671242f350d172e106580348e24bab66b0d7e6a5vboxsync * pnm2png.c --- conversion from PBM/PGM/PPM-file to PNG-file
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * copyright (C) 1999 by Willem van Schaik <willem@schaik.com>
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * version 1.0 - 1999.10.15 - First version.
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * Permission to use, copy, modify, and distribute this software and
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * its documentation for any purpose and without fee is hereby granted,
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * provided that the above copyright notice appear in all copies and
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * that both that copyright notice and this permission notice appear in
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * supporting documentation. This software is provided "as is" without
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * express or implied warranty.
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/* to make pnm2png verbose so we can find problems (needs to be before png.h) */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/* function prototypes */
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncBOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace, BOOL alpha);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Error: alpha-channel file %s does not exist\n",
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Error: unknown option %s\n", argv[argi]);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync } /* end switch */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Error: file %s does not exist\n", argv[argi]);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Error: can not create PNG-file %s\n", argv[argi]);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync } /* end for */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* set stdin/stdout to binary, we're reading the PNM always! in binary format */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* call the conversion program itself */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (pnm2png (fp_rd, fp_wr, fp_al, interlace, alpha) == FALSE)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Error: unsuccessful converting to PNG-image\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* close input file */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* close output file */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* close alpha file */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, " for Turbo-C and Borland-C compilers\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, " for Linux (and Unix) compilers\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Usage: pnm2png [options] <file>.<pnm> [<file>.png]\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, " or: ... | pnm2png [options]\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, " -i[nterlace] write png-file with interlacing on\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, " -a[lpha] <file>.pgm read PNG alpha channel as pgm-file\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, " -h | -? print this help-information\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncBOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace, BOOL alpha)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* read header of PNM file */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if ((type_token[1] == '1') || (type_token[1] == '4'))
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if ((type_token[1] == '2') || (type_token[1] == '5'))
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else /* if (maxval <= 65535) */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if ((type_token[1] == '3') || (type_token[1] == '6'))
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else /* if (maxval <= 65535) */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* read header of PGM file with alpha channel */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if ((type_token[1] == '2') || (type_token[1] == '5'))
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else /* if (maxval <= 65535) */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync } /* end if alpha */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* calculate the number of channels and store alpha-presence */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* row_bytes is the width x number of channels x (bit-depth / 8) */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if ((png_pixels = (png_byte *) malloc (row_bytes * height * sizeof (png_byte))) == NULL)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* read data from PNM file */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync } /* if alpha */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync } /* end for col */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync } /* end for row */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* prepare the standard PNG structures */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* setjmp() must be called in every function that calls a PNG-reading libpng function */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* initialize the png structure */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* we're going to write more or less the same PNG as the input file */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_set_IHDR (png_ptr, info_ptr, width, height, bit_depth, color_type,
671242f350d172e106580348e24bab66b0d7e6a5vboxsync (!interlace) ? PNG_INTERLACE_NONE : PNG_INTERLACE_ADAM7,
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* write the file header information */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* if needed we will allocate memory for an new array of row-pointers */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if ((row_pointers = (png_byte **) malloc (height * sizeof (png_bytep))) == NULL)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* set the individual row_pointers to point at the correct offsets */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync for (i = 0; i < (height); i++)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* write out the entire image data in one call */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* write the additional chuncks to the PNG file (not really needed) */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* clean up after the write, and free any memory allocated */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync} /* end of pnm2png */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * get_token() - gets the first string after whitespace
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* remove white-space */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync while ((token[i] == '\n') || (token[i] == '\r') || (token[i] == ' '));
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* read string */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync while ((token[i] != '\n') && (token[i] != '\r') && (token[i] != ' '));
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * get_data() - takes first byte and converts into next pixel value,
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * taking as much bits as defined by bit-depth and
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * using the bit-depth to fill up a byte (0Ah -> AAh)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync for (i = 0; i < depth; i++)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * get_value() - takes first (numeric) string and converts into number,
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * using the bit-depth to fill up a byte (0Ah -> AAh)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync for (i = 0; i < depth; i++)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/* end of source */