Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jcdctmgr.c |
| 3 | * |
DRC | a73e870 | 2012-12-31 02:52:30 +0000 | [diff] [blame] | 4 | * This file was part of the Independent JPEG Group's software: |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 5 | * Copyright (C) 1994-1996, Thomas G. Lane. |
DRC | a6ef282 | 2013-09-28 03:23:49 +0000 | [diff] [blame] | 6 | * libjpeg-turbo Modifications: |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 7 | * Copyright (C) 1999-2006, MIYASAKA Masaru. |
Pierre Ossman | 59a3938 | 2009-03-09 13:15:56 +0000 | [diff] [blame] | 8 | * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB |
DRC | aee4f72 | 2014-08-09 23:06:07 +0000 | [diff] [blame] | 9 | * Copyright (C) 2011, 2014 D. R. Commander |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 10 | * For conditions of distribution and use, see the accompanying README file. |
| 11 | * |
| 12 | * This file contains the forward-DCT management logic. |
| 13 | * This code selects a particular DCT implementation to be used, |
| 14 | * and it performs related housekeeping chores including coefficient |
| 15 | * quantization. |
| 16 | */ |
| 17 | |
| 18 | #define JPEG_INTERNALS |
| 19 | #include "jinclude.h" |
| 20 | #include "jpeglib.h" |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 21 | #include "jdct.h" /* Private declarations for DCT subsystem */ |
Pierre Ossman | 59a3938 | 2009-03-09 13:15:56 +0000 | [diff] [blame] | 22 | #include "jsimddct.h" |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 23 | |
| 24 | |
| 25 | /* Private subobject for this module */ |
| 26 | |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 27 | typedef void (*forward_DCT_method_ptr) (DCTELEM * data); |
| 28 | typedef void (*float_DCT_method_ptr) (FAST_FLOAT * data); |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 29 | |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 30 | typedef void (*convsamp_method_ptr) (JSAMPARRAY sample_data, |
| 31 | JDIMENSION start_col, |
| 32 | DCTELEM * workspace); |
| 33 | typedef void (*float_convsamp_method_ptr) (JSAMPARRAY sample_data, |
| 34 | JDIMENSION start_col, |
| 35 | FAST_FLOAT *workspace); |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 36 | |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 37 | typedef void (*quantize_method_ptr) (JCOEFPTR coef_block, DCTELEM * divisors, |
| 38 | DCTELEM * workspace); |
| 39 | typedef void (*float_quantize_method_ptr) (JCOEFPTR coef_block, |
| 40 | FAST_FLOAT * divisors, |
| 41 | FAST_FLOAT * workspace); |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 42 | |
DRC | a49c4e5 | 2011-02-18 20:50:08 +0000 | [diff] [blame] | 43 | METHODDEF(void) quantize (JCOEFPTR, DCTELEM *, DCTELEM *); |
| 44 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 45 | typedef struct { |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 46 | struct jpeg_forward_dct pub; /* public fields */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 47 | |
| 48 | /* Pointer to the DCT routine actually in use */ |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 49 | forward_DCT_method_ptr dct; |
| 50 | convsamp_method_ptr convsamp; |
| 51 | quantize_method_ptr quantize; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 52 | |
| 53 | /* The actual post-DCT divisors --- not identical to the quant table |
| 54 | * entries, because of scaling (especially for an unnormalized DCT). |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 55 | * Each table is given in normal array order. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 56 | */ |
| 57 | DCTELEM * divisors[NUM_QUANT_TBLS]; |
| 58 | |
Pierre Ossman | 35c4719 | 2009-03-09 13:29:37 +0000 | [diff] [blame] | 59 | /* work area for FDCT subroutine */ |
| 60 | DCTELEM * workspace; |
| 61 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 62 | #ifdef DCT_FLOAT_SUPPORTED |
| 63 | /* Same as above for the floating-point case. */ |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 64 | float_DCT_method_ptr float_dct; |
| 65 | float_convsamp_method_ptr float_convsamp; |
| 66 | float_quantize_method_ptr float_quantize; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 67 | FAST_FLOAT * float_divisors[NUM_QUANT_TBLS]; |
Pierre Ossman | 35c4719 | 2009-03-09 13:29:37 +0000 | [diff] [blame] | 68 | FAST_FLOAT * float_workspace; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 69 | #endif |
| 70 | } my_fdct_controller; |
| 71 | |
| 72 | typedef my_fdct_controller * my_fdct_ptr; |
| 73 | |
| 74 | |
DRC | aee4f72 | 2014-08-09 23:06:07 +0000 | [diff] [blame] | 75 | #if BITS_IN_JSAMPLE == 8 |
| 76 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 77 | /* |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 78 | * Find the highest bit in an integer through binary search. |
| 79 | */ |
DRC | aee4f72 | 2014-08-09 23:06:07 +0000 | [diff] [blame] | 80 | |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 81 | LOCAL(int) |
DRC | fc5dc4f | 2009-10-01 22:26:14 +0000 | [diff] [blame] | 82 | flss (UINT16 val) |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 83 | { |
| 84 | int bit; |
| 85 | |
| 86 | bit = 16; |
| 87 | |
| 88 | if (!val) |
| 89 | return 0; |
| 90 | |
| 91 | if (!(val & 0xff00)) { |
| 92 | bit -= 8; |
| 93 | val <<= 8; |
| 94 | } |
| 95 | if (!(val & 0xf000)) { |
| 96 | bit -= 4; |
| 97 | val <<= 4; |
| 98 | } |
| 99 | if (!(val & 0xc000)) { |
| 100 | bit -= 2; |
| 101 | val <<= 2; |
| 102 | } |
| 103 | if (!(val & 0x8000)) { |
| 104 | bit -= 1; |
| 105 | val <<= 1; |
| 106 | } |
| 107 | |
| 108 | return bit; |
| 109 | } |
| 110 | |
DRC | aee4f72 | 2014-08-09 23:06:07 +0000 | [diff] [blame] | 111 | |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 112 | /* |
| 113 | * Compute values to do a division using reciprocal. |
| 114 | * |
| 115 | * This implementation is based on an algorithm described in |
| 116 | * "How to optimize for the Pentium family of microprocessors" |
| 117 | * (http://www.agner.org/assem/). |
| 118 | * More information about the basic algorithm can be found in |
| 119 | * the paper "Integer Division Using Reciprocals" by Robert Alverson. |
| 120 | * |
| 121 | * The basic idea is to replace x/d by x * d^-1. In order to store |
| 122 | * d^-1 with enough precision we shift it left a few places. It turns |
| 123 | * out that this algoright gives just enough precision, and also fits |
| 124 | * into DCTELEM: |
| 125 | * |
| 126 | * b = (the number of significant bits in divisor) - 1 |
| 127 | * r = (word size) + b |
| 128 | * f = 2^r / divisor |
| 129 | * |
| 130 | * f will not be an integer for most cases, so we need to compensate |
| 131 | * for the rounding error introduced: |
| 132 | * |
| 133 | * no fractional part: |
| 134 | * |
| 135 | * result = input >> r |
| 136 | * |
| 137 | * fractional part of f < 0.5: |
| 138 | * |
| 139 | * round f down to nearest integer |
| 140 | * result = ((input + 1) * f) >> r |
| 141 | * |
| 142 | * fractional part of f > 0.5: |
| 143 | * |
| 144 | * round f up to nearest integer |
| 145 | * result = (input * f) >> r |
| 146 | * |
| 147 | * This is the original algorithm that gives truncated results. But we |
| 148 | * want properly rounded results, so we replace "input" with |
| 149 | * "input + divisor/2". |
| 150 | * |
| 151 | * In order to allow SIMD implementations we also tweak the values to |
| 152 | * allow the same calculation to be made at all times: |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 153 | * |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 154 | * dctbl[0] = f rounded to nearest integer |
| 155 | * dctbl[1] = divisor / 2 (+ 1 if fractional part of f < 0.5) |
| 156 | * dctbl[2] = 1 << ((word size) * 2 - r) |
| 157 | * dctbl[3] = r - (word size) |
| 158 | * |
| 159 | * dctbl[2] is for stupid instruction sets where the shift operation |
| 160 | * isn't member wise (e.g. MMX). |
| 161 | * |
| 162 | * The reason dctbl[2] and dctbl[3] reduce the shift with (word size) |
| 163 | * is that most SIMD implementations have a "multiply and store top |
| 164 | * half" operation. |
| 165 | * |
| 166 | * Lastly, we store each of the values in their own table instead |
| 167 | * of in a consecutive manner, yet again in order to allow SIMD |
| 168 | * routines. |
| 169 | */ |
DRC | aee4f72 | 2014-08-09 23:06:07 +0000 | [diff] [blame] | 170 | |
DRC | a49c4e5 | 2011-02-18 20:50:08 +0000 | [diff] [blame] | 171 | LOCAL(int) |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 172 | compute_reciprocal (UINT16 divisor, DCTELEM * dtbl) |
| 173 | { |
| 174 | UDCTELEM2 fq, fr; |
| 175 | UDCTELEM c; |
| 176 | int b, r; |
| 177 | |
DRC | fc5dc4f | 2009-10-01 22:26:14 +0000 | [diff] [blame] | 178 | b = flss(divisor) - 1; |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 179 | r = sizeof(DCTELEM) * 8 + b; |
| 180 | |
| 181 | fq = ((UDCTELEM2)1 << r) / divisor; |
| 182 | fr = ((UDCTELEM2)1 << r) % divisor; |
| 183 | |
| 184 | c = divisor / 2; /* for rounding */ |
| 185 | |
| 186 | if (fr == 0) { /* divisor is power of two */ |
| 187 | /* fq will be one bit too large to fit in DCTELEM, so adjust */ |
| 188 | fq >>= 1; |
| 189 | r--; |
DRC | d65d99a | 2012-01-31 03:39:23 +0000 | [diff] [blame] | 190 | } else if (fr <= (divisor / 2U)) { /* fractional part is < 0.5 */ |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 191 | c++; |
| 192 | } else { /* fractional part is > 0.5 */ |
| 193 | fq++; |
| 194 | } |
| 195 | |
| 196 | dtbl[DCTSIZE2 * 0] = (DCTELEM) fq; /* reciprocal */ |
| 197 | dtbl[DCTSIZE2 * 1] = (DCTELEM) c; /* correction + roundfactor */ |
| 198 | dtbl[DCTSIZE2 * 2] = (DCTELEM) (1 << (sizeof(DCTELEM)*8*2 - r)); /* scale */ |
| 199 | dtbl[DCTSIZE2 * 3] = (DCTELEM) r - sizeof(DCTELEM)*8; /* shift */ |
DRC | a49c4e5 | 2011-02-18 20:50:08 +0000 | [diff] [blame] | 200 | |
| 201 | if(r <= 16) return 0; |
| 202 | else return 1; |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 203 | } |
| 204 | |
DRC | aee4f72 | 2014-08-09 23:06:07 +0000 | [diff] [blame] | 205 | #endif |
| 206 | |
| 207 | |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 208 | /* |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 209 | * Initialize for a processing pass. |
| 210 | * Verify that all referenced Q-tables are present, and set up |
| 211 | * the divisor table for each one. |
| 212 | * In the current implementation, DCT of all components is done during |
| 213 | * the first pass, even if only some components will be output in the |
| 214 | * first scan. Hence all components should be examined here. |
| 215 | */ |
| 216 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 217 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 218 | start_pass_fdctmgr (j_compress_ptr cinfo) |
| 219 | { |
| 220 | my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct; |
| 221 | int ci, qtblno, i; |
| 222 | jpeg_component_info *compptr; |
| 223 | JQUANT_TBL * qtbl; |
| 224 | DCTELEM * dtbl; |
| 225 | |
| 226 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
| 227 | ci++, compptr++) { |
| 228 | qtblno = compptr->quant_tbl_no; |
| 229 | /* Make sure specified quantization table is present */ |
| 230 | if (qtblno < 0 || qtblno >= NUM_QUANT_TBLS || |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 231 | cinfo->quant_tbl_ptrs[qtblno] == NULL) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 232 | ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, qtblno); |
| 233 | qtbl = cinfo->quant_tbl_ptrs[qtblno]; |
| 234 | /* Compute divisors for this quant table */ |
| 235 | /* We may do this more than once for same table, but it's not a big deal */ |
| 236 | switch (cinfo->dct_method) { |
| 237 | #ifdef DCT_ISLOW_SUPPORTED |
| 238 | case JDCT_ISLOW: |
| 239 | /* For LL&M IDCT method, divisors are equal to raw quantization |
| 240 | * coefficients multiplied by 8 (to counteract scaling). |
| 241 | */ |
| 242 | if (fdct->divisors[qtblno] == NULL) { |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 243 | fdct->divisors[qtblno] = (DCTELEM *) |
| 244 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame] | 245 | (DCTSIZE2 * 4) * sizeof(DCTELEM)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 246 | } |
| 247 | dtbl = fdct->divisors[qtblno]; |
| 248 | for (i = 0; i < DCTSIZE2; i++) { |
DRC | aee4f72 | 2014-08-09 23:06:07 +0000 | [diff] [blame] | 249 | #if BITS_IN_JSAMPLE == 8 |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 250 | if(!compute_reciprocal(qtbl->quantval[i] << 3, &dtbl[i]) |
| 251 | && fdct->quantize == jsimd_quantize) |
| 252 | fdct->quantize = quantize; |
DRC | aee4f72 | 2014-08-09 23:06:07 +0000 | [diff] [blame] | 253 | #else |
| 254 | dtbl[i] = ((DCTELEM) qtbl->quantval[i]) << 3; |
| 255 | #endif |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 256 | } |
| 257 | break; |
| 258 | #endif |
| 259 | #ifdef DCT_IFAST_SUPPORTED |
| 260 | case JDCT_IFAST: |
| 261 | { |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 262 | /* For AA&N IDCT method, divisors are equal to quantization |
| 263 | * coefficients scaled by scalefactor[row]*scalefactor[col], where |
| 264 | * scalefactor[0] = 1 |
| 265 | * scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7 |
| 266 | * We apply a further scale factor of 8. |
| 267 | */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 268 | #define CONST_BITS 14 |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 269 | static const INT16 aanscales[DCTSIZE2] = { |
| 270 | /* precomputed values scaled up by 14 bits */ |
| 271 | 16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520, |
| 272 | 22725, 31521, 29692, 26722, 22725, 17855, 12299, 6270, |
| 273 | 21407, 29692, 27969, 25172, 21407, 16819, 11585, 5906, |
| 274 | 19266, 26722, 25172, 22654, 19266, 15137, 10426, 5315, |
| 275 | 16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520, |
| 276 | 12873, 17855, 16819, 15137, 12873, 10114, 6967, 3552, |
| 277 | 8867, 12299, 11585, 10426, 8867, 6967, 4799, 2446, |
| 278 | 4520, 6270, 5906, 5315, 4520, 3552, 2446, 1247 |
| 279 | }; |
| 280 | SHIFT_TEMPS |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 281 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 282 | if (fdct->divisors[qtblno] == NULL) { |
| 283 | fdct->divisors[qtblno] = (DCTELEM *) |
| 284 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame] | 285 | (DCTSIZE2 * 4) * sizeof(DCTELEM)); |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 286 | } |
| 287 | dtbl = fdct->divisors[qtblno]; |
| 288 | for (i = 0; i < DCTSIZE2; i++) { |
DRC | aee4f72 | 2014-08-09 23:06:07 +0000 | [diff] [blame] | 289 | #if BITS_IN_JSAMPLE == 8 |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 290 | if(!compute_reciprocal( |
| 291 | DESCALE(MULTIPLY16V16((INT32) qtbl->quantval[i], |
| 292 | (INT32) aanscales[i]), |
| 293 | CONST_BITS-3), &dtbl[i]) |
| 294 | && fdct->quantize == jsimd_quantize) |
| 295 | fdct->quantize = quantize; |
DRC | aee4f72 | 2014-08-09 23:06:07 +0000 | [diff] [blame] | 296 | #else |
| 297 | dtbl[i] = (DCTELEM) |
| 298 | DESCALE(MULTIPLY16V16((INT32) qtbl->quantval[i], |
| 299 | (INT32) aanscales[i]), |
| 300 | CONST_BITS-3); |
| 301 | #endif |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 302 | } |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 303 | } |
| 304 | break; |
| 305 | #endif |
| 306 | #ifdef DCT_FLOAT_SUPPORTED |
| 307 | case JDCT_FLOAT: |
| 308 | { |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 309 | /* For float AA&N IDCT method, divisors are equal to quantization |
| 310 | * coefficients scaled by scalefactor[row]*scalefactor[col], where |
| 311 | * scalefactor[0] = 1 |
| 312 | * scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7 |
| 313 | * We apply a further scale factor of 8. |
| 314 | * What's actually stored is 1/divisor so that the inner loop can |
| 315 | * use a multiplication rather than a division. |
| 316 | */ |
| 317 | FAST_FLOAT * fdtbl; |
| 318 | int row, col; |
| 319 | static const double aanscalefactor[DCTSIZE] = { |
| 320 | 1.0, 1.387039845, 1.306562965, 1.175875602, |
| 321 | 1.0, 0.785694958, 0.541196100, 0.275899379 |
| 322 | }; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 323 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 324 | if (fdct->float_divisors[qtblno] == NULL) { |
| 325 | fdct->float_divisors[qtblno] = (FAST_FLOAT *) |
| 326 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame] | 327 | DCTSIZE2 * sizeof(FAST_FLOAT)); |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 328 | } |
| 329 | fdtbl = fdct->float_divisors[qtblno]; |
| 330 | i = 0; |
| 331 | for (row = 0; row < DCTSIZE; row++) { |
| 332 | for (col = 0; col < DCTSIZE; col++) { |
| 333 | fdtbl[i] = (FAST_FLOAT) |
| 334 | (1.0 / (((double) qtbl->quantval[i] * |
| 335 | aanscalefactor[row] * aanscalefactor[col] * 8.0))); |
| 336 | i++; |
| 337 | } |
| 338 | } |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 339 | } |
| 340 | break; |
| 341 | #endif |
| 342 | default: |
| 343 | ERREXIT(cinfo, JERR_NOT_COMPILED); |
| 344 | break; |
| 345 | } |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | |
| 350 | /* |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 351 | * Load data into workspace, applying unsigned->signed conversion. |
| 352 | */ |
| 353 | |
| 354 | METHODDEF(void) |
| 355 | convsamp (JSAMPARRAY sample_data, JDIMENSION start_col, DCTELEM * workspace) |
| 356 | { |
| 357 | register DCTELEM *workspaceptr; |
| 358 | register JSAMPROW elemptr; |
| 359 | register int elemr; |
| 360 | |
| 361 | workspaceptr = workspace; |
| 362 | for (elemr = 0; elemr < DCTSIZE; elemr++) { |
| 363 | elemptr = sample_data[elemr] + start_col; |
| 364 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 365 | #if DCTSIZE == 8 /* unroll the inner loop */ |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 366 | *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE; |
| 367 | *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE; |
| 368 | *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE; |
| 369 | *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE; |
| 370 | *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE; |
| 371 | *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE; |
| 372 | *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE; |
| 373 | *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE; |
| 374 | #else |
| 375 | { |
| 376 | register int elemc; |
| 377 | for (elemc = DCTSIZE; elemc > 0; elemc--) |
| 378 | *workspaceptr++ = GETJSAMPLE(*elemptr++) - CENTERJSAMPLE; |
| 379 | } |
| 380 | #endif |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | |
| 385 | /* |
| 386 | * Quantize/descale the coefficients, and store into coef_blocks[]. |
| 387 | */ |
| 388 | |
| 389 | METHODDEF(void) |
| 390 | quantize (JCOEFPTR coef_block, DCTELEM * divisors, DCTELEM * workspace) |
| 391 | { |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 392 | int i; |
| 393 | DCTELEM temp; |
DRC | aee4f72 | 2014-08-09 23:06:07 +0000 | [diff] [blame] | 394 | JCOEFPTR output_ptr = coef_block; |
| 395 | |
| 396 | #if BITS_IN_JSAMPLE == 8 |
| 397 | |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 398 | UDCTELEM recip, corr, shift; |
| 399 | UDCTELEM2 product; |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 400 | |
| 401 | for (i = 0; i < DCTSIZE2; i++) { |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 402 | temp = workspace[i]; |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 403 | recip = divisors[i + DCTSIZE2 * 0]; |
| 404 | corr = divisors[i + DCTSIZE2 * 1]; |
| 405 | shift = divisors[i + DCTSIZE2 * 3]; |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 406 | |
| 407 | if (temp < 0) { |
| 408 | temp = -temp; |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 409 | product = (UDCTELEM2)(temp + corr) * recip; |
| 410 | product >>= shift + sizeof(DCTELEM)*8; |
| 411 | temp = product; |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 412 | temp = -temp; |
| 413 | } else { |
Pierre Ossman | dedc42e | 2009-03-09 13:23:04 +0000 | [diff] [blame] | 414 | product = (UDCTELEM2)(temp + corr) * recip; |
| 415 | product >>= shift + sizeof(DCTELEM)*8; |
| 416 | temp = product; |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 417 | } |
| 418 | output_ptr[i] = (JCOEF) temp; |
| 419 | } |
DRC | aee4f72 | 2014-08-09 23:06:07 +0000 | [diff] [blame] | 420 | |
| 421 | #else |
| 422 | |
| 423 | register DCTELEM qval; |
| 424 | |
| 425 | for (i = 0; i < DCTSIZE2; i++) { |
| 426 | qval = divisors[i]; |
| 427 | temp = workspace[i]; |
| 428 | /* Divide the coefficient value by qval, ensuring proper rounding. |
| 429 | * Since C does not specify the direction of rounding for negative |
| 430 | * quotients, we have to force the dividend positive for portability. |
| 431 | * |
| 432 | * In most files, at least half of the output values will be zero |
| 433 | * (at default quantization settings, more like three-quarters...) |
| 434 | * so we should ensure that this case is fast. On many machines, |
| 435 | * a comparison is enough cheaper than a divide to make a special test |
| 436 | * a win. Since both inputs will be nonnegative, we need only test |
| 437 | * for a < b to discover whether a/b is 0. |
| 438 | * If your machine's division is fast enough, define FAST_DIVIDE. |
| 439 | */ |
| 440 | #ifdef FAST_DIVIDE |
| 441 | #define DIVIDE_BY(a,b) a /= b |
| 442 | #else |
| 443 | #define DIVIDE_BY(a,b) if (a >= b) a /= b; else a = 0 |
| 444 | #endif |
| 445 | if (temp < 0) { |
| 446 | temp = -temp; |
| 447 | temp += qval>>1; /* for rounding */ |
| 448 | DIVIDE_BY(temp, qval); |
DRC | eca0637 | 2014-11-06 09:32:38 +0000 | [diff] [blame^] | 449 | temp = -temp; |
DRC | aee4f72 | 2014-08-09 23:06:07 +0000 | [diff] [blame] | 450 | } else { |
| 451 | temp += qval>>1; /* for rounding */ |
| 452 | DIVIDE_BY(temp, qval); |
| 453 | } |
| 454 | output_ptr[i] = (JCOEF) temp; |
| 455 | } |
| 456 | |
| 457 | #endif |
| 458 | |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 459 | } |
| 460 | |
| 461 | |
| 462 | /* |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 463 | * Perform forward DCT on one or more blocks of a component. |
| 464 | * |
| 465 | * The input samples are taken from the sample_data[] array starting at |
| 466 | * position start_row/start_col, and moving to the right for any additional |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 467 | * blocks. The quantized coefficients are returned in coef_blocks[]. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 468 | */ |
| 469 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 470 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 471 | forward_DCT (j_compress_ptr cinfo, jpeg_component_info * compptr, |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 472 | JSAMPARRAY sample_data, JBLOCKROW coef_blocks, |
| 473 | JDIMENSION start_row, JDIMENSION start_col, |
| 474 | JDIMENSION num_blocks) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 475 | /* This version is used for integer DCT implementations. */ |
| 476 | { |
| 477 | /* This routine is heavily used, so it's worth coding it tightly. */ |
| 478 | my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 479 | DCTELEM * divisors = fdct->divisors[compptr->quant_tbl_no]; |
Pierre Ossman | 35c4719 | 2009-03-09 13:29:37 +0000 | [diff] [blame] | 480 | DCTELEM * workspace; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 481 | JDIMENSION bi; |
| 482 | |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 483 | /* Make sure the compiler doesn't look up these every pass */ |
| 484 | forward_DCT_method_ptr do_dct = fdct->dct; |
| 485 | convsamp_method_ptr do_convsamp = fdct->convsamp; |
| 486 | quantize_method_ptr do_quantize = fdct->quantize; |
Pierre Ossman | dc5db14 | 2009-03-13 12:17:26 +0000 | [diff] [blame] | 487 | workspace = fdct->workspace; |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 488 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 489 | sample_data += start_row; /* fold in the vertical offset once */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 490 | |
| 491 | for (bi = 0; bi < num_blocks; bi++, start_col += DCTSIZE) { |
| 492 | /* Load data into workspace, applying unsigned->signed conversion */ |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 493 | (*do_convsamp) (sample_data, start_col, workspace); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 494 | |
| 495 | /* Perform the DCT */ |
| 496 | (*do_dct) (workspace); |
| 497 | |
| 498 | /* Quantize/descale the coefficients, and store into coef_blocks[] */ |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 499 | (*do_quantize) (coef_blocks[bi], divisors, workspace); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 500 | } |
| 501 | } |
| 502 | |
| 503 | |
| 504 | #ifdef DCT_FLOAT_SUPPORTED |
| 505 | |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 506 | |
| 507 | METHODDEF(void) |
| 508 | convsamp_float (JSAMPARRAY sample_data, JDIMENSION start_col, FAST_FLOAT * workspace) |
| 509 | { |
| 510 | register FAST_FLOAT *workspaceptr; |
| 511 | register JSAMPROW elemptr; |
| 512 | register int elemr; |
| 513 | |
| 514 | workspaceptr = workspace; |
| 515 | for (elemr = 0; elemr < DCTSIZE; elemr++) { |
| 516 | elemptr = sample_data[elemr] + start_col; |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 517 | #if DCTSIZE == 8 /* unroll the inner loop */ |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 518 | *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE); |
| 519 | *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE); |
| 520 | *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE); |
| 521 | *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE); |
| 522 | *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE); |
| 523 | *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE); |
| 524 | *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE); |
| 525 | *workspaceptr++ = (FAST_FLOAT)(GETJSAMPLE(*elemptr++) - CENTERJSAMPLE); |
| 526 | #else |
| 527 | { |
| 528 | register int elemc; |
| 529 | for (elemc = DCTSIZE; elemc > 0; elemc--) |
| 530 | *workspaceptr++ = (FAST_FLOAT) |
| 531 | (GETJSAMPLE(*elemptr++) - CENTERJSAMPLE); |
| 532 | } |
| 533 | #endif |
| 534 | } |
| 535 | } |
| 536 | |
| 537 | |
| 538 | METHODDEF(void) |
| 539 | quantize_float (JCOEFPTR coef_block, FAST_FLOAT * divisors, FAST_FLOAT * workspace) |
| 540 | { |
| 541 | register FAST_FLOAT temp; |
| 542 | register int i; |
| 543 | register JCOEFPTR output_ptr = coef_block; |
| 544 | |
| 545 | for (i = 0; i < DCTSIZE2; i++) { |
| 546 | /* Apply the quantization and scaling factor */ |
| 547 | temp = workspace[i] * divisors[i]; |
| 548 | |
| 549 | /* Round to nearest integer. |
| 550 | * Since C does not specify the direction of rounding for negative |
| 551 | * quotients, we have to force the dividend positive for portability. |
| 552 | * The maximum coefficient size is +-16K (for 12-bit data), so this |
| 553 | * code should work for either 16-bit or 32-bit ints. |
| 554 | */ |
| 555 | output_ptr[i] = (JCOEF) ((int) (temp + (FAST_FLOAT) 16384.5) - 16384); |
| 556 | } |
| 557 | } |
| 558 | |
| 559 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 560 | METHODDEF(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 561 | forward_DCT_float (j_compress_ptr cinfo, jpeg_component_info * compptr, |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 562 | JSAMPARRAY sample_data, JBLOCKROW coef_blocks, |
| 563 | JDIMENSION start_row, JDIMENSION start_col, |
| 564 | JDIMENSION num_blocks) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 565 | /* This version is used for floating-point DCT implementations. */ |
| 566 | { |
| 567 | /* This routine is heavily used, so it's worth coding it tightly. */ |
| 568 | my_fdct_ptr fdct = (my_fdct_ptr) cinfo->fdct; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 569 | FAST_FLOAT * divisors = fdct->float_divisors[compptr->quant_tbl_no]; |
Pierre Ossman | 35c4719 | 2009-03-09 13:29:37 +0000 | [diff] [blame] | 570 | FAST_FLOAT * workspace; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 571 | JDIMENSION bi; |
| 572 | |
Pierre Ossman | 35c4719 | 2009-03-09 13:29:37 +0000 | [diff] [blame] | 573 | |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 574 | /* Make sure the compiler doesn't look up these every pass */ |
| 575 | float_DCT_method_ptr do_dct = fdct->float_dct; |
| 576 | float_convsamp_method_ptr do_convsamp = fdct->float_convsamp; |
| 577 | float_quantize_method_ptr do_quantize = fdct->float_quantize; |
Pierre Ossman | dc5db14 | 2009-03-13 12:17:26 +0000 | [diff] [blame] | 578 | workspace = fdct->float_workspace; |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 579 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 580 | sample_data += start_row; /* fold in the vertical offset once */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 581 | |
| 582 | for (bi = 0; bi < num_blocks; bi++, start_col += DCTSIZE) { |
| 583 | /* Load data into workspace, applying unsigned->signed conversion */ |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 584 | (*do_convsamp) (sample_data, start_col, workspace); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 585 | |
| 586 | /* Perform the DCT */ |
| 587 | (*do_dct) (workspace); |
| 588 | |
| 589 | /* Quantize/descale the coefficients, and store into coef_blocks[] */ |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 590 | (*do_quantize) (coef_blocks[bi], divisors, workspace); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 591 | } |
| 592 | } |
| 593 | |
| 594 | #endif /* DCT_FLOAT_SUPPORTED */ |
| 595 | |
| 596 | |
| 597 | /* |
| 598 | * Initialize FDCT manager. |
| 599 | */ |
| 600 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 601 | GLOBAL(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 602 | jinit_forward_dct (j_compress_ptr cinfo) |
| 603 | { |
| 604 | my_fdct_ptr fdct; |
| 605 | int i; |
| 606 | |
| 607 | fdct = (my_fdct_ptr) |
| 608 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame] | 609 | sizeof(my_fdct_controller)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 610 | cinfo->fdct = (struct jpeg_forward_dct *) fdct; |
| 611 | fdct->pub.start_pass = start_pass_fdctmgr; |
| 612 | |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 613 | /* First determine the DCT... */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 614 | switch (cinfo->dct_method) { |
| 615 | #ifdef DCT_ISLOW_SUPPORTED |
| 616 | case JDCT_ISLOW: |
| 617 | fdct->pub.forward_DCT = forward_DCT; |
Pierre Ossman | 59a3938 | 2009-03-09 13:15:56 +0000 | [diff] [blame] | 618 | if (jsimd_can_fdct_islow()) |
| 619 | fdct->dct = jsimd_fdct_islow; |
| 620 | else |
| 621 | fdct->dct = jpeg_fdct_islow; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 622 | break; |
| 623 | #endif |
| 624 | #ifdef DCT_IFAST_SUPPORTED |
| 625 | case JDCT_IFAST: |
| 626 | fdct->pub.forward_DCT = forward_DCT; |
Pierre Ossman | 59a3938 | 2009-03-09 13:15:56 +0000 | [diff] [blame] | 627 | if (jsimd_can_fdct_ifast()) |
| 628 | fdct->dct = jsimd_fdct_ifast; |
| 629 | else |
| 630 | fdct->dct = jpeg_fdct_ifast; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 631 | break; |
| 632 | #endif |
| 633 | #ifdef DCT_FLOAT_SUPPORTED |
| 634 | case JDCT_FLOAT: |
| 635 | fdct->pub.forward_DCT = forward_DCT_float; |
Pierre Ossman | 59a3938 | 2009-03-09 13:15:56 +0000 | [diff] [blame] | 636 | if (jsimd_can_fdct_float()) |
| 637 | fdct->float_dct = jsimd_fdct_float; |
| 638 | else |
| 639 | fdct->float_dct = jpeg_fdct_float; |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 640 | break; |
| 641 | #endif |
| 642 | default: |
| 643 | ERREXIT(cinfo, JERR_NOT_COMPILED); |
| 644 | break; |
| 645 | } |
| 646 | |
| 647 | /* ...then the supporting stages. */ |
| 648 | switch (cinfo->dct_method) { |
| 649 | #ifdef DCT_ISLOW_SUPPORTED |
| 650 | case JDCT_ISLOW: |
| 651 | #endif |
| 652 | #ifdef DCT_IFAST_SUPPORTED |
| 653 | case JDCT_IFAST: |
| 654 | #endif |
| 655 | #if defined(DCT_ISLOW_SUPPORTED) || defined(DCT_IFAST_SUPPORTED) |
Pierre Ossman | 59a3938 | 2009-03-09 13:15:56 +0000 | [diff] [blame] | 656 | if (jsimd_can_convsamp()) |
| 657 | fdct->convsamp = jsimd_convsamp; |
| 658 | else |
| 659 | fdct->convsamp = convsamp; |
| 660 | if (jsimd_can_quantize()) |
| 661 | fdct->quantize = jsimd_quantize; |
| 662 | else |
| 663 | fdct->quantize = quantize; |
Pierre Ossman | 49dcbfb | 2009-03-09 10:37:20 +0000 | [diff] [blame] | 664 | break; |
| 665 | #endif |
| 666 | #ifdef DCT_FLOAT_SUPPORTED |
| 667 | case JDCT_FLOAT: |
Pierre Ossman | 59a3938 | 2009-03-09 13:15:56 +0000 | [diff] [blame] | 668 | if (jsimd_can_convsamp_float()) |
| 669 | fdct->float_convsamp = jsimd_convsamp_float; |
| 670 | else |
| 671 | fdct->float_convsamp = convsamp_float; |
| 672 | if (jsimd_can_quantize_float()) |
| 673 | fdct->float_quantize = jsimd_quantize_float; |
| 674 | else |
| 675 | fdct->float_quantize = quantize_float; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 676 | break; |
| 677 | #endif |
| 678 | default: |
| 679 | ERREXIT(cinfo, JERR_NOT_COMPILED); |
| 680 | break; |
| 681 | } |
| 682 | |
Pierre Ossman | 35c4719 | 2009-03-09 13:29:37 +0000 | [diff] [blame] | 683 | /* Allocate workspace memory */ |
| 684 | #ifdef DCT_FLOAT_SUPPORTED |
| 685 | if (cinfo->dct_method == JDCT_FLOAT) |
| 686 | fdct->float_workspace = (FAST_FLOAT *) |
| 687 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame] | 688 | sizeof(FAST_FLOAT) * DCTSIZE2); |
Pierre Ossman | 35c4719 | 2009-03-09 13:29:37 +0000 | [diff] [blame] | 689 | else |
| 690 | #endif |
| 691 | fdct->workspace = (DCTELEM *) |
| 692 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame] | 693 | sizeof(DCTELEM) * DCTSIZE2); |
Pierre Ossman | 35c4719 | 2009-03-09 13:29:37 +0000 | [diff] [blame] | 694 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 695 | /* Mark divisor tables unallocated */ |
| 696 | for (i = 0; i < NUM_QUANT_TBLS; i++) { |
| 697 | fdct->divisors[i] = NULL; |
| 698 | #ifdef DCT_FLOAT_SUPPORTED |
| 699 | fdct->float_divisors[i] = NULL; |
| 700 | #endif |
| 701 | } |
| 702 | } |