3dphotoshoot

annotate libs/imago/file_ppm.c @ 14:06dc8b9b4f89

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added libimago, libjpeg and libpng
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 07 Jun 2015 17:25:49 +0300
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nuclear@14 1 /*
nuclear@14 2 libimago - a multi-format image file input/output library.
nuclear@14 3 Copyright (C) 2010 John Tsiombikas <nuclear@member.fsf.org>
nuclear@14 4
nuclear@14 5 This program is free software: you can redistribute it and/or modify
nuclear@14 6 it under the terms of the GNU Lesser General Public License as published
nuclear@14 7 by the Free Software Foundation, either version 3 of the License, or
nuclear@14 8 (at your option) any later version.
nuclear@14 9
nuclear@14 10 This program is distributed in the hope that it will be useful,
nuclear@14 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@14 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@14 13 GNU Lesser General Public License for more details.
nuclear@14 14
nuclear@14 15 You should have received a copy of the GNU Lesser General Public License
nuclear@14 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@14 17 */
nuclear@14 18
nuclear@14 19 /* -- Portable Pixmap (PPM) module -- */
nuclear@14 20
nuclear@14 21 #include <string.h>
nuclear@14 22 #include "imago2.h"
nuclear@14 23 #include "ftype_module.h"
nuclear@14 24
nuclear@14 25 static int check(struct img_io *io);
nuclear@14 26 static int read(struct img_pixmap *img, struct img_io *io);
nuclear@14 27 static int write(struct img_pixmap *img, struct img_io *io);
nuclear@14 28
nuclear@14 29 int img_register_ppm(void)
nuclear@14 30 {
nuclear@14 31 static struct ftype_module mod = {".ppm", check, read, write};
nuclear@14 32 return img_register_module(&mod);
nuclear@14 33 }
nuclear@14 34
nuclear@14 35
nuclear@14 36 static int check(struct img_io *io)
nuclear@14 37 {
nuclear@14 38 char id[2];
nuclear@14 39 int res = -1;
nuclear@14 40 long pos = io->seek(0, SEEK_CUR, io->uptr);
nuclear@14 41
nuclear@14 42 if(io->read(id, 2, io->uptr) < 2) {
nuclear@14 43 io->seek(pos, SEEK_SET, io->uptr);
nuclear@14 44 return -1;
nuclear@14 45 }
nuclear@14 46
nuclear@14 47 if(id[0] == 'P' && (id[1] == '6' || id[1] == '3')) {
nuclear@14 48 res = 0;
nuclear@14 49 }
nuclear@14 50 io->seek(pos, SEEK_SET, io->uptr);
nuclear@14 51 return res;
nuclear@14 52 }
nuclear@14 53
nuclear@14 54 static int iofgetc(struct img_io *io)
nuclear@14 55 {
nuclear@14 56 char c;
nuclear@14 57 return io->read(&c, 1, io->uptr) < 1 ? -1 : c;
nuclear@14 58 }
nuclear@14 59
nuclear@14 60 static char *iofgets(char *buf, int size, struct img_io *io)
nuclear@14 61 {
nuclear@14 62 int c;
nuclear@14 63 char *ptr = buf;
nuclear@14 64
nuclear@14 65 while(--size > 0 && (c = iofgetc(io)) != -1) {
nuclear@14 66 *ptr++ = c;
nuclear@14 67 if(c == '\n') break;
nuclear@14 68 }
nuclear@14 69 *ptr = 0;
nuclear@14 70
nuclear@14 71 return ptr == buf ? 0 : buf;
nuclear@14 72 }
nuclear@14 73
nuclear@14 74 /* TODO: implement P3 reading */
nuclear@14 75 static int read(struct img_pixmap *img, struct img_io *io)
nuclear@14 76 {
nuclear@14 77 char buf[256];
nuclear@14 78 int xsz, ysz, maxval, got_hdrlines = 1;
nuclear@14 79
nuclear@14 80 if(!iofgets(buf, sizeof buf, io)) {
nuclear@14 81 return -1;
nuclear@14 82 }
nuclear@14 83 if(!(buf[0] == 'P' && (buf[1] == '6' || buf[1] == '3'))) {
nuclear@14 84 return -1;
nuclear@14 85 }
nuclear@14 86
nuclear@14 87 while(got_hdrlines < 3 && iofgets(buf, sizeof buf, io)) {
nuclear@14 88 if(buf[0] == '#') continue;
nuclear@14 89
nuclear@14 90 switch(got_hdrlines) {
nuclear@14 91 case 1:
nuclear@14 92 if(sscanf(buf, "%d %d\n", &xsz, &ysz) < 2) {
nuclear@14 93 return -1;
nuclear@14 94 }
nuclear@14 95 break;
nuclear@14 96
nuclear@14 97 case 2:
nuclear@14 98 if(sscanf(buf, "%d\n", &maxval) < 1) {
nuclear@14 99 return -1;
nuclear@14 100 }
nuclear@14 101 default:
nuclear@14 102 break;
nuclear@14 103 }
nuclear@14 104 got_hdrlines++;
nuclear@14 105 }
nuclear@14 106
nuclear@14 107 if(xsz < 1 || ysz < 1 || maxval != 255) {
nuclear@14 108 return -1;
nuclear@14 109 }
nuclear@14 110
nuclear@14 111 if(img_set_pixels(img, xsz, ysz, IMG_FMT_RGB24, 0) == -1) {
nuclear@14 112 return -1;
nuclear@14 113 }
nuclear@14 114
nuclear@14 115 if(io->read(img->pixels, xsz * ysz * 3, io->uptr) < (unsigned int)(xsz * ysz * 3)) {
nuclear@14 116 return -1;
nuclear@14 117 }
nuclear@14 118 return 0;
nuclear@14 119 }
nuclear@14 120
nuclear@14 121 static int write(struct img_pixmap *img, struct img_io *io)
nuclear@14 122 {
nuclear@14 123 int sz;
nuclear@14 124 char buf[256];
nuclear@14 125 struct img_pixmap tmpimg;
nuclear@14 126
nuclear@14 127 img_init(&tmpimg);
nuclear@14 128
nuclear@14 129 if(img->fmt != IMG_FMT_RGB24) {
nuclear@14 130 if(img_copy(&tmpimg, img) == -1) {
nuclear@14 131 return -1;
nuclear@14 132 }
nuclear@14 133 if(img_convert(&tmpimg, IMG_FMT_RGB24) == -1) {
nuclear@14 134 return -1;
nuclear@14 135 }
nuclear@14 136 img = &tmpimg;
nuclear@14 137 }
nuclear@14 138
nuclear@14 139 sprintf(buf, "P6\n#written by libimago2\n%d %d\n255\n", img->width, img->height);
nuclear@14 140 if(io->write(buf, strlen(buf), io->uptr) < strlen(buf)) {
nuclear@14 141 img_destroy(&tmpimg);
nuclear@14 142 return -1;
nuclear@14 143 }
nuclear@14 144
nuclear@14 145 sz = img->width * img->height * 3;
nuclear@14 146 if(io->write(img->pixels, sz, io->uptr) < (unsigned int)sz) {
nuclear@14 147 img_destroy(&tmpimg);
nuclear@14 148 return -1;
nuclear@14 149 }
nuclear@14 150
nuclear@14 151 img_destroy(&tmpimg);
nuclear@14 152 return 0;
nuclear@14 153 }