[37] | 1 | /* |
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| 2 | Copyright (C) 2006 Pedro Felzenszwalb |
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| 3 | |
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| 4 | This program is free software; you can redistribute it and/or modify |
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| 5 | it under the terms of the GNU General Public License as published by |
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| 6 | the Free Software Foundation; either version 2 of the License, or |
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| 7 | (at your option) any later version. |
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| 8 | |
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| 9 | This program is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 12 | GNU General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU General Public License |
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| 15 | along with this program; if not, write to the Free Software |
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| 16 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 17 | */ |
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| 18 | |
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| 19 | /* basic image I/O */ |
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| 20 | |
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| 21 | #ifndef PNM_FILE_H |
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| 22 | #define PNM_FILE_H |
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| 23 | |
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| 24 | #include <cstdlib> |
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| 25 | #include <climits> |
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| 26 | #include <cstring> |
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| 27 | #include <fstream> |
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| 28 | #include "image.h" |
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| 29 | #include "misc.h" |
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| 30 | |
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| 31 | #define BUF_SIZE 256 |
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| 32 | |
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| 33 | class pnm_error { }; |
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| 34 | |
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| 35 | static void read_packed(unsigned char *data, int size, std::ifstream &f) { |
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| 36 | unsigned char c = 0; |
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| 37 | |
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| 38 | int bitshift = -1; |
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| 39 | for (int pos = 0; pos < size; pos++) { |
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| 40 | if (bitshift == -1) { |
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| 41 | c = f.get(); |
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| 42 | bitshift = 7; |
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| 43 | } |
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| 44 | data[pos] = (c >> bitshift) & 1; |
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| 45 | bitshift--; |
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| 46 | } |
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| 47 | } |
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| 48 | |
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| 49 | static void write_packed(unsigned char *data, int size, std::ofstream &f) { |
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| 50 | unsigned char c = 0; |
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| 51 | |
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| 52 | int bitshift = 7; |
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| 53 | for (int pos = 0; pos < size; pos++) { |
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| 54 | c = c | (data[pos] << bitshift); |
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| 55 | bitshift--; |
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| 56 | if ((bitshift == -1) || (pos == size-1)) { |
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| 57 | f.put(c); |
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| 58 | bitshift = 7; |
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| 59 | c = 0; |
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| 60 | } |
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| 61 | } |
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| 62 | } |
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| 63 | |
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| 64 | /* read PNM field, skipping comments */ |
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| 65 | static void pnm_read(std::ifstream &file, char *buf) { |
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| 66 | char doc[BUF_SIZE]; |
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| 67 | char c; |
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| 68 | |
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| 69 | file >> c; |
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| 70 | while (c == '#') { |
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| 71 | file.getline(doc, BUF_SIZE); |
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| 72 | file >> c; |
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| 73 | } |
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| 74 | file.putback(c); |
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| 75 | |
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| 76 | file.width(BUF_SIZE); |
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| 77 | file >> buf; |
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| 78 | file.ignore(); |
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| 79 | } |
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| 80 | |
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| 81 | static image<uchar> *loadPBM(const char *name) { |
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| 82 | char buf[BUF_SIZE]; |
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| 83 | |
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| 84 | /* read header */ |
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| 85 | std::ifstream file(name, std::ios::in | std::ios::binary); |
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| 86 | pnm_read(file, buf); |
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| 87 | if (strncmp(buf, "P4", 2)) |
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| 88 | throw pnm_error(); |
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| 89 | |
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| 90 | pnm_read(file, buf); |
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| 91 | int width = atoi(buf); |
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| 92 | pnm_read(file, buf); |
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| 93 | int height = atoi(buf); |
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| 94 | |
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| 95 | /* read data */ |
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| 96 | image<uchar> *im = new image<uchar>(width, height); |
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| 97 | for (int i = 0; i < height; i++) |
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| 98 | read_packed(imPtr(im, 0, i), width, file); |
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| 99 | |
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| 100 | return im; |
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| 101 | } |
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| 102 | |
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| 103 | static void savePBM(image<uchar> *im, const char *name) { |
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| 104 | int width = im->width(); |
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| 105 | int height = im->height(); |
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| 106 | std::ofstream file(name, std::ios::out | std::ios::binary); |
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| 107 | |
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| 108 | file << "P4\n" << width << " " << height << "\n"; |
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| 109 | for (int i = 0; i < height; i++) |
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| 110 | write_packed(imPtr(im, 0, i), width, file); |
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| 111 | } |
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| 112 | |
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| 113 | static image<uchar> *loadPGM(const char *name) { |
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| 114 | char buf[BUF_SIZE]; |
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| 115 | |
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| 116 | /* read header */ |
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| 117 | std::ifstream file(name, std::ios::in | std::ios::binary); |
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| 118 | pnm_read(file, buf); |
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| 119 | if (strncmp(buf, "P5", 2)) |
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| 120 | throw pnm_error(); |
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| 121 | |
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| 122 | pnm_read(file, buf); |
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| 123 | int width = atoi(buf); |
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| 124 | pnm_read(file, buf); |
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| 125 | int height = atoi(buf); |
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| 126 | |
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| 127 | pnm_read(file, buf); |
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| 128 | if (atoi(buf) > UCHAR_MAX) |
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| 129 | throw pnm_error(); |
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| 130 | |
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| 131 | /* read data */ |
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| 132 | image<uchar> *im = new image<uchar>(width, height); |
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| 133 | file.read((char *)imPtr(im, 0, 0), width * height * sizeof(uchar)); |
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| 134 | |
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| 135 | return im; |
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| 136 | } |
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| 137 | |
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| 138 | static void savePGM(image<uchar> *im, const char *name) { |
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| 139 | int width = im->width(); |
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| 140 | int height = im->height(); |
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| 141 | std::ofstream file(name, std::ios::out | std::ios::binary); |
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| 142 | |
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| 143 | file << "P5\n" << width << " " << height << "\n" << UCHAR_MAX << "\n"; |
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| 144 | file.write((char *)imPtr(im, 0, 0), width * height * sizeof(uchar)); |
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| 145 | } |
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| 146 | |
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| 147 | static image<rgb> *loadPPM(const char *name) { |
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| 148 | char buf[BUF_SIZE], doc[BUF_SIZE]; |
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| 149 | |
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| 150 | /* read header */ |
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| 151 | std::ifstream file(name, std::ios::in | std::ios::binary); |
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| 152 | pnm_read(file, buf); |
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| 153 | if (strncmp(buf, "P6", 2)) |
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| 154 | throw pnm_error(); |
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| 155 | |
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| 156 | pnm_read(file, buf); |
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| 157 | int width = atoi(buf); |
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| 158 | pnm_read(file, buf); |
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| 159 | int height = atoi(buf); |
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| 160 | |
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| 161 | pnm_read(file, buf); |
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| 162 | if (atoi(buf) > UCHAR_MAX) |
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| 163 | throw pnm_error(); |
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| 164 | |
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| 165 | /* read data */ |
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| 166 | image<rgb> *im = new image<rgb>(width, height); |
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| 167 | file.read((char *)imPtr(im, 0, 0), width * height * sizeof(rgb)); |
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| 168 | |
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| 169 | return im; |
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| 170 | } |
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| 171 | |
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| 172 | static void savePPM(image<rgb> *im, const char *name) { |
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| 173 | int width = im->width(); |
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| 174 | int height = im->height(); |
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| 175 | std::ofstream file(name, std::ios::out | std::ios::binary); |
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| 176 | |
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| 177 | file << "P6\n" << width << " " << height << "\n" << UCHAR_MAX << "\n"; |
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| 178 | file.write((char *)imPtr(im, 0, 0), width * height * sizeof(rgb)); |
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| 179 | } |
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| 180 | |
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| 181 | template <class T> |
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| 182 | void load_image(image<T> **im, const char *name) { |
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| 183 | char buf[BUF_SIZE]; |
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| 184 | |
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| 185 | /* read header */ |
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| 186 | std::ifstream file(name, std::ios::in | std::ios::binary); |
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| 187 | pnm_read(file, buf); |
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| 188 | if (strncmp(buf, "VLIB", 9)) |
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| 189 | throw pnm_error(); |
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| 190 | |
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| 191 | pnm_read(file, buf); |
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| 192 | int width = atoi(buf); |
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| 193 | pnm_read(file, buf); |
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| 194 | int height = atoi(buf); |
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| 195 | |
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| 196 | /* read data */ |
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| 197 | *im = new image<T>(width, height); |
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| 198 | file.read((char *)imPtr((*im), 0, 0), width * height * sizeof(T)); |
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| 199 | } |
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| 200 | |
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| 201 | template <class T> |
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| 202 | void save_image(image<T> *im, const char *name) { |
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| 203 | int width = im->width(); |
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| 204 | int height = im->height(); |
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| 205 | std::ofstream file(name, std::ios::out | std::ios::binary); |
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| 206 | |
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| 207 | file << "VLIB\n" << width << " " << height << "\n"; |
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| 208 | file.write((char *)imPtr(im, 0, 0), width * height * sizeof(T)); |
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| 209 | } |
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| 210 | |
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| 211 | #endif |
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