File size: 55,245 Bytes
9375c9a |
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 |
<html><!-- Created using the cpp_pretty_printer from the dlib C++ library. See http://dlib.net for updates. --><head><title>dlib C++ Library - jcdctmgr.c</title></head><body bgcolor='white'><pre>
<font color='#009900'>/*
* jcdctmgr.c
*
* Copyright (C) 1994-1996, Thomas G. Lane.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
* This file contains the forward-DCT management logic.
* This code selects a particular DCT implementation to be used,
* and it performs related housekeeping chores including coefficient
* quantization.
*/</font>
<font color='#0000FF'>#define</font> JPEG_INTERNALS
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jinclude.h.html'>jinclude.h</a>"
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jpeglib.h.html'>jpeglib.h</a>"
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jdct.h.html'>jdct.h</a>" <font color='#009900'>/* Private declarations for DCT subsystem */</font>
<font color='#009900'>/* Private subobject for this module */</font>
<font color='#0000FF'>typedef</font> <font color='#0000FF'>struct</font> <b>{</b>
<font color='#0000FF'>struct</font> jpeg_forward_dct pub; <font color='#009900'>/* public fields */</font>
<font color='#009900'>/* Pointer to the DCT routine actually in use */</font>
forward_DCT_method_ptr do_dct[MAX_COMPONENTS];
<font color='#009900'>/* The actual post-DCT divisors --- not identical to the quant table
* entries, because of scaling (especially for an unnormalized DCT).
* Each table is given in normal array order.
*/</font>
DCTELEM <font color='#5555FF'>*</font> divisors[NUM_QUANT_TBLS];
<font color='#0000FF'>#ifdef</font> DCT_FLOAT_SUPPORTED
<font color='#009900'>/* Same as above for the floating-point case. */</font>
float_DCT_method_ptr do_float_dct[MAX_COMPONENTS];
FAST_FLOAT <font color='#5555FF'>*</font> float_divisors[NUM_QUANT_TBLS];
<font color='#0000FF'>#endif</font>
<b>}</b> my_fdct_controller;
<font color='#0000FF'>typedef</font> my_fdct_controller <font color='#5555FF'>*</font> my_fdct_ptr;
<font color='#009900'>/* The current scaled-DCT routines require ISLOW-style divisor tables,
* so be sure to compile that code if either ISLOW or SCALING is requested.
*/</font>
<font color='#0000FF'>#ifdef</font> DCT_ISLOW_SUPPORTED
<font color='#0000FF'>#define</font> PROVIDE_ISLOW_TABLES
<font color='#0000FF'>#else</font>
<font color='#0000FF'>#ifdef</font> DCT_SCALING_SUPPORTED
<font color='#0000FF'>#define</font> PROVIDE_ISLOW_TABLES
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>#endif</font>
<font color='#009900'>/*
* Perform forward DCT on one or more blocks of a component.
*
* The input samples are taken from the sample_data[] array starting at
* position start_row/start_col, and moving to the right for any additional
* blocks. The quantized coefficients are returned in coef_blocks[].
*/</font>
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
<b><a name='forward_DCT'></a>forward_DCT</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
JDIMENSION start_row, JDIMENSION start_col,
JDIMENSION num_blocks<font face='Lucida Console'>)</font>
<font color='#009900'>/* This version is used for integer DCT implementations. */</font>
<b>{</b>
<font color='#009900'>/* This routine is heavily used, so it's worth coding it tightly. */</font>
my_fdct_ptr fdct <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_fdct_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>fdct;
forward_DCT_method_ptr do_dct <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>component_index];
DCTELEM <font color='#5555FF'>*</font> divisors <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>quant_tbl_no];
DCTELEM workspace[DCTSIZE2]; <font color='#009900'>/* work area for FDCT subroutine */</font>
JDIMENSION bi;
sample_data <font color='#5555FF'>+</font><font color='#5555FF'>=</font> start_row; <font color='#009900'>/* fold in the vertical offset once */</font>
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>bi <font color='#5555FF'>=</font> <font color='#979000'>0</font>; bi <font color='#5555FF'><</font> num_blocks; bi<font color='#5555FF'>+</font><font color='#5555FF'>+</font>, start_col <font color='#5555FF'>+</font><font color='#5555FF'>=</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_h_scaled_size<font face='Lucida Console'>)</font> <b>{</b>
<font color='#009900'>/* Perform the DCT */</font>
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>do_dct<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>workspace, sample_data, start_col<font face='Lucida Console'>)</font>;
<font color='#009900'>/* Quantize/descale the coefficients, and store into coef_blocks[] */</font>
<b>{</b> <font color='#0000FF'>register</font> DCTELEM temp, qval;
<font color='#0000FF'>register</font> <font color='#0000FF'><u>int</u></font> i;
<font color='#0000FF'>register</font> JCOEFPTR output_ptr <font color='#5555FF'>=</font> coef_blocks[bi];
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> DCTSIZE2; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
qval <font color='#5555FF'>=</font> divisors[i];
temp <font color='#5555FF'>=</font> workspace[i];
<font color='#009900'>/* Divide the coefficient value by qval, ensuring proper rounding.
* Since C does not specify the direction of rounding for negative
* quotients, we have to force the dividend positive for portability.
*
* In most files, at least half of the output values will be zero
* (at default quantization settings, more like three-quarters...)
* so we should ensure that this case is fast. On many machines,
* a comparison is enough cheaper than a divide to make a special test
* a win. Since both inputs will be nonnegative, we need only test
* for a < b to discover whether a/b is 0.
* If your machine's division is fast enough, define FAST_DIVIDE.
*/</font>
<font color='#0000FF'>#ifdef</font> FAST_DIVIDE
<font color='#0000FF'>#define</font> DIVIDE_BY<font face='Lucida Console'>(</font>a,b<font face='Lucida Console'>)</font> a <font color='#5555FF'>/</font><font color='#5555FF'>=</font> b
<font color='#0000FF'>#else</font>
<font color='#0000FF'>#define</font> DIVIDE_BY<font face='Lucida Console'>(</font>a,b<font face='Lucida Console'>)</font> <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>a <font color='#5555FF'>></font><font color='#5555FF'>=</font> b<font face='Lucida Console'>)</font> a <font color='#5555FF'>/</font><font color='#5555FF'>=</font> b; <font color='#0000FF'>else</font> a <font color='#5555FF'>=</font> <font color='#979000'>0</font>
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>temp <font color='#5555FF'><</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font> <b>{</b>
temp <font color='#5555FF'>=</font> <font color='#5555FF'>-</font>temp;
temp <font color='#5555FF'>+</font><font color='#5555FF'>=</font> qval<font color='#5555FF'>></font><font color='#5555FF'>></font><font color='#979000'>1</font>; <font color='#009900'>/* for rounding */</font>
<font color='#BB00BB'>DIVIDE_BY</font><font face='Lucida Console'>(</font>temp, qval<font face='Lucida Console'>)</font>;
temp <font color='#5555FF'>=</font> <font color='#5555FF'>-</font>temp;
<b>}</b> <font color='#0000FF'>else</font> <b>{</b>
temp <font color='#5555FF'>+</font><font color='#5555FF'>=</font> qval<font color='#5555FF'>></font><font color='#5555FF'>></font><font color='#979000'>1</font>; <font color='#009900'>/* for rounding */</font>
<font color='#BB00BB'>DIVIDE_BY</font><font face='Lucida Console'>(</font>temp, qval<font face='Lucida Console'>)</font>;
<b>}</b>
output_ptr[i] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JCOEF<font face='Lucida Console'>)</font> temp;
<b>}</b>
<b>}</b>
<b>}</b>
<b>}</b>
<font color='#0000FF'>#ifdef</font> DCT_FLOAT_SUPPORTED
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
<b><a name='forward_DCT_float'></a>forward_DCT_float</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo, jpeg_component_info <font color='#5555FF'>*</font> compptr,
JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
JDIMENSION start_row, JDIMENSION start_col,
JDIMENSION num_blocks<font face='Lucida Console'>)</font>
<font color='#009900'>/* This version is used for floating-point DCT implementations. */</font>
<b>{</b>
<font color='#009900'>/* This routine is heavily used, so it's worth coding it tightly. */</font>
my_fdct_ptr fdct <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_fdct_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>fdct;
float_DCT_method_ptr do_dct <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_float_dct[compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>component_index];
FAST_FLOAT <font color='#5555FF'>*</font> divisors <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>float_divisors[compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>quant_tbl_no];
FAST_FLOAT workspace[DCTSIZE2]; <font color='#009900'>/* work area for FDCT subroutine */</font>
JDIMENSION bi;
sample_data <font color='#5555FF'>+</font><font color='#5555FF'>=</font> start_row; <font color='#009900'>/* fold in the vertical offset once */</font>
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>bi <font color='#5555FF'>=</font> <font color='#979000'>0</font>; bi <font color='#5555FF'><</font> num_blocks; bi<font color='#5555FF'>+</font><font color='#5555FF'>+</font>, start_col <font color='#5555FF'>+</font><font color='#5555FF'>=</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_h_scaled_size<font face='Lucida Console'>)</font> <b>{</b>
<font color='#009900'>/* Perform the DCT */</font>
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>do_dct<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>workspace, sample_data, start_col<font face='Lucida Console'>)</font>;
<font color='#009900'>/* Quantize/descale the coefficients, and store into coef_blocks[] */</font>
<b>{</b> <font color='#0000FF'>register</font> FAST_FLOAT temp;
<font color='#0000FF'>register</font> <font color='#0000FF'><u>int</u></font> i;
<font color='#0000FF'>register</font> JCOEFPTR output_ptr <font color='#5555FF'>=</font> coef_blocks[bi];
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> DCTSIZE2; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
<font color='#009900'>/* Apply the quantization and scaling factor */</font>
temp <font color='#5555FF'>=</font> workspace[i] <font color='#5555FF'>*</font> divisors[i];
<font color='#009900'>/* Round to nearest integer.
* Since C does not specify the direction of rounding for negative
* quotients, we have to force the dividend positive for portability.
* The maximum coefficient size is +-16K (for 12-bit data), so this
* code should work for either 16-bit or 32-bit ints.
*/</font>
output_ptr[i] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JCOEF<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>int</u></font><font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>temp <font color='#5555FF'>+</font> <font face='Lucida Console'>(</font>FAST_FLOAT<font face='Lucida Console'>)</font> <font color='#979000'>16384.5</font><font face='Lucida Console'>)</font> <font color='#5555FF'>-</font> <font color='#979000'>16384</font><font face='Lucida Console'>)</font>;
<b>}</b>
<b>}</b>
<b>}</b>
<b>}</b>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* DCT_FLOAT_SUPPORTED */</font>
<font color='#009900'>/*
* Initialize for a processing pass.
* Verify that all referenced Q-tables are present, and set up
* the divisor table for each one.
* In the current implementation, DCT of all components is done during
* the first pass, even if only some components will be output in the
* first scan. Hence all components should be examined here.
*/</font>
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
<b><a name='start_pass_fdctmgr'></a>start_pass_fdctmgr</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo<font face='Lucida Console'>)</font>
<b>{</b>
my_fdct_ptr fdct <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_fdct_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>fdct;
<font color='#0000FF'><u>int</u></font> ci, qtblno, i;
jpeg_component_info <font color='#5555FF'>*</font>compptr;
<font color='#0000FF'><u>int</u></font> method <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
JQUANT_TBL <font color='#5555FF'>*</font> qtbl;
DCTELEM <font color='#5555FF'>*</font> dtbl;
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>ci <font color='#5555FF'>=</font> <font color='#979000'>0</font>, compptr <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>comp_info; ci <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>num_components;
ci<font color='#5555FF'>+</font><font color='#5555FF'>+</font>, compptr<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
<font color='#009900'>/* Select the proper DCT routine for this component's scaling */</font>
<font color='#0000FF'>switch</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_h_scaled_size <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_v_scaled_size<font face='Lucida Console'>)</font> <b>{</b>
<font color='#0000FF'>#ifdef</font> DCT_SCALING_SUPPORTED
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>1</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_1x1;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>2</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>2</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_2x2;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>3</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>3</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_3x3;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>4</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>4</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_4x4;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>5</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>5</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_5x5;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>6</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>6</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_6x6;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>7</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>7</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_7x7;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>9</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>9</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_9x9;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>10</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>10</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_10x10;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>11</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>11</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_11x11;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>12</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>12</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_12x12;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>13</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>13</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_13x13;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>14</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>14</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_14x14;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>15</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>15</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_15x15;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>16</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>16</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_16x16;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>16</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_16x8;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>14</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>7</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_14x7;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>12</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>6</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_12x6;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>10</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>5</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_10x5;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>8</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>4</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_8x4;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>6</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>3</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_6x3;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>4</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>2</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_4x2;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>2</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_2x1;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>8</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>16</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_8x16;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>7</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>14</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_7x14;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>6</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>12</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_6x12;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>5</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>10</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_5x10;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>4</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_4x8;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>3</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>6</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_3x6;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>2</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>4</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_2x4;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#979000'>1</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>2</font><font face='Lucida Console'>)</font>:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_1x2;
method <font color='#5555FF'>=</font> JDCT_ISLOW; <font color='#009900'>/* jfdctint uses islow-style table */</font>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>case</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTSIZE <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>8</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> DCTSIZE<font face='Lucida Console'>)</font>:
<font color='#0000FF'>switch</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>dct_method<font face='Lucida Console'>)</font> <b>{</b>
<font color='#0000FF'>#ifdef</font> DCT_ISLOW_SUPPORTED
<font color='#0000FF'>case</font> JDCT_ISLOW:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_islow;
method <font color='#5555FF'>=</font> JDCT_ISLOW;
<font color='#0000FF'>break</font>;
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>#ifdef</font> DCT_IFAST_SUPPORTED
<font color='#0000FF'>case</font> JDCT_IFAST:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_ifast;
method <font color='#5555FF'>=</font> JDCT_IFAST;
<font color='#0000FF'>break</font>;
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>#ifdef</font> DCT_FLOAT_SUPPORTED
<font color='#0000FF'>case</font> JDCT_FLOAT:
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>do_float_dct[ci] <font color='#5555FF'>=</font> jpeg_fdct_float;
method <font color='#5555FF'>=</font> JDCT_FLOAT;
<font color='#0000FF'>break</font>;
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>default</font>:
<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_NOT_COMPILED<font face='Lucida Console'>)</font>;
<font color='#0000FF'>break</font>;
<b>}</b>
<font color='#0000FF'>break</font>;
<font color='#0000FF'>default</font>:
<font color='#BB00BB'>ERREXIT2</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_DCTSIZE,
compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_h_scaled_size, compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_v_scaled_size<font face='Lucida Console'>)</font>;
<font color='#0000FF'>break</font>;
<b>}</b>
qtblno <font color='#5555FF'>=</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>quant_tbl_no;
<font color='#009900'>/* Make sure specified quantization table is present */</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>qtblno <font color='#5555FF'><</font> <font color='#979000'>0</font> <font color='#5555FF'>|</font><font color='#5555FF'>|</font> qtblno <font color='#5555FF'>></font><font color='#5555FF'>=</font> NUM_QUANT_TBLS <font color='#5555FF'>|</font><font color='#5555FF'>|</font>
cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>quant_tbl_ptrs[qtblno] <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
<font color='#BB00BB'>ERREXIT1</font><font face='Lucida Console'>(</font>cinfo, JERR_NO_QUANT_TABLE, qtblno<font face='Lucida Console'>)</font>;
qtbl <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>quant_tbl_ptrs[qtblno];
<font color='#009900'>/* Compute divisors for this quant table */</font>
<font color='#009900'>/* We may do this more than once for same table, but it's not a big deal */</font>
<font color='#0000FF'>switch</font> <font face='Lucida Console'>(</font>method<font face='Lucida Console'>)</font> <b>{</b>
<font color='#0000FF'>#ifdef</font> PROVIDE_ISLOW_TABLES
<font color='#0000FF'>case</font> JDCT_ISLOW:
<font color='#009900'>/* For LL&M IDCT method, divisors are equal to raw quantization
* coefficients multiplied by 8 (to counteract scaling).
*/</font>
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[qtblno] <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <b>{</b>
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[qtblno] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_IMAGE,
DCTSIZE2 <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>DCTELEM<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b>}</b>
dtbl <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[qtblno];
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> DCTSIZE2; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
dtbl[i] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>DCTELEM<font face='Lucida Console'>)</font> qtbl<font color='#5555FF'>-</font><font color='#5555FF'>></font>quantval[i]<font face='Lucida Console'>)</font> <font color='#5555FF'><</font><font color='#5555FF'><</font> <font color='#979000'>3</font>;
<b>}</b>
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.forward_DCT[ci] <font color='#5555FF'>=</font> forward_DCT;
<font color='#0000FF'>break</font>;
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>#ifdef</font> DCT_IFAST_SUPPORTED
<font color='#0000FF'>case</font> JDCT_IFAST:
<b>{</b>
<font color='#009900'>/* For AA&N IDCT method, divisors are equal to quantization
* coefficients scaled by scalefactor[row]*scalefactor[col], where
* scalefactor[0] = 1
* scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7
* We apply a further scale factor of 8.
*/</font>
<font color='#0000FF'>#define</font> CONST_BITS <font color='#979000'>14</font>
<font color='#0000FF'>static</font> <font color='#0000FF'>const</font> INT16 aanscales[DCTSIZE2] <font color='#5555FF'>=</font> <b>{</b>
<font color='#009900'>/* precomputed values scaled up by 14 bits */</font>
<font color='#979000'>16384</font>, <font color='#979000'>22725</font>, <font color='#979000'>21407</font>, <font color='#979000'>19266</font>, <font color='#979000'>16384</font>, <font color='#979000'>12873</font>, <font color='#979000'>8867</font>, <font color='#979000'>4520</font>,
<font color='#979000'>22725</font>, <font color='#979000'>31521</font>, <font color='#979000'>29692</font>, <font color='#979000'>26722</font>, <font color='#979000'>22725</font>, <font color='#979000'>17855</font>, <font color='#979000'>12299</font>, <font color='#979000'>6270</font>,
<font color='#979000'>21407</font>, <font color='#979000'>29692</font>, <font color='#979000'>27969</font>, <font color='#979000'>25172</font>, <font color='#979000'>21407</font>, <font color='#979000'>16819</font>, <font color='#979000'>11585</font>, <font color='#979000'>5906</font>,
<font color='#979000'>19266</font>, <font color='#979000'>26722</font>, <font color='#979000'>25172</font>, <font color='#979000'>22654</font>, <font color='#979000'>19266</font>, <font color='#979000'>15137</font>, <font color='#979000'>10426</font>, <font color='#979000'>5315</font>,
<font color='#979000'>16384</font>, <font color='#979000'>22725</font>, <font color='#979000'>21407</font>, <font color='#979000'>19266</font>, <font color='#979000'>16384</font>, <font color='#979000'>12873</font>, <font color='#979000'>8867</font>, <font color='#979000'>4520</font>,
<font color='#979000'>12873</font>, <font color='#979000'>17855</font>, <font color='#979000'>16819</font>, <font color='#979000'>15137</font>, <font color='#979000'>12873</font>, <font color='#979000'>10114</font>, <font color='#979000'>6967</font>, <font color='#979000'>3552</font>,
<font color='#979000'>8867</font>, <font color='#979000'>12299</font>, <font color='#979000'>11585</font>, <font color='#979000'>10426</font>, <font color='#979000'>8867</font>, <font color='#979000'>6967</font>, <font color='#979000'>4799</font>, <font color='#979000'>2446</font>,
<font color='#979000'>4520</font>, <font color='#979000'>6270</font>, <font color='#979000'>5906</font>, <font color='#979000'>5315</font>, <font color='#979000'>4520</font>, <font color='#979000'>3552</font>, <font color='#979000'>2446</font>, <font color='#979000'>1247</font>
<b>}</b>;
SHIFT_TEMPS
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[qtblno] <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <b>{</b>
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[qtblno] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>DCTELEM <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_IMAGE,
DCTSIZE2 <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>DCTELEM<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b>}</b>
dtbl <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[qtblno];
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> DCTSIZE2; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
dtbl[i] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>DCTELEM<font face='Lucida Console'>)</font>
<font color='#BB00BB'>DESCALE</font><font face='Lucida Console'>(</font><font color='#BB00BB'>MULTIPLY16V16</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>INT32<font face='Lucida Console'>)</font> qtbl<font color='#5555FF'>-</font><font color='#5555FF'>></font>quantval[i],
<font face='Lucida Console'>(</font>INT32<font face='Lucida Console'>)</font> aanscales[i]<font face='Lucida Console'>)</font>,
CONST_BITS<font color='#5555FF'>-</font><font color='#979000'>3</font><font face='Lucida Console'>)</font>;
<b>}</b>
<b>}</b>
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.forward_DCT[ci] <font color='#5555FF'>=</font> forward_DCT;
<font color='#0000FF'>break</font>;
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>#ifdef</font> DCT_FLOAT_SUPPORTED
<font color='#0000FF'>case</font> JDCT_FLOAT:
<b>{</b>
<font color='#009900'>/* For float AA&N IDCT method, divisors are equal to quantization
* coefficients scaled by scalefactor[row]*scalefactor[col], where
* scalefactor[0] = 1
* scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7
* We apply a further scale factor of 8.
* What's actually stored is 1/divisor so that the inner loop can
* use a multiplication rather than a division.
*/</font>
FAST_FLOAT <font color='#5555FF'>*</font> fdtbl;
<font color='#0000FF'><u>int</u></font> row, col;
<font color='#0000FF'>static</font> <font color='#0000FF'>const</font> <font color='#0000FF'><u>double</u></font> aanscalefactor[DCTSIZE] <font color='#5555FF'>=</font> <b>{</b>
<font color='#979000'>1.0</font>, <font color='#979000'>1.387039845</font>, <font color='#979000'>1.306562965</font>, <font color='#979000'>1.175875602</font>,
<font color='#979000'>1.0</font>, <font color='#979000'>0.785694958</font>, <font color='#979000'>0.541196100</font>, <font color='#979000'>0.275899379</font>
<b>}</b>;
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>float_divisors[qtblno] <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <b>{</b>
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>float_divisors[qtblno] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>FAST_FLOAT <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_IMAGE,
DCTSIZE2 <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>FAST_FLOAT<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
<b>}</b>
fdtbl <font color='#5555FF'>=</font> fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>float_divisors[qtblno];
i <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>row <font color='#5555FF'>=</font> <font color='#979000'>0</font>; row <font color='#5555FF'><</font> DCTSIZE; row<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>col <font color='#5555FF'>=</font> <font color='#979000'>0</font>; col <font color='#5555FF'><</font> DCTSIZE; col<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
fdtbl[i] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>FAST_FLOAT<font face='Lucida Console'>)</font>
<font face='Lucida Console'>(</font><font color='#979000'>1.0</font> <font color='#5555FF'>/</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font><font color='#0000FF'><u>double</u></font><font face='Lucida Console'>)</font> qtbl<font color='#5555FF'>-</font><font color='#5555FF'>></font>quantval[i] <font color='#5555FF'>*</font>
aanscalefactor[row] <font color='#5555FF'>*</font> aanscalefactor[col] <font color='#5555FF'>*</font> <font color='#979000'>8.0</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
i<font color='#5555FF'>+</font><font color='#5555FF'>+</font>;
<b>}</b>
<b>}</b>
<b>}</b>
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.forward_DCT[ci] <font color='#5555FF'>=</font> forward_DCT_float;
<font color='#0000FF'>break</font>;
<font color='#0000FF'>#endif</font>
<font color='#0000FF'>default</font>:
<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_NOT_COMPILED<font face='Lucida Console'>)</font>;
<font color='#0000FF'>break</font>;
<b>}</b>
<b>}</b>
<b>}</b>
<font color='#009900'>/*
* Initialize FDCT manager.
*/</font>
<b><a name='GLOBAL'></a>GLOBAL</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
<b><a name='jinit_forward_dct'></a>jinit_forward_dct</b> <font face='Lucida Console'>(</font>j_compress_ptr cinfo<font face='Lucida Console'>)</font>
<b>{</b>
my_fdct_ptr fdct;
<font color='#0000FF'><u>int</u></font> i;
fdct <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_fdct_ptr<font face='Lucida Console'>)</font>
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_IMAGE,
<font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>my_fdct_controller<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>fdct <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'>struct</font> jpeg_forward_dct <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> fdct;
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.start_pass <font color='#5555FF'>=</font> start_pass_fdctmgr;
<font color='#009900'>/* Mark divisor tables unallocated */</font>
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> NUM_QUANT_TBLS; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>divisors[i] <font color='#5555FF'>=</font> NULL;
<font color='#0000FF'>#ifdef</font> DCT_FLOAT_SUPPORTED
fdct<font color='#5555FF'>-</font><font color='#5555FF'>></font>float_divisors[i] <font color='#5555FF'>=</font> NULL;
<font color='#0000FF'>#endif</font>
<b>}</b>
<b>}</b>
</pre></body></html> |