Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jmorecfg.h |
| 3 | * |
DRC | a73e870 | 2012-12-31 02:52:30 +0000 | [diff] [blame] | 4 | * This file was part of the Independent JPEG Group's software: |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 5 | * Copyright (C) 1991-1997, Thomas G. Lane. |
DRC | c23e36e | 2015-07-06 16:04:04 +0000 | [diff] [blame] | 6 | * Modified 1997-2009 by Guido Vollbeding. |
DRC | da13af6 | 2014-05-18 17:52:06 +0000 | [diff] [blame] | 7 | * libjpeg-turbo Modifications: |
DRC | 8e9cef2 | 2015-09-21 12:57:41 -0500 | [diff] [blame] | 8 | * Copyright (C) 2009, 2011, 2014-2015, D. R. Commander. |
DRC | 7e3acc0 | 2015-10-10 10:25:46 -0500 | [diff] [blame] | 9 | * For conditions of distribution and use, see the accompanying README.ijg |
| 10 | * file. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 11 | * |
| 12 | * This file contains additional configuration options that customize the |
| 13 | * JPEG software for special applications or support machine-dependent |
| 14 | * optimizations. Most users will not need to touch this file. |
| 15 | */ |
| 16 | |
| 17 | |
| 18 | /* |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 19 | * Maximum number of components (color channels) allowed in JPEG image. |
| 20 | * To meet the letter of the JPEG spec, set this to 255. However, darn |
| 21 | * few applications need more than 4 channels (maybe 5 for CMYK + alpha |
| 22 | * mask). We recommend 10 as a reasonable compromise; use 4 if you are |
| 23 | * really short on memory. (Each allowed component costs a hundred or so |
| 24 | * bytes of storage, whether actually used in an image or not.) |
| 25 | */ |
| 26 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 27 | #define MAX_COMPONENTS 10 /* maximum number of image components */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 28 | |
| 29 | |
| 30 | /* |
| 31 | * Basic data types. |
| 32 | * You may need to change these if you have a machine with unusual data |
| 33 | * type sizes; for example, "char" not 8 bits, "short" not 16 bits, |
| 34 | * or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits, |
| 35 | * but it had better be at least 16. |
| 36 | */ |
| 37 | |
| 38 | /* Representation of a single sample (pixel element value). |
| 39 | * We frequently allocate large arrays of these, so it's important to keep |
| 40 | * them small. But if you have memory to burn and access to char or short |
| 41 | * arrays is very slow on your hardware, you might want to change these. |
| 42 | */ |
| 43 | |
| 44 | #if BITS_IN_JSAMPLE == 8 |
| 45 | /* JSAMPLE should be the smallest type that will hold the values 0..255. |
| 46 | * You can use a signed char by having GETJSAMPLE mask it with 0xFF. |
| 47 | */ |
| 48 | |
| 49 | #ifdef HAVE_UNSIGNED_CHAR |
| 50 | |
| 51 | typedef unsigned char JSAMPLE; |
| 52 | #define GETJSAMPLE(value) ((int) (value)) |
| 53 | |
| 54 | #else /* not HAVE_UNSIGNED_CHAR */ |
| 55 | |
| 56 | typedef char JSAMPLE; |
Constantin Kaplinsky | 0ca4425 | 2008-09-28 05:08:48 +0000 | [diff] [blame] | 57 | #ifdef __CHAR_UNSIGNED__ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 58 | #define GETJSAMPLE(value) ((int) (value)) |
| 59 | #else |
| 60 | #define GETJSAMPLE(value) ((int) (value) & 0xFF) |
Constantin Kaplinsky | 0ca4425 | 2008-09-28 05:08:48 +0000 | [diff] [blame] | 61 | #endif /* __CHAR_UNSIGNED__ */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 62 | |
| 63 | #endif /* HAVE_UNSIGNED_CHAR */ |
| 64 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 65 | #define MAXJSAMPLE 255 |
| 66 | #define CENTERJSAMPLE 128 |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 67 | |
| 68 | #endif /* BITS_IN_JSAMPLE == 8 */ |
| 69 | |
| 70 | |
| 71 | #if BITS_IN_JSAMPLE == 12 |
| 72 | /* JSAMPLE should be the smallest type that will hold the values 0..4095. |
| 73 | * On nearly all machines "short" will do nicely. |
| 74 | */ |
| 75 | |
| 76 | typedef short JSAMPLE; |
| 77 | #define GETJSAMPLE(value) ((int) (value)) |
| 78 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 79 | #define MAXJSAMPLE 4095 |
| 80 | #define CENTERJSAMPLE 2048 |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 81 | |
| 82 | #endif /* BITS_IN_JSAMPLE == 12 */ |
| 83 | |
| 84 | |
| 85 | /* Representation of a DCT frequency coefficient. |
| 86 | * This should be a signed value of at least 16 bits; "short" is usually OK. |
| 87 | * Again, we allocate large arrays of these, but you can change to int |
| 88 | * if you have memory to burn and "short" is really slow. |
| 89 | */ |
| 90 | |
| 91 | typedef short JCOEF; |
| 92 | |
| 93 | |
| 94 | /* Compressed datastreams are represented as arrays of JOCTET. |
| 95 | * These must be EXACTLY 8 bits wide, at least once they are written to |
| 96 | * external storage. Note that when using the stdio data source/destination |
| 97 | * managers, this is also the data type passed to fread/fwrite. |
| 98 | */ |
| 99 | |
| 100 | #ifdef HAVE_UNSIGNED_CHAR |
| 101 | |
| 102 | typedef unsigned char JOCTET; |
| 103 | #define GETJOCTET(value) (value) |
| 104 | |
| 105 | #else /* not HAVE_UNSIGNED_CHAR */ |
| 106 | |
| 107 | typedef char JOCTET; |
Constantin Kaplinsky | 0ca4425 | 2008-09-28 05:08:48 +0000 | [diff] [blame] | 108 | #ifdef __CHAR_UNSIGNED__ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 109 | #define GETJOCTET(value) (value) |
| 110 | #else |
| 111 | #define GETJOCTET(value) ((value) & 0xFF) |
Constantin Kaplinsky | 0ca4425 | 2008-09-28 05:08:48 +0000 | [diff] [blame] | 112 | #endif /* __CHAR_UNSIGNED__ */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 113 | |
| 114 | #endif /* HAVE_UNSIGNED_CHAR */ |
| 115 | |
| 116 | |
| 117 | /* These typedefs are used for various table entries and so forth. |
| 118 | * They must be at least as wide as specified; but making them too big |
| 119 | * won't cost a huge amount of memory, so we don't provide special |
| 120 | * extraction code like we did for JSAMPLE. (In other words, these |
| 121 | * typedefs live at a different point on the speed/space tradeoff curve.) |
| 122 | */ |
| 123 | |
| 124 | /* UINT8 must hold at least the values 0..255. */ |
| 125 | |
| 126 | #ifdef HAVE_UNSIGNED_CHAR |
| 127 | typedef unsigned char UINT8; |
| 128 | #else /* not HAVE_UNSIGNED_CHAR */ |
Constantin Kaplinsky | 0ca4425 | 2008-09-28 05:08:48 +0000 | [diff] [blame] | 129 | #ifdef __CHAR_UNSIGNED__ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 130 | typedef char UINT8; |
Constantin Kaplinsky | 0ca4425 | 2008-09-28 05:08:48 +0000 | [diff] [blame] | 131 | #else /* not __CHAR_UNSIGNED__ */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 132 | typedef short UINT8; |
Constantin Kaplinsky | 0ca4425 | 2008-09-28 05:08:48 +0000 | [diff] [blame] | 133 | #endif /* __CHAR_UNSIGNED__ */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 134 | #endif /* HAVE_UNSIGNED_CHAR */ |
| 135 | |
| 136 | /* UINT16 must hold at least the values 0..65535. */ |
| 137 | |
| 138 | #ifdef HAVE_UNSIGNED_SHORT |
| 139 | typedef unsigned short UINT16; |
| 140 | #else /* not HAVE_UNSIGNED_SHORT */ |
| 141 | typedef unsigned int UINT16; |
| 142 | #endif /* HAVE_UNSIGNED_SHORT */ |
| 143 | |
| 144 | /* INT16 must hold at least the values -32768..32767. */ |
| 145 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 146 | #ifndef XMD_H /* X11/xmd.h correctly defines INT16 */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 147 | typedef short INT16; |
| 148 | #endif |
| 149 | |
DRC | 1e32fe3 | 2015-10-14 17:32:39 -0500 | [diff] [blame^] | 150 | /* INT32 must hold at least signed 32-bit values. |
| 151 | * |
| 152 | * NOTE: The INT32 typedef dates back to libjpeg v5 (1994.) Integers were |
| 153 | * sometimes 16-bit back then (MS-DOS), which is why INT32 is typedef'd to |
| 154 | * long. It also wasn't common (or at least as common) in 1994 for INT32 to be |
| 155 | * defined by platform headers. Since then, however, INT32 is defined in |
| 156 | * several other common places: |
| 157 | * |
| 158 | * Xmd.h (X11 header) typedefs INT32 to int on 64-bit platforms and long on |
| 159 | * 32-bit platforms (i.e always a 32-bit signed type.) |
| 160 | * |
| 161 | * basetsd.h (Win32 header) typedefs INT32 to int (always a 32-bit signed type |
| 162 | * on modern platforms.) |
| 163 | * |
| 164 | * qglobal.h (Qt header) typedefs INT32 to int (always a 32-bit signed type on |
| 165 | * modern platforms.) |
| 166 | * |
| 167 | * This is a recipe for conflict, since "long" and "int" aren't always |
| 168 | * compatible types. Since the definition of INT32 has technically been part |
| 169 | * of the libjpeg API for more than 20 years, we can't remove it, but we do not |
| 170 | * use it internally any longer. We instead define a separate type (JLONG) |
| 171 | * for internal use, which ensures that internal behavior will always be the |
| 172 | * same regardless of any external headers that may be included. |
| 173 | */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 174 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 175 | #ifndef XMD_H /* X11/xmd.h correctly defines INT32 */ |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 176 | #ifndef _BASETSD_H_ /* Microsoft defines it in basetsd.h */ |
Guido Vollbeding | 989630f | 2010-01-10 00:00:00 +0000 | [diff] [blame] | 177 | #ifndef _BASETSD_H /* MinGW is slightly different */ |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 178 | #ifndef QGLOBAL_H /* Qt defines it in qglobal.h */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 179 | typedef long INT32; |
| 180 | #endif |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 181 | #endif |
| 182 | #endif |
Guido Vollbeding | 989630f | 2010-01-10 00:00:00 +0000 | [diff] [blame] | 183 | #endif |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 184 | |
| 185 | /* Datatype used for image dimensions. The JPEG standard only supports |
| 186 | * images up to 64K*64K due to 16-bit fields in SOF markers. Therefore |
| 187 | * "unsigned int" is sufficient on all machines. However, if you need to |
| 188 | * handle larger images and you don't mind deviating from the spec, you |
Chandler Carruth | 498d9bc | 2015-09-15 11:57:03 -0700 | [diff] [blame] | 189 | * can change this datatype. (Note that changing this datatype will |
| 190 | * potentially require modifying the SIMD code. The x86-64 SIMD extensions, |
| 191 | * in particular, assume a 32-bit JDIMENSION.) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 192 | */ |
| 193 | |
| 194 | typedef unsigned int JDIMENSION; |
| 195 | |
| 196 | #define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */ |
| 197 | |
| 198 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 199 | /* These macros are used in all function definitions and extern declarations. |
| 200 | * You could modify them if you need to change function linkage conventions; |
| 201 | * in particular, you'll need to do that to make the library a Windows DLL. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 202 | * Another application is to make all functions global for use with debuggers |
| 203 | * or code profilers that require it. |
| 204 | */ |
| 205 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 206 | /* a function called through method pointers: */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 207 | #define METHODDEF(type) static type |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 208 | /* a function used only in its module: */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 209 | #define LOCAL(type) static type |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 210 | /* a function referenced thru EXTERNs: */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 211 | #define GLOBAL(type) type |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 212 | /* a reference to a GLOBAL function: */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 213 | #define EXTERN(type) extern type |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 214 | |
| 215 | |
DRC | e2dd3e3 | 2014-11-25 09:48:15 +0000 | [diff] [blame] | 216 | /* Originally, this macro was used as a way of defining function prototypes |
| 217 | * for both modern compilers as well as older compilers that did not support |
DRC | 2a6b831 | 2014-11-25 10:07:43 +0000 | [diff] [blame] | 218 | * prototype parameters. libjpeg-turbo has never supported these older, |
| 219 | * non-ANSI compilers, but the macro is still included because there is some |
| 220 | * software out there that uses it. |
DRC | e2dd3e3 | 2014-11-25 09:48:15 +0000 | [diff] [blame] | 221 | */ |
| 222 | |
| 223 | #define JMETHOD(type,methodname,arglist) type (*methodname) arglist |
| 224 | |
| 225 | |
DRC | 2a6b831 | 2014-11-25 10:07:43 +0000 | [diff] [blame] | 226 | /* libjpeg-turbo no longer supports platforms that have far symbols (MS-DOS), |
| 227 | * but again, some software relies on this macro. |
| 228 | */ |
| 229 | |
| 230 | #undef FAR |
| 231 | #define FAR |
| 232 | |
| 233 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 234 | /* |
| 235 | * On a few systems, type boolean and/or its values FALSE, TRUE may appear |
| 236 | * in standard header files. Or you may have conflicts with application- |
| 237 | * specific header files that you want to include together with these files. |
| 238 | * Defining HAVE_BOOLEAN before including jpeglib.h should make it work. |
| 239 | */ |
| 240 | |
| 241 | #ifndef HAVE_BOOLEAN |
| 242 | typedef int boolean; |
| 243 | #endif |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 244 | #ifndef FALSE /* in case these macros already exist */ |
| 245 | #define FALSE 0 /* values of boolean */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 246 | #endif |
| 247 | #ifndef TRUE |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 248 | #define TRUE 1 |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 249 | #endif |
| 250 | |
| 251 | |
| 252 | /* |
| 253 | * The remaining options affect code selection within the JPEG library, |
| 254 | * but they don't need to be visible to most applications using the library. |
| 255 | * To minimize application namespace pollution, the symbols won't be |
| 256 | * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined. |
| 257 | */ |
| 258 | |
| 259 | #ifdef JPEG_INTERNALS |
| 260 | #define JPEG_INTERNAL_OPTIONS |
| 261 | #endif |
| 262 | |
| 263 | #ifdef JPEG_INTERNAL_OPTIONS |
| 264 | |
| 265 | |
| 266 | /* |
| 267 | * These defines indicate whether to include various optional functions. |
| 268 | * Undefining some of these symbols will produce a smaller but less capable |
| 269 | * library. Note that you can leave certain source files out of the |
| 270 | * compilation/linking process if you've #undef'd the corresponding symbols. |
| 271 | * (You may HAVE to do that if your compiler doesn't like null source files.) |
| 272 | */ |
| 273 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 274 | /* Capability options common to encoder and decoder: */ |
| 275 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 276 | #define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */ |
| 277 | #define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */ |
| 278 | #define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 279 | |
| 280 | /* Encoder capability options: */ |
| 281 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 282 | #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 283 | #define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/ |
| 284 | #define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 285 | /* Note: if you selected 12-bit data precision, it is dangerous to turn off |
| 286 | * ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit |
| 287 | * precision, so jchuff.c normally uses entropy optimization to compute |
| 288 | * usable tables for higher precision. If you don't want to do optimization, |
| 289 | * you'll have to supply different default Huffman tables. |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 290 | * The exact same statements apply for progressive JPEG: the default tables |
| 291 | * don't work for progressive mode. (This may get fixed, however.) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 292 | */ |
| 293 | #define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */ |
| 294 | |
| 295 | /* Decoder capability options: */ |
| 296 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 297 | #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 298 | #define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/ |
| 299 | #define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 300 | #define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 301 | #define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 302 | #undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */ |
| 303 | #define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 304 | #define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */ |
| 305 | #define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 306 | |
| 307 | /* more capability options later, no doubt */ |
| 308 | |
| 309 | |
| 310 | /* |
DRC | 976fd96 | 2014-05-13 18:41:33 +0000 | [diff] [blame] | 311 | * The RGB_RED, RGB_GREEN, RGB_BLUE, and RGB_PIXELSIZE macros are a vestigial |
| 312 | * feature of libjpeg. The idea was that, if an application developer needed |
| 313 | * to compress from/decompress to a BGR/BGRX/RGBX/XBGR/XRGB buffer, they could |
| 314 | * change these macros, rebuild libjpeg, and link their application statically |
| 315 | * with it. In reality, few people ever did this, because there were some |
| 316 | * severe restrictions involved (cjpeg and djpeg no longer worked properly, |
| 317 | * compressing/decompressing RGB JPEGs no longer worked properly, and the color |
| 318 | * quantizer wouldn't work with pixel sizes other than 3.) Further, since all |
| 319 | * of the O/S-supplied versions of libjpeg were built with the default values |
| 320 | * of RGB_RED, RGB_GREEN, RGB_BLUE, and RGB_PIXELSIZE, many applications have |
| 321 | * come to regard these values as immutable. |
| 322 | * |
| 323 | * The libjpeg-turbo colorspace extensions provide a much cleaner way of |
| 324 | * compressing from/decompressing to buffers with arbitrary component orders |
| 325 | * and pixel sizes. Thus, we do not support changing the values of RGB_RED, |
| 326 | * RGB_GREEN, RGB_BLUE, or RGB_PIXELSIZE. In addition to the restrictions |
| 327 | * listed above, changing these values will also break the SIMD extensions and |
| 328 | * the regression tests. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 329 | */ |
| 330 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 331 | #define RGB_RED 0 /* Offset of Red in an RGB scanline element */ |
| 332 | #define RGB_GREEN 1 /* Offset of Green */ |
| 333 | #define RGB_BLUE 2 /* Offset of Blue */ |
| 334 | #define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 335 | |
DRC | 78df2e6 | 2014-05-12 09:23:57 +0000 | [diff] [blame] | 336 | #define JPEG_NUMCS 17 |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 337 | |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 338 | #define EXT_RGB_RED 0 |
| 339 | #define EXT_RGB_GREEN 1 |
| 340 | #define EXT_RGB_BLUE 2 |
| 341 | #define EXT_RGB_PIXELSIZE 3 |
| 342 | |
| 343 | #define EXT_RGBX_RED 0 |
| 344 | #define EXT_RGBX_GREEN 1 |
| 345 | #define EXT_RGBX_BLUE 2 |
| 346 | #define EXT_RGBX_PIXELSIZE 4 |
| 347 | |
| 348 | #define EXT_BGR_RED 2 |
| 349 | #define EXT_BGR_GREEN 1 |
| 350 | #define EXT_BGR_BLUE 0 |
| 351 | #define EXT_BGR_PIXELSIZE 3 |
| 352 | |
| 353 | #define EXT_BGRX_RED 2 |
| 354 | #define EXT_BGRX_GREEN 1 |
| 355 | #define EXT_BGRX_BLUE 0 |
| 356 | #define EXT_BGRX_PIXELSIZE 4 |
| 357 | |
| 358 | #define EXT_XBGR_RED 3 |
| 359 | #define EXT_XBGR_GREEN 2 |
| 360 | #define EXT_XBGR_BLUE 1 |
| 361 | #define EXT_XBGR_PIXELSIZE 4 |
| 362 | |
| 363 | #define EXT_XRGB_RED 1 |
| 364 | #define EXT_XRGB_GREEN 2 |
| 365 | #define EXT_XRGB_BLUE 3 |
| 366 | #define EXT_XRGB_PIXELSIZE 4 |
| 367 | |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 368 | static const int rgb_red[JPEG_NUMCS] = { |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 369 | -1, -1, RGB_RED, -1, -1, -1, EXT_RGB_RED, EXT_RGBX_RED, |
DRC | 67ce3b2 | 2011-12-19 02:21:03 +0000 | [diff] [blame] | 370 | EXT_BGR_RED, EXT_BGRX_RED, EXT_XBGR_RED, EXT_XRGB_RED, |
DRC | 78df2e6 | 2014-05-12 09:23:57 +0000 | [diff] [blame] | 371 | EXT_RGBX_RED, EXT_BGRX_RED, EXT_XBGR_RED, EXT_XRGB_RED, |
| 372 | -1 |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 373 | }; |
| 374 | |
| 375 | static const int rgb_green[JPEG_NUMCS] = { |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 376 | -1, -1, RGB_GREEN, -1, -1, -1, EXT_RGB_GREEN, EXT_RGBX_GREEN, |
DRC | 67ce3b2 | 2011-12-19 02:21:03 +0000 | [diff] [blame] | 377 | EXT_BGR_GREEN, EXT_BGRX_GREEN, EXT_XBGR_GREEN, EXT_XRGB_GREEN, |
DRC | 78df2e6 | 2014-05-12 09:23:57 +0000 | [diff] [blame] | 378 | EXT_RGBX_GREEN, EXT_BGRX_GREEN, EXT_XBGR_GREEN, EXT_XRGB_GREEN, |
| 379 | -1 |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 380 | }; |
| 381 | |
| 382 | static const int rgb_blue[JPEG_NUMCS] = { |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 383 | -1, -1, RGB_BLUE, -1, -1, -1, EXT_RGB_BLUE, EXT_RGBX_BLUE, |
DRC | 67ce3b2 | 2011-12-19 02:21:03 +0000 | [diff] [blame] | 384 | EXT_BGR_BLUE, EXT_BGRX_BLUE, EXT_XBGR_BLUE, EXT_XRGB_BLUE, |
DRC | 78df2e6 | 2014-05-12 09:23:57 +0000 | [diff] [blame] | 385 | EXT_RGBX_BLUE, EXT_BGRX_BLUE, EXT_XBGR_BLUE, EXT_XRGB_BLUE, |
| 386 | -1 |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 387 | }; |
| 388 | |
| 389 | static const int rgb_pixelsize[JPEG_NUMCS] = { |
DRC | b4570bb | 2011-09-07 06:31:00 +0000 | [diff] [blame] | 390 | -1, -1, RGB_PIXELSIZE, -1, -1, -1, EXT_RGB_PIXELSIZE, EXT_RGBX_PIXELSIZE, |
DRC | 67ce3b2 | 2011-12-19 02:21:03 +0000 | [diff] [blame] | 391 | EXT_BGR_PIXELSIZE, EXT_BGRX_PIXELSIZE, EXT_XBGR_PIXELSIZE, EXT_XRGB_PIXELSIZE, |
DRC | 78df2e6 | 2014-05-12 09:23:57 +0000 | [diff] [blame] | 392 | EXT_RGBX_PIXELSIZE, EXT_BGRX_PIXELSIZE, EXT_XBGR_PIXELSIZE, EXT_XRGB_PIXELSIZE, |
| 393 | -1 |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 394 | }; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 395 | |
| 396 | /* Definitions for speed-related optimizations. */ |
| 397 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 398 | /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying |
| 399 | * two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER |
| 400 | * as short on such a machine. MULTIPLIER must be at least 16 bits wide. |
| 401 | */ |
| 402 | |
| 403 | #ifndef MULTIPLIER |
Pierre Ossman | 5eb84ff | 2009-03-09 13:25:30 +0000 | [diff] [blame] | 404 | #ifndef WITH_SIMD |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 405 | #define MULTIPLIER int /* type for fastest integer multiply */ |
Pierre Ossman | 5eb84ff | 2009-03-09 13:25:30 +0000 | [diff] [blame] | 406 | #else |
| 407 | #define MULTIPLIER short /* prefer 16-bit with SIMD for parellelism */ |
| 408 | #endif |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 409 | #endif |
| 410 | |
| 411 | |
| 412 | /* FAST_FLOAT should be either float or double, whichever is done faster |
| 413 | * by your compiler. (Note that this type is only used in the floating point |
| 414 | * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 415 | */ |
| 416 | |
| 417 | #ifndef FAST_FLOAT |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 418 | #define FAST_FLOAT float |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 419 | #endif |
| 420 | |
| 421 | #endif /* JPEG_INTERNAL_OPTIONS */ |