1 /* 2 * jmorecfg.h 3 * 4 * Copyright (C) 1991-1997, Thomas G. Lane. 5 * This file is part of the Independent JPEG Group's software. 6 * For conditions of distribution and use, see the accompanying README file. 7 * 8 * This file contains additional configuration options that customize the 9 * JPEG software for special applications or support machine-dependent 10 * optimizations. Most users will not need to touch this file. 11 */ 12 13 #ifndef JMORECFG_H 14 #define JMORECFG_H 15 16 #include <stdint.h> 17 18 /* 19 * Define ANDROID_RGB to enable specific optimizations for Android 20 * JCS_RGBA_8888 support 21 * JCS_RGB_565 support 22 * 23 */ 24 25 #define ANDROID_RGB 26 27 #ifdef ANDROID_RGB 28 #define PACK_SHORT_565(r,g,b) ((((r)<<8)&0xf800)|(((g)<<3)&0x7E0)|((b)>>3)) 29 #define PACK_TWO_PIXELS(l,r) ((r<<16) | l) 30 #define PACK_NEED_ALIGNMENT(ptr) (((uintptr_t)(ptr))&3) 31 #define WRITE_TWO_PIXELS(addr, pixels) do { \ 32 ((INT16*)(addr))[0] = (pixels); \ 33 ((INT16*)(addr))[1] = (pixels)>>16; \ 34 } while(0) 35 #define WRITE_TWO_ALIGNED_PIXELS(addr, pixels) ((*(INT32*)(addr)) = pixels) 36 #define DITHER_565_R(r, dither) ((r) + ((dither)&0xFF)) 37 #define DITHER_565_G(g, dither) ((g) + (((dither)&0xFF)>>1)) 38 #define DITHER_565_B(b, dither) ((b) + ((dither)&0xFF)) 39 #endif 40 41 /* 42 * Define BITS_IN_JSAMPLE as either 43 * 8 for 8-bit sample values (the usual setting) 44 * 12 for 12-bit sample values 45 * Only 8 and 12 are legal data precisions for lossy JPEG according to the 46 * JPEG standard, and the IJG code does not support anything else! 47 * We do not support run-time selection of data precision, sorry. 48 */ 49 50 #define BITS_IN_JSAMPLE 8 /* use 8 or 12 */ 51 52 53 /* 54 * Maximum number of components (color channels) allowed in JPEG image. 55 * To meet the letter of the JPEG spec, set this to 255. However, darn 56 * few applications need more than 4 channels (maybe 5 for CMYK + alpha 57 * mask). We recommend 10 as a reasonable compromise; use 4 if you are 58 * really short on memory. (Each allowed component costs a hundred or so 59 * bytes of storage, whether actually used in an image or not.) 60 */ 61 62 #define MAX_COMPONENTS 10 /* maximum number of image components */ 63 64 65 /* 66 * Basic data types. 67 * You may need to change these if you have a machine with unusual data 68 * type sizes; for example, "char" not 8 bits, "short" not 16 bits, 69 * or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits, 70 * but it had better be at least 16. 71 */ 72 73 /* Representation of a single sample (pixel element value). 74 * We frequently allocate large arrays of these, so it's important to keep 75 * them small. But if you have memory to burn and access to char or short 76 * arrays is very slow on your hardware, you might want to change these. 77 */ 78 79 #if BITS_IN_JSAMPLE == 8 80 /* JSAMPLE should be the smallest type that will hold the values 0..255. 81 * You can use a signed char by having GETJSAMPLE mask it with 0xFF. 82 */ 83 84 #ifdef HAVE_UNSIGNED_CHAR 85 86 typedef uint8_t JSAMPLE; 87 #define GETJSAMPLE(value) ((int) (value)) 88 89 #else /* not HAVE_UNSIGNED_CHAR */ 90 91 typedef char JSAMPLE; 92 #ifdef CHAR_IS_UNSIGNED 93 #define GETJSAMPLE(value) ((int) (value)) 94 #else 95 #define GETJSAMPLE(value) ((int) (value) & 0xFF) 96 #endif /* CHAR_IS_UNSIGNED */ 97 98 #endif /* HAVE_UNSIGNED_CHAR */ 99 100 #define MAXJSAMPLE 255 101 #define CENTERJSAMPLE 128 102 103 #endif /* BITS_IN_JSAMPLE == 8 */ 104 105 106 #if BITS_IN_JSAMPLE == 12 107 /* JSAMPLE should be the smallest type that will hold the values 0..4095. 108 * On nearly all machines "short" will do nicely. 109 */ 110 111 typedef int16_t JSAMPLE; 112 #define GETJSAMPLE(value) ((int) (value)) 113 114 #define MAXJSAMPLE 4095 115 #define CENTERJSAMPLE 2048 116 117 #endif /* BITS_IN_JSAMPLE == 12 */ 118 119 120 /* Representation of a DCT frequency coefficient. 121 * This should be a signed value of at least 16 bits; "short" is usually OK. 122 * Again, we allocate large arrays of these, but you can change to int 123 * if you have memory to burn and "short" is really slow. 124 */ 125 126 typedef int16_t JCOEF; 127 128 129 /* Compressed datastreams are represented as arrays of JOCTET. 130 * These must be EXACTLY 8 bits wide, at least once they are written to 131 * external storage. Note that when using the stdio data source/destination 132 * managers, this is also the data type passed to fread/fwrite. 133 */ 134 135 #ifdef HAVE_UNSIGNED_CHAR 136 137 typedef uint8_t JOCTET; 138 #define GETJOCTET(value) (value) 139 140 #else /* not HAVE_UNSIGNED_CHAR */ 141 142 typedef char JOCTET; 143 #ifdef CHAR_IS_UNSIGNED 144 #define GETJOCTET(value) (value) 145 #else 146 #define GETJOCTET(value) ((value) & 0xFF) 147 #endif /* CHAR_IS_UNSIGNED */ 148 149 #endif /* HAVE_UNSIGNED_CHAR */ 150 151 152 /* These typedefs are used for various table entries and so forth. 153 * They must be at least as wide as specified; but making them too big 154 * won't cost a huge amount of memory, so we don't provide special 155 * extraction code like we did for JSAMPLE. (In other words, these 156 * typedefs live at a different point on the speed/space tradeoff curve.) 157 */ 158 159 /* UINT8 must hold at least the values 0..255. */ 160 161 #ifdef HAVE_UNSIGNED_CHAR 162 typedef uint8_t UINT8; 163 #else /* not HAVE_UNSIGNED_CHAR */ 164 #ifdef CHAR_IS_UNSIGNED 165 typedef char UINT8; 166 #else /* not CHAR_IS_UNSIGNED */ 167 typedef short UINT8; 168 #endif /* CHAR_IS_UNSIGNED */ 169 #endif /* HAVE_UNSIGNED_CHAR */ 170 171 /* UINT16 must hold at least the values 0..65535. */ 172 173 #ifdef HAVE_UNSIGNED_SHORT 174 typedef uint16_t UINT16; 175 #else /* not HAVE_UNSIGNED_SHORT */ 176 typedef unsigned int UINT16; 177 #endif /* HAVE_UNSIGNED_SHORT */ 178 179 /* INT16 must hold at least the values -32768..32767. */ 180 181 #ifndef XMD_H /* X11/xmd.h correctly defines INT16 */ 182 typedef int16_t INT16; 183 #endif 184 185 /* INT32 must hold at least signed 32-bit values. */ 186 187 #ifndef XMD_H /* X11/xmd.h correctly defines INT32 */ 188 typedef int32_t INT32; 189 #endif 190 191 /* Datatype used for image dimensions. The JPEG standard only supports 192 * images up to 64K*64K due to 16-bit fields in SOF markers. Therefore 193 * "unsigned int" is sufficient on all machines. However, if you need to 194 * handle larger images and you don't mind deviating from the spec, you 195 * can change this datatype. 196 */ 197 198 typedef unsigned int JDIMENSION; 199 200 #define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */ 201 202 203 /* These macros are used in all function definitions and extern declarations. 204 * You could modify them if you need to change function linkage conventions; 205 * in particular, you'll need to do that to make the library a Windows DLL. 206 * Another application is to make all functions global for use with debuggers 207 * or code profilers that require it. 208 */ 209 210 /* a function called through method pointers: */ 211 #define METHODDEF(type) static type 212 /* a function used only in its module: */ 213 #define LOCAL(type) static type 214 /* a function referenced thru EXTERNs: */ 215 #define GLOBAL(type) type 216 /* a reference to a GLOBAL function: */ 217 #define EXTERN(type) extern type 218 219 220 /* This macro is used to declare a "method", that is, a function pointer. 221 * We want to supply prototype parameters if the compiler can cope. 222 * Note that the arglist parameter must be parenthesized! 223 * Again, you can customize this if you need special linkage keywords. 224 */ 225 226 #ifdef HAVE_PROTOTYPES 227 #define JMETHOD(type,methodname,arglist) type (*methodname) arglist 228 #else 229 #define JMETHOD(type,methodname,arglist) type (*methodname) () 230 #endif 231 232 233 /* Here is the pseudo-keyword for declaring pointers that must be "far" 234 * on 80x86 machines. Most of the specialized coding for 80x86 is handled 235 * by just saying "FAR *" where such a pointer is needed. In a few places 236 * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol. 237 */ 238 239 #ifdef NEED_FAR_POINTERS 240 #define FAR far 241 #else 242 #define FAR 243 #endif 244 245 246 /* 247 * On a few systems, type boolean and/or its values FALSE, TRUE may appear 248 * in standard header files. Or you may have conflicts with application- 249 * specific header files that you want to include together with these files. 250 * Defining HAVE_BOOLEAN before including jpeglib.h should make it work. 251 */ 252 253 #ifndef HAVE_BOOLEAN 254 typedef int boolean; 255 #endif 256 #ifndef FALSE /* in case these macros already exist */ 257 #define FALSE 0 /* values of boolean */ 258 #endif 259 #ifndef TRUE 260 #define TRUE 1 261 #endif 262 263 264 /* 265 * The remaining options affect code selection within the JPEG library, 266 * but they don't need to be visible to most applications using the library. 267 * To minimize application namespace pollution, the symbols won't be 268 * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined. 269 */ 270 271 #ifdef JPEG_INTERNALS 272 #define JPEG_INTERNAL_OPTIONS 273 #endif 274 275 #ifdef JPEG_INTERNAL_OPTIONS 276 277 278 /* 279 * These defines indicate whether to include various optional functions. 280 * Undefining some of these symbols will produce a smaller but less capable 281 * library. Note that you can leave certain source files out of the 282 * compilation/linking process if you've #undef'd the corresponding symbols. 283 * (You may HAVE to do that if your compiler doesn't like null source files.) 284 */ 285 286 /* Arithmetic coding is unsupported for legal reasons. Complaints to IBM. */ 287 288 /* Capability options common to encoder and decoder: */ 289 290 #define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */ 291 #define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */ 292 #define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */ 293 294 /* Encoder capability options: */ 295 296 #undef C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */ 297 #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */ 298 #define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/ 299 #define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */ 300 /* Note: if you selected 12-bit data precision, it is dangerous to turn off 301 * ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit 302 * precision, so jchuff.c normally uses entropy optimization to compute 303 * usable tables for higher precision. If you don't want to do optimization, 304 * you'll have to supply different default Huffman tables. 305 * The exact same statements apply for progressive JPEG: the default tables 306 * don't work for progressive mode. (This may get fixed, however.) 307 */ 308 #define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */ 309 310 /* Decoder capability options: */ 311 312 #undef D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */ 313 #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */ 314 #define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/ 315 #define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */ 316 #define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */ 317 #define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */ 318 #undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */ 319 #define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */ 320 #define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */ 321 #define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */ 322 323 /* more capability options later, no doubt */ 324 325 326 /* 327 * Ordering of RGB data in scanlines passed to or from the application. 328 * If your application wants to deal with data in the order B,G,R, just 329 * change these macros. You can also deal with formats such as R,G,B,X 330 * (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing 331 * the offsets will also change the order in which colormap data is organized. 332 * RESTRICTIONS: 333 * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats. 334 * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not 335 * useful if you are using JPEG color spaces other than YCbCr or grayscale. 336 * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE 337 * is not 3 (they don't understand about dummy color components!). So you 338 * can't use color quantization if you change that value. 339 */ 340 341 #define RGB_RED 0 /* Offset of Red in an RGB scanline element */ 342 #define RGB_GREEN 1 /* Offset of Green */ 343 #define RGB_BLUE 2 /* Offset of Blue */ 344 #ifdef ANDROID_RGB 345 #define RGB_ALPHA 3 /* Offset of Alpha */ 346 #endif 347 #define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */ 348 349 /* Definitions for speed-related optimizations. */ 350 351 352 /* If your compiler supports inline functions, define INLINE 353 * as the inline keyword; otherwise define it as empty. 354 */ 355 356 #ifndef INLINE 357 #ifdef __GNUC__ /* for instance, GNU C knows about inline */ 358 #define INLINE __inline__ 359 #endif 360 #ifndef INLINE 361 #define INLINE /* default is to define it as empty */ 362 #endif 363 #endif 364 365 366 /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying 367 * two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER 368 * as short on such a machine. MULTIPLIER must be at least 16 bits wide. 369 */ 370 371 #ifndef MULTIPLIER 372 #ifdef ANDROID_INTELSSE2_IDCT 373 #define MULTIPLIER short 374 #elif ANDROID_MIPS_IDCT 375 #define MULTIPLIER short 376 #elif NV_ARM_NEON 377 #define MULTIPLIER short 378 #else 379 #define MULTIPLIER int /* type for fastest integer multiply */ 380 #endif 381 #endif 382 383 384 /* FAST_FLOAT should be either float or double, whichever is done faster 385 * by your compiler. (Note that this type is only used in the floating point 386 * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.) 387 * Typically, float is faster in ANSI C compilers, while double is faster in 388 * pre-ANSI compilers (because they insist on converting to double anyway). 389 * The code below therefore chooses float if we have ANSI-style prototypes. 390 */ 391 392 #ifndef FAST_FLOAT 393 #ifdef HAVE_PROTOTYPES 394 #define FAST_FLOAT float 395 #else 396 #define FAST_FLOAT double 397 #endif 398 #endif 399 400 #endif /* JPEG_INTERNAL_OPTIONS */ 401 402 #endif /* JMORECFG_H */ 403