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annotate libs/libjpeg/jmorecfg.h @ 2:334d17aed7de

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author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 02 Feb 2014 18:36:38 +0200
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nuclear@0 1 /*
nuclear@0 2 * jmorecfg.h
nuclear@0 3 *
nuclear@0 4 * Copyright (C) 1991-1997, Thomas G. Lane.
nuclear@0 5 * This file is part of the Independent JPEG Group's software.
nuclear@0 6 * For conditions of distribution and use, see the accompanying README file.
nuclear@0 7 *
nuclear@0 8 * This file contains additional configuration options that customize the
nuclear@0 9 * JPEG software for special applications or support machine-dependent
nuclear@0 10 * optimizations. Most users will not need to touch this file.
nuclear@0 11 */
nuclear@0 12
nuclear@0 13
nuclear@0 14 /*
nuclear@0 15 * Define BITS_IN_JSAMPLE as either
nuclear@0 16 * 8 for 8-bit sample values (the usual setting)
nuclear@0 17 * 12 for 12-bit sample values
nuclear@0 18 * Only 8 and 12 are legal data precisions for lossy JPEG according to the
nuclear@0 19 * JPEG standard, and the IJG code does not support anything else!
nuclear@0 20 * We do not support run-time selection of data precision, sorry.
nuclear@0 21 */
nuclear@0 22
nuclear@0 23 #define BITS_IN_JSAMPLE 8 /* use 8 or 12 */
nuclear@0 24
nuclear@0 25
nuclear@0 26 /*
nuclear@0 27 * Maximum number of components (color channels) allowed in JPEG image.
nuclear@0 28 * To meet the letter of the JPEG spec, set this to 255. However, darn
nuclear@0 29 * few applications need more than 4 channels (maybe 5 for CMYK + alpha
nuclear@0 30 * mask). We recommend 10 as a reasonable compromise; use 4 if you are
nuclear@0 31 * really short on memory. (Each allowed component costs a hundred or so
nuclear@0 32 * bytes of storage, whether actually used in an image or not.)
nuclear@0 33 */
nuclear@0 34
nuclear@0 35 #define MAX_COMPONENTS 10 /* maximum number of image components */
nuclear@0 36
nuclear@0 37
nuclear@0 38 /*
nuclear@0 39 * Basic data types.
nuclear@0 40 * You may need to change these if you have a machine with unusual data
nuclear@0 41 * type sizes; for example, "char" not 8 bits, "short" not 16 bits,
nuclear@0 42 * or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits,
nuclear@0 43 * but it had better be at least 16.
nuclear@0 44 */
nuclear@0 45
nuclear@0 46 /* Representation of a single sample (pixel element value).
nuclear@0 47 * We frequently allocate large arrays of these, so it's important to keep
nuclear@0 48 * them small. But if you have memory to burn and access to char or short
nuclear@0 49 * arrays is very slow on your hardware, you might want to change these.
nuclear@0 50 */
nuclear@0 51
nuclear@0 52 #if BITS_IN_JSAMPLE == 8
nuclear@0 53 /* JSAMPLE should be the smallest type that will hold the values 0..255.
nuclear@0 54 * You can use a signed char by having GETJSAMPLE mask it with 0xFF.
nuclear@0 55 */
nuclear@0 56
nuclear@0 57 #ifdef HAVE_UNSIGNED_CHAR
nuclear@0 58
nuclear@0 59 typedef unsigned char JSAMPLE;
nuclear@0 60 #define GETJSAMPLE(value) ((int) (value))
nuclear@0 61
nuclear@0 62 #else /* not HAVE_UNSIGNED_CHAR */
nuclear@0 63
nuclear@0 64 typedef char JSAMPLE;
nuclear@0 65 #ifdef CHAR_IS_UNSIGNED
nuclear@0 66 #define GETJSAMPLE(value) ((int) (value))
nuclear@0 67 #else
nuclear@0 68 #define GETJSAMPLE(value) ((int) (value) & 0xFF)
nuclear@0 69 #endif /* CHAR_IS_UNSIGNED */
nuclear@0 70
nuclear@0 71 #endif /* HAVE_UNSIGNED_CHAR */
nuclear@0 72
nuclear@0 73 #define MAXJSAMPLE 255
nuclear@0 74 #define CENTERJSAMPLE 128
nuclear@0 75
nuclear@0 76 #endif /* BITS_IN_JSAMPLE == 8 */
nuclear@0 77
nuclear@0 78
nuclear@0 79 #if BITS_IN_JSAMPLE == 12
nuclear@0 80 /* JSAMPLE should be the smallest type that will hold the values 0..4095.
nuclear@0 81 * On nearly all machines "short" will do nicely.
nuclear@0 82 */
nuclear@0 83
nuclear@0 84 typedef short JSAMPLE;
nuclear@0 85 #define GETJSAMPLE(value) ((int) (value))
nuclear@0 86
nuclear@0 87 #define MAXJSAMPLE 4095
nuclear@0 88 #define CENTERJSAMPLE 2048
nuclear@0 89
nuclear@0 90 #endif /* BITS_IN_JSAMPLE == 12 */
nuclear@0 91
nuclear@0 92
nuclear@0 93 /* Representation of a DCT frequency coefficient.
nuclear@0 94 * This should be a signed value of at least 16 bits; "short" is usually OK.
nuclear@0 95 * Again, we allocate large arrays of these, but you can change to int
nuclear@0 96 * if you have memory to burn and "short" is really slow.
nuclear@0 97 */
nuclear@0 98
nuclear@0 99 typedef short JCOEF;
nuclear@0 100
nuclear@0 101
nuclear@0 102 /* Compressed datastreams are represented as arrays of JOCTET.
nuclear@0 103 * These must be EXACTLY 8 bits wide, at least once they are written to
nuclear@0 104 * external storage. Note that when using the stdio data source/destination
nuclear@0 105 * managers, this is also the data type passed to fread/fwrite.
nuclear@0 106 */
nuclear@0 107
nuclear@0 108 #ifdef HAVE_UNSIGNED_CHAR
nuclear@0 109
nuclear@0 110 typedef unsigned char JOCTET;
nuclear@0 111 #define GETJOCTET(value) (value)
nuclear@0 112
nuclear@0 113 #else /* not HAVE_UNSIGNED_CHAR */
nuclear@0 114
nuclear@0 115 typedef char JOCTET;
nuclear@0 116 #ifdef CHAR_IS_UNSIGNED
nuclear@0 117 #define GETJOCTET(value) (value)
nuclear@0 118 #else
nuclear@0 119 #define GETJOCTET(value) ((value) & 0xFF)
nuclear@0 120 #endif /* CHAR_IS_UNSIGNED */
nuclear@0 121
nuclear@0 122 #endif /* HAVE_UNSIGNED_CHAR */
nuclear@0 123
nuclear@0 124
nuclear@0 125 /* These typedefs are used for various table entries and so forth.
nuclear@0 126 * They must be at least as wide as specified; but making them too big
nuclear@0 127 * won't cost a huge amount of memory, so we don't provide special
nuclear@0 128 * extraction code like we did for JSAMPLE. (In other words, these
nuclear@0 129 * typedefs live at a different point on the speed/space tradeoff curve.)
nuclear@0 130 */
nuclear@0 131
nuclear@0 132 /* UINT8 must hold at least the values 0..255. */
nuclear@0 133
nuclear@0 134 #ifdef HAVE_UNSIGNED_CHAR
nuclear@0 135 typedef unsigned char UINT8;
nuclear@0 136 #else /* not HAVE_UNSIGNED_CHAR */
nuclear@0 137 #ifdef CHAR_IS_UNSIGNED
nuclear@0 138 typedef char UINT8;
nuclear@0 139 #else /* not CHAR_IS_UNSIGNED */
nuclear@0 140 typedef short UINT8;
nuclear@0 141 #endif /* CHAR_IS_UNSIGNED */
nuclear@0 142 #endif /* HAVE_UNSIGNED_CHAR */
nuclear@0 143
nuclear@0 144 /* UINT16 must hold at least the values 0..65535. */
nuclear@0 145
nuclear@0 146 #ifdef HAVE_UNSIGNED_SHORT
nuclear@0 147 typedef unsigned short UINT16;
nuclear@0 148 #else /* not HAVE_UNSIGNED_SHORT */
nuclear@0 149 typedef unsigned int UINT16;
nuclear@0 150 #endif /* HAVE_UNSIGNED_SHORT */
nuclear@0 151
nuclear@0 152 /* INT16 must hold at least the values -32768..32767. */
nuclear@0 153
nuclear@0 154 #ifndef XMD_H /* X11/xmd.h correctly defines INT16 */
nuclear@0 155 typedef short INT16;
nuclear@0 156 #endif
nuclear@0 157
nuclear@0 158 /* INT32 must hold at least signed 32-bit values. */
nuclear@0 159
nuclear@0 160 #ifndef XMD_H /* X11/xmd.h correctly defines INT32 */
nuclear@0 161 typedef int INT32;
nuclear@0 162 #endif
nuclear@0 163
nuclear@0 164 /* Datatype used for image dimensions. The JPEG standard only supports
nuclear@0 165 * images up to 64K*64K due to 16-bit fields in SOF markers. Therefore
nuclear@0 166 * "unsigned int" is sufficient on all machines. However, if you need to
nuclear@0 167 * handle larger images and you don't mind deviating from the spec, you
nuclear@0 168 * can change this datatype.
nuclear@0 169 */
nuclear@0 170
nuclear@0 171 typedef unsigned int JDIMENSION;
nuclear@0 172
nuclear@0 173 #define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */
nuclear@0 174
nuclear@0 175
nuclear@0 176 /* These macros are used in all function definitions and extern declarations.
nuclear@0 177 * You could modify them if you need to change function linkage conventions;
nuclear@0 178 * in particular, you'll need to do that to make the library a Windows DLL.
nuclear@0 179 * Another application is to make all functions global for use with debuggers
nuclear@0 180 * or code profilers that require it.
nuclear@0 181 */
nuclear@0 182
nuclear@0 183 /* a function called through method pointers: */
nuclear@0 184 #define METHODDEF(type) static type
nuclear@0 185 /* a function used only in its module: */
nuclear@0 186 #define LOCAL(type) static type
nuclear@0 187 /* a function referenced thru EXTERNs: */
nuclear@0 188 #define GLOBAL(type) type
nuclear@0 189 /* a reference to a GLOBAL function: */
nuclear@0 190 #define EXTERN(type) extern type
nuclear@0 191
nuclear@0 192
nuclear@0 193 /* This macro is used to declare a "method", that is, a function pointer.
nuclear@0 194 * We want to supply prototype parameters if the compiler can cope.
nuclear@0 195 * Note that the arglist parameter must be parenthesized!
nuclear@0 196 * Again, you can customize this if you need special linkage keywords.
nuclear@0 197 */
nuclear@0 198
nuclear@0 199 #ifdef HAVE_PROTOTYPES
nuclear@0 200 #define JMETHOD(type,methodname,arglist) type (*methodname) arglist
nuclear@0 201 #else
nuclear@0 202 #define JMETHOD(type,methodname,arglist) type (*methodname) ()
nuclear@0 203 #endif
nuclear@0 204
nuclear@0 205
nuclear@0 206 /* Here is the pseudo-keyword for declaring pointers that must be "far"
nuclear@0 207 * on 80x86 machines. Most of the specialized coding for 80x86 is handled
nuclear@0 208 * by just saying "FAR *" where such a pointer is needed. In a few places
nuclear@0 209 * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
nuclear@0 210 */
nuclear@0 211
nuclear@0 212 #ifdef FAR
nuclear@0 213 #undef FAR
nuclear@0 214 #endif
nuclear@0 215
nuclear@0 216 #ifdef NEED_FAR_POINTERS
nuclear@0 217 #define FAR far
nuclear@0 218 #else
nuclear@0 219 #define FAR
nuclear@0 220 #endif
nuclear@0 221
nuclear@0 222
nuclear@0 223 /*
nuclear@0 224 * On a few systems, type boolean and/or its values FALSE, TRUE may appear
nuclear@0 225 * in standard header files. Or you may have conflicts with application-
nuclear@0 226 * specific header files that you want to include together with these files.
nuclear@0 227 * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
nuclear@0 228 */
nuclear@0 229
nuclear@0 230 #ifndef HAVE_BOOLEAN
nuclear@0 231 typedef int boolean;
nuclear@0 232 #endif
nuclear@0 233 #ifndef FALSE /* in case these macros already exist */
nuclear@0 234 #define FALSE 0 /* values of boolean */
nuclear@0 235 #endif
nuclear@0 236 #ifndef TRUE
nuclear@0 237 #define TRUE 1
nuclear@0 238 #endif
nuclear@0 239
nuclear@0 240
nuclear@0 241 /*
nuclear@0 242 * The remaining options affect code selection within the JPEG library,
nuclear@0 243 * but they don't need to be visible to most applications using the library.
nuclear@0 244 * To minimize application namespace pollution, the symbols won't be
nuclear@0 245 * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
nuclear@0 246 */
nuclear@0 247
nuclear@0 248 #ifdef JPEG_INTERNALS
nuclear@0 249 #define JPEG_INTERNAL_OPTIONS
nuclear@0 250 #endif
nuclear@0 251
nuclear@0 252 #ifdef JPEG_INTERNAL_OPTIONS
nuclear@0 253
nuclear@0 254
nuclear@0 255 /*
nuclear@0 256 * These defines indicate whether to include various optional functions.
nuclear@0 257 * Undefining some of these symbols will produce a smaller but less capable
nuclear@0 258 * library. Note that you can leave certain source files out of the
nuclear@0 259 * compilation/linking process if you've #undef'd the corresponding symbols.
nuclear@0 260 * (You may HAVE to do that if your compiler doesn't like null source files.)
nuclear@0 261 */
nuclear@0 262
nuclear@0 263 /* Arithmetic coding is unsupported for legal reasons. Complaints to IBM. */
nuclear@0 264
nuclear@0 265 /* Capability options common to encoder and decoder: */
nuclear@0 266
nuclear@0 267 #define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */
nuclear@0 268 #define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */
nuclear@0 269 #define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */
nuclear@0 270
nuclear@0 271 /* Encoder capability options: */
nuclear@0 272
nuclear@0 273 #undef C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
nuclear@0 274 #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
nuclear@0 275 #define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
nuclear@0 276 #define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */
nuclear@0 277 /* Note: if you selected 12-bit data precision, it is dangerous to turn off
nuclear@0 278 * ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit
nuclear@0 279 * precision, so jchuff.c normally uses entropy optimization to compute
nuclear@0 280 * usable tables for higher precision. If you don't want to do optimization,
nuclear@0 281 * you'll have to supply different default Huffman tables.
nuclear@0 282 * The exact same statements apply for progressive JPEG: the default tables
nuclear@0 283 * don't work for progressive mode. (This may get fixed, however.)
nuclear@0 284 */
nuclear@0 285 #define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */
nuclear@0 286
nuclear@0 287 /* Decoder capability options: */
nuclear@0 288
nuclear@0 289 #undef D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
nuclear@0 290 #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
nuclear@0 291 #define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
nuclear@0 292 #define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */
nuclear@0 293 #define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */
nuclear@0 294 #define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */
nuclear@0 295 #undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */
nuclear@0 296 #define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */
nuclear@0 297 #define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */
nuclear@0 298 #define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */
nuclear@0 299
nuclear@0 300 /* more capability options later, no doubt */
nuclear@0 301
nuclear@0 302
nuclear@0 303 /*
nuclear@0 304 * Ordering of RGB data in scanlines passed to or from the application.
nuclear@0 305 * If your application wants to deal with data in the order B,G,R, just
nuclear@0 306 * change these macros. You can also deal with formats such as R,G,B,X
nuclear@0 307 * (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing
nuclear@0 308 * the offsets will also change the order in which colormap data is organized.
nuclear@0 309 * RESTRICTIONS:
nuclear@0 310 * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
nuclear@0 311 * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
nuclear@0 312 * useful if you are using JPEG color spaces other than YCbCr or grayscale.
nuclear@0 313 * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
nuclear@0 314 * is not 3 (they don't understand about dummy color components!). So you
nuclear@0 315 * can't use color quantization if you change that value.
nuclear@0 316 */
nuclear@0 317
nuclear@0 318 #define RGB_RED 0 /* Offset of Red in an RGB scanline element */
nuclear@0 319 #define RGB_GREEN 1 /* Offset of Green */
nuclear@0 320 #define RGB_BLUE 2 /* Offset of Blue */
nuclear@0 321 #define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */
nuclear@0 322
nuclear@0 323
nuclear@0 324 /* Definitions for speed-related optimizations. */
nuclear@0 325
nuclear@0 326
nuclear@0 327 /* If your compiler supports inline functions, define INLINE
nuclear@0 328 * as the inline keyword; otherwise define it as empty.
nuclear@0 329 */
nuclear@0 330
nuclear@0 331 #ifndef INLINE
nuclear@0 332 #ifdef __GNUC__ /* for instance, GNU C knows about inline */
nuclear@0 333 #define INLINE __inline__
nuclear@0 334 #endif
nuclear@0 335 #ifndef INLINE
nuclear@0 336 #define INLINE /* default is to define it as empty */
nuclear@0 337 #endif
nuclear@0 338 #endif
nuclear@0 339
nuclear@0 340
nuclear@0 341 /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
nuclear@0 342 * two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER
nuclear@0 343 * as short on such a machine. MULTIPLIER must be at least 16 bits wide.
nuclear@0 344 */
nuclear@0 345
nuclear@0 346 #ifndef MULTIPLIER
nuclear@0 347 #define MULTIPLIER int /* type for fastest integer multiply */
nuclear@0 348 #endif
nuclear@0 349
nuclear@0 350
nuclear@0 351 /* FAST_FLOAT should be either float or double, whichever is done faster
nuclear@0 352 * by your compiler. (Note that this type is only used in the floating point
nuclear@0 353 * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
nuclear@0 354 * Typically, float is faster in ANSI C compilers, while double is faster in
nuclear@0 355 * pre-ANSI compilers (because they insist on converting to double anyway).
nuclear@0 356 * The code below therefore chooses float if we have ANSI-style prototypes.
nuclear@0 357 */
nuclear@0 358
nuclear@0 359 #ifndef FAST_FLOAT
nuclear@0 360 #ifdef HAVE_PROTOTYPES
nuclear@0 361 #define FAST_FLOAT float
nuclear@0 362 #else
nuclear@0 363 #define FAST_FLOAT double
nuclear@0 364 #endif
nuclear@0 365 #endif
nuclear@0 366
nuclear@0 367 #endif /* JPEG_INTERNAL_OPTIONS */