1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
|
/* xpmtoppm.c - read an X11 pixmap file and produce a portable pixmap
**
** Copyright (C) 1991 by Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
**
** Upgraded to handle XPM version 3 by
** Arnaud Le Hors (lehors@mirsa.inria.fr)
** Tue Apr 9 1991
**
** Rainer Sinkwitz sinkwitz@ifi.unizh.ch - 21 Nov 91:
** - Bug fix, no advance of read ptr, would not read
** colors like "ac c black" because it would find
** the "c" of "ac" and then had problems with "c"
** as color.
**
** - Now understands multiword X11 color names
**
** - Now reads multiple color keys. Takes the color
** of the hightest available key. Lines no longer need
** to begin with key 'c'.
**
** - expanded line buffer to from 500 to 2048 for bigger files
*/
#define _BSD_SOURCE /* Make sure strdup() is in string.h */
#define _XOPEN_SOURCE 500 /* Make sure strdup() is in string.h */
#include <assert.h>
#include <string.h>
#include "pm_c_util.h"
#include "mallocvar.h"
#include "shhopt.h"
#include "nstring.h"
#include "ppm.h"
#define MAX_LINE (8 * 1024)
/* The maximum size XPM input line we can handle. */
/* number of xpmColorKeys */
#define NKEYS 5
const char *xpmColorKeys[] =
{
"s", /* key #1: symbol */
"m", /* key #2: mono visual */
"g4", /* key #3: 4 grays visual */
"g", /* key #4: gray visual */
"c", /* key #5: color visual */
};
struct cmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char * input_filespec; /* Filespecs of input files */
const char * alpha_filename;
int alpha_stdout;
int verbose;
};
static int verbose;
static void
parseCommandLine(int argc, char ** argv,
struct cmdlineInfo *cmdlineP) {
/*----------------------------------------------------------------------------
Note that the file spec array we return is stored in the storage that
was passed to us as the argv array.
-----------------------------------------------------------------------------*/
optEntry * option_def;
/* Instructions to OptParseOptions2 on how to parse our options.
*/
optStruct3 opt;
unsigned int option_def_index;
MALLOCARRAY_NOFAIL(option_def, 100);
option_def_index = 0; /* incremented by OPTENT3 */
OPTENT3(0, "alphaout", OPT_STRING, &cmdlineP->alpha_filename,
NULL, 0);
OPTENT3(0, "verbose", OPT_FLAG, &cmdlineP->verbose,
NULL, 0);
cmdlineP->alpha_filename = NULL;
cmdlineP->verbose = FALSE;
opt.opt_table = option_def;
opt.short_allowed = FALSE; /* We have no short (old-fashioned) options */
opt.allowNegNum = TRUE; /* We may have parms that are negative numbers */
pm_optParseOptions3(&argc, argv, opt, sizeof(opt), 0);
/* Uses and sets argc, argv, and some of *cmdlineP and others. */
if (argc - 1 == 0)
cmdlineP->input_filespec = NULL; /* he wants stdin */
else if (argc - 1 == 1)
cmdlineP->input_filespec = strdup(argv[1]);
else
pm_error("Too many arguments. The only argument accepted\n"
"is the input file specification");
if (cmdlineP->alpha_filename &&
streq(cmdlineP->alpha_filename, "-"))
cmdlineP->alpha_stdout = TRUE;
else
cmdlineP->alpha_stdout = FALSE;
}
static char lastInputLine[MAX_LINE+1];
/* contents of line most recently read from input */
static bool backup;
/* TRUE means next read should be a reread of the most recently read
line, i.e. lastInputLine, instead of a read from the input file.
*/
static void
getline(char * const line,
size_t const size,
FILE * const stream) {
/*----------------------------------------------------------------------------
Read the next line from the input file 'stream', through the one-line
buffer lastInputLine[].
If 'backup' is true, the "next line" is the previously read line, i.e.
the one in that one-line buffer. Otherwise, the "next line" is the next
line from the real file. After reading the backed up line, we reset
'backup' to false.
Return the line as a null terminated string in *line, which is an
array of 'size' bytes.
Exit program if the line doesn't fit in the buffer.
-----------------------------------------------------------------------------*/
if (size > sizeof(lastInputLine))
pm_error("INTERNAL ERROR: getline() received 'size' parameter "
"which is out of bounds");
if (backup) {
strncpy(line, lastInputLine, size);
backup = FALSE;
} else {
if (fgets(line, size, stream) == NULL)
pm_error("EOF or read error on input file");
if (strlen(line) == size - 1)
pm_error("Input file has line that is too long (longer than "
"%u bytes).", (unsigned)size - 1);
STRSCPY(lastInputLine, line);
}
}
static unsigned int
getColorNumber(const char * const pArg,
unsigned int const bytesPerPixel,
unsigned int const ncolors) {
/*----------------------------------------------------------------------------
Return the color number (palette index) at 'p'.
It occupies 'bytesPerPixel' bytes.
Abort program if the number is too large for the format described
by 'bytesPerPixel' and 'ncolors'.
-----------------------------------------------------------------------------*/
/* Color number is encoded as pure binary, big-endian, unsigned.
(which is stupid, since the rest of the file is text)
*/
const unsigned char * const p = (const unsigned char *)pArg;
unsigned int retval;
const unsigned char * q;
assert(bytesPerPixel <= sizeof(unsigned int));
for (q = p, retval = 0; q < p + bytesPerPixel; ++q)
retval = (retval << 8) + *q;
if (bytesPerPixel > 2 && retval >= ncolors)
pm_error("Color number %u in color map is too large, as the "
"header says there are only %u colors in the image",
retval, ncolors);
return retval;
}
static void
getword(char * const output, char ** const cursorP) {
char *t1;
char *t2;
for (t1=*cursorP; ISSPACE(*t1); t1++); /* skip white space */
for (t2 = t1; !ISSPACE(*t2) && *t2 != '"' && *t2 != '\0'; t2++);
/* Move to next white space, ", or eol */
if (t2 > t1)
strncpy(output, t1, t2 - t1);
output[t2 - t1] = '\0';
*cursorP = t2;
}
static void
addToColorMap(unsigned int const seqNum,
unsigned int const colorNumber,
pixel * const colors,
unsigned int * const ptab,
char const colorspec[],
bool const isTransparent,
int * const transparentP) {
/*----------------------------------------------------------------------------
Add the color named by colorspec[] to the colormap contained in
'colors' and 'ptab', as the color associated with XPM color number
'colorNumber', which is the seqNum'th color in the XPM color map.
Iff 'transparent', set *transparentP to the colormap index that
corresponds to this color.
-----------------------------------------------------------------------------*/
if (ptab == NULL) {
/* Index into table. */
colors[colorNumber] = ppm_parsecolor(colorspec,
(pixval) PPM_MAXMAXVAL);
if (isTransparent)
*transparentP = colorNumber;
} else {
/* Set up linear search table. */
colors[seqNum] = ppm_parsecolor(colorspec,
(pixval) PPM_MAXMAXVAL);
ptab[seqNum] = colorNumber;
if (isTransparent)
*transparentP = seqNum;
}
}
static void
interpretXpm3ColorTableLine(char const line[],
unsigned int const seqNum,
unsigned int const charsPerPixel,
pixel * const colors,
unsigned int * const ptab,
unsigned int const ncolors,
int * const transparentP) {
/*----------------------------------------------------------------------------
Interpret one line of the color table in the XPM header. 'line' is
the line from the XPM file. It is the seqNum'th color table entry in
the file. The file uses 'charsPerPixel' characters per pixel.
Add the information from this color table entry to the color table
'colors' and, if it isn't NULL, the corresponding lookup shadow table
'ptab' (see readXpm3ColorTable for a description of these data
structures).
The line may include values for multiple kinds of color (grayscale,
color, etc.). We take the highest of these (e.g. color over grayscale).
If a color table entry indicates transparency, set *transparentP
to the colormap index that corresponds to the indicated color.
-----------------------------------------------------------------------------*/
/* Note: this code seems to allow for multi-word color specifications,
but I'm not aware that such are legal. Ultimately, ppm_parsecolor()
interprets the name, and I believe it only takes single word
color specifications. -Bryan 2001.05.06.
*/
char str2[MAX_LINE+1];
char *t1;
char *t2;
int endOfEntry; /* boolean */
unsigned int curkey, key, highkey; /* current color key */
unsigned int lastwaskey;
/* The last token we processes was a key, and we have processed
at least one token.
*/
char curbuf[BUFSIZ]; /* current buffer */
bool isTransparent;
unsigned int colorNumber;
/* A color number that appears in the raster */
/* read the chars */
t1 = strchr(line, '"');
if (t1 == NULL)
pm_error("A line that is supposed to be an entry in the color "
"table does not start with a quote. The line is '%s'. "
"It is the %uth entry in the color table.",
line, seqNum);
else
t1++; /* Points now to first color number character */
colorNumber = getColorNumber(t1, charsPerPixel, ncolors);
t1 += charsPerPixel;
/*
* read color keys and values
*/
curkey = 0;
highkey = 1;
lastwaskey = FALSE;
t2 = t1;
endOfEntry = FALSE;
while ( !endOfEntry ) {
int isKey; /* boolean */
getword(str2, &t2);
if (strlen(str2) == 0)
endOfEntry = TRUE;
else {
/* See if the word we got is a valid key (and get its key
number if so)
*/
for (key = 1;
key <= NKEYS && !streq(xpmColorKeys[key - 1], str2);
key++);
isKey = (key <= NKEYS);
if (lastwaskey || !isKey) {
/* This word is a color specification (or "none" for
transparent).
*/
if (!curkey)
pm_error("Missing color key token in color table line "
"'%s' before '%s'.", line, str2);
if (!lastwaskey)
strcat(curbuf, " "); /* append space */
if ( (strneq(str2, "None", 4))
|| (strneq(str2, "none", 4)) ) {
/* This entry identifies the transparent color number */
strcat(curbuf, "#000000"); /* Make it black */
isTransparent = TRUE;
} else
strcat(curbuf, str2); /* append buf */
lastwaskey = 0;
} else {
/* This word is a key. So we've seen the last of the
info for the previous key, and we must either put it
in the color map or ignore it if we already have a higher
color form in the colormap for this colormap entry.
*/
if (curkey > highkey) { /* flush string */
addToColorMap(seqNum, colorNumber, colors, ptab, curbuf,
isTransparent, transparentP);
highkey = curkey;
}
curkey = key; /* set new key */
curbuf[0] = '\0'; /* reset curbuf */
isTransparent = FALSE;
lastwaskey = 1;
}
if (*t2 == '"') break;
}
}
/* Put the info for the last key in the line into the colormap (or
ignore it if there's already a higher color form for this colormap
entry in it)
*/
if (curkey > highkey) {
addToColorMap(seqNum, colorNumber, colors, ptab, curbuf,
isTransparent, transparentP);
highkey = curkey;
}
if (highkey == 1)
pm_error("C error scanning color table");
}
static void
readXpm3Header(FILE * const stream,
int * const widthP,
int * const heightP,
unsigned int * const charsPerPixelP,
int * const nColorsP,
pixel ** const colorsP,
unsigned int ** const ptabP,
int * const transparentP) {
/*----------------------------------------------------------------------------
Read the header of the XPM file on stream 'stream'. Assume the
getline() stream is presently positioned to the beginning of the
file and it is a Version 3 XPM file. Leave the stream positioned
after the header.
We have two ways to return the colormap, depending on the number of
characters per pixel in the XPM:
If it is 1 or 2 characters per pixel, we return the colormap as a
Netpbm 'pixel' array *colorsP (in newly malloc'ed storage), such
that if a color in the raster is identified by index N, then
(*colorsP)[N] is that color. So this array is either 256 or 64K
pixels. In this case, we return *ptabP = NULL.
If it is more than 2 characters per pixel, we return the colormap as
both a Netpbm 'pixel' array *colorsP and a lookup table *ptabP (both
in newly malloc'ed storage).
If a color in the raster is identified by index N, then for some I,
(*ptabP)[I] is N and (*colorsP)[I] is the color in question. So
you iterate through *ptabP looking for N and then look at the
corresponding entry in *colorsP to get the color.
Return as *transColorNumberP the value of the XPM color number that
represents a transparent pixel, or -1 if no color number does.
-----------------------------------------------------------------------------*/
char line[MAX_LINE+1];
const char * xpm3_signature = "/* XPM */";
unsigned int colormapSize;
unsigned int width, height;
unsigned int nColors;
unsigned int charsPerPixel;
pixel * colors;
unsigned int * ptab;
/* Read the XPM signature comment */
getline(line, sizeof(line), stream);
if (!strneq(line, xpm3_signature, strlen(xpm3_signature)))
pm_error("Apparent XPM 3 file does not start with '/* XPM */'. "
"First line is '%s'", xpm3_signature);
/* Read the assignment line */
getline(line, sizeof(line), stream);
if (!strneq(line, "static char", 11))
pm_error("Cannot find data structure declaration. Expected a "
"line starting with 'static char', but found the line "
"'%s'.", line);
/* Read the hints line */
getline(line, sizeof(line), stream);
/* skip the comment line if any */
if (strneq(line, "/*", 2)) {
while (!strstr(line, "*/"))
getline(line, sizeof(line), stream);
getline(line, sizeof(line), stream);
}
if (sscanf(line, "\"%u %u %u %u\",", &width, &height,
&nColors, &charsPerPixel) != 4)
pm_error("error scanning hints line");
if (verbose == 1) {
pm_message("Width x Height: %u x %u", width, height);
pm_message("no. of colors: %u", nColors);
pm_message("chars per pixel: %u", charsPerPixel);
}
/* Allocate space for color table. */
if (charsPerPixel <= 2) {
/* Set up direct index (see above) */
colormapSize = charsPerPixel == 1 ? 256 : 256*256;
ptab = NULL;
} else {
/* Set up lookup table (see above) */
colormapSize = nColors;
MALLOCARRAY(ptab, nColors);
if (ptab == NULL)
pm_error("Unable to allocate memory for %u colors", nColors);
}
colors = ppm_allocrow(colormapSize);
{
/* Read the color table */
unsigned int seqNum;
/* Sequence number of entry within color table in XPM header */
*transparentP = -1; /* initial value */
for (seqNum = 0; seqNum < nColors; ++seqNum) {
getline(line, sizeof(line), stream);
/* skip the comment line if any */
if (strneq(line, "/*", 2))
getline(line, sizeof(line), stream);
interpretXpm3ColorTableLine(line, seqNum, charsPerPixel,
colors, ptab, nColors, transparentP);
}
}
*widthP = width;
*heightP = height;
*charsPerPixelP = charsPerPixel;
*nColorsP = nColors;
*colorsP = colors;
*ptabP = ptab;
}
static void
readXpm1Header(FILE * const stream,
int * const widthP,
int * const heightP,
unsigned int * const charsPerPixelP,
int * const ncolorsP,
pixel ** const colorsP,
unsigned int ** const ptabP) {
/*----------------------------------------------------------------------------
Read the header of the XPM file on stream 'stream'. Assume the
getline() stream is presently positioned to the beginning of the
file and it is a Version 1 XPM file. Leave the stream positioned
after the header.
Return the information from the header the same as for readXpm3Header.
-----------------------------------------------------------------------------*/
char line[MAX_LINE+1], str1[MAX_LINE+1], str2[MAX_LINE+1];
char *t1;
char *t2;
int format, v;
int i, j;
bool processedStaticChar;
/* We have read up to and interpreted the "static char..." line */
bool gotPixel;
*widthP = *heightP = *ncolorsP = format = -1;
gotPixel = false;
/* Read the initial defines. */
processedStaticChar = FALSE;
while (!processedStaticChar) {
getline(line, sizeof(line), stream);
if (sscanf(line, "#define %s %d", str1, &v) == 2) {
char *t1;
if ((t1 = strrchr(str1, '_')) == NULL)
t1 = str1;
else
++t1;
if (streq(t1, "format"))
format = v;
else if (streq(t1, "width"))
*widthP = v;
else if (streq(t1, "height"))
*heightP = v;
else if (streq(t1, "ncolors"))
*ncolorsP = v;
else if (streq(t1, "pixel")) {
gotPixel = TRUE;
*charsPerPixelP = v;
}
} else if (strneq(line, "static char", 11)) {
if ((t1 = strrchr(line, '_')) == NULL)
t1 = line;
else
++t1;
processedStaticChar = TRUE;
}
}
/* File is positioned to "static char" line, which is in line[] and
t1 points to position of last "_" in the line, or the beginning of
the line if there is no "_"
*/
if (!gotPixel)
pm_error("No 'pixel' value (characters per pixel)");
if (format == -1)
pm_error("missing or invalid format");
if (format != 1)
pm_error("can't handle XPM version %d", format);
if (*widthP == -1)
pm_error("missing or invalid width");
if (*heightP == -1)
pm_error("missing or invalid height");
if (*ncolorsP == -1)
pm_error("missing or invalid ncolors");
if (*charsPerPixelP > 2)
pm_message("WARNING: > 2 characters per pixel uses a lot of memory");
/* If there's a monochrome color table, skip it. */
if (strneq(t1, "mono", 4)) {
for (;;) {
getline(line, sizeof(line), stream);
if (strneq(line, "static char", 11))
break;
}
}
/* Allocate space for color table. */
if (*charsPerPixelP <= 2) {
/* Up to two chars per pixel, we can use an indexed table. */
v = 1;
for (i = 0; i < *charsPerPixelP; ++i)
v *= 256;
*colorsP = ppm_allocrow(v);
*ptabP = NULL;
} else {
/* Over two chars per pixel, we fall back on linear search. */
*colorsP = ppm_allocrow(*ncolorsP);
MALLOCARRAY(*ptabP, *ncolorsP);
if (*ptabP == NULL)
pm_error("Unable to allocate memory for %d colors", *ncolorsP);
}
/* Read color table. */
for (i = 0; i < *ncolorsP; ++i) {
getline(line, sizeof(line), stream);
if ((t1 = strchr(line, '"')) == NULL)
pm_error("D error scanning color table");
if ((t2 = strchr(t1 + 1, '"')) == NULL)
pm_error("E error scanning color table");
if (t2 - t1 - 1 != *charsPerPixelP)
pm_error("wrong number of chars per pixel in color table");
strncpy(str1, t1 + 1, t2 - t1 - 1);
str1[t2 - t1 - 1] = '\0';
if ((t1 = strchr(t2 + 1, '"')) == NULL)
pm_error("F error scanning color table");
if ((t2 = strchr(t1 + 1, '"')) == NULL)
pm_error("G error scanning color table");
strncpy(str2, t1 + 1, t2 - t1 - 1);
str2[t2 - t1 - 1] = '\0';
v = 0;
for (j = 0; j < *charsPerPixelP; ++j)
v = (v << 8) + str1[j];
if (*charsPerPixelP <= 2)
/* Index into table. */
(*colorsP)[v] = ppm_parsecolor(str2,
(pixval) PPM_MAXMAXVAL);
else {
/* Set up linear search table. */
(*colorsP)[i] = ppm_parsecolor(str2,
(pixval) PPM_MAXMAXVAL);
(*ptabP)[i] = v;
}
}
/* Position to first line of raster (which is the line after
"static char ...").
*/
for (;;) {
getline(line, sizeof(line), stream);
if (strneq(line, "static char", 11))
break;
}
}
static void
interpretXpmLine(char const line[],
unsigned int const charsPerPixel,
int const ncolors,
unsigned int * const ptab,
int ** const cursorP,
int * const maxCursor) {
/*----------------------------------------------------------------------------
Interpret one line of XPM input. The line is in 'line', and its
format is 'charsPerPixel' characters per pixel. 'ptab' is the
color table that applies to the line, which table has 'ncolors'
colors.
Put the colormap indexes for the pixels represented in 'line' at
*cursorP, lined up in the order they are in 'line', and return
*cursorP positioned just after the last one.
If the line doesn't start with a quote (e.g. it is empty), we issue
a warning and just treat the line as one that describes no pixels.
Stop processing the line either at the end of the line or when
the output would go beyond maxCursor, whichever comes first.
-----------------------------------------------------------------------------*/
char * lineCursor;
lineCursor = strchr(line, '"'); /* position to 1st quote in line */
if (lineCursor == NULL) {
/* We've seen a purported XPM that had a blank line in it. Just
ignoring it was the right thing to do. 05.05.27.
*/
pm_message("WARNING: No opening quotation mark in XPM input "
"line which is supposed to be a line of raster data: "
"'%s'. Ignoring this line.", line);
} else {
++lineCursor; /* Skip to first character after quote */
/* Handle pixels until a close quote, eol, or we've returned all
the pixels Caller wants.
*/
while (*lineCursor && *lineCursor != '"' && *cursorP <= maxCursor) {
unsigned int colorNumber;
unsigned int i;
colorNumber = 0; /* initial value */
for (i = 0; i < charsPerPixel; ++i) {
unsigned char const byte = (unsigned char)(*lineCursor++);
colorNumber = (colorNumber << 8) + byte;
}
if (ptab == NULL)
/* colormap is indexed directly by XPM color number */
*(*cursorP)++ = colorNumber;
else {
/* colormap shadows ptab[]. Find this color # in ptab[] */
unsigned int i;
for (i = 0; i < ncolors && ptab[i] != colorNumber; ++i);
if (i < ncolors)
*(*cursorP)++ = i;
else
pm_error("Color number %u is in raster, but not in "
"colormap. Line it's in: '%s'",
colorNumber, line);
}
}
}
}
static void
ReadXPMFile(FILE * const stream, int * const widthP, int * const heightP,
pixel ** const colorsP, int ** const dataP,
int * const transparentP) {
/*----------------------------------------------------------------------------
Read the XPM file from stream 'stream'.
Return the dimensions of the image as *widthP and *heightP.
Return the color map as *colorsP, which is an array of *ncolorsP
colors.
Return the raster in newly malloced storage, an array of *widthP by
*heightP integers, each of which is an index into the colormap
*colorsP (and therefore less than *ncolorsP). Return the address
of the array as *dataP.
In the colormap, put black for the transparent color, if the XPM
image contains one.
-----------------------------------------------------------------------------*/
char line[MAX_LINE+1], str1[MAX_LINE+1];
int totalpixels;
int * cursor; /* cursor into *dataP */
int * maxcursor; /* value of above cursor for last pixel in image */
unsigned int * ptab; /* colormap - malloc'ed */
int rc;
int ncolors;
unsigned int charsPerPixel;
backup = FALSE;
/* Read the header line */
getline(line, sizeof(line), stream);
backup = TRUE; /* back up so next read reads this line again */
rc = sscanf(line, "/* %s */", str1);
if (rc == 1 && strneq(str1, "XPM", 3)) {
/* It's an XPM version 3 file */
readXpm3Header(stream, widthP, heightP, &charsPerPixel,
&ncolors, colorsP, &ptab, transparentP);
} else { /* try as an XPM version 1 file */
/* Assume it's an XPM version 1 file */
readXpm1Header(stream, widthP, heightP, &charsPerPixel,
&ncolors, colorsP, &ptab);
*transparentP = -1; /* No transparency in version 1 */
}
totalpixels = *widthP * *heightP;
MALLOCARRAY(*dataP, totalpixels);
if (*dataP == NULL)
pm_error("Could not get %d bytes of memory for image", totalpixels);
cursor = *dataP;
maxcursor = *dataP + totalpixels - 1;
getline(line, sizeof(line), stream);
/* read next line (first line may not always start with comment) */
while (cursor <= maxcursor) {
if (strneq(line, "/*", 2)) {
/* It's a comment. Ignore it. */
} else {
interpretXpmLine(line, charsPerPixel,
ncolors, ptab, &cursor, maxcursor);
}
if (cursor <= maxcursor)
getline(line, sizeof(line), stream);
}
if (ptab) free(ptab);
}
static void
writeOutput(FILE * const imageout_file,
FILE * const alpha_file,
int const cols, int const rows,
pixel * const colors, int * const data,
int transparent) {
/*----------------------------------------------------------------------------
Write the image in 'data' to open PPM file stream 'imageout_file',
and the alpha mask for it to open PBM file stream 'alpha_file',
except if either is NULL, skip it.
'data' is an array of cols * rows integers, each one being an index
into the colormap 'colors'.
Where the index 'transparent' occurs in 'data', the pixel is supposed
to be transparent. If 'transparent' < 0, no pixels are transparent.
-----------------------------------------------------------------------------*/
int row;
pixel *pixrow;
bit * alpharow;
if (imageout_file)
ppm_writeppminit(imageout_file, cols, rows, PPM_MAXMAXVAL, 0);
if (alpha_file)
pbm_writepbminit(alpha_file, cols, rows, 0);
pixrow = ppm_allocrow(cols);
alpharow = pbm_allocrow(cols);
for (row = 0; row < rows; ++row ) {
int col;
int * const datarow = data+(row*cols);
for (col = 0; col < cols; ++col) {
pixrow[col] = colors[datarow[col]];
if (datarow[col] == transparent)
alpharow[col] = PBM_BLACK;
else
alpharow[col] = PBM_WHITE;
}
if (imageout_file)
ppm_writeppmrow(imageout_file,
pixrow, cols, (pixval) PPM_MAXMAXVAL, 0);
if (alpha_file)
pbm_writepbmrow(alpha_file, alpharow, cols, 0);
}
ppm_freerow(pixrow);
pbm_freerow(alpharow);
if (imageout_file)
pm_close(imageout_file);
if (alpha_file)
pm_close(alpha_file);
}
int
main(int argc, char *argv[]) {
FILE *ifp;
FILE *alpha_file, *imageout_file;
pixel *colormap;
int cols, rows;
int transparent; /* value of 'data' that means transparent */
int *data;
/* The image as an array of width * height integers, each one
being an index int colormap[].
*/
struct cmdlineInfo cmdline;
ppm_init(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
verbose = cmdline.verbose;
if ( cmdline.input_filespec != NULL )
ifp = pm_openr( cmdline.input_filespec);
else
ifp = stdin;
if (cmdline.alpha_stdout)
alpha_file = stdout;
else if (cmdline.alpha_filename == NULL)
alpha_file = NULL;
else {
alpha_file = pm_openw(cmdline.alpha_filename);
}
if (cmdline.alpha_stdout)
imageout_file = NULL;
else
imageout_file = stdout;
ReadXPMFile(ifp, &cols, &rows, &colormap, &data, &transparent);
pm_close(ifp);
writeOutput(imageout_file, alpha_file, cols, rows, colormap, data,
transparent);
free(colormap);
return 0;
}
|