': /* filter smoothing amount */
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smoothing = atof(argv[++i]);
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if ((smoothing <= FTINY) | (smoothing >= 1.-FTINY)) {
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fprintf(stderr, "%s: smoothing factor must be in (0,1) range\n",
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argv[0]);
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return(1);
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}
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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][-s smoothing] octree input.hdr [output.hdr]\n",
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argv[0]);
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return(1);
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}
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if (!nmods) {
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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);
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}
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octree = argv[i];
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infname = argv[i+1]; /* open input picture */
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infp = fopen(infname, "rb");
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if (infp == NULL) {
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fprintf(stderr, "%s: cannot open input '%s' for reading\n",
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argv[0], argv[i+1]);
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return(1);
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}
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if (i+2 < argc && /* open output picture */
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freopen(argv[i+2], "w", stdout) == NULL) {
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fprintf(stderr, "%s: cannot open output '%s' for writing\n",
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argv[0], argv[i+2]);
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return(1);
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}
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SET_FILE_BINARY(stdout);
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strcpy(pfmt, PICFMT); /* copy format/resolution */
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if (checkheader(infp, pfmt, stdout) < 0 || !fgetsresolu(&pres, infp)) {
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fprintf(stderr, "%s: bad format for input picture\n",
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argv[0]);
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return(1);
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}
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printargs(argc, argv, stdout); /* complete header */
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fputformat(pfmt, stdout);
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fputc('\n', stdout);
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fputsresolu(&pres, stdout); /* resolution does not change */
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if (!get_started())
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return(1);
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while ((rval = advance_scanline()))
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if (rval < 0)
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return(1);
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if (!clean_up())
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return(1);
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return(0);
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}
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