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ijl.h
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/*M*
//
//
// INTEL CORPORATION PROPRIETARY INFORMATION
// This software is supplied under the terms of a license agreement or
// nondisclosure agreement with Intel Corporation and may not be copied
// or disclosed except in accordance with the terms of that agreement.
// Copyright (c) 1998 Intel Corporation. All Rights Reserved.
//
//
// File:
// ijl.h
//
// Purpose:
// IJL Common Header File
// This file contains: definitions for data types, data
// structures, error codes, and function prototypes used
// in the Intel(R) JPEG Library (IJL).
//
// Version:
// 1.0 beta 1
//
*M*/
#ifndef __IJL_H__
#define __IJL_H__
#if defined( __cplusplus )
extern "C" {
#endif
#ifndef IJL_ALL_WARNINGS
#if _MSC_VER >= 1000
/* nonstandard extension used : nameless struct/union */
#pragma warning(disable : 4201)
/* nonstandard extension used : bit field types other than int */
#pragma warning(disable : 4214)
/* unreferenced inline function has been removed */
#pragma warning(disable : 4514)
/* named type definition in parentheses */
#pragma warning(disable : 4115)
#endif /* _MSC_VER >= 1000 */
#endif /* IJL_ALL_WARNINGS */
#define _X86_
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#ifdef _MSC_VER
# pragma pack (8)
#endif
/* /////////////////////////////////////////////////////////////////////////
// Macros/Constants */
#define IJL_NONE 0
#define IJL_OTHER 255
#define JBUFSIZE 4096 // Size of file I/O buffer (4K).
#ifndef INT64
#define INT64 __int64
#endif
#ifndef UINT64
#define UINT64 unsigned INT64
#endif
#if defined( _IJL_STDIMP_ )
# define IJLAPI(type,name,arg) \
extern type WINAPI name arg
#else
# if !defined( _IJL_API_ )
# define IJLAPI(type,name,arg) \
extern __declspec(dllimport) type WINAPI name arg
# else
# define IJLAPI(type,name,arg) \
extern __declspec(dllexport) type WINAPI name arg
# endif // _IJL_API_
#endif //_IJL_STDIMP_
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: IJLibVersion
//
// Purpose: Stores library version info.
//
// Context:
//
// Example:
// major - 1
// minor - 0
// build - 1
// Name - "ijl10.dll"
// Version - "1.0.1 Beta1"
// InternalVersion - "1.0.1.1"
// BuildDate - "Sep 22 1998"
// CallConv - "DLL"
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef struct _IJLibVersion
{
int major;
int minor;
int build;
LPCTSTR Name;
LPCTSTR Version;
LPCTSTR InternalVersion;
LPCTSTR BuildDate;
LPCTSTR CallConv;
} IJLibVersion;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: IJLIOTYPE
//
// Purpose: Possible types of data read/write/other operations to be
// performed by the functions IJL_Read and IJL_Write.
//
// See the Developer's Guide for details on appropriate usage.
//
// Fields:
//
// IJL_JFILE_XXXXXXX Indicates JPEG data in a stdio file.
//
// IJL_JBUFF_XXXXXXX Indicates JPEG data in an addressable buffer.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef enum
{
IJL_SETUP = -1,
// Read JPEG parameters (i.e., height, width, channels,
// sampling, etc.) from a JPEG bit stream.
IJL_JFILE_READPARAMS = 0,
IJL_JBUFF_READPARAMS = 1,
// Read a JPEG Interchange Format image.
IJL_JFILE_READWHOLEIMAGE = 2,
IJL_JBUFF_READWHOLEIMAGE = 3,
// Read JPEG tables from a JPEG Abbreviated Format bit stream.
IJL_JFILE_READHEADER = 4,
IJL_JBUFF_READHEADER = 5,
// Read image info from a JPEG Abbreviated Format bit stream.
IJL_JFILE_READENTROPY = 6,
IJL_JBUFF_READENTROPY = 7,
// Write an entire JFIF bit stream.
IJL_JFILE_WRITEWHOLEIMAGE = 8,
IJL_JBUFF_WRITEWHOLEIMAGE = 9,
// Write a JPEG Abbreviated Format bit stream.
IJL_JFILE_WRITEHEADER = 10,
IJL_JBUFF_WRITEHEADER = 11,
// Write image info to a JPEG Abbreviated Format bit stream.
IJL_JFILE_WRITEENTROPY = 12,
IJL_JBUFF_WRITEENTROPY = 13,
// Scaled Decoding Options:
// Reads a JPEG image scaled to 1/2 size.
IJL_JFILE_READONEHALF = 14,
IJL_JBUFF_READONEHALF = 15,
// Reads a JPEG image scaled to 1/4 size.
IJL_JFILE_READONEQUARTER = 16,
IJL_JBUFF_READONEQUARTER = 17,
// Reads a JPEG image scaled to 1/8 size.
IJL_JFILE_READONEEIGHTH = 18,
IJL_JBUFF_READONEEIGHTH = 19,
// Reads an embedded thumbnail from a JFIF bit stream.
IJL_JFILE_READTHUMBNAIL = 20,
IJL_JBUFF_READTHUMBNAIL = 21
} IJLIOTYPE;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: IJL_COLOR
//
// Purpose: Possible color space formats.
//
// Note these formats do *not* necessarily denote
// the number of channels in the color space.
// There exists separate "channel" fields in the
// JPEG_CORE_PROPERTIES data structure specifically
// for indicating the number of channels in the
// JPEG and/or DIB color spaces.
//
// See the Developer's Guide for details on appropriate usage.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef enum
{
IJL_RGB = 1, // Red-Green-Blue color space.
IJL_BGR = 2, // Reversed channel ordering from IJL_RGB.
IJL_YCBCR = 3, // Luminance-Chrominance color space as defined
// by CCIR Recommendation 601.
IJL_G = 4, // Grayscale color space.
IJL_RGBA_FPX = 5, // FlashPix RGB 4 channel color space that
// has pre-multiplied opacity.
IJL_YCBCRA_FPX = 6 // FlashPix YCbCr 4 channel color space that
// has pre-multiplied opacity.
// IJL_OTHER // Some other color space not defined by the IJL.
// (This means no color space conversion will
// be done by the IJL.)
} IJL_COLOR;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: IJL_JPGSUBSAMPLING
//
// Purpose: Possible subsampling formats used in the JPEG.
//
// See the Developer's Guide for details on appropriate usage.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef enum
{
IJL_411 = 1, // Valid on a JPEG w/ 3 channels.
IJL_422 = 2, // Valid on a JPEG w/ 3 channels.
IJL_4114 = 3, // Valid on a JPEG w/ 4 channels.
IJL_4224 = 4, // Valid on a JPEG w/ 4 channels.
// IJL_NONE = Corresponds to "No Subsampling".
// Valid on a JPEG w/ any number of channels.
// IJL_OTHER = Valid entry, but only used internally to the IJL.
} IJL_JPGSUBSAMPLING;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: IJL_DIBSUBSAMPLING
//
// Purpose: Possible subsampling formats used in the DIB.
//
// See the Developer's Guide for details on appropriate usage.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef enum
{
// IJL_NONE = Corresponds to "No Subsampling".
} IJL_DIBSUBSAMPLING;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: HUFFMAN_TABLE
//
// Purpose: Stores Huffman table information in a fast-to-use format.
//
// Context: Used by Huffman encoder/decoder to access Huffman table
// data. Raw Huffman tables are formatted to fit this
// structure prior to use.
//
// Fields:
// huff_class 0 == DC Huffman or lossless table, 1 == AC table.
// ident Huffman table identifier, 0-3 valid (Extended Baseline).
// huffelem Huffman elements for codes <= 8 bits long;
// contains both zero run-length and symbol length in bits.
// huffval Huffman values for codes 9-16 bits in length.
// mincode Smallest Huffman code of length n.
// maxcode Largest Huffman code of length n.
// valptr Starting index into huffval[] for symbols of length k.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef struct _HUFFMAN_TABLE
{
int huff_class;
int ident;
unsigned int huffelem[256];
unsigned short huffval[256];
unsigned short mincode[17];
unsigned short maxcode[18];
unsigned short valptr[17];
} HUFFMAN_TABLE;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: JPEGHuffTable
//
// Purpose: Stores pointers to JPEG-binary spec compliant
// Huffman table information.
//
// Context: Used by interface and table methods to specify encoder
// tables to generate and store JPEG images.
//
// Fields:
// bits Points to number of codes of length i (<=16 supported).
// vals Value associated with each Huffman code.
// hclass 0 == DC table, 1 == AC table.
// ident Specifies the identifier for this table.
// 0-3 for extended JPEG compliance.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef struct
{
unsigned char* bits;
unsigned char* vals;
unsigned char hclass;
unsigned char ident;
} JPEGHuffTable;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: QUANT_TABLE
//
// Purpose: Stores quantization table information in a
// fast-to-use format.
//
// Context: Used by quantizer/dequantizer to store formatted
// quantization tables.
//
// Fields:
// precision 0 => elements contains 8-bit elements,
// 1 => elements contains 16-bit elements.
// ident Table identifier (0-3).
// elements Pointer to 64 table elements + 16 extra elements to catch
// input data errors that may cause malfunction of the
// Huffman decoder.
// elarray Space for elements (see above) plus 8 bytes to align
// to a quadword boundary.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef struct _QUANT_TABLE
{
int precision;
int ident;
short* elements;
short elarray [84];
} QUANT_TABLE;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: JPEGQuantTable
//
// Purpose: Stores pointers to JPEG binary spec compliant
// quantization table information.
//
// Context: Used by interface and table methods to specify encoder
// tables to generate and store JPEG images.
//
// Fields:
// quantizer Zig-zag order elements specifying quantization factors.
// ident Specifies identifier for this table.
// 0-3 valid for Extended Baseline JPEG compliance.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef struct
{
unsigned char* quantizer;
unsigned char ident;
} JPEGQuantTable;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: FRAME_COMPONENT
//
// Purpose: One frame-component structure is allocated per component
// in a frame.
//
// Context: Used by Huffman decoder to manage components.
//
// Fields:
// ident Component identifier. The tables use this ident to
// determine the correct table for each component.
// hsampling Horizontal subsampling factor for this component,
// 1-4 are legal.
// vsampling Vertical subsampling factor for this component,
// 1-4 are legal.
// quant_sel Quantization table selector. The quantization table
// used by this component is determined via this selector.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef struct _FRAME_COMPONENT
{
int ident;
int hsampling;
int vsampling;
int quant_sel;
} FRAME_COMPONENT;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: FRAME
//
// Purpose: Stores frame-specific data.
//
// Context: One Frame structure per image.
//
// Fields:
// precision Sample precision in bits.
// width Width of the source image in pixels.
// height Height of the source image in pixels.
// MCUheight Height of a frame MCU.
// MCUwidth Width of a frame MCU.
// max_hsampling Max horiz sampling ratio of any component in the frame.
// max_vsampling Max vert sampling ratio of any component in the frame.
// ncomps Number of components/channels in the frame.
// horMCU Number of horizontal MCUs in the frame.
// totalMCU Total number of MCUs in the frame.
// comps Array of 'ncomps' component descriptors.
// restart_interv Indicates number of MCUs after which to restart the
// entropy parameters.
// SeenAllDCScans Used when decoding Multiscan images to determine if
// all channels of an image have been decoded.
// SeenAllACScans (See SeenAllDCScans)
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef struct _FRAME
{
int precision;
int width;
int height;
int MCUheight;
int MCUwidth;
int max_hsampling;
int max_vsampling;
int ncomps;
int horMCU;
long totalMCU;
FRAME_COMPONENT* comps;
int restart_interv;
int SeenAllDCScans;
int SeenAllACScans;
} FRAME;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: SCAN_COMPONENT
//
// Purpose: One scan-component structure is allocated per component
// of each scan in a frame.
//
// Context: Used by Huffman decoder to manage components within scans.
//
// Fields:
// comp Component number, index to the comps member of FRAME.
// hsampling Horizontal sampling factor.
// vsampling Vertical sampling factor.
// dc_table DC Huffman table pointer for this scan.
// ac_table AC Huffman table pointer for this scan.
// quant_table Quantization table pointer for this scan.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef struct
{
int comp;
int hsampling;
int vsampling;
HUFFMAN_TABLE* dc_table;
HUFFMAN_TABLE* ac_table;
QUANT_TABLE* quant_table;
} SCAN_COMPONENT;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: SCAN
//
// Purpose: One SCAN structure is allocated per scan in a frame.
//
// Context: Used by Huffman decoder to manage scans.
//
// Fields:
// ncomps Number of image components in a scan, 1-4 legal.
// gray_scale If TRUE, decode only the Y channel.
// start_spec Start coefficient of spectral or predictor selector.
// end_spec End coefficient of spectral selector.
// approx_high High bit position in successive approximation
// Progressive coding.
// approx_low Low bit position in successive approximation
// Progressive coding.
// restart_interv Restart interval, 0 if disabled.
// curxMCU Next horizontal MCU index to be processed after
// an interrupted SCAN.
// curyMCU Next vertical MCU index to be processed after
// an interrupted SCAN.
// dc_diff Array of DC predictor values for DPCM modes.
// comps Array of ncomps SCAN_COMPONENT component identifiers.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef struct _SCAN
{
int ncomps;
int gray_scale;
int start_spec;
int end_spec;
int approx_high;
int approx_low;
UINT restart_interv;
DWORD curxMCU;
DWORD curyMCU;
int dc_diff[4];
SCAN_COMPONENT* comps;
} SCAN;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: DCTTYPE
//
// Purpose: Possible algorithms to be used to perform the discrete
// cosine transform (DCT).
//
// Fields:
// IJL_AAN The AAN (Arai, Agui, and Nakajima) algorithm from
// Trans. IEICE, vol. E 71(11), 1095-1097, Nov. 1988.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef enum
{
IJL_AAN = 0
} DCTTYPE;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: PROCESSOR_TYPE
//
// Purpose: Possible types of processors.
// Note that the enums are defined in ascending order
// depending upon their various IA32 instruction support.
//
// Fields:
//
// IJL_OTHER_PROC
// Does not support the CPUID instruction and
// assumes no Pentium(R) processor instructions.
//
// IJL_PENTIUM_PROC
// Corresponds to an Intel(R) Pentium(R) processor
// (or a 100% compatible) that supports the
// Pentium(R) processor instructions.
//
// IJL_PENTIUM_PRO_PROC
// Corresponds to an Intel(R) Pentium(R) Pro processor
// (or a 100% compatible) that supports the
// Pentium(R) Pro processor instructions.
//
// IJL_PENTIUM_PROC_MMX_TECH
// Corresponds to an Intel(R) Pentium(R) processor
// with MMX(TM) technology (or a 100% compatible)
// that supports the MMX(TM) instructions.
//
// IJL_PENTIUM_II_PROC
// Corresponds to an Intel(R) Pentium(R) II processor
// (or a 100% compatible) that supports both the
// Pentium(R) Pro processor instructions and the
// MMX(TM) instructions.
//
// Any additional processor types that support a superset
// of both the Pentium(R) Pro processor instructions and the
// MMX(TM) instructions should be given an enum value greater
// than IJL_PENTIUM_II_PROC.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef enum
{
IJL_OTHER_PROC = 0,
IJL_PENTIUM_PROC = 1,
IJL_PENTIUM_PRO_PROC = 2,
IJL_PENTIUM_PROC_MMX_TECH = 3,
IJL_PENTIUM_II_PROC = 4
} PROCESSOR_TYPE;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: ENTROPYSTRUCT
//
// Purpose: Stores the decoder state information necessary to "jump"
// to a particular MCU row in a compressed entropy stream.
//
// Context: Used to persist the decoder state within Decode_Scan when
// decoding using ROIs.
//
// Fields:
// offset Offset (in bytes) into the entropy stream
// from the beginning.
// dcval1 DC val at the beginning of the MCU row
// for component 1.
// dcval2 DC val at the beginning of the MCU row
// for component 2.
// dcval3 DC val at the beginning of the MCU row
// for component 3.
// dcval4 DC val at the beginning of the MCU row
// for component 4.
// bit_buffer_64 64-bit Huffman bit buffer. Stores current
// bit buffer at the start of a MCU row.
// Also used as a 32-bit buffer on 32-bit
// architectures.
// bitbuf_bits_valid Number of valid bits in the above bit buffer.
// unread_marker Have any markers been decoded but not
// processed at the beginning of a MCU row?
// This entry holds the unprocessed marker, or
// 0 if none.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef struct
{
DWORD offset;
int dcval1;
int dcval2;
int dcval3;
int dcval4;
UINT64 bit_buffer_64;
int bitbuf_bits_valid;
BYTE unread_marker;
} ENTROPYSTRUCT;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: STATE
//
// Purpose: Stores the active state of the IJL.
//
// Context: Used by all low-level routines to store pseudo-global or
// state variables.
//
// Fields:
// bit_buffer_64 64-bit bitbuffer utilized by Huffman
// encoder/decoder algorithms utilizing routines
// designed for MMX(TM) technology.
// bit_buffer_32 32-bit bitbuffer for all other Huffman
// encoder/decoder algorithms.
// bitbuf_bits_valid Number of bits in the above two fields that
// are valid.
//
// cur_entropy_ptr Current position (absolute address) in
// the entropy buffer.
// start_entropy_ptr Starting position (absolute address) of
// the entropy buffer.
// end_entropy_ptr Ending position (absolute address) of
// the entropy buffer.
// entropy_bytes_processed Number of bytes actually processed
// (passed over) in the entropy buffer.
// entropy_buf_maxsize Max size of the entropy buffer.
// entropy_bytes_left Number of bytes left in the entropy buffer.
// Prog_EndOfBlock_Run Progressive block run counter.
//
// DIB_ptr Temporary offset into the input/output DIB.
//
// unread_marker If a marker has been read but not processed,
// stick it in this field.
// processor_type (0, 1, or 2) == current processor does not
// support MMX(TM) instructions.
// (3 or 4) == current processor does
// support MMX(TM) instructions.
// cur_scan_comp On which component of the scan are we working?
// file Process file handle, or
// 0x00000000 if no file is defined.
// JPGBuffer Entropy buffer (~4K).
//
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef struct _STATE
{
// Bit buffer.
UINT64 bit_buffer_64;
DWORD bit_buffer_32;
int bitbuf_bits_valid;
// Entropy.
BYTE* cur_entropy_ptr;
BYTE* start_entropy_ptr;
BYTE* end_entropy_ptr;
long entropy_bytes_processed;
long entropy_buf_maxsize;
int entropy_bytes_left;
int Prog_EndOfBlock_Run;
// Input or output DIB.
BYTE* DIB_ptr;
// Control.
BYTE unread_marker;
PROCESSOR_TYPE processor_type;
int cur_scan_comp;
HANDLE file;
BYTE JPGBuffer [JBUFSIZE];
} STATE;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: FAST_MCU_PROCESSING_TYPE
//
// Purpose: Advanced Control Option. Do NOT modify.
// WARNING: Used for internal reference only.
//
// Fields:
//
// IJL_(sampling)_(JPEG color space)_(sampling)_(DIB color space)
// Decode is read left to right w/ upsampling.
// Encode is read right to left w/ subsampling.
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef enum
{
IJL_NO_CC_OR_US = 0,
IJL_111_YCBCR_111_RGB = 1,
IJL_111_YCBCR_111_BGR = 2,
IJL_411_YCBCR_111_RGB = 3,
IJL_411_YCBCR_111_BGR = 4,
IJL_422_YCBCR_111_RGB = 5,
IJL_422_YCBCR_111_BGR = 6,
IJL_111_YCBCR_1111_RGBA_FPX = 7,
IJL_411_YCBCR_1111_RGBA_FPX = 8,
IJL_422_YCBCR_1111_RGBA_FPX = 9,
IJL_1111_YCBCRA_FPX_1111_RGBA_FPX = 10,
IJL_4114_YCBCRA_FPX_1111_RGBA_FPX = 11,
IJL_4224_YCBCRA_FPX_1111_RGBA_FPX = 12,
IJL_111_RGB_1111_RGBA_FPX = 13,
IJL_1111_RGBA_FPX_1111_RGBA_FPX = 14
} FAST_MCU_PROCESSING_TYPE;
/*D*
////////////////////////////////////////////////////////////////////////////
// Name: JPEG_PROPERTIES
//
// Purpose: Stores low-level and control information. It is used by
// both the encoder and decoder. An advanced external user
// may access this structure to expand the interface
// capability.
//
// See the Developer's Guide for an expanded description
// of this structure and its use.
//
// Context: Used by all interface methods and most IJL routines.
//
// Fields:
//
// iotype IN: Specifies type of data operation
// (read/write/other) to be
// performed by IJL_Read or IJL_Write.
// roi IN: Rectangle-Of-Interest to read from, or
// write to, in pixels.
// dcttype IN: DCT alogrithm to be used.
// fast_processing OUT: Supported fast pre/post-processing path.
// This is set by the IJL.
// interrupt IN: Signals an interrupt has been requested.
//
// DIBBytes IN: Pointer to buffer of uncompressed data.
// DIBWidth IN: Width of uncompressed data.
// DIBHeight IN: Height of uncompressed data.
// DIBPadBytes IN: Padding (in bytes) at end of each
// row in the uncompressed data.
// DIBChannels IN: Number of components in the
// uncompressed data.
// DIBColor IN: Color space of uncompressed data.
// DIBSubsampling IN: Required to be IJL_NONE.
// DIBLineBytes OUT: Number of bytes in an output DIB line
// including padding.
//
// JPGFile IN: Pointer to file based JPEG.
// JPGBytes IN: Pointer to buffer based JPEG.
// JPGSizeBytes IN: Max buffer size. Used with JPGBytes.
// OUT: Number of compressed bytes written.
// JPGWidth IN: Width of JPEG image.
// OUT: After reading (except READHEADER).
// JPGHeight IN: Height of JPEG image.
// OUT: After reading (except READHEADER).
// JPGChannels IN: Number of components in JPEG image.
// OUT: After reading (except READHEADER).
// JPGColor IN: Color space of JPEG image.
// JPGSubsampling IN: Subsampling of JPEG image.
// OUT: After reading (except READHEADER).
// JPGThumbWidth OUT: JFIF embedded thumbnail width [0-255].
// JPGThumbHeight OUT: JFIF embedded thumbnail height [0-255].
//
// cconversion_reqd OUT: If color conversion done on decode, TRUE.
// upsampling_reqd OUT: If upsampling done on decode, TRUE.
// jquality IN: [0-100] where highest quality is 100.
// jinterleaveType IN/OUT: 0 => MCU interleaved file, and
// 1 => 1 scan per component.
// numxMCUs OUT: Number of MCUs in the x direction.
// numyMCUs OUT: Number of MCUs in the y direction.
//
// nqtables IN/OUT: Number of quantization tables.
// maxquantindex IN/OUT: Maximum index of quantization tables.
// nhuffActables IN/OUT: Number of AC Huffman tables.
// nhuffDctables IN/OUT: Number of DC Huffman tables.
// maxhuffindex IN/OUT: Maximum index of Huffman tables.
// jFmtQuant IN/OUT: Formatted quantization table info.
// jFmtAcHuffman IN/OUT: Formatted AC Huffman table info.
// jFmtDcHuffman IN/OUT: Formatted DC Huffman table info.
//
// jEncFmtQuant IN/OUT: Pointer to one of the above, or
// to externally persisted table.
// jEncFmtAcHuffman IN/OUT: Pointer to one of the above, or
// to externally persisted table.
// jEncFmtDcHuffman IN/OUT: Pointer to one of the above, or
// to externally persisted table.
//
// use_default_qtables IN: Set to default quantization tables.
// Clear to supply your own.
// use_default_htables IN: Set to default Huffman tables.
// Clear to supply your own.
// rawquanttables IN: Up to 4 sets of quantization tables.
// rawhufftables IN: Alternating pairs (DC/AC) of up to 4
// sets of raw Huffman tables.
// HuffIdentifierAC IN: Indicates what channel the user-
// supplied Huffman AC tables apply to.
// HuffIdentifierDC IN: Indicates what channel the user-
// supplied Huffman DC tables apply to.
//
// jframe OUT: Structure with frame-specific info.
// needframe OUT: TRUE when a frame has been detected.
//
// jscan Persistence for current scan pointer when
// interrupted.
//
// state OUT: Contains info on the state of the IJL.
// SawAdobeMarker OUT: Decoder saw an APP14 marker somewhere.
// AdobeXform OUT: If SawAdobeMarker TRUE, this indicates
// the JPEG color space given by that marker.
//
// rowoffsets Persistence for the decoder MCU row origins
// when decoding by ROI. Offsets (in bytes
// from the beginning of the entropy data)
// to the start of each of the decoded rows.
// Fill the offsets with -1 if they have not
// been initalized and NULL could be the
// offset to the first row.
//
// MCUBuf OUT: Quadword aligned internal buffer.
// Big enough for the largest MCU
// (10 blocks) with extra room for
// additional operations.
// tMCUBuf OUT: Version of above, without alignment.
//
// processor_type OUT: Determines type of processor found
// during initialization.
//
// ignoreDCTs IN: Assert to bypass DCTs when processing
// data. Required for conformance
// testing.
//
// progressive_found OUT: 1 when progressive image detected.
// coef_buffer IN: Pointer to a larger buffer containing
// frequency coefficients when they
// cannot be decoded dynamically
// (i.e., as in progressive decoding).
//
////////////////////////////////////////////////////////////////////////////
*D*/
typedef struct
{
// Compression/Decompression control.
IJLIOTYPE iotype; // default = IJL_SETUP
RECT roi; // default = 0
DCTTYPE dcttype; // default = IJL_AAN
FAST_MCU_PROCESSING_TYPE fast_processing; // default = IJL_NO_CC_OR_US
DWORD interrupt; // default = FALSE
// DIB specific I/O data specifiers.
BYTE* DIBBytes; // default = NULL
DWORD DIBWidth; // default = 0
int DIBHeight; // default = 0
DWORD DIBPadBytes; // default = 0
DWORD DIBChannels; // default = 3
IJL_COLOR DIBColor; // default = IJL_BGR
IJL_DIBSUBSAMPLING DIBSubsampling; // default = IJL_NONE
int DIBLineBytes; // default = 0
// JPEG specific I/O data specifiers.
LPTSTR JPGFile; // default = NULL
BYTE* JPGBytes; // default = NULL
DWORD JPGSizeBytes; // default = 0
DWORD JPGWidth; // default = 0
DWORD JPGHeight; // default = 0
DWORD JPGChannels; // default = 3
IJL_COLOR JPGColor; // default = IJL_YCBCR
IJL_JPGSUBSAMPLING JPGSubsampling; // default = IJL_411
DWORD JPGThumbWidth; // default = 0
DWORD JPGThumbHeight; // default = 0
// JPEG conversion properties.
DWORD cconversion_reqd; // default = TRUE
DWORD upsampling_reqd; // default = TRUE
DWORD jquality; // default = 75
DWORD jinterleaveType; // default = 0
DWORD numxMCUs; // default = 0
DWORD numyMCUs; // default = 0
// Tables.
DWORD nqtables;
DWORD maxquantindex;
DWORD nhuffActables;
DWORD nhuffDctables;
DWORD maxhuffindex;
QUANT_TABLE jFmtQuant[4];
HUFFMAN_TABLE jFmtAcHuffman[4];
HUFFMAN_TABLE jFmtDcHuffman[4];