| 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 |