istereo: 73813c1176de libs/imago2/imago2.c

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view libs/imago2/imago2.c @ 43:73813c1176de

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author	John Tsiombikas <nuclear@member.fsf.org>
date	Fri, 14 Aug 2015 04:33:42 +0300
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1 /*

2 libimago - a multi-format image file input/output library.

5 This program is free software: you can redistribute it and/or modify

6 it under the terms of the GNU Lesser General Public License as published

7 by the Free Software Foundation, either version 3 of the License, or

8 (at your option) any later version.

10 This program is distributed in the hope that it will be useful,

11 but WITHOUT ANY WARRANTY; without even the implied warranty of

12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13 GNU Lesser General Public License for more details.

15 You should have received a copy of the GNU Lesser General Public License

16 along with this program. If not, see <http://www.gnu.org/licenses/>.

17 */

19 #include <stdio.h>

20 #include <stdlib.h>

21 #include <string.h>

22 #include "imago2.h"

23 #include "ftype_module.h"

25 static int pixel_size(enum img_fmt fmt);

26 static size_t def_read(void *buf, size_t bytes, void *uptr);

27 static size_t def_write(void *buf, size_t bytes, void *uptr);

28 static long def_seek(long offset, int whence, void *uptr);

31 void img_init(struct img_pixmap *img)

32 {

33 img->pixels = 0;

34 img->width = img->height = 0;

35 img->fmt = IMG_FMT_RGBA32;

36 img->pixelsz = pixel_size(img->fmt);

37 img->name = 0;

38 }

41 void img_destroy(struct img_pixmap *img)

42 {

43 free(img->pixels);

44 img->pixels = 0; /* just in case... */

45 img->width = img->height = 0xbadbeef;

46 free(img->name);

47 }

49 struct img_pixmap *img_create(void)

50 {

51 struct img_pixmap *p;

53 if(!(p = malloc(sizeof *p))) {

54 return 0;

55 }

56 img_init(p);

57 return p;

58 }

60 void img_free(struct img_pixmap *img)

61 {

62 img_destroy(img);

63 free(img);

64 }

66 int img_set_name(struct img_pixmap *img, const char *name)

67 {

68 char *tmp;

70 if(!(tmp = malloc(strlen(name) + 1))) {

71 return -1;

72 }

73 strcpy(tmp, name);

74 img->name = tmp;

75 return 0;

76 }

78 int img_set_format(struct img_pixmap *img, enum img_fmt fmt)

79 {

80 if(img->pixels) {

81 return img_convert(img, fmt);

82 }

83 img->fmt = fmt;

84 return 0;

85 }

87 int img_copy(struct img_pixmap *dest, struct img_pixmap *src)

88 {

89 return img_set_pixels(dest, src->width, src->height, src->fmt, src->pixels);

90 }

92 int img_set_pixels(struct img_pixmap *img, int w, int h, enum img_fmt fmt, void *pix)

93 {

94 void *newpix;

95 int pixsz = pixel_size(fmt);

97 if(!(newpix = malloc(w * h * pixsz))) {

98 return -1;

99 }

100

101 if(pix) {

102 memcpy(newpix, pix, w * h * pixsz);

103 } else {

104 memset(newpix, 0, w * h * pixsz);

105 }

106

107 free(img->pixels);

108 img->pixels = newpix;

109 img->width = w;

110 img->height = h;

111 img->pixelsz = pixsz;

112 img->fmt = fmt;

113 return 0;

114 }

115

116 void *img_load_pixels(const char *fname, int *xsz, int *ysz, enum img_fmt fmt)

117 {

118 struct img_pixmap img;

119

120 img_init(&img);

121

122 if(img_load(&img, fname) == -1) {

123 return 0;

124 }

125 if(img.fmt != fmt) {

126 if(img_convert(&img, fmt) == -1) {

127 img_destroy(&img);

128 return 0;

129 }

130 }

131

132 *xsz = img.width;

133 *ysz = img.height;

134 return img.pixels;

135 }

136

137 int img_save_pixels(const char *fname, void *pix, int xsz, int ysz, enum img_fmt fmt)

138 {

139 struct img_pixmap img;

140

141 img_init(&img);

142 img.fmt = fmt;

143 img.name = (char*)fname;

144 img.width = xsz;

145 img.height = ysz;

146 img.pixels = pix;

147

148 return img_save(&img, fname);

149 }

150

151 void img_free_pixels(void *pix)

152 {

153 free(pix);

154 }

155

156 int img_load(struct img_pixmap *img, const char *fname)

157 {

158 int res;

159 FILE *fp;

160

161 if(!(fp = fopen(fname, "rb"))) {

162 return -1;

163 }

164 res = img_read_file(img, fp);

165 fclose(fp);

166 return res;

167 }

168

169 /* TODO implement filetype selection */

170 int img_save(struct img_pixmap *img, const char *fname)

171 {

172 int res;

173 FILE *fp;

174

175 img_set_name(img, fname);

176

177 if(!(fp = fopen(fname, "wb"))) {

178 return -1;

179 }

180 res = img_write_file(img, fp);

181 fclose(fp);

182 return res;

183 }

184

185 int img_read_file(struct img_pixmap *img, FILE *fp)

186 {

187 struct img_io io = {0, def_read, def_write, def_seek};

188

189 io.uptr = fp;

190 return img_read(img, &io);

191 }

192

193 int img_write_file(struct img_pixmap *img, FILE *fp)

194 {

195 struct img_io io = {0, def_read, def_write, def_seek};

196

197 io.uptr = fp;

198 return img_write(img, &io);

199 }

200

201 int img_read(struct img_pixmap *img, struct img_io *io)

202 {

203 struct ftype_module *mod;

204

205 if((mod = img_find_format_module(io))) {

206 return mod->read(img, io);

207 }

208 return -1;

209 }

210

211 int img_write(struct img_pixmap *img, struct img_io *io)

212 {

213 struct ftype_module *mod;

214

215 if(!img->name || !(mod = img_guess_format(img->name))) {

216 /* TODO throw some sort of warning? */

217 /* TODO implement some sort of module priority or let the user specify? */

218 if(!(mod = img_get_module(0))) {

219 return -1;

220 }

221 }

222

223 return mod->write(img, io);

224 }

225

226 int img_to_float(struct img_pixmap *img)

227 {

228 enum img_fmt targ_fmt;

229

230 switch(img->fmt) {

231 case IMG_FMT_GREY8:

232 targ_fmt = IMG_FMT_GREYF;

233 break;

234

235 case IMG_FMT_RGB24:

236 targ_fmt = IMG_FMT_RGBF;

237 break;

238

239 case IMG_FMT_RGBA32:

240 targ_fmt = IMG_FMT_RGBAF;

241 break;

242

243 default:

244 return 0; /* already float */

245 }

246

247 return img_convert(img, targ_fmt);

248 }

249

250 int img_to_integer(struct img_pixmap *img)

251 {

252 enum img_fmt targ_fmt;

253

254 switch(img->fmt) {

255 case IMG_FMT_GREYF:

256 targ_fmt = IMG_FMT_GREY8;

257 break;

258

259 case IMG_FMT_RGBF:

260 targ_fmt = IMG_FMT_RGB24;

261 break;

262

263 case IMG_FMT_RGBAF:

264 targ_fmt = IMG_FMT_RGBA32;

265 break;

266

267 default:

268 return 0; /* already integer */

269 }

270

271 return img_convert(img, targ_fmt);

272 }

273

274 int img_is_float(struct img_pixmap *img)

275 {

276 return img->fmt >= IMG_FMT_GREYF && img->fmt <= IMG_FMT_RGBAF;

277 }

278

279 int img_has_alpha(struct img_pixmap *img)

280 {

281 return img->fmt >= IMG_FMT_GREY8 && img->fmt <= IMG_FMT_RGBA32;

282 }

283

284 void img_io_set_user_data(struct img_io *io, void *uptr)

285 {

286 io->uptr = uptr;

287 }

288

289 void img_io_set_read_func(struct img_io *io, size_t (*read)(void*, size_t, void*))

290 {

291 io->read = read;

292 }

293

294 void img_io_set_write_func(struct img_io *io, size_t (*write)(void*, size_t, void*))

295 {

296 io->write = write;

297 }

298

299 void img_io_set_seek_func(struct img_io *io, long (*seek)(long, int, void*))

300 {

301 io->seek = seek;

302 }

303

304

305 static int pixel_size(enum img_fmt fmt)

306 {

307 switch(fmt) {

308 case IMG_FMT_GREY8:

309 return 1;

310 case IMG_FMT_RGB24:

311 return 3;

312 case IMG_FMT_RGBA32:

313 return 4;

314 case IMG_FMT_GREYF:

315 return sizeof(float);

316 case IMG_FMT_RGBF:

317 return 3 * sizeof(float);

318 case IMG_FMT_RGBAF:

319 return 4 * sizeof(float);

320 default:

321 break;

322 }

323 return 0;

324 }

325

326 static size_t def_read(void *buf, size_t bytes, void *uptr)

327 {

328 return uptr ? fread(buf, 1, bytes, uptr) : 0;

329 }

330

331 static size_t def_write(void *buf, size_t bytes, void *uptr)

332 {

333 return uptr ? fwrite(buf, 1, bytes, uptr) : 0;

334 }

335

336 static long def_seek(long offset, int whence, void *uptr)

337 {

338 if(!uptr || fseek(uptr, offset, whence) == -1) {

339 return -1;

340 }

341 return ftell(uptr);

342 }

343