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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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|
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#include "copyright.h" |
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|
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#include <string.h> |
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|
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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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|
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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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|
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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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|
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char *modlist[MAXMOD]; /* (sorted) modifier list */ |
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int nmods = 0; /* number of modifiers */ |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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} |
