    /*
     * jmorecfg.h
     *
     * Copyright (C) 1991-1997, Thomas G. Lane.
     * Modified 1997-2013 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)
     *   9   for 9-bit sample values
     *   10  for 10-bit sample values
     *   11  for 11-bit sample values
     *   12  for 12-bit sample values
     * Only 8, 9, 10, 11, and 12 bits sample data precision are supported for
     * full-feature DCT processing.  Further depths up to 16-bit may be added
     * later for the lossless modes of operation.
     * Run-time selection and conversion of data precision will be added later
     * and are currently not supported, sorry.
     * Exception:  The transcoding part (jpegtran) supports all settings in a
     * single instance, since it operates on the level of DCT coefficients and
     * not sample values.  The DCT coefficients are of the same type (16 bits)
     * in all cases (see below).
     */

    #define BITS_IN_JSAMPLE  8	/* use 8, 9, 10, 11, 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 == 9
    /* JSAMPLE should be the smallest type that will hold the values 0..511.
     * On nearly all machines "short" will do nicely.
     */

    typedef short JSAMPLE;
    #define GETJSAMPLE(value)  ((int) (value))

    #define MAXJSAMPLE	511
    #define CENTERJSAMPLE	256

    #endif /* BITS_IN_JSAMPLE == 9 */

    #if BITS_IN_JSAMPLE == 10
    /* JSAMPLE should be the smallest type that will hold the values 0..1023.
     * On nearly all machines "short" will do nicely.
     */

    typedef short JSAMPLE;
    #define GETJSAMPLE(value)  ((int) (value))

    #define MAXJSAMPLE	1023
    #define CENTERJSAMPLE	512

    #endif /* BITS_IN_JSAMPLE == 10 */

    #if BITS_IN_JSAMPLE == 11
    /* JSAMPLE should be the smallest type that will hold the values 0..2047.
     * On nearly all machines "short" will do nicely.
     */

    typedef short JSAMPLE;
    #define GETJSAMPLE(value)  ((int) (value))

    #define MAXJSAMPLE	2047
    #define CENTERJSAMPLE	1024

    #endif /* BITS_IN_JSAMPLE == 11 */

    #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

    /* The noreturn type identifier is used to declare functions
     * which cannot return.
     * Compilers can thus create more optimized code and perform
     * better checks for warnings and errors.
     * Static analyzer tools can make improved inferences about
     * execution paths and are prevented from giving false alerts.
     *
     * Unfortunately, the proposed specifications of corresponding
     * extensions in the Dec 2011 ISO C standard revision (C11),
     * GCC, MSVC, etc. are not viable.
     * Thus we introduce a user defined type to declare noreturn
     * functions at least for clarity.  A proper compiler would
     * have a suitable noreturn type to match in place of void.
     */

    #ifndef HAVE_NORETURN_T
    typedef void noreturn_t;
    #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
    #if defined FALSE || defined TRUE || defined QGLOBAL_H
    /* Qt3 defines FALSE and TRUE as "const" variables in qglobal.h */
    typedef int boolean;
    #ifndef FALSE			/* in case these macros already exist */
    #define FALSE	0		/* values of boolean */
    #endif
    #ifndef TRUE
    #define TRUE	1
    #endif
    #else
    typedef enum { FALSE = 0, TRUE = 1 } boolean;
    #endif
    #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 more than 8-bit data precision, it is dangerous to
     * turn off ENTROPY_OPT_SUPPORTED.  The standard Huffman tables are only
     * good for 8-bit precision, so arithmetic coding is recommended for higher
     * precision.  The Huffman encoder normally uses entropy optimization to
     * compute usable tables for higher precision.  Otherwise, 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? (Requires DCT_ISLOW)*/
    #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 */