/*

* jmorecfg.h

*

* Copyright (C) 1991-1997, Thomas G. Lane.

* Modified 1997-2011 by Guido Vollbeding.

* This file is part of the Independent JPEG Group's software.

* For conditions of distribution and use, see the accompanying README file.

*

* This file contains additional configuration options that customize the

* JPEG software for special applications or support machine-dependent

* optimizations. Most users will not need to touch this file.

*/

/*

* Define BITS_IN_JSAMPLE as either

* 8 for 8-bit sample values (the usual setting)

* 12 for 12-bit sample values

* Only 8 and 12 are legal data precisions for lossy JPEG according to the

* JPEG standard, and the IJG code does not support anything else!

* We do not support run-time selection of data precision, sorry.

*/

#define BITS_IN_JSAMPLE 8 /* use 8 or 12 */

/*

* Maximum number of components (color channels) allowed in JPEG image.

* To meet the letter of the JPEG spec, set this to 255. However, darn

* few applications need more than 4 channels (maybe 5 for CMYK + alpha

* mask). We recommend 10 as a reasonable compromise; use 4 if you are

* really short on memory. (Each allowed component costs a hundred or so

* bytes of storage, whether actually used in an image or not.)

*/

#define MAX_COMPONENTS 10 /* maximum number of image components */

/*

* Basic data types.

* You may need to change these if you have a machine with unusual data

* type sizes; for example, "char" not 8 bits, "short" not 16 bits,

* or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits,

* but it had better be at least 16.

*/

/* Representation of a single sample (pixel element value).

* We frequently allocate large arrays of these, so it's important to keep

* them small. But if you have memory to burn and access to char or short

* arrays is very slow on your hardware, you might want to change these.

*/

#if BITS_IN_JSAMPLE == 8

/* JSAMPLE should be the smallest type that will hold the values 0..255.

* You can use a signed char by having GETJSAMPLE mask it with 0xFF.

*/

#ifdef HAVE_UNSIGNED_CHAR

typedef unsigned char JSAMPLE;

#define GETJSAMPLE(value) ((int) (value))

#else /* not HAVE_UNSIGNED_CHAR */

typedef char JSAMPLE;

#ifdef CHAR_IS_UNSIGNED

#define GETJSAMPLE(value) ((int) (value))

#else

#define GETJSAMPLE(value) ((int) (value) & 0xFF)

#endif /* CHAR_IS_UNSIGNED */

#endif /* HAVE_UNSIGNED_CHAR */

#define MAXJSAMPLE 255

#define CENTERJSAMPLE 128

#endif /* BITS_IN_JSAMPLE == 8 */

#if BITS_IN_JSAMPLE == 12

/* JSAMPLE should be the smallest type that will hold the values 0..4095.

* On nearly all machines "short" will do nicely.

*/

typedef short JSAMPLE;

#define GETJSAMPLE(value) ((int) (value))

#define MAXJSAMPLE 4095

#define CENTERJSAMPLE 2048

#endif /* BITS_IN_JSAMPLE == 12 */

/* Representation of a DCT frequency coefficient.

* This should be a signed value of at least 16 bits; "short" is usually OK.

* Again, we allocate large arrays of these, but you can change to int

* if you have memory to burn and "short" is really slow.

*/

typedef short JCOEF;

/* Compressed datastreams are represented as arrays of JOCTET.

* These must be EXACTLY 8 bits wide, at least once they are written to

* external storage. Note that when using the stdio data source/destination

* managers, this is also the data type passed to fread/fwrite.

*/

#ifdef HAVE_UNSIGNED_CHAR

typedef unsigned char JOCTET;

#define GETJOCTET(value) (value)

#else /* not HAVE_UNSIGNED_CHAR */

typedef char JOCTET;

#ifdef CHAR_IS_UNSIGNED

#define GETJOCTET(value) (value)

#else

#define GETJOCTET(value) ((value) & 0xFF)

#endif /* CHAR_IS_UNSIGNED */

#endif /* HAVE_UNSIGNED_CHAR */

/* These typedefs are used for various table entries and so forth.

* They must be at least as wide as specified; but making them too big

* won't cost a huge amount of memory, so we don't provide special

* extraction code like we did for JSAMPLE. (In other words, these

* typedefs live at a different point on the speed/space tradeoff curve.)

*/

/* UINT8 must hold at least the values 0..255. */

#ifdef HAVE_UNSIGNED_CHAR

typedef unsigned char UINT8;

#else /* not HAVE_UNSIGNED_CHAR */

#ifdef CHAR_IS_UNSIGNED

typedef char UINT8;

#else /* not CHAR_IS_UNSIGNED */

typedef short UINT8;

#endif /* CHAR_IS_UNSIGNED */

#endif /* HAVE_UNSIGNED_CHAR */

/* UINT16 must hold at least the values 0..65535. */

#ifdef HAVE_UNSIGNED_SHORT

typedef unsigned short UINT16;

#else /* not HAVE_UNSIGNED_SHORT */

typedef unsigned int UINT16;

#endif /* HAVE_UNSIGNED_SHORT */

/* INT16 must hold at least the values -32768..32767. */

#ifndef XMD_H /* X11/xmd.h correctly defines INT16 */

typedef short INT16;

#endif

/* INT32 must hold at least signed 32-bit values. */

#ifndef XMD_H /* X11/xmd.h correctly defines INT32 */

#ifndef _BASETSD_H_ /* Microsoft defines it in basetsd.h */

#ifndef _BASETSD_H /* MinGW is slightly different */

#ifndef QGLOBAL_H /* Qt defines it in qglobal.h */

typedef long INT32;

#endif

#endif

#endif

#endif

/* Datatype used for image dimensions. The JPEG standard only supports

* images up to 64K*64K due to 16-bit fields in SOF markers. Therefore

* "unsigned int" is sufficient on all machines. However, if you need to

* handle larger images and you don't mind deviating from the spec, you

* can change this datatype.

*/

typedef unsigned int JDIMENSION;

#define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */

/* These macros are used in all function definitions and extern declarations.

* You could modify them if you need to change function linkage conventions;

* in particular, you'll need to do that to make the library a Windows DLL.

* Another application is to make all functions global for use with debuggers

* or code profilers that require it.

*/

/* a function called through method pointers: */

#define METHODDEF(type) static type

/* a function used only in its module: */

#define LOCAL(type) static type

/* a function referenced thru EXTERNs: */

#define GLOBAL(type) type

/* a reference to a GLOBAL function: */

#define EXTERN(type) extern type

/* This macro is used to declare a "method", that is, a function pointer.

* We want to supply prototype parameters if the compiler can cope.

* Note that the arglist parameter must be parenthesized!

* Again, you can customize this if you need special linkage keywords.

*/

#ifdef HAVE_PROTOTYPES

#define JMETHOD(type,methodname,arglist) type (*methodname) arglist

#else

#define JMETHOD(type,methodname,arglist) type (*methodname) ()

#endif

/* Here is the pseudo-keyword for declaring pointers that must be "far"

* on 80x86 machines. Most of the specialized coding for 80x86 is handled

* by just saying "FAR *" where such a pointer is needed. In a few places

* explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.

*/

#ifndef FAR

#ifdef NEED_FAR_POINTERS

#define FAR far

#else

#define FAR

#endif

#endif

/*

* On a few systems, type boolean and/or its values FALSE, TRUE may appear

* in standard header files. Or you may have conflicts with application-

* specific header files that you want to include together with these files.

* Defining HAVE_BOOLEAN before including jpeglib.h should make it work.

*/

#ifndef HAVE_BOOLEAN

typedef int boolean;

#endif

#ifndef FALSE /* in case these macros already exist */

#define FALSE 0 /* values of boolean */

#endif

#ifndef TRUE

#define TRUE 1

#endif

/*

* The remaining options affect code selection within the JPEG library,

* but they don't need to be visible to most applications using the library.

* To minimize application namespace pollution, the symbols won't be

* defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.

*/

#ifdef JPEG_INTERNALS

#define JPEG_INTERNAL_OPTIONS

#endif

#ifdef JPEG_INTERNAL_OPTIONS

/*

* These defines indicate whether to include various optional functions.

* Undefining some of these symbols will produce a smaller but less capable

* library. Note that you can leave certain source files out of the

* compilation/linking process if you've #undef'd the corresponding symbols.

* (You may HAVE to do that if your compiler doesn't like null source files.)

*/

/* Capability options common to encoder and decoder: */

#define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */

#define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */

#define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */

/* Encoder capability options: */

#define C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */

#define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */

#define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/

#define DCT_SCALING_SUPPORTED /* Input rescaling via DCT? (Requires DCT_ISLOW)*/

#define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */

/* Note: if you selected 12-bit data precision, it is dangerous to turn off

* ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit

* precision, so jchuff.c normally uses entropy optimization to compute

* usable tables for higher precision. If you don't want to do optimization,

* you'll have to supply different default Huffman tables.

* The exact same statements apply for progressive JPEG: the default tables

* don't work for progressive mode. (This may get fixed, however.)

*/

#define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */

/* Decoder capability options: */

#define D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */

#define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */

#define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/

#define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */

#define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */

#define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */

#undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */

#define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */

#define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */

#define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */

/* more capability options later, no doubt */

/*

* Ordering of RGB data in scanlines passed to or from the application.

* If your application wants to deal with data in the order B,G,R, just

* change these macros. You can also deal with formats such as R,G,B,X

* (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing

* the offsets will also change the order in which colormap data is organized.

* RESTRICTIONS:

* 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.

* 2. The color quantizer modules will not behave desirably if RGB_PIXELSIZE

* is not 3 (they don't understand about dummy color components!). So you

* can't use color quantization if you change that value.

*/

#define RGB_RED 0 /* Offset of Red in an RGB scanline element */

#define RGB_GREEN 1 /* Offset of Green */

#define RGB_BLUE 2 /* Offset of Blue */

#define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */

/* Definitions for speed-related optimizations. */

/* If your compiler supports inline functions, define INLINE

* as the inline keyword; otherwise define it as empty.

*/

#ifndef INLINE

#ifdef __GNUC__ /* for instance, GNU C knows about inline */

#define INLINE __inline__

#endif

#ifndef INLINE

#define INLINE /* default is to define it as empty */

#endif

#endif

/* On some machines (notably 68000 series) "int" is 32 bits, but multiplying

* two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER

* as short on such a machine. MULTIPLIER must be at least 16 bits wide.

*/

#ifndef MULTIPLIER

#define MULTIPLIER int /* type for fastest integer multiply */

#endif

/* FAST_FLOAT should be either float or double, whichever is done faster

* by your compiler. (Note that this type is only used in the floating point

* DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)

* Typically, float is faster in ANSI C compilers, while double is faster in

* pre-ANSI compilers (because they insist on converting to double anyway).

* The code below therefore chooses float if we have ANSI-style prototypes.

*/

#ifndef FAST_FLOAT

#ifdef HAVE_PROTOTYPES

#define FAST_FLOAT float

#else

#define FAST_FLOAT double

#endif

#endif

#endif /* JPEG_INTERNAL_OPTIONS */