/ocr/ocrservice/jni/hydrogen/include/leptonica/jmorecfg.h.hide

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  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. * Define BITS_IN_JSAMPLE as either
  14. * 8 for 8-bit sample values (the usual setting)
  15. * 12 for 12-bit sample values
  16. * Only 8 and 12 are legal data precisions for lossy JPEG according to the
  17. * JPEG standard, and the IJG code does not support anything else!
  18. * We do not support run-time selection of data precision, sorry.
  19. */
  20. /* use 8 or 12 */
  21. #define BITS_IN_JSAMPLE 8
  22. /*
  23. * Maximum number of components (color channels) allowed in JPEG image.
  24. * To meet the letter of the JPEG spec, set this to 255. However, darn
  25. * few applications need more than 4 channels (maybe 5 for CMYK + alpha
  26. * mask). We recommend 10 as a reasonable compromise; use 4 if you are
  27. * really short on memory. (Each allowed component costs a hundred or so
  28. * bytes of storage, whether actually used in an image or not.)
  29. */
  30. #define MAX_COMPONENTS 10 /* maximum number of image components */
  31. /*
  32. * Basic data types.
  33. * You may need to change these if you have a machine with unusual data
  34. * type sizes; for example, "char" not 8 bits, "short" not 16 bits,
  35. * or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits,
  36. * but it had better be at least 16.
  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. #if BITS_IN_JSAMPLE == 8
  44. /* JSAMPLE should be the smallest type that will hold the values 0..255.
  45. * You can use a signed char by having GETJSAMPLE mask it with 0xFF.
  46. */
  47. #ifdef HAVE_UNSIGNED_CHAR
  48. typedef unsigned char JSAMPLE;
  49. #define GETJSAMPLE(value) ((int) (value))
  50. #else /* not HAVE_UNSIGNED_CHAR */
  51. typedef char JSAMPLE;
  52. #ifdef CHAR_IS_UNSIGNED
  53. #define GETJSAMPLE(value) ((int) (value))
  54. #else
  55. #define GETJSAMPLE(value) ((int) (value) & 0xFF)
  56. #endif /* CHAR_IS_UNSIGNED */
  57. #endif /* HAVE_UNSIGNED_CHAR */
  58. #define MAXJSAMPLE 255
  59. #define CENTERJSAMPLE 128
  60. #endif /* BITS_IN_JSAMPLE == 8 */
  61. #if BITS_IN_JSAMPLE == 12
  62. /* JSAMPLE should be the smallest type that will hold the values 0..4095.
  63. * On nearly all machines "short" will do nicely.
  64. */
  65. typedef short JSAMPLE;
  66. #define GETJSAMPLE(value) ((int) (value))
  67. #define MAXJSAMPLE 4095
  68. #define CENTERJSAMPLE 2048
  69. #endif /* BITS_IN_JSAMPLE == 12 */
  70. /* Representation of a DCT frequency coefficient.
  71. * This should be a signed value of at least 16 bits; "short" is usually OK.
  72. * Again, we allocate large arrays of these, but you can change to int
  73. * if you have memory to burn and "short" is really slow.
  74. */
  75. typedef short JCOEF;
  76. /* Compressed datastreams are represented as arrays of JOCTET.
  77. * These must be EXACTLY 8 bits wide, at least once they are written to
  78. * external storage. Note that when using the stdio data source/destination
  79. * managers, this is also the data type passed to fread/fwrite.
  80. */
  81. #ifdef HAVE_UNSIGNED_CHAR
  82. typedef unsigned char JOCTET;
  83. #define GETJOCTET(value) (value)
  84. #else /* not HAVE_UNSIGNED_CHAR */
  85. typedef char JOCTET;
  86. #ifdef CHAR_IS_UNSIGNED
  87. #define GETJOCTET(value) (value)
  88. #else
  89. #define GETJOCTET(value) ((value) & 0xFF)
  90. #endif /* CHAR_IS_UNSIGNED */
  91. #endif /* HAVE_UNSIGNED_CHAR */
  92. /* These typedefs are used for various table entries and so forth.
  93. * They must be at least as wide as specified; but making them too big
  94. * won't cost a huge amount of memory, so we don't provide special
  95. * extraction code like we did for JSAMPLE. (In other words, these
  96. * typedefs live at a different point on the speed/space tradeoff curve.)
  97. */
  98. /* UINT8 must hold at least the values 0..255. */
  99. #ifdef HAVE_UNSIGNED_CHAR
  100. typedef unsigned char UINT8;
  101. #else /* not HAVE_UNSIGNED_CHAR */
  102. #ifdef CHAR_IS_UNSIGNED
  103. typedef char UINT8;
  104. #else /* not CHAR_IS_UNSIGNED */
  105. typedef short UINT8;
  106. #endif /* CHAR_IS_UNSIGNED */
  107. #endif /* HAVE_UNSIGNED_CHAR */
  108. /* UINT16 must hold at least the values 0..65535. */
  109. #ifdef HAVE_UNSIGNED_SHORT
  110. typedef unsigned short UINT16;
  111. #else /* not HAVE_UNSIGNED_SHORT */
  112. typedef unsigned int UINT16;
  113. #endif /* HAVE_UNSIGNED_SHORT */
  114. /* INT16 must hold at least the values -32768..32767. */
  115. #ifndef XMD_H /* X11/xmd.h correctly defines INT16 */
  116. typedef short INT16;
  117. #endif
  118. /* INT32 must hold at least signed 32-bit values. */
  119. #if !defined(XMD_H) && !defined(_WIN32) /* X11/xmd.h correctly defines INT32 */
  120. typedef long INT32;
  121. #endif
  122. /* Datatype used for image dimensions. The JPEG standard only supports
  123. * images up to 64K*64K due to 16-bit fields in SOF markers. Therefore
  124. * "unsigned int" is sufficient on all machines. However, if you need to
  125. * handle larger images and you don't mind deviating from the spec, you
  126. * can change this datatype.
  127. */
  128. typedef unsigned int JDIMENSION;
  129. #define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */
  130. /* These macros are used in all function definitions and extern declarations.
  131. * You could modify them if you need to change function linkage conventions;
  132. * in particular, you'll need to do that to make the library a Windows DLL.
  133. * Another application is to make all functions global for use with debuggers
  134. * or code profilers that require it.
  135. */
  136. /* a function called through method pointers: */
  137. #define METHODDEF(type) static type
  138. /* a function used only in its module: */
  139. #define LOCAL(type) static type
  140. /* a function referenced thru EXTERNs: */
  141. #define GLOBAL(type) type
  142. /* a reference to a GLOBAL function: */
  143. #define EXTERN(type) extern type
  144. /* This macro is used to declare a "method", that is, a function pointer.
  145. * We want to supply prototype parameters if the compiler can cope.
  146. * Note that the arglist parameter must be parenthesized!
  147. * Again, you can customize this if you need special linkage keywords.
  148. */
  149. #ifdef HAVE_PROTOTYPES
  150. #define JMETHOD(type,methodname,arglist) type (*methodname) arglist
  151. #else
  152. #define JMETHOD(type,methodname,arglist) type (*methodname) ()
  153. #endif
  154. /* Here is the pseudo-keyword for declaring pointers that must be "far"
  155. * on 80x86 machines. Most of the specialized coding for 80x86 is handled
  156. * by just saying "FAR *" where such a pointer is needed. In a few places
  157. * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
  158. */
  159. #ifdef NEED_FAR_POINTERS
  160. #define FAR far
  161. #else
  162. #define FAR
  163. #endif
  164. /*
  165. * On a few systems, type boolean and/or its values FALSE, TRUE may appear
  166. * in standard header files. Or you may have conflicts with application-
  167. * specific header files that you want to include together with these files.
  168. * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
  169. */
  170. /*
  171. * Added note [10 Jul 08]:
  172. * The jpeg library may crash if it is compiled with a different jmorecfg.h.
  173. * For example, if compiled under MSVC with
  174. * typedef unsigned char boolean;
  175. * there will be a runtime error due to a struct size mismatch
  176. * if you use this file with
  177. * typedef int boolean;
  178. */
  179. #ifndef HAVE_BOOLEAN
  180. typedef int boolean;
  181. #endif
  182. #ifndef FALSE /* in case these macros already exist */
  183. #define FALSE 0 /* values of boolean */
  184. #endif
  185. #ifndef TRUE
  186. #define TRUE 1
  187. #endif
  188. /*
  189. * The remaining options affect code selection within the JPEG library,
  190. * but they don't need to be visible to most applications using the library.
  191. * To minimize application namespace pollution, the symbols won't be
  192. * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
  193. */
  194. #ifdef JPEG_INTERNALS
  195. #define JPEG_INTERNAL_OPTIONS
  196. #endif
  197. #ifdef JPEG_INTERNAL_OPTIONS
  198. /*
  199. * These defines indicate whether to include various optional functions.
  200. * Undefining some of these symbols will produce a smaller but less capable
  201. * library. Note that you can leave certain source files out of the
  202. * compilation/linking process if you've #undef'd the corresponding symbols.
  203. * (You may HAVE to do that if your compiler doesn't like null source files.)
  204. */
  205. /* Arithmetic coding is unsupported for legal reasons. Complaints to IBM. */
  206. /* Capability options common to encoder and decoder: */
  207. #define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */
  208. #define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */
  209. #define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */
  210. /* Encoder capability options: */
  211. #undef C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
  212. #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
  213. #define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
  214. #define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */
  215. /* Note: if you selected 12-bit data precision, it is dangerous to turn off
  216. * ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit
  217. * precision, so jchuff.c normally uses entropy optimization to compute
  218. * usable tables for higher precision. If you don't want to do optimization,
  219. * you'll have to supply different default Huffman tables.
  220. * The exact same statements apply for progressive JPEG: the default tables
  221. * don't work for progressive mode. (This may get fixed, however.)
  222. */
  223. #define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */
  224. /* Decoder capability options: */
  225. #undef D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
  226. #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
  227. #define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
  228. #define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */
  229. #define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */
  230. #define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */
  231. #undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */
  232. #define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */
  233. #define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */
  234. #define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */
  235. /* more capability options later, no doubt */
  236. /*
  237. * Ordering of RGB data in scanlines passed to or from the application.
  238. * If your application wants to deal with data in the order B,G,R, just
  239. * change these macros. You can also deal with formats such as R,G,B,X
  240. * (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing
  241. * the offsets will also change the order in which colormap data is organized.
  242. * RESTRICTIONS:
  243. * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
  244. * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
  245. * useful if you are using JPEG color spaces other than YCbCr or grayscale.
  246. * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
  247. * is not 3 (they don't understand about dummy color components!). So you
  248. * can't use color quantization if you change that value.
  249. */
  250. #define RGB_RED 0 /* Offset of Red in an RGB scanline element */
  251. #define RGB_GREEN 1 /* Offset of Green */
  252. #define RGB_BLUE 2 /* Offset of Blue */
  253. #define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */
  254. /* Definitions for speed-related optimizations. */
  255. /* If your compiler supports inline functions, define INLINE
  256. * as the inline keyword; otherwise define it as empty.
  257. */
  258. #ifndef INLINE
  259. #ifdef __GNUC__ /* for instance, GNU C knows about inline */
  260. #define INLINE __inline__
  261. #endif
  262. #ifndef INLINE
  263. #define INLINE /* default is to define it as empty */
  264. #endif
  265. #endif
  266. /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
  267. * two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER
  268. * as short on such a machine. MULTIPLIER must be at least 16 bits wide.
  269. */
  270. #ifndef MULTIPLIER
  271. #define MULTIPLIER int /* type for fastest integer multiply */
  272. #endif
  273. /* FAST_FLOAT should be either float or double, whichever is done faster
  274. * by your compiler. (Note that this type is only used in the floating point
  275. * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
  276. * Typically, float is faster in ANSI C compilers, while double is faster in
  277. * pre-ANSI compilers (because they insist on converting to double anyway).
  278. * The code below therefore chooses float if we have ANSI-style prototypes.
  279. */
  280. #ifndef FAST_FLOAT
  281. #ifdef HAVE_PROTOTYPES
  282. #define FAST_FLOAT float
  283. #else
  284. #define FAST_FLOAT double
  285. #endif
  286. #endif
  287. #endif /* JPEG_INTERNAL_OPTIONS */