mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-10-31 15:05:46 +00:00
364 lines
12 KiB
C
364 lines
12 KiB
C
/*
|
|
* jmorecfg.h
|
|
*
|
|
* Copyright (C) 1991-1997, 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 long 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 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.
|
|
*/
|
|
|
|
#ifdef NEED_FAR_POINTERS
|
|
#define FAR far
|
|
#else
|
|
#define FAR
|
|
#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.)
|
|
*/
|
|
|
|
/* 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 SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */
|
|
#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.
|
|
*/
|
|
|
|
#ifndef FAST_FLOAT
|
|
#ifdef HAVE_PROTOTYPES
|
|
#define FAST_FLOAT float
|
|
#else
|
|
#define FAST_FLOAT double
|
|
#endif
|
|
#endif
|
|
|
|
#endif /* JPEG_INTERNAL_OPTIONS */
|