1
by Tom Gall
Import upstream version 1.1.90+svn702 |
1 |
/*
|
2 |
* jcparam.c
|
|
3 |
*
|
|
4 |
* Copyright (C) 1991-1998, Thomas G. Lane.
|
|
5 |
* Modified 2003-2008 by Guido Vollbeding.
|
|
1.1.1
by Matthias Klose
Import upstream version 1.1.90+svn733 |
6 |
* Copyright (C) 2009-2011, D. R. Commander.
|
1
by Tom Gall
Import upstream version 1.1.90+svn702 |
7 |
* This file is part of the Independent JPEG Group's software.
|
8 |
* For conditions of distribution and use, see the accompanying README file.
|
|
9 |
*
|
|
10 |
* This file contains optional default-setting code for the JPEG compressor.
|
|
11 |
* Applications do not have to use this file, but those that don't use it
|
|
12 |
* must know a lot more about the innards of the JPEG code.
|
|
13 |
*/
|
|
14 |
||
15 |
#define JPEG_INTERNALS
|
|
16 |
#include "jinclude.h" |
|
17 |
#include "jpeglib.h" |
|
18 |
||
19 |
||
20 |
/*
|
|
21 |
* Quantization table setup routines
|
|
22 |
*/
|
|
23 |
||
24 |
GLOBAL(void) |
|
25 |
jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl, |
|
26 |
const unsigned int *basic_table, |
|
27 |
int scale_factor, boolean force_baseline) |
|
28 |
/* Define a quantization table equal to the basic_table times
|
|
29 |
* a scale factor (given as a percentage).
|
|
30 |
* If force_baseline is TRUE, the computed quantization table entries
|
|
31 |
* are limited to 1..255 for JPEG baseline compatibility.
|
|
32 |
*/
|
|
33 |
{
|
|
34 |
JQUANT_TBL ** qtblptr; |
|
35 |
int i; |
|
36 |
long temp; |
|
37 |
||
38 |
/* Safety check to ensure start_compress not called yet. */
|
|
39 |
if (cinfo->global_state != CSTATE_START) |
|
40 |
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
|
41 |
||
42 |
if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS) |
|
43 |
ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl); |
|
44 |
||
45 |
qtblptr = & cinfo->quant_tbl_ptrs[which_tbl]; |
|
46 |
||
47 |
if (*qtblptr == NULL) |
|
48 |
*qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo); |
|
49 |
||
50 |
for (i = 0; i < DCTSIZE2; i++) { |
|
51 |
temp = ((long) basic_table[i] * scale_factor + 50L) / 100L; |
|
52 |
/* limit the values to the valid range */
|
|
53 |
if (temp <= 0L) temp = 1L; |
|
54 |
if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */ |
|
55 |
if (force_baseline && temp > 255L) |
|
56 |
temp = 255L; /* limit to baseline range if requested */ |
|
57 |
(*qtblptr)->quantval[i] = (UINT16) temp; |
|
58 |
}
|
|
59 |
||
60 |
/* Initialize sent_table FALSE so table will be written to JPEG file. */
|
|
61 |
(*qtblptr)->sent_table = FALSE; |
|
62 |
}
|
|
63 |
||
64 |
||
65 |
/* These are the sample quantization tables given in JPEG spec section K.1.
|
|
66 |
* The spec says that the values given produce "good" quality, and
|
|
67 |
* when divided by 2, "very good" quality.
|
|
68 |
*/
|
|
69 |
static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = { |
|
70 |
16, 11, 10, 16, 24, 40, 51, 61, |
|
71 |
12, 12, 14, 19, 26, 58, 60, 55, |
|
72 |
14, 13, 16, 24, 40, 57, 69, 56, |
|
73 |
14, 17, 22, 29, 51, 87, 80, 62, |
|
74 |
18, 22, 37, 56, 68, 109, 103, 77, |
|
75 |
24, 35, 55, 64, 81, 104, 113, 92, |
|
76 |
49, 64, 78, 87, 103, 121, 120, 101, |
|
77 |
72, 92, 95, 98, 112, 100, 103, 99 |
|
78 |
};
|
|
79 |
static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = { |
|
80 |
17, 18, 24, 47, 99, 99, 99, 99, |
|
81 |
18, 21, 26, 66, 99, 99, 99, 99, |
|
82 |
24, 26, 56, 99, 99, 99, 99, 99, |
|
83 |
47, 66, 99, 99, 99, 99, 99, 99, |
|
84 |
99, 99, 99, 99, 99, 99, 99, 99, |
|
85 |
99, 99, 99, 99, 99, 99, 99, 99, |
|
86 |
99, 99, 99, 99, 99, 99, 99, 99, |
|
87 |
99, 99, 99, 99, 99, 99, 99, 99 |
|
88 |
};
|
|
89 |
||
90 |
||
91 |
#if JPEG_LIB_VERSION >= 70
|
|
92 |
GLOBAL(void) |
|
93 |
jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline) |
|
94 |
/* Set or change the 'quality' (quantization) setting, using default tables
|
|
95 |
* and straight percentage-scaling quality scales.
|
|
96 |
* This entry point allows different scalings for luminance and chrominance.
|
|
97 |
*/
|
|
98 |
{
|
|
99 |
/* Set up two quantization tables using the specified scaling */
|
|
100 |
jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl, |
|
101 |
cinfo->q_scale_factor[0], force_baseline); |
|
102 |
jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl, |
|
103 |
cinfo->q_scale_factor[1], force_baseline); |
|
104 |
}
|
|
105 |
#endif
|
|
106 |
||
107 |
||
108 |
GLOBAL(void) |
|
109 |
jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor, |
|
110 |
boolean force_baseline) |
|
111 |
/* Set or change the 'quality' (quantization) setting, using default tables
|
|
112 |
* and a straight percentage-scaling quality scale. In most cases it's better
|
|
113 |
* to use jpeg_set_quality (below); this entry point is provided for
|
|
114 |
* applications that insist on a linear percentage scaling.
|
|
115 |
*/
|
|
116 |
{
|
|
117 |
/* Set up two quantization tables using the specified scaling */
|
|
118 |
jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl, |
|
119 |
scale_factor, force_baseline); |
|
120 |
jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl, |
|
121 |
scale_factor, force_baseline); |
|
122 |
}
|
|
123 |
||
124 |
||
125 |
GLOBAL(int) |
|
126 |
jpeg_quality_scaling (int quality) |
|
127 |
/* Convert a user-specified quality rating to a percentage scaling factor
|
|
128 |
* for an underlying quantization table, using our recommended scaling curve.
|
|
129 |
* The input 'quality' factor should be 0 (terrible) to 100 (very good).
|
|
130 |
*/
|
|
131 |
{
|
|
132 |
/* Safety limit on quality factor. Convert 0 to 1 to avoid zero divide. */
|
|
133 |
if (quality <= 0) quality = 1; |
|
134 |
if (quality > 100) quality = 100; |
|
135 |
||
136 |
/* The basic table is used as-is (scaling 100) for a quality of 50.
|
|
137 |
* Qualities 50..100 are converted to scaling percentage 200 - 2*Q;
|
|
138 |
* note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table
|
|
139 |
* to make all the table entries 1 (hence, minimum quantization loss).
|
|
140 |
* Qualities 1..50 are converted to scaling percentage 5000/Q.
|
|
141 |
*/
|
|
142 |
if (quality < 50) |
|
143 |
quality = 5000 / quality; |
|
144 |
else
|
|
145 |
quality = 200 - quality*2; |
|
146 |
||
147 |
return quality; |
|
148 |
}
|
|
149 |
||
150 |
||
151 |
GLOBAL(void) |
|
152 |
jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline) |
|
153 |
/* Set or change the 'quality' (quantization) setting, using default tables.
|
|
154 |
* This is the standard quality-adjusting entry point for typical user
|
|
155 |
* interfaces; only those who want detailed control over quantization tables
|
|
156 |
* would use the preceding three routines directly.
|
|
157 |
*/
|
|
158 |
{
|
|
159 |
/* Convert user 0-100 rating to percentage scaling */
|
|
160 |
quality = jpeg_quality_scaling(quality); |
|
161 |
||
162 |
/* Set up standard quality tables */
|
|
163 |
jpeg_set_linear_quality(cinfo, quality, force_baseline); |
|
164 |
}
|
|
165 |
||
166 |
||
167 |
/*
|
|
168 |
* Huffman table setup routines
|
|
169 |
*/
|
|
170 |
||
171 |
LOCAL(void) |
|
172 |
add_huff_table (j_compress_ptr cinfo, |
|
173 |
JHUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val) |
|
174 |
/* Define a Huffman table */
|
|
175 |
{
|
|
176 |
int nsymbols, len; |
|
177 |
||
178 |
if (*htblptr == NULL) |
|
179 |
*htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo); |
|
180 |
||
181 |
/* Copy the number-of-symbols-of-each-code-length counts */
|
|
182 |
MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits)); |
|
183 |
||
184 |
/* Validate the counts. We do this here mainly so we can copy the right
|
|
185 |
* number of symbols from the val[] array, without risking marching off
|
|
186 |
* the end of memory. jchuff.c will do a more thorough test later.
|
|
187 |
*/
|
|
188 |
nsymbols = 0; |
|
189 |
for (len = 1; len <= 16; len++) |
|
190 |
nsymbols += bits[len]; |
|
191 |
if (nsymbols < 1 || nsymbols > 256) |
|
192 |
ERREXIT(cinfo, JERR_BAD_HUFF_TABLE); |
|
193 |
||
194 |
MEMCOPY((*htblptr)->huffval, val, nsymbols * SIZEOF(UINT8)); |
|
195 |
||
196 |
/* Initialize sent_table FALSE so table will be written to JPEG file. */
|
|
197 |
(*htblptr)->sent_table = FALSE; |
|
198 |
}
|
|
199 |
||
200 |
||
201 |
LOCAL(void) |
|
202 |
std_huff_tables (j_compress_ptr cinfo) |
|
203 |
/* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
|
|
204 |
/* IMPORTANT: these are only valid for 8-bit data precision! */
|
|
205 |
{
|
|
206 |
static const UINT8 bits_dc_luminance[17] = |
|
207 |
{ /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 }; |
|
208 |
static const UINT8 val_dc_luminance[] = |
|
209 |
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; |
|
210 |
||
211 |
static const UINT8 bits_dc_chrominance[17] = |
|
212 |
{ /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }; |
|
213 |
static const UINT8 val_dc_chrominance[] = |
|
214 |
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; |
|
215 |
||
216 |
static const UINT8 bits_ac_luminance[17] = |
|
217 |
{ /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d }; |
|
218 |
static const UINT8 val_ac_luminance[] = |
|
219 |
{ 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, |
|
220 |
0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, |
|
221 |
0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, |
|
222 |
0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, |
|
223 |
0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, |
|
224 |
0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, |
|
225 |
0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, |
|
226 |
0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, |
|
227 |
0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, |
|
228 |
0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, |
|
229 |
0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, |
|
230 |
0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, |
|
231 |
0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, |
|
232 |
0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, |
|
233 |
0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, |
|
234 |
0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, |
|
235 |
0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, |
|
236 |
0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, |
|
237 |
0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, |
|
238 |
0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, |
|
239 |
0xf9, 0xfa }; |
|
240 |
||
241 |
static const UINT8 bits_ac_chrominance[17] = |
|
242 |
{ /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 }; |
|
243 |
static const UINT8 val_ac_chrominance[] = |
|
244 |
{ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, |
|
245 |
0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, |
|
246 |
0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, |
|
247 |
0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, |
|
248 |
0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, |
|
249 |
0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, |
|
250 |
0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, |
|
251 |
0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, |
|
252 |
0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, |
|
253 |
0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, |
|
254 |
0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, |
|
255 |
0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, |
|
256 |
0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, |
|
257 |
0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, |
|
258 |
0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, |
|
259 |
0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, |
|
260 |
0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, |
|
261 |
0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, |
|
262 |
0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, |
|
263 |
0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, |
|
264 |
0xf9, 0xfa }; |
|
265 |
||
266 |
add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[0], |
|
267 |
bits_dc_luminance, val_dc_luminance); |
|
268 |
add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[0], |
|
269 |
bits_ac_luminance, val_ac_luminance); |
|
270 |
add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[1], |
|
271 |
bits_dc_chrominance, val_dc_chrominance); |
|
272 |
add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[1], |
|
273 |
bits_ac_chrominance, val_ac_chrominance); |
|
274 |
}
|
|
275 |
||
276 |
||
277 |
/*
|
|
278 |
* Default parameter setup for compression.
|
|
279 |
*
|
|
280 |
* Applications that don't choose to use this routine must do their
|
|
281 |
* own setup of all these parameters. Alternately, you can call this
|
|
282 |
* to establish defaults and then alter parameters selectively. This
|
|
283 |
* is the recommended approach since, if we add any new parameters,
|
|
284 |
* your code will still work (they'll be set to reasonable defaults).
|
|
285 |
*/
|
|
286 |
||
287 |
GLOBAL(void) |
|
288 |
jpeg_set_defaults (j_compress_ptr cinfo) |
|
289 |
{
|
|
290 |
int i; |
|
291 |
||
292 |
/* Safety check to ensure start_compress not called yet. */
|
|
293 |
if (cinfo->global_state != CSTATE_START) |
|
294 |
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
|
295 |
||
296 |
/* Allocate comp_info array large enough for maximum component count.
|
|
297 |
* Array is made permanent in case application wants to compress
|
|
298 |
* multiple images at same param settings.
|
|
299 |
*/
|
|
300 |
if (cinfo->comp_info == NULL) |
|
301 |
cinfo->comp_info = (jpeg_component_info *) |
|
302 |
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, |
|
303 |
MAX_COMPONENTS * SIZEOF(jpeg_component_info)); |
|
304 |
||
305 |
/* Initialize everything not dependent on the color space */
|
|
306 |
||
307 |
#if JPEG_LIB_VERSION >= 70
|
|
308 |
cinfo->scale_num = 1; /* 1:1 scaling */ |
|
309 |
cinfo->scale_denom = 1; |
|
310 |
#endif
|
|
311 |
cinfo->data_precision = BITS_IN_JSAMPLE; |
|
312 |
/* Set up two quantization tables using default quality of 75 */
|
|
313 |
jpeg_set_quality(cinfo, 75, TRUE); |
|
314 |
/* Set up two Huffman tables */
|
|
315 |
std_huff_tables(cinfo); |
|
316 |
||
317 |
/* Initialize default arithmetic coding conditioning */
|
|
318 |
for (i = 0; i < NUM_ARITH_TBLS; i++) { |
|
319 |
cinfo->arith_dc_L[i] = 0; |
|
320 |
cinfo->arith_dc_U[i] = 1; |
|
321 |
cinfo->arith_ac_K[i] = 5; |
|
322 |
}
|
|
323 |
||
324 |
/* Default is no multiple-scan output */
|
|
325 |
cinfo->scan_info = NULL; |
|
326 |
cinfo->num_scans = 0; |
|
327 |
||
328 |
/* Expect normal source image, not raw downsampled data */
|
|
329 |
cinfo->raw_data_in = FALSE; |
|
330 |
||
331 |
/* Use Huffman coding, not arithmetic coding, by default */
|
|
332 |
cinfo->arith_code = FALSE; |
|
333 |
||
334 |
/* By default, don't do extra passes to optimize entropy coding */
|
|
335 |
cinfo->optimize_coding = FALSE; |
|
336 |
/* The standard Huffman tables are only valid for 8-bit data precision.
|
|
337 |
* If the precision is higher, force optimization on so that usable
|
|
338 |
* tables will be computed. This test can be removed if default tables
|
|
339 |
* are supplied that are valid for the desired precision.
|
|
340 |
*/
|
|
341 |
if (cinfo->data_precision > 8) |
|
342 |
cinfo->optimize_coding = TRUE; |
|
343 |
||
344 |
/* By default, use the simpler non-cosited sampling alignment */
|
|
345 |
cinfo->CCIR601_sampling = FALSE; |
|
346 |
||
347 |
#if JPEG_LIB_VERSION >= 70
|
|
348 |
/* By default, apply fancy downsampling */
|
|
349 |
cinfo->do_fancy_downsampling = TRUE; |
|
350 |
#endif
|
|
351 |
||
352 |
/* No input smoothing */
|
|
353 |
cinfo->smoothing_factor = 0; |
|
354 |
||
355 |
/* DCT algorithm preference */
|
|
356 |
cinfo->dct_method = JDCT_DEFAULT; |
|
357 |
||
358 |
/* No restart markers */
|
|
359 |
cinfo->restart_interval = 0; |
|
360 |
cinfo->restart_in_rows = 0; |
|
361 |
||
362 |
/* Fill in default JFIF marker parameters. Note that whether the marker
|
|
363 |
* will actually be written is determined by jpeg_set_colorspace.
|
|
364 |
*
|
|
365 |
* By default, the library emits JFIF version code 1.01.
|
|
366 |
* An application that wants to emit JFIF 1.02 extension markers should set
|
|
367 |
* JFIF_minor_version to 2. We could probably get away with just defaulting
|
|
368 |
* to 1.02, but there may still be some decoders in use that will complain
|
|
369 |
* about that; saying 1.01 should minimize compatibility problems.
|
|
370 |
*/
|
|
371 |
cinfo->JFIF_major_version = 1; /* Default JFIF version = 1.01 */ |
|
372 |
cinfo->JFIF_minor_version = 1; |
|
373 |
cinfo->density_unit = 0; /* Pixel size is unknown by default */ |
|
374 |
cinfo->X_density = 1; /* Pixel aspect ratio is square by default */ |
|
375 |
cinfo->Y_density = 1; |
|
376 |
||
377 |
/* Choose JPEG colorspace based on input space, set defaults accordingly */
|
|
378 |
||
379 |
jpeg_default_colorspace(cinfo); |
|
380 |
}
|
|
381 |
||
382 |
||
383 |
/*
|
|
384 |
* Select an appropriate JPEG colorspace for in_color_space.
|
|
385 |
*/
|
|
386 |
||
387 |
GLOBAL(void) |
|
388 |
jpeg_default_colorspace (j_compress_ptr cinfo) |
|
389 |
{
|
|
390 |
switch (cinfo->in_color_space) { |
|
391 |
case JCS_GRAYSCALE: |
|
392 |
jpeg_set_colorspace(cinfo, JCS_GRAYSCALE); |
|
393 |
break; |
|
394 |
case JCS_RGB: |
|
395 |
case JCS_EXT_RGB: |
|
396 |
case JCS_EXT_RGBX: |
|
397 |
case JCS_EXT_BGR: |
|
398 |
case JCS_EXT_BGRX: |
|
399 |
case JCS_EXT_XBGR: |
|
400 |
case JCS_EXT_XRGB: |
|
1.1.1
by Matthias Klose
Import upstream version 1.1.90+svn733 |
401 |
case JCS_EXT_RGBA: |
402 |
case JCS_EXT_BGRA: |
|
403 |
case JCS_EXT_ABGR: |
|
404 |
case JCS_EXT_ARGB: |
|
1
by Tom Gall
Import upstream version 1.1.90+svn702 |
405 |
jpeg_set_colorspace(cinfo, JCS_YCbCr); |
406 |
break; |
|
407 |
case JCS_YCbCr: |
|
408 |
jpeg_set_colorspace(cinfo, JCS_YCbCr); |
|
409 |
break; |
|
410 |
case JCS_CMYK: |
|
411 |
jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */ |
|
412 |
break; |
|
413 |
case JCS_YCCK: |
|
414 |
jpeg_set_colorspace(cinfo, JCS_YCCK); |
|
415 |
break; |
|
416 |
case JCS_UNKNOWN: |
|
417 |
jpeg_set_colorspace(cinfo, JCS_UNKNOWN); |
|
418 |
break; |
|
419 |
default: |
|
420 |
ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); |
|
421 |
}
|
|
422 |
}
|
|
423 |
||
424 |
||
425 |
/*
|
|
426 |
* Set the JPEG colorspace, and choose colorspace-dependent default values.
|
|
427 |
*/
|
|
428 |
||
429 |
GLOBAL(void) |
|
430 |
jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace) |
|
431 |
{
|
|
432 |
jpeg_component_info * compptr; |
|
433 |
int ci; |
|
434 |
||
435 |
#define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl) \
|
|
436 |
(compptr = &cinfo->comp_info[index], \
|
|
437 |
compptr->component_id = (id), \
|
|
438 |
compptr->h_samp_factor = (hsamp), \
|
|
439 |
compptr->v_samp_factor = (vsamp), \
|
|
440 |
compptr->quant_tbl_no = (quant), \
|
|
441 |
compptr->dc_tbl_no = (dctbl), \
|
|
442 |
compptr->ac_tbl_no = (actbl) )
|
|
443 |
||
444 |
/* Safety check to ensure start_compress not called yet. */
|
|
445 |
if (cinfo->global_state != CSTATE_START) |
|
446 |
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
|
447 |
||
448 |
/* For all colorspaces, we use Q and Huff tables 0 for luminance components,
|
|
449 |
* tables 1 for chrominance components.
|
|
450 |
*/
|
|
451 |
||
452 |
cinfo->jpeg_color_space = colorspace; |
|
453 |
||
454 |
cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */ |
|
455 |
cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */ |
|
456 |
||
457 |
switch (colorspace) { |
|
458 |
case JCS_GRAYSCALE: |
|
459 |
cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */ |
|
460 |
cinfo->num_components = 1; |
|
461 |
/* JFIF specifies component ID 1 */
|
|
462 |
SET_COMP(0, 1, 1,1, 0, 0,0); |
|
463 |
break; |
|
464 |
case JCS_RGB: |
|
465 |
cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */ |
|
466 |
cinfo->num_components = 3; |
|
467 |
SET_COMP(0, 0x52 /* 'R' */, 1,1, 0, 0,0); |
|
468 |
SET_COMP(1, 0x47 /* 'G' */, 1,1, 0, 0,0); |
|
469 |
SET_COMP(2, 0x42 /* 'B' */, 1,1, 0, 0,0); |
|
470 |
break; |
|
471 |
case JCS_YCbCr: |
|
472 |
cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */ |
|
473 |
cinfo->num_components = 3; |
|
474 |
/* JFIF specifies component IDs 1,2,3 */
|
|
475 |
/* We default to 2x2 subsamples of chrominance */
|
|
476 |
SET_COMP(0, 1, 2,2, 0, 0,0); |
|
477 |
SET_COMP(1, 2, 1,1, 1, 1,1); |
|
478 |
SET_COMP(2, 3, 1,1, 1, 1,1); |
|
479 |
break; |
|
480 |
case JCS_CMYK: |
|
481 |
cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */ |
|
482 |
cinfo->num_components = 4; |
|
483 |
SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0); |
|
484 |
SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0); |
|
485 |
SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0); |
|
486 |
SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0); |
|
487 |
break; |
|
488 |
case JCS_YCCK: |
|
489 |
cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */ |
|
490 |
cinfo->num_components = 4; |
|
491 |
SET_COMP(0, 1, 2,2, 0, 0,0); |
|
492 |
SET_COMP(1, 2, 1,1, 1, 1,1); |
|
493 |
SET_COMP(2, 3, 1,1, 1, 1,1); |
|
494 |
SET_COMP(3, 4, 2,2, 0, 0,0); |
|
495 |
break; |
|
496 |
case JCS_UNKNOWN: |
|
497 |
cinfo->num_components = cinfo->input_components; |
|
498 |
if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS) |
|
499 |
ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components, |
|
500 |
MAX_COMPONENTS); |
|
501 |
for (ci = 0; ci < cinfo->num_components; ci++) { |
|
502 |
SET_COMP(ci, ci, 1,1, 0, 0,0); |
|
503 |
}
|
|
504 |
break; |
|
505 |
default: |
|
506 |
ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
|
507 |
}
|
|
508 |
}
|
|
509 |
||
510 |
||
511 |
#ifdef C_PROGRESSIVE_SUPPORTED
|
|
512 |
||
513 |
LOCAL(jpeg_scan_info *) |
|
514 |
fill_a_scan (jpeg_scan_info * scanptr, int ci, |
|
515 |
int Ss, int Se, int Ah, int Al) |
|
516 |
/* Support routine: generate one scan for specified component */
|
|
517 |
{
|
|
518 |
scanptr->comps_in_scan = 1; |
|
519 |
scanptr->component_index[0] = ci; |
|
520 |
scanptr->Ss = Ss; |
|
521 |
scanptr->Se = Se; |
|
522 |
scanptr->Ah = Ah; |
|
523 |
scanptr->Al = Al; |
|
524 |
scanptr++; |
|
525 |
return scanptr; |
|
526 |
}
|
|
527 |
||
528 |
LOCAL(jpeg_scan_info *) |
|
529 |
fill_scans (jpeg_scan_info * scanptr, int ncomps, |
|
530 |
int Ss, int Se, int Ah, int Al) |
|
531 |
/* Support routine: generate one scan for each component */
|
|
532 |
{
|
|
533 |
int ci; |
|
534 |
||
535 |
for (ci = 0; ci < ncomps; ci++) { |
|
536 |
scanptr->comps_in_scan = 1; |
|
537 |
scanptr->component_index[0] = ci; |
|
538 |
scanptr->Ss = Ss; |
|
539 |
scanptr->Se = Se; |
|
540 |
scanptr->Ah = Ah; |
|
541 |
scanptr->Al = Al; |
|
542 |
scanptr++; |
|
543 |
}
|
|
544 |
return scanptr; |
|
545 |
}
|
|
546 |
||
547 |
LOCAL(jpeg_scan_info *) |
|
548 |
fill_dc_scans (jpeg_scan_info * scanptr, int ncomps, int Ah, int Al) |
|
549 |
/* Support routine: generate interleaved DC scan if possible, else N scans */
|
|
550 |
{
|
|
551 |
int ci; |
|
552 |
||
553 |
if (ncomps <= MAX_COMPS_IN_SCAN) { |
|
554 |
/* Single interleaved DC scan */
|
|
555 |
scanptr->comps_in_scan = ncomps; |
|
556 |
for (ci = 0; ci < ncomps; ci++) |
|
557 |
scanptr->component_index[ci] = ci; |
|
558 |
scanptr->Ss = scanptr->Se = 0; |
|
559 |
scanptr->Ah = Ah; |
|
560 |
scanptr->Al = Al; |
|
561 |
scanptr++; |
|
562 |
} else { |
|
563 |
/* Noninterleaved DC scan for each component */
|
|
564 |
scanptr = fill_scans(scanptr, ncomps, 0, 0, Ah, Al); |
|
565 |
}
|
|
566 |
return scanptr; |
|
567 |
}
|
|
568 |
||
569 |
||
570 |
/*
|
|
571 |
* Create a recommended progressive-JPEG script.
|
|
572 |
* cinfo->num_components and cinfo->jpeg_color_space must be correct.
|
|
573 |
*/
|
|
574 |
||
575 |
GLOBAL(void) |
|
576 |
jpeg_simple_progression (j_compress_ptr cinfo) |
|
577 |
{
|
|
578 |
int ncomps = cinfo->num_components; |
|
579 |
int nscans; |
|
580 |
jpeg_scan_info * scanptr; |
|
581 |
||
582 |
/* Safety check to ensure start_compress not called yet. */
|
|
583 |
if (cinfo->global_state != CSTATE_START) |
|
584 |
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
|
585 |
||
586 |
/* Figure space needed for script. Calculation must match code below! */
|
|
587 |
if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) { |
|
588 |
/* Custom script for YCbCr color images. */
|
|
589 |
nscans = 10; |
|
590 |
} else { |
|
591 |
/* All-purpose script for other color spaces. */
|
|
592 |
if (ncomps > MAX_COMPS_IN_SCAN) |
|
593 |
nscans = 6 * ncomps; /* 2 DC + 4 AC scans per component */ |
|
594 |
else
|
|
595 |
nscans = 2 + 4 * ncomps; /* 2 DC scans; 4 AC scans per component */ |
|
596 |
}
|
|
597 |
||
598 |
/* Allocate space for script.
|
|
599 |
* We need to put it in the permanent pool in case the application performs
|
|
600 |
* multiple compressions without changing the settings. To avoid a memory
|
|
601 |
* leak if jpeg_simple_progression is called repeatedly for the same JPEG
|
|
602 |
* object, we try to re-use previously allocated space, and we allocate
|
|
603 |
* enough space to handle YCbCr even if initially asked for grayscale.
|
|
604 |
*/
|
|
605 |
if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) { |
|
606 |
cinfo->script_space_size = MAX(nscans, 10); |
|
607 |
cinfo->script_space = (jpeg_scan_info *) |
|
608 |
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, |
|
609 |
cinfo->script_space_size * SIZEOF(jpeg_scan_info)); |
|
610 |
}
|
|
611 |
scanptr = cinfo->script_space; |
|
612 |
cinfo->scan_info = scanptr; |
|
613 |
cinfo->num_scans = nscans; |
|
614 |
||
615 |
if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) { |
|
616 |
/* Custom script for YCbCr color images. */
|
|
617 |
/* Initial DC scan */
|
|
618 |
scanptr = fill_dc_scans(scanptr, ncomps, 0, 1); |
|
619 |
/* Initial AC scan: get some luma data out in a hurry */
|
|
620 |
scanptr = fill_a_scan(scanptr, 0, 1, 5, 0, 2); |
|
621 |
/* Chroma data is too small to be worth expending many scans on */
|
|
622 |
scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 1); |
|
623 |
scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 1); |
|
624 |
/* Complete spectral selection for luma AC */
|
|
625 |
scanptr = fill_a_scan(scanptr, 0, 6, 63, 0, 2); |
|
626 |
/* Refine next bit of luma AC */
|
|
627 |
scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1); |
|
628 |
/* Finish DC successive approximation */
|
|
629 |
scanptr = fill_dc_scans(scanptr, ncomps, 1, 0); |
|
630 |
/* Finish AC successive approximation */
|
|
631 |
scanptr = fill_a_scan(scanptr, 2, 1, 63, 1, 0); |
|
632 |
scanptr = fill_a_scan(scanptr, 1, 1, 63, 1, 0); |
|
633 |
/* Luma bottom bit comes last since it's usually largest scan */
|
|
634 |
scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0); |
|
635 |
} else { |
|
636 |
/* All-purpose script for other color spaces. */
|
|
637 |
/* Successive approximation first pass */
|
|
638 |
scanptr = fill_dc_scans(scanptr, ncomps, 0, 1); |
|
639 |
scanptr = fill_scans(scanptr, ncomps, 1, 5, 0, 2); |
|
640 |
scanptr = fill_scans(scanptr, ncomps, 6, 63, 0, 2); |
|
641 |
/* Successive approximation second pass */
|
|
642 |
scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1); |
|
643 |
/* Successive approximation final pass */
|
|
644 |
scanptr = fill_dc_scans(scanptr, ncomps, 1, 0); |
|
645 |
scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0); |
|
646 |
}
|
|
647 |
}
|
|
648 |
||
649 |
#endif /* C_PROGRESSIVE_SUPPORTED */ |