1 2 /* IMGFILE module - Interface to sgi libimage */ 3 4 /* XXX This module should be done better at some point. It should return 5 ** an object of image file class, and have routines to manipulate these 6 ** image files in a neater way (so you can get rgb images off a greyscale 7 ** file, for instance, or do a straight display without having to get the 8 ** image bits into python, etc). 9 ** 10 ** Warning: this module is very non-reentrant (esp. the readscaled stuff) 11 */ 12 13 #include "Python.h" 14 15 #include <gl/image.h> 16 17 #include "/usr/people/4Dgifts/iristools/include/izoom.h" 18 19 /* Bunch of missing extern decls; keep gcc -Wall happy... */ 20 extern void i_seterror(); 21 extern void iclose(); 22 extern void filterzoom(); 23 extern void putrow(); 24 extern void getrow(); 25 26 static PyObject * ImgfileError; /* Exception we raise for various trouble */ 27 28 static int top_to_bottom; /* True if we want top-to-bottom images */ 29 30 /* The image library does not always call the error hander :-(, 31 therefore we have a global variable indicating that it was called. 32 It is cleared by imgfile_open(). */ 33 34 static int error_called; 35 36 37 /* The error handler */ 38 39 static void 40 imgfile_error(char *str) 41 { 42 PyErr_SetString(ImgfileError, str); 43 error_called = 1; 44 return; /* To imglib, which will return a failure indicator */ 45 } 46 47 48 /* Open an image file and return a pointer to it. 49 Make sure we raise an exception if we fail. */ 50 51 static IMAGE * 52 imgfile_open(char *fname) 53 { 54 IMAGE *image; 55 i_seterror(imgfile_error); 56 error_called = 0; 57 errno = 0; 58 if ( (image = iopen(fname, "r")) == NULL ) { 59 /* Error may already be set by imgfile_error */ 60 if ( !error_called ) { 61 if (errno) 62 PyErr_SetFromErrno(ImgfileError); 63 else 64 PyErr_SetString(ImgfileError, 65 "Can't open image file"); 66 } 67 return NULL; 68 } 69 return image; 70 } 71 72 static PyObject * 73 imgfile_ttob(PyObject *self, PyObject *args) 74 { 75 int newval; 76 PyObject *rv; 77 78 if (!PyArg_ParseTuple(args, "i:ttob", &newval)) 79 return NULL; 80 rv = PyInt_FromLong(top_to_bottom); 81 top_to_bottom = newval; 82 return rv; 83 } 84 85 static PyObject * 86 imgfile_read(PyObject *self, PyObject *args) 87 { 88 char *fname; 89 PyObject *rv; 90 int xsize, ysize, zsize; 91 char *cdatap; 92 long *idatap; 93 static short rs[8192], gs[8192], bs[8192]; 94 int x, y; 95 IMAGE *image; 96 int yfirst, ylast, ystep; 97 98 if ( !PyArg_ParseTuple(args, "s:read", &fname) ) 99 return NULL; 100 101 if ( (image = imgfile_open(fname)) == NULL ) 102 return NULL; 103 104 if ( image->colormap != CM_NORMAL ) { 105 iclose(image); 106 PyErr_SetString(ImgfileError, 107 "Can only handle CM_NORMAL images"); 108 return NULL; 109 } 110 if ( BPP(image->type) != 1 ) { 111 iclose(image); 112 PyErr_SetString(ImgfileError, 113 "Can't handle imgfiles with bpp!=1"); 114 return NULL; 115 } 116 xsize = image->xsize; 117 ysize = image->ysize; 118 zsize = image->zsize; 119 if ( zsize != 1 && zsize != 3) { 120 iclose(image); 121 PyErr_SetString(ImgfileError, 122 "Can only handle 1 or 3 byte pixels"); 123 return NULL; 124 } 125 if ( xsize > 8192 ) { 126 iclose(image); 127 PyErr_SetString(ImgfileError, 128 "Can't handle image with > 8192 columns"); 129 return NULL; 130 } 131 132 if ( zsize == 3 ) zsize = 4; 133 rv = PyString_FromStringAndSize((char *)NULL, xsize*ysize*zsize); 134 if ( rv == NULL ) { 135 iclose(image); 136 return NULL; 137 } 138 cdatap = PyString_AsString(rv); 139 idatap = (long *)cdatap; 140 141 if (top_to_bottom) { 142 yfirst = ysize-1; 143 ylast = -1; 144 ystep = -1; 145 } else { 146 yfirst = 0; 147 ylast = ysize; 148 ystep = 1; 149 } 150 for ( y=yfirst; y != ylast && !error_called; y += ystep ) { 151 if ( zsize == 1 ) { 152 getrow(image, rs, y, 0); 153 for(x=0; x<xsize; x++ ) 154 *cdatap++ = rs[x]; 155 } else { 156 getrow(image, rs, y, 0); 157 getrow(image, gs, y, 1); 158 getrow(image, bs, y, 2); 159 for(x=0; x<xsize; x++ ) 160 *idatap++ = (rs[x] & 0xff) | 161 ((gs[x] & 0xff)<<8) | 162 ((bs[x] & 0xff)<<16); 163 } 164 } 165 iclose(image); 166 if ( error_called ) { 167 Py_DECREF(rv); 168 return NULL; 169 } 170 return rv; 171 } 172 173 static IMAGE *glob_image; 174 static long *glob_datap; 175 static int glob_width, glob_z, glob_ysize; 176 177 static void 178 xs_get(short *buf, int y) 179 { 180 if (top_to_bottom) 181 getrow(glob_image, buf, (glob_ysize-1-y), glob_z); 182 else 183 getrow(glob_image, buf, y, glob_z); 184 } 185 186 static void 187 xs_put_c(short *buf, int y) 188 { 189 char *datap = (char *)glob_datap + y*glob_width; 190 int width = glob_width; 191 192 while ( width-- ) 193 *datap++ = (*buf++) & 0xff; 194 } 195 196 static void 197 xs_put_0(short *buf, int y) 198 { 199 long *datap = glob_datap + y*glob_width; 200 int width = glob_width; 201 202 while ( width-- ) 203 *datap++ = (*buf++) & 0xff; 204 } 205 static void 206 xs_put_12(short *buf, int y) 207 { 208 long *datap = glob_datap + y*glob_width; 209 int width = glob_width; 210 211 while ( width-- ) 212 *datap++ |= ((*buf++) & 0xff) << (glob_z*8); 213 } 214 215 static void 216 xscale(IMAGE *image, int xsize, int ysize, int zsize, 217 long *datap, int xnew, int ynew, int fmode, double blur) 218 { 219 glob_image = image; 220 glob_datap = datap; 221 glob_width = xnew; 222 glob_ysize = ysize; 223 if ( zsize == 1 ) { 224 glob_z = 0; 225 filterzoom(xs_get, xs_put_c, xsize, ysize, 226 xnew, ynew, fmode, blur); 227 } else { 228 glob_z = 0; 229 filterzoom(xs_get, xs_put_0, xsize, ysize, 230 xnew, ynew, fmode, blur); 231 glob_z = 1; 232 filterzoom(xs_get, xs_put_12, xsize, ysize, 233 xnew, ynew, fmode, blur); 234 glob_z = 2; 235 filterzoom(xs_get, xs_put_12, xsize, ysize, 236 xnew, ynew, fmode, blur); 237 } 238 } 239 240 241 static PyObject * 242 imgfile_readscaled(PyObject *self, PyObject *args) 243 { 244 char *fname; 245 PyObject *rv; 246 int xsize, ysize, zsize; 247 char *cdatap; 248 long *idatap; 249 static short rs[8192], gs[8192], bs[8192]; 250 int x, y; 251 int xwtd, ywtd, xorig, yorig; 252 float xfac, yfac; 253 IMAGE *image; 254 char *filter; 255 double blur = 1.0; 256 int extended; 257 int fmode = 0; 258 int yfirst, ylast, ystep; 259 260 /* 261 ** Parse args. Funny, since arg 4 and 5 are optional 262 ** (filter name and blur factor). Also, 4 or 5 arguments indicates 263 ** extended scale algorithm in stead of simple-minded pixel drop/dup. 264 */ 265 extended = PyTuple_Size(args) >= 4; 266 if ( !PyArg_ParseTuple(args, "sii|sd", 267 &fname, &xwtd, &ywtd, &filter, &blur) ) 268 return NULL; 269 270 /* 271 ** Check parameters, open file and check type, rows, etc. 272 */ 273 if ( extended ) { 274 if ( strcmp(filter, "impulse") == 0 ) 275 fmode = IMPULSE; 276 else if ( strcmp( filter, "box") == 0 ) 277 fmode = BOX; 278 else if ( strcmp( filter, "triangle") == 0 ) 279 fmode = TRIANGLE; 280 else if ( strcmp( filter, "quadratic") == 0 ) 281 fmode = QUADRATIC; 282 else if ( strcmp( filter, "gaussian") == 0 ) 283 fmode = GAUSSIAN; 284 else { 285 PyErr_SetString(ImgfileError, "Unknown filter type"); 286 return NULL; 287 } 288 } 289 290 if ( (image = imgfile_open(fname)) == NULL ) 291 return NULL; 292 293 if ( image->colormap != CM_NORMAL ) { 294 iclose(image); 295 PyErr_SetString(ImgfileError, 296 "Can only handle CM_NORMAL images"); 297 return NULL; 298 } 299 if ( BPP(image->type) != 1 ) { 300 iclose(image); 301 PyErr_SetString(ImgfileError, 302 "Can't handle imgfiles with bpp!=1"); 303 return NULL; 304 } 305 xsize = image->xsize; 306 ysize = image->ysize; 307 zsize = image->zsize; 308 if ( zsize != 1 && zsize != 3) { 309 iclose(image); 310 PyErr_SetString(ImgfileError, 311 "Can only handle 1 or 3 byte pixels"); 312 return NULL; 313 } 314 if ( xsize > 8192 ) { 315 iclose(image); 316 PyErr_SetString(ImgfileError, 317 "Can't handle image with > 8192 columns"); 318 return NULL; 319 } 320 321 if ( zsize == 3 ) zsize = 4; 322 rv = PyString_FromStringAndSize(NULL, xwtd*ywtd*zsize); 323 if ( rv == NULL ) { 324 iclose(image); 325 return NULL; 326 } 327 PyFPE_START_PROTECT("readscaled", return 0) 328 xfac = (float)xsize/(float)xwtd; 329 yfac = (float)ysize/(float)ywtd; 330 PyFPE_END_PROTECT(yfac) 331 cdatap = PyString_AsString(rv); 332 idatap = (long *)cdatap; 333 334 if ( extended ) { 335 xscale(image, xsize, ysize, zsize, 336 idatap, xwtd, ywtd, fmode, blur); 337 } else { 338 if (top_to_bottom) { 339 yfirst = ywtd-1; 340 ylast = -1; 341 ystep = -1; 342 } else { 343 yfirst = 0; 344 ylast = ywtd; 345 ystep = 1; 346 } 347 for ( y=yfirst; y != ylast && !error_called; y += ystep ) { 348 yorig = (int)(y*yfac); 349 if ( zsize == 1 ) { 350 getrow(image, rs, yorig, 0); 351 for(x=0; x<xwtd; x++ ) { 352 *cdatap++ = rs[(int)(x*xfac)]; 353 } 354 } else { 355 getrow(image, rs, yorig, 0); 356 getrow(image, gs, yorig, 1); 357 getrow(image, bs, yorig, 2); 358 for(x=0; x<xwtd; x++ ) { 359 xorig = (int)(x*xfac); 360 *idatap++ = (rs[xorig] & 0xff) | 361 ((gs[xorig] & 0xff)<<8) | 362 ((bs[xorig] & 0xff)<<16); 363 } 364 } 365 } 366 } 367 iclose(image); 368 if ( error_called ) { 369 Py_DECREF(rv); 370 return NULL; 371 } 372 return rv; 373 } 374 375 static PyObject * 376 imgfile_getsizes(PyObject *self, PyObject *args) 377 { 378 char *fname; 379 PyObject *rv; 380 IMAGE *image; 381 382 if ( !PyArg_ParseTuple(args, "s:getsizes", &fname) ) 383 return NULL; 384 385 if ( (image = imgfile_open(fname)) == NULL ) 386 return NULL; 387 rv = Py_BuildValue("(iii)", image->xsize, image->ysize, image->zsize); 388 iclose(image); 389 return rv; 390 } 391 392 static PyObject * 393 imgfile_write(PyObject *self, PyObject *args) 394 { 395 IMAGE *image; 396 char *fname; 397 int xsize, ysize, zsize, len; 398 char *cdatap; 399 long *idatap; 400 short rs[8192], gs[8192], bs[8192]; 401 short r, g, b; 402 long rgb; 403 int x, y; 404 int yfirst, ylast, ystep; 405 406 407 if ( !PyArg_ParseTuple(args, "ss#iii:write", 408 &fname, &cdatap, &len, &xsize, &ysize, &zsize) ) 409 return NULL; 410 411 if ( zsize != 1 && zsize != 3 ) { 412 PyErr_SetString(ImgfileError, 413 "Can only handle 1 or 3 byte pixels"); 414 return NULL; 415 } 416 if ( len != xsize * ysize * (zsize == 1 ? 1 : 4) ) { 417 PyErr_SetString(ImgfileError, "Data does not match sizes"); 418 return NULL; 419 } 420 if ( xsize > 8192 ) { 421 PyErr_SetString(ImgfileError, 422 "Can't handle image with > 8192 columns"); 423 return NULL; 424 } 425 426 error_called = 0; 427 errno = 0; 428 image =iopen(fname, "w", RLE(1), 3, xsize, ysize, zsize); 429 if ( image == 0 ) { 430 if ( ! error_called ) { 431 if (errno) 432 PyErr_SetFromErrno(ImgfileError); 433 else 434 PyErr_SetString(ImgfileError, 435 "Can't create image file"); 436 } 437 return NULL; 438 } 439 440 idatap = (long *)cdatap; 441 442 if (top_to_bottom) { 443 yfirst = ysize-1; 444 ylast = -1; 445 ystep = -1; 446 } else { 447 yfirst = 0; 448 ylast = ysize; 449 ystep = 1; 450 } 451 for ( y=yfirst; y != ylast && !error_called; y += ystep ) { 452 if ( zsize == 1 ) { 453 for( x=0; x<xsize; x++ ) 454 rs[x] = *cdatap++; 455 putrow(image, rs, y, 0); 456 } else { 457 for( x=0; x<xsize; x++ ) { 458 rgb = *idatap++; 459 r = rgb & 0xff; 460 g = (rgb >> 8 ) & 0xff; 461 b = (rgb >> 16 ) & 0xff; 462 rs[x] = r; 463 gs[x] = g; 464 bs[x] = b; 465 } 466 putrow(image, rs, y, 0); 467 putrow(image, gs, y, 1); 468 putrow(image, bs, y, 2); 469 } 470 } 471 iclose(image); 472 if ( error_called ) 473 return NULL; 474 Py_INCREF(Py_None); 475 return Py_None; 476 477 } 478 479 480 static PyMethodDef imgfile_methods[] = { 481 { "getsizes", imgfile_getsizes, METH_VARARGS }, 482 { "read", imgfile_read, METH_VARARGS }, 483 { "readscaled", imgfile_readscaled, METH_VARARGS}, 484 { "write", imgfile_write, METH_VARARGS }, 485 { "ttob", imgfile_ttob, METH_VARARGS }, 486 { NULL, NULL } /* Sentinel */ 487 }; 488 489 490 void 491 initimgfile(void) 492 { 493 PyObject *m, *d; 494 495 if (PyErr_WarnPy3k("the imgfile module has been removed in " 496 "Python 3.0", 2) < 0) 497 return; 498 499 m = Py_InitModule("imgfile", imgfile_methods); 500 if (m == NULL) 501 return; 502 d = PyModule_GetDict(m); 503 ImgfileError = PyErr_NewException("imgfile.error", NULL, NULL); 504 if (ImgfileError != NULL) 505 PyDict_SetItemString(d, "error", ImgfileError); 506 } 507 508 509 510