| /* |
| * jmorecfg.h |
| * |
| * This file was part of the Independent JPEG Group's software: |
| * Copyright (C) 1991-1997, Thomas G. Lane. |
| * Modified 1997-2009 by Guido Vollbeding. |
| * Lossless JPEG Modifications: |
| * Copyright (C) 1999, Ken Murchison. |
| * libjpeg-turbo Modifications: |
| * Copyright (C) 2009, 2011, 2014-2015, 2018, 2020, 2022, D. R. Commander. |
| * For conditions of distribution and use, see the accompanying README.ijg |
| * 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. |
| */ |
| |
| |
| /* |
| * Maximum number of components (color channels) allowed in JPEG image. |
| * To meet the letter of Rec. ITU-T T.81 | ISO/IEC 10918-1, 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. |
| */ |
| |
| /* JSAMPLE should be the smallest type that will hold the values 0..255. */ |
| |
| typedef unsigned char JSAMPLE; |
| #define GETJSAMPLE(value) ((int)(value)) |
| |
| #define MAXJSAMPLE 255 |
| #define CENTERJSAMPLE 128 |
| |
| |
| /* J12SAMPLE should be the smallest type that will hold the values 0..4095. */ |
| |
| typedef short J12SAMPLE; |
| |
| #define MAXJ12SAMPLE 4095 |
| #define CENTERJ12SAMPLE 2048 |
| |
| |
| /* J16SAMPLE should be the smallest type that will hold the values 0..65535. */ |
| |
| typedef unsigned short J16SAMPLE; |
| |
| #define MAXJ16SAMPLE 65535 |
| #define CENTERJ16SAMPLE 32768 |
| |
| |
| /* 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. |
| */ |
| |
| typedef unsigned char JOCTET; |
| #define GETJOCTET(value) (value) |
| |
| |
| /* 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. */ |
| |
| typedef unsigned char UINT8; |
| |
| /* UINT16 must hold at least the values 0..65535. */ |
| |
| typedef unsigned short UINT16; |
| |
| /* 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. |
| * |
| * NOTE: The INT32 typedef dates back to libjpeg v5 (1994.) Integers were |
| * sometimes 16-bit back then (MS-DOS), which is why INT32 is typedef'd to |
| * long. It also wasn't common (or at least as common) in 1994 for INT32 to be |
| * defined by platform headers. Since then, however, INT32 is defined in |
| * several other common places: |
| * |
| * Xmd.h (X11 header) typedefs INT32 to int on 64-bit platforms and long on |
| * 32-bit platforms (i.e always a 32-bit signed type.) |
| * |
| * basetsd.h (Win32 header) typedefs INT32 to int (always a 32-bit signed type |
| * on modern platforms.) |
| * |
| * qglobal.h (Qt header) typedefs INT32 to int (always a 32-bit signed type on |
| * modern platforms.) |
| * |
| * This is a recipe for conflict, since "long" and "int" aren't always |
| * compatible types. Since the definition of INT32 has technically been part |
| * of the libjpeg API for more than 20 years, we can't remove it, but we do not |
| * use it internally any longer. We instead define a separate type (JLONG) |
| * for internal use, which ensures that internal behavior will always be the |
| * same regardless of any external headers that may be included. |
| */ |
| |
| #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. (Note that changing this datatype will |
| * potentially require modifying the SIMD code. The x86-64 SIMD extensions, |
| * in particular, assume a 32-bit JDIMENSION.) |
| */ |
| |
| 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 |
| |
| |
| /* Originally, this macro was used as a way of defining function prototypes |
| * for both modern compilers as well as older compilers that did not support |
| * prototype parameters. libjpeg-turbo has never supported these older, |
| * non-ANSI compilers, but the macro is still included because there is some |
| * software out there that uses it. |
| */ |
| |
| #define JMETHOD(type, methodname, arglist) type (*methodname) arglist |
| |
| |
| /* libjpeg-turbo no longer supports platforms that have far symbols (MS-DOS), |
| * but again, some software relies on this macro. |
| */ |
| |
| #undef FAR |
| #define FAR |
| |
| |
| /* |
| * 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 /* accurate integer method */ |
| #define DCT_IFAST_SUPPORTED /* less accurate int method [legacy feature] */ |
| #define DCT_FLOAT_SUPPORTED /* floating-point method [legacy feature] */ |
| |
| /* Encoder capability options: */ |
| |
| #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */ |
| #define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/ |
| #define C_LOSSLESS_SUPPORTED /* Lossless JPEG? */ |
| #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 and lossless JPEG: |
| * the default tables don't work for progressive mode or lossless mode. |
| * (This may get fixed, however.) |
| */ |
| #define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */ |
| |
| /* Decoder capability options: */ |
| |
| #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */ |
| #define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/ |
| #define D_LOSSLESS_SUPPORTED /* Lossless JPEG? */ |
| #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 */ |
| |
| |
| /* |
| * The RGB_RED, RGB_GREEN, RGB_BLUE, and RGB_PIXELSIZE macros are a vestigial |
| * feature of libjpeg. The idea was that, if an application developer needed |
| * to compress from/decompress to a BGR/BGRX/RGBX/XBGR/XRGB buffer, they could |
| * change these macros, rebuild libjpeg, and link their application statically |
| * with it. In reality, few people ever did this, because there were some |
| * severe restrictions involved (cjpeg and djpeg no longer worked properly, |
| * compressing/decompressing RGB JPEGs no longer worked properly, and the color |
| * quantizer wouldn't work with pixel sizes other than 3.) Furthermore, since |
| * all of the O/S-supplied versions of libjpeg were built with the default |
| * values of RGB_RED, RGB_GREEN, RGB_BLUE, and RGB_PIXELSIZE, many applications |
| * have come to regard these values as immutable. |
| * |
| * The libjpeg-turbo colorspace extensions provide a much cleaner way of |
| * compressing from/decompressing to buffers with arbitrary component orders |
| * and pixel sizes. Thus, we do not support changing the values of RGB_RED, |
| * RGB_GREEN, RGB_BLUE, or RGB_PIXELSIZE. In addition to the restrictions |
| * listed above, changing these values will also break the SIMD extensions and |
| * the regression tests. |
| */ |
| |
| #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 */ |
| |
| #define JPEG_NUMCS 17 |
| |
| #define EXT_RGB_RED 0 |
| #define EXT_RGB_GREEN 1 |
| #define EXT_RGB_BLUE 2 |
| #define EXT_RGB_PIXELSIZE 3 |
| |
| #define EXT_RGBX_RED 0 |
| #define EXT_RGBX_GREEN 1 |
| #define EXT_RGBX_BLUE 2 |
| #define EXT_RGBX_PIXELSIZE 4 |
| |
| #define EXT_BGR_RED 2 |
| #define EXT_BGR_GREEN 1 |
| #define EXT_BGR_BLUE 0 |
| #define EXT_BGR_PIXELSIZE 3 |
| |
| #define EXT_BGRX_RED 2 |
| #define EXT_BGRX_GREEN 1 |
| #define EXT_BGRX_BLUE 0 |
| #define EXT_BGRX_PIXELSIZE 4 |
| |
| #define EXT_XBGR_RED 3 |
| #define EXT_XBGR_GREEN 2 |
| #define EXT_XBGR_BLUE 1 |
| #define EXT_XBGR_PIXELSIZE 4 |
| |
| #define EXT_XRGB_RED 1 |
| #define EXT_XRGB_GREEN 2 |
| #define EXT_XRGB_BLUE 3 |
| #define EXT_XRGB_PIXELSIZE 4 |
| |
| static const int rgb_red[JPEG_NUMCS] = { |
| -1, -1, RGB_RED, -1, -1, -1, EXT_RGB_RED, EXT_RGBX_RED, |
| EXT_BGR_RED, EXT_BGRX_RED, EXT_XBGR_RED, EXT_XRGB_RED, |
| EXT_RGBX_RED, EXT_BGRX_RED, EXT_XBGR_RED, EXT_XRGB_RED, |
| -1 |
| }; |
| |
| static const int rgb_green[JPEG_NUMCS] = { |
| -1, -1, RGB_GREEN, -1, -1, -1, EXT_RGB_GREEN, EXT_RGBX_GREEN, |
| EXT_BGR_GREEN, EXT_BGRX_GREEN, EXT_XBGR_GREEN, EXT_XRGB_GREEN, |
| EXT_RGBX_GREEN, EXT_BGRX_GREEN, EXT_XBGR_GREEN, EXT_XRGB_GREEN, |
| -1 |
| }; |
| |
| static const int rgb_blue[JPEG_NUMCS] = { |
| -1, -1, RGB_BLUE, -1, -1, -1, EXT_RGB_BLUE, EXT_RGBX_BLUE, |
| EXT_BGR_BLUE, EXT_BGRX_BLUE, EXT_XBGR_BLUE, EXT_XRGB_BLUE, |
| EXT_RGBX_BLUE, EXT_BGRX_BLUE, EXT_XBGR_BLUE, EXT_XRGB_BLUE, |
| -1 |
| }; |
| |
| static const int rgb_pixelsize[JPEG_NUMCS] = { |
| -1, -1, RGB_PIXELSIZE, -1, -1, -1, EXT_RGB_PIXELSIZE, EXT_RGBX_PIXELSIZE, |
| EXT_BGR_PIXELSIZE, EXT_BGRX_PIXELSIZE, EXT_XBGR_PIXELSIZE, EXT_XRGB_PIXELSIZE, |
| EXT_RGBX_PIXELSIZE, EXT_BGRX_PIXELSIZE, EXT_XBGR_PIXELSIZE, EXT_XRGB_PIXELSIZE, |
| -1 |
| }; |
| |
| /* Definitions for speed-related optimizations. */ |
| |
| /* 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 |
| #ifndef WITH_SIMD |
| #define MULTIPLIER int /* type for fastest integer multiply */ |
| #else |
| #define MULTIPLIER short /* prefer 16-bit with SIMD for parellelism */ |
| #endif |
| #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.) |
| */ |
| |
| #ifndef FAST_FLOAT |
| #define FAST_FLOAT float |
| #endif |
| |
| #endif /* JPEG_INTERNAL_OPTIONS */ |