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Guido van Rossumaa9de671992-03-04 16:40:03 +00001
Guido van Rossuma5f61381992-09-03 20:41:22 +00002/* IMGFILE module - Interface to sgi libimage */
Guido van Rossumaa9de671992-03-04 16:40:03 +00003
Thomas Wouters7e474022000-07-16 12:04:32 +00004/* XXX This module should be done better at some point. It should return
Guido van Rossumaa9de671992-03-04 16:40:03 +00005** 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).
Jack Jansen3c2eb5c1993-01-19 15:17:13 +00009**
10** Warning: this module is very non-reentrant (esp. the readscaled stuff)
Guido van Rossumaa9de671992-03-04 16:40:03 +000011*/
12
Roger E. Masse7f33e401996-12-20 21:56:08 +000013#include "Python.h"
Guido van Rossumaa9de671992-03-04 16:40:03 +000014
15#include <gl/image.h>
16
Jack Jansen09cbf9a1993-01-19 15:33:13 +000017#include "/usr/people/4Dgifts/iristools/include/izoom.h"
Jack Jansen3c2eb5c1993-01-19 15:17:13 +000018
Guido van Rossum665f9191996-12-09 18:49:42 +000019/* Bunch of missing extern decls; keep gcc -Wall happy... */
20extern void i_seterror();
21extern void iclose();
22extern void filterzoom();
23extern void putrow();
24extern void getrow();
25
Roger E. Masse7f33e401996-12-20 21:56:08 +000026static PyObject * ImgfileError; /* Exception we raise for various trouble */
Guido van Rossumaa9de671992-03-04 16:40:03 +000027
Sjoerd Mullendera9c3c221993-10-11 12:54:31 +000028static int top_to_bottom; /* True if we want top-to-bottom images */
Guido van Rossumaa9de671992-03-04 16:40:03 +000029
Guido van Rossuma5f61381992-09-03 20:41:22 +000030/* 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(). */
Guido van Rossumaa9de671992-03-04 16:40:03 +000033
Guido van Rossum3e941971992-03-23 18:21:32 +000034static int error_called;
35
Guido van Rossuma5f61381992-09-03 20:41:22 +000036
37/* The error handler */
38
Guido van Rossuma376cc51996-12-05 23:43:35 +000039static void
Peter Schneider-Kamp6a850272000-07-10 17:04:33 +000040imgfile_error(char *str)
Guido van Rossum3e941971992-03-23 18:21:32 +000041{
Roger E. Masse7f33e401996-12-20 21:56:08 +000042 PyErr_SetString(ImgfileError, str);
43 error_called = 1;
44 return; /* To imglib, which will return a failure indicator */
Guido van Rossum3e941971992-03-23 18:21:32 +000045}
Guido van Rossumaa9de671992-03-04 16:40:03 +000046
Guido van Rossuma5f61381992-09-03 20:41:22 +000047
48/* Open an image file and return a pointer to it.
49 Make sure we raise an exception if we fail. */
50
51static IMAGE *
Peter Schneider-Kamp6a850272000-07-10 17:04:33 +000052imgfile_open(char *fname)
Guido van Rossum2c4be641992-06-03 17:06:36 +000053{
Roger E. Masse7f33e401996-12-20 21:56:08 +000054 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;
Guido van Rossumaa9de671992-03-04 16:40:03 +000068 }
Roger E. Masse7f33e401996-12-20 21:56:08 +000069 return image;
70}
71
72static PyObject *
Peter Schneider-Kamp6a850272000-07-10 17:04:33 +000073imgfile_ttob(PyObject *self, PyObject *args)
Roger E. Masse7f33e401996-12-20 21:56:08 +000074{
75 int newval;
76 PyObject *rv;
77
Neal Norwitzb82d34f2002-03-31 15:43:28 +000078 if (!PyArg_ParseTuple(args, "i:ttob", &newval))
Roger E. Masse7f33e401996-12-20 21:56:08 +000079 return NULL;
80 rv = PyInt_FromLong(top_to_bottom);
81 top_to_bottom = newval;
82 return rv;
83}
84
85static PyObject *
Peter Schneider-Kamp6a850272000-07-10 17:04:33 +000086imgfile_read(PyObject *self, PyObject *args)
Roger E. Masse7f33e401996-12-20 21:56:08 +000087{
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
Neal Norwitzb82d34f2002-03-31 15:43:28 +000098 if ( !PyArg_ParseTuple(args, "s:read", &fname) )
Roger E. Masse7f33e401996-12-20 21:56:08 +000099 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;
Guido van Rossumaa9de671992-03-04 16:40:03 +0000171}
172
Guido van Rossum234f9421993-06-17 12:35:49 +0000173static IMAGE *glob_image;
174static long *glob_datap;
Sjoerd Mullendera9c3c221993-10-11 12:54:31 +0000175static int glob_width, glob_z, glob_ysize;
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000176
Guido van Rossuma376cc51996-12-05 23:43:35 +0000177static void
Peter Schneider-Kamp6a850272000-07-10 17:04:33 +0000178xs_get(short *buf, int y)
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000179{
Roger E. Masse7f33e401996-12-20 21:56:08 +0000180 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);
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000184}
185
Guido van Rossuma376cc51996-12-05 23:43:35 +0000186static void
Peter Schneider-Kamp6a850272000-07-10 17:04:33 +0000187xs_put_c(short *buf, int y)
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000188{
Roger E. Masse7f33e401996-12-20 21:56:08 +0000189 char *datap = (char *)glob_datap + y*glob_width;
190 int width = glob_width;
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000191
Roger E. Masse7f33e401996-12-20 21:56:08 +0000192 while ( width-- )
193 *datap++ = (*buf++) & 0xff;
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000194}
195
Guido van Rossuma376cc51996-12-05 23:43:35 +0000196static void
Peter Schneider-Kamp6a850272000-07-10 17:04:33 +0000197xs_put_0(short *buf, int y)
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000198{
Roger E. Masse7f33e401996-12-20 21:56:08 +0000199 long *datap = glob_datap + y*glob_width;
200 int width = glob_width;
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000201
Roger E. Masse7f33e401996-12-20 21:56:08 +0000202 while ( width-- )
203 *datap++ = (*buf++) & 0xff;
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000204}
Guido van Rossuma376cc51996-12-05 23:43:35 +0000205static void
Peter Schneider-Kamp6a850272000-07-10 17:04:33 +0000206xs_put_12(short *buf, int y)
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000207{
Roger E. Masse7f33e401996-12-20 21:56:08 +0000208 long *datap = glob_datap + y*glob_width;
209 int width = glob_width;
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000210
Roger E. Masse7f33e401996-12-20 21:56:08 +0000211 while ( width-- )
212 *datap++ |= ((*buf++) & 0xff) << (glob_z*8);
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000213}
214
215static void
Peter Schneider-Kamp6a850272000-07-10 17:04:33 +0000216xscale(IMAGE *image, int xsize, int ysize, int zsize,
217 long *datap, int xnew, int ynew, int fmode, double blur)
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000218{
Roger E. Masse7f33e401996-12-20 21:56:08 +0000219 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 }
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000238}
239
Guido van Rossuma5f61381992-09-03 20:41:22 +0000240
Roger E. Masse7f33e401996-12-20 21:56:08 +0000241static PyObject *
Peter Schneider-Kamp6a850272000-07-10 17:04:33 +0000242imgfile_readscaled(PyObject *self, PyObject *args)
Guido van Rossum2c4be641992-06-03 17:06:36 +0000243{
Roger E. Masse7f33e401996-12-20 21:56:08 +0000244 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;
Roger E. Masse7f33e401996-12-20 21:56:08 +0000253 IMAGE *image;
254 char *filter;
Neal Norwitzb82d34f2002-03-31 15:43:28 +0000255 double blur = 1.0;
Roger E. Masse7f33e401996-12-20 21:56:08 +0000256 int extended;
257 int fmode = 0;
258 int yfirst, ylast, ystep;
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000259
Roger E. Masse7f33e401996-12-20 21:56:08 +0000260 /*
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 */
Neal Norwitzb82d34f2002-03-31 15:43:28 +0000265 extended = PyTuple_Size(args) >= 4;
266 if ( !PyArg_ParseTuple(args, "sii|sd",
267 &fname, &xwtd, &ywtd, &filter, &blur) )
Roger E. Masse7f33e401996-12-20 21:56:08 +0000268 return NULL;
Guido van Rossum2c4be641992-06-03 17:06:36 +0000269
Roger E. Masse7f33e401996-12-20 21:56:08 +0000270 /*
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 }
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000288 }
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000289
Roger E. Masse7f33e401996-12-20 21:56:08 +0000290 if ( (image = imgfile_open(fname)) == NULL )
291 return NULL;
Guido van Rossum2c4be641992-06-03 17:06:36 +0000292
Roger E. Masse7f33e401996-12-20 21:56:08 +0000293 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 }
Guido van Rossum2c4be641992-06-03 17:06:36 +0000320
Roger E. Masse7f33e401996-12-20 21:56:08 +0000321 if ( zsize == 3 ) zsize = 4;
322 rv = PyString_FromStringAndSize(NULL, xwtd*ywtd*zsize);
323 if ( rv == NULL ) {
324 iclose(image);
325 return NULL;
326 }
Guido van Rossum52fa3a61997-02-14 22:59:58 +0000327 PyFPE_START_PROTECT("readscaled", return 0)
Roger E. Masse7f33e401996-12-20 21:56:08 +0000328 xfac = (float)xsize/(float)xwtd;
329 yfac = (float)ysize/(float)ywtd;
Guido van Rossum45b83911997-03-14 04:32:50 +0000330 PyFPE_END_PROTECT(yfac)
Roger E. Masse7f33e401996-12-20 21:56:08 +0000331 cdatap = PyString_AsString(rv);
332 idatap = (long *)cdatap;
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000333
Roger E. Masse7f33e401996-12-20 21:56:08 +0000334 if ( extended ) {
335 xscale(image, xsize, ysize, zsize,
336 idatap, xwtd, ywtd, fmode, blur);
Sjoerd Mullendera9c3c221993-10-11 12:54:31 +0000337 } else {
Roger E. Masse7f33e401996-12-20 21:56:08 +0000338 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
375static PyObject *
Peter Schneider-Kamp6a850272000-07-10 17:04:33 +0000376imgfile_getsizes(PyObject *self, PyObject *args)
Roger E. Masse7f33e401996-12-20 21:56:08 +0000377{
378 char *fname;
379 PyObject *rv;
380 IMAGE *image;
381
Neal Norwitzb82d34f2002-03-31 15:43:28 +0000382 if ( !PyArg_ParseTuple(args, "s:getsizes", &fname) )
Roger E. Masse7f33e401996-12-20 21:56:08 +0000383 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
392static PyObject *
Peter Schneider-Kamp6a850272000-07-10 17:04:33 +0000393imgfile_write(PyObject *self, PyObject *args)
Roger E. Masse7f33e401996-12-20 21:56:08 +0000394{
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
Neal Norwitzb82d34f2002-03-31 15:43:28 +0000407 if ( !PyArg_ParseTuple(args, "ss#iii:write",
Roger E. Masse7f33e401996-12-20 21:56:08 +0000408 &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;
Sjoerd Mullendera9c3c221993-10-11 12:54:31 +0000450 }
451 for ( y=yfirst; y != ylast && !error_called; y += ystep ) {
Roger E. Masse7f33e401996-12-20 21:56:08 +0000452 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);
Jack Jansen3c2eb5c1993-01-19 15:17:13 +0000469 }
Guido van Rossum2c4be641992-06-03 17:06:36 +0000470 }
Roger E. Masse7f33e401996-12-20 21:56:08 +0000471 iclose(image);
472 if ( error_called )
473 return NULL;
474 Py_INCREF(Py_None);
475 return Py_None;
Jack Jansen3accf981992-08-20 11:54:27 +0000476
477}
Guido van Rossumaa9de671992-03-04 16:40:03 +0000478
Guido van Rossuma5f61381992-09-03 20:41:22 +0000479
Roger E. Masse7f33e401996-12-20 21:56:08 +0000480static PyMethodDef imgfile_methods[] = {
Neal Norwitzb82d34f2002-03-31 15:43:28 +0000481 { "getsizes", imgfile_getsizes, METH_VARARGS },
482 { "read", imgfile_read, METH_VARARGS },
Martin v. Löwis43b936d2002-01-17 23:15:58 +0000483 { "readscaled", imgfile_readscaled, METH_VARARGS},
Neal Norwitzb82d34f2002-03-31 15:43:28 +0000484 { "write", imgfile_write, METH_VARARGS },
485 { "ttob", imgfile_ttob, METH_VARARGS },
Roger E. Masse7f33e401996-12-20 21:56:08 +0000486 { NULL, NULL } /* Sentinel */
Guido van Rossumaa9de671992-03-04 16:40:03 +0000487};
488
489
490void
Thomas Woutersf3f33dc2000-07-21 06:00:07 +0000491initimgfile(void)
Guido van Rossumaa9de671992-03-04 16:40:03 +0000492{
Roger E. Masse7f33e401996-12-20 21:56:08 +0000493 PyObject *m, *d;
494 m = Py_InitModule("imgfile", imgfile_methods);
Neal Norwitz1ac754f2006-01-19 06:09:39 +0000495 if (m == NULL)
496 return;
Roger E. Masse7f33e401996-12-20 21:56:08 +0000497 d = PyModule_GetDict(m);
Guido van Rossum0cb96de1997-10-01 04:29:29 +0000498 ImgfileError = PyErr_NewException("imgfile.error", NULL, NULL);
499 if (ImgfileError != NULL)
500 PyDict_SetItemString(d, "error", ImgfileError);
Guido van Rossumaa9de671992-03-04 16:40:03 +0000501}
Roger E. Masse7f33e401996-12-20 21:56:08 +0000502
503
504