+++ /dev/null
-/*
- * png2pnm.c --- conversion from PNG-file to PGM/PPM-file
- * copyright (C) 1999 by Willem van Schaik <willem@schaik.com>
- *
- * version 1.0 - 1999.10.15 - First version.
- *
- * 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.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#ifdef __TURBOC__
-#include <mem.h>
-#include <fcntl.h>
-#endif
-
-#ifndef BOOL
-#define BOOL unsigned char
-#endif
-#ifndef TRUE
-#define TRUE (BOOL) 1
-#endif
-#ifndef FALSE
-#define FALSE (BOOL) 0
-#endif
-
-#ifdef __TURBOC__
-#define STDIN 0
-#define STDOUT 1
-#define STDERR 2
-#endif
-
-/* to make png2pnm verbose so we can find problems (needs to be before png.h) */
-#ifndef PNG_DEBUG
-#define PNG_DEBUG 0
-#endif
-
-#include "png.h"
-
-/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
-#ifndef png_jmpbuf
-# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
-#endif
-
-/* function prototypes */
-
-int main (int argc, char *argv[]);
-void usage ();
-BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL alpha);
-
-/*
- * main
- */
-
-int main(int argc, char *argv[])
-{
- FILE *fp_rd = stdin;
- FILE *fp_wr = stdout;
- FILE *fp_al = NULL;
- BOOL raw = TRUE;
- BOOL alpha = FALSE;
- int argi;
-
- for (argi = 1; argi < argc; argi++)
- {
- if (argv[argi][0] == '-')
- {
- switch (argv[argi][1])
- {
- case 'n':
- raw = FALSE;
- break;
- case 'r':
- raw = TRUE;
- break;
- case 'a':
- alpha = TRUE;
- argi++;
- if ((fp_al = fopen (argv[argi], "wb")) == NULL)
- {
- fprintf (stderr, "PNM2PNG\n");
- fprintf (stderr, "Error: can not create alpha-channel file %s\n", argv[argi]);
- exit (1);
- }
- break;
- case 'h':
- case '?':
- usage();
- exit(0);
- break;
- default:
- fprintf (stderr, "PNG2PNM\n");
- fprintf (stderr, "Error: unknown option %s\n", argv[argi]);
- usage();
- exit(1);
- break;
- } /* end switch */
- }
- else if (fp_rd == stdin)
- {
- if ((fp_rd = fopen (argv[argi], "rb")) == NULL)
- {
- fprintf (stderr, "PNG2PNM\n");
- fprintf (stderr, "Error: file %s does not exist\n", argv[argi]);
- exit (1);
- }
- }
- else if (fp_wr == stdout)
- {
- if ((fp_wr = fopen (argv[argi], "wb")) == NULL)
- {
- fprintf (stderr, "PNG2PNM\n");
- fprintf (stderr, "Error: can not create file %s\n", argv[argi]);
- exit (1);
- }
- }
- else
- {
- fprintf (stderr, "PNG2PNM\n");
- fprintf (stderr, "Error: too many parameters\n");
- usage();
- exit(1);
- }
- } /* end for */
-
-#ifdef __TURBOC__
- /* set stdin/stdout if required to binary */
- if (fp_rd == stdin)
- {
- setmode (STDIN, O_BINARY);
- }
- if ((raw) && (fp_wr == stdout))
- {
- setmode (STDOUT, O_BINARY);
- }
-#endif
-
- /* call the conversion program itself */
- if (png2pnm (fp_rd, fp_wr, fp_al, raw, alpha) == FALSE)
- {
- fprintf (stderr, "PNG2PNM\n");
- fprintf (stderr, "Error: unsuccessful convertion of PNG-image\n");
- exit(1);
- }
-
- /* close input file */
- fclose (fp_rd);
- /* close output file */
- fclose (fp_wr);
- /* close alpha file */
- if (alpha)
- fclose (fp_al);
-
- return 0;
-}
-
-/*
- * usage
- */
-
-void usage()
-{
- fprintf (stderr, "PNG2PNM\n");
- fprintf (stderr, " by Willem van Schaik, 1999\n");
-#ifdef __TURBOC__
- fprintf (stderr, " for Turbo-C and Borland-C compilers\n");
-#else
- fprintf (stderr, " for Linux (and Unix) compilers\n");
-#endif
- fprintf (stderr, "Usage: png2pnm [options] <file>.png [<file>.pnm]\n");
- fprintf (stderr, " or: ... | png2pnm [options]\n");
- fprintf (stderr, "Options:\n");
- fprintf (stderr, " -r[aw] write pnm-file in binary format (P4/P5/P6) (default)\n");
- fprintf (stderr, " -n[oraw] write pnm-file in ascii format (P1/P2/P3)\n");
- fprintf (stderr, " -a[lpha] <file>.pgm write PNG alpha channel as pgm-file\n");
- fprintf (stderr, " -h | -? print this help-information\n");
-}
-
-/*
- * png2pnm
- */
-
-BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL alpha)
-{
- png_struct *png_ptr = NULL;
- png_info *info_ptr = NULL;
- png_byte buf[8];
- png_byte *png_pixels = NULL;
- png_byte **row_pointers = NULL;
- png_byte *pix_ptr = NULL;
- png_uint_32 row_bytes;
-
- png_uint_32 width;
- png_uint_32 height;
- int bit_depth;
- int channels;
- int color_type;
- int alpha_present;
- int row, col;
- int ret;
- int i;
- long dep_16;
-
- /* read and check signature in PNG file */
- ret = fread (buf, 1, 8, png_file);
- if (ret != 8)
- return FALSE;
-
- ret = png_check_sig (buf, 8);
- if (!ret)
- return FALSE;
-
- /* create png and info structures */
-
- png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING,
- NULL, NULL, NULL);
- if (!png_ptr)
- return FALSE; /* out of memory */
-
- info_ptr = png_create_info_struct (png_ptr);
- if (!info_ptr)
- {
- png_destroy_read_struct (&png_ptr, NULL, NULL);
- return FALSE; /* out of memory */
- }
-
- if (setjmp (png_jmpbuf(png_ptr)))
- {
- png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
- return FALSE;
- }
-
- /* set up the input control for C streams */
- png_init_io (png_ptr, png_file);
- png_set_sig_bytes (png_ptr, 8); /* we already read the 8 signature bytes */
-
- /* read the file information */
- png_read_info (png_ptr, info_ptr);
-
- /* get size and bit-depth of the PNG-image */
- png_get_IHDR (png_ptr, info_ptr,
- &width, &height, &bit_depth, &color_type,
- NULL, NULL, NULL);
-
- /* set-up the transformations */
-
- /* transform paletted images into full-color rgb */
- if (color_type == PNG_COLOR_TYPE_PALETTE)
- png_set_expand (png_ptr);
- /* expand images to bit-depth 8 (only applicable for grayscale images) */
- if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
- png_set_expand (png_ptr);
- /* transform transparency maps into full alpha-channel */
- if (png_get_valid (png_ptr, info_ptr, PNG_INFO_tRNS))
- png_set_expand (png_ptr);
-
-#ifdef NJET
- /* downgrade 16-bit images to 8 bit */
- if (bit_depth == 16)
- png_set_strip_16 (png_ptr);
- /* transform grayscale images into full-color */
- if (color_type == PNG_COLOR_TYPE_GRAY ||
- color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
- png_set_gray_to_rgb (png_ptr);
- /* only if file has a file gamma, we do a correction */
- if (png_get_gAMA (png_ptr, info_ptr, &file_gamma))
- png_set_gamma (png_ptr, (double) 2.2, file_gamma);
-#endif
-
- /* all transformations have been registered; now update info_ptr data,
- * get rowbytes and channels, and allocate image memory */
-
- png_read_update_info (png_ptr, info_ptr);
-
- /* get the new color-type and bit-depth (after expansion/stripping) */
- png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
- NULL, NULL, NULL);
-
- /* check for 16-bit files */
- if (bit_depth == 16)
- {
- raw = FALSE;
-#ifdef __TURBOC__
- pnm_file->flags &= ~((unsigned) _F_BIN);
-#endif
- }
-
- /* calculate new number of channels and store alpha-presence */
- if (color_type == PNG_COLOR_TYPE_GRAY)
- channels = 1;
- else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
- channels = 2;
- else if (color_type == PNG_COLOR_TYPE_RGB)
- channels = 3;
- else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
- channels = 4;
- else
- channels = 0; /* should never happen */
- alpha_present = (channels - 1) % 2;
-
- /* check if alpha is expected to be present in file */
- if (alpha && !alpha_present)
- {
- fprintf (stderr, "PNG2PNM\n");
- fprintf (stderr, "Error: PNG-file doesn't contain alpha channel\n");
- exit (1);
- }
-
- /* row_bytes is the width x number of channels x (bit-depth / 8) */
- row_bytes = png_get_rowbytes (png_ptr, info_ptr);
-
- if ((png_pixels = (png_byte *) malloc (row_bytes * height * sizeof (png_byte))) == NULL) {
- png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
- return FALSE;
- }
-
- if ((row_pointers = (png_byte **) malloc (height * sizeof (png_bytep))) == NULL)
- {
- png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
- free (png_pixels);
- png_pixels = NULL;
- return FALSE;
- }
-
- /* set the individual row_pointers to point at the correct offsets */
- for (i = 0; i < (height); i++)
- row_pointers[i] = png_pixels + i * row_bytes;
-
- /* now we can go ahead and just read the whole image */
- png_read_image (png_ptr, row_pointers);
-
- /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
- png_read_end (png_ptr, info_ptr);
-
- /* clean up after the read, and free any memory allocated - REQUIRED */
- png_destroy_read_struct (&png_ptr, &info_ptr, (png_infopp) NULL);
-
- /* write header of PNM file */
-
- if ((color_type == PNG_COLOR_TYPE_GRAY) ||
- (color_type == PNG_COLOR_TYPE_GRAY_ALPHA))
- {
- fprintf (pnm_file, "%s\n", (raw) ? "P5" : "P2");
- fprintf (pnm_file, "%d %d\n", (int) width, (int) height);
- fprintf (pnm_file, "%ld\n", ((1L << (int) bit_depth) - 1L));
- }
- else if ((color_type == PNG_COLOR_TYPE_RGB) ||
- (color_type == PNG_COLOR_TYPE_RGB_ALPHA))
- {
- fprintf (pnm_file, "%s\n", (raw) ? "P6" : "P3");
- fprintf (pnm_file, "%d %d\n", (int) width, (int) height);
- fprintf (pnm_file, "%ld\n", ((1L << (int) bit_depth) - 1L));
- }
-
- /* write header of PGM file with alpha channel */
-
- if ((alpha) &&
- ((color_type == PNG_COLOR_TYPE_GRAY_ALPHA) ||
- (color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
- {
- fprintf (alpha_file, "%s\n", (raw) ? "P5" : "P2");
- fprintf (alpha_file, "%d %d\n", (int) width, (int) height);
- fprintf (alpha_file, "%ld\n", ((1L << (int) bit_depth) - 1L));
- }
-
- /* write data to PNM file */
- pix_ptr = png_pixels;
-
- for (row = 0; row < height; row++)
- {
- for (col = 0; col < width; col++)
- {
- for (i = 0; i < (channels - alpha_present); i++)
- {
- if (raw)
- fputc ((int) *pix_ptr++ , pnm_file);
- else
- if (bit_depth == 16){
- dep_16 = (long) *pix_ptr++;
- fprintf (pnm_file, "%ld ", (dep_16 << 8) + ((long) *pix_ptr++));
- }
- else
- fprintf (pnm_file, "%ld ", (long) *pix_ptr++);
- }
- if (alpha_present)
- {
- if (!alpha)
- {
- pix_ptr++; /* alpha */
- if (bit_depth == 16)
- pix_ptr++;
- }
- else /* output alpha-channel as pgm file */
- {
- if (raw)
- fputc ((int) *pix_ptr++ , alpha_file);
- else
- if (bit_depth == 16){
- dep_16 = (long) *pix_ptr++;
- fprintf (alpha_file, "%ld ", (dep_16 << 8) + (long) *pix_ptr++);
- }
- else
- fprintf (alpha_file, "%ld ", (long) *pix_ptr++);
- }
- } /* if alpha_present */
-
- if (!raw)
- if (col % 4 == 3)
- fprintf (pnm_file, "\n");
- } /* end for col */
-
- if (!raw)
- if (col % 4 != 0)
- fprintf (pnm_file, "\n");
- } /* end for row */
-
- if (row_pointers != (unsigned char**) NULL)
- free (row_pointers);
- if (png_pixels != (unsigned char*) NULL)
- free (png_pixels);
-
- return TRUE;
-
-} /* end of source */
-
projects / synfig.git / blobdiff