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
|
/*
* jpeg - This file provides interface routines to connect xloadimage to
* the jpeg decoding routines taken from the Independent JPEG Group's
* free JPEG software. See jpeg.README for more information.
*
* This code is based on example.c from the IJG v4 distribution.
*/
#include "image.h" /* xloadimage declarations */
#include "jpeg.conf.h" /* definitions used in jpeg directory */
#include "jpeg/jinclude.h" /* IJG declarations */
#include <setjmp.h> /* need setjmp/longjmp */
/* Error-catching routines */
static char *filename;
static unsigned int verbose;
static unsigned int identify;
static jmp_buf setjmp_buffer; /* for return to caller */
static external_methods_ptr emethods; /* needed for access to message_parm */
static void
trace_message (msgtext)
char *msgtext;
{
fprintf(stderr, "jpegLoad: %s - ", filename);
fprintf(stderr, msgtext,
emethods->message_parm[0], emethods->message_parm[1],
emethods->message_parm[2], emethods->message_parm[3],
emethods->message_parm[4], emethods->message_parm[5],
emethods->message_parm[6], emethods->message_parm[7]);
fprintf(stderr, "\n"); /* there is no \n in the format string! */
}
static void
error_exit (msgtext)
char *msgtext;
{
trace_message(msgtext); /* report the error message */
(*emethods->free_all) (); /* clean up memory allocation & temp files */
longjmp(setjmp_buffer, 1); /* return control to outer routine */
}
/* Output-acceptance routines */
static Image *image; /* xloadimage image being returned */
static int rows_put; /* Number of rows copied to image */
static void
output_init (cinfo)
decompress_info_ptr cinfo;
/* Initialize for output */
{
int i;
if (cinfo->out_color_space == CS_GRAYSCALE) {
image = newRGBImage(cinfo->image_width,cinfo->image_height,8);
image->title = dupString(filename);
/* set a linear map */
for(i=0;i<256;i++) {
*(image->rgb.red + i) =
*(image->rgb.green + i) =
*(image->rgb.blue + i) = i<<8;
}
image->rgb.used = 256;
} else if (cinfo->out_color_space == CS_RGB) {
image = newTrueImage(cinfo->image_width,cinfo->image_height);
image->title = dupString(filename);
} else {
image = NULL;
ERREXIT(cinfo->emethods, "Cannot cope with JPEG image colorspace");
}
rows_put = 0;
}
static void
put_color_map (cinfo, num_colors, colormap)
decompress_info_ptr cinfo;
int num_colors;
JSAMPARRAY colormap;
/* Write the color map -- should not be called */
{
fprintf(stderr, "put_color_map called: there is a bug here somewhere!\n");
}
static void
put_pixel_rows (cinfo, num_rows, pixel_data)
decompress_info_ptr cinfo;
int num_rows;
JSAMPIMAGE pixel_data;
/* Write some rows of output data */
{
register unsigned char *bufp;
register JSAMPROW ptr0, ptr1, ptr2;
register long col;
long width = cinfo->image_width;
int row;
if (cinfo->out_color_space == CS_GRAYSCALE) {
bufp = image->data + rows_put * width;
/* Assume JSAMPLE == chars */
for (row = 0; row < num_rows; row++) {
bcopy(pixel_data[0][row],bufp,width);
bufp += width;
}
} else {
bufp = image->data + rows_put * width * 3;
for (row = 0; row < num_rows; row++) {
ptr0 = pixel_data[0][row];
ptr1 = pixel_data[1][row];
ptr2 = pixel_data[2][row];
for (col = width; col > 0; col--) {
*bufp++ = *ptr0++;
*bufp++ = *ptr1++;
*bufp++ = *ptr2++;
}
}
}
rows_put += num_rows;
}
static void
output_term (cinfo)
decompress_info_ptr cinfo;
/* Finish up at the end of the output */
{
/* No work here */
}
/* Input-file-reading routine */
static ZFILE * input_file; /* tells input routine where to read JPEG */
static int
read_jpeg_data (cinfo)
decompress_info_ptr cinfo;
{
cinfo->next_input_byte = cinfo->input_buffer + MIN_UNGET;
cinfo->bytes_in_buffer = zread(input_file,
(byte *)cinfo->next_input_byte,
JPEG_BUF_SIZE);
if (cinfo->bytes_in_buffer <= 0) {
WARNMS(cinfo->emethods, "Premature EOF in JPEG file");
cinfo->next_input_byte[0] = (char) 0xFF;
cinfo->next_input_byte[1] = (char) 0xD9; /* EOI marker */
cinfo->bytes_in_buffer = 2;
}
return JGETC(cinfo);
}
/* Required control-hook routine */
static void
d_ui_method_selection (cinfo)
decompress_info_ptr cinfo;
{
/* if grayscale input, force grayscale output; */
/* else leave the output colorspace as set by main routine. */
if (cinfo->jpeg_color_space == CS_GRAYSCALE)
cinfo->out_color_space = CS_GRAYSCALE;
/* Create display of image parameters */
if (verbose) {
printf("%s is a %dx%d JPEG image, color space ", filename,
cinfo->image_width, cinfo->image_height);
switch (cinfo->jpeg_color_space) {
case CS_UNKNOWN:
printf("Unknown");
break;
case CS_GRAYSCALE:
printf("Grayscale");
break;
case CS_RGB:
printf("RGB");
break;
case CS_YCbCr:
printf("YCbCr");
break;
case CS_YIQ:
printf("YIQ");
break;
case CS_CMYK:
printf("CMYK");
break;
}
printf(", %d comp%s,", cinfo->num_components,
cinfo->num_components ? "s." : ".");
if (cinfo->arith_code)
printf(" Arithmetic coding\n");
else
printf(" Huffman coding\n");
}
/* Turn off caching beyond this point of the file */
znocache(input_file);
/* If we only wanted to identify the image, abort now */
if (identify) {
(*emethods->free_all) (); /* clean up memory allocation & temp files */
longjmp(setjmp_buffer, 10); /* return control with success code */
}
/* select output routines */
cinfo->methods->output_init = output_init;
cinfo->methods->put_color_map = put_color_map;
cinfo->methods->put_pixel_rows = put_pixel_rows;
cinfo->methods->output_term = output_term;
}
/* Main control routine for loading */
Image *
jpegLoad (fullname, name, vbose)
char *fullname, *name;
unsigned int vbose;
{
struct Decompress_info_struct cinfo;
struct Decompress_methods_struct dc_methods;
struct External_methods_struct e_methods;
input_file = zopen(fullname); /* Open the input file */
if (input_file == NULL)
return NULL;
/* Quick check to see if file starts with JPEG SOI marker */
if (zgetc(input_file) != 0xFF || zgetc(input_file) != 0xD8) {
zclose(input_file);
return NULL;
}
filename = name; /* copy parms to static vars */
verbose = vbose;
identify = 0;
image = NULL; /* in case we fail before creating image */
cinfo.methods = &dc_methods; /* links to method structs */
cinfo.emethods = &e_methods;
emethods = &e_methods; /* save struct addr for possible access */
e_methods.error_exit = error_exit; /* supply error-exit routine */
e_methods.trace_message = trace_message; /* supply trace-message routine */
e_methods.trace_level = 0; /* default = no tracing */
e_methods.num_warnings = 0; /* no warnings emitted yet */
e_methods.first_warning_level = 0; /* display first corrupt-data warning */
e_methods.more_warning_level = 3; /* but suppress additional ones */
/* prepare setjmp context for possible exit from error_exit */
if (setjmp(setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error. */
/* Return as much of the image as we could get. */
zclose(input_file);
return image;
}
jselmemmgr(&e_methods); /* select std memory allocation routines */
/* Set up default decompression parameters. */
j_d_defaults(&cinfo, TRUE);
/* Override default methods */
dc_methods.d_ui_method_selection = d_ui_method_selection;
dc_methods.read_jpeg_data = read_jpeg_data;
/* Insert fake SOI into the input buffer --- needed cause we read it above */
cinfo.next_input_byte = cinfo.input_buffer + MIN_UNGET;
cinfo.next_input_byte[0] = (char) 0xFF;
cinfo.next_input_byte[1] = (char) 0xD8; /* SOI marker */
cinfo.bytes_in_buffer = 2;
/* Set up to read a JFIF or baseline-JPEG file. */
/* This is the only JPEG file format currently supported. */
jselrjfif(&cinfo);
/* Here we go! */
jpeg_decompress(&cinfo);
zclose(input_file); /* Done, close the input file */
return image;
}
/* Main control routine for identifying JPEG without loading */
int
jpegIdent (fullname, name)
char *fullname, *name;
{
struct Decompress_info_struct cinfo;
struct Decompress_methods_struct dc_methods;
struct External_methods_struct e_methods;
input_file = zopen(fullname); /* Open the input file */
if (input_file == NULL)
return 0;
/* Quick check to see if file starts with JPEG SOI marker */
if (zgetc(input_file) != 0xFF || zgetc(input_file) != 0xD8) {
zclose(input_file);
return 0;
}
/* We want to find and display the image dimensions, and also
* verify that the header markers are not corrupt. To do this,
* we fire up the JPEG decoder as normal, but when d_ui_method_selection
* is called, we abort the process by longjmp'ing back here.
* This works nicely since the headers are all read at that point.
*/
filename = name; /* copy parms to static vars */
verbose = 1;
identify = 1;
cinfo.methods = &dc_methods; /* links to method structs */
cinfo.emethods = &e_methods;
emethods = &e_methods; /* save struct addr for possible access */
e_methods.error_exit = error_exit; /* supply error-exit routine */
e_methods.trace_message = trace_message; /* supply trace-message routine */
e_methods.trace_level = 0; /* default = no tracing */
e_methods.num_warnings = 0; /* no warnings emitted yet */
e_methods.first_warning_level = 0; /* display first corrupt-data warning */
e_methods.more_warning_level = 3; /* but suppress additional ones */
/* prepare setjmp context for expected exit via longjmp */
switch (setjmp(setjmp_buffer)) {
case 0:
/* First time thru, keep going */
break;
case 10:
/* Successful exit from d_ui_method_selection; return A-OK */
zclose(input_file);
return 1;
default:
/* If we get here, the JPEG code has signaled an error. */
/* Return 0 since error in the headers means the image is unloadable. */
zclose(input_file);
return 0;
}
jselmemmgr(&e_methods); /* select std memory allocation routines */
/* Set up default decompression parameters. */
j_d_defaults(&cinfo, TRUE);
/* Override default methods */
dc_methods.d_ui_method_selection = d_ui_method_selection;
dc_methods.read_jpeg_data = read_jpeg_data;
/* Insert fake SOI into the input buffer --- needed cause we read it above */
cinfo.next_input_byte = cinfo.input_buffer + MIN_UNGET;
cinfo.next_input_byte[0] = (char) 0xFF;
cinfo.next_input_byte[1] = (char) 0xD8; /* SOI marker */
cinfo.bytes_in_buffer = 2;
/* Set up to read a JFIF or baseline-JPEG file. */
/* This is the only JPEG file format currently supported. */
jselrjfif(&cinfo);
/* Here we go! */
jpeg_decompress(&cinfo);
/* Don't expect to get here since d_ui_method_selection should do longjmp */
zclose(input_file);
return 0;
}
/* information necessary to extract image data
*/
static struct {
Image *image;
byte *current_row;
unsigned int bytes_per_row;
} ReadInfo;
static void input_init(cinfo)
compress_info_ptr cinfo;
{
/* this is done in jpegDump()
*/
}
static void input_term(cinfo)
compress_info_ptr cinfo;
{
/* there is no shutdown necessary
*/
}
/* this reads a single raster line
*/
static void read_row(cinfo, pixel_rows)
compress_info_ptr cinfo;
JSAMPARRAY pixel_rows;
{
register int x;
register int pixlen;
register byte *src_row_ptr;
register byte *dest_red_ptr;
register byte *dest_green_ptr;
register byte *dest_blue_ptr;
register Pixel pixval;
register byte mask;
switch (ReadInfo.image->type) {
case IBITMAP:
mask = 0x80;
src_row_ptr = ReadInfo.current_row;
dest_red_ptr = (byte *)pixel_rows[0];
for (x = 0; x < cinfo->image_width; x++) {
pixval = ((*src_row_ptr & mask) > 0 ? 1 : 0);
/* we use the "red" color value under the assumption that they
* are all equal. that can be wrong if the user used -foreground
* or -background. I don't care right now.
*/
*(dest_red_ptr++) = ReadInfo.image->rgb.red[pixval] >> 8;
mask >>= 1;
if (mask == 0) {
mask = 0x80;
src_row_ptr++;
}
}
break;
case IRGB:
/* this expands the pixel value into its components
*/
pixlen = ReadInfo.image->pixlen;
src_row_ptr = ReadInfo.current_row;
dest_red_ptr = (byte *)pixel_rows[0];
dest_green_ptr = (byte *)pixel_rows[1];
dest_blue_ptr = (byte *)pixel_rows[2];
for (x = 0; x < cinfo->image_width; x++) {
pixval = memToVal(src_row_ptr, pixlen);
*(dest_red_ptr++) = ReadInfo.image->rgb.red[pixval] >> 8;
*(dest_green_ptr++) = ReadInfo.image->rgb.green[pixval] >> 8;
*(dest_blue_ptr++) = ReadInfo.image->rgb.blue[pixval] >> 8;
src_row_ptr += pixlen;
}
break;
case ITRUE:
src_row_ptr = ReadInfo.current_row;
dest_red_ptr = (byte *)pixel_rows[0];
dest_green_ptr = (byte *)pixel_rows[1];
dest_blue_ptr = (byte *)pixel_rows[2];
for (x = 0; x < cinfo->image_width; x++) {
*(dest_red_ptr++) = *(src_row_ptr++);
*(dest_green_ptr++) = *(src_row_ptr++);
*(dest_blue_ptr++) = *(src_row_ptr++);
}
break;
}
ReadInfo.current_row += ReadInfo.bytes_per_row;
}
/*
* This routine gets control after the input file header has been read.
* It must determine what output JPEG file format is to be written,
* and make any other compression parameter changes that are desirable.
*/
static void
c_ui_method_selection (cinfo)
compress_info_ptr cinfo;
{
/* If the input is gray scale, generate a monochrome JPEG file. */
if (cinfo->in_color_space == CS_GRAYSCALE)
j_monochrome_default(cinfo);
jselwjfif(cinfo);
}
/* parse options passed to jpegDump
*/
static void parseOptions(cinfo, options, verbose)
compress_info_ptr cinfo;
char *options;
int verbose;
{
char *name, *value;
/* (Re-)initialize the system-dependent error and memory managers. */
jselerror(cinfo->emethods); /* error/trace message routines */
jselmemmgr(cinfo->emethods); /* memory allocation routines */
cinfo->methods->c_ui_method_selection = c_ui_method_selection;
/* Set up default JPEG parameters. */
/* Note that default -quality level here need not, and does not,
* match the default scaling for an explicit -qtables argument.
*/
j_c_defaults(cinfo, 75, FALSE); /* default quality level = 75 */
while (getNextTypeOption(&options, &name, &value) > 0) {
if (!strncmp("arithmetic", name, strlen(name))) {
/* Use arithmetic coding. */
#ifdef C_ARITH_CODING_SUPPORTED
if (verbose)
printf(" Using arithmetic coding.\n");
cinfo->arith_code = TRUE;
#else
fprintf(stderr, "jpegDump: sorry, arithmetic coding not supported\n");
}
#endif
else if (!strncmp("grayscale", name, strlen(name)) ||
!strncmp("greyscale", name, strlen(name)) ||
!strncmp("monochrome", name, strlen(name))) {
/* Force a monochrome JPEG file to be generated. */
if (verbose)
printf(" Creating a grayscale/monochrome file.\n");
j_monochrome_default(cinfo);
}
else if (!strncmp("nointerleave", name, strlen(name))) {
/* Create noninterleaved file. */
#ifdef C_MULTISCAN_FILES_SUPPORTED
if (verbose)
printf(" Creating a noninterleaved file.\n");
cinfo->interleave = FALSE;
#else
fprintf(stderr, "jpegDump: sorry, multiple-scan support was not compiled\n");
#endif
}
else if (!strncmp("optimize", name, strlen(name)) ||
!strncmp("optimise", name, strlen(name))) {
/* Enable entropy parm optimization. */
#ifdef ENTROPY_OPT_SUPPORTED
if (verbose)
printf(" Optimizing entropy.\n");
cinfo->optimize_coding = TRUE;
#else
fprintf(stderr, "jpegDump: sorry, entropy optimization was not compiled\n");
#endif
}
else if (!strncmp("quality", name, strlen(name))) {
/* Quality factor (quantization table scaling factor). */
int val;
if (!value || (sscanf(value, "%d", &val) != 1))
fprintf(stderr, "jpegDump: quality: Invalid quality factor specified.\n");
else {
/* Set quantization tables (will be overridden if -qtables also given).
* Note: we make force_baseline FALSE.
* This means non-baseline JPEG files can be created with low Q values.
* To ensure only baseline files are generated, pass TRUE instead.
*/
if (verbose)
printf(" Using a quality factor of %d.\n", val);
j_set_quality(cinfo, val, FALSE);
#if 0
/* Change scale factor in case -qtables is present. */
q_scale_factor = j_quality_scaling(val);
#endif
}
}
#if 0
else if (!strncmp("qtables", name, strlen(name))) {
/* Quantization tables fetched from file. */
if (!value || !*value)
fprintf(stderr, "jpegDump: No file specified for quantization tables.\n");
else {
if (verbose)
printf(" Using quantization tables loaded from %s.\n", qtablefile);
qtablefile = value;
}
/* we postpone actually reading the file in case -quality comes later */
}
#endif
else if (!strncmp("restart", name, strlen(name))) {
/* Restart interval in MCU rows (or in MCUs with 'b'). */
long lval;
char ch = 'x';
if (!value || (sscanf(value, "%ld%c", &lval, &ch) < 1) ||
(lval < 0) || (lval > 65535L)) {
fprintf(stderr, "jpegDump: restart: Invalid restart interval specified.\n");
continue;
}
if (verbose)
printf(" Using a restart interval of %s.\n", value);
if (ch == 'b' || ch == 'B')
cinfo->restart_interval = (UINT16) lval;
else
cinfo->restart_in_rows = (int) lval;
}
#if 0
else if (!strncmp("sample", name, strlen(name))) {
/* Set sampling factors. */
if (!value)
fprintf(stderr, "jpegDump: sample: No sampling factors specified.\n");
if (verbose)
printf(" Using sampling factors of %s.\n", value);
set_sample_factors(cinfo, value);
}
#endif
else if (!strncmp("smooth", name, strlen(name))) {
/* Set input smoothing factor. */
int val;
if (!value || (sscanf(value, "%d", &val) != 1) ||
(val < 0) || (val > 100))
fprintf(stderr, "jpegDump: smooth: Invalid smoothing factor specified.\n");
else {
if (verbose)
printf(" Using a smoothing factor of %d.\n", val);
cinfo->smoothing_factor = val;
}
}
else
fprintf(stderr, "jpegDump: Unknown option '%s'.\n", name);
}
}
void jpegDump(image, options, file, verbose)
Image *image;
char *options;
char *file;
{
struct Compress_info_struct cinfo;
struct Compress_methods_struct c_methods;
struct External_methods_struct e_methods;
if (verbose)
printf("Dumping JFIF-style JPEG image to %s.\n", file);
/* Set up links to method structures. */
cinfo.methods = &c_methods;
cinfo.emethods = &e_methods;
/* set up "input methods" that handle "reading" from our image file
*/
cinfo.methods->input_init = input_init;
cinfo.methods->input_term = input_term;
cinfo.methods->get_input_row = read_row;
/* set up output file; there is no input file
*/
cinfo.input_file = NULL;
cinfo.output_file = fopen(file, "w");
if (cinfo.output_file == NULL) {
perror(file);
return;
}
ReadInfo.image = image;
ReadInfo.current_row = image->data;
/* parse the options the user gave us
*/
parseOptions(&cinfo, options, verbose);
/* set up image information
*/
cinfo.image_width = image->width;
cinfo.image_height = image->height;
switch (image->type) {
case IBITMAP:
ReadInfo.bytes_per_row = (image->width / 8) + (image->width % 8 ? 1 : 0);
cinfo.input_components = 1;
cinfo.in_color_space = CS_GRAYSCALE;
cinfo.data_precision = 8;
break;
case IRGB:
ReadInfo.bytes_per_row = image->width * image->pixlen;
cinfo.input_components = 3;
cinfo.in_color_space = CS_RGB;
cinfo.data_precision = 8;
break;
case ITRUE:
ReadInfo.bytes_per_row = image->width * image->pixlen;
cinfo.input_components = 3;
cinfo.in_color_space = CS_RGB;
cinfo.data_precision = 8;
break;
}
/* compress, baby
*/
jpeg_compress(&cinfo);
fclose(cinfo.output_file);
return;
}
|