Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 952 lines (768 sloc) 22.534 kb
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951
#include "imageri.h"
#include "log.h"
#include "iolayer.h"

#include <stdlib.h>
#include <errno.h>


/*
=head1 NAME

tga.c - implements reading and writing targa files, uses io layer.

=head1 SYNOPSIS

io_glue *ig = io_new_fd( fd );
i_img *im = i_readtga_wiol(ig, -1); // no limit on how much is read
// or
io_glue *ig = io_new_fd( fd );
return_code = i_writetga_wiol(im, ig);

=head1 DESCRIPTION

tga.c implements the basic functions to read and write portable targa
files. It uses the iolayer and needs either a seekable source or an
entire memory mapped buffer.

=head1 FUNCTION REFERENCE

Some of these functions are internal.

=over

=cut
*/




typedef struct {
  unsigned char idlength;
  char colourmaptype;
  char datatypecode;
  short int colourmaporigin;
  short int colourmaplength;
  char colourmapdepth;
  short int x_origin;
  short int y_origin;
  short width;
  short height;
  char bitsperpixel;
  char imagedescriptor;
} tga_header;


typedef enum { NoInit, Raw, Rle } rle_state;

typedef struct {
  int compressed;
  int bytepp;
  rle_state state;
  unsigned char cval[4];
  int len;
  unsigned char hdr;
  io_glue *ig;
} tga_source;


typedef struct {
  int compressed;
  int bytepp;
  io_glue *ig;
} tga_dest;



/*
=item bpp_to_bytes(bpp)

Convert bits per pixel into bytes per pixel

bpp - bits per pixel

=cut
*/


static
int
bpp_to_bytes(unsigned int bpp) {
  switch (bpp) {
  case 8:
    return 1;
  case 15:
  case 16:
    return 2;
  case 24:
    return 3;
  case 32:
    return 4;
  }
  return 0;
}



/*
=item bpp_to_channels(bpp)

Convert bits per pixel into channels in the image

bpp - bits per pixel

=cut
*/

static
int
bpp_to_channels(unsigned int bpp) {
  switch (bpp) {
  case 8:
    return 1;
  case 15:
    return 3;
  case 16:
    return 4;
  case 24:
    return 3;
  case 32:
    return 4;
  }
  return 0;
}



/*
* Packing functions - used for (un)packing
* datastructures into raw bytes.
*/


/*
=item color_unpack(buf, bytepp, val)

Unpacks bytes into colour structures, for 2 byte type the first byte
coming from the file will actually be GGGBBBBB, and the second will be
ARRRRRGG. "A" represents an attribute bit. The 3 byte entry contains
1 byte each of blue, green, and red. The 4 byte entry contains 1 byte
each of blue, green, red, and attribute.

buf - pointer to data
bytepp - bytes per pixel
val - pointer to color to store to

=cut
*/

static
void
color_unpack(unsigned char *buf, int bytepp, i_color *val) {
  switch (bytepp) {
  case 1:
    val->gray.gray_color = buf[0];
    break;
  case 2:
    val->rgba.r = (buf[1] & 0x7c) << 1;
    val->rgba.g = ((buf[1] & 0x03) << 6) | ((buf[0] & 0xe0) >> 2);
    val->rgba.b = (buf[0] & 0x1f) << 3;
    val->rgba.a = (buf[1] & 0x80) ? 255 : 0;
    val->rgba.r |= val->rgba.r >> 5;
    val->rgba.g |= val->rgba.g >> 5;
    val->rgba.b |= val->rgba.b >> 5;
    break;
  case 3:
    val->rgb.b = buf[0];
    val->rgb.g = buf[1];
    val->rgb.r = buf[2];
    break;
  case 4:
    val->rgba.b = buf[0];
    val->rgba.g = buf[1];
    val->rgba.r = buf[2];
    val->rgba.a = buf[3];
    break;
  }
}



/*
=item color_pack

Packs a colour into an array of bytes, for 2 byte type the first byte
will be GGGBBBBB, and the second will be ARRRRRGG. "A" represents an
attribute bit. The 3 byte entry contains 1 byte each of blue, green,
and red. The 4 byte entry contains 1 byte each of blue, green, red,
and attribute.

buf - destination buffer
bitspp - bits per pixel
val - color to pack

=cut
*/

static
void
color_pack(unsigned char *buf, int bitspp, i_color *val) {
  switch (bitspp) {
  case 8:
    buf[0] = val->gray.gray_color;
    break;
  case 15:
    buf[0] = (val->rgba.b >> 3);
    buf[0] |= (val->rgba.g & 0x38) << 2;
    buf[1] = (val->rgba.r & 0xf8)>> 1;
    buf[1] |= (val->rgba.g >> 6);
  case 16:
    buf[1] |= val->rgba.a & 0x80;
    break;
  case 24:
    buf[0] = val->rgb.b;
    buf[1] = val->rgb.g;
    buf[2] = val->rgb.r;
    break;
  case 32:
    buf[0] = val->rgba.b;
    buf[1] = val->rgba.g;
    buf[2] = val->rgba.r;
    buf[3] = val->rgba.a;
    break;
  }
}


/*
=item find_repeat

Helper function for rle compressor to find the next triple repeat of the
same pixel value in buffer.

buf - buffer
length - number of pixel values in buffer
bytepp - number of bytes in a pixel value

=cut
*/

static
int
find_repeat(unsigned char *buf, int length, int bytepp) {
  int i = 0;
  
  while(i<length-1) {
    if(memcmp(buf+i*bytepp, buf+(i+1)*bytepp, bytepp) == 0) {
      if (i == length-2) return -1;
      if (memcmp(buf+(i+1)*bytepp, buf+(i+2)*bytepp,bytepp) == 0)
return i;
      else i++;
    }
    i++;
  }
  return -1;
}


/*
=item find_span

Helper function for rle compressor to find the length of a span where
the same pixel value is in the buffer.

buf - buffer
length - number of pixel values in buffer
bytepp - number of bytes in a pixel value

=cut
*/

static
int
find_span(unsigned char *buf, int length, int bytepp) {
  int i = 0;
  while(i<length) {
    if(memcmp(buf, buf+(i*bytepp), bytepp) != 0) return i;
    i++;
  }
  return length;
}


/*
=item tga_header_unpack(header, headbuf)

Unpacks the header structure into from buffer and stores
in the header structure.

header - header structure
headbuf - buffer to unpack from

=cut
*/

static
void
tga_header_unpack(tga_header *header, unsigned char headbuf[18]) {
  header->idlength = headbuf[0];
  header->colourmaptype = headbuf[1];
  header->datatypecode = headbuf[2];
  header->colourmaporigin = (headbuf[4] << 8) + headbuf[3];
  header->colourmaplength = (headbuf[6] << 8) + headbuf[5];
  header->colourmapdepth = headbuf[7];
  header->x_origin = (headbuf[9] << 8) + headbuf[8];
  header->y_origin = (headbuf[11] << 8) + headbuf[10];
  header->width = (headbuf[13] << 8) + headbuf[12];
  header->height = (headbuf[15] << 8) + headbuf[14];
  header->bitsperpixel = headbuf[16];
  header->imagedescriptor = headbuf[17];
}


/* this function should never produce diagnostics to stdout, maybe to the logfile */
int
tga_header_verify(unsigned char headbuf[18]) {
  tga_header header;
  tga_header_unpack(&header, headbuf);
  switch (header.datatypecode) {
  default:
    /*printf("bad typecode!\n");*/
    return 0;
  case 1: /* Uncompressed, color-mapped images */
  case 3: /* Uncompressed, grayscale images */
  case 9: /* Compressed, color-mapped images */
  case 11: /* Compressed, grayscale images */
    if (header.bitsperpixel != 8)
      return 0;
    break;
  case 0:
  case 2: /* Uncompressed, rgb images */
  case 10: /* Compressed, rgb images */
    if (header.bitsperpixel != 15 && header.bitsperpixel != 16
&& header.bitsperpixel != 24 && header.bitsperpixel != 23)
      return 0;
    break;
}

  switch (header.colourmaptype) {
  default:
    /*printf("bad colourmaptype!\n");*/
    return 0;
  case 1:
    if (header.datatypecode != 1 && header.datatypecode != 9)
      return 0; /* only get a color map on a color mapped image */
  case 0:
   break;
}

  switch (header.colourmapdepth) {
  default:
    return 0;
  case 0: /* can be 0 if no colour map */
  case 15:
  case 16:
  case 24:
  case 32:
    break;
  }
  
  return 1;
}


/*
=item tga_header_pack(header, headbuf)

Packs header structure into buffer for writing.

header - header structure
headbuf - buffer to pack into

=cut
*/

static
void
tga_header_pack(tga_header *header, unsigned char headbuf[18]) {
  headbuf[0] = header->idlength;
  headbuf[1] = header->colourmaptype;
  headbuf[2] = header->datatypecode;
  headbuf[3] = header->colourmaporigin & 0xff;
  headbuf[4] = header->colourmaporigin >> 8;
  headbuf[5] = header->colourmaplength & 0xff;
  headbuf[6] = header->colourmaplength >> 8;
  headbuf[7] = header->colourmapdepth;
  headbuf[8] = header->x_origin & 0xff;
  headbuf[9] = header->x_origin >> 8;
  headbuf[10] = header->y_origin & 0xff;
  headbuf[11] = header->y_origin >> 8;
  headbuf[12] = header->width & 0xff;
  headbuf[13] = header->width >> 8;
  headbuf[14] = header->height & 0xff;
  headbuf[15] = header->height >> 8;
  headbuf[16] = header->bitsperpixel;
  headbuf[17] = header->imagedescriptor;
}


/*
=item tga_source_read(s, buf, pixels)

Reads pixel number of pixels from source s into buffer buf. Takes
care of decompressing the stream if needed.

s - data source
buf - destination buffer
pixels - number of pixels to put into buffer

=cut
*/

static
int
tga_source_read(tga_source *s, unsigned char *buf, size_t pixels) {
  int cp = 0, j, k;
  if (!s->compressed) {
    if (s->ig->readcb(s->ig, buf, pixels*s->bytepp) != pixels*s->bytepp) return 0;
    return 1;
  }
  
  while(cp < pixels) {
    int ml;
    if (s->len == 0) s->state = NoInit;
    switch (s->state) {
    case NoInit:
      if (s->ig->readcb(s->ig, &s->hdr, 1) != 1) return 0;

      s->len = (s->hdr &~(1<<7))+1;
      s->state = (s->hdr & (1<<7)) ? Rle : Raw;
      {
/*
static cnt = 0;
printf("%04d %s: %d\n", cnt++, s->state==Rle?"RLE":"RAW", s->len);
*/
     }
      if (s->state == Rle && s->ig->readcb(s->ig, s->cval, s->bytepp) != s->bytepp) return 0;

      break;
    case Rle:
      ml = i_min(s->len, pixels-cp);
      for(k=0; k<ml; k++) for(j=0; j<s->bytepp; j++)
buf[(cp+k)*s->bytepp+j] = s->cval[j];
      cp += ml;
      s->len -= ml;
      break;
    case Raw:
      ml = i_min(s->len, pixels-cp);
      if (s->ig->readcb(s->ig, buf+cp*s->bytepp, ml*s->bytepp) != ml*s->bytepp) return 0;
      cp += ml;
      s->len -= ml;
      break;
    }
  }
  return 1;
}




/*
=item tga_dest_write(s, buf, pixels)

Writes pixels from buf to destination s. Takes care of compressing if the
destination is compressed.

s - data destination
buf - source buffer
pixels - number of pixels to put write to destination

=cut
*/

static
int
tga_dest_write(tga_dest *s, unsigned char *buf, size_t pixels) {
  int cp = 0;

  if (!s->compressed) {
    if (s->ig->writecb(s->ig, buf, pixels*s->bytepp) != pixels*s->bytepp) return 0;
    return 1;
  }
  
  while(cp < pixels) {
    int tlen;
    int nxtrip = find_repeat(buf+cp*s->bytepp, pixels-cp, s->bytepp);
    tlen = (nxtrip == -1) ? pixels-cp : nxtrip;
    while(tlen) {
      unsigned char clen = (tlen>128) ? 128 : tlen;
      clen--;
      if (s->ig->writecb(s->ig, &clen, 1) != 1) return 0;
      clen++;
      if (s->ig->writecb(s->ig, buf+cp*s->bytepp, clen*s->bytepp) != clen*s->bytepp) return 0;
      tlen -= clen;
      cp += clen;
    }
    if (cp >= pixels) break;
    tlen = find_span(buf+cp*s->bytepp, pixels-cp, s->bytepp);
    if (tlen <3) continue;
    while (tlen) {
      unsigned char clen = (tlen>128) ? 128 : tlen;
      clen = (clen - 1) | 0x80;
      if (s->ig->writecb(s->ig, &clen, 1) != 1) return 0;
      clen = (clen & ~0x80) + 1;
      if (s->ig->writecb(s->ig, buf+cp*s->bytepp, s->bytepp) != s->bytepp) return 0;
      tlen -= clen;
      cp += clen;
    }
  }
  return 1;
}






/*
=item tga_palette_read(ig, img, bytepp, colourmaplength)

Reads the colormap from a tga file and stores in the paletted image
structure.

ig - iolayer data source
img - image structure
bytepp - bytes per pixel
colourmaplength - number of colours in colourmap

=cut
*/

static
int
tga_palette_read(io_glue *ig, i_img *img, int bytepp, int colourmaplength) {
  int i;
  size_t palbsize;
  unsigned char *palbuf;
  i_color val;

  palbsize = colourmaplength*bytepp;
  palbuf = mymalloc(palbsize);
  
  if (ig->readcb(ig, palbuf, palbsize) != palbsize) {
    i_push_error(errno, "could not read targa colourmap");
    return 0;
  }
  
  /* populate the palette of the new image */
  for(i=0; i<colourmaplength; i++) {
    color_unpack(palbuf+i*bytepp, bytepp, &val);
    i_addcolors(img, &val, 1);
  }
  myfree(palbuf);
  return 1;
}


/*
=item tga_palette_write(ig, img, bitspp, colourmaplength)

Stores the colormap of an image in the destination ig.

ig - iolayer data source
img - image structure
bitspp - bits per pixel in colourmap
colourmaplength - number of colours in colourmap

=cut
*/

static
int
tga_palette_write(io_glue *ig, i_img *img, int bitspp, int colourmaplength) {
  int i;
  int bytepp = bpp_to_bytes(bitspp);
  size_t palbsize = i_colorcount(img)*bytepp;
  unsigned char *palbuf = mymalloc(palbsize);
  
  for(i=0; i<colourmaplength; i++) {
    i_color val;
    i_getcolors(img, i, &val, 1);
    color_pack(palbuf+i*bytepp, bitspp, &val);
  }
  
  if (ig->writecb(ig, palbuf, palbsize) != palbsize) {
    i_push_error(errno, "could not write targa colourmap");
    return 0;
  }
  myfree(palbuf);
  return 1;
}



/*
=item i_readtga_wiol(ig, length)

Read in an image from the iolayer data source and return the image structure to it.
Returns NULL on error.

ig - io_glue object
length - maximum length to read from data source, before closing it -1
signifies no limit.

=cut
*/

i_img *
i_readtga_wiol(io_glue *ig, int length) {
  i_img* img = NULL;
  int x, y;
  int width, height, channels;
  int mapped;
  char *idstring = NULL;

  tga_source src;
  tga_header header;
  unsigned char headbuf[18];
  unsigned char *databuf;

  i_color *linebuf = NULL;
  i_clear_error();

  mm_log((1,"i_readtga(ig %p, length %d)\n", ig, length));
  
  io_glue_commit_types(ig);

  if (ig->readcb(ig, &headbuf, 18) != 18) {
    i_push_error(errno, "could not read targa header");
    return NULL;
  }

  tga_header_unpack(&header, headbuf);

  mm_log((1,"Id length: %d\n",header.idlength));
  mm_log((1,"Colour map type: %d\n",header.colourmaptype));
  mm_log((1,"Image type: %d\n",header.datatypecode));
  mm_log((1,"Colour map offset: %d\n",header.colourmaporigin));
  mm_log((1,"Colour map length: %d\n",header.colourmaplength));
  mm_log((1,"Colour map depth: %d\n",header.colourmapdepth));
  mm_log((1,"X origin: %d\n",header.x_origin));
  mm_log((1,"Y origin: %d\n",header.y_origin));
  mm_log((1,"Width: %d\n",header.width));
  mm_log((1,"Height: %d\n",header.height));
  mm_log((1,"Bits per pixel: %d\n",header.bitsperpixel));
  mm_log((1,"Descriptor: %d\n",header.imagedescriptor));

  if (header.idlength) {
    idstring = mymalloc(header.idlength+1);
    if (ig->readcb(ig, idstring, header.idlength) != header.idlength) {
      i_push_error(errno, "short read on targa idstring");
      return NULL;
    }
  }

  width = header.width;
  height = header.height;

  
  /* Set tags here */
  
  switch (header.datatypecode) {
  case 0: /* No data in image */
    i_push_error(0, "Targa image contains no image data");
    if (idstring) myfree(idstring);
    return NULL;
    break;
  case 1: /* Uncompressed, color-mapped images */
  case 9: /* Compressed, color-mapped images */
  case 3: /* Uncompressed, grayscale images */
  case 11: /* Compressed, grayscale images */
    if (header.bitsperpixel != 8) {
      i_push_error(0, "Targa: mapped/grayscale image's bpp is not 8, unsupported.");
      if (idstring) myfree(idstring);
      return NULL;
    }
    src.bytepp = 1;
    break;
  case 2: /* Uncompressed, rgb images */
  case 10: /* Compressed, rgb images */
    if ((src.bytepp = bpp_to_bytes(header.bitsperpixel)))
      break;
    i_push_error(0, "Targa: direct color image's bpp is not 15/16/24/32 - unsupported.");
    if (idstring) myfree(idstring);
    return NULL;
    break;
  case 32: /* Compressed color-mapped, Huffman, Delta and runlength */
  case 33: /* Compressed color-mapped, Huffman, Delta and runlength */
    i_push_error(0, "Unsupported Targa (Huffman/delta/rle/quadtree) subformat is not supported");
    if (idstring) myfree(idstring);
    return NULL;
    break;
  default: /* All others which we don't know which might be */
    i_push_error(0, "Unknown targa format");
    if (idstring) myfree(idstring);
    return NULL;
    break;
  }
  
  src.state = NoInit;
  src.len = 0;
  src.ig = ig;
  src.compressed = !!(header.datatypecode & (1<<3));

  /* Determine number of channels */
  
  mapped = 1;
  switch (header.datatypecode) {
  case 2: /* Uncompressed, rgb images */
  case 10: /* Compressed, rgb images */
    mapped = 0;
  case 1: /* Uncompressed, color-mapped images */
  case 9: /* Compressed, color-mapped images */
    if ((channels = bpp_to_channels(mapped ?
header.colourmapdepth :
header.bitsperpixel))) break;
    i_push_error(0, "Targa Image has none of 15/16/24/32 pixel layout");
    if (idstring) myfree(idstring);
    return NULL;
    break;
  case 3: /* Uncompressed, grayscale images */
  case 11: /* Compressed, grayscale images */
    mapped = 0;
    channels = 1;
    break;
  default:
    i_push_error(0, "invalid or unsupported datatype code");
    return NULL;
  }

  if (!i_int_check_image_file_limits(width, height, channels,
sizeof(i_sample_t))) {
    mm_log((1, "i_readtga_wiol: image size exceeds limits\n"));
    return NULL;
  }
  
  img = mapped ?
    i_img_pal_new(width, height, channels, 256) :
    i_img_empty_ch(NULL, width, height, channels);

  if (!img) {
    if (idstring)
      myfree(idstring);
    return NULL;
  }
  
  if (idstring) {
    i_tags_add(&img->tags, "tga_idstring", 0, idstring, header.idlength, 0);
    myfree(idstring);
  }

  if (mapped &&
      !tga_palette_read(ig,
img,
bpp_to_bytes(header.colourmapdepth),
header.colourmaplength)
      ) {
    i_push_error(0, "Targa Image has none of 15/16/24/32 pixel layout");
    if (idstring) myfree(idstring);
    if (img) i_img_destroy(img);
    return NULL;
  }
  
  /* Allocate buffers */
  databuf = mymalloc(width*src.bytepp);
  if (!mapped) linebuf = mymalloc(width*sizeof(i_color));
  
  for(y=0; y<height; y++) {
    if (!tga_source_read(&src, databuf, width)) {
      i_push_error(errno, "read for targa data failed");
      myfree(databuf);
      if (img) i_img_destroy(img);
      return NULL;
    }
    if (mapped && header.colourmaporigin) for(x=0; x<width; x++) databuf[x] -= header.colourmaporigin;
    if (mapped) i_ppal(img, 0, width, header.imagedescriptor & (1<<5) ? y : height-1-y, databuf);
    else {
      for(x=0; x<width; x++) color_unpack(databuf+x*src.bytepp, src.bytepp, linebuf+x);
      i_plin(img, 0, width, header.imagedescriptor & (1<<5) ? y : height-1-y, linebuf);
    }
  }
  myfree(databuf);
  if (linebuf) myfree(linebuf);
  
  i_tags_add(&img->tags, "i_format", 0, "tga", -1, 0);
  i_tags_addn(&img->tags, "tga_bitspp", 0, mapped?header.colourmapdepth:header.bitsperpixel);
  if (src.compressed) i_tags_addn(&img->tags, "compressed", 0, 1);
  return img;
}



/*
=item i_writetga_wiol(img, ig)

Writes an image in targa format. Returns 0 on error.

img - image to store
ig - io_glue object

=cut
*/

undef_int
i_writetga_wiol(i_img *img, io_glue *ig, int wierdpack, int compress, char *idstring, size_t idlen) {
  tga_header header;
  tga_dest dest;
  unsigned char headbuf[18];
  unsigned int bitspp;
  
  int mapped;

  /* parameters */

  /*
int compress = 1;
char *idstring = "testing";
int wierdpack = 0;
*/

  idlen = strlen(idstring);
  mapped = img->type == i_palette_type;

  mm_log((1,"i_writetga_wiol(img %p, ig %p, idstring %p, idlen %d, wierdpack %d, compress %d)\n",
img, ig, idstring, idlen, wierdpack, compress));
  mm_log((1, "virtual %d, paletted %d\n", img->virtual, mapped));
  mm_log((1, "channels %d\n", img->channels));
  
  i_clear_error();
  io_glue_commit_types(ig);
  
  switch (img->channels) {
  case 1:
    bitspp = 8;
    if (wierdpack) {
      mm_log((1,"wierdpack option ignored for 1 channel images\n"));
      wierdpack=0;
    }
    break;
  case 2:
    i_push_error(0, "Cannot store 2 channel image in targa format");
    return 0;
    break;
  case 3:
    bitspp = wierdpack ? 15 : 24;
    break;
  case 4:
    bitspp = wierdpack ? 16 : 32;
    break;
  default:
    i_push_error(0, "Targa only handles 1,3 and 4 channel images.");
    return 0;
  }

  header.idlength = idlen;
  header.colourmaptype = mapped ? 1 : 0;
  header.datatypecode = mapped ? 1 : img->channels == 1 ? 3 : 2;
  header.datatypecode += compress ? 8 : 0;
  mm_log((1, "datatypecode %d\n", header.datatypecode));
  header.colourmaporigin = 0;
  header.colourmaplength = mapped ? i_colorcount(img) : 0;
  header.colourmapdepth = mapped ? bitspp : 0;
  header.x_origin = 0;
  header.y_origin = 0;
  header.width = img->xsize;
  header.height = img->ysize;
  header.bitsperpixel = mapped ? 8 : bitspp;
  header.imagedescriptor = (1<<5); /* normal order instead of upside down */

  tga_header_pack(&header, headbuf);

  if (ig->writecb(ig, &headbuf, sizeof(headbuf)) != sizeof(headbuf)) {
    i_push_error(errno, "could not write targa header");
    return 0;
  }

  if (idlen) {
    if (ig->writecb(ig, idstring, idlen) != idlen) {
      i_push_error(errno, "could not write targa idstring");
      return 0;
    }
  }
  
  /* Make this into a constructor? */
  dest.compressed = compress;
  dest.bytepp = mapped ? 1 : bpp_to_bytes(bitspp);
  dest.ig = ig;

  mm_log((1, "dest.compressed = %d\n", dest.compressed));
  mm_log((1, "dest.bytepp = %d\n", dest.bytepp));

  if (img->type == i_palette_type) {
    if (!tga_palette_write(ig, img, bitspp, i_colorcount(img))) return 0;
    
    if (!img->virtual && !dest.compressed) {
      if (ig->writecb(ig, img->idata, img->bytes) != img->bytes) {
i_push_error(errno, "could not write targa image data");
return 0;
      }
    } else {
      int y;
      i_palidx *vals = mymalloc(sizeof(i_palidx)*img->xsize);
      for(y=0; y<img->ysize; y++) {
i_gpal(img, 0, img->xsize, y, vals);
tga_dest_write(&dest, vals, img->xsize);
      }
      myfree(vals);
    }
  } else { /* direct type */
    int x, y;
    int bytepp = wierdpack ? 2 : bpp_to_bytes(bitspp);
    int lsize = bytepp * img->xsize;
    i_color *vals = mymalloc(img->xsize*sizeof(i_color));
    unsigned char *buf = mymalloc(lsize);
    
    for(y=0; y<img->ysize; y++) {
      i_glin(img, 0, img->xsize, y, vals);
      for(x=0; x<img->xsize; x++) color_pack(buf+x*bytepp, bitspp, vals+x);
      tga_dest_write(&dest, buf, img->xsize);
    }
    myfree(buf);
    myfree(vals);
  }

  ig->closecb(ig);

  return 1;
}

/*
=back

=head1 AUTHOR

Arnar M. Hrafnkelsson <addi@umich.edu>

=head1 SEE ALSO

Imager(3)

=cut
*/
Something went wrong with that request. Please try again.