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- #define LIBQTOOLS_CORE
- #include "../include/libqtools.h"
-
- /* ilbmtoppm.c - read an IFF ILBM file and produce a portable pixmap
- *
- * Copyright (C) 1989 by Jef Poskanzer.
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted, provided
- * that the above copyright notice appear in all copies and that both that
- * copyright notice and this permission notice appear in supporting
- * documentation. This software is provided "as is" without express or
- * implied warranty.
- *
- * Modified by Mark Thompson on 10/4/90 to accomodate 24 bit IFF files
- * as used by ASDG, NewTek, etc.
- *
- * Modified by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
- * 20/Jun/93:
- * - row-by-row operation
- * - better de-interleave algorithm
- * - colormap files
- * - direct color
- * 04/Oct/93:
- * - multipalette support (PCHG chunk)
- * - options -ignore, -isham, -isehb and -adjustcolors
- */
-
- /* prototypes */
- static void getfourchars ARGS((FILE * f, char fourchars[4]));
- static unsigned char get_byte ARGS((FILE * f));
- static long get_big_long ARGS((FILE * f));
- static short get_big_short ARGS((FILE * f));
- static void readerr ARGS((FILE * f));
-
- static void skip_chunk ARGS((FILE * f, long chunksize));
- static void display_chunk ARGS((FILE * ifp, char *iffid, long chunksize));
- static pixel *read_colormap ARGS((FILE * f, long colors));
- static BitMapHeader *read_bmhd ARGS((FILE * f));
- static PCHGInfo *read_pchg ARGS((FILE * ifp, unsigned long chunksize));
-
- static void ham_to_ppm ARGS((FILE * ifp, BitMapHeader * bmhd, pixel * colormap, int colors, PCHGInfo * pchginfo));
- static void deep_to_ppm ARGS((FILE * ifp, BitMapHeader * bmhd));
- static void cmap_to_ppm ARGS((pixel * colormap, int colors));
- static void std_to_ppm ARGS((FILE * ifp, BitMapHeader * bmhd, pixel * colormap, int colors, PCHGInfo * pchginfo, long viewportmodes));
- static void direct_to_ppm ARGS((FILE * ifp, BitMapHeader * bmhd, DirectColor * dcol));
-
- static void init_pchg ARGS((PCHGInfo * pchginfo, pixel * colormap, int colors, pixval newmaxval));
- static void adjust_colormap ARGS((PCHGInfo * pchginfo, int row));
- static void scale_colormap ARGS((pixel * colormap, int colors, pixval oldmaxval, pixval newmaxval));
- static pixel *ehb_to_cmap ARGS((pixel * colormap, int *colors));
- static void read_ilbm_plane ARGS((FILE * ifp, int cols, int compression));
- static void decode_row ARGS((FILE * ifp, rawtype * chunkyrow, int planes, BitMapHeader * bmhd));
-
- static rawtype *alloc_rawrow ARGS((int cols));
- static void *xmalloc ARGS((int bytes));
-
- #define MALLOC(n, type) (type *)tmalloc((n) * sizeof(type))
-
- static short verbose = 0;
- static short adjustcolors = 0;
- static unsigned char *ilbmrow;
- static pixel *pixelrow;
-
- struct rawpic *LoadILBM(HANDLE ilbmFile, int flags, int ignore)
- {
- FILE *ifp;
- pixel *colormap = 0;
- int argn, colors;
- char iffid[5];
- short body = 0;
- long formsize, bytesread, chunksize, viewportmodes = 0, fakeviewport = 0;
- char *usage = "[-verbose] [-ignore <chunkID>] [-isham|-isehb] [-adjustcolors] [ilbmfile]";
- BitMapHeader *bmhd = NULL;
- DirectColor *dcol = NULL;
- PCHGInfo *pchginfo = NULL;
-
- #define MAX_IGNORE 16
- char *ignorelist[MAX_IGNORE];
- int ignorecount = 0;
-
- ppm_init(&argc, argv);
-
- argn = 1;
- while (argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0') {
- if (pm_keymatch(argv[argn], "-verbose", 2))
- verbose = 1;
- else if (pm_keymatch(argv[argn], "-noverbose", 4))
- verbose = 0;
- else if (pm_keymatch(argv[argn], "-isham", 4))
- fakeviewport |= vmHAM;
- else if (pm_keymatch(argv[argn], "-isehb", 4))
- fakeviewport |= vmEXTRA_HALFBRITE;
- else if (pm_keymatch(argv[argn], "-adjustcolors", 2))
- adjustcolors = 1;
- else if (pm_keymatch(argv[argn], "-noadjustcolors", 4))
- adjustcolors = 0;
- else if (pm_keymatch(argv[argn], "-ignore", 2)) {
- if (++argn >= argc)
- pm_usage(usage);
- if (strlen(argv[argn]) != 4)
- pm_error("\"-ignore\" option needs a 4 byte chunk ID string as argument");
- if (ignorecount >= MAX_IGNORE)
- pm_error("max %d chunk IDs to ignore", MAX_IGNORE);
- ignorelist[ignorecount++] = argv[argn];
- }
- else
- pm_usage(usage);
- ++argn;
- }
-
- if (argn < argc) {
- ifp = pm_openr(argv[argn]);
- argn++;
- }
- else
- ifp = stdin;
-
- if (argn != argc)
- pm_usage(usage);
-
- /* Read in the ILBM file. */
- iffid[4] = '\0';
- getfourchars(ifp, iffid);
- if (strcmp(iffid, "FORM") != 0)
- pm_error("input is not a FORM type IFF file");
- formsize = get_big_long(ifp);
- getfourchars(ifp, iffid);
- if (strcmp(iffid, "ILBM") != 0)
- pm_error("input is not an ILBM type FORM IFF file");
- bytesread = 4; /* FORM and formsize do not count */
-
- /* Main loop, parsing the IFF FORM. */
- while (bytesread < formsize) {
- short i, ignore = 0;
-
- getfourchars(ifp, iffid);
- chunksize = get_big_long(ifp);
- bytesread += 8;
-
- for (i = 0; i < ignorecount && !ignore; i++) {
- if (strcmp(ignorelist[i], iffid) == 0)
- ignore = 1;
- }
-
- if (ignore) {
- ignore = 0;
- pm_message("ignoring \"%s\" chunk", iffid);
- skip_chunk(ifp, chunksize);
- }
- else if (body != 0) {
- pm_message("\"%s\" chunk found after BODY chunk - skipping", iffid);
- skip_chunk(ifp, chunksize);
- }
- else if (strcmp(iffid, "BMHD") == 0) {
- if (chunksize != BitMapHeaderSize)
- pm_error("BMHD chunk size mismatch");
- bmhd = read_bmhd(ifp);
- }
- else if (strcmp(iffid, "CMAP") == 0) {
- colors = chunksize / 3;
- if (colors == 0) {
- pm_error("warning - empty colormap");
- skip_chunk(ifp, chunksize);
- }
- else {
- long r = 3 * colors;
-
- colormap = read_colormap(ifp, colors);
- while (r++ < chunksize)
- (void)get_byte(ifp);
- }
- }
- else if (strcmp(iffid, "CAMG") == 0) {
- if (chunksize != CAMGChunkSize)
- pm_error("CAMG chunk size mismatch");
- viewportmodes = get_big_long(ifp);
- }
- else if (strcmp(iffid, "DCOL") == 0) {
- if (chunksize != DirectColorSize)
- pm_error("DCOL chunk size mismatch");
- dcol = MALLOC(1, DirectColor);
- dcol->r = get_byte(ifp);
- dcol->g = get_byte(ifp);
- dcol->b = get_byte(ifp);
- (void)get_byte(ifp);
- }
- else if (strcmp(iffid, "PCHG") == 0) {
- pchginfo = read_pchg(ifp, chunksize);
- }
- else if (strcmp(iffid, "BODY") == 0) {
- if (bmhd == NULL)
- pm_error("\"BODY\" chunk without \"BMHD\" chunk");
-
- ilbmrow = MALLOC(RowBytes(bmhd->w), unsigned char);
-
- pixelrow = ppm_allocrow(bmhd->w);
-
- viewportmodes |= fakeviewport;
-
- if (viewportmodes & vmHAM)
- ham_to_ppm(ifp, bmhd, colormap, colors, pchginfo);
- else if (dcol != NULL)
- direct_to_ppm(ifp, bmhd, dcol);
- else if (bmhd->nPlanes == 24)
- deep_to_ppm(ifp, bmhd);
- else
- std_to_ppm(ifp, bmhd, colormap, colors, pchginfo, viewportmodes);
- body = 1;
- }
- else if (strcmp(iffid, "GRAB") == 0 || strcmp(iffid, "DEST") == 0 ||
- strcmp(iffid, "SPRT") == 0 || strcmp(iffid, "CRNG") == 0 ||
- strcmp(iffid, "CCRT") == 0 || strcmp(iffid, "CLUT") == 0 ||
- strcmp(iffid, "DPPV") == 0 || strcmp(iffid, "DRNG") == 0 ||
- strcmp(iffid, "EPSF") == 0) {
- skip_chunk(ifp, chunksize);
- }
- else if (strcmp(iffid, "(c) ") == 0 || strcmp(iffid, "AUTH") == 0 ||
- strcmp(iffid, "NAME") == 0 || strcmp(iffid, "ANNO") == 0 ||
- strcmp(iffid, "TEXT") == 0) {
- if (verbose)
- display_chunk(ifp, iffid, chunksize);
- else
- skip_chunk(ifp, chunksize);
- }
- else if (strcmp(iffid, "DPI ") == 0) {
- int x, y;
-
- x = get_big_short(ifp);
- y = get_big_short(ifp);
- if (verbose)
- pm_message("\"DPI \" chunk: dpi_x = %d dpi_y = %d", x, y);
- }
- else {
- pm_message("unknown chunk type \"%s\" - skipping", iffid);
- skip_chunk(ifp, chunksize);
- }
-
- bytesread += chunksize;
- if (odd(chunksize)) {
- (void)get_byte(ifp);
- ++bytesread;
- }
- }
- pm_close(ifp);
-
- if (body == 0) {
- if (colormap)
- cmap_to_ppm(colormap, colors);
- else
- pm_error("no \"BODY\" or \"CMAP\" chunk found");
- }
-
- if (bytesread != formsize) {
- pm_message("warning - file length (%ld bytes) does not match FORM size field (%ld bytes) +8",
- bytesread, formsize);
- }
-
- exit(0);
- }
-
- static void readerr(f)
- FILE *f;
- {
- if (ferror(f))
- pm_error("read error");
- else
- pm_error("premature EOF");
- }
-
- static unsigned char get_byte(ifp)
- FILE *ifp;
- {
- int i;
-
- i = getc(ifp);
- if (i == EOF)
- readerr(ifp);
-
- return (unsigned char)i;
- }
-
- static void getfourchars(ifp, fourchars)
- FILE *ifp;
- char fourchars[4];
- {
- fourchars[0] = get_byte(ifp);
- fourchars[1] = get_byte(ifp);
- fourchars[2] = get_byte(ifp);
- fourchars[3] = get_byte(ifp);
- }
-
- static long get_big_long(ifp)
- FILE *ifp;
- {
- long l;
-
- if (pm_readbiglong(ifp, &l) == -1)
- readerr(ifp);
-
- return l;
- }
-
- static short get_big_short(ifp)
- FILE *ifp;
- {
- short s;
-
- if (pm_readbigshort(ifp, &s) == -1)
- readerr(ifp);
-
- return s;
- }
-
- static void skip_chunk(ifp, chunksize)
- FILE *ifp;
- long chunksize;
- {
- int i;
-
- for (i = 0; i < chunksize; i++)
- (void)get_byte(ifp);
- }
-
- static pixel *
- read_colormap(ifp, colors)
- FILE *ifp;
- long colors;
- {
- pixel *colormap;
- int i, r, g, b;
- pixval colmaxval = 0;
-
- colormap = ppm_allocrow(colors);
- for (i = 0; i < colors; i++) {
- r = get_byte(ifp);
- if (r > colmaxval)
- colmaxval = r;
- g = get_byte(ifp);
- if (g > colmaxval)
- colmaxval = g;
- b = get_byte(ifp);
- if (b > colmaxval)
- colmaxval = b;
- PPM_ASSIGN(colormap[i], r, g, b);
- }
- #ifdef DEBUG
- pm_message("colormap maxval is %d", colmaxval);
- #endif
- if (colmaxval == 0)
- pm_message("warning - black colormap");
- else if (colmaxval <= 15) {
- if (!adjustcolors) {
- pm_message("warning - probably 4 bit colormap");
- pm_message("use \"-adjustcolors\" to scale colormap to 8 bits");
- }
- else {
- pm_message("scaling colormap to 8 bits");
- scale_colormap(colormap, colors, 15, MAXCOLVAL);
- }
- }
- return colormap;
- }
-
- static BitMapHeader *
- read_bmhd(ifp)
- FILE *ifp;
- {
- BitMapHeader *bmhd;
-
- bmhd = MALLOC(1, BitMapHeader);
-
- bmhd->w = get_big_short(ifp); /* cols */
- bmhd->h = get_big_short(ifp); /* rows */
- bmhd->x = get_big_short(ifp);
- bmhd->y = get_big_short(ifp);
- bmhd->nPlanes = get_byte(ifp);
- bmhd->masking = get_byte(ifp);
- bmhd->compression = get_byte(ifp);
- bmhd->pad1 = get_byte(ifp); /* (ignored) */
- bmhd->transparentColor = get_big_short(ifp);
- bmhd->xAspect = get_byte(ifp);
- bmhd->yAspect = get_byte(ifp);
- bmhd->pageWidth = get_big_short(ifp);
- bmhd->pageHeight = get_big_short(ifp);
-
- if (verbose) {
- pm_message("dimensions: %dx%d", bmhd->w, bmhd->h);
- pm_message("BODY compression: %s", bmhd->compression <= cmpMAXKNOWN ?
- cmpNAME[bmhd->compression] : "unknown");
- }
-
- /* fix aspect ratio */
- if (bmhd->xAspect == 0) {
- if (bmhd->yAspect == 0) {
- pm_message("warning - xAspect:yAspect = 0:0, using 1:1");
- bmhd->xAspect = bmhd->yAspect = 1;
- }
- else {
- pm_message("warning - xAspect = 0, setting to yAspect");
- bmhd->xAspect = bmhd->yAspect;
- }
- }
- else {
- if (bmhd->yAspect == 0) {
- pm_message("warning - yAspect = 0, setting to xAspect");
- bmhd->yAspect = bmhd->xAspect;
- }
- }
- if (bmhd->xAspect != bmhd->yAspect) {
- pm_message("warning - non-square pixels; to fix do a 'pnmscale -%cscale %g'",
- bmhd->xAspect > bmhd->yAspect ? 'x' : 'y',
- bmhd->xAspect > bmhd->yAspect ? (float)(bmhd->xAspect) / bmhd->yAspect : (float)(bmhd->yAspect) / bmhd->xAspect);
- }
-
- return bmhd;
- }
-
- static void ham_to_ppm(ifp, bmhd, colormap, colors, pchginfo)
- FILE *ifp;
- BitMapHeader *bmhd;
- pixel *colormap;
- int colors;
- PCHGInfo *pchginfo;
- {
- int cols, rows, hambits, hammask, col, row;
- pixval maxval;
- rawtype *rawrow;
- int pchgflag = (pchginfo && colormap);
-
- cols = bmhd->w;
- rows = bmhd->h;
- hambits = bmhd->nPlanes - 2;
- hammask = (1 << hambits) - 1;
-
- pm_message("input is a %sHAM%d file", pchgflag ? "multipalette " : "", bmhd->nPlanes);
-
- if (hambits > MAXPLANES)
- pm_error("too many planes (max %d)", MAXPLANES);
- if (hambits < 0) {
- pm_message("HAM requires 2 or more planes");
- pm_error("try \"-ignore CAMG\" to treat this file as a normal ILBM");
- }
-
- maxval = pm_bitstomaxval(hambits);
- if (maxval > PPM_MAXMAXVAL)
- pm_error("nPlanes is too large - try reconfiguring with PGM_BIGGRAYS\n or without PPM_PACKCOLORS");
-
- /* scale colormap to new maxval */
- if (colormap && maxval != MAXCOLVAL)
- scale_colormap(colormap, colors, MAXCOLVAL, maxval);
-
- if (pchgflag)
- init_pchg(pchginfo, colormap, colors, maxval);
-
- rawrow = alloc_rawrow(cols);
-
- ppm_writeppminit(stdout, cols, rows, maxval, 0);
- for (row = 0; row < rows; row++) {
- pixval r, g, b;
-
- if (pchgflag)
- adjust_colormap(pchginfo, row);
-
- decode_row(ifp, rawrow, bmhd->nPlanes, bmhd);
-
- r = g = b = 0;
- for (col = 0; col < cols; col++) {
- switch ((rawrow[col] >> hambits) & 0x03) {
- case HAMCODE_CMAP:
- if (colormap && colors >= maxval)
- pixelrow[col] = colormap[rawrow[col] & hammask];
- else
- PPM_ASSIGN(pixelrow[col], rawrow[col] & hammask,
- rawrow[col] & hammask, rawrow[col] & hammask);
- r = PPM_GETR(pixelrow[col]);
- g = PPM_GETG(pixelrow[col]);
- b = PPM_GETB(pixelrow[col]);
- break;
- case HAMCODE_BLUE:
- b = rawrow[col] & hammask;
- PPM_ASSIGN(pixelrow[col], r, g, b);
- break;
- case HAMCODE_RED:
- r = rawrow[col] & hammask;
- PPM_ASSIGN(pixelrow[col], r, g, b);
- break;
- case HAMCODE_GREEN:
- g = rawrow[col] & hammask;
- PPM_ASSIGN(pixelrow[col], r, g, b);
- break;
- default:
- pm_error("impossible HAM code");
- }
- }
- ppm_writeppmrow(stdout, pixelrow, cols, (pixval) maxval, 0);
- }
- }
-
- static void deep_to_ppm(ifp, bmhd)
- FILE *ifp;
- BitMapHeader *bmhd;
- {
- int cols, rows, col, row;
- rawtype *Rrow, *Grow, *Brow;
-
- cols = bmhd->w;
- rows = bmhd->h;
-
- pm_message("input is a deep (24bit) ILBM");
-
- Rrow = alloc_rawrow(cols);
- Grow = alloc_rawrow(cols);
- Brow = alloc_rawrow(cols);
-
- ppm_writeppminit(stdout, cols, rows, MAXCOLVAL, 0);
- for (row = 0; row < rows; row++) {
- decode_row(ifp, Rrow, 8, bmhd);
- decode_row(ifp, Grow, 8, bmhd);
- decode_row(ifp, Brow, 8, bmhd);
- for (col = 0; col < cols; col++)
- PPM_ASSIGN(pixelrow[col], Rrow[col], Grow[col], Brow[col]);
- ppm_writeppmrow(stdout, pixelrow, cols, MAXCOLVAL, 0);
- }
- pm_close(stdout);
- }
-
- static void direct_to_ppm(ifp, bmhd, dcol)
- FILE *ifp;
- BitMapHeader *bmhd;
- DirectColor *dcol;
- {
- int cols, rows, col, row, redplanes, greenplanes, blueplanes;
- rawtype *Rrow, *Grow, *Brow;
- pixval maxval, redmaxval, greenmaxval, bluemaxval;
- int scale;
-
- cols = bmhd->w;
- rows = bmhd->h;
-
- redplanes = dcol->r;
- greenplanes = dcol->g;
- blueplanes = dcol->b;
-
- pm_message("input is a %d:%d:%d direct color ILBM",
- redplanes, greenplanes, blueplanes);
-
- if (redplanes > MAXPLANES || blueplanes > MAXPLANES || greenplanes > MAXPLANES)
- pm_error("too many planes (max %d per color)", MAXPLANES);
-
- if (bmhd->nPlanes != (redplanes + greenplanes + blueplanes))
- pm_error("BMHD/DCOL plane number mismatch");
-
- if (redplanes == blueplanes && redplanes == greenplanes) {
- scale = 0;
- maxval = pm_bitstomaxval(redplanes);
- }
- else {
- scale = 1;
- redmaxval = pm_bitstomaxval(redplanes);
- greenmaxval = pm_bitstomaxval(greenplanes);
- bluemaxval = pm_bitstomaxval(blueplanes);
-
- maxval = max(redmaxval, max(greenmaxval, bluemaxval));
- pm_message("rescaling colors to %d bits", pm_maxvaltobits(maxval));
- }
-
- if (maxval > PPM_MAXMAXVAL)
- pm_error("too many planes - try reconfiguring with PGM_BIGGRAYS\n or without PPM_PACKCOLORS");
-
- Rrow = alloc_rawrow(cols);
- Grow = alloc_rawrow(cols);
- Brow = alloc_rawrow(cols);
-
- ppm_writeppminit(stdout, cols, rows, maxval, 0);
- for (row = 0; row < rows; row++) {
- decode_row(ifp, Rrow, dcol->r, bmhd);
- decode_row(ifp, Grow, dcol->g, bmhd);
- decode_row(ifp, Brow, dcol->b, bmhd);
-
- if (scale) {
- for (col = 0; col < cols; col++) {
- PPM_ASSIGN(pixelrow[col],
- Rrow[col] * maxval / redmaxval,
- Grow[col] * maxval / greenmaxval,
- Brow[col] * maxval / bluemaxval);
- }
- }
- else {
- for (col = 0; col < cols; col++)
- PPM_ASSIGN(pixelrow[col], Rrow[col], Grow[col], Brow[col]);
- }
- ppm_writeppmrow(stdout, pixelrow, cols, maxval, 0);
- }
- pm_close(stdout);
- }
-
- static void cmap_to_ppm(colormap, colors)
- pixel *colormap;
- int colors;
- {
- pm_message("input is a colormap file");
-
- ppm_writeppminit(stdout, colors, 1, MAXCOLVAL, 0);
- ppm_writeppmrow(stdout, colormap, colors, MAXCOLVAL, 0);
- pm_close(stdout);
- }
-
- static void std_to_ppm(ifp, bmhd, colormap, colors, pchginfo, viewportmodes)
- FILE *ifp;
- BitMapHeader *bmhd;
- pixel *colormap;
- int colors;
- PCHGInfo *pchginfo;
- long viewportmodes;
- {
- rawtype *rawrow;
- pixval maxval;
- int row, rows, col, cols;
- int pchgflag = (pchginfo && colormap);
-
- cols = bmhd->w;
- rows = bmhd->h;
-
- pm_message("input is a %d-plane %s%sILBM", bmhd->nPlanes,
- pchgflag ? "multipalette " : "",
- viewportmodes & vmEXTRA_HALFBRITE ? "EHB " : ""
- );
-
- if (bmhd->nPlanes > MAXPLANES)
- pm_error("too many planes (max %d)", MAXPLANES);
-
- if (colormap)
- maxval = MAXCOLVAL;
- else {
- maxval = pm_bitstomaxval(bmhd->nPlanes);
- pm_message("no colormap - interpreting values as grayscale");
- }
- if (maxval > PPM_MAXMAXVAL)
- pm_error("nPlanes is too large - try reconfiguring with PGM_BIGGRAYS\n or without PPM_PACKCOLORS");
-
- if (pchgflag)
- init_pchg(pchginfo, colormap, colors, maxval);
-
- rawrow = alloc_rawrow(cols);
-
- if (viewportmodes & vmEXTRA_HALFBRITE)
- colormap = ehb_to_cmap(colormap, &colors);
-
- ppm_writeppminit(stdout, cols, rows, (pixval) maxval, 0);
- for (row = 0; row < rows; row++) {
-
- if (pchgflag)
- adjust_colormap(pchginfo, row);
-
- decode_row(ifp, rawrow, bmhd->nPlanes, bmhd);
- for (col = 0; col < cols; col++) {
- if (colormap)
- pixelrow[col] = colormap[rawrow[col]];
- else
- PPM_ASSIGN(pixelrow[col], rawrow[col], rawrow[col], rawrow[col]);
- }
- ppm_writeppmrow(stdout, pixelrow, cols, maxval, 0);
- }
- }
-
- static pixel *
- ehb_to_cmap(colormap, colors)
- pixel *colormap;
- int *colors;
- {
- pixel *tempcolormap = NULL;
- int i, col;
-
- if (colormap) {
- col = *colors;
- tempcolormap = ppm_allocrow(col * 2);
- for (i = 0; i < col; i++) {
- tempcolormap[i] = colormap[i];
- PPM_ASSIGN(tempcolormap[col + i], PPM_GETR(colormap[i]) / 2,
- PPM_GETG(colormap[i]) / 2, PPM_GETB(colormap[i]) / 2);
- }
- ppm_freerow(colormap);
- *colors *= 2;
- }
- return tempcolormap;
- }
-
- static void read_ilbm_plane(ifp, cols, compression)
- FILE *ifp;
- int cols, compression;
- {
- unsigned char *ubp;
- int bytes, j, byte;
-
- bytes = RowBytes(cols);
-
- switch (compression) {
- case cmpNone:
- j = fread(ilbmrow, 1, bytes, ifp);
- if (j != bytes)
- readerr(ifp);
- break;
- case cmpByteRun1:
- ubp = ilbmrow;
- do {
- byte = (int)get_byte(ifp);
- if (byte <= 127) {
- j = byte;
- bytes -= (j + 1);
- if (bytes < 0)
- pm_error("error doing ByteRun1 decompression");
- for (; j >= 0; j--)
- *ubp++ = get_byte(ifp);
- }
- else if (byte != 128) {
- j = 256 - byte;
- bytes -= (j + 1);
- if (bytes < 0)
- pm_error("error doing ByteRun1 decompression");
- byte = (int)get_byte(ifp);
- for (; j >= 0; j--)
- *ubp++ = (unsigned char)byte;
- }
- /* 128 is a NOP */
- }
- while (bytes > 0);
- break;
- default:
- pm_error("unknown compression type");
- }
- }
-
- const unsigned char bit_mask[] =
- {1, 2, 4, 8, 16, 32, 64, 128};
-
- static void decode_row(ifp, chunkyrow, nPlanes, bmhd)
- FILE *ifp;
- rawtype *chunkyrow;
- int nPlanes;
- BitMapHeader *bmhd;
- {
- int plane, col, cols;
- unsigned char *ilp;
- rawtype *chp;
-
- cols = bmhd->w;
- for (plane = 0; plane < nPlanes; plane++) {
- int mask, cbit;
-
- mask = 1 << plane;
- read_ilbm_plane(ifp, cols, bmhd->compression);
-
- ilp = ilbmrow;
- chp = chunkyrow;
-
- cbit = 7;
- for (col = 0; col < cols; col++, cbit--, chp++) {
- if (cbit < 0) {
- cbit = 7;
- ilp++;
- }
- if (*ilp & bit_mask[cbit])
- *chp |= mask;
- else
- *chp &= ~mask;
- }
- }
- /* skip mask plane */
- if (bmhd->masking == mskHasMask)
- read_ilbm_plane(ifp, cols, bmhd->compression);
- }
-
- static rawtype *
- alloc_rawrow(cols)
- int cols;
- {
- rawtype *r;
- int i;
-
- r = MALLOC(cols, rawtype);
-
- for (i = 0; i < cols; i++)
- r[i] = 0;
-
- return r;
- }
-
- static void *
- xmalloc(bytes)
- int bytes;
- {
- void *mem;
-
- if (bytes == 0)
- return NULL;
-
- mem = malloc(bytes);
- if (mem == NULL)
- pm_error("out of memory allocating %d bytes", bytes);
- return mem;
- }
-
- static void display_chunk(ifp, iffid, chunksize)
- FILE *ifp;
- char *iffid;
- long chunksize;
- {
- int byte;
-
- pm_message("contents of \"%s\" chunk:", iffid);
-
- while (chunksize--) {
- byte = get_byte(ifp);
- if (fputc(byte, stderr) == EOF)
- pm_error("write error");
- }
- if (fputc('\n', stderr) == EOF)
- pm_error("write error");
- }
-
- /*
- * PCHG stuff
- */
-
- static void PCHG_Decompress ARGS((PCHGHeader * PCHG, PCHGCompHeader * CompHdr, unsigned char *compdata, unsigned long compsize, unsigned char *comptree, unsigned char *data));
- static unsigned char *PCHG_MakeMask ARGS((PCHGHeader * PCHG, unsigned char *data, unsigned long datasize, unsigned char **newdata));
- static void PCHG_ConvertSmall ARGS((PCHGInfo * Info, unsigned char *data, unsigned long datasize));
- static void PCHG_ConvertBig ARGS((PCHGInfo * Info, unsigned char *data, unsigned long datasize));
- static void PCHG_DecompHuff ARGS((unsigned char *src, unsigned char *dest, short *tree, unsigned long origsize));
- static void pchgerr ARGS((char *when));
-
- /* Turn big-endian 4-byte long and 2-byte short stored at x (unsigned char *)
- * into the native format of the CPU
- */
- #define BIG_LONG(x) ( ((unsigned long)((x)[0]) << 24) + \
- ((unsigned long)((x)[1]) << 16) + \
- ((unsigned long)((x)[2]) << 8) + \
- ((unsigned long)((x)[3]) << 0) )
- #define BIG_WORD(x) ( ((unsigned short)((x)[0]) << 8) + \
- ((unsigned short)((x)[1]) << 0) )
-
- static PCHGInfo *
- read_pchg(ifp, bytesleft)
- FILE *ifp;
- unsigned long bytesleft;
- {
- static PCHGInfo Info;
- PCHGCompHeader CompHdr;
- PCHGHeader *PCHG;
- unsigned char *data, *chdata;
- unsigned long datasize;
-
- #ifdef DEBUG
- pm_message("PCHG chunk found");
- #endif
-
- if (bytesleft < PCHGHeaderSize)
- pchgerr("while reading PCHGHeader");
-
- Info.PCHG = PCHG = MALLOC(1, PCHGHeader);
- PCHG->Compression = get_big_short(ifp);
- PCHG->Flags = get_big_short(ifp);
- PCHG->StartLine = get_big_short(ifp);
- PCHG->LineCount = get_big_short(ifp);
- PCHG->ChangedLines = get_big_short(ifp);
- PCHG->MinReg = get_big_short(ifp);
- PCHG->MaxReg = get_big_short(ifp);
- PCHG->MaxChanges = get_big_short(ifp);
- PCHG->TotalChanges = get_big_long(ifp);
- bytesleft -= PCHGHeaderSize;
-
- #ifdef DEBUG
- pm_message("PCHG StartLine : %d", PCHG->StartLine);
- pm_message("PCHG LineCount : %d", PCHG->LineCount);
- pm_message("PCHG ChangedLines: %d", PCHG->ChangedLines);
- pm_message("PCHG TotalChanges: %d", PCHG->TotalChanges);
- #endif
-
- if (PCHG->Compression != PCHG_COMP_NONE) {
- unsigned char *compdata, *comptree;
- unsigned long treesize;
-
- if (bytesleft < PCHGCompHeaderSize)
- pchgerr("while reading PCHGCompHeader");
-
- CompHdr.CompInfoSize = get_big_long(ifp);
- CompHdr.OriginalDataSize = get_big_long(ifp);
- bytesleft -= PCHGCompHeaderSize;
- treesize = CompHdr.CompInfoSize;
- datasize = CompHdr.OriginalDataSize;
-
- if (bytesleft < treesize)
- pchgerr("while reading compression info data");
-
- comptree = MALLOC(treesize, unsigned char);
-
- if (fread(comptree, 1, treesize, ifp) != treesize)
- readerr(ifp);
-
- bytesleft -= treesize;
- if (bytesleft == 0)
- pchgerr("while reading compressed change structure data");
-
- compdata = MALLOC(bytesleft, unsigned char);
- data = MALLOC(datasize, unsigned char);
-
- if (fread(compdata, 1, bytesleft, ifp) != bytesleft)
- readerr(ifp);
-
- PCHG_Decompress(PCHG, &CompHdr, compdata, bytesleft, comptree, data);
- free(comptree);
- free(compdata);
- bytesleft = 0;
- }
- else {
- #ifdef DEBUG
- pm_message("uncompressed PCHG");
- #endif
- if (bytesleft == 0)
- pchgerr("while reading uncompressed change structure data");
-
- datasize = bytesleft;
- data = MALLOC(datasize, unsigned char);
-
- if (fread(data, 1, datasize, ifp) != datasize)
- readerr(ifp);
- bytesleft = 0;
- }
-
- Info.LineMask = PCHG_MakeMask(PCHG, data, datasize, &chdata);
- datasize -= (chdata - data);
-
- Info.Palette = MALLOC(PCHG->TotalChanges, PaletteChange);
- Info.Change = MALLOC(PCHG->ChangedLines, LineChanges);
-
- if (PCHG->Flags & PCHGF_USE_ALPHA)
- pm_message("warning - PCHG alpha channel not supported");
-
- if (PCHG->Flags & PCHGF_12BIT) {
- #ifdef DEBUG
- pm_message("SmallLineChanges");
- #endif
- PCHG_ConvertSmall(&Info, chdata, datasize);
- }
- else if (PCHG->Flags & PCHGF_32BIT) {
- #ifdef DEBUG
- pm_message("BigLineChanges");
- #endif
- PCHG_ConvertBig(&Info, chdata, datasize);
- }
- else
- pm_error("unknown palette changes structure format in PCHG chunk");
-
- free(data);
- return &Info;
- }
-
- static void PCHG_Decompress(PCHG, CompHdr, compdata, compsize, comptree, data)
- PCHGHeader *PCHG;
- PCHGCompHeader *CompHdr;
- unsigned char *compdata;
- unsigned long compsize;
- unsigned char *comptree;
- unsigned char *data;
- {
- short *hufftree;
- unsigned long huffsize, i;
- unsigned long treesize = CompHdr->CompInfoSize;
-
- switch (PCHG->Compression) {
- case PCHG_COMP_HUFFMAN:
-
- #ifdef DEBUG
- pm_message("PCHG Huffman compression");
- #endif
- /* turn big-endian 2-byte shorts into native format */
- huffsize = treesize / 2;
- hufftree = MALLOC(huffsize, short);
-
- for (i = 0; i < huffsize; i++) {
- hufftree[i] = (short)BIG_WORD(comptree);
- comptree += 2;
- }
-
- /* decompress the change structure data */
- PCHG_DecompHuff(compdata, data, &hufftree[huffsize - 1], CompHdr->OriginalDataSize);
-
- free(hufftree);
- break;
- default:
- pm_error("unknown PCHG compression type");
- }
- }
-
- static unsigned char *
- PCHG_MakeMask(PCHG, data, datasize, newdata)
- PCHGHeader *PCHG;
- unsigned char *data;
- unsigned long datasize;
- unsigned char **newdata;
- {
- unsigned long bytes;
- unsigned char *mask;
-
- /* the mask at 'data' is in 4-byte big-endian longword format,
- * thus we can simply treat it at unsigned char and don't have
- * to convert it, just copy it to a new mem block so we can
- * free the original data
- */
- bytes = MaskLongWords(PCHG->LineCount) * 4;
- if (datasize < bytes)
- pchgerr("for line mask");
- mask = MALLOC(bytes, unsigned char);
-
- #ifdef DEBUG
- pm_message("%ld bytes for line mask", bytes);
- #endif
- bcopy(data, mask, bytes);
-
- *newdata = (data + bytes);
- return mask;
- }
-
- static void PCHG_ConvertSmall(Info, data, datasize)
- PCHGInfo *Info;
- unsigned char *data;
- unsigned long datasize;
- {
- PCHGHeader *PCHG = Info->PCHG;
- LineChanges *Change = Info->Change;
- PaletteChange *Palette = Info->Palette;
- unsigned long i, palettecount = 0;
- unsigned char ChangeCount16, ChangeCount32;
- unsigned short SmallChange;
-
- Info->maxval = 15; /* 4 bit values */
-
- for (i = 0; i < PCHG->ChangedLines; i++) {
- int n;
-
- if (datasize < 2)
- goto fail;
- ChangeCount16 = *data++;
- ChangeCount32 = *data++;
- datasize -= 2;
-
- Change[i].Count = ChangeCount16 + ChangeCount32;
- Change[i].Palette = &Palette[palettecount];
-
- for (n = 0; n < Change[i].Count; n++) {
- if (palettecount >= PCHG->TotalChanges)
- goto fail;
- if (datasize < 2)
- goto fail;
- SmallChange = BIG_WORD(data);
- data += 2;
- datasize -= 2;
-
- Palette[palettecount].Register = (SmallChange >> 12) & 0x0f;
- if (n >= ChangeCount16)
- Palette[palettecount].Register += 16;
- Palette[palettecount].Alpha = 0;
- Palette[palettecount].Red = (SmallChange >> 8) & 0x0f;
- Palette[palettecount].Green = (SmallChange >> 4) & 0x0f;
- Palette[palettecount].Blue = SmallChange & 0x0f;
- palettecount++;
- }
- }
- #ifdef DEBUG
- pm_message("%ld palette change structures", palettecount);
- #endif
- return;
- fail:
- pchgerr("while building SmallLineChanges array");
- }
-
- static void PCHG_ConvertBig(Info, data, datasize)
- PCHGInfo *Info;
- unsigned char *data;
- unsigned long datasize;
- {
- PCHGHeader *PCHG = Info->PCHG;
- LineChanges *Change = Info->Change;
- PaletteChange *Palette = Info->Palette;
- unsigned long i, palettecount = 0;
-
- Info->maxval = MAXCOLVAL;
-
- for (i = 0; i < PCHG->ChangedLines; i++) {
- int n;
-
- if (datasize < 2)
- goto fail;
- Change[i].Count = BIG_WORD(data);
- data += 2;
- datasize -= 2;
-
- Change[i].Palette = &Palette[palettecount];
-
- for (n = 0; n < Change[i].Count; n++) {
- if (palettecount >= PCHG->TotalChanges)
- goto fail;
- if (datasize < 6)
- goto fail;
- Palette[palettecount].Register = BIG_WORD(data);
- data += 2;
- Palette[palettecount].Alpha = *data++;
- Palette[palettecount].Red = *data++;
- Palette[palettecount].Blue = *data++; /* yes, RBG */
- Palette[palettecount].Green = *data++;
- palettecount++;
- datasize -= 6;
- }
- }
- #ifdef DEBUG
- pm_message("%ld palette change structures", palettecount);
- #endif
- return;
- fail:
- pchgerr("while building BigLineChanges array");
- }
-
- static void pchgerr(when)
- char *when;
- {
- pm_message("insufficient data in PCHG chunk %s", when);
- pm_error("try the \"-ignore\" option to skip this chunk");
- }
-
- static void PCHG_DecompHuff(src, dest, tree, origsize)
- unsigned char *src, *dest;
- short *tree;
- unsigned long origsize;
- {
- unsigned long i = 0, bits = 0;
- unsigned char thisbyte;
- short *p;
-
- p = tree;
- while (i < origsize) {
- if (bits == 0) {
- thisbyte = *src++;
- bits = 8;
- }
- if (thisbyte & (1 << 7)) {
- if (*p >= 0) {
- *dest++ = (unsigned char)*p;
- i++;
- p = tree;
- }
- else
- p += (*p / 2);
- }
- else {
- p--;
- if (*p > 0 && (*p & 0x100)) {
- *dest++ = (unsigned char)*p;
- i++;
- p = tree;
- }
- }
- thisbyte <<= 1;
- bits--;
- }
- }
-
- static void init_pchg(pchginfo, colormap, colors, newmaxval)
- PCHGInfo *pchginfo;
- pixel *colormap;
- int colors;
- pixval newmaxval;
- {
- PCHGHeader *PCHG = pchginfo->PCHG;
- pixval oldmaxval = pchginfo->maxval;
- int row;
-
- pchginfo->colormap = colormap;
- pchginfo->colors = colors;
-
- if (oldmaxval != newmaxval) {
- PaletteChange *Palette = pchginfo->Palette;
- unsigned long i;
-
- #ifdef DEBUG
- pm_message("scaling PCHG palette from %d to %d", oldmaxval, newmaxval);
- #endif
-
- for (i = 0; i < PCHG->TotalChanges; i++) {
- Palette[i].Red = Palette[i].Red * newmaxval / oldmaxval;
- Palette[i].Green = Palette[i].Green * newmaxval / oldmaxval;
- Palette[i].Blue = Palette[i].Blue * newmaxval / oldmaxval;
- }
- pchginfo->maxval = newmaxval;
- }
-
- for (row = PCHG->StartLine; row < 0; row++)
- adjust_colormap(pchginfo, row);
- }
-
- static void adjust_colormap(pchginfo, row)
- PCHGInfo *pchginfo;
- int row;
- {
- static unsigned long maskcount, changecount;
- static unsigned char thismask;
- static int bits;
-
- PCHGHeader *PCHG = pchginfo->PCHG;
-
- if (row < PCHG->StartLine || changecount >= PCHG->ChangedLines)
- return;
-
- if (bits == 0) {
- thismask = pchginfo->LineMask[maskcount++];
- bits = 8;
- }
-
- if (thismask & (1 << 7)) {
- int i;
-
- for (i = 0; i < pchginfo->Change[changecount].Count; i++) {
- PaletteChange *pal = &(pchginfo->Change[changecount].Palette[i]);
- int reg = pal->Register;
-
- if (reg >= pchginfo->colors) {
- pm_message("warning - PCHG palette change register value out of range");
- pm_message(" row %d change structure %ld palette %d", row, changecount, i);
- pm_message(" ignoring it... colors might get messed up from here");
- }
- else
- PPM_ASSIGN(pchginfo->colormap[reg], pal->Red, pal->Green, pal->Blue);
- }
- changecount++;
- }
- thismask <<= 1;
- bits--;
- }
-
- static void scale_colormap(colormap, colors, oldmaxval, newmaxval)
- pixel *colormap;
- int colors;
- pixval oldmaxval, newmaxval;
- {
- int i, r, g, b;
-
- for (i = 0; i < colors; i++) {
- r = PPM_GETR(colormap[i]) * newmaxval / oldmaxval;
- g = PPM_GETG(colormap[i]) * newmaxval / oldmaxval;
- b = PPM_GETB(colormap[i]) * newmaxval / oldmaxval;
- PPM_ASSIGN(colormap[i], r, g, b);
- }
- }
-
- /* ppmtoilbm.c - read a portable pixmap and produce an IFF ILBM file
- *
- * Copyright (C) 1989 by Jef Poskanzer.
- * Modified by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
- * 20/Jun/93:
- * - 24bit support (new options -24if, -24force)
- * - HAM8 support (well, anything from HAM3 to HAM(MAXPLANES))
- * - now writes up to 8 (16) planes (new options -maxplanes, -fixplanes)
- * - colormap file (new option -map)
- * - write colormap only (new option -cmaponly)
- * - only writes CAMG chunk if it is a HAM-picture
- * 29/Aug/93:
- * - operates row-by-row whenever possible
- * - faster colorscaling with lookup-table (~20% faster on HAM pictures)
- * - options -ham8 and -ham6 now imply -hamforce
- * 27/Nov/93:
- * - byterun1 compression (this is now default) with new options:
- * -compress, -nocompress, -cmethod, -savemem
- * - floyd-steinberg error diffusion (for std+mapfile and HAM)
- * - new options: -lace and -hires --> write CAMG chunk
- * - LUT for luminance calculation (used by ppm_to_ham)
- *
- *
- * std HAM 24bit cmap direct
- * -------+-----+-----+-----+-----+-----
- * BMHD yes yes yes yes yes
- * CMAP yes (1) no yes no
- * BODY yes yes yes no yes
- * CAMG (2) yes (2) no (2)
- * other - - - - DCOL
- * nPlanes 1-8 3-8 24 0 3-24 if configured without ILBM_BIGRAW
- * nPlanes 1-16 3-16 24 0 3-48 if configured with ILBM_BIGRAW
- *
- * (1): grayscale colormap
- * (2): only if "-lace" or "-hires" option used
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted, provided
- * that the above copyright notice appear in all copies and that both that
- * copyright notice and this permission notice appear in supporting
- * documentation. This software is provided "as is" without express or
- * implied warranty.
- */
-
- #define MODE_DIRECT 4 /* direct color ILBM */
- #define MODE_CMAP 3 /* write normal file, but colormap only */
- #define MODE_24 2 /* write a 24bit (deep) ILBM */
- #define MODE_HAM 1 /* write a HAM */
- #define MODE_NONE 0 /* write a normal picture */
-
- #define DEF_MAXPLANES 8
- #define DEF_HAMPLANES 8
- #define DEF_DCOLPLANES 5
- #define DEF_COMPRESSION cmpByteRun1
-
- typedef struct {
- int len;
- unsigned char *row;
- } bodyrow;
-
- typedef struct {
- long *thisrederr, *thisgreenerr, *thisblueerr;
- long *nextrederr, *nextgreenerr, *nextblueerr;
- int lefttoright; /* 1 for left-to-right scan, 0 for right-to-left */
- int cols;
- pixel *pixrow;
- pixval maxval;
- int col, col_end;
- int alternate;
- pixval red, green, blue; /* values of current pixel */
- } floydinfo;
-
- static int colorstobpp ARGS((int colors));
-
- #define put_fourchars(str) (void)(fputs(str, stdout))
- static void put_big_short ARGS((short s));
- static void put_big_long ARGS((long l));
-
- #define put_byte(b) (void)(putc((unsigned char)(b), stdout))
- static void ppm_to_ham ARGS((FILE * fp, int cols, int rows, int maxval, int hambits, int nocolor));
- static void ppm_to_24 ARGS((FILE * fp, int cols, int rows, int maxval));
- static void ppm_to_direct ARGS((FILE * fp, int cols, int rows, int maxval, DirectColor * direct));
- static void ppm_to_std ARGS((FILE * fp, int cols, int rows, int maxval, colorhist_vector chv, int colors, int nPlanes));
- static void ppm_to_cmap ARGS((int maxval, colorhist_vector chv, int colors));
- static void write_form_ilbm ARGS((int size));
- static void write_bmhd ARGS((int cols, int rows, int nPlanes));
- static void write_std_cmap ARGS((colorhist_vector chv, int colors, int maxval));
- static int encode_row ARGS((FILE * outfile, rawtype * rawrow, int cols, int nPlanes));
- static int compress_row ARGS((int bytes));
- static int runbyte1 ARGS((int bytes));
- static pixel *next_pixrow ARGS((FILE * fp, int row));
- static pixval *make_val_table ARGS((pixval oldmaxval, pixval newmaxval));
- static void *xmalloc ARGS((int bytes));
-
- #define MALLOC(n, type) (type *)tmalloc((n) * sizeof(type))
- static void init_read ARGS((FILE * fp, int *colsP, int *rowsP, pixval * maxvalP, int *formatP, int readall));
- static void write_body ARGS((void));
- static void write_camg ARGS((void));
- static void alloc_body_array ARGS((int rows, int nPlanes));
- static void free_body_array ARGS((void));
-
- #define PAD(n) odd(n) /* pad to a word */
- static int closest_color ARGS((colorhist_vector chv, int colors, pixval cmaxval, pixel * pP));
- static floydinfo *init_floyd ARGS((int cols, pixval maxval, int alternate));
- static void free_floyd ARGS((floydinfo * fi));
- static void begin_floyd_row ARGS((floydinfo * fi, pixel * prow));
- static pixel *next_floyd_pixel ARGS((floydinfo * fi));
- static void update_floyd_pixel ARGS((floydinfo * fi, int r, int g, int b));
- static void end_floyd_row ARGS((floydinfo * fi));
-
- /* global data */
- static unsigned char *coded_rowbuf; /* buffer for uncompressed scanline */
- static unsigned char *compr_rowbuf; /* buffer for compressed scanline */
- static pixel **pixels; /* PPM image (NULL for row-by-row operation) */
- static pixel *pixrow; /* current row in PPM image (pointer into pixels array, or buffer for row-by-row operation) */
- static bodyrow *ilbm_body = NULL; /* compressed ILBM BODY */
-
- static long viewportmodes = 0;
- static int compr_type = DEF_COMPRESSION;
-
- /* flags */
- static short savemem = 0; /* slow operation, but uses less memory */
- static short compr_force = 0; /* force compressed output, even if the image got larger - NOT USED */
- static short floyd = 0; /* apply floyd-steinberg error diffusion */
-
- #define WORSTCOMPR(bytes) ((bytes) + (bytes)/128 + 1)
- #define DO_COMPRESS (compr_type != cmpNone)
- #define CAMGSIZE (viewportmodes == 0 ? 0 : (4 + 4 + CAMGChunkSize))
-
- /* Lookup tables for fast RGB -> luminance calculation. */
- /* taken from ppmtopgm.c -IUW */
-
- static int times77[256] =
- {
- 0, 77, 154, 231, 308, 385, 462, 539,
- 616, 693, 770, 847, 924, 1001, 1078, 1155,
- 1232, 1309, 1386, 1463, 1540, 1617, 1694, 1771,
- 1848, 1925, 2002, 2079, 2156, 2233, 2310, 2387,
- 2464, 2541, 2618, 2695, 2772, 2849, 2926, 3003,
- 3080, 3157, 3234, 3311, 3388, 3465, 3542, 3619,
- 3696, 3773, 3850, 3927, 4004, 4081, 4158, 4235,
- 4312, 4389, 4466, 4543, 4620, 4697, 4774, 4851,
- 4928, 5005, 5082, 5159, 5236, 5313, 5390, 5467,
- 5544, 5621, 5698, 5775, 5852, 5929, 6006, 6083,
- 6160, 6237, 6314, 6391, 6468, 6545, 6622, 6699,
- 6776, 6853, 6930, 7007, 7084, 7161, 7238, 7315,
- 7392, 7469, 7546, 7623, 7700, 7777, 7854, 7931,
- 8008, 8085, 8162, 8239, 8316, 8393, 8470, 8547,
- 8624, 8701, 8778, 8855, 8932, 9009, 9086, 9163,
- 9240, 9317, 9394, 9471, 9548, 9625, 9702, 9779,
- 9856, 9933, 10010, 10087, 10164, 10241, 10318, 10395,
- 10472, 10549, 10626, 10703, 10780, 10857, 10934, 11011,
- 11088, 11165, 11242, 11319, 11396, 11473, 11550, 11627,
- 11704, 11781, 11858, 11935, 12012, 12089, 12166, 12243,
- 12320, 12397, 12474, 12551, 12628, 12705, 12782, 12859,
- 12936, 13013, 13090, 13167, 13244, 13321, 13398, 13475,
- 13552, 13629, 13706, 13783, 13860, 13937, 14014, 14091,
- 14168, 14245, 14322, 14399, 14476, 14553, 14630, 14707,
- 14784, 14861, 14938, 15015, 15092, 15169, 15246, 15323,
- 15400, 15477, 15554, 15631, 15708, 15785, 15862, 15939,
- 16016, 16093, 16170, 16247, 16324, 16401, 16478, 16555,
- 16632, 16709, 16786, 16863, 16940, 17017, 17094, 17171,
- 17248, 17325, 17402, 17479, 17556, 17633, 17710, 17787,
- 17864, 17941, 18018, 18095, 18172, 18249, 18326, 18403,
- 18480, 18557, 18634, 18711, 18788, 18865, 18942, 19019,
- 19096, 19173, 19250, 19327, 19404, 19481, 19558, 19635};
- static int times150[256] =
- {
- 0, 150, 300, 450, 600, 750, 900, 1050,
- 1200, 1350, 1500, 1650, 1800, 1950, 2100, 2250,
- 2400, 2550, 2700, 2850, 3000, 3150, 3300, 3450,
- 3600, 3750, 3900, 4050, 4200, 4350, 4500, 4650,
- 4800, 4950, 5100, 5250, 5400, 5550, 5700, 5850,
- 6000, 6150, 6300, 6450, 6600, 6750, 6900, 7050,
- 7200, 7350, 7500, 7650, 7800, 7950, 8100, 8250,
- 8400, 8550, 8700, 8850, 9000, 9150, 9300, 9450,
- 9600, 9750, 9900, 10050, 10200, 10350, 10500, 10650,
- 10800, 10950, 11100, 11250, 11400, 11550, 11700, 11850,
- 12000, 12150, 12300, 12450, 12600, 12750, 12900, 13050,
- 13200, 13350, 13500, 13650, 13800, 13950, 14100, 14250,
- 14400, 14550, 14700, 14850, 15000, 15150, 15300, 15450,
- 15600, 15750, 15900, 16050, 16200, 16350, 16500, 16650,
- 16800, 16950, 17100, 17250, 17400, 17550, 17700, 17850,
- 18000, 18150, 18300, 18450, 18600, 18750, 18900, 19050,
- 19200, 19350, 19500, 19650, 19800, 19950, 20100, 20250,
- 20400, 20550, 20700, 20850, 21000, 21150, 21300, 21450,
- 21600, 21750, 21900, 22050, 22200, 22350, 22500, 22650,
- 22800, 22950, 23100, 23250, 23400, 23550, 23700, 23850,
- 24000, 24150, 24300, 24450, 24600, 24750, 24900, 25050,
- 25200, 25350, 25500, 25650, 25800, 25950, 26100, 26250,
- 26400, 26550, 26700, 26850, 27000, 27150, 27300, 27450,
- 27600, 27750, 27900, 28050, 28200, 28350, 28500, 28650,
- 28800, 28950, 29100, 29250, 29400, 29550, 29700, 29850,
- 30000, 30150, 30300, 30450, 30600, 30750, 30900, 31050,
- 31200, 31350, 31500, 31650, 31800, 31950, 32100, 32250,
- 32400, 32550, 32700, 32850, 33000, 33150, 33300, 33450,
- 33600, 33750, 33900, 34050, 34200, 34350, 34500, 34650,
- 34800, 34950, 35100, 35250, 35400, 35550, 35700, 35850,
- 36000, 36150, 36300, 36450, 36600, 36750, 36900, 37050,
- 37200, 37350, 37500, 37650, 37800, 37950, 38100, 38250};
- static int times29[256] =
- {
- 0, 29, 58, 87, 116, 145, 174, 203,
- 232, 261, 290, 319, 348, 377, 406, 435,
- 464, 493, 522, 551, 580, 609, 638, 667,
- 696, 725, 754, 783, 812, 841, 870, 899,
- 928, 957, 986, 1015, 1044, 1073, 1102, 1131,
- 1160, 1189, 1218, 1247, 1276, 1305, 1334, 1363,
- 1392, 1421, 1450, 1479, 1508, 1537, 1566, 1595,
- 1624, 1653, 1682, 1711, 1740, 1769, 1798, 1827,
- 1856, 1885, 1914, 1943, 1972, 2001, 2030, 2059,
- 2088, 2117, 2146, 2175, 2204, 2233, 2262, 2291,
- 2320, 2349, 2378, 2407, 2436, 2465, 2494, 2523,
- 2552, 2581, 2610, 2639, 2668, 2697, 2726, 2755,
- 2784, 2813, 2842, 2871, 2900, 2929, 2958, 2987,
- 3016, 3045, 3074, 3103, 3132, 3161, 3190, 3219,
- 3248, 3277, 3306, 3335, 3364, 3393, 3422, 3451,
- 3480, 3509, 3538, 3567, 3596, 3625, 3654, 3683,
- 3712, 3741, 3770, 3799, 3828, 3857, 3886, 3915,
- 3944, 3973, 4002, 4031, 4060, 4089, 4118, 4147,
- 4176, 4205, 4234, 4263, 4292, 4321, 4350, 4379,
- 4408, 4437, 4466, 4495, 4524, 4553, 4582, 4611,
- 4640, 4669, 4698, 4727, 4756, 4785, 4814, 4843,
- 4872, 4901, 4930, 4959, 4988, 5017, 5046, 5075,
- 5104, 5133, 5162, 5191, 5220, 5249, 5278, 5307,
- 5336, 5365, 5394, 5423, 5452, 5481, 5510, 5539,
- 5568, 5597, 5626, 5655, 5684, 5713, 5742, 5771,
- 5800, 5829, 5858, 5887, 5916, 5945, 5974, 6003,
- 6032, 6061, 6090, 6119, 6148, 6177, 6206, 6235,
- 6264, 6293, 6322, 6351, 6380, 6409, 6438, 6467,
- 6496, 6525, 6554, 6583, 6612, 6641, 6670, 6699,
- 6728, 6757, 6786, 6815, 6844, 6873, 6902, 6931,
- 6960, 6989, 7018, 7047, 7076, 7105, 7134, 7163,
- 7192, 7221, 7250, 7279, 7308, 7337, 7366, 7395};
-
- /************ parse options and figure out what kind of ILBM to write ************/
-
- static int get_int_val ARGS((char *string, char *option, int bot, int top));
- static int get_compr_type ARGS((char *string));
-
- #define NEWDEPTH(pix, table) PPM_ASSIGN((pix), (table)[PPM_GETR(pix)], (table)[PPM_GETG(pix)], (table)[PPM_GETB(pix)])
-
- int main(argc, argv)
- int argc;
- char *argv[];
- {
- FILE *ifp;
- int argn, rows, cols, format, colors, nPlanes;
- int ifmode, forcemode, maxplanes, fixplanes, hambits, mode;
-
- #define MAXCOLORS (1<<maxplanes)
- pixval maxval;
- colorhist_vector chv;
- DirectColor dcol;
- char *mapfile;
- char *usage =
- "[-ecs|-aga] [-ham6|-ham8] [-maxplanes|-mp n] [-fixplanes|-fp n]\
- [-normal|-hamif|-hamforce|-24if|-24force|-dcif|-dcforce|-cmaponly]\
- [-hambits|-hamplanes n] [-dcbits|-dcplanes r g b] [-hires] [-lace]\
- [-floyd|-fs] [-compress|-nocompress] [-cmethod none|byterun1]\
- [-map ppmfile] [-savemem] [ppmfile]";
-
- ppm_init(&argc, argv);
-
- ifmode = MODE_NONE;
- forcemode = MODE_NONE;
- maxplanes = DEF_MAXPLANES;
- fixplanes = 0;
- hambits = DEF_HAMPLANES;
- mapfile = NULL;
- dcol.r = dcol.g = dcol.b = DEF_DCOLPLANES;
-
- argn = 1;
- while (argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0') {
- if (pm_keymatch(argv[argn], "-maxplanes", 4) || pm_keymatch(argv[argn], "-mp", 3)) {
- if (++argn >= argc)
- pm_usage(usage);
- maxplanes = get_int_val(argv[argn], argv[argn - 1], 1, MAXPLANES);
- fixplanes = 0;
- }
- else if (pm_keymatch(argv[argn], "-fixplanes", 4) || pm_keymatch(argv[argn], "-fp", 3)) {
- if (++argn >= argc)
- pm_usage(usage);
- fixplanes = get_int_val(argv[argn], argv[argn - 1], 1, MAXPLANES);
- maxplanes = fixplanes;
- }
- else if (pm_keymatch(argv[argn], "-map", 4)) {
- if (++argn >= argc)
- pm_usage(usage);
- mapfile = argv[argn];
- }
- else if (pm_keymatch(argv[argn], "-cmaponly", 3)) {
- forcemode = MODE_CMAP;
- }
- else if (pm_keymatch(argv[argn], "-hambits", 5) || pm_keymatch(argv[argn], "-hamplanes", 5)) {
- if (++argn > argc)
- pm_usage(usage);
- hambits = get_int_val(argv[argn], argv[argn - 1], 3, MAXPLANES);
- }
- else if (pm_keymatch(argv[argn], "-ham6", 5)) {
- hambits = ECS_HAMPLANES;
- forcemode = MODE_HAM;
- }
- else if (pm_keymatch(argv[argn], "-ham8", 5)) {
- hambits = AGA_HAMPLANES;
- forcemode = MODE_HAM;
- }
- else if (pm_keymatch(argv[argn], "-lace", 2)) {
- #ifdef ILBM_PCHG
- slicesize = 2;
- #endif
- viewportmodes |= vmLACE;
- }
- else if (pm_keymatch(argv[argn], "-nolace", 4)) {
- #ifdef ILBM_PCHG
- slicesize = 1;
- #endif
- viewportmodes &= ~vmLACE;
- }
- else if (pm_keymatch(argv[argn], "-hires", 3))
- viewportmodes |= vmHIRES;
- else if (pm_keymatch(argv[argn], "-nohires", 5))
- viewportmodes &= ~vmHIRES;
- else if (pm_keymatch(argv[argn], "-ecs", 2)) {
- maxplanes = ECS_MAXPLANES;
- hambits = ECS_HAMPLANES;
- }
- else if (pm_keymatch(argv[argn], "-aga", 2)) {
- maxplanes = AGA_MAXPLANES;
- hambits = AGA_HAMPLANES;
- }
- else if (pm_keymatch(argv[argn], "-hamif", 5))
- ifmode = MODE_HAM;
- else if (pm_keymatch(argv[argn], "-nohamif", 7)) {
- if (ifmode == MODE_HAM)
- ifmode = MODE_NONE;
- }
- else if (pm_keymatch(argv[argn], "-hamforce", 5))
- forcemode = MODE_HAM;
- else if (pm_keymatch(argv[argn], "-nohamforce", 7)) {
- if (forcemode == MODE_HAM)
- forcemode = MODE_NONE;
- }
- else if (pm_keymatch(argv[argn], "-24if", 4))
- ifmode = MODE_24;
- else if (pm_keymatch(argv[argn], "-no24if", 6)) {
- if (ifmode == MODE_24)
- ifmode = MODE_NONE;
- }
- else if (pm_keymatch(argv[argn], "-24force", 4))
- forcemode = MODE_24;
- else if (pm_keymatch(argv[argn], "-no24force", 6)) {
- if (forcemode == MODE_24)
- forcemode = MODE_NONE;
- }
- else if (pm_keymatch(argv[argn], "-dcif", 4)) {
- ifmode = MODE_DIRECT;
- }
- else if (pm_keymatch(argv[argn], "-nodcif", 6)) {
- if (ifmode == MODE_DIRECT)
- ifmode = MODE_NONE;
- }
- else if (pm_keymatch(argv[argn], "-dcforce", 4)) {
- forcemode = MODE_DIRECT;
- }
- else if (pm_keymatch(argv[argn], "-nodcforce", 6)) {
- if (forcemode == MODE_DIRECT)
- forcemode = MODE_NONE;
- }
- else if (pm_keymatch(argv[argn], "-dcbits", 4) || pm_keymatch(argv[argn], "-dcplanes", 4)) {
- char *option = argv[argn];
-
- if (++argn >= argc)
- pm_usage(usage);
- dcol.r = (unsigned char)get_int_val(argv[argn], option, 1, MAXPLANES);
- if (++argn >= argc)
- pm_usage(usage);
- dcol.g = (unsigned char)get_int_val(argv[argn], option, 1, MAXPLANES);
- if (++argn >= argc)
- pm_usage(usage);
- dcol.b = (unsigned char)get_int_val(argv[argn], option, 1, MAXPLANES);
- }
- else if (pm_keymatch(argv[argn], "-normal", 4)) {
- ifmode = forcemode = MODE_NONE;
- compr_type = DEF_COMPRESSION;
- }
- else if (pm_keymatch(argv[argn], "-compress", 3)) {
- compr_force = 1;
- if (compr_type == cmpNone)
- if (DEF_COMPRESSION == cmpNone)
- compr_type = cmpByteRun1;
- else
- compr_type = DEF_COMPRESSION;
- }
- else if (pm_keymatch(argv[argn], "-nocompress", 4)) {
- compr_force = 0;
- compr_type = cmpNone;
- }
- else if (pm_keymatch(argv[argn], "-cmethod", 4)) {
- if (++argn >= argc)
- pm_usage(usage);
- compr_type = get_compr_type(argv[argn]);
- }
- else if (pm_keymatch(argv[argn], "-savemem", 2))
- savemem = 1;
- else if (pm_keymatch(argv[argn], "-fs1", 4)) /* EXPERIMENTAL */
- floyd = 2;
- else if (pm_keymatch(argv[argn], "-floyd", 3) || pm_keymatch(argv[argn], "-fs", 3))
- floyd = 1;
- else if (pm_keymatch(argv[argn], "-nofloyd", 5) || pm_keymatch(argv[argn], "-nofs", 5))
- floyd = 0;
- else
- pm_usage(usage);
- ++argn;
- }
-
- if (argn < argc) {
- ifp = pm_openr(argv[argn]);
- ++argn;
- }
- else
- ifp = stdin;
-
- if (argn != argc)
- pm_usage(usage);
-
- if (forcemode != MODE_NONE && mapfile != NULL)
- pm_message("warning - mapfile only used for normal ILBMs");
-
- mode = forcemode;
- switch (forcemode) {
- case MODE_HAM:
- /* grayscale colormap for now - we don't need to read the whole
- * file into memory and can use row-by-row operation */
- init_read(ifp, &cols, &rows, &maxval, &format, 0);
- pm_message("hamforce option used - proceeding to write a HAM%d file", hambits);
- break;
- case MODE_24:
- init_read(ifp, &cols, &rows, &maxval, &format, 0);
- pm_message("24force option used - proceeding to write a 24bit file");
- break;
- case MODE_DIRECT:
- init_read(ifp, &cols, &rows, &maxval, &format, 0);
- pm_message("dcforce option used - proceeding to write a %d:%d:%d direct color file",
- dcol.r, dcol.g, dcol.b);
- break;
- case MODE_CMAP:
- /* must read the whole file into memory */
- init_read(ifp, &cols, &rows, &maxval, &format, 1);
-
- /* Figure out the colormap. */
- pm_message("computing colormap...");
- chv = ppm_computecolorhist(pixels, cols, rows, MAXCMAPCOLORS, &colors);
- if (chv == (colorhist_vector) NULL)
- pm_error("too many colors - try doing a 'ppmquant %d'", MAXCMAPCOLORS);
- pm_message("%d colors found", colors);
- break;
- default:
- /* must read the whole file into memory */
- init_read(ifp, &cols, &rows, &maxval, &format, 1);
-
- /* Figure out the colormap. */
- if (mapfile) {
- int mapcols, maprows, row, col;
- pixel **mappixels, *pP;
- pixval mapmaxval;
- FILE *mapfp;
-
- pm_message("reading colormap file...");
- mapfp = pm_openr(mapfile);
- mappixels = ppm_readppm(mapfp, &mapcols, &maprows, &mapmaxval);
- pm_close(mapfp);
- if (mapcols == 0 || maprows == 0)
- pm_error("null colormap??");
-
- /* if the maxvals of the ppmfile and the mapfile are the same,
- * then the scaling to MAXCOLVAL (if necessary) will be done by
- * the write_std_cmap() function.
- * Otherwise scale them both to MAXCOLVAL.
- */
- if (maxval != mapmaxval) {
- if (mapmaxval != MAXCOLVAL) {
- pixval *table;
-
- pm_message("colormap maxval is not %d - rescaling colormap...", MAXCOLVAL);
- table = make_val_table(mapmaxval, MAXCOLVAL);
- for (row = 0; row < maprows; ++row)
- for (col = 0, pP = mappixels[row]; col < mapcols; ++col, ++pP)
- NEWDEPTH(*pP, table); /* was PPM_DEPTH( *pP, *pP, mapmaxval, MAXCOLVAL ); */
- mapmaxval = MAXCOLVAL;
- free(table);
- }
-
- if (maxval != mapmaxval) {
- pixval *table;
-
- pm_message("rescaling colors of picture...");
- table = make_val_table(maxval, mapmaxval);
- for (row = 0; row < rows; ++row)
- for (col = 0, pP = pixels[row]; col < cols; ++col, ++pP)
- NEWDEPTH(*pP, table); /* was PPM_DEPTH( *pP, *pP, maxval, mapmaxval ); */
- maxval = mapmaxval;
- free(table);
- }
- }
-
- pm_message("computing colormap...");
- chv = ppm_computecolorhist(mappixels, mapcols, maprows, MAXCMAPCOLORS, &colors);
- ppm_freearray(mappixels, maprows);
- if (chv == (colorhist_vector) 0)
- pm_error("too many colors in colormap!");
- pm_message("%d colors found in colormap", colors);
-
- nPlanes = fixplanes = maxplanes = colorstobpp(colors);
- }
- else { /* no mapfile */
- pm_message("computing colormap...");
- chv = ppm_computecolorhist(pixels, cols, rows, MAXCOLORS, &colors);
- if (chv == (colorhist_vector) 0) {
- /* too many colors */
- mode = ifmode;
- switch (ifmode) {
- case MODE_HAM:
- pm_message("too many colors - proceeding to write a HAM%d file", hambits);
- pm_message("if you want a non-HAM file, try doing a 'ppmquant %d'", MAXCOLORS);
- break;
- case MODE_24:
- pm_message("too many colors - proceeding to write a 24bit file");
- pm_message("if you want a non-24bit file, try doing a 'ppmquant %d'", MAXCOLORS);
- break;
- case MODE_DIRECT:
- pm_message("too many colors - proceeding to write a %d:%d:%d direct color file",
- dcol.r, dcol.g, dcol.b);
- pm_message("if you want a non-direct-color file, try doing a 'ppmquant %d'", MAXCOLORS);
- break;
- default:
- pm_message("too many colors for %d planes", maxplanes);
- pm_message("either use -hamif/-hamforce/-24if/-24force/-dcif/-dcforce/-maxplanes,");
- pm_error("or try doing a 'ppmquant %d'", MAXCOLORS);
- break;
- }
- }
- else {
- pm_message("%d colors found", colors);
- nPlanes = colorstobpp(colors);
- if (fixplanes > nPlanes)
- nPlanes = fixplanes;
- }
- }
- break;
- }
-
- if (mode != MODE_CMAP) {
- register int i;
- coded_rowbuf = MALLOC(RowBytes(cols), unsigned char);
-
- for (i = 0; i < RowBytes(cols); i++)
- coded_rowbuf[i] = 0;
- if (DO_COMPRESS)
- compr_rowbuf = MALLOC(WORSTCOMPR(RowBytes(cols)), unsigned char);
- }
-
- switch (mode) {
- case MODE_HAM:{
- int nocolor;
-
- nocolor = !(PPM_FORMAT_TYPE(format) == PPM_TYPE);
- if (nocolor)
- floyd = 0;
-
- viewportmodes |= vmHAM;
- ppm_to_ham(ifp, cols, rows, maxval, hambits, nocolor);
- }
- break;
- case MODE_24:
- ppm_to_24(ifp, cols, rows, maxval);
- break;
- case MODE_DIRECT:
- ppm_to_direct(ifp, cols, rows, maxval, &dcol);
- break;
- case MODE_CMAP:
- ppm_to_cmap(maxval, chv, colors);
- break;
- default:
- if (mapfile == NULL)
- floyd = 0; /* would only slow down conversion */
- ppm_to_std(ifp, cols, rows, maxval, chv, colors, nPlanes);
- break;
- }
- pm_close(ifp);
- exit(0);
- /*NOTREACHED */
- }
-
- static int get_int_val(string, option, bot, top)
- char *string, *option;
- int bot, top;
- {
- int val;
-
- if (sscanf(string, "%d", &val) != 1)
- pm_error("option \"%s\" needs integer argument", option);
-
- if (val < bot || val > top)
- pm_error("option \"%s\" argument value out of range (%d..%d)", option, bot, top);
-
- return val;
- }
-
- static int get_compr_type(string)
- char *string;
- {
- int i;
-
- for (i = 0; i <= cmpMAXKNOWN; i++) {
- if (strcmp(string, cmpNAME[i]) == 0)
- return i;
- }
- pm_message("unknown compression method: %s", string);
- pm_message("using default compression (%s)", cmpNAME[DEF_COMPRESSION]);
- return DEF_COMPRESSION;
- }
-
- /************ colormap file ************/
-
- static void ppm_to_cmap(maxval, chv, colors)
- int maxval;
- colorhist_vector chv;
- int colors;
- {
- int formsize, cmapsize;
-
- cmapsize = colors * 3;
-
- formsize =
- 4 + /* ILBM */
- 4 + 4 + BitMapHeaderSize + /* BMHD size header */
- 4 + 4 + cmapsize + PAD(cmapsize); /* CMAP size colormap */
-
- write_form_ilbm(formsize);
- write_bmhd(0, 0, 0);
- write_std_cmap(chv, colors, maxval);
- }
-
- /************ HAM ************/
-
- static long do_ham_body ARGS((FILE * ifp, FILE * ofp, int cols, int rows, pixval maxval, pixval hammaxval, int nPlanes, int colbits, int no));
-
- static void ppm_to_ham(fp, cols, rows, maxval, hambits, nocolor)
- FILE *fp;
- int cols, rows, maxval, hambits, nocolor;
- {
- int colors, colbits, nPlanes, i, hammaxval;
- long oldsize, bodysize, formsize, cmapsize;
- pixval *table = NULL;
-
- colbits = hambits - 2;
- colors = 1 << colbits;
- hammaxval = pm_bitstomaxval(colbits);
- nPlanes = hambits;
- cmapsize = colors * 3;
-
- bodysize = oldsize = rows * nPlanes * RowBytes(cols);
- if (DO_COMPRESS) {
- alloc_body_array(rows, nPlanes);
- bodysize = do_ham_body(fp, NULL, cols, rows, maxval, hammaxval, nPlanes, colbits, nocolor);
- if (bodysize > oldsize)
- pm_message("warning - %s compression increases BODY size by %d%%", cmpNAME[compr_type], 100 * (bodysize - oldsize) / oldsize);
- else
- pm_message("BODY compression (%s): %d%%", cmpNAME[compr_type], 100 * (oldsize - bodysize) / oldsize);
- }
-
- formsize =
- 4 + /* ILBM */
- 4 + 4 + BitMapHeaderSize + /* BMHD size header */
- CAMGSIZE + /* 0 or CAMG size val */
- 4 + 4 + cmapsize + PAD(cmapsize) + /* CMAP size colormap */
- 4 + 4 + bodysize + PAD(bodysize); /* BODY size data */
-
- write_form_ilbm(formsize);
- write_bmhd(cols, rows, nPlanes);
- write_camg();
-
- /* write grayscale colormap */
- put_fourchars("CMAP");
- put_big_long(cmapsize);
- table = make_val_table(hammaxval, MAXCOLVAL);
- for (i = 0; i < colors; i++) {
- put_byte(table[i]); /* red */
- put_byte(table[i]); /* green */
- put_byte(table[i]); /* blue */
- }
- free(table);
- if (odd(cmapsize))
- put_byte(0);
-
- /* write body */
- put_fourchars("BODY");
- put_big_long(bodysize);
- if (DO_COMPRESS)
- write_body();
- else
- do_ham_body(fp, stdout, cols, rows, maxval, hammaxval, nPlanes, colbits, nocolor);
- if (odd(bodysize))
- put_byte(0);
- }
-
- static long do_ham_body(ifp, ofp, cols, rows, maxval, hammaxval, nPlanes, colbits, nocolor)
- FILE *ifp, *ofp;
- int cols, rows;
- pixval maxval, hammaxval;
- int nPlanes, colbits, nocolor;
- {
- register int col, row;
- pixel *pP;
- pixval *table = NULL;
- rawtype *raw_rowbuf;
- floydinfo *fi;
- long bodysize = 0;
-
- raw_rowbuf = MALLOC(cols, rawtype);
-
- if (hammaxval != maxval)
- table = make_val_table(maxval, hammaxval);
-
- if (floyd) {
- fi = init_floyd(cols, maxval, 0);
- }
-
- for (row = 0; row < rows; row++) {
- register int noprev, pr, pg, pb, r, g, b, l;
- int fpr, fpg, fpb; /* unscaled previous color values, for floyd */
-
- pP = next_pixrow(ifp, row);
- if (floyd)
- begin_floyd_row(fi, pP);
-
- noprev = 1;
- for (col = 0; col < cols; col++, pP++) {
- int fr, fg, fb, fl; /* unscaled color values, for floyd */
-
- if (floyd)
- pP = next_floyd_pixel(fi);
-
- r = fr = PPM_GETR(*pP);
- g = fg = PPM_GETG(*pP);
- b = fb = PPM_GETB(*pP);
- if (maxval <= 255) /* Use fast approximation to 0.299 r + 0.587 g + 0.114 b. */
- l = fl = (int)((times77[r] + times150[g] + times29[b] + 128) >> 8);
- else /* Can't use fast approximation, so fall back on floats. */
- l = fl = (int)(PPM_LUMIN(*pP) + 0.5); /* -IUW added '+ 0.5' */
-
- if (table) {
- r = table[r];
- g = table[g];
- b = table[b];
- l = table[l];
- }
-
- if (noprev || nocolor) {
- /* No previous pixels, gotta use the gray option. */
- raw_rowbuf[col] = l /* + (HAMCODE_CMAP << colbits) */ ;
- pr = pg = pb = l;
- fpr = fpg = fpb = fl;
- noprev = 0;
- }
- else {
- register int dred, dgreen, dblue, dgray;
-
- /* Compute distances for the four options. */
- dred = abs(g - pg) + abs(b - pb);
- dgreen = abs(r - pr) + abs(b - pb);
- dblue = abs(r - pr) + abs(g - pg);
- dgray = abs(r - l) + abs(g - l) + abs(b - l);
-
- /* simply doing raw_rowbuf[col] = ...
- * is ok here because there is no fs-alternation performed
- * for HAM. Otherwise we would have to do
- * if( floyd ) raw_rowbuf[fi->col] = ...
- * else raw_rowbuf[col] = ...
- */
- if (dgray <= dred && dgray <= dgreen && dgray <= dblue) { /* -IUW '<=' was '<' */
- raw_rowbuf[col] = l /* + (HAMCODE_CMAP << colbits) */ ;
- pr = pg = pb = l;
- fpr = fpg = fpb = fl;
- }
- else if (dblue <= dred && dblue <= dgreen) {
- raw_rowbuf[col] = b + (HAMCODE_BLUE << colbits);
- pb = b;
- fpb = fb;
- }
- else if (dred <= dgreen) {
- raw_rowbuf[col] = r + (HAMCODE_RED << colbits);
- pr = r;
- fpr = fr;
- }
- else {
- raw_rowbuf[col] = g + (HAMCODE_GREEN << colbits);
- pg = g;
- fpg = fg;
- }
- }
- if (floyd)
- update_floyd_pixel(fi, fpr, fpg, fpb);
- }
- bodysize += encode_row(ofp, raw_rowbuf, cols, nPlanes);
- if (floyd)
- end_floyd_row(fi);
- }
- /* clean up */
- if (table)
- free(table);
- free(raw_rowbuf);
- if (floyd)
- free_floyd(fi);
-
- return bodysize;
- }
-
- /************ 24bit ************/
-
- static long do_24_body ARGS((FILE * ifp, FILE * ofp, int cols, int rows, pixval maxval));
-
- static void ppm_to_24(fp, cols, rows, maxval)
- FILE *fp;
- int cols, rows, maxval;
- {
- int nPlanes;
- long bodysize, oldsize, formsize;
-
- nPlanes = 24;
-
- bodysize = oldsize = rows * nPlanes * RowBytes(cols);
- if (DO_COMPRESS) {
- alloc_body_array(rows, nPlanes);
- bodysize = do_24_body(fp, NULL, cols, rows, maxval);
- if (bodysize > oldsize)
- pm_message("warning - %s compression increases BODY size by %d%%", cmpNAME[compr_type], 100 * (bodysize - oldsize) / oldsize);
- else
- pm_message("BODY compression (%s): %d%%", cmpNAME[compr_type], 100 * (oldsize - bodysize) / oldsize);
- }
-
- formsize =
- 4 + /* ILBM */
- 4 + 4 + BitMapHeaderSize + /* BMHD size header */
- CAMGSIZE + /* 0 or CAMG size val */
- 4 + 4 + bodysize + PAD(bodysize); /* BODY size data */
-
- write_form_ilbm(formsize);
- write_bmhd(cols, rows, nPlanes);
- write_camg();
-
- /* write body */
- put_fourchars("BODY");
- put_big_long(bodysize);
- if (DO_COMPRESS)
- write_body();
- else
- do_24_body(fp, stdout, cols, rows, maxval);
- if (odd(bodysize))
- put_byte(0);
- }
-
- static long do_24_body(ifp, ofp, cols, rows, maxval)
- FILE *ifp, *ofp;
- int cols, rows;
- pixval maxval;
- {
- register int row, col;
- pixel *pP;
- pixval *table = NULL;
- long bodysize = 0;
- rawtype *redbuf, *greenbuf, *bluebuf;
-
- redbuf = MALLOC(cols, rawtype);
- greenbuf = MALLOC(cols, rawtype);
- bluebuf = MALLOC(cols, rawtype);
-
- if (maxval != MAXCOLVAL) {
- pm_message("maxval is not %d - automatically rescaling colors", MAXCOLVAL);
- table = make_val_table(maxval, MAXCOLVAL);
- }
-
- for (row = 0; row < rows; row++) {
- pP = next_pixrow(ifp, row);
- if (table) {
- for (col = 0; col < cols; col++, pP++) {
- redbuf[col] = table[PPM_GETR(*pP)];
- greenbuf[col] = table[PPM_GETG(*pP)];
- bluebuf[col] = table[PPM_GETB(*pP)];
- }
- }
- else {
- for (col = 0; col < cols; col++, pP++) {
- redbuf[col] = PPM_GETR(*pP);
- greenbuf[col] = PPM_GETG(*pP);
- bluebuf[col] = PPM_GETB(*pP);
- }
- }
- bodysize += encode_row(ofp, redbuf, cols, 8);
- bodysize += encode_row(ofp, greenbuf, cols, 8);
- bodysize += encode_row(ofp, bluebuf, cols, 8);
- }
- /* clean up */
- if (table)
- free(table);
- free(redbuf);
- free(greenbuf);
- free(bluebuf);
-
- return bodysize;
- }
-
- /************ direct color ************/
-
- static long do_direct_body ARGS((FILE * ifp, FILE * ofp, int cols, int rows, pixval maxval, DirectColor * dcol));
-
- static void ppm_to_direct(fp, cols, rows, maxval, dcol)
- FILE *fp;
- int cols, rows, maxval;
- DirectColor *dcol;
- {
- int nPlanes;
- long formsize, bodysize, oldsize;
-
- nPlanes = dcol->r + dcol->g + dcol->b;
-
- bodysize = oldsize = rows * nPlanes * RowBytes(cols);
- if (DO_COMPRESS) {
- alloc_body_array(rows, nPlanes);
- bodysize = do_direct_body(fp, NULL, cols, rows, maxval, dcol);
- if (bodysize > oldsize)
- pm_message("warning - %s compression increases BODY size by %d%%", cmpNAME[compr_type], 100 * (bodysize - oldsize) / oldsize);
- else
- pm_message("BODY compression (%s): %d%%", cmpNAME[compr_type], 100 * (oldsize - bodysize) / oldsize);
- }
-
- formsize =
- 4 + /* ILBM */
- 4 + 4 + BitMapHeaderSize + /* BMHD size header */
- CAMGSIZE + /* 0 or CAMG size val */
- 4 + 4 + DirectColorSize + /* DCOL size description */
- 4 + 4 + bodysize + PAD(bodysize); /* BODY size data */
-
- write_form_ilbm(formsize);
- write_bmhd(cols, rows, nPlanes);
- write_camg();
-
- /* write DCOL */
- put_fourchars("DCOL");
- put_big_long(DirectColorSize);
- put_byte(dcol->r);
- put_byte(dcol->g);
- put_byte(dcol->b);
- put_byte(0); /* pad */
-
- /* write body */
- put_fourchars("BODY");
- put_big_long(bodysize);
- if (DO_COMPRESS)
- write_body();
- else
- do_direct_body(fp, stdout, cols, rows, maxval, dcol);
- if (odd(bodysize))
- put_byte(0);
- }
-
- static long do_direct_body(ifp, ofp, cols, rows, maxval, dcol)
- FILE *ifp, *ofp;
- int cols, rows;
- pixval maxval;
- DirectColor *dcol;
- {
- register int row, col;
- pixel *pP;
- pixval *redtable = NULL, *greentable = NULL, *bluetable = NULL;
- pixval redmaxval, greenmaxval, bluemaxval;
- rawtype *redbuf, *greenbuf, *bluebuf;
- long bodysize = 0;
-
- redbuf = MALLOC(cols, rawtype);
- greenbuf = MALLOC(cols, rawtype);
- bluebuf = MALLOC(cols, rawtype);
-
- redmaxval = pm_bitstomaxval(dcol->r);
- if (redmaxval != maxval) {
- pm_message("rescaling reds to %d bits", dcol->r);
- redtable = make_val_table(maxval, redmaxval);
- }
- greenmaxval = pm_bitstomaxval(dcol->g);
- if (greenmaxval != maxval) {
- pm_message("rescaling greens to %d bits", dcol->g);
- greentable = make_val_table(maxval, greenmaxval);
- }
- bluemaxval = pm_bitstomaxval(dcol->b);
- if (bluemaxval != maxval) {
- pm_message("rescaling blues to %d bits", dcol->b);
- bluetable = make_val_table(maxval, bluemaxval);
- }
-
- for (row = 0; row < rows; row++) {
- pP = next_pixrow(ifp, row);
- for (col = 0; col < cols; col++, pP++) {
- register pixval r, g, b;
-
- r = PPM_GETR(*pP);
- if (redtable)
- r = redtable[r];
- g = PPM_GETG(*pP);
- if (greentable)
- g = greentable[g];
- b = PPM_GETB(*pP);
- if (bluetable)
- b = bluetable[b];
-
- redbuf[col] = r;
- greenbuf[col] = g;
- bluebuf[col] = b;
- }
- bodysize += encode_row(ofp, redbuf, cols, dcol->r);
- bodysize += encode_row(ofp, greenbuf, cols, dcol->g);
- bodysize += encode_row(ofp, bluebuf, cols, dcol->b);
- }
- /* clean up */
- if (redtable)
- free(redtable);
- if (greentable)
- free(greentable);
- if (bluetable)
- free(bluetable);
- free(redbuf);
- free(greenbuf);
- free(bluebuf);
-
- return bodysize;
- }
-
- /************ normal colormapped ************/
-
- static long do_std_body ARGS((FILE * ifp, FILE * ofp, int cols, int rows, pixval maxval, colorhist_vector chv, int colors, int nPlanes));
-
- static void ppm_to_std(fp, cols, rows, maxval, chv, colors, nPlanes)
- FILE *fp;
- int cols, rows, maxval;
- colorhist_vector chv;
- int colors, nPlanes;
- {
- long formsize, cmapsize, bodysize, oldsize;
-
- bodysize = oldsize = rows * nPlanes * RowBytes(cols);
- if (DO_COMPRESS) {
- alloc_body_array(rows, nPlanes);
- bodysize = do_std_body(fp, NULL, cols, rows, maxval, chv, colors, nPlanes);
- if (bodysize > oldsize)
- pm_message("warning - %s compression increases BODY size by %d%%", cmpNAME[compr_type], 100 * (bodysize - oldsize) / oldsize);
- else
- pm_message("BODY compression (%s): %d%%", cmpNAME[compr_type], 100 * (oldsize - bodysize) / oldsize);
- }
-
- cmapsize = colors * 3;
-
- formsize =
- 4 + /* ILBM */
- 4 + 4 + BitMapHeaderSize + /* BMHD size header */
- CAMGSIZE + /* 0 or CAMG size val */
- 4 + 4 + cmapsize + PAD(cmapsize) + /* CMAP size colormap */
- 4 + 4 + bodysize + PAD(bodysize); /* BODY size data */
-
- write_form_ilbm(formsize);
- write_bmhd(cols, rows, nPlanes);
- write_camg();
- write_std_cmap(chv, colors, maxval);
-
- /* write body */
- put_fourchars("BODY");
- put_big_long(bodysize);
- if (DO_COMPRESS)
- write_body();
- else
- do_std_body(fp, stdout, cols, rows, maxval, chv, colors, nPlanes);
- if (odd(bodysize))
- put_byte(0);
- }
-
- static long do_std_body(ifp, ofp, cols, rows, maxval, chv, colors, nPlanes)
- FILE *ifp, *ofp;
- int cols, rows;
- pixval maxval;
- colorhist_vector chv;
- int colors, nPlanes;
- {
- colorhash_table cht;
- register int row, col;
- pixel *pP;
- rawtype *raw_rowbuf;
- floydinfo *fi;
- long bodysize = 0;
- short usehash = !savemem;
-
- raw_rowbuf = MALLOC(cols, rawtype);
-
- /* Make a hash table for fast color lookup. */
- cht = ppm_colorhisttocolorhash(chv, colors);
-
- if (floyd)
- fi = init_floyd(cols, maxval, 1);
-
- for (row = 0; row < rows; row++) {
- pP = next_pixrow(ifp, row);
- if (floyd)
- begin_floyd_row(fi, pP);
-
- for (col = 0; col < cols; col++, pP++) {
- int ind;
-
- if (floyd)
- pP = next_floyd_pixel(fi);
-
- /* Check hash table to see if we have already matched this color. */
- ind = ppm_lookupcolor(cht, pP);
- if (ind == -1) {
- ind = closest_color(chv, colors, maxval, pP); /* No; search colormap for closest match. */
- if (usehash) {
- if (ppm_addtocolorhash(cht, pP, ind) < 0) {
- pm_message("out of memory adding to hash table, proceeding without it");
- usehash = 0;
- }
- }
- }
- if (floyd) {
- raw_rowbuf[fi->col] = ind;
- update_floyd_pixel(fi, (int)PPM_GETR(chv[ind].color), (int)PPM_GETG(chv[ind].color), (int)PPM_GETB(chv[ind].color));
- }
- else
- raw_rowbuf[col] = ind;
- }
- if (floyd)
- end_floyd_row(fi);
- bodysize += encode_row(ofp, raw_rowbuf, cols, nPlanes);
- }
- /* clean up */
- free(raw_rowbuf);
- ppm_freecolorhash(cht);
- if (floyd)
- free_floyd(fi);
-
- return bodysize;
- }
-
- /************ multipalette ************/
-
- #ifdef ILBM_PCHG
- static pixel *ppmslice[2]; /* need 2 for laced ILBMs, else 1 */
-
- void ppm_to_pchg()
- {
- /*
- * read first slice
- * build a colormap from this slice
- * select upto <maxcolors> colors
- * build colormap from selected colors
- * map slice to colormap
- * write slice
- * while( !finished ) {
- * read next slice
- * compute distances for each pixel and select upto
- * <maxchangesperslice> unused colors in this slice
- * modify selected colors to the ones with maximum(?) distance
- * map slice to colormap
- * write slice
- * }
- *
- *
- * for HAM use a different mapping:
- * compute distance to closest color in colormap
- * if( there is no matching color in colormap ) {
- * compute distances for the three "modify" cases
- * use the shortest distance from the four cases
- * }
- */
- }
-
- #endif
-
- /************ ILBM functions ************/
-
- static void write_std_cmap(chv, colors, maxval)
- colorhist_vector chv;
- int colors, maxval;
- {
- int cmapsize, i;
-
- cmapsize = 3 * colors;
-
- /* write colormap */
- put_fourchars("CMAP");
- put_big_long(cmapsize);
- if (maxval != MAXCOLVAL) {
- pixval *table;
-
- pm_message("maxval is not %d - automatically rescaling colors", MAXCOLVAL);
- table = make_val_table(maxval, MAXCOLVAL);
- for (i = 0; i < colors; i++) {
- put_byte(table[PPM_GETR(chv[i].color)]);
- put_byte(table[PPM_GETG(chv[i].color)]);
- put_byte(table[PPM_GETB(chv[i].color)]);
- }
- free(table);
- }
- else {
- for (i = 0; i < colors; i++) {
- put_byte(PPM_GETR(chv[i].color));
- put_byte(PPM_GETG(chv[i].color));
- put_byte(PPM_GETB(chv[i].color));
- }
- }
- if (odd(cmapsize))
- put_byte(0);
- }
-
- static void write_form_ilbm(size)
- int size;
- {
- put_fourchars("FORM");
- put_big_long(size);
- put_fourchars("ILBM");
- }
-
- static void write_bmhd(cols, rows, nPlanes)
- int cols, rows, nPlanes;
- {
- unsigned int xasp = 10, yasp = 10;
-
- if (viewportmodes & vmLACE)
- xasp *= 2;
- if (viewportmodes & vmHIRES)
- yasp *= 2;
-
- put_fourchars("BMHD");
- put_big_long(BitMapHeaderSize);
-
- put_big_short(cols);
- put_big_short(rows);
- put_big_short(0); /* x-offset */
- put_big_short(0); /* y-offset */
- put_byte(nPlanes); /* no of planes */
- put_byte(mskNone); /* masking type */
- put_byte((unsigned char)compr_type); /* compression type */
- put_byte(0); /* pad1 */
- put_big_short(0); /* tranparentColor */
- put_byte(xasp); /* x-aspect */
- put_byte(yasp); /* y-aspect */
- put_big_short(cols); /* pageWidth */
- put_big_short(rows); /* pageHeight */
- }
-
- /* encode algorithm by Johan Widen (jw@jwdata.se) */
- const unsigned char ppmtoilbm_bitmask[] =
- {1, 2, 4, 8, 16, 32, 64, 128};
-
- static int encode_row(outfile, rawrow, cols, nPlanes)
- FILE *outfile; /* if non-NULL, write uncompressed row to this file */
- rawtype *rawrow;
- int cols, nPlanes;
- {
- int plane, bytes;
- long retbytes = 0;
-
- bytes = RowBytes(cols);
-
- /* Encode and write raw bytes in plane-interleaved form. */
- for (plane = 0; plane < nPlanes; plane++) {
- register int col, cbit;
- register rawtype *rp;
- register unsigned char *cp;
- int mask;
-
- mask = 1 << plane;
- cbit = -1;
- cp = coded_rowbuf - 1;
- rp = rawrow;
- for (col = 0; col < cols; col++, cbit--, rp++) {
- if (cbit < 0) {
- cbit = 7;
- *++cp = 0;
- }
- if (*rp & mask)
- *cp |= ppmtoilbm_bitmask[cbit];
- }
- if (outfile) {
- retbytes += bytes;
- if (fwrite(coded_rowbuf, 1, bytes, stdout) != bytes)
- pm_error("write error");
- }
- else
- retbytes += compress_row(bytes);
- }
- return retbytes;
- }
-
- static int compress_row(bytes)
- int bytes;
- {
- static int count;
- int newbytes;
-
- /* if new compression methods are defined, do a switch here */
- newbytes = runbyte1(bytes);
-
- if (savemem) {
- ilbm_body[count].row = MALLOC(newbytes, unsigned char);
-
- bcopy(compr_rowbuf, ilbm_body[count].row, newbytes);
- }
- else {
- ilbm_body[count].row = compr_rowbuf;
- compr_rowbuf = MALLOC(WORSTCOMPR(bytes), unsigned char);
- }
- ilbm_body[count].len = newbytes;
- ++count;
-
- return newbytes;
- }
-
- static void
- write_body ARGS((void))
- {
- bodyrow *p;
-
- for (p = ilbm_body; p->row != NULL; p++) {
- if (fwrite(p->row, 1, p->len, stdout) != p->len)
- pm_error("write error");
- }
- /* pad byte (if neccessary) is written by do_xxx_body() function */
- }
-
- static void
- write_camg ARGS((void))
- {
- if (viewportmodes) {
- put_fourchars("CAMG");
- put_big_long(CAMGChunkSize);
- put_big_long(viewportmodes);
- }
- }
-
- /************ compression ************/
-
- /* runbyte1 algorithm by Robert A. Knop (rknop@mop.caltech.edu) */
- static int runbyte1(size)
- int size;
- {
- int in, out, count, hold;
- register unsigned char *inbuf = coded_rowbuf;
- register unsigned char *outbuf = compr_rowbuf;
-
- in = out = 0;
- while (in < size) {
- if ((in < size - 1) && (inbuf[in] == inbuf[in + 1])) { /*Begin replicate run */
- for (count = 0, hold = in; in < size && inbuf[in] == inbuf[hold] && count < 128; in++, count++);
- outbuf[out++] = (unsigned char)(char)(-count + 1);
- outbuf[out++] = inbuf[hold];
- }
- else { /*Do a literal run */
- hold = out;
- out++;
- count = 0;
- while (((in >= size - 2) && (in < size)) || ((in < size - 2) && ((inbuf[in] != inbuf[in + 1]) || (inbuf[in] != inbuf[in + 2])))) {
- outbuf[out++] = inbuf[in++];
- if (++count >= 128)
- break;
- }
- outbuf[hold] = count - 1;
- }
- }
- return (out);
- }
-
- /************ PPM functions ************/
-
- static int closest_color(chv, colors, cmaxval, pP)
- colorhist_vector chv;
- int colors;
- pixval cmaxval;
- pixel *pP;
- {
- /* Search colormap for closest match. */
- /* algorithm taken from ppmquant.c -IUW */
- register int i, r1, g1, b1;
- int ind;
- long dist;
-
- r1 = PPM_GETR(*pP);
- g1 = PPM_GETG(*pP);
- b1 = PPM_GETB(*pP);
- dist = 2000000000;
- for (i = 0; i < colors; i++) {
- register int r2, g2, b2;
- long newdist;
-
- r2 = PPM_GETR(chv[i].color);
- g2 = PPM_GETG(chv[i].color);
- b2 = PPM_GETB(chv[i].color);
- newdist = (r1 - r2) * (r1 - r2) +
- (g1 - g2) * (g1 - g2) +
- (b1 - b2) * (b1 - b2);
-
- if (newdist < dist) {
- ind = i;
- dist = newdist;
- }
- }
- return ind;
- }
-
- /************ floyd-steinberg error diffusion ************/
-
- static floydinfo *
- init_floyd(cols, maxval, alternate)
- int cols;
- pixval maxval;
- int alternate;
- {
- register int i;
- floydinfo *fi;
-
- fi = MALLOC(1, floydinfo);
-
- fi->thisrederr = MALLOC(cols + 2, long);
- fi->thisgreenerr = MALLOC(cols + 2, long);
- fi->thisblueerr = MALLOC(cols + 2, long);
- fi->nextrederr = MALLOC(cols + 2, long);
- fi->nextgreenerr = MALLOC(cols + 2, long);
- fi->nextblueerr = MALLOC(cols + 2, long);
-
- fi->lefttoright = 1;
- fi->cols = cols;
- fi->maxval = maxval;
- fi->alternate = alternate;
-
- for (i = 0; i < cols + 2; i++)
- fi->thisrederr[i] = fi->thisgreenerr[i] = fi->thisblueerr[i] = 0;
-
- return fi;
- }
-
- static void free_floyd(fi)
- floydinfo *fi;
- {
- free(fi->thisrederr);
- free(fi->thisgreenerr);
- free(fi->thisblueerr);
- free(fi->nextrederr);
- free(fi->nextgreenerr);
- free(fi->nextblueerr);
- free(fi);
- }
-
- static void begin_floyd_row(fi, prow)
- floydinfo *fi;
- pixel *prow;
- {
- register int i;
-
- fi->pixrow = prow;
-
- for (i = 0; i < fi->cols + 2; i++)
- fi->nextrederr[i] = fi->nextgreenerr[i] = fi->nextblueerr[i] = 0;
-
- if (fi->lefttoright) {
- fi->col = 0;
- fi->col_end = fi->cols;
- }
- else {
- fi->col = fi->cols - 1;
- fi->col_end = -1;
- }
- }
-
- #define FS_GREEN_WEIGHT 1
- #define FS_RED_WEIGHT 2 /* luminance of component relative to green */
- #define FS_BLUE_WEIGHT 5
-
- static pixel *
- next_floyd_pixel(fi)
- floydinfo *fi;
- {
- register long r, g, b;
- register pixel *pP;
- int errcol = fi->col + 1;
- pixval maxval = fi->maxval;
-
- #ifdef DEBUG
- if (fi->col == fi->col_end)
- pm_error("fs - access out of array bounds"); /* should never happen */
- #endif
-
- pP = &(fi->pixrow[fi->col]);
-
- /* Use Floyd-Steinberg errors to adjust actual color. */
- r = fi->thisrederr[errcol];
- if (r < 0)
- r -= 8;
- else
- r += 8;
- r /= 16;
- g = fi->thisgreenerr[errcol];
- if (g < 0)
- g -= 8;
- else
- g += 8;
- g /= 16;
- b = fi->thisblueerr[errcol];
- if (b < 0)
- b -= 8;
- else
- b += 8;
- b /= 16;
-
- if (floyd == 2) { /* EXPERIMENTAL */
- r /= FS_RED_WEIGHT;
- b /= FS_BLUE_WEIGHT;
- }
-
- r += PPM_GETR(*pP);
- if (r < 0)
- r = 0;
- else if (r > maxval)
- r = maxval;
- g += PPM_GETG(*pP);
- if (g < 0)
- g = 0;
- else if (g > maxval)
- g = maxval;
- b += PPM_GETB(*pP);
- if (b < 0)
- b = 0;
- else if (b > maxval)
- b = maxval;
-
- PPM_ASSIGN(*pP, r, g, b);
-
- fi->red = r;
- fi->green = g;
- fi->blue = b;
-
- return pP;
- }
-
- static void update_floyd_pixel(fi, r, g, b)
- floydinfo *fi;
- int r, g, b;
- {
- register long rerr, gerr, berr, err;
- int col = fi->col;
- int errcol = col + 1;
- long two_err;
-
- rerr = (long)(fi->red) - r;
- gerr = (long)(fi->green) - g;
- berr = (long)(fi->blue) - b;
-
- if (fi->lefttoright) {
- two_err = 2 * rerr;
- err = rerr;
- fi->nextrederr[errcol + 1] += err; /* 1/16 */
- err += two_err;
- fi->nextrederr[errcol - 1] += err; /* 3/16 */
- err += two_err;
- fi->nextrederr[errcol] += err; /* 5/16 */
- err += two_err;
- fi->thisrederr[errcol + 1] += err; /* 7/16 */
-
- two_err = 2 * gerr;
- err = gerr;
- fi->nextgreenerr[errcol + 1] += err; /* 1/16 */
- err += two_err;
- fi->nextgreenerr[errcol - 1] += err; /* 3/16 */
- err += two_err;
- fi->nextgreenerr[errcol] += err; /* 5/16 */
- err += two_err;
- fi->thisgreenerr[errcol + 1] += err; /* 7/16 */
-
- two_err = 2 * berr;
- err = berr;
- fi->nextblueerr[errcol + 1] += err; /* 1/16 */
- err += two_err;
- fi->nextblueerr[errcol - 1] += err; /* 3/16 */
- err += two_err;
- fi->nextblueerr[errcol] += err; /* 5/16 */
- err += two_err;
- fi->thisblueerr[errcol + 1] += err; /* 7/16 */
-
- fi->col++;
- }
- else {
- two_err = 2 * rerr;
- err = rerr;
- fi->nextrederr[errcol - 1] += err; /* 1/16 */
- err += two_err;
- fi->nextrederr[errcol + 1] += err; /* 3/16 */
- err += two_err;
- fi->nextrederr[errcol] += err; /* 5/16 */
- err += two_err;
- fi->thisrederr[errcol - 1] += err; /* 7/16 */
-
- two_err = 2 * gerr;
- err = gerr;
- fi->nextgreenerr[errcol - 1] += err; /* 1/16 */
- err += two_err;
- fi->nextgreenerr[errcol + 1] += err; /* 3/16 */
- err += two_err;
- fi->nextgreenerr[errcol] += err; /* 5/16 */
- err += two_err;
- fi->thisgreenerr[errcol - 1] += err; /* 7/16 */
-
- two_err = 2 * berr;
- err = berr;
- fi->nextblueerr[errcol - 1] += err; /* 1/16 */
- err += two_err;
- fi->nextblueerr[errcol + 1] += err; /* 3/16 */
- err += two_err;
- fi->nextblueerr[errcol] += err; /* 5/16 */
- err += two_err;
- fi->thisblueerr[errcol - 1] += err; /* 7/16 */
-
- fi->col--;
- }
- }
-
- static void end_floyd_row(fi)
- floydinfo *fi;
- {
- long *tmp;
-
- tmp = fi->thisrederr;
- fi->thisrederr = fi->nextrederr;
- fi->nextrederr = tmp;
- tmp = fi->thisgreenerr;
- fi->thisgreenerr = fi->nextgreenerr;
- fi->nextgreenerr = tmp;
- tmp = fi->thisblueerr;
- fi->thisblueerr = fi->nextblueerr;
- fi->nextblueerr = tmp;
- if (fi->alternate)
- fi->lefttoright = !(fi->lefttoright);
- }
-
- /************ other utility functions ************/
-
- static void alloc_body_array(rows, nPlanes)
- int rows, nPlanes;
- {
- ilbm_body = MALLOC(rows * nPlanes + 1, bodyrow);
- ilbm_body[rows * nPlanes].row = NULL;
- }
-
- static int colorstobpp(colors)
- int colors;
- {
- int i;
-
- for (i = 1; i <= MAXPLANES; i++) {
- if (colors <= (1 << i))
- return i;
- }
- pm_error("too many planes (max %d)", MAXPLANES);
- /*NOTREACHED */
- }
-
- static void put_big_short(s)
- short s;
- {
- if (pm_writebigshort(stdout, s) == -1)
- pm_error("write error");
- }
-
- static void put_big_long(l)
- long l;
- {
- if (pm_writebiglong(stdout, l) == -1)
- pm_error("write error");
- }
-
- static pixval *
- make_val_table(oldmaxval, newmaxval)
- pixval oldmaxval, newmaxval;
- {
- int i;
- pixval *table;
-
- table = MALLOC(oldmaxval + 1, pixval);
- for (i = 0; i <= oldmaxval; i++)
- table[i] = (i * newmaxval + oldmaxval / 2) / oldmaxval;
-
- return table;
- }
-
- static void *
- xmalloc(bytes)
- int bytes;
- {
- void *mem;
-
- mem = malloc(bytes);
- if (mem == NULL)
- pm_error("out of memory allocating %d bytes", bytes);
- return mem;
- }
-
- static int gFormat;
- static int gCols;
- static int gMaxval;
-
- static void init_read(fp, colsP, rowsP, maxvalP, formatP, readall)
- FILE *fp;
- int *colsP, *rowsP;
- pixval *maxvalP;
- int *formatP;
- int readall;
- {
- ppm_readppminit(fp, colsP, rowsP, maxvalP, formatP);
- if (readall) {
- int row;
-
- pixels = ppm_allocarray(*colsP, *rowsP);
- for (row = 0; row < *rowsP; row++)
- ppm_readppmrow(fp, pixels[row], *colsP, *maxvalP, *formatP);
- /* pixels = ppm_readppm(fp, colsP, rowsP, maxvalP); */
- }
- else {
- pixrow = ppm_allocrow(*colsP);
- }
- gCols = *colsP;
- gMaxval = *maxvalP;
- gFormat = *formatP;
- }
-
- static pixel *
- next_pixrow(fp, row)
- FILE *fp;
- int row;
- {
- if (pixels)
- pixrow = pixels[row];
- else {
- #ifdef DEBUG
- static int rowcnt;
-
- if (row != rowcnt)
- pm_error("big mistake");
- rowcnt++;
- #endif
- ppm_readppmrow(fp, pixrow, gCols, gMaxval, gFormat);
- }
- return pixrow;
- }
-