png2pnm.c revision 893912bfc2683463dc3e2c445336752d012563d3
1893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* 2893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * png2pnm.c --- conversion from PNG-file to PGM/PPM-file 3893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * copyright (C) 1999 by Willem van Schaik <willem@schaik.com> 4893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * 5893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * version 1.0 - 1999.10.15 - First version. 6893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * 7893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * Permission to use, copy, modify, and distribute this software and 8893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * its documentation for any purpose and without fee is hereby granted, 9893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * provided that the above copyright notice appear in all copies and 10893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * that both that copyright notice and this permission notice appear in 11893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * supporting documentation. This software is provided "as is" without 12893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * express or implied warranty. 13893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project */ 14893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 15893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#include <stdio.h> 16893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#include <stdlib.h> 17893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef __TURBOC__ 18893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#include <mem.h> 19893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#include <fcntl.h> 20893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 21893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 22893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifndef BOOL 23893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#define BOOL unsigned char 24893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 25893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifndef TRUE 26893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#define TRUE (BOOL) 1 27893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 28893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifndef FALSE 29893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#define FALSE (BOOL) 0 30893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 31893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 32893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef __TURBOC__ 33893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#define STDIN 0 34893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#define STDOUT 1 35893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#define STDERR 2 36893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 37893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 38893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* to make png2pnm verbose so we can find problems (needs to be before png.h) */ 39893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifndef PNG_DEBUG 40893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#define PNG_DEBUG 0 41893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 42893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 43893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#include "png.h" 44893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 45893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */ 46893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifndef png_jmpbuf 47893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf) 48893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 49893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 50893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* function prototypes */ 51893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 52893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectint main (int argc, char *argv[]); 53893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid usage (); 54893912bfc2683463dc3e2c445336752d012563d3The Android Open Source ProjectBOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL alpha); 55893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 56893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* 57893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * main 58893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project */ 59893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 60893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectint main(int argc, char *argv[]) 61893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 62893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project FILE *fp_rd = stdin; 63893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project FILE *fp_wr = stdout; 64893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project FILE *fp_al = NULL; 65893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project BOOL raw = TRUE; 66893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project BOOL alpha = FALSE; 67893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int argi; 68893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 69893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (argi = 1; argi < argc; argi++) 70893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 71893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (argv[argi][0] == '-') 72893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 73893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project switch (argv[argi][1]) 74893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 75893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project case 'n': 76893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project raw = FALSE; 77893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 78893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project case 'r': 79893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project raw = TRUE; 80893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 81893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project case 'a': 82893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project alpha = TRUE; 83893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project argi++; 84893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if ((fp_al = fopen (argv[argi], "wb")) == NULL) 85893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 86893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "PNM2PNG\n"); 87893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "Error: can not create alpha-channel file %s\n", argv[argi]); 88893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project exit (1); 89893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 90893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 91893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project case 'h': 92893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project case '?': 93893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project usage(); 94893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project exit(0); 95893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 96893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project default: 97893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "PNG2PNM\n"); 98893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "Error: unknown option %s\n", argv[argi]); 99893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project usage(); 100893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project exit(1); 101893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project break; 102893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } /* end switch */ 103893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 104893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (fp_rd == stdin) 105893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 106893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if ((fp_rd = fopen (argv[argi], "rb")) == NULL) 107893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 108893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "PNG2PNM\n"); 109893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "Error: file %s does not exist\n", argv[argi]); 110893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project exit (1); 111893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 112893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 113893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (fp_wr == stdout) 114893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 115893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if ((fp_wr = fopen (argv[argi], "wb")) == NULL) 116893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 117893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "PNG2PNM\n"); 118893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "Error: can not create file %s\n", argv[argi]); 119893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project exit (1); 120893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 121893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 122893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 123893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 124893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "PNG2PNM\n"); 125893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "Error: too many parameters\n"); 126893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project usage(); 127893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project exit(1); 128893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 129893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } /* end for */ 130893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 131893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef __TURBOC__ 132893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* set stdin/stdout if required to binary */ 133893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (fp_rd == stdin) 134893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 135893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project setmode (STDIN, O_BINARY); 136893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 137893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if ((raw) && (fp_wr == stdout)) 138893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 139893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project setmode (STDOUT, O_BINARY); 140893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 141893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 142893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 143893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* call the conversion program itself */ 144893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png2pnm (fp_rd, fp_wr, fp_al, raw, alpha) == FALSE) 145893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 146893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "PNG2PNM\n"); 147893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "Error: unsuccessful convertion of PNG-image\n"); 148893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project exit(1); 149893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 150893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 151893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* close input file */ 152893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fclose (fp_rd); 153893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* close output file */ 154893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fclose (fp_wr); 155893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* close alpha file */ 156893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (alpha) 157893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fclose (fp_al); 158893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 159893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return 0; 160893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 161893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 162893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* 163893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * usage 164893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project */ 165893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 166893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Projectvoid usage() 167893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 168893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "PNG2PNM\n"); 169893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, " by Willem van Schaik, 1999\n"); 170893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef __TURBOC__ 171893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, " for Turbo-C and Borland-C compilers\n"); 172893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#else 173893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, " for Linux (and Unix) compilers\n"); 174893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 175893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "Usage: png2pnm [options] <file>.png [<file>.pnm]\n"); 176893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, " or: ... | png2pnm [options]\n"); 177893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "Options:\n"); 178893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, " -r[aw] write pnm-file in binary format (P4/P5/P6) (default)\n"); 179893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, " -n[oraw] write pnm-file in ascii format (P1/P2/P3)\n"); 180893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, " -a[lpha] <file>.pgm write PNG alpha channel as pgm-file\n"); 181893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, " -h | -? print this help-information\n"); 182893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} 183893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 184893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project/* 185893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * png2pnm 186893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project */ 187893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 188893912bfc2683463dc3e2c445336752d012563d3The Android Open Source ProjectBOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL alpha) 189893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project{ 190893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_struct *png_ptr = NULL; 191893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_info *info_ptr = NULL; 192893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte buf[8]; 193893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte *png_pixels = NULL; 194893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte **row_pointers = NULL; 195893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_byte *pix_ptr = NULL; 196893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_32 row_bytes; 197893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 198893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_32 width; 199893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_uint_32 height; 200893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int bit_depth; 201893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int channels; 202893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int color_type; 203893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int alpha_present; 204893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int row, col; 205893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int ret; 206893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project int i; 207893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project long dep_16; 208893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 209893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* read and check signature in PNG file */ 210893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project ret = fread (buf, 1, 8, png_file); 211893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (ret != 8) 212893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return FALSE; 213893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 214893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project ret = png_check_sig (buf, 8); 215893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!ret) 216893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return FALSE; 217893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 218893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* create png and info structures */ 219893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 220893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, 221893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project NULL, NULL, NULL); 222893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!png_ptr) 223893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return FALSE; /* out of memory */ 224893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 225893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project info_ptr = png_create_info_struct (png_ptr); 226893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!info_ptr) 227893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 228893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_destroy_read_struct (&png_ptr, NULL, NULL); 229893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return FALSE; /* out of memory */ 230893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 231893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 232893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (setjmp (png_jmpbuf(png_ptr))) 233893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 234893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_destroy_read_struct (&png_ptr, &info_ptr, NULL); 235893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return FALSE; 236893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 237893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 238893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* set up the input control for C streams */ 239893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_init_io (png_ptr, png_file); 240893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_sig_bytes (png_ptr, 8); /* we already read the 8 signature bytes */ 241893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 242893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* read the file information */ 243893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_read_info (png_ptr, info_ptr); 244893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 245893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* get size and bit-depth of the PNG-image */ 246893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_get_IHDR (png_ptr, info_ptr, 247893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project &width, &height, &bit_depth, &color_type, 248893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project NULL, NULL, NULL); 249893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 250893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* set-up the transformations */ 251893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 252893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* transform paletted images into full-color rgb */ 253893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (color_type == PNG_COLOR_TYPE_PALETTE) 254893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_expand (png_ptr); 255893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* expand images to bit-depth 8 (only applicable for grayscale images) */ 256893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) 257893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_expand (png_ptr); 258893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* transform transparency maps into full alpha-channel */ 259893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_get_valid (png_ptr, info_ptr, PNG_INFO_tRNS)) 260893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_expand (png_ptr); 261893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 262893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef NJET 263893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* downgrade 16-bit images to 8 bit */ 264893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (bit_depth == 16) 265893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_strip_16 (png_ptr); 266893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* transform grayscale images into full-color */ 267893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (color_type == PNG_COLOR_TYPE_GRAY || 268893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project color_type == PNG_COLOR_TYPE_GRAY_ALPHA) 269893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_gray_to_rgb (png_ptr); 270893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* only if file has a file gamma, we do a correction */ 271893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_get_gAMA (png_ptr, info_ptr, &file_gamma)) 272893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_set_gamma (png_ptr, (double) 2.2, file_gamma); 273893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 274893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 275893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* all transformations have been registered; now update info_ptr data, 276893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project * get rowbytes and channels, and allocate image memory */ 277893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 278893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_read_update_info (png_ptr, info_ptr); 279893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 280893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* get the new color-type and bit-depth (after expansion/stripping) */ 281893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 282893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project NULL, NULL, NULL); 283893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 284893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* check for 16-bit files */ 285893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (bit_depth == 16) 286893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 287893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project raw = FALSE; 288893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#ifdef __TURBOC__ 289893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project pnm_file->flags &= ~((unsigned) _F_BIN); 290893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project#endif 291893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 292893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 293893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* calculate new number of channels and store alpha-presence */ 294893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (color_type == PNG_COLOR_TYPE_GRAY) 295893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project channels = 1; 296893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA) 297893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project channels = 2; 298893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (color_type == PNG_COLOR_TYPE_RGB) 299893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project channels = 3; 300893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) 301893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project channels = 4; 302893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 303893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project channels = 0; /* should never happen */ 304893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project alpha_present = (channels - 1) % 2; 305893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 306893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* check if alpha is expected to be present in file */ 307893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (alpha && !alpha_present) 308893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 309893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "PNG2PNM\n"); 310893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (stderr, "Error: PNG-file doesn't contain alpha channel\n"); 311893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project exit (1); 312893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 313893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 314893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* row_bytes is the width x number of channels x (bit-depth / 8) */ 315893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project row_bytes = png_get_rowbytes (png_ptr, info_ptr); 316893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 317893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if ((png_pixels = (png_byte *) malloc (row_bytes * height * sizeof (png_byte))) == NULL) { 318893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_destroy_read_struct (&png_ptr, &info_ptr, NULL); 319893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return FALSE; 320893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 321893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 322893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if ((row_pointers = (png_byte **) malloc (height * sizeof (png_bytep))) == NULL) 323893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 324893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_destroy_read_struct (&png_ptr, &info_ptr, NULL); 325893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project free (png_pixels); 326893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_pixels = NULL; 327893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return FALSE; 328893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 329893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 330893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* set the individual row_pointers to point at the correct offsets */ 331893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (i = 0; i < (height); i++) 332893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project row_pointers[i] = png_pixels + i * row_bytes; 333893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 334893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* now we can go ahead and just read the whole image */ 335893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_read_image (png_ptr, row_pointers); 336893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 337893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* read rest of file, and get additional chunks in info_ptr - REQUIRED */ 338893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_read_end (png_ptr, info_ptr); 339893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 340893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* clean up after the read, and free any memory allocated - REQUIRED */ 341893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project png_destroy_read_struct (&png_ptr, &info_ptr, (png_infopp) NULL); 342893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 343893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* write header of PNM file */ 344893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 345893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if ((color_type == PNG_COLOR_TYPE_GRAY) || 346893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)) 347893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 348893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (pnm_file, "%s\n", (raw) ? "P5" : "P2"); 349893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (pnm_file, "%d %d\n", (int) width, (int) height); 350893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (pnm_file, "%ld\n", ((1L << (int) bit_depth) - 1L)); 351893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 352893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else if ((color_type == PNG_COLOR_TYPE_RGB) || 353893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project (color_type == PNG_COLOR_TYPE_RGB_ALPHA)) 354893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 355893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (pnm_file, "%s\n", (raw) ? "P6" : "P3"); 356893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (pnm_file, "%d %d\n", (int) width, (int) height); 357893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (pnm_file, "%ld\n", ((1L << (int) bit_depth) - 1L)); 358893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 359893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 360893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* write header of PGM file with alpha channel */ 361893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 362893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if ((alpha) && 363893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project ((color_type == PNG_COLOR_TYPE_GRAY_ALPHA) || 364893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project (color_type == PNG_COLOR_TYPE_RGB_ALPHA))) 365893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 366893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (alpha_file, "%s\n", (raw) ? "P5" : "P2"); 367893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (alpha_file, "%d %d\n", (int) width, (int) height); 368893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (alpha_file, "%ld\n", ((1L << (int) bit_depth) - 1L)); 369893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 370893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 371893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project /* write data to PNM file */ 372893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project pix_ptr = png_pixels; 373893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 374893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (row = 0; row < height; row++) 375893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 376893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (col = 0; col < width; col++) 377893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 378893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project for (i = 0; i < (channels - alpha_present); i++) 379893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 380893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (raw) 381893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fputc ((int) *pix_ptr++ , pnm_file); 382893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 383893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (bit_depth == 16){ 384893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dep_16 = (long) *pix_ptr++; 385893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (pnm_file, "%ld ", (dep_16 << 8) + ((long) *pix_ptr++)); 386893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 387893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 388893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (pnm_file, "%ld ", (long) *pix_ptr++); 389893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 390893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (alpha_present) 391893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 392893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!alpha) 393893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 394893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project pix_ptr++; /* alpha */ 395893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (bit_depth == 16) 396893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project pix_ptr++; 397893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 398893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else /* output alpha-channel as pgm file */ 399893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project { 400893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (raw) 401893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fputc ((int) *pix_ptr++ , alpha_file); 402893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 403893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (bit_depth == 16){ 404893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project dep_16 = (long) *pix_ptr++; 405893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (alpha_file, "%ld ", (dep_16 << 8) + (long) *pix_ptr++); 406893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 407893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project else 408893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (alpha_file, "%ld ", (long) *pix_ptr++); 409893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } 410893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } /* if alpha_present */ 411893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 412893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!raw) 413893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (col % 4 == 3) 414893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (pnm_file, "\n"); 415893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } /* end for col */ 416893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 417893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (!raw) 418893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (col % 4 != 0) 419893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project fprintf (pnm_file, "\n"); 420893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project } /* end for row */ 421893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 422893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (row_pointers != (unsigned char**) NULL) 423893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project free (row_pointers); 424893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project if (png_pixels != (unsigned char*) NULL) 425893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project free (png_pixels); 426893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 427893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project return TRUE; 428893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 429893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project} /* end of source */ 430893912bfc2683463dc3e2c445336752d012563d3The Android Open Source Project 431