OLD | NEW |
1 /* | 1 /* |
2 * jmorecfg.h | 2 * jmorecfg.h |
3 * | 3 * |
4 * Copyright (C) 1991-1997, Thomas G. Lane. | 4 * Copyright (C) 1991-1997, Thomas G. Lane. |
5 * This file is part of the Independent JPEG Group's software. | 5 * This file is part of the Independent JPEG Group's software. |
6 * For conditions of distribution and use, see the accompanying README file. | 6 * For conditions of distribution and use, see the accompanying README file. |
7 * | 7 * |
8 * This file contains additional configuration options that customize the | 8 * This file contains additional configuration options that customize the |
9 * JPEG software for special applications or support machine-dependent | 9 * JPEG software for special applications or support machine-dependent |
10 * optimizations. Most users will not need to touch this file. | 10 * optimizations. Most users will not need to touch this file. |
11 */ | 11 */ |
12 | 12 |
13 #ifdef _MSC_VER | 13 #ifdef _MSC_VER |
14 #pragma warning (disable : 4142) | 14 #pragma warning(disable : 4142) |
15 #endif | 15 #endif |
16 | 16 |
17 /* | 17 /* |
18 * Define BITS_IN_JSAMPLE as either | 18 * Define BITS_IN_JSAMPLE as either |
19 * 8 for 8-bit sample values (the usual setting) | 19 * 8 for 8-bit sample values (the usual setting) |
20 * 12 for 12-bit sample values | 20 * 12 for 12-bit sample values |
21 * Only 8 and 12 are legal data precisions for lossy JPEG according to the | 21 * Only 8 and 12 are legal data precisions for lossy JPEG according to the |
22 * JPEG standard, and the IJG code does not support anything else! | 22 * JPEG standard, and the IJG code does not support anything else! |
23 * We do not support run-time selection of data precision, sorry. | 23 * We do not support run-time selection of data precision, sorry. |
24 */ | 24 */ |
25 | 25 |
26 #define BITS_IN_JSAMPLE 8» /* use 8 or 12 */ | 26 #define BITS_IN_JSAMPLE 8 /* use 8 or 12 */ |
27 | |
28 | 27 |
29 /* | 28 /* |
30 * Maximum number of components (color channels) allowed in JPEG image. | 29 * Maximum number of components (color channels) allowed in JPEG image. |
31 * To meet the letter of the JPEG spec, set this to 255. However, darn | 30 * To meet the letter of the JPEG spec, set this to 255. However, darn |
32 * few applications need more than 4 channels (maybe 5 for CMYK + alpha | 31 * few applications need more than 4 channels (maybe 5 for CMYK + alpha |
33 * mask). We recommend 10 as a reasonable compromise; use 4 if you are | 32 * mask). We recommend 10 as a reasonable compromise; use 4 if you are |
34 * really short on memory. (Each allowed component costs a hundred or so | 33 * really short on memory. (Each allowed component costs a hundred or so |
35 * bytes of storage, whether actually used in an image or not.) | 34 * bytes of storage, whether actually used in an image or not.) |
36 */ | 35 */ |
37 | 36 |
38 #define MAX_COMPONENTS 10» /* maximum number of image components */ | 37 #define MAX_COMPONENTS 10 /* maximum number of image components */ |
39 | |
40 | 38 |
41 /* | 39 /* |
42 * Basic data types. | 40 * Basic data types. |
43 * You may need to change these if you have a machine with unusual data | 41 * You may need to change these if you have a machine with unusual data |
44 * type sizes; for example, "char" not 8 bits, "short" not 16 bits, | 42 * type sizes; for example, "char" not 8 bits, "short" not 16 bits, |
45 * or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits, | 43 * or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits, |
46 * but it had better be at least 16. | 44 * but it had better be at least 16. |
47 */ | 45 */ |
48 | 46 |
49 /* Representation of a single sample (pixel element value). | 47 /* Representation of a single sample (pixel element value). |
50 * We frequently allocate large arrays of these, so it's important to keep | 48 * We frequently allocate large arrays of these, so it's important to keep |
51 * them small. But if you have memory to burn and access to char or short | 49 * them small. But if you have memory to burn and access to char or short |
52 * arrays is very slow on your hardware, you might want to change these. | 50 * arrays is very slow on your hardware, you might want to change these. |
53 */ | 51 */ |
54 | 52 |
55 #if BITS_IN_JSAMPLE == 8 | 53 #if BITS_IN_JSAMPLE == 8 |
56 /* JSAMPLE should be the smallest type that will hold the values 0..255. | 54 /* JSAMPLE should be the smallest type that will hold the values 0..255. |
57 * You can use a signed char by having GETJSAMPLE mask it with 0xFF. | 55 * You can use a signed char by having GETJSAMPLE mask it with 0xFF. |
58 */ | 56 */ |
59 | 57 |
60 #ifdef HAVE_UNSIGNED_CHAR | 58 #ifdef HAVE_UNSIGNED_CHAR |
61 | 59 |
62 typedef unsigned char JSAMPLE; | 60 typedef unsigned char JSAMPLE; |
63 #define GETJSAMPLE(value) ((int) (value)) | 61 #define GETJSAMPLE(value) ((int)(value)) |
64 | 62 |
65 #else /* not HAVE_UNSIGNED_CHAR */ | 63 #else /* not HAVE_UNSIGNED_CHAR */ |
66 | 64 |
67 typedef char JSAMPLE; | 65 typedef char JSAMPLE; |
68 #ifdef CHAR_IS_UNSIGNED | 66 #ifdef CHAR_IS_UNSIGNED |
69 #define GETJSAMPLE(value) ((int) (value)) | 67 #define GETJSAMPLE(value) ((int)(value)) |
70 #else | 68 #else |
71 #define GETJSAMPLE(value) ((int) (value) & 0xFF) | 69 #define GETJSAMPLE(value) ((int)(value)&0xFF) |
72 #endif /* CHAR_IS_UNSIGNED */ | 70 #endif /* CHAR_IS_UNSIGNED */ |
73 | 71 |
74 #endif /* HAVE_UNSIGNED_CHAR */ | 72 #endif /* HAVE_UNSIGNED_CHAR */ |
75 | 73 |
76 #define MAXJSAMPLE» 255 | 74 #define MAXJSAMPLE 255 |
77 #define CENTERJSAMPLE» 128 | 75 #define CENTERJSAMPLE 128 |
78 | 76 |
79 #endif /* BITS_IN_JSAMPLE == 8 */ | 77 #endif /* BITS_IN_JSAMPLE == 8 */ |
80 | 78 |
81 | |
82 #if BITS_IN_JSAMPLE == 12 | 79 #if BITS_IN_JSAMPLE == 12 |
83 /* JSAMPLE should be the smallest type that will hold the values 0..4095. | 80 /* JSAMPLE should be the smallest type that will hold the values 0..4095. |
84 * On nearly all machines "short" will do nicely. | 81 * On nearly all machines "short" will do nicely. |
85 */ | 82 */ |
86 | 83 |
87 typedef short JSAMPLE; | 84 typedef short JSAMPLE; |
88 #define GETJSAMPLE(value) ((int) (value)) | 85 #define GETJSAMPLE(value) ((int)(value)) |
89 | 86 |
90 #define MAXJSAMPLE» 4095 | 87 #define MAXJSAMPLE 4095 |
91 #define CENTERJSAMPLE» 2048 | 88 #define CENTERJSAMPLE 2048 |
92 | 89 |
93 #endif /* BITS_IN_JSAMPLE == 12 */ | 90 #endif /* BITS_IN_JSAMPLE == 12 */ |
94 | 91 |
95 | |
96 /* Representation of a DCT frequency coefficient. | 92 /* Representation of a DCT frequency coefficient. |
97 * This should be a signed value of at least 16 bits; "short" is usually OK. | 93 * This should be a signed value of at least 16 bits; "short" is usually OK. |
98 * Again, we allocate large arrays of these, but you can change to int | 94 * Again, we allocate large arrays of these, but you can change to int |
99 * if you have memory to burn and "short" is really slow. | 95 * if you have memory to burn and "short" is really slow. |
100 */ | 96 */ |
101 | 97 |
102 typedef short JCOEF; | 98 typedef short JCOEF; |
103 | 99 |
104 | |
105 /* Compressed datastreams are represented as arrays of JOCTET. | 100 /* Compressed datastreams are represented as arrays of JOCTET. |
106 * These must be EXACTLY 8 bits wide, at least once they are written to | 101 * These must be EXACTLY 8 bits wide, at least once they are written to |
107 * external storage. Note that when using the stdio data source/destination | 102 * external storage. Note that when using the stdio data source/destination |
108 * managers, this is also the data type passed to fread/fwrite. | 103 * managers, this is also the data type passed to fread/fwrite. |
109 */ | 104 */ |
110 | 105 |
111 #ifdef HAVE_UNSIGNED_CHAR | 106 #ifdef HAVE_UNSIGNED_CHAR |
112 | 107 |
113 typedef unsigned char JOCTET; | 108 typedef unsigned char JOCTET; |
114 #define GETJOCTET(value) (value) | 109 #define GETJOCTET(value) (value) |
115 | 110 |
116 #else /* not HAVE_UNSIGNED_CHAR */ | 111 #else /* not HAVE_UNSIGNED_CHAR */ |
117 | 112 |
118 typedef char JOCTET; | 113 typedef char JOCTET; |
119 #ifdef CHAR_IS_UNSIGNED | 114 #ifdef CHAR_IS_UNSIGNED |
120 #define GETJOCTET(value) (value) | 115 #define GETJOCTET(value) (value) |
121 #else | 116 #else |
122 #define GETJOCTET(value) ((value) & 0xFF) | 117 #define GETJOCTET(value) ((value)&0xFF) |
123 #endif /* CHAR_IS_UNSIGNED */ | 118 #endif /* CHAR_IS_UNSIGNED */ |
124 | 119 |
125 #endif /* HAVE_UNSIGNED_CHAR */ | 120 #endif /* HAVE_UNSIGNED_CHAR */ |
126 | 121 |
127 | |
128 /* These typedefs are used for various table entries and so forth. | 122 /* These typedefs are used for various table entries and so forth. |
129 * They must be at least as wide as specified; but making them too big | 123 * They must be at least as wide as specified; but making them too big |
130 * won't cost a huge amount of memory, so we don't provide special | 124 * won't cost a huge amount of memory, so we don't provide special |
131 * extraction code like we did for JSAMPLE. (In other words, these | 125 * extraction code like we did for JSAMPLE. (In other words, these |
132 * typedefs live at a different point on the speed/space tradeoff curve.) | 126 * typedefs live at a different point on the speed/space tradeoff curve.) |
133 */ | 127 */ |
134 | 128 |
135 #if _FX_OS_ != _FX_VXWORKS_ | 129 #if _FX_OS_ != _FX_VXWORKS_ |
136 | 130 |
137 /* UINT8 must hold at least the values 0..255. */ | 131 /* UINT8 must hold at least the values 0..255. */ |
138 | 132 |
139 #ifdef HAVE_UNSIGNED_CHAR | 133 #ifdef HAVE_UNSIGNED_CHAR |
140 typedef unsigned char UINT8; | 134 typedef unsigned char UINT8; |
141 #else /* not HAVE_UNSIGNED_CHAR */ | 135 #else /* not HAVE_UNSIGNED_CHAR */ |
142 #ifdef CHAR_IS_UNSIGNED | 136 #ifdef CHAR_IS_UNSIGNED |
143 typedef char UINT8; | 137 typedef char UINT8; |
144 #else /* not CHAR_IS_UNSIGNED */ | 138 #else /* not CHAR_IS_UNSIGNED */ |
145 typedef short UINT8; | 139 typedef short UINT8; |
146 #endif /* CHAR_IS_UNSIGNED */ | 140 #endif /* CHAR_IS_UNSIGNED */ |
147 #endif /* HAVE_UNSIGNED_CHAR */ | 141 #endif /* HAVE_UNSIGNED_CHAR */ |
148 | 142 |
149 | |
150 /* UINT16 must hold at least the values 0..65535. */ | 143 /* UINT16 must hold at least the values 0..65535. */ |
151 | 144 |
152 #ifdef HAVE_UNSIGNED_SHORT | 145 #ifdef HAVE_UNSIGNED_SHORT |
153 typedef unsigned short UINT16; | 146 typedef unsigned short UINT16; |
154 #else /* not HAVE_UNSIGNED_SHORT */ | 147 #else /* not HAVE_UNSIGNED_SHORT */ |
155 typedef unsigned int UINT16; | 148 typedef unsigned int UINT16; |
156 #endif /* HAVE_UNSIGNED_SHORT */ | 149 #endif /* HAVE_UNSIGNED_SHORT */ |
157 | 150 |
158 /* INT16 must hold at least the values -32768..32767. */ | 151 /* INT16 must hold at least the values -32768..32767. */ |
159 | 152 |
160 #ifndef XMD_H» » » /* X11/xmd.h correctly defines INT16 */ | 153 #ifndef XMD_H /* X11/xmd.h correctly defines INT16 */ |
161 typedef short INT16; | 154 typedef short INT16; |
162 #endif | 155 #endif |
163 | 156 |
164 /* INT32 must hold at least signed 32-bit values. */ | 157 /* INT32 must hold at least signed 32-bit values. */ |
165 | 158 |
166 #ifndef XMD_H» » » /* X11/xmd.h correctly defines INT32 */ | 159 #ifndef XMD_H /* X11/xmd.h correctly defines INT32 */ |
167 typedef int INT32; | 160 typedef int INT32; |
168 #endif | 161 #endif |
169 | 162 |
170 #endif | 163 #endif |
171 | 164 |
172 /* Datatype used for image dimensions. The JPEG standard only supports | 165 /* Datatype used for image dimensions. The JPEG standard only supports |
173 * images up to 64K*64K due to 16-bit fields in SOF markers. Therefore | 166 * images up to 64K*64K due to 16-bit fields in SOF markers. Therefore |
174 * "unsigned int" is sufficient on all machines. However, if you need to | 167 * "unsigned int" is sufficient on all machines. However, if you need to |
175 * handle larger images and you don't mind deviating from the spec, you | 168 * handle larger images and you don't mind deviating from the spec, you |
176 * can change this datatype. | 169 * can change this datatype. |
177 */ | 170 */ |
178 | 171 |
179 typedef unsigned int JDIMENSION; | 172 typedef unsigned int JDIMENSION; |
180 | 173 |
181 #define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */ | 174 #define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */ |
182 | |
183 | 175 |
184 /* These macros are used in all function definitions and extern declarations. | 176 /* These macros are used in all function definitions and extern declarations. |
185 * You could modify them if you need to change function linkage conventions; | 177 * You could modify them if you need to change function linkage conventions; |
186 * in particular, you'll need to do that to make the library a Windows DLL. | 178 * in particular, you'll need to do that to make the library a Windows DLL. |
187 * Another application is to make all functions global for use with debuggers | 179 * Another application is to make all functions global for use with debuggers |
188 * or code profilers that require it. | 180 * or code profilers that require it. |
189 */ | 181 */ |
190 | 182 |
191 /* a function called through method pointers: */ | 183 /* a function called through method pointers: */ |
192 #define METHODDEF(type)»» static type | 184 #define METHODDEF(type) static type |
193 /* a function used only in its module: */ | 185 /* a function used only in its module: */ |
194 #define LOCAL(type)» » static type | 186 #define LOCAL(type) static type |
195 /* a function referenced thru EXTERNs: */ | 187 /* a function referenced thru EXTERNs: */ |
196 #define GLOBAL(type)» » type | 188 #define GLOBAL(type) type |
197 | 189 |
198 #ifdef _FX_MANAGED_CODE_ | 190 #ifdef _FX_MANAGED_CODE_ |
199 #define EXTERN(type)» » extern "C" type | 191 #define EXTERN(type) extern "C" type |
200 #else | 192 #else |
201 /* a reference to a GLOBAL function: */ | 193 /* a reference to a GLOBAL function: */ |
202 #define EXTERN(type)» » extern type | 194 #define EXTERN(type) extern type |
203 #endif | 195 #endif |
204 | 196 |
205 | |
206 /* This macro is used to declare a "method", that is, a function pointer. | 197 /* This macro is used to declare a "method", that is, a function pointer. |
207 * We want to supply prototype parameters if the compiler can cope. | 198 * We want to supply prototype parameters if the compiler can cope. |
208 * Note that the arglist parameter must be parenthesized! | 199 * Note that the arglist parameter must be parenthesized! |
209 * Again, you can customize this if you need special linkage keywords. | 200 * Again, you can customize this if you need special linkage keywords. |
210 */ | 201 */ |
211 | 202 |
212 #ifdef HAVE_PROTOTYPES | 203 #ifdef HAVE_PROTOTYPES |
213 #define JMETHOD(type,methodname,arglist) type (*methodname) arglist | 204 #define JMETHOD(type, methodname, arglist) type(*methodname) arglist |
214 #else | 205 #else |
215 #define JMETHOD(type,methodname,arglist) type (*methodname) () | 206 #define JMETHOD(type, methodname, arglist) type (*methodname)() |
216 #endif | 207 #endif |
217 | 208 |
218 | |
219 /* Here is the pseudo-keyword for declaring pointers that must be "far" | 209 /* Here is the pseudo-keyword for declaring pointers that must be "far" |
220 * on 80x86 machines. Most of the specialized coding for 80x86 is handled | 210 * on 80x86 machines. Most of the specialized coding for 80x86 is handled |
221 * by just saying "FAR *" where such a pointer is needed. In a few places | 211 * by just saying "FAR *" where such a pointer is needed. In a few places |
222 * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol. | 212 * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol. |
223 */ | 213 */ |
224 | 214 |
225 #ifdef NEED_FAR_POINTERS | 215 #ifdef NEED_FAR_POINTERS |
226 #define FAR far | 216 #define FAR far |
227 #else | 217 #else |
228 //#define FAR | 218 //#define FAR |
229 #endif | 219 #endif |
230 | 220 |
231 | |
232 /* | 221 /* |
233 * On a few systems, type boolean and/or its values FALSE, TRUE may appear | 222 * On a few systems, type boolean and/or its values FALSE, TRUE may appear |
234 * in standard header files. Or you may have conflicts with application- | 223 * in standard header files. Or you may have conflicts with application- |
235 * specific header files that you want to include together with these files. | 224 * specific header files that you want to include together with these files. |
236 * Defining HAVE_BOOLEAN before including jpeglib.h should make it work. | 225 * Defining HAVE_BOOLEAN before including jpeglib.h should make it work. |
237 */ | 226 */ |
238 | 227 |
239 #ifndef HAVE_BOOLEAN | 228 #ifndef HAVE_BOOLEAN |
240 typedef int boolean; | 229 typedef int boolean; |
241 #endif | 230 #endif |
242 #ifndef FALSE» » » /* in case these macros already exist */ | 231 #ifndef FALSE /* in case these macros already exist */ |
243 #define FALSE» 0» » /* values of boolean */ | 232 #define FALSE 0 /* values of boolean */ |
244 #endif | 233 #endif |
245 #ifndef TRUE | 234 #ifndef TRUE |
246 #define TRUE» 1 | 235 #define TRUE 1 |
247 #endif | 236 #endif |
248 | 237 |
249 | |
250 /* | 238 /* |
251 * The remaining options affect code selection within the JPEG library, | 239 * The remaining options affect code selection within the JPEG library, |
252 * but they don't need to be visible to most applications using the library. | 240 * but they don't need to be visible to most applications using the library. |
253 * To minimize application namespace pollution, the symbols won't be | 241 * To minimize application namespace pollution, the symbols won't be |
254 * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined. | 242 * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined. |
255 */ | 243 */ |
256 | 244 |
257 #ifdef JPEG_INTERNALS | 245 #ifdef JPEG_INTERNALS |
258 #define JPEG_INTERNAL_OPTIONS | 246 #define JPEG_INTERNAL_OPTIONS |
259 #endif | 247 #endif |
260 | 248 |
261 #ifdef JPEG_INTERNAL_OPTIONS | 249 #ifdef JPEG_INTERNAL_OPTIONS |
262 | 250 |
263 | |
264 /* | 251 /* |
265 * These defines indicate whether to include various optional functions. | 252 * These defines indicate whether to include various optional functions. |
266 * Undefining some of these symbols will produce a smaller but less capable | 253 * Undefining some of these symbols will produce a smaller but less capable |
267 * library. Note that you can leave certain source files out of the | 254 * library. Note that you can leave certain source files out of the |
268 * compilation/linking process if you've #undef'd the corresponding symbols. | 255 * compilation/linking process if you've #undef'd the corresponding symbols. |
269 * (You may HAVE to do that if your compiler doesn't like null source files.) | 256 * (You may HAVE to do that if your compiler doesn't like null source files.) |
270 */ | 257 */ |
271 | 258 |
272 /* Arithmetic coding is unsupported for legal reasons. Complaints to IBM. */ | 259 /* Arithmetic coding is unsupported for legal reasons. Complaints to IBM. */ |
273 | 260 |
274 /* Capability options common to encoder and decoder: */ | 261 /* Capability options common to encoder and decoder: */ |
275 | 262 |
276 #define DCT_ISLOW_SUPPORTED» /* slow but accurate integer algorithm */ | 263 #define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */ |
277 #define DCT_IFAST_SUPPORTED» /* faster, less accurate integer method */ | 264 #define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */ |
278 #undef DCT_FLOAT_SUPPORTED» /* floating-point: accurate, fast on fast HW */ | 265 #undef DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */ |
279 | 266 |
280 /* Encoder capability options: */ | 267 /* Encoder capability options: */ |
281 | 268 |
282 #undef C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */ | 269 #undef C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */ |
283 #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */ | 270 #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */ |
284 #define C_PROGRESSIVE_SUPPORTED» /* Progressive JPEG? (Requires MULTISCAN)*/ | 271 #define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/ |
285 #define ENTROPY_OPT_SUPPORTED» /* Optimization of entropy coding parms? */ | 272 #define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */ |
286 /* Note: if you selected 12-bit data precision, it is dangerous to turn off | 273 /* Note: if you selected 12-bit data precision, it is dangerous to turn off |
287 * ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit | 274 * ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit |
288 * precision, so jchuff.c normally uses entropy optimization to compute | 275 * precision, so jchuff.c normally uses entropy optimization to compute |
289 * usable tables for higher precision. If you don't want to do optimization, | 276 * usable tables for higher precision. If you don't want to do optimization, |
290 * you'll have to supply different default Huffman tables. | 277 * you'll have to supply different default Huffman tables. |
291 * The exact same statements apply for progressive JPEG: the default tables | 278 * The exact same statements apply for progressive JPEG: the default tables |
292 * don't work for progressive mode. (This may get fixed, however.) | 279 * don't work for progressive mode. (This may get fixed, however.) |
293 */ | 280 */ |
294 #define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */ | 281 #define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */ |
295 | 282 |
296 /* Decoder capability options: */ | 283 /* Decoder capability options: */ |
297 | 284 |
298 #undef D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */ | 285 #undef D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */ |
299 #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */ | 286 #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */ |
300 #define D_PROGRESSIVE_SUPPORTED» /* Progressive JPEG? (Requires MULTISCAN)*/ | 287 #define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/ |
301 #define SAVE_MARKERS_SUPPORTED» /* jpeg_save_markers() needed? */ | 288 #define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */ |
302 #define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */ | 289 #define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */ |
303 #define IDCT_SCALING_SUPPORTED» /* Output rescaling via IDCT? */ | 290 #define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */ |
304 #undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */ | 291 #undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */ |
305 #define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */ | 292 #define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */ |
306 #undef QUANT_1PASS_SUPPORTED» /* 1-pass color quantization? */ | 293 #undef QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */ |
307 #undef QUANT_2PASS_SUPPORTED» /* 2-pass color quantization? */ | 294 #undef QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */ |
308 | 295 |
309 /* more capability options later, no doubt */ | 296 /* more capability options later, no doubt */ |
310 | 297 |
311 | |
312 /* | 298 /* |
313 * Ordering of RGB data in scanlines passed to or from the application. | 299 * Ordering of RGB data in scanlines passed to or from the application. |
314 * If your application wants to deal with data in the order B,G,R, just | 300 * If your application wants to deal with data in the order B,G,R, just |
315 * change these macros. You can also deal with formats such as R,G,B,X | 301 * change these macros. You can also deal with formats such as R,G,B,X |
316 * (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing | 302 * (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing |
317 * the offsets will also change the order in which colormap data is organized. | 303 * the offsets will also change the order in which colormap data is organized. |
318 * RESTRICTIONS: | 304 * RESTRICTIONS: |
319 * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats. | 305 * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats. |
320 * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not | 306 * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not |
321 * useful if you are using JPEG color spaces other than YCbCr or grayscale. | 307 * useful if you are using JPEG color spaces other than YCbCr or grayscale. |
322 * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE | 308 * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE |
323 * is not 3 (they don't understand about dummy color components!). So you | 309 * is not 3 (they don't understand about dummy color components!). So you |
324 * can't use color quantization if you change that value. | 310 * can't use color quantization if you change that value. |
325 */ | 311 */ |
326 | 312 |
327 #define RGB_RED»» 0» /* Offset of Red in an RGB scanline element */ | 313 #define RGB_RED 0 /* Offset of Red in an RGB scanline element */ |
328 #define RGB_GREEN» 1» /* Offset of Green */ | 314 #define RGB_GREEN 1 /* Offset of Green */ |
329 #define RGB_BLUE» 2» /* Offset of Blue */ | 315 #define RGB_BLUE 2 /* Offset of Blue */ |
330 #define RGB_PIXELSIZE» 3» /* JSAMPLEs per RGB scanline element */ | 316 #define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */ |
331 | |
332 | 317 |
333 /* Definitions for speed-related optimizations. */ | 318 /* Definitions for speed-related optimizations. */ |
334 | 319 |
335 | |
336 /* If your compiler supports inline functions, define INLINE | 320 /* If your compiler supports inline functions, define INLINE |
337 * as the inline keyword; otherwise define it as empty. | 321 * as the inline keyword; otherwise define it as empty. |
338 */ | 322 */ |
339 | 323 |
340 #ifndef INLINE | 324 #ifndef INLINE |
341 #ifdef __GNUC__»» » /* for instance, GNU C knows about inline */ | 325 #ifdef __GNUC__ /* for instance, GNU C knows about inline */ |
342 #define INLINE __inline__ | 326 #define INLINE __inline__ |
343 #endif | 327 #endif |
344 #ifndef INLINE | 328 #ifndef INLINE |
345 #define INLINE» » » /* default is to define it as empty */ | 329 #define INLINE /* default is to define it as empty */ |
346 #endif | 330 #endif |
347 #endif | 331 #endif |
348 | 332 |
349 | |
350 /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying | 333 /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying |
351 * two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER | 334 * two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER |
352 * as short on such a machine. MULTIPLIER must be at least 16 bits wide. | 335 * as short on such a machine. MULTIPLIER must be at least 16 bits wide. |
353 */ | 336 */ |
354 | 337 |
355 #ifndef MULTIPLIER | 338 #ifndef MULTIPLIER |
356 #define MULTIPLIER int»» /* type for fastest integer multiply */ | 339 #define MULTIPLIER int /* type for fastest integer multiply */ |
357 #endif | 340 #endif |
358 | 341 |
359 | |
360 /* FAST_FLOAT should be either float or double, whichever is done faster | 342 /* FAST_FLOAT should be either float or double, whichever is done faster |
361 * by your compiler. (Note that this type is only used in the floating point | 343 * by your compiler. (Note that this type is only used in the floating point |
362 * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.) | 344 * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.) |
363 * Typically, float is faster in ANSI C compilers, while double is faster in | 345 * Typically, float is faster in ANSI C compilers, while double is faster in |
364 * pre-ANSI compilers (because they insist on converting to double anyway). | 346 * pre-ANSI compilers (because they insist on converting to double anyway). |
365 * The code below therefore chooses float if we have ANSI-style prototypes. | 347 * The code below therefore chooses float if we have ANSI-style prototypes. |
366 */ | 348 */ |
367 | 349 |
368 #ifndef FAST_FLOAT | 350 #ifndef FAST_FLOAT |
369 #ifdef HAVE_PROTOTYPES | 351 #ifdef HAVE_PROTOTYPES |
370 #define FAST_FLOAT float | 352 #define FAST_FLOAT float |
371 #else | 353 #else |
372 #define FAST_FLOAT double | 354 #define FAST_FLOAT double |
373 #endif | 355 #endif |
374 #endif | 356 #endif |
375 | 357 |
376 #endif /* JPEG_INTERNAL_OPTIONS */ | 358 #endif /* JPEG_INTERNAL_OPTIONS */ |
OLD | NEW |