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jcparam.c File Reference
#include "jinclude.h"
#include "jpeglib.h"
Include dependency graph for jcparam.c:

Go to the source code of this file.

Macros

#define JPEG_INTERNALS
 
#define SET_COMP(index, id, hsamp, vsamp, quant, dctbl, actbl)
 

Functions

 jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl, const unsigned int *basic_table, int scale_factor, boolean force_baseline)
 
 jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
 
 jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor, boolean force_baseline)
 
 jpeg_quality_scaling (int quality)
 
 jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline)
 
 std_huff_tables (j_compress_ptr cinfo)
 
 jpeg_set_defaults (j_compress_ptr cinfo)
 
 jpeg_default_colorspace (j_compress_ptr cinfo)
 
 jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace)
 

Variables

static const unsigned int std_luminance_quant_tbl [DCTSIZE2]
 
static const unsigned int std_chrominance_quant_tbl [DCTSIZE2]
 

Macro Definition Documentation

◆ JPEG_INTERNALS

#define JPEG_INTERNALS

Definition at line 14 of file jcparam.c.

◆ SET_COMP

#define SET_COMP (   index,
  id,
  hsamp,
  vsamp,
  quant,
  dctbl,
  actbl 
)
Value:
(compptr = &cinfo->comp_info[index], \
compptr->h_samp_factor = (hsamp), \
compptr->v_samp_factor = (vsamp), \
compptr->quant_tbl_no = (quant), \
compptr->dc_tbl_no = (dctbl), \
compptr->ac_tbl_no = (actbl) )
#define index(s, c)
Definition: various.h:29
GLuint id
Definition: glext.h:5910
jpeg_component_info * compptr
Definition: jdct.h:238

Function Documentation

◆ jpeg_add_quant_table()

jpeg_add_quant_table ( j_compress_ptr  cinfo,
int  which_tbl,
const unsigned int basic_table,
int  scale_factor,
boolean  force_baseline 
)

Definition at line 24 of file jcparam.c.

32{
33 JQUANT_TBL ** qtblptr;
34 int i;
35 long temp;
36
37 /* Safety check to ensure start_compress not called yet. */
38 if (cinfo->global_state != CSTATE_START)
39 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
40
41 if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS)
42 ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl);
43
44 qtblptr = & cinfo->quant_tbl_ptrs[which_tbl];
45
46 if (*qtblptr == NULL)
47 *qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo);
48
49 for (i = 0; i < DCTSIZE2; i++) {
50 temp = ((long) basic_table[i] * scale_factor + 50L) / 100L;
51 /* limit the values to the valid range */
52 if (temp <= 0L) temp = 1L;
53 if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */
54 if (force_baseline && temp > 255L)
55 temp = 255L; /* limit to baseline range if requested */
56 (*qtblptr)->quantval[i] = (UINT16) temp;
57 }
58
59 /* Initialize sent_table FALSE so table will be written to JPEG file. */
60 (*qtblptr)->sent_table = FALSE;
61}
unsigned short UINT16
char boolean force_baseline
Definition: cdjpeg.h:137
#define NULL
Definition: types.h:112
#define FALSE
Definition: types.h:117
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
jpeg_alloc_quant_table(j_common_ptr cinfo)
Definition: jcomapi.c:87
#define ERREXIT1(cinfo, code, p1)
Definition: jerror.h:212
#define CSTATE_START
Definition: jpegint.h:26
int const unsigned int * basic_table
Definition: jpeglib.h:1000
int scale_factor
Definition: jpeglib.h:995
#define NUM_QUANT_TBLS
Definition: jpeglib.h:52
int which_tbl
Definition: jpeglib.h:999
#define DCTSIZE2
Definition: jpeglib.h:51
#define L(x)
Definition: ntvdm.h:50
#define long
Definition: qsort.c:33
static calc_node_t temp
Definition: rpn_ieee.c:38
JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]
Definition: jpeglib.h:336

Referenced by jpeg_default_qtables(), jpeg_set_linear_quality(), and read_quant_tables().

◆ jpeg_default_colorspace()

jpeg_default_colorspace ( j_compress_ptr  cinfo)

Definition at line 297 of file jcparam.c.

298{
299 switch (cinfo->in_color_space) {
300 case JCS_UNKNOWN:
302 break;
303 case JCS_GRAYSCALE:
305 break;
306 case JCS_RGB:
308 break;
309 case JCS_YCbCr:
311 break;
312 case JCS_CMYK:
313 jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */
314 break;
315 case JCS_YCCK:
317 break;
318 case JCS_BG_RGB:
319 /* No translation for now -- conversion to BG_YCC not yet supportet */
321 break;
322 case JCS_BG_YCC:
324 break;
325 default:
326 ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
327 }
328}
jpeg_set_colorspace(j_compress_ptr cinfo, J_COLOR_SPACE colorspace)
Definition: jcparam.c:336
@ JCS_YCCK
Definition: jpeglib.h:226
@ JCS_BG_RGB
Definition: jpeglib.h:227
@ JCS_BG_YCC
Definition: jpeglib.h:228
@ JCS_UNKNOWN
Definition: jpeglib.h:221
@ JCS_YCbCr
Definition: jpeglib.h:224
@ JCS_CMYK
Definition: jpeglib.h:225
@ JCS_GRAYSCALE
Definition: jpeglib.h:222
@ JCS_RGB
Definition: jpeglib.h:223
#define ERREXIT(msg)
Definition: rdjpgcom.c:72
J_COLOR_SPACE in_color_space
Definition: jpeglib.h:305

Referenced by jpeg_set_defaults(), and main().

◆ jpeg_default_qtables()

jpeg_default_qtables ( j_compress_ptr  cinfo,
boolean  force_baseline 
)

Definition at line 91 of file jcparam.c.

96{
97 /* Set up two quantization tables using the specified scaling */
101 cinfo->q_scale_factor[1], force_baseline);
102}
static const unsigned int std_luminance_quant_tbl[DCTSIZE2]
Definition: jcparam.c:68
jpeg_add_quant_table(j_compress_ptr cinfo, int which_tbl, const unsigned int *basic_table, int scale_factor, boolean force_baseline)
Definition: jcparam.c:24
static const unsigned int std_chrominance_quant_tbl[DCTSIZE2]
Definition: jcparam.c:78
int q_scale_factor[NUM_QUANT_TBLS]
Definition: jpeglib.h:337

Referenced by set_quality_ratings().

◆ jpeg_quality_scaling()

jpeg_quality_scaling ( int  quality)

Definition at line 123 of file jcparam.c.

128{
129 /* Safety limit on quality factor. Convert 0 to 1 to avoid zero divide. */
130 if (quality <= 0) quality = 1;
131 if (quality > 100) quality = 100;
132
133 /* The basic table is used as-is (scaling 100) for a quality of 50.
134 * Qualities 50..100 are converted to scaling percentage 200 - 2*Q;
135 * note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table
136 * to make all the table entries 1 (hence, minimum quantization loss).
137 * Qualities 1..50 are converted to scaling percentage 5000/Q.
138 */
139 if (quality < 50)
140 quality = 5000 / quality;
141 else
142 quality = 200 - quality*2;
143
144 return quality;
145}
int quality
Definition: jpeglib.h:992

Referenced by jpeg_set_quality(), and set_quality_ratings().

◆ jpeg_set_colorspace()

jpeg_set_colorspace ( j_compress_ptr  cinfo,
J_COLOR_SPACE  colorspace 
)

Definition at line 336 of file jcparam.c.

337{
339 int ci;
340
341#define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl) \
342 (compptr = &cinfo->comp_info[index], \
343 compptr->component_id = (id), \
344 compptr->h_samp_factor = (hsamp), \
345 compptr->v_samp_factor = (vsamp), \
346 compptr->quant_tbl_no = (quant), \
347 compptr->dc_tbl_no = (dctbl), \
348 compptr->ac_tbl_no = (actbl) )
349
350 /* Safety check to ensure start_compress not called yet. */
351 if (cinfo->global_state != CSTATE_START)
352 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
353
354 /* For all colorspaces, we use Q and Huff tables 0 for luminance components,
355 * tables 1 for chrominance components.
356 */
357
359
360 cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */
361 cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */
362
363 switch (colorspace) {
364 case JCS_UNKNOWN:
365 cinfo->num_components = cinfo->input_components;
366 if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS)
367 ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
369 for (ci = 0; ci < cinfo->num_components; ci++) {
370 SET_COMP(ci, ci, 1,1, 0, 0,0);
371 }
372 break;
373 case JCS_GRAYSCALE:
374 cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
375 cinfo->num_components = 1;
376 /* JFIF specifies component ID 1 */
377 SET_COMP(0, 0x01, 1,1, 0, 0,0);
378 break;
379 case JCS_RGB:
380 cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */
381 cinfo->num_components = 3;
382 SET_COMP(0, 0x52 /* 'R' */, 1,1, 0,
383 cinfo->color_transform == JCT_SUBTRACT_GREEN ? 1 : 0,
384 cinfo->color_transform == JCT_SUBTRACT_GREEN ? 1 : 0);
385 SET_COMP(1, 0x47 /* 'G' */, 1,1, 0, 0,0);
386 SET_COMP(2, 0x42 /* 'B' */, 1,1, 0,
387 cinfo->color_transform == JCT_SUBTRACT_GREEN ? 1 : 0,
388 cinfo->color_transform == JCT_SUBTRACT_GREEN ? 1 : 0);
389 break;
390 case JCS_YCbCr:
391 cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
392 cinfo->num_components = 3;
393 /* JFIF specifies component IDs 1,2,3 */
394 /* We default to 2x2 subsamples of chrominance */
395 SET_COMP(0, 0x01, 2,2, 0, 0,0);
396 SET_COMP(1, 0x02, 1,1, 1, 1,1);
397 SET_COMP(2, 0x03, 1,1, 1, 1,1);
398 break;
399 case JCS_CMYK:
400 cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */
401 cinfo->num_components = 4;
402 SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0);
403 SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0);
404 SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0);
405 SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0);
406 break;
407 case JCS_YCCK:
408 cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */
409 cinfo->num_components = 4;
410 SET_COMP(0, 0x01, 2,2, 0, 0,0);
411 SET_COMP(1, 0x02, 1,1, 1, 1,1);
412 SET_COMP(2, 0x03, 1,1, 1, 1,1);
413 SET_COMP(3, 0x04, 2,2, 0, 0,0);
414 break;
415 case JCS_BG_RGB:
416 cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
417 cinfo->JFIF_major_version = 2; /* Set JFIF major version = 2 */
418 cinfo->num_components = 3;
419 /* Add offset 0x20 to the normal R/G/B component IDs */
420 SET_COMP(0, 0x72 /* 'r' */, 1,1, 0,
421 cinfo->color_transform == JCT_SUBTRACT_GREEN ? 1 : 0,
422 cinfo->color_transform == JCT_SUBTRACT_GREEN ? 1 : 0);
423 SET_COMP(1, 0x67 /* 'g' */, 1,1, 0, 0,0);
424 SET_COMP(2, 0x62 /* 'b' */, 1,1, 0,
425 cinfo->color_transform == JCT_SUBTRACT_GREEN ? 1 : 0,
426 cinfo->color_transform == JCT_SUBTRACT_GREEN ? 1 : 0);
427 break;
428 case JCS_BG_YCC:
429 cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
430 cinfo->JFIF_major_version = 2; /* Set JFIF major version = 2 */
431 cinfo->num_components = 3;
432 /* Add offset 0x20 to the normal Cb/Cr component IDs */
433 /* We default to 2x2 subsamples of chrominance */
434 SET_COMP(0, 0x01, 2,2, 0, 0,0);
435 SET_COMP(1, 0x22, 1,1, 1, 1,1);
436 SET_COMP(2, 0x23, 1,1, 1, 1,1);
437 break;
438 default:
439 ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
440 }
441}
#define TRUE
Definition: types.h:120
#define SET_COMP(index, id, hsamp, vsamp, quant, dctbl, actbl)
#define ERREXIT2(cinfo, code, p1, p2)
Definition: jerror.h:216
#define MAX_COMPONENTS
Definition: jmorecfg.h:45
@ JCT_SUBTRACT_GREEN
Definition: jpeglib.h:235
J_COLOR_SPACE colorspace
Definition: jpeglib.h:990
boolean write_JFIF_header
Definition: jpeglib.h:375
J_COLOR_TRANSFORM color_transform
Definition: jpeglib.h:387
boolean write_Adobe_marker
Definition: jpeglib.h:385
J_COLOR_SPACE jpeg_color_space
Definition: jpeglib.h:331
UINT8 JFIF_major_version
Definition: jpeglib.h:376

Referenced by jpeg_copy_critical_parameters(), jpeg_default_colorspace(), and parse_switches().

◆ jpeg_set_defaults()

jpeg_set_defaults ( j_compress_ptr  cinfo)

Definition at line 196 of file jcparam.c.

197{
198 int i;
199
200 /* Safety check to ensure start_compress not called yet. */
201 if (cinfo->global_state != CSTATE_START)
202 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
203
204 /* Allocate comp_info array large enough for maximum component count.
205 * Array is made permanent in case application wants to compress
206 * multiple images at same param settings.
207 */
208 if (cinfo->comp_info == NULL)
209 cinfo->comp_info = (jpeg_component_info *)
210 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
212
213 /* Initialize everything not dependent on the color space */
214
215 cinfo->scale_num = 1; /* 1:1 scaling */
216 cinfo->scale_denom = 1;
218 /* Set up two quantization tables using default quality of 75 */
219 jpeg_set_quality(cinfo, 75, TRUE);
220 /* Reset standard Huffman tables */
221 std_huff_tables(cinfo);
222
223 /* Initialize default arithmetic coding conditioning */
224 for (i = 0; i < NUM_ARITH_TBLS; i++) {
225 cinfo->arith_dc_L[i] = 0;
226 cinfo->arith_dc_U[i] = 1;
227 cinfo->arith_ac_K[i] = 5;
228 }
229
230 /* Default is no multiple-scan output */
231 cinfo->scan_info = NULL;
232 cinfo->num_scans = 0;
233
234 /* Expect normal source image, not raw downsampled data */
235 cinfo->raw_data_in = FALSE;
236
237 /* The standard Huffman tables are only valid for 8-bit data precision.
238 * If the precision is higher, use arithmetic coding.
239 * (Alternatively, using Huffman coding would be possible with forcing
240 * optimization on so that usable tables will be computed, or by
241 * supplying default tables that are valid for the desired precision.)
242 * Otherwise, use Huffman coding by default.
243 */
244 cinfo->arith_code = cinfo->data_precision > 8 ? TRUE : FALSE;
245
246 /* By default, don't do extra passes to optimize entropy coding */
247 cinfo->optimize_coding = FALSE;
248
249 /* By default, use the simpler non-cosited sampling alignment */
250 cinfo->CCIR601_sampling = FALSE;
251
252 /* By default, apply fancy downsampling */
254
255 /* No input smoothing */
256 cinfo->smoothing_factor = 0;
257
258 /* DCT algorithm preference */
259 cinfo->dct_method = JDCT_DEFAULT;
260
261 /* No restart markers */
262 cinfo->restart_interval = 0;
263 cinfo->restart_in_rows = 0;
264
265 /* Fill in default JFIF marker parameters. Note that whether the marker
266 * will actually be written is determined by jpeg_set_colorspace.
267 *
268 * By default, the library emits JFIF version code 1.01.
269 * An application that wants to emit JFIF 1.02 extension markers should set
270 * JFIF_minor_version to 2. We could probably get away with just defaulting
271 * to 1.02, but there may still be some decoders in use that will complain
272 * about that; saying 1.01 should minimize compatibility problems.
273 *
274 * For wide gamut colorspaces (BG_RGB and BG_YCC), the major version will be
275 * overridden by jpeg_set_colorspace and set to 2.
276 */
277 cinfo->JFIF_major_version = 1; /* Default JFIF version = 1.01 */
278 cinfo->JFIF_minor_version = 1;
279 cinfo->density_unit = 0; /* Pixel size is unknown by default */
280 cinfo->X_density = 1; /* Pixel aspect ratio is square by default */
281 cinfo->Y_density = 1;
282
283 /* No color transform */
284 cinfo->color_transform = JCT_NONE;
285
286 /* Choose JPEG colorspace based on input space, set defaults accordingly */
287
289}
#define SIZEOF(_ar)
Definition: calc.h:97
std_huff_tables(j_compress_ptr cinfo)
Definition: jcparam.c:169
jpeg_set_quality(j_compress_ptr cinfo, int quality, boolean force_baseline)
Definition: jcparam.c:149
jpeg_default_colorspace(j_compress_ptr cinfo)
Definition: jcparam.c:297
#define BITS_IN_JSAMPLE
Definition: jmorecfg.h:33
struct jpeg_common_struct * j_common_ptr
Definition: jpeglib.h:284
#define JDCT_DEFAULT
Definition: jpeglib.h:247
@ JCT_NONE
Definition: jpeglib.h:234
#define NUM_ARITH_TBLS
Definition: jpeglib.h:54
#define JPOOL_PERMANENT
Definition: jpeglib.h:807
unsigned int scale_num
Definition: jpeglib.h:317
boolean optimize_coding
Definition: jpeglib.h:359
jpeg_component_info * comp_info
Definition: jpeglib.h:333
const jpeg_scan_info * scan_info
Definition: jpeglib.h:351
unsigned int restart_interval
Definition: jpeglib.h:370
boolean do_fancy_downsampling
Definition: jpeglib.h:361
UINT8 arith_dc_U[NUM_ARITH_TBLS]
Definition: jpeglib.h:347
UINT8 arith_dc_L[NUM_ARITH_TBLS]
Definition: jpeglib.h:346
boolean raw_data_in
Definition: jpeglib.h:357
boolean arith_code
Definition: jpeglib.h:358
UINT8 JFIF_minor_version
Definition: jpeglib.h:377
unsigned int scale_denom
Definition: jpeglib.h:317
J_DCT_METHOD dct_method
Definition: jpeglib.h:363
boolean CCIR601_sampling
Definition: jpeglib.h:360
UINT8 arith_ac_K[NUM_ARITH_TBLS]
Definition: jpeglib.h:348

Referenced by jpeg_copy_critical_parameters(), main(), and write_JPEG_file().

◆ jpeg_set_linear_quality()

jpeg_set_linear_quality ( j_compress_ptr  cinfo,
int  scale_factor,
boolean  force_baseline 
)

Definition at line 106 of file jcparam.c.

113{
114 /* Set up two quantization tables using the specified scaling */
119}

Referenced by jpeg_set_quality().

◆ jpeg_set_quality()

jpeg_set_quality ( j_compress_ptr  cinfo,
int  quality,
boolean  force_baseline 
)

Definition at line 149 of file jcparam.c.

155{
156 /* Convert user 0-100 rating to percentage scaling */
158
159 /* Set up standard quality tables */
161}
jpeg_set_linear_quality(j_compress_ptr cinfo, int scale_factor, boolean force_baseline)
Definition: jcparam.c:106
jpeg_quality_scaling(int quality)
Definition: jcparam.c:123

Referenced by jpeg_set_defaults(), and write_JPEG_file().

◆ std_huff_tables()

std_huff_tables ( j_compress_ptr  cinfo)

Definition at line 169 of file jcparam.c.

170{
171 if (cinfo->dc_huff_tbl_ptrs[0] != NULL)
173
174 if (cinfo->ac_huff_tbl_ptrs[0] != NULL)
176
177 if (cinfo->dc_huff_tbl_ptrs[1] != NULL)
179
180 if (cinfo->ac_huff_tbl_ptrs[1] != NULL)
182}
jpeg_std_huff_table(j_common_ptr cinfo, boolean isDC, int tblno)
Definition: jcomapi.c:117
JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]
Definition: jpeglib.h:342
JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]
Definition: jpeglib.h:343

Referenced by jpeg_set_defaults().

Variable Documentation

◆ std_chrominance_quant_tbl

const unsigned int std_chrominance_quant_tbl[DCTSIZE2]
static
Initial value:
= {
17, 18, 24, 47, 99, 99, 99, 99,
18, 21, 26, 66, 99, 99, 99, 99,
24, 26, 56, 99, 99, 99, 99, 99,
47, 66, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99
}

Definition at line 78 of file jcparam.c.

Referenced by jpeg_default_qtables(), and jpeg_set_linear_quality().

◆ std_luminance_quant_tbl

const unsigned int std_luminance_quant_tbl[DCTSIZE2]
static
Initial value:
= {
16, 11, 10, 16, 24, 40, 51, 61,
12, 12, 14, 19, 26, 58, 60, 55,
14, 13, 16, 24, 40, 57, 69, 56,
14, 17, 22, 29, 51, 87, 80, 62,
18, 22, 37, 56, 68, 109, 103, 77,
24, 35, 55, 64, 81, 104, 113, 92,
49, 64, 78, 87, 103, 121, 120, 101,
72, 92, 95, 98, 112, 100, 103, 99
}

Definition at line 68 of file jcparam.c.

Referenced by jpeg_default_qtables(), and jpeg_set_linear_quality().