diff options
Diffstat (limited to 'converter/ppm/ppmtogif.c')
| -rw-r--r-- | converter/ppm/ppmtogif.c | 1571 |
1 files changed, 214 insertions, 1357 deletions
diff --git a/converter/ppm/ppmtogif.c b/converter/ppm/ppmtogif.c index 21ac1989..93feaa95 100644 --- a/converter/ppm/ppmtogif.c +++ b/converter/ppm/ppmtogif.c @@ -1,101 +1,63 @@ -/* ppmtogif.c - read a portable pixmap and produce a GIF file -** -** Based on GIFENCOD by David Rowley <mgardi@watdscu.waterloo.edu>.A -** Lempel-Zim compression based on "compress". -** -** Modified by Marcel Wijkstra <wijkstra@fwi.uva.nl> -** -** The non-LZW GIF generation stuff was adapted from the Independent -** JPEG Group's djpeg on 2001.09.29. The uncompressed output subroutines -** are derived directly from the corresponding subroutines in djpeg's -** wrgif.c source file. Its copyright notice say: - - * Copyright (C) 1991-1997, Thomas G. Lane. - * This file is part of the Independent JPEG Group's software. - * For conditions of distribution and use, see the accompanying README file. - * - The reference README file is README.JPEG in the Netpbm package. -** -** 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. -** -** The Graphics Interchange Format(c) is the Copyright property of -** CompuServe Incorporated. GIF(sm) is a Service Mark property of -** CompuServe Incorporated. -*/ +/* This is a backward compatibility interface to Pamtogif. + + Pamtogif replaced Ppmtogif in Netpbm 10.37 (December 2006). + + The only significant ways Pamtogif are not backward compatible with + old Ppmtogif are: -/* TODO: merge the LZW and uncompressed subroutines. They are separate - only because they had two different lineages and the code is too - complicated for me quickly to rewrite it. + - Pamtogif does not have a -alpha option. + + - Pamtogif requires a user-specififed map file (-mapfile) to + match the input in depth. */ +#define _BSD_SOURCE /* Make sure strdup() is in string.h */ +#define _XOPEN_SOURCE 500 /* Make sure strdup() is in string.h */ + #include <assert.h> #include <string.h> +#include <stdio.h> +#include <sys/stat.h> +#include <unistd.h> +#include "pm_c_util.h" #include "mallocvar.h" #include "shhopt.h" -#include "ppm.h" +#include "nstring.h" +#include "pam.h" -#define MAXCMAPSIZE 256 -static unsigned int const gifMaxval = 255; -static bool verbose; -/* - * a code_int must be able to hold 2**BITS values of type int, and also -1 - */ -typedef int code_int; +static const char * +dirname(const char * const fileName) { -typedef long int count_int; + char * buffer; + char * slashPos; + buffer = strdup(fileName); + + slashPos = strchr(buffer, '/'); + + if (slashPos) + *slashPos = '\0'; + + return buffer; +} -struct cmap { - /* This is the information for the GIF colormap (aka palette). */ - int red[MAXCMAPSIZE], green[MAXCMAPSIZE], blue[MAXCMAPSIZE]; - /* These arrays arrays map a color index, as is found in - the raster part of the GIF, to an intensity value for the indicated - RGB component. - */ - int perm[MAXCMAPSIZE], permi[MAXCMAPSIZE]; - /* perm[i] is the position in the sorted colormap of the color which - is at position i in the unsorted colormap. permi[] is the inverse - function of perm[]. - */ - int cmapsize; - /* Number of entries in the GIF colormap. I.e. number of colors - in the image, plus possibly one fake transparency color. - */ - int transparent; - /* color index number in GIF palette of the color that is to be - transparent. -1 if no color is transparent. - */ - colorhash_table cht; - /* A hash table that relates a PPM pixel value to to a pre-sort - GIF colormap index. - */ - pixval maxval; - /* The maxval for the colors in 'cht'. */ -}; struct cmdlineInfo { /* All the information the user supplied in the command line, in a form easy for the program to use. */ - const char *input_filespec; /* Filespec of input file */ - const char *alpha_filespec; /* Filespec of alpha file; NULL if none */ - const char *alphacolor; /* -alphacolor option value or default */ - unsigned int interlace; /* -interlace option value */ - unsigned int sort; /* -sort option value */ + const char *inputFileName; /* Name of input file */ + const char *alpha_filespec; /* Filespec of alpha file; NULL if none */ + const char *alphacolor; /* -alphacolor option value or default */ + unsigned int interlace; /* -interlace option value */ + unsigned int sort; /* -sort option value */ const char *mapfile; /* -mapfile option value. NULL if none. */ const char *transparent; /* -transparent option value. NULL if none. */ const char *comment; /* -comment option value; NULL if none */ - unsigned int nolzw; /* -nolzw option */ + unsigned int nolzw; /* -nolzw option */ unsigned int verbose; }; @@ -122,8 +84,8 @@ handleLatex2htmlHack(void) { -Bryan 2001.11.14 -----------------------------------------------------------------------------*/ pm_error("latex2html, you should just try the -interlace and " - "-transparent options to see if they work instead of " - "expecting a 'usage' message from -h"); + "-transparent options to see if they work instead of " + "expecting a 'usage' message from -h"); } @@ -191,12 +153,12 @@ parseCommandLine(int argc, char ** argv, handleLatex2htmlHack(); if (argc-1 == 0) - cmdlineP->input_filespec = "-"; + cmdlineP->inputFileName = "-"; else if (argc-1 != 1) pm_error("Program takes zero or one argument (filename). You " "specified %d", argc-1); else - cmdlineP->input_filespec = argv[1]; + cmdlineP->inputFileName = argv[1]; if (cmdlineP->alpha_filespec && cmdlineP->transparent) pm_error("You cannot specify both -alpha and -transparent."); @@ -204,1362 +166,257 @@ parseCommandLine(int argc, char ** argv, -/* - * Write out a word to the GIF file - */ static void -Putword(int const w, FILE * const fp) { - - fputc( w & 0xff, fp ); - fputc( (w / 256) & 0xff, fp ); -} - - -static int -closestcolor(pixel const color, - pixval const maxval, - struct cmap * const cmapP) { +openPnmremapStream(const char * const inputFileName, + const char * const mapFileName, + bool const verbose, + FILE ** const pnmremapPipeP) { /*---------------------------------------------------------------------------- - Return the pre-sort colormap index of the color in the colormap *cmapP - that is closest to the color 'color', whose maxval is 'maxval'. - - Also add 'color' to the colormap hash, with the colormap index we - are returning. Caller must ensure that the color is not already in - there. + Create a process to run the image in file inputFileName[] through + Pnmremap, remapping it to the colors in mapFileName[]. Have it + write its output to a pipe and return as *pnmremapPipeP the other + end of that pipe. -----------------------------------------------------------------------------*/ - unsigned int i; - unsigned int imin, dmin; - - pixval const r = PPM_GETR(color) * gifMaxval / maxval; - pixval const g = PPM_GETG(color) * gifMaxval / maxval; - pixval const b = PPM_GETB(color) * gifMaxval / maxval; - - dmin = SQR(255) * 3; - imin = 0; - for (i=0;i < cmapP->cmapsize; i++) { - int const d = SQR(r-cmapP->red[i]) + - SQR(g-cmapP->green[i]) + - SQR(b-cmapP->blue[i]); - if (d < dmin) { - dmin = d; - imin = i; - } - } - ppm_addtocolorhash(cmapP->cht, &color, cmapP->permi[imin]); - - return cmapP->permi[imin]; -} - + FILE * pnmremapPipe; + const char * pnmremapCommand; + assert(inputFileName != NULL); + assert(mapFileName != NULL); -enum pass {MULT8PLUS0, MULT8PLUS4, MULT4PLUS2, MULT2PLUS1}; - - -struct pixelCursor { - unsigned int width; - /* Width of the image, in columns */ - unsigned int height; - /* Height of the image, in rows */ - bool interlace; - /* We're accessing the image in interlace fashion */ - unsigned int nPixelsLeft; - /* Number of pixels left to be read */ - unsigned int curCol; - /* Location of pointed-to pixel, column */ - unsigned int curRow; - /* Location of pointed-to pixel, row */ - enum pass pass; - /* The interlace pass. Undefined if !interlace */ -}; + asprintfN(&pnmremapCommand, "pnmremap -mapfile='%s' %s", + mapFileName, inputFileName); + if (verbose) + pm_message("Preprocessing Pamtogif input with shell command '%s'", + pnmremapCommand); + pnmremapPipe = popen(pnmremapCommand, "r"); -static struct pixelCursor pixelCursor; - /* Current location in the input pixels. */ - + if (pnmremapPipe == NULL) + pm_error("Shell command '%s', via popen(), to prepare the input " + "for Pamtogif, failed.", pnmremapCommand); + else + *pnmremapPipeP = pnmremapPipe; -static void -initPixelCursor(unsigned int const width, - unsigned int const height, - bool const interlace) { - - pixelCursor.width = width; - pixelCursor.height = height; - pixelCursor.interlace = interlace; - pixelCursor.pass = MULT8PLUS0; - pixelCursor.curCol = 0; - pixelCursor.curRow = 0; - pixelCursor.nPixelsLeft = width * height; + strfree(pnmremapCommand); } -static void -getPixel(pixel ** const pixels, - pixval const inputMaxval, - gray ** const alpha, - gray const alphaThreshold, - struct cmap * const cmapP, - struct pixelCursor const pixelCursor, - int * const retvalP) { -/*---------------------------------------------------------------------------- - Return as *retvalP the colormap index of the pixel at location - pointed to by 'pixelCursor' in the PPM raster 'pixels', using - colormap *cmapP. ------------------------------------------------------------------------------*/ - unsigned int const x = pixelCursor.curCol; - unsigned int const y = pixelCursor.curRow; +static const char * +pamtogifCommand(const char * const arg0, + struct cmdlineInfo const cmdline) { - int colorindex; + const char * const pamtogifName = "pamtogif"; - if (alpha && alpha[y][x] < alphaThreshold) - colorindex = cmapP->transparent; - else { - int presortColorindex; + const char * retval; - presortColorindex = ppm_lookupcolor(cmapP->cht, &pixels[y][x]); - if (presortColorindex == -1) - presortColorindex = - closestcolor(pixels[y][x], inputMaxval, cmapP); - colorindex = cmapP->perm[presortColorindex]; - } - *retvalP = colorindex; -} + const char * commandVerb; + const char * transparentOpt; + const char * commentOpt; + if (strchr(arg0, '/')) { + const char * const arg0DirName = dirname(arg0); + const char * progName; + struct stat statbuf; -static void -bumpRowInterlace(struct pixelCursor * const pixelCursorP) { -/*---------------------------------------------------------------------------- - Move *pixelCursorP to the next row in the interlace pattern. ------------------------------------------------------------------------------*/ - /* There are 4 passes: - MULT8PLUS0: Rows 8, 16, 24, 32, etc. - MULT8PLUS4: Rows 4, 12, 20, 28, etc. - MULT4PLUS2: Rows 2, 6, 10, 14, etc. - MULT2PLUS1: Rows 1, 3, 5, 7, 9, etc. - */ - - switch (pixelCursorP->pass) { - case MULT8PLUS0: - pixelCursorP->curRow += 8; - break; - case MULT8PLUS4: - pixelCursorP->curRow += 8; - break; - case MULT4PLUS2: - pixelCursorP->curRow += 4; - break; - case MULT2PLUS1: - pixelCursorP->curRow += 2; - break; - } - /* Set the proper pass for the next read. Note that if there are - more than 4 rows, the sequence of passes is sequential, but - when there are fewer than 4, we may skip e.g. from MULT8PLUS0 - to MULT4PLUS2. - */ - while (pixelCursorP->curRow >= pixelCursorP->height) { - switch (pixelCursorP->pass) { - case MULT8PLUS0: - pixelCursorP->pass = MULT8PLUS4; - pixelCursorP->curRow = 4; - break; - case MULT8PLUS4: - pixelCursorP->pass = MULT4PLUS2; - pixelCursorP->curRow = 2; - break; - case MULT4PLUS2: - pixelCursorP->pass = MULT2PLUS1; - pixelCursorP->curRow = 1; - break; - case MULT2PLUS1: - /* We've read the entire image; pass and current row are - now undefined. - */ - pixelCursorP->curRow = 0; - break; - } - } -} + asprintfN(&progName, "%s/%s", arg0DirName, pamtogifName); - - -static void -bumpPixel(struct pixelCursor * const pixelCursorP) { -/*---------------------------------------------------------------------------- - Bump *pixelCursorP to point to the next pixel to go into the GIF - - Must not call when there are no pixels left. ------------------------------------------------------------------------------*/ - assert(pixelCursorP->nPixelsLeft > 0); - - /* Move one column to the right */ - ++pixelCursorP->curCol; - - if (pixelCursorP->curCol >= pixelCursorP->width) { - /* That pushed us past the end of a row. */ - /* Reset to the left edge ... */ - pixelCursorP->curCol = 0; - - /* ... of the next row */ - if (!pixelCursorP->interlace) - /* Go to the following row */ - ++pixelCursorP->curRow; + if (stat(progName, &statbuf) == 0) + commandVerb = progName; else - bumpRowInterlace(pixelCursorP); - } - --pixelCursorP->nPixelsLeft; -} - - - -static int -gifNextPixel(pixel ** const pixels, - pixval const inputMaxval, - gray ** const alpha, - gray const alphaThreshold, - struct cmap * const cmapP) { -/*---------------------------------------------------------------------------- - Return the pre-sort color index (index into the unsorted GIF color map) - of the next pixel to be processed from the input image. - - 'alpha_threshold' is the gray level such that a pixel in the alpha - map whose value is less that that represents a transparent pixel - in the output. ------------------------------------------------------------------------------*/ - int retval; - - if (pixelCursor.nPixelsLeft == 0 ) - retval = EOF; - else { - getPixel(pixels, inputMaxval, alpha, alphaThreshold, cmapP, - pixelCursor, &retval); - - bumpPixel(&pixelCursor); - } - return retval; -} - - - -static void -write_transparent_color_index_extension(FILE *fp, const int Transparent) { -/*---------------------------------------------------------------------------- - Write out extension for transparent color index. ------------------------------------------------------------------------------*/ - - fputc( '!', fp ); - fputc( 0xf9, fp ); - fputc( 4, fp ); - fputc( 1, fp ); - fputc( 0, fp ); - fputc( 0, fp ); - fputc( Transparent, fp ); - fputc( 0, fp ); -} - - - -static void -write_comment_extension(FILE *fp, const char comment[]) { -/*---------------------------------------------------------------------------- - Write out extension for a comment ------------------------------------------------------------------------------*/ - char *segment; - - fputc('!', fp); /* Identifies an extension */ - fputc(0xfe, fp); /* Identifies a comment */ - - /* Write it out in segments no longer than 255 characters */ - for (segment = (char *) comment; - segment < comment+strlen(comment); - segment += 255) { + commandVerb = strdup(pamtogifName); - const int length_this_segment = MIN(255, strlen(segment)); + strfree(arg0DirName); + } else + commandVerb = strdup(pamtogifName); - fputc(length_this_segment, fp); - - fwrite(segment, 1, length_this_segment, fp); - } - - fputc(0, fp); /* No more comment blocks in this extension */ -} - - - -/*************************************************************************** - * - * GIFCOMPR.C - GIF Image compression routines - * - * Lempel-Ziv compression based on 'compress'. GIF modifications by - * David Rowley (mgardi@watdcsu.waterloo.edu) - * - ***************************************************************************/ - -/* - * General DEFINEs - */ - -#define BITS 12 - -#define HSIZE 5003 /* 80% occupancy */ - -#ifdef NO_UCHAR - typedef char char_type; -#else /*NO_UCHAR*/ - typedef unsigned char char_type; -#endif /*NO_UCHAR*/ - -/* - * - * GIF Image compression - modified 'compress' - * - * Based on: compress.c - File compression ala IEEE Computer, June 1984. - * - * By Authors: Spencer W. Thomas (decvax!harpo!utah-cs!utah-gr!thomas) - * Jim McKie (decvax!mcvax!jim) - * Steve Davies (decvax!vax135!petsd!peora!srd) - * Ken Turkowski (decvax!decwrl!turtlevax!ken) - * James A. Woods (decvax!ihnp4!ames!jaw) - * Joe Orost (decvax!vax135!petsd!joe) - * - */ -#include <ctype.h> - -#define ARGVAL() (*++(*argv) || (--argc && *++argv)) - -static code_int const maxmaxcode = (code_int)1 << BITS; - /* should NEVER generate this code */ -#define MAXCODE(n_bits) (((code_int) 1 << (n_bits)) - 1) - -static long htab [HSIZE]; -static unsigned short codetab [HSIZE]; -#define HashTabOf(i) htab[i] -#define CodeTabOf(i) codetab[i] - -/* - * To save much memory, we overlay the table used by compress() with those - * used by decompress(). The tab_prefix table is the same size and type - * as the codetab. The tab_suffix table needs 2**BITS characters. We - * get this from the beginning of htab. The output stack uses the rest - * of htab, and contains characters. There is plenty of room for any - * possible stack (stack used to be 8000 characters). - */ - -#define tab_prefixof(i) CodeTabOf(i) -#define tab_suffixof(i) ((char_type*)(htab))[i] -#define de_stack ((char_type*)&tab_suffixof((code_int)1<<BITS)) - -static code_int free_ent = 0; /* first unused entry */ - -/* - * block compression parameters -- after all codes are used up, - * and compression rate changes, start over. - */ -static int clear_flg = 0; - -static int offset; -static long int in_count = 1; /* length of input */ -static long int out_count = 0; /* # of codes output (for debugging) */ - -/* - * compress stdin to stdout - * - * Algorithm: use open addressing double hashing (no chaining) on the - * prefix code / next character combination. We do a variant of Knuth's - * algorithm D (vol. 3, sec. 6.4) along with G. Knott's relatively-prime - * secondary probe. Here, the modular division first probe is gives way - * to a faster exclusive-or manipulation. Also do block compression with - * an adaptive reset, whereby the code table is cleared when the compression - * ratio decreases, but after the table fills. The variable-length output - * codes are re-sized at this point, and a special CLEAR code is generated - * for the decompressor. Late addition: construct the table according to - * file size for noticeable speed improvement on small files. Please direct - * questions about this implementation to ames!jaw. - */ - -static int ClearCode; -static int EOFCode; - -/*************************************************************************** -* BYTE OUTPUTTER -***************************************************************************/ - -typedef struct { - FILE * fileP; /* The file to which to output */ - unsigned int count; - /* Number of bytes so far in the current data block */ - unsigned char buffer[256]; - /* The current data block, under construction */ -} byteBuffer; - - - -static byteBuffer * -byteBuffer_create(FILE * const fileP) { - - byteBuffer * byteBufferP; - - MALLOCVAR_NOFAIL(byteBufferP); - - byteBufferP->fileP = fileP; - byteBufferP->count = 0; - - return byteBufferP; -} - - - -static void -byteBuffer_destroy(byteBuffer * const byteBufferP) { - - free(byteBufferP); -} - - - -static void -byteBuffer_flush(byteBuffer * const byteBufferP) { -/*---------------------------------------------------------------------------- - Write the current data block to the output file, then reset the current - data block to empty. ------------------------------------------------------------------------------*/ - if (byteBufferP->count > 0 ) { - if (verbose) - pm_message("Writing %u byte block", byteBufferP->count); - fputc(byteBufferP->count, byteBufferP->fileP); - fwrite(byteBufferP->buffer, 1, byteBufferP->count, byteBufferP->fileP); - byteBufferP->count = 0; - } -} - - - -static void -byteBuffer_flushFile(byteBuffer * const byteBufferP) { - - fflush(byteBufferP->fileP); - - if (ferror(byteBufferP->fileP)) - pm_error("error writing output file"); -} - - - -static void -byteBuffer_out(byteBuffer * const byteBufferP, - unsigned char const c) { -/*---------------------------------------------------------------------------- - Add a byte to the end of the current data block, and if it is now 254 - characters, flush the data block to the output file. ------------------------------------------------------------------------------*/ - byteBufferP->buffer[byteBufferP->count++] = c; - if (byteBufferP->count >= 254) - byteBuffer_flush(byteBufferP); -} - - - -struct gif_dest { - /* This structure controls output of uncompressed GIF raster */ - - byteBuffer * byteBufferP; /* Where the full bytes go */ - - /* State for packing variable-width codes into a bitstream */ - int n_bits; /* current number of bits/code */ - int maxcode; /* maximum code, given n_bits */ - int cur_accum; /* holds bits not yet output */ - int cur_bits; /* # of bits in cur_accum */ - - /* State for GIF code assignment */ - int ClearCode; /* clear code (doesn't change) */ - int EOFCode; /* EOF code (ditto) */ - int code_counter; /* counts output symbols */ -}; - - - -static unsigned long const masks[] = { 0x0000, 0x0001, 0x0003, 0x0007, 0x000F, - 0x001F, 0x003F, 0x007F, 0x00FF, - 0x01FF, 0x03FF, 0x07FF, 0x0FFF, - 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF }; - -typedef struct { - byteBuffer * byteBufferP; - unsigned int initBits; - unsigned int n_bits; /* number of bits/code */ - code_int maxcode; /* maximum code, given n_bits */ - unsigned long curAccum; - int curBits; -} codeBuffer; - - - -static codeBuffer * -codeBuffer_create(FILE * const ofP, - unsigned int const initBits) { - - codeBuffer * codeBufferP; - - MALLOCVAR_NOFAIL(codeBufferP); - - codeBufferP->initBits = initBits; - codeBufferP->n_bits = codeBufferP->initBits; - codeBufferP->maxcode = MAXCODE(codeBufferP->n_bits); - codeBufferP->byteBufferP = byteBuffer_create(ofP); - codeBufferP->curAccum = 0; - codeBufferP->curBits = 0; - - return codeBufferP; -} - - - -static void -codeBuffer_destroy(codeBuffer * const codeBufferP) { - - byteBuffer_destroy(codeBufferP->byteBufferP); - - free(codeBufferP); -} - - - -static void -codeBuffer_output(codeBuffer * const codeBufferP, - code_int const code) { -/*---------------------------------------------------------------------------- - Output one GIF code to the file, through the code buffer. - - The code is represented as n_bits bits in the file -- the lower - n_bits bits of 'code'. - - If the code is EOF, flush the code buffer to the file. - - In some cases, change n_bits and recalculate maxcode to go with it. ------------------------------------------------------------------------------*/ - /* - Algorithm: - Maintain a BITS character long buffer (so that 8 codes will - fit in it exactly). Use the VAX insv instruction to insert each - code in turn. When the buffer fills up empty it and start over. - */ - - codeBufferP->curAccum &= masks[codeBufferP->curBits]; - - if (codeBufferP->curBits > 0) - codeBufferP->curAccum |= ((long)code << codeBufferP->curBits); + if (cmdline.transparent) + asprintfN(&transparentOpt, "-transparent=%s", cmdline.transparent); else - codeBufferP->curAccum = code; - - codeBufferP->curBits += codeBufferP->n_bits; + transparentOpt = strdup(""); - while (codeBufferP->curBits >= 8) { - byteBuffer_out(codeBufferP->byteBufferP, - codeBufferP->curAccum & 0xff); - codeBufferP->curAccum >>= 8; - codeBufferP->curBits -= 8; - } - - if (clear_flg) { - codeBufferP->n_bits = codeBufferP->initBits; - codeBufferP->maxcode = MAXCODE(codeBufferP->n_bits); - clear_flg = 0; - } else if (free_ent > codeBufferP->maxcode) { - /* The next entry is going to be too big for the code size, so - increase it, if possible. - */ - ++codeBufferP->n_bits; - if (codeBufferP->n_bits == BITS) - codeBufferP->maxcode = maxmaxcode; - else - codeBufferP->maxcode = MAXCODE(codeBufferP->n_bits); - } + if (cmdline.comment) + asprintfN(&commentOpt, "-comment=%s", cmdline.comment); + else + commentOpt = strdup(""); + + asprintfN(&retval, "%s - -alphacolor=%s %s %s %s %s %s %s", + commandVerb, + cmdline.alphacolor, + cmdline.interlace ? "-interlace" : "", + cmdline.sort ? "-sort" : "", + transparentOpt, + commentOpt, + cmdline.nolzw ? "-nolzw" : "", + cmdline.verbose ? "-verbose" : ""); - if (code == EOFCode) { - /* We're at EOF. Output the possible partial byte in the buffer */ - if (codeBufferP->curBits > 0) { - byteBuffer_out(codeBufferP->byteBufferP, - codeBufferP->curAccum & 0xff); - codeBufferP->curBits = 0; - } - byteBuffer_flush(codeBufferP->byteBufferP); - - byteBuffer_flushFile(codeBufferP->byteBufferP); - } -} - + strfree(transparentOpt); + strfree(commentOpt); - -static void -cl_hash(long const hsize) { - /* reset code table */ - - long const m1 = -1; - - long * htab_p; - long i; - - htab_p = htab + hsize; /* initial value */ - - i = hsize - 16; - do { /* might use Sys V memset(3) here */ - *(htab_p-16) = m1; - *(htab_p-15) = m1; - *(htab_p-14) = m1; - *(htab_p-13) = m1; - *(htab_p-12) = m1; - *(htab_p-11) = m1; - *(htab_p-10) = m1; - *(htab_p-9) = m1; - *(htab_p-8) = m1; - *(htab_p-7) = m1; - *(htab_p-6) = m1; - *(htab_p-5) = m1; - *(htab_p-4) = m1; - *(htab_p-3) = m1; - *(htab_p-2) = m1; - *(htab_p-1) = m1; - htab_p -= 16; - } while ((i -= 16) >= 0); - - for (i += 16; i > 0; --i) - *--htab_p = m1; + return retval; } static void -cl_block(codeBuffer * const codeBufferP) { -/*---------------------------------------------------------------------------- - Clear out the hash table ------------------------------------------------------------------------------*/ - cl_hash(HSIZE); - free_ent = ClearCode + 2; - clear_flg = 1; +feedPamtogifNoAlpha(struct pam * const inPamP, + FILE * const pipeToPamtogif) { - codeBuffer_output(codeBufferP, (code_int)ClearCode); -} + unsigned int row; + struct pam outPam; + tuple * tuplerow; + tuplerow = pnm_allocpamrow(inPamP); - -static void -write_raster_LZW(pixel ** const pixels, - pixval const input_maxval, - gray ** const alpha, - gray const alpha_maxval, - struct cmap * const cmapP, - int const initBits, - FILE * const ofP) { -/*---------------------------------------------------------------------------- - Write the raster to file 'ofP'. - - The raster to write is 'pixels', which has maxval 'input_maxval', - modified by alpha mask 'alpha', which has maxval 'alpha_maxval'. - - Use the colormap 'cmapP' to generate the raster ('pixels' is - composed of RGB samples; the GIF raster is colormap indices). - - Write the raster using LZW compression. ------------------------------------------------------------------------------*/ - gray const alpha_threshold = (alpha_maxval + 1) / 2; - /* gray levels below this in the alpha mask indicate transparent - pixels in the output image. - */ - code_int ent; - code_int disp; - int hshift; - bool eof; - codeBuffer * codeBufferP; - - codeBufferP = codeBuffer_create(ofP, initBits); + outPam = *inPamP; + outPam.file = pipeToPamtogif; - /* - * Set up the necessary values - */ - offset = 0; - out_count = 0; - clear_flg = 0; - in_count = 1; - - ClearCode = (1 << (initBits - 1)); - EOFCode = ClearCode + 1; - free_ent = ClearCode + 2; - - ent = gifNextPixel(pixels, input_maxval, alpha, alpha_threshold, cmapP); - - { - long fcode; - hshift = 0; - for (fcode = HSIZE; fcode < 65536L; fcode *= 2L) - ++hshift; - hshift = 8 - hshift; /* set hash code range bound */ - } - cl_hash(HSIZE); /* clear hash table */ - - codeBuffer_output(codeBufferP, (code_int)ClearCode); - - eof = FALSE; - while (!eof) { - int gifpixel; - /* The value for the pixel in the GIF image. I.e. the colormap - index. Or -1 to indicate "no more pixels." - */ - gifpixel = gifNextPixel(pixels, - input_maxval, alpha, alpha_threshold, cmapP); - if (gifpixel == EOF) eof = TRUE; - if (!eof) { - long const fcode = (long) (((long) gifpixel << BITS) + ent); - code_int i; - /* xor hashing */ - - ++in_count; - - i = (((code_int)gifpixel << hshift) ^ ent); - - if (HashTabOf (i) == fcode) { - ent = CodeTabOf (i); - continue; - } else if ((long)HashTabOf(i) < 0) /* empty slot */ - goto nomatch; - disp = HSIZE - i; /* secondary hash (after G. Knott) */ - if (i == 0) - disp = 1; - probe: - if ((i -= disp) < 0) - i += HSIZE; - - if (HashTabOf(i) == fcode) { - ent = CodeTabOf(i); - continue; - } - if ((long)HashTabOf(i) > 0) - goto probe; - nomatch: - codeBuffer_output(codeBufferP, (code_int)ent); - ++out_count; - ent = gifpixel; - if (free_ent < maxmaxcode) { - CodeTabOf(i) = free_ent++; /* code -> hashtable */ - HashTabOf(i) = fcode; - } else - cl_block(codeBufferP); - } - } - /* Put out the final code. */ - codeBuffer_output(codeBufferP, (code_int)ent); - ++out_count; - codeBuffer_output(codeBufferP, (code_int) EOFCode); - - codeBuffer_destroy(codeBufferP); -} - + pnm_writepaminit(&outPam); + for (row = 0; row < inPamP->height; ++row) { + pnm_readpamrow(inPamP, tuplerow); -/* Routine to convert variable-width codes into a byte stream */ - -static void -outputUncompressed(struct gif_dest * const dinfoP, - int const code) { - - /* Emit a code of n_bits bits */ - /* Uses cur_accum and cur_bits to reblock into 8-bit bytes */ - dinfoP->cur_accum |= ((int) code) << dinfoP->cur_bits; - dinfoP->cur_bits += dinfoP->n_bits; - - while (dinfoP->cur_bits >= 8) { - byteBuffer_out(dinfoP->byteBufferP, dinfoP->cur_accum & 0xFF); - dinfoP->cur_accum >>= 8; - dinfoP->cur_bits -= 8; - } -} - - -static void -writeRasterUncompressedInit(FILE * const ofP, - struct gif_dest * const dinfoP, - int const i_bits) { -/*---------------------------------------------------------------------------- - Initialize pseudo-compressor ------------------------------------------------------------------------------*/ - - /* init all the state variables */ - dinfoP->n_bits = i_bits; - dinfoP->maxcode = MAXCODE(dinfoP->n_bits); - dinfoP->ClearCode = (1 << (i_bits - 1)); - dinfoP->EOFCode = dinfoP->ClearCode + 1; - dinfoP->code_counter = dinfoP->ClearCode + 2; - /* init output buffering vars */ - dinfoP->byteBufferP = byteBuffer_create(ofP); - dinfoP->cur_accum = 0; - dinfoP->cur_bits = 0; - /* GIF specifies an initial Clear code */ - outputUncompressed(dinfoP, dinfoP->ClearCode); -} - - - -static void -writeRasterUncompressedPixel(struct gif_dest * const dinfoP, - unsigned int const colormapIndex) { -/*---------------------------------------------------------------------------- - "Compress" one pixel value and output it as a symbol. - - 'colormapIndex' must be less than dinfoP->n_bits wide. ------------------------------------------------------------------------------*/ - assert(colormapIndex >> dinfoP->n_bits == 0); - - outputUncompressed(dinfoP, colormapIndex); - /* Issue Clear codes often enough to keep the reader from ratcheting up - * its symbol size. - */ - if (dinfoP->code_counter < dinfoP->maxcode) { - ++dinfoP->code_counter; - } else { - outputUncompressed(dinfoP, dinfoP->ClearCode); - dinfoP->code_counter = dinfoP->ClearCode + 2; /* reset the counter */ + pnm_writepamrow(&outPam, tuplerow); } + pnm_freepamrow(tuplerow); } static void -writeRasterUncompressedTerm(struct gif_dest * const dinfoP) { - - outputUncompressed(dinfoP, dinfoP->EOFCode); - - if (dinfoP->cur_bits > 0) - byteBuffer_out(dinfoP->byteBufferP, dinfoP->cur_accum & 0xFF); - - byteBuffer_flush(dinfoP->byteBufferP); - - byteBuffer_destroy(dinfoP->byteBufferP); -} - - - -static void -writeRasterUncompressed(FILE * const ofP, - pixel ** const pixels, - pixval const inputMaxval, - gray ** const alpha, - gray const alphaMaxval, - struct cmap * const cmapP, - int const initBits) { -/*---------------------------------------------------------------------------- - Write the raster to file 'ofP'. - - Same as write_raster_LZW(), except written out one code per - pixel (plus some clear codes), so no compression. And no use - of the LZW patent. ------------------------------------------------------------------------------*/ - gray const alphaThreshold = (alphaMaxval + 1) / 2; - /* gray levels below this in the alpha mask indicate transparent - pixels in the output image. - */ - bool eof; - - struct gif_dest gifDest; - - writeRasterUncompressedInit(ofP, &gifDest, initBits); - - eof = FALSE; - while (!eof) { - int gifpixel; - /* The value for the pixel in the GIF image. I.e. the colormap - index. Or -1 to indicate "no more pixels." - */ - gifpixel = gifNextPixel(pixels, - inputMaxval, alpha, alphaThreshold, cmapP); - if (gifpixel == EOF) - eof = TRUE; - else - writeRasterUncompressedPixel(&gifDest, gifpixel); - } - writeRasterUncompressedTerm(&gifDest); -} - - - -/****************************************************************************** - * - * GIF Specific routines - * - *****************************************************************************/ - -static void -writeGifHeader(FILE * const fp, - int const Width, int const Height, - int const GInterlace, int const Background, - int const BitsPerPixel, struct cmap * const cmapP, - const char comment[]) { - - int B; - int const Resolution = BitsPerPixel; - int const ColorMapSize = 1 << BitsPerPixel; - - /* Write the Magic header */ - if (cmapP->transparent != -1 || comment) - fwrite("GIF89a", 1, 6, fp); - else - fwrite("GIF87a", 1, 6, fp); - - /* Write out the screen width and height */ - Putword( Width, fp ); - Putword( Height, fp ); - - /* Indicate that there is a global color map */ - B = 0x80; /* Yes, there is a color map */ - - /* OR in the resolution */ - B |= (Resolution - 1) << 4; - - /* OR in the Bits per Pixel */ - B |= (BitsPerPixel - 1); - - /* Write it out */ - fputc( B, fp ); - - /* Write out the Background color */ - fputc( Background, fp ); - - /* Byte of 0's (future expansion) */ - fputc( 0, fp ); - - { - /* Write out the Global Color Map */ - /* Note that the Global Color Map is always a power of two colors - in size, but *cmapP could be smaller than that. So we pad with - black. - */ - int i; - for ( i=0; i < ColorMapSize; ++i ) { - if ( i < cmapP->cmapsize ) { - fputc( cmapP->red[i], fp ); - fputc( cmapP->green[i], fp ); - fputc( cmapP->blue[i], fp ); - } else { - fputc( 0, fp ); - fputc( 0, fp ); - fputc( 0, fp ); - } +copyRasterWithAlpha(struct pam * const inPamP, + struct pam * const alphaPamP, + struct pam * const outPamP, + unsigned int const alphaPlane) { + + tuple * tuplerow; + tuple * alpharow; + unsigned int row; + + inPamP->allocation_depth = outPamP->depth; + + tuplerow = pnm_allocpamrow(inPamP); + alpharow = pnm_allocpamrow(alphaPamP); + + for (row = 0; row < inPamP->height; ++row) { + unsigned int col; + + pnm_readpamrow(inPamP, tuplerow); + pnm_readpamrow(alphaPamP, alpharow); + + for (col = 0; col < inPamP->width; ++col) { + tuplerow[col][alphaPlane] = pnm_scalesample(alpharow[col][0], + alphaPamP->maxval, + inPamP->maxval); } + pnm_writepamrow(outPamP, tuplerow); } - - if ( cmapP->transparent >= 0 ) - write_transparent_color_index_extension(fp, cmapP->transparent); - - if ( comment ) - write_comment_extension(fp, comment); -} - - - -static void -writeImageHeader(FILE * const ofP, - unsigned int const leftOffset, - unsigned int const topOffset, - unsigned int const gWidth, - unsigned int const gHeight, - unsigned int const gInterlace, - unsigned int const initCodeSize) { - - Putword(leftOffset, ofP); - Putword(topOffset, ofP); - Putword(gWidth, ofP); - Putword(gHeight, ofP); - - /* Write out whether or not the image is interlaced */ - if (gInterlace) - fputc(0x40, ofP); - else - fputc(0x00, ofP); - - /* Write out the initial code size */ - fputc(initCodeSize, ofP); -} - - - -static void -gifEncode(FILE * const ofP, - pixel ** const pixels, - pixval const inputMaxval, - int const gWidth, - int const gHeight, - gray ** const alpha, - gray const alphaMaxval, - int const gInterlace, - int const background, - int const bitsPerPixel, - struct cmap * const cmapP, - char const comment[], - bool const nolzw) { - - unsigned int const leftOffset = 0; - unsigned int const topOffset = 0; - - unsigned int const initCodeSize = bitsPerPixel <= 1 ? 2 : bitsPerPixel; - /* The initial code size */ - - if (gWidth > 65535) - pm_error("Image width %u too large for GIF format. (Max 65535)", - gWidth); - - if (gHeight > 65535) - pm_error("Image height %u too large for GIF format. (Max 65535)", - gHeight); - - writeGifHeader(ofP, gWidth, gHeight, gInterlace, background, - bitsPerPixel, cmapP, comment); - - /* Write an Image separator */ - fputc(',', ofP); - - writeImageHeader(ofP, leftOffset, topOffset, gWidth, gHeight, gInterlace, - initCodeSize); - - initPixelCursor(gWidth, gHeight, gInterlace); - - /* Write the actual raster */ - if (nolzw) - writeRasterUncompressed(ofP, pixels, - inputMaxval, alpha, alphaMaxval, cmapP, - initCodeSize + 1); - else - write_raster_LZW(pixels, - inputMaxval, alpha, alphaMaxval, cmapP, - initCodeSize + 1, ofP); - - /* Write out a zero length data block (to end the series) */ - fputc(0, ofP); - - /* Write the GIF file terminator */ - fputc(';', ofP); -} - - - -static int -compute_transparent(const char colorarg[], - struct cmap * const cmapP) { -/*---------------------------------------------------------------------------- - Figure out the color index (index into the colormap) of the color - that is to be transparent in the GIF. - - colorarg[] is the string that specifies the color the user wants to - be transparent (e.g. "red", "#fefefe"). Its maxval is the maxval - of the colormap. 'cmap' is the full colormap except that its - 'transparent' component isn't valid. - - colorarg[] is a standard Netpbm color specification, except that - may have a "=" prefix, which means it specifies a particular exact - color, as opposed to without the "=", which means "the color that - is closest to this and actually in the image." - - Return -1 if colorarg[] specifies an exact color and that color is not - in the image. Also issue an informational message. ------------------------------------------------------------------------------*/ - int retval; - - const char *colorspec; - bool exact; - int presort_colorindex; - pixel transcolor; - - if (colorarg[0] == '=') { - colorspec = &colorarg[1]; - exact = TRUE; - } else { - colorspec = colorarg; - exact = FALSE; - } - - transcolor = ppm_parsecolor((char*)colorspec, cmapP->maxval); - presort_colorindex = ppm_lookupcolor(cmapP->cht, &transcolor); - - if (presort_colorindex != -1) - retval = cmapP->perm[presort_colorindex]; - else if (!exact) - retval = cmapP->perm[closestcolor(transcolor, cmapP->maxval, cmapP)]; - else { - retval = -1; - pm_message( - "Warning: specified transparent color does not occur in image."); - } - return retval; + pnm_freepamrow(alpharow); + pnm_freepamrow(tuplerow); } static void -sort_colormap(int const sort, struct cmap * const cmapP) { -/*---------------------------------------------------------------------------- - Sort (in place) the colormap *cmapP. - - Create the perm[] and permi[] mappings for the colormap. - - 'sort' is logical: true means to sort the colormap by red intensity, - then by green intensity, then by blue intensity. False means a null - sort -- leave it in the same order in which we found it. ------------------------------------------------------------------------------*/ - int * const Red = cmapP->red; - int * const Blue = cmapP->blue; - int * const Green = cmapP->green; - int * const perm = cmapP->perm; - int * const permi = cmapP->permi; - unsigned int const cmapsize = cmapP->cmapsize; - - int i; - - for (i=0; i < cmapsize; i++) - permi[i] = i; - - if (sort) { - pm_message("sorting colormap"); - for (i=0; i < cmapsize; i++) { - int j; - for (j=i+1; j < cmapsize; j++) - if (((Red[i]*MAXCMAPSIZE)+Green[i])*MAXCMAPSIZE+Blue[i] > - ((Red[j]*MAXCMAPSIZE)+Green[j])*MAXCMAPSIZE+Blue[j]) { - int tmp; - - tmp=permi[i]; permi[i]=permi[j]; permi[j]=tmp; - tmp=Red[i]; Red[i]=Red[j]; Red[j]=tmp; - tmp=Green[i]; Green[i]=Green[j]; Green[j]=tmp; - tmp=Blue[i]; Blue[i]=Blue[j]; Blue[j]=tmp; } } +feedPamtogifWithAlpha(struct pam * const inPamP, + struct pam * const alphaPamP, + FILE * const pipeToPamtogif) { + + unsigned int alphaPlane; + struct pam outPam; + + if (inPamP->width != alphaPamP->width || + inPamP->height != alphaPamP->height) + pm_error("-alpha image dimensions (%u w x %u h) do not match " + "the input image dimensions (%u x %u)", + alphaPamP->width, alphaPamP->height, + inPamP->width, inPamP->height); + + outPam = *inPamP; + outPam.file = pipeToPamtogif; + outPam.format = PAM_FORMAT; + outPam.plainformat = 0; + + if (inPamP->depth == 1) { + alphaPlane = 1; + strcpy(outPam.tuple_type, "GRAYSCALE_ALPHA"); + } else if (inPamP->depth == 3) { + alphaPlane = 3; + strcpy(outPam.tuple_type, "RGB_ALPHA"); } + outPam.depth = alphaPlane + 1; - for (i=0; i < cmapsize; i++) - perm[permi[i]] = i; -} + pnm_writepaminit(&outPam); - - -static void -normalize_to_255(colorhist_vector const chv, struct cmap * const cmapP) { -/*---------------------------------------------------------------------------- - With a PPM color histogram vector 'chv' as input, produce a colormap - of integers 0-255 as output in *cmapP. ------------------------------------------------------------------------------*/ - int i; - pixval const maxval = cmapP->maxval; - - if ( maxval != 255 ) - pm_message( - "maxval is not 255 - automatically rescaling colors" ); - - for ( i = 0; i < cmapP->cmapsize; ++i ) { - if ( maxval == 255 ) { - cmapP->red[i] = (int) PPM_GETR( chv[i].color ); - cmapP->green[i] = (int) PPM_GETG( chv[i].color ); - cmapP->blue[i] = (int) PPM_GETB( chv[i].color ); - } else { - cmapP->red[i] = (int) PPM_GETR( chv[i].color ) * 255 / maxval; - cmapP->green[i] = (int) PPM_GETG( chv[i].color ) * 255 / maxval; - cmapP->blue[i] = (int) PPM_GETB( chv[i].color ) * 255 / maxval; - } - } -} - - - -static void add_to_colormap(struct cmap * const cmapP, - const char * const colorspec, - int * const new_indexP) { -/*---------------------------------------------------------------------------- - Add a new entry to the colormap. Make the color that specified by - 'colorspec', and return the index of the new entry as *new_indexP. - - 'colorspec' is a color specification given by the user, e.g. - "red" or "rgb:ff/03.0d". The maxval for this color specification is - that for the colormap *cmapP. ------------------------------------------------------------------------------*/ - pixel const transcolor = ppm_parsecolor((char*)colorspec, cmapP->maxval); - - *new_indexP = cmapP->cmapsize++; - - cmapP->red[*new_indexP] = PPM_GETR(transcolor); - cmapP->green[*new_indexP] = PPM_GETG(transcolor); - cmapP->blue[*new_indexP] = PPM_GETB(transcolor); + copyRasterWithAlpha(inPamP, alphaPamP, &outPam, alphaPlane); } static void -colormap_from_file(const char filespec[], unsigned int const maxcolors, - colorhist_vector * const chvP, pixval * const maxvalP, - int * const colorsP) { -/*---------------------------------------------------------------------------- - Read a colormap from the PPM file filespec[]. Return the color histogram - vector (which is practically a colormap) of the input image as *cvhP - and the maxval for that histogram as *maxvalP. ------------------------------------------------------------------------------*/ - FILE *mapfile; - int cols, rows; - pixel ** colormap_ppm; - - mapfile = pm_openr(filespec); - colormap_ppm = ppm_readppm(mapfile, &cols, &rows, maxvalP); - pm_close(mapfile); +feedPamtogif(struct pam * const inPamP, + const char * const alphaFilespec, + FILE * const pipeToPamtogif) { - /* Figure out the colormap from the <mapfile>. */ - pm_message("computing other colormap..."); - *chvP = - ppm_computecolorhist(colormap_ppm, cols, rows, maxcolors, colorsP); - - ppm_freearray(colormap_ppm, rows); -} - - - -static void -get_alpha(const char * const alpha_filespec, int const cols, int const rows, - gray *** const alphaP, gray * const maxvalP) { - - if (alpha_filespec) { - int alpha_cols, alpha_rows; - *alphaP = pgm_readpgm(pm_openr(alpha_filespec), - &alpha_cols, &alpha_rows, maxvalP); - if (alpha_cols != cols || alpha_rows != rows) - pm_error("alpha mask is not the same dimensions as the " - "input file (alpha is %dW x %dH; image is %dW x %dH)", - alpha_cols, alpha_rows, cols, rows); - } else - *alphaP = NULL; -} - - - -static void -compute_ppm_colormap(pixel ** const pixels, int const cols, int const rows, - int const input_maxval, bool const have_alpha, - const char * const mapfile, colorhist_vector * const chvP, - colorhash_table * const chtP, - pixval * const colormap_maxvalP, - int * const colorsP) { -/*---------------------------------------------------------------------------- - Compute a colormap, PPM style, for the image 'pixels', which is - 'cols' by 'rows' with maxval 'input_maxval'. If 'mapfile' is - non-null, Use the colors in that (PPM) file for the color map - instead of the colors in 'pixels'. - - Return the colormap as *chvP and *chtP. Return the maxval for that - colormap as *colormap_maxvalP. - - While we're at it, count the colors and validate that there aren't - too many. Return the count as *colorsP. In determining if there are - too many, allow one slot for a fake transparency color if 'have_alpha' - is true. If there are too many, issue an error message and abort the - program. ------------------------------------------------------------------------------*/ - unsigned int maxcolors; - /* The most colors we can tolerate in the image. If we have - our own made-up entry in the colormap for transparency, it - isn't included in this count. - */ - - if (have_alpha) - maxcolors = MAXCMAPSIZE - 1; - else - maxcolors = MAXCMAPSIZE; - - if (mapfile) { - /* Read the colormap from a separate colormap file. */ - colormap_from_file(mapfile, maxcolors, chvP, colormap_maxvalP, - colorsP); - } else { - /* Figure out the color map from the input file */ - pm_message("computing colormap..."); - *chvP = ppm_computecolorhist(pixels, cols, rows, maxcolors, colorsP); - *colormap_maxvalP = input_maxval; - } - - if (*chvP == NULL) - pm_error("too many colors - try doing a 'pnmquant %d'", maxcolors); - pm_message("%d colors found", *colorsP); - - /* And make a hash table for fast lookup. */ - *chtP = ppm_colorhisttocolorhash(*chvP, *colorsP); + if (alphaFilespec) { + FILE * afP; + struct pam alphaPam; + afP = pm_openr(alphaFilespec); + pnm_readpaminit(afP, &alphaPam, PAM_STRUCT_SIZE(tuple_type)); + feedPamtogifWithAlpha(inPamP, &alphaPam, pipeToPamtogif); + pm_close(afP); + } else + feedPamtogifNoAlpha(inPamP, pipeToPamtogif); } int -main(int argc, char *argv[]) { +main(int argc, + char * argv[]) { + struct cmdlineInfo cmdline; FILE * ifP; - int rows, cols; - int BitsPerPixel; - pixel ** pixels; /* The input image, in PPM format */ - pixval input_maxval; /* Maxval for 'pixels' */ - gray ** alpha; /* The supplied alpha mask; NULL if none */ - gray alpha_maxval; /* Maxval for 'alpha' */ - - struct cmap cmap; - /* The colormap, with all its accessories */ - colorhist_vector chv; - int fake_transparent; - /* colormap index of the fake transparency color we're using to - implement the alpha mask. Undefined if we're not doing an alpha - mask. - */ + struct pam inPam; + const char * command; + FILE * pipeToPamtogif; + int rc; - ppm_init( &argc, argv ); + pnm_init(&argc, argv); parseCommandLine(argc, argv, &cmdline); - verbose = cmdline.verbose; - - ifP = pm_openr(cmdline.input_filespec); - - pixels = ppm_readppm(ifP, &cols, &rows, &input_maxval); - - pm_close(ifP); + if (cmdline.mapfile) + openPnmremapStream(cmdline.inputFileName, cmdline.mapfile, + cmdline.verbose, &ifP); + else + ifP = pm_openr(cmdline.inputFileName); + + command = pamtogifCommand(argv[0], cmdline); - get_alpha(cmdline.alpha_filespec, cols, rows, &alpha, &alpha_maxval); + if (cmdline.verbose) + pm_message("Executing shell command '%s'", command); + + pipeToPamtogif = popen(command, "w"); - compute_ppm_colormap(pixels, cols, rows, input_maxval, (alpha != NULL), - cmdline.mapfile, - &chv, &cmap.cht, &cmap.maxval, &cmap.cmapsize); + if (pipeToPamtogif == NULL) + pm_error("Shell command '%s', via popen(), failed.", command); - /* Now turn the ppm colormap into the appropriate GIF colormap. */ + pnm_readpaminit(ifP, &inPam, PAM_STRUCT_SIZE(allocation_depth)); - normalize_to_255(chv, &cmap); + feedPamtogif(&inPam, cmdline.alpha_filespec, pipeToPamtogif); - ppm_freecolorhist(chv); + rc = pclose(pipeToPamtogif); - if (alpha) { - /* Add a fake entry to the end of the colormap for transparency. - Make its color black. - */ - add_to_colormap(&cmap, cmdline.alphacolor, &fake_transparent); - } - sort_colormap(cmdline.sort, &cmap); - - BitsPerPixel = pm_maxvaltobits(cmap.cmapsize-1); - - if (alpha) { - cmap.transparent = cmap.perm[fake_transparent]; - } else { - if (cmdline.transparent) - cmap.transparent = - compute_transparent(cmdline.transparent, &cmap); - else - cmap.transparent = -1; - } - /* All set, let's do it. */ - gifEncode(stdout, pixels, input_maxval, cols, rows, - alpha, alpha_maxval, - cmdline.interlace, 0, BitsPerPixel, &cmap, cmdline.comment, - cmdline.nolzw); + if (rc != 0) + pm_error("Pamtogif process failed. pclose() failed."); - ppm_freearray(pixels, rows); - if (alpha) - pgm_freearray(alpha, rows); + strfree(command); - fclose(stdout); + pm_close(ifP); + pm_close(stdout); return 0; } |