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