More iolayers work:
[imager.git] / tga.c
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92bda632 1#include "imageri.h"
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2#include "log.h"
3#include "iolayer.h"
4
5#include <stdlib.h>
6#include <errno.h>
7
8
9/*
10=head1 NAME
11
12tga.c - implements reading and writing targa files, uses io layer.
13
14=head1 SYNOPSIS
15
16 io_glue *ig = io_new_fd( fd );
17 i_img *im = i_readtga_wiol(ig, -1); // no limit on how much is read
18 // or
19 io_glue *ig = io_new_fd( fd );
20 return_code = i_writetga_wiol(im, ig);
21
22=head1 DESCRIPTION
23
24tga.c implements the basic functions to read and write portable targa
25files. It uses the iolayer and needs either a seekable source or an
26entire memory mapped buffer.
27
28=head1 FUNCTION REFERENCE
29
30Some of these functions are internal.
31
b8c2033e 32=over
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33
34=cut
35*/
36
37
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38
39
40typedef struct {
b96be931 41 unsigned char idlength;
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42 char colourmaptype;
43 char datatypecode;
44 short int colourmaporigin;
45 short int colourmaplength;
46 char colourmapdepth;
47 short int x_origin;
48 short int y_origin;
49 short width;
50 short height;
51 char bitsperpixel;
52 char imagedescriptor;
53} tga_header;
54
55
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56typedef enum { NoInit, Raw, Rle } rle_state;
57
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58typedef struct {
59 int compressed;
60 int bytepp;
76ff75b8 61 rle_state state;
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62 unsigned char cval[4];
63 int len;
64 unsigned char hdr;
65 io_glue *ig;
66} tga_source;
67
68
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69typedef struct {
70 int compressed;
71 int bytepp;
72 io_glue *ig;
73} tga_dest;
74
75
76
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77/*
78=item bpp_to_bytes(bpp)
79
80Convert bits per pixel into bytes per pixel
81
82 bpp - bits per pixel
83
84=cut
85*/
86
87
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88static
89int
90bpp_to_bytes(unsigned int bpp) {
91 switch (bpp) {
92 case 8:
93 return 1;
94 case 15:
95 case 16:
96 return 2;
97 case 24:
98 return 3;
99 case 32:
100 return 4;
101 }
102 return 0;
103}
104
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105
106
107/*
108=item bpp_to_channels(bpp)
109
110Convert bits per pixel into channels in the image
111
112 bpp - bits per pixel
113
114=cut
115*/
116
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117static
118int
119bpp_to_channels(unsigned int bpp) {
120 switch (bpp) {
121 case 8:
122 return 1;
123 case 15:
124 return 3;
125 case 16:
126 return 4;
127 case 24:
128 return 3;
129 case 32:
130 return 4;
131 }
132 return 0;
133}
134
135
136
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137/*
138 * Packing functions - used for (un)packing
139 * datastructures into raw bytes.
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140 */
141
142
143/*
144=item color_unpack(buf, bytepp, val)
76ff75b8 145
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146Unpacks bytes into colour structures, for 2 byte type the first byte
147coming from the file will actually be GGGBBBBB, and the second will be
148ARRRRRGG. "A" represents an attribute bit. The 3 byte entry contains
1491 byte each of blue, green, and red. The 4 byte entry contains 1 byte
150each of blue, green, red, and attribute.
76ff75b8 151
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152 buf - pointer to data
153 bytepp - bytes per pixel
154 val - pointer to color to store to
920aa4a5 155
febba01f 156=cut
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157*/
158
159static
160void
161color_unpack(unsigned char *buf, int bytepp, i_color *val) {
162 switch (bytepp) {
163 case 1:
164 val->gray.gray_color = buf[0];
165 break;
166 case 2:
167 val->rgba.r = (buf[1] & 0x7c) << 1;
168 val->rgba.g = ((buf[1] & 0x03) << 6) | ((buf[0] & 0xe0) >> 2);
169 val->rgba.b = (buf[0] & 0x1f) << 3;
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170 val->rgba.a = (buf[1] & 0x80) ? 255 : 0;
171 val->rgba.r |= val->rgba.r >> 5;
172 val->rgba.g |= val->rgba.g >> 5;
173 val->rgba.b |= val->rgba.b >> 5;
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174 break;
175 case 3:
176 val->rgb.b = buf[0];
177 val->rgb.g = buf[1];
178 val->rgb.r = buf[2];
179 break;
180 case 4:
181 val->rgba.b = buf[0];
182 val->rgba.g = buf[1];
183 val->rgba.r = buf[2];
184 val->rgba.a = buf[3];
185 break;
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186 }
187}
188
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189
190
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191/*
192=item color_pack
76ff75b8 193
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194Packs a colour into an array of bytes, for 2 byte type the first byte
195will be GGGBBBBB, and the second will be ARRRRRGG. "A" represents an
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196attribute bit. The 3 byte entry contains 1 byte each of blue, green,
197and red. The 4 byte entry contains 1 byte each of blue, green, red,
198and attribute.
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199
200 buf - destination buffer
201 bitspp - bits per pixel
202 val - color to pack
203
204=cut
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205*/
206
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207static
208void
209color_pack(unsigned char *buf, int bitspp, i_color *val) {
210 switch (bitspp) {
211 case 8:
212 buf[0] = val->gray.gray_color;
213 break;
214 case 15:
215 buf[0] = (val->rgba.b >> 3);
216 buf[0] |= (val->rgba.g & 0x38) << 2;
217 buf[1] = (val->rgba.r & 0xf8)>> 1;
218 buf[1] |= (val->rgba.g >> 6);
219 case 16:
220 buf[1] |= val->rgba.a & 0x80;
221 break;
222 case 24:
223 buf[0] = val->rgb.b;
224 buf[1] = val->rgb.g;
225 buf[2] = val->rgb.r;
226 break;
227 case 32:
228 buf[0] = val->rgba.b;
229 buf[1] = val->rgba.g;
230 buf[2] = val->rgba.r;
231 buf[3] = val->rgba.a;
232 break;
76ff75b8 233 }
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234}
235
236
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237/*
238=item find_repeat
239
240Helper function for rle compressor to find the next triple repeat of the
241same pixel value in buffer.
242
243 buf - buffer
244 length - number of pixel values in buffer
245 bytepp - number of bytes in a pixel value
76ff75b8 246
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247=cut
248*/
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249
250static
251int
252find_repeat(unsigned char *buf, int length, int bytepp) {
253 int i = 0;
254
255 while(i<length-1) {
256 if(memcmp(buf+i*bytepp, buf+(i+1)*bytepp, bytepp) == 0) {
257 if (i == length-2) return -1;
258 if (memcmp(buf+(i+1)*bytepp, buf+(i+2)*bytepp,bytepp) == 0)
259 return i;
260 else i++;
261 }
262 i++;
263 }
264 return -1;
265}
266
267
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268/*
269=item find_span
270
271Helper function for rle compressor to find the length of a span where
272the same pixel value is in the buffer.
273
274 buf - buffer
275 length - number of pixel values in buffer
276 bytepp - number of bytes in a pixel value
277
278=cut
279*/
280
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281static
282int
283find_span(unsigned char *buf, int length, int bytepp) {
284 int i = 0;
285 while(i<length) {
286 if(memcmp(buf, buf+(i*bytepp), bytepp) != 0) return i;
287 i++;
288 }
289 return length;
290}
291
292
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293/*
294=item tga_header_unpack(header, headbuf)
295
296Unpacks the header structure into from buffer and stores
297in the header structure.
298
299 header - header structure
300 headbuf - buffer to unpack from
301
302=cut
303*/
304
305static
306void
307tga_header_unpack(tga_header *header, unsigned char headbuf[18]) {
308 header->idlength = headbuf[0];
309 header->colourmaptype = headbuf[1];
310 header->datatypecode = headbuf[2];
311 header->colourmaporigin = (headbuf[4] << 8) + headbuf[3];
312 header->colourmaplength = (headbuf[6] << 8) + headbuf[5];
313 header->colourmapdepth = headbuf[7];
314 header->x_origin = (headbuf[9] << 8) + headbuf[8];
315 header->y_origin = (headbuf[11] << 8) + headbuf[10];
316 header->width = (headbuf[13] << 8) + headbuf[12];
317 header->height = (headbuf[15] << 8) + headbuf[14];
318 header->bitsperpixel = headbuf[16];
319 header->imagedescriptor = headbuf[17];
320}
321
322
63e0dc02 323/* this function should never produce diagnostics to stdout, maybe to the logfile */
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324int
325tga_header_verify(unsigned char headbuf[18]) {
326 tga_header header;
327 tga_header_unpack(&header, headbuf);
328 switch (header.datatypecode) {
329 default:
63e0dc02 330 /*printf("bad typecode!\n");*/
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331 return 0;
332 case 0:
333 case 1: /* Uncompressed, color-mapped images */
334 case 2: /* Uncompressed, rgb images */
335 case 3: /* Uncompressed, grayscale images */
336 case 9: /* Compressed, color-mapped images */
337 case 10: /* Compressed, rgb images */
338 case 11: /* Compressed, grayscale images */
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339 break;
340 }
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341
342 switch (header.colourmaptype) {
343 default:
63e0dc02 344 /*printf("bad colourmaptype!\n");*/
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345 return 0;
346 case 0:
347 case 1:
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348 break;
349 }
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350
351 return 1;
352}
353
354
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355/*
356=item tga_header_pack(header, headbuf)
357
358Packs header structure into buffer for writing.
76ff75b8 359
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360 header - header structure
361 headbuf - buffer to pack into
76ff75b8 362
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363=cut
364*/
365
366static
367void
368tga_header_pack(tga_header *header, unsigned char headbuf[18]) {
369 headbuf[0] = header->idlength;
370 headbuf[1] = header->colourmaptype;
371 headbuf[2] = header->datatypecode;
372 headbuf[3] = header->colourmaporigin & 0xff;
373 headbuf[4] = header->colourmaporigin >> 8;
374 headbuf[5] = header->colourmaplength & 0xff;
375 headbuf[6] = header->colourmaplength >> 8;
376 headbuf[7] = header->colourmapdepth;
377 headbuf[8] = header->x_origin & 0xff;
378 headbuf[9] = header->x_origin >> 8;
379 headbuf[10] = header->y_origin & 0xff;
380 headbuf[11] = header->y_origin >> 8;
381 headbuf[12] = header->width & 0xff;
382 headbuf[13] = header->width >> 8;
383 headbuf[14] = header->height & 0xff;
384 headbuf[15] = header->height >> 8;
385 headbuf[16] = header->bitsperpixel;
386 headbuf[17] = header->imagedescriptor;
387}
388
389
390/*
391=item tga_source_read(s, buf, pixels)
392
393Reads pixel number of pixels from source s into buffer buf. Takes
394care of decompressing the stream if needed.
395
396 s - data source
397 buf - destination buffer
398 pixels - number of pixels to put into buffer
399
400=cut
401*/
76ff75b8 402
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403static
404int
405tga_source_read(tga_source *s, unsigned char *buf, size_t pixels) {
406 int cp = 0, j, k;
407 if (!s->compressed) {
408 if (s->ig->readcb(s->ig, buf, pixels*s->bytepp) != pixels*s->bytepp) return 0;
409 return 1;
410 }
411
412 while(cp < pixels) {
413 int ml;
414 if (s->len == 0) s->state = NoInit;
415 switch (s->state) {
416 case NoInit:
417 if (s->ig->readcb(s->ig, &s->hdr, 1) != 1) return 0;
418
419 s->len = (s->hdr &~(1<<7))+1;
420 s->state = (s->hdr & (1<<7)) ? Rle : Raw;
9a88a5e6 421 {
84e51293 422/*
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423 static cnt = 0;
424 printf("%04d %s: %d\n", cnt++, s->state==Rle?"RLE":"RAW", s->len);
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425 */
426 }
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427 if (s->state == Rle && s->ig->readcb(s->ig, s->cval, s->bytepp) != s->bytepp) return 0;
428
429 break;
430 case Rle:
b33c08f8 431 ml = i_min(s->len, pixels-cp);
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432 for(k=0; k<ml; k++) for(j=0; j<s->bytepp; j++)
433 buf[(cp+k)*s->bytepp+j] = s->cval[j];
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434 cp += ml;
435 s->len -= ml;
436 break;
437 case Raw:
b33c08f8 438 ml = i_min(s->len, pixels-cp);
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439 if (s->ig->readcb(s->ig, buf+cp*s->bytepp, ml*s->bytepp) != ml*s->bytepp) return 0;
440 cp += ml;
441 s->len -= ml;
442 break;
443 }
444 }
445 return 1;
446}
447
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448
449
76ff75b8 450
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451/*
452=item tga_dest_write(s, buf, pixels)
453
454Writes pixels from buf to destination s. Takes care of compressing if the
455destination is compressed.
456
457 s - data destination
458 buf - source buffer
459 pixels - number of pixels to put write to destination
460
461=cut
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462*/
463
464static
465int
466tga_dest_write(tga_dest *s, unsigned char *buf, size_t pixels) {
63e0dc02 467 int cp = 0;
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468
469 if (!s->compressed) {
470 if (s->ig->writecb(s->ig, buf, pixels*s->bytepp) != pixels*s->bytepp) return 0;
471 return 1;
472 }
473
474 while(cp < pixels) {
475 int tlen;
476 int nxtrip = find_repeat(buf+cp*s->bytepp, pixels-cp, s->bytepp);
477 tlen = (nxtrip == -1) ? pixels-cp : nxtrip;
478 while(tlen) {
9a88a5e6 479 unsigned char clen = (tlen>128) ? 128 : tlen;
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480 clen--;
481 if (s->ig->writecb(s->ig, &clen, 1) != 1) return 0;
482 clen++;
483 if (s->ig->writecb(s->ig, buf+cp*s->bytepp, clen*s->bytepp) != clen*s->bytepp) return 0;
484 tlen -= clen;
485 cp += clen;
486 }
487 if (cp >= pixels) break;
488 tlen = find_span(buf+cp*s->bytepp, pixels-cp, s->bytepp);
07d70837 489 if (tlen <3) continue;
76ff75b8 490 while (tlen) {
9a88a5e6 491 unsigned char clen = (tlen>128) ? 128 : tlen;
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492 clen = (clen - 1) | 0x80;
493 if (s->ig->writecb(s->ig, &clen, 1) != 1) return 0;
494 clen = (clen & ~0x80) + 1;
495 if (s->ig->writecb(s->ig, buf+cp*s->bytepp, s->bytepp) != s->bytepp) return 0;
496 tlen -= clen;
497 cp += clen;
498 }
499 }
500 return 1;
501}
502
503
504
505
506
507
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508/*
509=item tga_palette_read(ig, img, bytepp, colourmaplength)
510
511Reads the colormap from a tga file and stores in the paletted image
512structure.
76ff75b8 513
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514 ig - iolayer data source
515 img - image structure
516 bytepp - bytes per pixel
517 colourmaplength - number of colours in colourmap
518
519=cut
520*/
76ff75b8 521
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522static
523int
524tga_palette_read(io_glue *ig, i_img *img, int bytepp, int colourmaplength) {
525 int i;
526 size_t palbsize;
527 unsigned char *palbuf;
528 i_color val;
529
530 palbsize = colourmaplength*bytepp;
531 palbuf = mymalloc(palbsize);
532
533 if (ig->readcb(ig, palbuf, palbsize) != palbsize) {
534 i_push_error(errno, "could not read targa colourmap");
535 return 0;
536 }
537
538 /* populate the palette of the new image */
539 for(i=0; i<colourmaplength; i++) {
540 color_unpack(palbuf+i*bytepp, bytepp, &val);
541 i_addcolors(img, &val, 1);
542 }
543 myfree(palbuf);
544 return 1;
545}
546
547
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548/*
549=item tga_palette_write(ig, img, bitspp, colourmaplength)
550
551Stores the colormap of an image in the destination ig.
552
553 ig - iolayer data source
554 img - image structure
555 bitspp - bits per pixel in colourmap
556 colourmaplength - number of colours in colourmap
557
558=cut
559*/
920aa4a5 560
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561static
562int
563tga_palette_write(io_glue *ig, i_img *img, int bitspp, int colourmaplength) {
564 int i;
565 int bytepp = bpp_to_bytes(bitspp);
566 size_t palbsize = i_colorcount(img)*bytepp;
567 unsigned char *palbuf = mymalloc(palbsize);
568
569 for(i=0; i<colourmaplength; i++) {
570 i_color val;
571 i_getcolors(img, i, &val, 1);
572 color_pack(palbuf+i*bytepp, bitspp, &val);
573 }
574
575 if (ig->writecb(ig, palbuf, palbsize) != palbsize) {
576 i_push_error(errno, "could not write targa colourmap");
577 return 0;
578 }
579 myfree(palbuf);
580 return 1;
581}
582
920aa4a5 583
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584
585/*
586=item i_readtga_wiol(ig, length)
587
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588Read in an image from the iolayer data source and return the image structure to it.
589Returns NULL on error.
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590
591 ig - io_glue object
592 length - maximum length to read from data source, before closing it -1
593 signifies no limit.
594
595=cut
596*/
597
598i_img *
599i_readtga_wiol(io_glue *ig, int length) {
07d70837 600 i_img* img = NULL;
a659442a 601 int x, y;
1ec86afa 602 int width, height, channels;
920aa4a5 603 int mapped;
07d70837 604 char *idstring = NULL;
1ec86afa 605
920aa4a5 606 tga_source src;
1ec86afa 607 tga_header header;
1ec86afa 608 unsigned char headbuf[18];
7c58edfc 609 unsigned char *databuf;
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610
611 i_color *linebuf = NULL;
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612 i_clear_error();
613
614 mm_log((1,"i_readtga(ig %p, length %d)\n", ig, length));
615
616 io_glue_commit_types(ig);
617
618 if (ig->readcb(ig, &headbuf, 18) != 18) {
619 i_push_error(errno, "could not read targa header");
620 return NULL;
621 }
622
76ff75b8 623 tga_header_unpack(&header, headbuf);
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624
625 mm_log((1,"Id length: %d\n",header.idlength));
626 mm_log((1,"Colour map type: %d\n",header.colourmaptype));
627 mm_log((1,"Image type: %d\n",header.datatypecode));
628 mm_log((1,"Colour map offset: %d\n",header.colourmaporigin));
629 mm_log((1,"Colour map length: %d\n",header.colourmaplength));
630 mm_log((1,"Colour map depth: %d\n",header.colourmapdepth));
631 mm_log((1,"X origin: %d\n",header.x_origin));
632 mm_log((1,"Y origin: %d\n",header.y_origin));
633 mm_log((1,"Width: %d\n",header.width));
634 mm_log((1,"Height: %d\n",header.height));
635 mm_log((1,"Bits per pixel: %d\n",header.bitsperpixel));
636 mm_log((1,"Descriptor: %d\n",header.imagedescriptor));
637
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638 if (header.idlength) {
639 idstring = mymalloc(header.idlength+1);
640 if (ig->readcb(ig, idstring, header.idlength) != header.idlength) {
641 i_push_error(errno, "short read on targa idstring");
642 return NULL;
643 }
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644 }
645
646 width = header.width;
647 height = header.height;
77157728 648
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649
650 /* Set tags here */
920aa4a5 651
1ec86afa 652 switch (header.datatypecode) {
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653 case 0: /* No data in image */
654 i_push_error(0, "Targa image contains no image data");
07d70837 655 if (idstring) myfree(idstring);
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656 return NULL;
657 break;
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658 case 1: /* Uncompressed, color-mapped images */
659 case 9: /* Compressed, color-mapped images */
660 case 3: /* Uncompressed, grayscale images */
661 case 11: /* Compressed, grayscale images */
1ec86afa 662 if (header.bitsperpixel != 8) {
920aa4a5 663 i_push_error(0, "Targa: mapped/grayscale image's bpp is not 8, unsupported.");
07d70837 664 if (idstring) myfree(idstring);
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665 return NULL;
666 }
920aa4a5 667 src.bytepp = 1;
1ec86afa 668 break;
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669 case 2: /* Uncompressed, rgb images */
670 case 10: /* Compressed, rgb images */
671 if ((src.bytepp = bpp_to_bytes(header.bitsperpixel)))
672 break;
673 i_push_error(0, "Targa: direct color image's bpp is not 15/16/24/32 - unsupported.");
07d70837 674 if (idstring) myfree(idstring);
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675 return NULL;
676 break;
677 case 32: /* Compressed color-mapped, Huffman, Delta and runlength */
1ec86afa 678 case 33: /* Compressed color-mapped, Huffman, Delta and runlength */
920aa4a5 679 i_push_error(0, "Unsupported Targa (Huffman/delta/rle/quadtree) subformat is not supported");
07d70837 680 if (idstring) myfree(idstring);
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681 return NULL;
682 break;
683 default: /* All others which we don't know which might be */
684 i_push_error(0, "Unknown targa format");
07d70837 685 if (idstring) myfree(idstring);
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686 return NULL;
687 break;
688 }
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689
690 src.state = NoInit;
691 src.len = 0;
692 src.ig = ig;
693 src.compressed = !!(header.datatypecode & (1<<3));
694
695 /* Determine number of channels */
696
697 mapped = 1;
698 switch (header.datatypecode) {
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699 case 2: /* Uncompressed, rgb images */
700 case 10: /* Compressed, rgb images */
701 mapped = 0;
702 case 1: /* Uncompressed, color-mapped images */
703 case 9: /* Compressed, color-mapped images */
704 if ((channels = bpp_to_channels(mapped ?
705 header.colourmapdepth :
706 header.bitsperpixel))) break;
707 i_push_error(0, "Targa Image has none of 15/16/24/32 pixel layout");
07d70837 708 if (idstring) myfree(idstring);
920aa4a5
AMH
709 return NULL;
710 break;
711 case 3: /* Uncompressed, grayscale images */
712 case 11: /* Compressed, grayscale images */
713 mapped = 0;
714 channels = 1;
715 break;
716 }
77157728
TC
717
718 if (!i_int_check_image_file_limits(width, height, channels,
719 sizeof(i_sample_t))) {
720 mm_log((1, "i_readtga_wiol: image size exceeds limits\n"));
721 return NULL;
722 }
920aa4a5
AMH
723
724 img = mapped ?
725 i_img_pal_new(width, height, channels, 256) :
726 i_img_empty_ch(NULL, width, height, channels);
fe055ff6
TC
727
728 if (!img) {
729 if (idstring)
730 myfree(idstring);
731 return NULL;
732 }
920aa4a5 733
07d70837
AMH
734 if (idstring) {
735 i_tags_add(&img->tags, "tga_idstring", 0, idstring, header.idlength, 0);
4dfa5522 736 myfree(idstring);
07d70837
AMH
737 }
738
920aa4a5
AMH
739 if (mapped &&
740 !tga_palette_read(ig,
741 img,
742 bpp_to_bytes(header.colourmapdepth),
743 header.colourmaplength)
744 ) {
745 i_push_error(0, "Targa Image has none of 15/16/24/32 pixel layout");
07d70837
AMH
746 if (idstring) myfree(idstring);
747 if (img) i_img_destroy(img);
920aa4a5
AMH
748 return NULL;
749 }
750
751 /* Allocate buffers */
752 databuf = mymalloc(width*src.bytepp);
753 if (!mapped) linebuf = mymalloc(width*sizeof(i_color));
754
755 for(y=0; y<height; y++) {
756 if (!tga_source_read(&src, databuf, width)) {
757 i_push_error(errno, "read for targa data failed");
758 myfree(databuf);
07d70837 759 if (img) i_img_destroy(img);
920aa4a5
AMH
760 return NULL;
761 }
7456c26c 762 if (mapped && header.colourmaporigin) for(x=0; x<width; x++) databuf[x] -= header.colourmaporigin;
920aa4a5
AMH
763 if (mapped) i_ppal(img, 0, width, header.imagedescriptor & (1<<5) ? y : height-1-y, databuf);
764 else {
765 for(x=0; x<width; x++) color_unpack(databuf+x*src.bytepp, src.bytepp, linebuf+x);
766 i_plin(img, 0, width, header.imagedescriptor & (1<<5) ? y : height-1-y, linebuf);
767 }
768 }
769 myfree(databuf);
770 if (linebuf) myfree(linebuf);
07d70837 771
fe055ff6 772 i_tags_add(&img->tags, "i_format", 0, "tga", -1, 0);
07d70837
AMH
773 i_tags_addn(&img->tags, "tga_bitspp", 0, mapped?header.colourmapdepth:header.bitsperpixel);
774 if (src.compressed) i_tags_addn(&img->tags, "compressed", 0, 1);
920aa4a5 775 return img;
1ec86afa
AMH
776}
777
778
779
febba01f
AMH
780/*
781=item i_writetga_wiol(img, ig)
1ec86afa 782
febba01f 783Writes an image in targa format. Returns 0 on error.
1ec86afa 784
febba01f
AMH
785 img - image to store
786 ig - io_glue object
1ec86afa 787
febba01f
AMH
788=cut
789*/
1ec86afa
AMH
790
791undef_int
febba01f 792i_writetga_wiol(i_img *img, io_glue *ig, int wierdpack, int compress, char *idstring, size_t idlen) {
7456c26c 793 tga_header header;
76ff75b8 794 tga_dest dest;
7456c26c 795 unsigned char headbuf[18];
76ff75b8
AMH
796 unsigned int bitspp;
797
76ff75b8 798 int mapped;
1ec86afa 799
76ff75b8 800 /* parameters */
febba01f
AMH
801
802 /*
803 int compress = 1;
804 char *idstring = "testing";
805 int wierdpack = 0;
806 */
1ec86afa 807
76ff75b8
AMH
808 idlen = strlen(idstring);
809 mapped = img->type == i_palette_type;
1ec86afa 810
febba01f
AMH
811 mm_log((1,"i_writetga_wiol(img %p, ig %p, idstring %p, idlen %d, wierdpack %d, compress %d)\n",
812 img, ig, idstring, idlen, wierdpack, compress));
7456c26c
AMH
813 mm_log((1, "virtual %d, paletted %d\n", img->virtual, mapped));
814 mm_log((1, "channels %d\n", img->channels));
76ff75b8
AMH
815
816 i_clear_error();
817
818 switch (img->channels) {
819 case 1:
820 bitspp = 8;
821 if (wierdpack) {
822 mm_log((1,"wierdpack option ignored for 1 channel images\n"));
823 wierdpack=0;
824 }
825 break;
826 case 2:
827 i_push_error(0, "Cannot store 2 channel image in targa format");
828 return 0;
829 break;
830 case 3:
831 bitspp = wierdpack ? 15 : 24;
832 break;
833 case 4:
834 bitspp = wierdpack ? 16 : 32;
835 break;
836 default:
837 i_push_error(0, "Targa only handles 1,3 and 4 channel images.");
838 return 0;
839 }
7456c26c 840
76ff75b8
AMH
841 io_glue_commit_types(ig);
842
7456c26c
AMH
843 header.idlength = idlen;
844 header.colourmaptype = mapped ? 1 : 0;
845 header.datatypecode = mapped ? 1 : img->channels == 1 ? 3 : 2;
7456c26c 846 header.datatypecode += compress ? 8 : 0;
76ff75b8 847 mm_log((1, "datatypecode %d\n", header.datatypecode));
7456c26c
AMH
848 header.colourmaporigin = 0;
849 header.colourmaplength = mapped ? i_colorcount(img) : 0;
76ff75b8 850 header.colourmapdepth = mapped ? bitspp : 0;
7456c26c
AMH
851 header.x_origin = 0;
852 header.y_origin = 0;
853 header.width = img->xsize;
854 header.height = img->ysize;
76ff75b8 855 header.bitsperpixel = mapped ? 8 : bitspp;
7456c26c
AMH
856 header.imagedescriptor = (1<<5); /* normal order instead of upside down */
857
76ff75b8 858 tga_header_pack(&header, headbuf);
7456c26c
AMH
859
860 if (ig->writecb(ig, &headbuf, sizeof(headbuf)) != sizeof(headbuf)) {
861 i_push_error(errno, "could not write targa header");
862 return 0;
7c58edfc
AMH
863 }
864
7456c26c
AMH
865 if (idlen) {
866 if (ig->writecb(ig, idstring, idlen) != idlen) {
867 i_push_error(errno, "could not write targa idstring");
868 return 0;
1ec86afa
AMH
869 }
870 }
7456c26c 871
76ff75b8
AMH
872 /* Make this into a constructor? */
873 dest.compressed = compress;
874 dest.bytepp = mapped ? 1 : bpp_to_bytes(bitspp);
875 dest.ig = ig;
c95846c2 876
76ff75b8
AMH
877 mm_log((1, "dest.compressed = %d\n", dest.compressed));
878 mm_log((1, "dest.bytepp = %d\n", dest.bytepp));
c95846c2 879
76ff75b8 880 if (img->type == i_palette_type) {
76ff75b8
AMH
881 if (!tga_palette_write(ig, img, bitspp, i_colorcount(img))) return 0;
882
883 if (!img->virtual && !dest.compressed) {
7456c26c
AMH
884 if (ig->writecb(ig, img->idata, img->bytes) != img->bytes) {
885 i_push_error(errno, "could not write targa image data");
886 return 0;
1ec86afa 887 }
7456c26c
AMH
888 } else {
889 int y;
890 i_palidx *vals = mymalloc(sizeof(i_palidx)*img->xsize);
891 for(y=0; y<img->ysize; y++) {
892 i_gpal(img, 0, img->xsize, y, vals);
76ff75b8 893 tga_dest_write(&dest, vals, img->xsize);
1ec86afa 894 }
7456c26c 895 myfree(vals);
1ec86afa 896 }
76ff75b8
AMH
897 } else { /* direct type */
898 int x, y;
899 int bytepp = wierdpack ? 2 : bpp_to_bytes(bitspp);
900 int lsize = bytepp * img->xsize;
901 i_color *vals = mymalloc(img->xsize*sizeof(i_color));
902 unsigned char *buf = mymalloc(lsize);
903
7456c26c 904 for(y=0; y<img->ysize; y++) {
76ff75b8
AMH
905 i_glin(img, 0, img->xsize, y, vals);
906 for(x=0; x<img->xsize; x++) color_pack(buf+x*bytepp, bitspp, vals+x);
907 tga_dest_write(&dest, buf, img->xsize);
1ec86afa 908 }
76ff75b8
AMH
909 myfree(buf);
910 myfree(vals);
1ec86afa 911 }
10461f9a
TC
912
913 ig->closecb(ig);
914
7456c26c 915 return 1;
1ec86afa 916}
b8c2033e
AMH
917
918/*
919=back
920
921=head1 AUTHOR
922
923Arnar M. Hrafnkelsson <addi@umich.edu>
924
925=head1 SEE ALSO
926
927Imager(3)
928
929=cut
930*/