| /* |
| * 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. |
| */ |
| |
| /* |
| * This file has been modified for the Mozilla/Netscape environment. |
| * Modifications are distributed under the Netscape Public License and are |
| * Copyright (C) 1998 Netscape Communications Corporation. All Rights |
| * Reserved. |
| */ |
| |
| |
| /* |
| * 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; |
| |
| /* Defines for MMX/SSE2 support. */ |
| |
| #if defined(XP_WIN32) && defined(_M_IX86) && !defined(__GNUC__) |
| #define HAVE_MMX_INTEL_MNEMONICS |
| |
| /* SSE2 code appears broken for some cpus (bug 247437) */ |
| /* #define HAVE_SSE2_INTEL_MNEMONICS */ |
| #endif |
| |
| /* 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_ /* basetsd.h correctly defines INT32 */ |
| #ifndef _BASETSD_H |
| typedef long INT32; |
| #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. |
| */ |
| |
| /* Mozilla mod: IJG distribution makes boolean = int, but on Windows |
| * it's far safer to define boolean = unsigned char. Easier to switch |
| * than fight. |
| */ |
| |
| /* For some reason, on SunOS 5.3 HAVE_BOOLEAN gets defined when using |
| * gcc, but boolean doesn't. Even if you use -UHAVE_BOOLEAN, it still |
| * gets reset somewhere. |
| */ |
| #if defined(MUST_UNDEF_HAVE_BOOLEAN_AFTER_INCLUDES) && defined(HAVE_BOOLEAN) |
| #undef HAVE_BOOLEAN |
| #endif |
| #ifndef HAVE_BOOLEAN |
| typedef unsigned char 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.) |
| */ |
| |
| /* |
| * Mozilla mods here: undef some features not actually used by the browser. |
| * This reduces object code size and more importantly allows us to compile |
| * even with broken compilers that crash when fed certain modules of the |
| * IJG sources. Currently we undef: |
| * DCT_FLOAT_SUPPORTED INPUT_SMOOTHING_SUPPORTED IDCT_SCALING_SUPPORTED |
| * QUANT_1PASS_SUPPORTED QUANT_2PASS_SUPPORTED |
| */ |
| |
| /* 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 */ |
| #undef DCT_IFAST_SUPPORTED /* faster, less accurate integer method */ |
| #undef 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.) |
| */ |
| #undef INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */ |
| |
| /* TextResourceDecoder 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) */ |
| #undef 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? */ |
| #undef QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */ |
| #undef 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. |
| */ |
| |
| /* Mozilla mods here: add more ways of defining INLINE */ |
| |
| #ifndef INLINE |
| #ifdef __GNUC__ /* for instance, GNU C knows about inline */ |
| #define INLINE __inline__ |
| #endif |
| #if defined( __IBMC__ ) || defined (__IBMCPP__) |
| #define INLINE _Inline |
| #endif |
| #ifndef INLINE |
| #ifdef __cplusplus |
| #define INLINE inline /* a C++ compiler should have it too */ |
| #else |
| #define INLINE /* default is to define it as empty */ |
| #endif |
| #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 */ |
