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comparison: media/libjpeg/jmorecfg.h
media/libjpeg/jmorecfg.h
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| 1 /* | |
| 2 * jmorecfg.h | |
| 3 * | |
| 4 * This file was part of the Independent JPEG Group's software: | |
| 5 * Copyright (C) 1991-1997, Thomas G. Lane. | |
| 6 * Modifications: | |
| 7 * Copyright (C) 2009, 2011, D. R. Commander. | |
| 8 * For conditions of distribution and use, see the accompanying README file. | |
| 9 * | |
| 10 * This file contains additional configuration options that customize the | |
| 11 * JPEG software for special applications or support machine-dependent | |
| 12 * optimizations. Most users will not need to touch this file. | |
| 13 */ | |
| 14 | |
| 15 #include <stdint.h> | |
| 16 | |
| 17 /* | |
| 18 * Define BITS_IN_JSAMPLE as either | |
| 19 * 8 for 8-bit sample values (the usual setting) | |
| 20 * 12 for 12-bit sample values | |
| 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! | |
| 23 * We do not support run-time selection of data precision, sorry. | |
| 24 */ | |
| 25 | |
| 26 #define BITS_IN_JSAMPLE 8 /* use 8 or 12 */ | |
| 27 | |
| 28 | |
| 29 /* | |
| 30 * 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 | |
| 32 * 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 | |
| 34 * really short on memory. (Each allowed component costs a hundred or so | |
| 35 * bytes of storage, whether actually used in an image or not.) | |
| 36 */ | |
| 37 | |
| 38 #define MAX_COMPONENTS 10 /* maximum number of image components */ | |
| 39 | |
| 40 | |
| 41 /* | |
| 42 * Basic data types. | |
| 43 * 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, | |
| 45 * 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. | |
| 47 */ | |
| 48 | |
| 49 /* Representation of a single sample (pixel element value). | |
| 50 * 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 | |
| 52 * arrays is very slow on your hardware, you might want to change these. | |
| 53 */ | |
| 54 | |
| 55 #if BITS_IN_JSAMPLE == 8 | |
| 56 /* 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. | |
| 58 */ | |
| 59 | |
| 60 #ifdef HAVE_UNSIGNED_CHAR | |
| 61 | |
| 62 typedef unsigned char JSAMPLE; | |
| 63 #define GETJSAMPLE(value) ((int) (value)) | |
| 64 | |
| 65 #else /* not HAVE_UNSIGNED_CHAR */ | |
| 66 | |
| 67 typedef char JSAMPLE; | |
| 68 #ifdef __CHAR_UNSIGNED__ | |
| 69 #define GETJSAMPLE(value) ((int) (value)) | |
| 70 #else | |
| 71 #define GETJSAMPLE(value) ((int) (value) & 0xFF) | |
| 72 #endif /* __CHAR_UNSIGNED__ */ | |
| 73 | |
| 74 #endif /* HAVE_UNSIGNED_CHAR */ | |
| 75 | |
| 76 #define MAXJSAMPLE 255 | |
| 77 #define CENTERJSAMPLE 128 | |
| 78 | |
| 79 #endif /* BITS_IN_JSAMPLE == 8 */ | |
| 80 | |
| 81 | |
| 82 #if BITS_IN_JSAMPLE == 12 | |
| 83 /* JSAMPLE should be the smallest type that will hold the values 0..4095. | |
| 84 * On nearly all machines "short" will do nicely. | |
| 85 */ | |
| 86 | |
| 87 typedef short JSAMPLE; | |
| 88 #define GETJSAMPLE(value) ((int) (value)) | |
| 89 | |
| 90 #define MAXJSAMPLE 4095 | |
| 91 #define CENTERJSAMPLE 2048 | |
| 92 | |
| 93 #endif /* BITS_IN_JSAMPLE == 12 */ | |
| 94 | |
| 95 | |
| 96 /* Representation of a DCT frequency coefficient. | |
| 97 * 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 | |
| 99 * if you have memory to burn and "short" is really slow. | |
| 100 */ | |
| 101 | |
| 102 typedef short JCOEF; | |
| 103 | |
| 104 | |
| 105 /* Compressed datastreams are represented as arrays of JOCTET. | |
| 106 * 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 | |
| 108 * managers, this is also the data type passed to fread/fwrite. | |
| 109 */ | |
| 110 | |
| 111 #ifdef HAVE_UNSIGNED_CHAR | |
| 112 | |
| 113 typedef unsigned char JOCTET; | |
| 114 #define GETJOCTET(value) (value) | |
| 115 | |
| 116 #else /* not HAVE_UNSIGNED_CHAR */ | |
| 117 | |
| 118 typedef char JOCTET; | |
| 119 #ifdef __CHAR_UNSIGNED__ | |
| 120 #define GETJOCTET(value) (value) | |
| 121 #else | |
| 122 #define GETJOCTET(value) ((value) & 0xFF) | |
| 123 #endif /* __CHAR_UNSIGNED__ */ | |
| 124 | |
| 125 #endif /* HAVE_UNSIGNED_CHAR */ | |
| 126 | |
| 127 | |
| 128 /* 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 | |
| 130 * 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 | |
| 132 * typedefs live at a different point on the speed/space tradeoff curve.) | |
| 133 */ | |
| 134 | |
| 135 /* UINT8 must hold at least the values 0..255. */ | |
| 136 | |
| 137 typedef uint8_t UINT8; | |
| 138 | |
| 139 /* UINT16 must hold at least the values 0..65535. */ | |
| 140 | |
| 141 typedef uint16_t UINT16; | |
| 142 | |
| 143 /* INT16 must hold at least the values -32768..32767. */ | |
| 144 | |
| 145 typedef int16_t INT16; | |
| 146 | |
| 147 /* INT32 must hold at least signed 32-bit values. */ | |
| 148 | |
| 149 typedef int32_t INT32; | |
| 150 | |
| 151 /* Datatype used for image dimensions. The JPEG standard only supports | |
| 152 * images up to 64K*64K due to 16-bit fields in SOF markers. Therefore | |
| 153 * "unsigned int" is sufficient on all machines. However, if you need to | |
| 154 * handle larger images and you don't mind deviating from the spec, you | |
| 155 * can change this datatype. | |
| 156 */ | |
| 157 | |
| 158 typedef unsigned int JDIMENSION; | |
| 159 | |
| 160 #define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */ | |
| 161 | |
| 162 | |
| 163 /* These macros are used in all function definitions and extern declarations. | |
| 164 * You could modify them if you need to change function linkage conventions; | |
| 165 * in particular, you'll need to do that to make the library a Windows DLL. | |
| 166 * Another application is to make all functions global for use with debuggers | |
| 167 * or code profilers that require it. | |
| 168 */ | |
| 169 | |
| 170 /* a function called through method pointers: */ | |
| 171 #define METHODDEF(type) static type | |
| 172 /* a function used only in its module: */ | |
| 173 #define LOCAL(type) static type | |
| 174 /* a function referenced thru EXTERNs: */ | |
| 175 #define GLOBAL(type) type | |
| 176 /* a reference to a GLOBAL function: */ | |
| 177 #define EXTERN(type) extern type | |
| 178 | |
| 179 | |
| 180 /* This macro is used to declare a "method", that is, a function pointer. | |
| 181 * We want to supply prototype parameters if the compiler can cope. | |
| 182 * Note that the arglist parameter must be parenthesized! | |
| 183 * Again, you can customize this if you need special linkage keywords. | |
| 184 */ | |
| 185 | |
| 186 #ifdef HAVE_PROTOTYPES | |
| 187 #define JMETHOD(type,methodname,arglist) type (*methodname) arglist | |
| 188 #else | |
| 189 #define JMETHOD(type,methodname,arglist) type (*methodname) () | |
| 190 #endif | |
| 191 | |
| 192 | |
| 193 /* Here is the pseudo-keyword for declaring pointers that must be "far" | |
| 194 * on 80x86 machines. Most of the specialized coding for 80x86 is handled | |
| 195 * by just saying "FAR *" where such a pointer is needed. In a few places | |
| 196 * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol. | |
| 197 */ | |
| 198 | |
| 199 #ifdef NEED_FAR_POINTERS | |
| 200 #ifndef FAR | |
| 201 #define FAR far | |
| 202 #endif | |
| 203 #else | |
| 204 #undef FAR | |
| 205 #define FAR | |
| 206 #endif | |
| 207 | |
| 208 | |
| 209 /* | |
| 210 * On a few systems, type boolean and/or its values FALSE, TRUE may appear | |
| 211 * in standard header files. Or you may have conflicts with application- | |
| 212 * specific header files that you want to include together with these files. | |
| 213 * Defining HAVE_BOOLEAN before including jpeglib.h should make it work. | |
| 214 */ | |
| 215 | |
| 216 #ifndef HAVE_BOOLEAN | |
| 217 typedef int boolean; | |
| 218 #endif | |
| 219 #ifndef FALSE /* in case these macros already exist */ | |
| 220 #define FALSE 0 /* values of boolean */ | |
| 221 #endif | |
| 222 #ifndef TRUE | |
| 223 #define TRUE 1 | |
| 224 #endif | |
| 225 | |
| 226 | |
| 227 /* | |
| 228 * The remaining options affect code selection within the JPEG library, | |
| 229 * but they don't need to be visible to most applications using the library. | |
| 230 * To minimize application namespace pollution, the symbols won't be | |
| 231 * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined. | |
| 232 */ | |
| 233 | |
| 234 #ifdef JPEG_INTERNALS | |
| 235 #define JPEG_INTERNAL_OPTIONS | |
| 236 #endif | |
| 237 | |
| 238 #ifdef JPEG_INTERNAL_OPTIONS | |
| 239 | |
| 240 | |
| 241 /* | |
| 242 * These defines indicate whether to include various optional functions. | |
| 243 * Undefining some of these symbols will produce a smaller but less capable | |
| 244 * library. Note that you can leave certain source files out of the | |
| 245 * compilation/linking process if you've #undef'd the corresponding symbols. | |
| 246 * (You may HAVE to do that if your compiler doesn't like null source files.) | |
| 247 */ | |
| 248 | |
| 249 /* Capability options common to encoder and decoder: */ | |
| 250 | |
| 251 #define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */ | |
| 252 #define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */ | |
| 253 #define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */ | |
| 254 | |
| 255 /* Encoder capability options: */ | |
| 256 | |
| 257 #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */ | |
| 258 #define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/ | |
| 259 #define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */ | |
| 260 /* Note: if you selected 12-bit data precision, it is dangerous to turn off | |
| 261 * ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit | |
| 262 * precision, so jchuff.c normally uses entropy optimization to compute | |
| 263 * usable tables for higher precision. If you don't want to do optimization, | |
| 264 * you'll have to supply different default Huffman tables. | |
| 265 * The exact same statements apply for progressive JPEG: the default tables | |
| 266 * don't work for progressive mode. (This may get fixed, however.) | |
| 267 */ | |
| 268 #define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */ | |
| 269 | |
| 270 /* Decoder capability options: */ | |
| 271 | |
| 272 #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */ | |
| 273 #define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/ | |
| 274 #define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */ | |
| 275 #define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */ | |
| 276 #define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */ | |
| 277 #undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */ | |
| 278 #define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */ | |
| 279 #define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */ | |
| 280 #define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */ | |
| 281 | |
| 282 /* more capability options later, no doubt */ | |
| 283 | |
| 284 | |
| 285 /* | |
| 286 * Ordering of RGB data in scanlines passed to or from the application. | |
| 287 * If your application wants to deal with data in the order B,G,R, just | |
| 288 * change these macros. You can also deal with formats such as R,G,B,X | |
| 289 * (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing | |
| 290 * the offsets will also change the order in which colormap data is organized. | |
| 291 * RESTRICTIONS: | |
| 292 * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats. | |
| 293 * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not | |
| 294 * useful if you are using JPEG color spaces other than YCbCr or grayscale. | |
| 295 * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE | |
| 296 * is not 3 (they don't understand about dummy color components!). So you | |
| 297 * can't use color quantization if you change that value. | |
| 298 */ | |
| 299 | |
| 300 #define RGB_RED 0 /* Offset of Red in an RGB scanline element */ | |
| 301 #define RGB_GREEN 1 /* Offset of Green */ | |
| 302 #define RGB_BLUE 2 /* Offset of Blue */ | |
| 303 #define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */ | |
| 304 | |
| 305 #define JPEG_NUMCS 16 | |
| 306 | |
| 307 #define EXT_RGB_RED 0 | |
| 308 #define EXT_RGB_GREEN 1 | |
| 309 #define EXT_RGB_BLUE 2 | |
| 310 #define EXT_RGB_PIXELSIZE 3 | |
| 311 | |
| 312 #define EXT_RGBX_RED 0 | |
| 313 #define EXT_RGBX_GREEN 1 | |
| 314 #define EXT_RGBX_BLUE 2 | |
| 315 #define EXT_RGBX_PIXELSIZE 4 | |
| 316 | |
| 317 #define EXT_BGR_RED 2 | |
| 318 #define EXT_BGR_GREEN 1 | |
| 319 #define EXT_BGR_BLUE 0 | |
| 320 #define EXT_BGR_PIXELSIZE 3 | |
| 321 | |
| 322 #define EXT_BGRX_RED 2 | |
| 323 #define EXT_BGRX_GREEN 1 | |
| 324 #define EXT_BGRX_BLUE 0 | |
| 325 #define EXT_BGRX_PIXELSIZE 4 | |
| 326 | |
| 327 #define EXT_XBGR_RED 3 | |
| 328 #define EXT_XBGR_GREEN 2 | |
| 329 #define EXT_XBGR_BLUE 1 | |
| 330 #define EXT_XBGR_PIXELSIZE 4 | |
| 331 | |
| 332 #define EXT_XRGB_RED 1 | |
| 333 #define EXT_XRGB_GREEN 2 | |
| 334 #define EXT_XRGB_BLUE 3 | |
| 335 #define EXT_XRGB_PIXELSIZE 4 | |
| 336 | |
| 337 static const int rgb_red[JPEG_NUMCS] = { | |
| 338 -1, -1, RGB_RED, -1, -1, -1, EXT_RGB_RED, EXT_RGBX_RED, | |
| 339 EXT_BGR_RED, EXT_BGRX_RED, EXT_XBGR_RED, EXT_XRGB_RED, | |
| 340 EXT_RGBX_RED, EXT_BGRX_RED, EXT_XBGR_RED, EXT_XRGB_RED | |
| 341 }; | |
| 342 | |
| 343 static const int rgb_green[JPEG_NUMCS] = { | |
| 344 -1, -1, RGB_GREEN, -1, -1, -1, EXT_RGB_GREEN, EXT_RGBX_GREEN, | |
| 345 EXT_BGR_GREEN, EXT_BGRX_GREEN, EXT_XBGR_GREEN, EXT_XRGB_GREEN, | |
| 346 EXT_RGBX_GREEN, EXT_BGRX_GREEN, EXT_XBGR_GREEN, EXT_XRGB_GREEN | |
| 347 }; | |
| 348 | |
| 349 static const int rgb_blue[JPEG_NUMCS] = { | |
| 350 -1, -1, RGB_BLUE, -1, -1, -1, EXT_RGB_BLUE, EXT_RGBX_BLUE, | |
| 351 EXT_BGR_BLUE, EXT_BGRX_BLUE, EXT_XBGR_BLUE, EXT_XRGB_BLUE, | |
| 352 EXT_RGBX_BLUE, EXT_BGRX_BLUE, EXT_XBGR_BLUE, EXT_XRGB_BLUE | |
| 353 }; | |
| 354 | |
| 355 static const int rgb_pixelsize[JPEG_NUMCS] = { | |
| 356 -1, -1, RGB_PIXELSIZE, -1, -1, -1, EXT_RGB_PIXELSIZE, EXT_RGBX_PIXELSIZE, | |
| 357 EXT_BGR_PIXELSIZE, EXT_BGRX_PIXELSIZE, EXT_XBGR_PIXELSIZE, EXT_XRGB_PIXELSIZE, | |
| 358 EXT_RGBX_PIXELSIZE, EXT_BGRX_PIXELSIZE, EXT_XBGR_PIXELSIZE, EXT_XRGB_PIXELSIZE | |
| 359 }; | |
| 360 | |
| 361 /* Definitions for speed-related optimizations. */ | |
| 362 | |
| 363 /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying | |
| 364 * two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER | |
| 365 * as short on such a machine. MULTIPLIER must be at least 16 bits wide. | |
| 366 */ | |
| 367 | |
| 368 #ifndef MULTIPLIER | |
| 369 #ifndef WITH_SIMD | |
| 370 #define MULTIPLIER int /* type for fastest integer multiply */ | |
| 371 #else | |
| 372 #define MULTIPLIER short /* prefer 16-bit with SIMD for parellelism */ | |
| 373 #endif | |
| 374 #endif | |
| 375 | |
| 376 | |
| 377 /* FAST_FLOAT should be either float or double, whichever is done faster | |
| 378 * by your compiler. (Note that this type is only used in the floating point | |
| 379 * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.) | |
| 380 * Typically, float is faster in ANSI C compilers, while double is faster in | |
| 381 * pre-ANSI compilers (because they insist on converting to double anyway). | |
| 382 * The code below therefore chooses float if we have ANSI-style prototypes. | |
| 383 */ | |
| 384 | |
| 385 #ifndef FAST_FLOAT | |
| 386 #ifdef HAVE_PROTOTYPES | |
| 387 #define FAST_FLOAT float | |
| 388 #else | |
| 389 #define FAST_FLOAT double | |
| 390 #endif | |
| 391 #endif | |
| 392 | |
| 393 #endif /* JPEG_INTERNAL_OPTIONS */ |
