//  * jmorecfg.h
//  *
//  * Copyright (C) 1991-1995, Thomas G. Lane.
//  * 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 
typedef int INT32;
#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 defines are used in all function definitions and extern declarations.
//  * You could modify them if you need to change function linkage conventions.
//  * Another application is to make all functions global for use with debuggers
//  * or code profilers that require it.

#define METHODDEF static	// a function called through method pointers 
#define LOCAL	  static	// a function used only in its module 
#define GLOBAL			// a function referenced thru EXTERNs 
#define EXTERN	  extern	// a reference to a GLOBAL function 


//  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.

#define HAVE_BOOLEAN

#ifndef boolean
//typedef int boolean;
#define boolean int
#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.)

// Arithmetic coding is unsupported for legal reasons.  Complaints to IBM. 

// 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: 

#undef  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 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: 

#undef  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 BLOCK_SMOOTHING_SUPPORTED   // Block smoothing? (Progressive only) 
#define IDCT_SCALING_SUPPORTED	    // Output rescaling via IDCT? 
#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. These macros only affect RGB<=>YCbCr color conversion, so they are not
//  *    useful if you are using JPEG color spaces other than YCbCr or grayscale.
//  * 3. 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.
#define FAST_FLOAT  float
// #ifndef FAST_FLOAT
// #ifdef HAVE_PROTOTYPES
// #define FAST_FLOAT  float
// #else
// #define FAST_FLOAT  double
// #endif
// #endif
#endif // JPEG_INTERNAL_OPTIONS