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Graphics: Import JPEG library code
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Oli
Oliver James
parent
7f00a8bcb4
commit
34c8704a25
91 changed files with 19041 additions and 7044 deletions
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@ -2,6 +2,7 @@
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* jinclude.h
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*
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* Copyright (C) 1991-1994, Thomas G. Lane.
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* Modified 2017-2022 by Guido Vollbeding.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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@ -10,16 +11,13 @@
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* care of by the standard jconfig symbols, but on really weird systems
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* you may have to edit this file.)
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*
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* NOTE: this file is NOT intended to be included by applications using the
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* JPEG library. Most applications need only include jpeglib.h.
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* NOTE: this file is NOT intended to be included by applications using
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* the JPEG library. Most applications need only include jpeglib.h.
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*/
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/* Include auto-config file to find out which system include files we need. */
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#ifndef __jinclude_h__
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#define __jinclude_h__
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#include "jconfig.h" /* auto configuration options */
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#define JCONFIG_INCLUDED /* so that jpeglib.h doesn't do it again */
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@ -86,112 +84,74 @@
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* The modules that use fread() and fwrite() always invoke them through
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* these macros. On some systems you may need to twiddle the argument casts.
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* CAUTION: argument order is different from underlying functions!
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*
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* Furthermore, macros are provided for fflush() and ferror() in order
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* to facilitate adaption by applications using an own FILE class.
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*
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* You can define your own custom file I/O functions in jconfig.h and
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* #define JPEG_HAVE_FILE_IO_CUSTOM there to prevent redefinition here.
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*
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* You can #define JPEG_USE_FILE_IO_CUSTOM in jconfig.h to use custom file
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* I/O functions implemented in Delphi VCL (Visual Component Library)
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* in Vcl.Imaging.jpeg.pas for the TJPEGImage component utilizing
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* the Delphi RTL (Run-Time Library) TMemoryStream component:
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*
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* procedure jpeg_stdio_src(var cinfo: jpeg_decompress_struct;
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* input_file: TStream); external;
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*
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* procedure jpeg_stdio_dest(var cinfo: jpeg_compress_struct;
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* output_file: TStream); external;
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*
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* function jfread(var buf; recsize, reccount: Integer; S: TStream): Integer;
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* begin
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* Result := S.Read(buf, recsize * reccount);
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* end;
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*
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* function jfwrite(const buf; recsize, reccount: Integer; S: TStream): Integer;
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* begin
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* Result := S.Write(buf, recsize * reccount);
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* end;
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*
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* function jfflush(S: TStream): Integer;
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* begin
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* Result := 0;
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* end;
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*
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* function jferror(S: TStream): Integer;
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* begin
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* Result := 0;
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* end;
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*
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* TMemoryStream of Delphi RTL has the distinctive feature to provide dynamic
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* memory buffer management with a file/stream-based interface, particularly for
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* the write (output) operation, which is easier to apply compared with direct
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* implementations as given in jdatadst.c for memory destination. Those direct
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* implementations of dynamic memory write tend to be more difficult to use,
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* so providing an option like TMemoryStream may be a useful alternative.
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*
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* The CFile/CMemFile classes of the Microsoft Foundation Class (MFC) Library
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* may be used in a similar fashion.
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*/
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#ifndef JPEG_HAVE_FILE_IO_CUSTOM
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#ifdef JPEG_USE_FILE_IO_CUSTOM
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extern size_t jfread(void * __ptr, size_t __size, size_t __n, FILE * __stream);
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extern size_t jfwrite(const void * __ptr, size_t __size, size_t __n, FILE * __stream);
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extern int jfflush(FILE * __stream);
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extern int jferror(FILE * __fp);
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#define JFREAD(file,buf,sizeofbuf) \
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((size_t) jfread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
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#define JFWRITE(file,buf,sizeofbuf) \
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((size_t) jfwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
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#define JFFLUSH(file) jfflush(file)
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#define JFERROR(file) jferror(file)
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#else
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#define JFREAD(file,buf,sizeofbuf) \
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((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
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#define JFWRITE(file,buf,sizeofbuf) \
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((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
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typedef enum { /* JPEG marker codes */
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M_SOF0 = 0xc0,
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M_SOF1 = 0xc1,
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M_SOF2 = 0xc2,
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M_SOF3 = 0xc3,
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M_SOF5 = 0xc5,
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M_SOF6 = 0xc6,
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M_SOF7 = 0xc7,
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M_JPG = 0xc8,
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M_SOF9 = 0xc9,
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M_SOF10 = 0xca,
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M_SOF11 = 0xcb,
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M_SOF13 = 0xcd,
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M_SOF14 = 0xce,
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M_SOF15 = 0xcf,
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M_DHT = 0xc4,
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M_DAC = 0xcc,
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M_RST0 = 0xd0,
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M_RST1 = 0xd1,
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M_RST2 = 0xd2,
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M_RST3 = 0xd3,
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M_RST4 = 0xd4,
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M_RST5 = 0xd5,
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M_RST6 = 0xd6,
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M_RST7 = 0xd7,
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M_SOI = 0xd8,
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M_EOI = 0xd9,
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M_SOS = 0xda,
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M_DQT = 0xdb,
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M_DNL = 0xdc,
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M_DRI = 0xdd,
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M_DHP = 0xde,
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M_EXP = 0xdf,
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M_APP0 = 0xe0,
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M_APP1 = 0xe1,
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M_APP2 = 0xe2,
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M_APP3 = 0xe3,
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M_APP4 = 0xe4,
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M_APP5 = 0xe5,
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M_APP6 = 0xe6,
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M_APP7 = 0xe7,
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M_APP8 = 0xe8,
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M_APP9 = 0xe9,
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M_APP10 = 0xea,
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M_APP11 = 0xeb,
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M_APP12 = 0xec,
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M_APP13 = 0xed,
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M_APP14 = 0xee,
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M_APP15 = 0xef,
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M_JPG0 = 0xf0,
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M_JPG13 = 0xfd,
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M_COM = 0xfe,
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M_TEM = 0x01,
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M_ERROR = 0x100
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} JPEG_MARKER;
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/*
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* Figure F.12: extend sign bit.
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* On some machines, a shift and add will be faster than a table lookup.
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*/
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#ifdef AVOID_TABLES
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#define HUFF_EXTEND(x,s) ((x) < (1<<((s)-1)) ? (x) + (((-1)<<(s)) + 1) : (x))
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#else
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#define HUFF_EXTEND(x,s) ((x) < extend_test[s] ? (x) + extend_offset[s] : (x))
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static const int extend_test[16] = /* entry n is 2**(n-1) */
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{ 0, 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
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0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000 };
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#define SHIFTED_BITS_PLUS_ONE(n) (int) (((unsigned int) -1) << n) + 1
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static const int extend_offset[16] = /* entry n is (-1 << n) + 1 */
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{ 0,
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SHIFTED_BITS_PLUS_ONE (1), SHIFTED_BITS_PLUS_ONE (2), SHIFTED_BITS_PLUS_ONE (3), SHIFTED_BITS_PLUS_ONE (4),
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SHIFTED_BITS_PLUS_ONE (5), SHIFTED_BITS_PLUS_ONE (6), SHIFTED_BITS_PLUS_ONE (7), SHIFTED_BITS_PLUS_ONE (8),
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SHIFTED_BITS_PLUS_ONE (9), SHIFTED_BITS_PLUS_ONE (10), SHIFTED_BITS_PLUS_ONE (11), SHIFTED_BITS_PLUS_ONE (12),
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SHIFTED_BITS_PLUS_ONE (13), SHIFTED_BITS_PLUS_ONE (14), SHIFTED_BITS_PLUS_ONE (15) };
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#undef SHIFTED_BITS_PLUS_ONE
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#endif /* AVOID_TABLES */
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#define JFFLUSH(file) fflush(file)
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#define JFERROR(file) ferror(file)
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#endif
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#endif
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