text: /* +------------------------------------------------------------------------+
     |                     Mobile Robot Programming Toolkit (MRPT)            |
     |                          http://www.mrpt.org/                          |
     |                                                                        |
     | Copyright (c) 2005-2018, Individual contributors, see AUTHORS file     |
     | See: http://www.mrpt.org/Authors - All rights reserved.                |
     | Released under BSD License. See details in http://www.mrpt.org/License |
     +------------------------------------------------------------------------+ */
  
  #ifndef JPEGLIB_H
  #define JPEGLIB_H
  
  /*
   * First we include the configuration files that record how this
   * installation of the JPEG library is set up.  mrpt_jconfig.h can be
   * generated automatically for many systems.  jmorecfg.h contains
   * manual configuration options that most people need not worry about.
   */
  
  #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */
  #include "mrpt_jconfig.h" /* widely used configuration options */
  #endif
  #include "jmorecfg.h" /* seldom changed options */
  
  /* Version ID for the JPEG library.
   * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60".
   */
  
  #define JPEG_LIB_VERSION 62 /* Version 6b */
  
  /* Various constants determining the sizes of things.
   * All of these are specified by the JPEG standard, so don't change them
   * if you want to be compatible.
   */
  
  #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */
  #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */
  #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */
  #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */
  #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */
  #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */
  #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */
  /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
   * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
   * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
   * to handle it.  We even let you do this from the mrpt_jconfig.h file. However,
   * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
   * sometimes emits noncompliant files doesn't mean you should too.
   */
  #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */
  #ifndef D_MAX_BLOCKS_IN_MCU
  #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */
  #endif
  
  /* Data structures for images (arrays of samples and of DCT coefficients).
   * On 80x86 machines, the image arrays are too big for near pointers,
   * but the pointer arrays can fit in near memory.
   */
  
  typedef JSAMPLE FAR* JSAMPROW; /* ptr to one image row of pixel samples. */
  typedef JSAMPROW* JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */
  typedef JSAMPARRAY* JSAMPIMAGE; /* a 3-D sample array: top index is color */
  
  typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */
  typedef JBLOCK FAR* JBLOCKROW; /* pointer to one row of coefficient blocks */
  typedef JBLOCKROW* JBLOCKARRAY; /* a 2-D array of coefficient blocks */
  typedef JBLOCKARRAY* JBLOCKIMAGE; /* a 3-D array of coefficient blocks */
  
  typedef JCOEF FAR* JCOEFPTR; /* useful in a couple of places */
  
  /* Types for JPEG compression parameters and working tables. */
  
  /* DCT coefficient quantization tables. */
  
  typedef struct
  {
  	/* This array gives the coefficient quantizers in natural array order
  	 * (not the zigzag order in which they are stored in a JPEG DQT marker).
  	 * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
  	 */
  	UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */
  	/* This field is used only during compression.  It's initialized FALSE when
  	 * the table is created, and set TRUE when it's been output to the file.
  	 * You could suppress output of a table by setting this to TRUE.
  	 * (See jpeg_suppress_tables for an example.)
  	 */
  	boolean sent_table; /* TRUE when table has been output */
  } JQUANT_TBL;
  
  /* Huffman coding tables. */
  
  typedef struct
  {
  	/* These two fields directly represent the contents of a JPEG DHT marker */
  	UINT8 bits[17]; /* bits[k] = # of symbols with codes of */
  	/* length k bits; bits[0] is unused */
  	UINT8 huffval[256]; /* The symbols, in order of incr code length */
  	/* This field is used only during compression.  It's initialized FALSE when
  	 * the table is created, and set TRUE when it's been output to the file.
  	 * You could suppress output of a table by setting this to TRUE.
  	 * (See jpeg_suppress_tables for an example.)
  	 */
  	boolean sent_table; /* TRUE when table has been output */
  } JHUFF_TBL;
  
  /* Basic info about one component (color channel). */
  
  typedef struct
  {
  	/* These values are fixed over the whole image. */
  	/* For compression, they must be supplied by parameter setup; */
  	/* for decompression, they are read from the SOF marker. */
  	int component_id; /* identifier for this component (0..255) */
  	int component_index; /* its index in SOF or cinfo->comp_info[] */
  	int h_samp_factor; /* horizontal sampling factor (1..4) */
  	int v_samp_factor; /* vertical sampling factor (1..4) */
  	int quant_tbl_no; /* quantization table selector (0..3) */
  	/* These values may vary between scans. */
  	/* For compression, they must be supplied by parameter setup; */
  	/* for decompression, they are read from the SOS marker. */
  	/* The decompressor output side may not use these variables. */
  	int dc_tbl_no; /* DC entropy table selector (0..3) */
  	int ac_tbl_no; /* AC entropy table selector (0..3) */
  
  	/* Remaining fields should be treated as private by applications. */
  
  	/* These values are computed during compression or decompression startup: */
  	/* Component's size in DCT blocks.
  	 * Any dummy blocks added to complete an MCU are not counted; therefore
  	 * these values do not depend on whether a scan is interleaved or not.
  	 */
  	JDIMENSION width_in_blocks;
  	JDIMENSION height_in_blocks;
  	/* Size of a DCT block in samples.  Always DCTSIZE for compression.
  	 * For decompression this is the size of the output from one DCT block,
  	 * reflecting any scaling we choose to apply during the IDCT step.
  	 * Values of 1,2,4,8 are likely to be supported.  Note that different
  	 * components may receive different IDCT scalings.
  	 */
  	int DCT_scaled_size;
  	/* The downsampled dimensions are the component's actual, unpadded number
  	 * of samples at the main buffer (preprocessing/compression interface), thus
  	 * downsampled_width = ceil(image_width * Hi/Hmax)
  	 * and similarly for height.  For decompression, IDCT scaling is included,
  	 * so
  	 * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE)
  	 */
  	JDIMENSION downsampled_width; /* actual width in samples */
  	JDIMENSION downsampled_height; /* actual height in samples */
  	/* This flag is used only for decompression.  In cases where some of the
  	 * components will be ignored (eg grayscale output from YCbCr image),
  	 * we can skip most computations for the unused components.
  	 */
  	boolean component_needed; /* do we need the value of this component? */
  
  	/* These values are computed before starting a scan of the component. */
  	/* The decompressor output side may not use these variables. */
  	int MCU_width; /* number of blocks per MCU, horizontally */
  	int MCU_height; /* number of blocks per MCU, vertically */
  	int MCU_blocks; /* MCU_width * MCU_height */
  	int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */
  	int last_col_width; /* # of non-dummy blocks across in last MCU */
  	int last_row_height; /* # of non-dummy blocks down in last MCU */
  
  	/* Saved quantization table for component; nullptr if none yet saved.
  	 * See jdinput.c comments about the need for this information.
  	 * This field is currently used only for decompression.
  	 */
  	JQUANT_TBL* quant_table;
  
  	/* Private per-component storage for DCT or IDCT subsystem. */
  	void* dct_table;
  } jpeg_component_info;
  
  /* The script for encoding a multiple-scan file is an array of these: */
  
  typedef struct
  {
  	int comps_in_scan; /* number of components encoded in this scan */
  	int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */
  	int Ss, Se; /* progressive JPEG spectral selection parms */
  	int Ah, Al; /* progressive JPEG successive approx. parms */
  } jpeg_scan_info;
  
  /* The decompressor can save APPn and COM markers in a list of these: */
  
  typedef struct jpeg_marker_struct FAR* jpeg_saved_marker_ptr;
  
  struct jpeg_marker_struct
  {
  	jpeg_saved_marker_ptr next; /* next in list, or nullptr */
  	UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */
  	unsigned int original_length; /* # bytes of data in the file */
  	unsigned int data_length; /* # bytes of data saved at data[] */
  	JOCTET FAR* data; /* the data contained in the marker */
  	/* the marker length word is not counted in data_length or original_length
  	 */
  };
  
  /* Known color spaces. */
  
  typedef enum {
  	JCS_UNKNOWN, /* error/unspecified */
  	JCS_GRAYSCALE, /* monochrome */
  	JCS_RGB, /* red/green/blue */
  	JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */
  	JCS_CMYK, /* C/M/Y/K */
  	JCS_YCCK /* Y/Cb/Cr/K */
  } J_COLOR_SPACE;
  
  /* DCT/IDCT algorithm options. */
  
  typedef enum {
  	JDCT_ISLOW, /* slow but accurate integer algorithm */
  	JDCT_IFAST, /* faster, less accurate integer method */
  	JDCT_FLOAT /* floating-point: accurate, fast on fast HW */
  } J_DCT_METHOD;
  
  #ifndef JDCT_DEFAULT /* may be overridden in mrpt_jconfig.h */
  #define JDCT_DEFAULT JDCT_ISLOW
  #endif
  #ifndef JDCT_FASTEST /* may be overridden in mrpt_jconfig.h */
  #define JDCT_FASTEST JDCT_IFAST
  #endif
  
  /* Dithering options for decompression. */
  
  typedef enum {
  	JDITHER_NONE, /* no dithering */
  	JDITHER_ORDERED, /* simple ordered dither */
  	JDITHER_FS /* Floyd-Steinberg error diffusion dither */
  } J_DITHER_MODE;
  
  /* Common fields between JPEG compression and decompression master structs. */
  
  #define jpeg_common_fields                                                \
  	struct jpeg_error_mgr* err; /* Error handler module */                \
  	struct jpeg_memory_mgr* mem; /* Memory manager module */              \
  	struct jpeg_progress_mgr*                                             \
  		progress; /* Progress monitor, or nullptr if none */              \
  	void* client_data; /* Available for use by application */             \
  	boolean is_decompressor; /* So common code can tell which is which */ \
  	int global_state /* For checking call sequence validity */
  
  /* Routines that are to be used by both halves of the library are declared
   * to receive a pointer to this structure.  There are no actual instances of
   * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
   */
  struct jpeg_common_struct
  {
  	jpeg_common_fields; /* Fields common to both master struct types */
  	/* Additional fields follow in an actual jpeg_compress_struct or
  	 * jpeg_decompress_struct.  All three structs must agree on these
  	 * initial fields!  (This would be a lot cleaner in C++.)
  	 */
  };
  
  typedef struct jpeg_common_struct* j_common_ptr;
  typedef struct jpeg_compress_struct* j_compress_ptr;
  typedef struct jpeg_decompress_struct* j_decompress_ptr;
  
  /* Master record for a compression instance */
  
  struct jpeg_compress_struct
  {
  	jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */
  
  	/* Destination for compressed data */
  	struct jpeg_destination_mgr* dest;
  
  	/* Description of source image --- these fields must be filled in by
  	 * outer application before starting compression.  in_color_space must
  	 * be correct before you can even call jpeg_set_defaults().
  	 */
  
  	JDIMENSION image_width; /* input image width */
  	JDIMENSION image_height; /* input image height */
  	int input_components; /* # of color components in input image */
  	J_COLOR_SPACE in_color_space; /* colorspace of input image */
  
  	double input_gamma; /* image gamma of input image */
  
  	/* Compression parameters --- these fields must be set before calling
  	 * jpeg_start_compress().  We recommend calling jpeg_set_defaults() to
  	 * initialize everything to reasonable defaults, then changing anything
  	 * the application specifically wants to change.  That way you won't get
  	 * burnt when new parameters are added.  Also note that there are several
  	 * helper routines to simplify changing parameters.
  	 */
  
  	int data_precision; /* bits of precision in image data */
  
  	int num_components; /* # of color components in JPEG image */
  	J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
  
  	jpeg_component_info* comp_info;
  	/* comp_info[i] describes component that appears i'th in SOF */
  
  	JQUANT_TBL* quant_tbl_ptrs[NUM_QUANT_TBLS];
  	/* ptrs to coefficient quantization tables, or nullptr if not defined */
  
  	JHUFF_TBL* dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
  	JHUFF_TBL* ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
  	/* ptrs to Huffman coding tables, or nullptr if not defined */
  
  	UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
  	UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
  	UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
  
  	int num_scans; /* # of entries in scan_info array */
  	const jpeg_scan_info*
  		scan_info; /* script for multi-scan file, or nullptr */
  	/* The default value of scan_info is nullptr, which causes a single-scan
  	 * sequential JPEG file to be emitted.  To create a multi-scan file,
  	 * set num_scans and scan_info to point to an array of scan definitions.
  	 */
  
  	boolean raw_data_in; /* TRUE=caller supplies downsampled data */
  	boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
  	boolean optimize_coding; /* TRUE=optimize entropy encoding parms */
  	boolean CCIR601_sampling; /* TRUE=first samples are cosited */
  	int smoothing_factor; /* 1..100, or 0 for no input smoothing */
  	J_DCT_METHOD dct_method; /* DCT algorithm selector */
  
  	/* The restart interval can be specified in absolute MCUs by setting
  	 * restart_interval, or in MCU rows by setting restart_in_rows
  	 * (in which case the correct restart_interval will be figured
  	 * for each scan).
  	 */
  	unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
  	int restart_in_rows; /* if > 0, MCU rows per restart interval */
  
  	/* Parameters controlling emission of special markers. */
  
  	boolean write_JFIF_header; /* should a JFIF marker be written? */
  	UINT8 JFIF_major_version; /* What to write for the JFIF version number */
  	UINT8 JFIF_minor_version;
  	/* These three values are not used by the JPEG code, merely copied */
  	/* into the JFIF APP0 marker.  density_unit can be 0 for unknown, */
  	/* 1 for dots/inch, or 2 for dots/cm.  Note that the pixel aspect */
  	/* ratio is defined by X_density/Y_density even when density_unit=0. */
  	UINT8 density_unit; /* JFIF code for pixel size units */
  	UINT16 X_density; /* Horizontal pixel density */
  	UINT16 Y_density; /* Vertical pixel density */
  	boolean write_Adobe_marker; /* should an Adobe marker be written? */
  
  	/* State variable: index of next scanline to be written to
  	 * jpeg_write_scanlines().  Application may use this to control its
  	 * processing loop, e.g., "while (next_scanline < image_height)".
  	 */
  
  	JDIMENSION next_scanline; /* 0 .. image_height-1  */
  
  	/* Remaining fields are known throughout compressor, but generally
  	 * should not be touched by a surrounding application.
  	 */
  
  	/*
  	 * These fields are computed during compression startup
  	 */
  	boolean progressive_mode; /* TRUE if scan script uses progressive mode */
  	int max_h_samp_factor; /* largest h_samp_factor */
  	int max_v_samp_factor; /* largest v_samp_factor */
  
  	JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */
  	/* The coefficient controller receives data in units of MCU rows as defined
  	 * for fully interleaved scans (whether the JPEG file is interleaved or
  	 * not).
  	 * There are v_samp_factor * DCTSIZE sample rows of each component in an
  	 * "iMCU" (interleaved MCU) row.
  	 */
  
  	/*
  	 * These fields are valid during any one scan.
  	 * They describe the components and MCUs actually appearing in the scan.
  	 */
  	int comps_in_scan; /* # of JPEG components in this scan */
  	jpeg_component_info* cur_comp_info[MAX_COMPS_IN_SCAN];
  	/* *cur_comp_info[i] describes component that appears i'th in SOS */
  
  	JDIMENSION MCUs_per_row; /* # of MCUs across the image */
  	JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
  
  	int blocks_in_MCU; /* # of DCT blocks per MCU */
  	int MCU_membership[C_MAX_BLOCKS_IN_MCU];
  	/* MCU_membership[i] is index in cur_comp_info of component owning */
  	/* i'th block in an MCU */
  
  	int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
  
  	/*
  	 * Links to compression subobjects (methods and private variables of
  	 * modules)
  	 */
  	struct jpeg_comp_master* master;
  	struct jpeg_c_main_controller* main;
  	struct jpeg_c_prep_controller* prep;
  	struct jpeg_c_coef_controller* coef;
  	struct jpeg_marker_writer* marker;
  	struct jpeg_color_converter* cconvert;
  	struct jpeg_downsampler* downsample;
  	struct jpeg_forward_dct* fdct;
  	struct jpeg_entropy_encoder* entropy;
  	jpeg_scan_info* script_space; /* workspace for jpeg_simple_progression */
  	int script_space_size;
  };
  
  /* Master record for a decompression instance */
  
  struct jpeg_decompress_struct
  {
  	jpeg_common_fields; /* Fields shared with jpeg_compress_struct */
  
  	/* Source of compressed data */
  	struct jpeg_source_mgr* src;
  
  	/* Basic description of image --- filled in by jpeg_read_header(). */
  	/* Application may inspect these values to decide how to process image. */
  
  	JDIMENSION image_width; /* nominal image width (from SOF marker) */
  	JDIMENSION image_height; /* nominal image height */
  	int num_components; /* # of color components in JPEG image */
  	J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
  
  	/* Decompression processing parameters --- these fields must be set before
  	 * calling jpeg_start_decompress().  Note that jpeg_read_header()
  	 * initializes
  	 * them to default values.
  	 */
  
  	J_COLOR_SPACE out_color_space; /* colorspace for output */
  
  	unsigned int scale_num, scale_denom; /* fraction by which to scale image */
  
  	double output_gamma; /* image gamma wanted in output */
  
  	boolean buffered_image; /* TRUE=multiple output passes */
  	boolean raw_data_out; /* TRUE=downsampled data wanted */
  
  	J_DCT_METHOD dct_method; /* IDCT algorithm selector */
  	boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */
  	boolean do_block_smoothing; /* TRUE=apply interblock smoothing */
  
  	boolean quantize_colors; /* TRUE=colormapped output wanted */
  	/* the following are ignored if not quantize_colors: */
  	J_DITHER_MODE dither_mode; /* type of color dithering to use */
  	boolean two_pass_quantize; /* TRUE=use two-pass color quantization */
  	int desired_number_of_colors; /* max # colors to use in created colormap */
  	/* these are significant only in buffered-image mode: */
  	boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */
  	boolean enable_external_quant; /* enable future use of external colormap */
  	boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */
  
  	/* Description of actual output image that will be returned to application.
  	 * These fields are computed by jpeg_start_decompress().
  	 * You can also use jpeg_calc_output_dimensions() to determine these values
  	 * in advance of calling jpeg_start_decompress().
  	 */
  
  	JDIMENSION output_width; /* scaled image width */
  	JDIMENSION output_height; /* scaled image height */
  	int out_color_components; /* # of color components in out_color_space */
  	int output_components; /* # of color components returned */
  	/* output_components is 1 (a colormap index) when quantizing colors;
  	 * otherwise it equals out_color_components.
  	 */
  	int rec_outbuf_height; /* min recommended height of scanline buffer */
  	/* If the buffer passed to jpeg_read_scanlines() is less than this many rows
  	 * high, space and time will be wasted due to unnecessary data copying.
  	 * Usually rec_outbuf_height will be 1 or 2, at most 4.
  	 */
  
  	/* When quantizing colors, the output colormap is described by these fields.
  	 * The application can supply a colormap by setting colormap non-NULL before
  	 * calling jpeg_start_decompress; otherwise a colormap is created during
  	 * jpeg_start_decompress or jpeg_start_output.
  	 * The map has out_color_components rows and actual_number_of_colors
  	 * columns.
  	 */
  	int actual_number_of_colors; /* number of entries in use */
  	JSAMPARRAY colormap; /* The color map as a 2-D pixel array */
  
  	/* State variables: these variables indicate the progress of decompression.
  	 * The application may examine these but must not modify them.
  	 */
  
  	/* Row index of next scanline to be read from jpeg_read_scanlines().
  	 * Application may use this to control its processing loop, e.g.,
  	 * "while (output_scanline < output_height)".
  	 */
  	JDIMENSION output_scanline; /* 0 .. output_height-1  */
  
  	/* Current input scan number and number of iMCU rows completed in scan.
  	 * These indicate the progress of the decompressor input side.
  	 */
  	int input_scan_number; /* Number of SOS markers seen so far */
  	JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */
  
  	/* The "output scan number" is the notional scan being displayed by the
  	 * output side.  The decompressor will not allow output scan/row number
  	 * to get ahead of input scan/row, but it can fall arbitrarily far behind.
  	 */
  	int output_scan_number; /* Nominal scan number being displayed */
  	JDIMENSION output_iMCU_row; /* Number of iMCU rows read */
  
  	/* Current progression status.  coef_bits[c][i] indicates the precision
  	 * with which component c's DCT coefficient i (in zigzag order) is known.
  	 * It is -1 when no data has yet been received, otherwise it is the point
  	 * transform (shift) value for the most recent scan of the coefficient
  	 * (thus, 0 at completion of the progression).
  	 * This pointer is nullptr when reading a non-progressive file.
  	 */
  	int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */
  
  	/* Internal JPEG parameters --- the application usually need not look at
  	 * these fields.  Note that the decompressor output side may not use
  	 * any parameters that can change between scans.
  	 */
  
  	/* Quantization and Huffman tables are carried forward across input
  	 * datastreams when processing abbreviated JPEG datastreams.
  	 */
  
  	JQUANT_TBL* quant_tbl_ptrs[NUM_QUANT_TBLS];
  	/* ptrs to coefficient quantization tables, or nullptr if not defined */
  
  	JHUFF_TBL* dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
  	JHUFF_TBL* ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
  	/* ptrs to Huffman coding tables, or nullptr if not defined */
  
  	/* These parameters are never carried across datastreams, since they
  	 * are given in SOF/SOS markers or defined to be reset by SOI.
  	 */
  
  	int data_precision; /* bits of precision in image data */
  
  	jpeg_component_info* comp_info;
  	/* comp_info[i] describes component that appears i'th in SOF */
  
  	boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */
  	boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
  
  	UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
  	UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
  	UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
  
  	unsigned int
  		restart_interval; /* MCUs per restart interval, or 0 for no restart */
  
  	/* These fields record data obtained from optional markers recognized by
  	 * the JPEG library.
  	 */
  	boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */
  	/* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
  	UINT8 JFIF_major_version; /* JFIF version number */
  	UINT8 JFIF_minor_version;
  	UINT8 density_unit; /* JFIF code for pixel size units */
  	UINT16 X_density; /* Horizontal pixel density */
  	UINT16 Y_density; /* Vertical pixel density */
  	boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */
  	UINT8 Adobe_transform; /* Color transform code from Adobe marker */
  
  	boolean CCIR601_sampling; /* TRUE=first samples are cosited */
  
  	/* Aside from the specific data retained from APPn markers known to the
  	 * library, the uninterpreted contents of any or all APPn and COM markers
  	 * can be saved in a list for examination by the application.
  	 */
  	jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */
  
  	/* Remaining fields are known throughout decompressor, but generally
  	 * should not be touched by a surrounding application.
  	 */
  
  	/*
  	 * These fields are computed during decompression startup
  	 */
  	int max_h_samp_factor; /* largest h_samp_factor */
  	int max_v_samp_factor; /* largest v_samp_factor */
  
  	int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */
  
  	JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */
  	/* The coefficient controller's input and output progress is measured in
  	 * units of "iMCU" (interleaved MCU) rows.  These are the same as MCU rows
  	 * in fully interleaved JPEG scans, but are used whether the scan is
  	 * interleaved or not.  We define an iMCU row as v_samp_factor DCT block
  	 * rows of each component.  Therefore, the IDCT output contains
  	 * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row.
  	 */
  
  	JSAMPLE* sample_range_limit; /* table for fast range-limiting */
  
  	/*
  	 * These fields are valid during any one scan.
  	 * They describe the components and MCUs actually appearing in the scan.
  	 * Note that the decompressor output side must not use these fields.
  	 */
  	int comps_in_scan; /* # of JPEG components in this scan */
  	jpeg_component_info* cur_comp_info[MAX_COMPS_IN_SCAN];
  	/* *cur_comp_info[i] describes component that appears i'th in SOS */
  
  	JDIMENSION MCUs_per_row; /* # of MCUs across the image */
  	JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
  
  	int blocks_in_MCU; /* # of DCT blocks per MCU */
  	int MCU_membership[D_MAX_BLOCKS_IN_MCU];
  	/* MCU_membership[i] is index in cur_comp_info of component owning */
  	/* i'th block in an MCU */
  
  	int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
  
  	/* This field is shared between entropy decoder and marker parser.
  	 * It is either zero or the code of a JPEG marker that has been
  	 * read from the data source, but has not yet been processed.
  	 */
  	int unread_marker;
  
  	/*
  	 * Links to decompression subobjects (methods, private variables of modules)
  	 */
  	struct jpeg_decomp_master* master;
  	struct jpeg_d_main_controller* main;
  	struct jpeg_d_coef_controller* coef;
  	struct jpeg_d_post_controller* post;
  	struct jpeg_input_controller* inputctl;
  	struct jpeg_marker_reader* marker;
  	struct jpeg_entropy_decoder* entropy;
  	struct jpeg_inverse_dct* idct;
  	struct jpeg_upsampler* upsample;
  	struct jpeg_color_deconverter* cconvert;
  	struct jpeg_color_quantizer* cquantize;
  };
  
  /* "Object" declarations for JPEG modules that may be supplied or called
   * directly by the surrounding application.
   * As with all objects in the JPEG library, these structs only define the
   * publicly visible methods and state variables of a module.  Additional
   * private fields may exist after the public ones.
   */
  
  /* Error handler object */
  
  struct jpeg_error_mgr
  {
  	/* Error exit handler: does not return to caller */
  	JMETHOD(void, error_exit, (j_common_ptr cinfo));
  	/* Conditionally emit a trace or warning message */
  	JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
  	/* Routine that actually outputs a trace or error message */
  	JMETHOD(void, output_message, (j_common_ptr cinfo));
  	/* Format a message string for the most recent JPEG error or message */
  	JMETHOD(void, format_message, (j_common_ptr cinfo, char* buffer));
  #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */
  	/* Reset error state variables at start of a new image */
  	JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
  
  	/* The message ID code and any parameters are saved here.
  	 * A message can have one string parameter or up to 8 int parameters.
  	 */
  	int msg_code;
  #define JMSG_STR_PARM_MAX 80
  	union {
  		int i[8];
  		char s[JMSG_STR_PARM_MAX];
  	} msg_parm;
  
  	/* Standard state variables for error facility */
  
  	int trace_level; /* max msg_level that will be displayed */
  
  	/* For recoverable corrupt-data errors, we emit a warning message,
  	 * but keep going unless emit_message chooses to abort.  emit_message
  	 * should count warnings in num_warnings.  The surrounding application
  	 * can check for bad data by seeing if num_warnings is nonzero at the
  	 * end of processing.
  	 */
  	long num_warnings; /* number of corrupt-data warnings */
  
  	/* These fields point to the table(s) of error message strings.
  	 * An application can change the table pointer to switch to a different
  	 * message list (typically, to change the language in which errors are
  	 * reported).  Some applications may wish to add additional error codes
  	 * that will be handled by the JPEG library error mechanism; the second
  	 * table pointer is used for this purpose.
  	 *
  	 * First table includes all errors generated by JPEG library itself.
  	 * Error code 0 is reserved for a "no such error string" message.
  	 */
  	const char* const* jpeg_message_table; /* Library errors */
  	int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */
  	/* Second table can be added by application (see cjpeg/djpeg for example).
  	 * It contains strings numbered first_addon_message..last_addon_message.
  	 */
  	const char* const* addon_message_table; /* Non-library errors */
  	int first_addon_message; /* code for first string in addon table */
  	int last_addon_message; /* code for last string in addon table */
  };
  
  /* Progress monitor object */
  
  struct jpeg_progress_mgr
  {
  	JMETHOD(void, progress_monitor, (j_common_ptr cinfo));
  
  	long pass_counter; /* work units completed in this pass */
  	long pass_limit; /* total number of work units in this pass */
  	int completed_passes; /* passes completed so far */
  	int total_passes; /* total number of passes expected */
  };
  
  /* Data destination object for compression */
  
  struct jpeg_destination_mgr
  {
  	JOCTET* next_output_byte; /* => next byte to write in buffer */
  	size_t free_in_buffer; /* # of byte spaces remaining in buffer */
  
  	JMETHOD(void, init_destination, (j_compress_ptr cinfo));
  	JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo));
  	JMETHOD(void, term_destination, (j_compress_ptr cinfo));
  };
  
  /* Data source object for decompression */
  
  struct jpeg_source_mgr
  {
  	const JOCTET* next_input_byte; /* => next byte to read from buffer */
  	size_t bytes_in_buffer; /* # of bytes remaining in buffer */
  
  	JMETHOD(void, init_source, (j_decompress_ptr cinfo));
  	JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo));
  	JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes));
  	JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
  	JMETHOD(void, term_source, (j_decompress_ptr cinfo));
  };
  
  /* Memory manager object.
   * Allocates "small" objects (a few K total), "large" objects (tens of K),
   * and "really big" objects (virtual arrays with backing store if needed).
   * The memory manager does not allow individual objects to be freed; rather,
   * each created object is assigned to a pool, and whole pools can be freed
   * at once.  This is faster and more convenient than remembering exactly what
   * to free, especially where malloc()/free() are not too speedy.
   * NB: alloc routines never return NULL.  They exit to error_exit if not
   * successful.
   */
  
  #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */
  #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */
  #define JPOOL_NUMPOOLS 2
  
  typedef struct jvirt_sarray_control* jvirt_sarray_ptr;
  typedef struct jvirt_barray_control* jvirt_barray_ptr;
  
  struct jpeg_memory_mgr
  {
  	/* Method pointers */
  	JMETHOD(
  		void*, alloc_small,
  		(j_common_ptr cinfo, int pool_id, size_t sizeofobject));
  	JMETHOD(
  		void FAR*, alloc_large,
  		(j_common_ptr cinfo, int pool_id, size_t sizeofobject));
  	JMETHOD(
  		JSAMPARRAY, alloc_sarray,
  		(j_common_ptr cinfo, int pool_id, JDIMENSION samplesperrow,
  		 JDIMENSION numrows));
  	JMETHOD(
  		JBLOCKARRAY, alloc_barray,
  		(j_common_ptr cinfo, int pool_id, JDIMENSION blocksperrow,
  		 JDIMENSION numrows));
  	JMETHOD(
  		jvirt_sarray_ptr, request_virt_sarray,
  		(j_common_ptr cinfo, int pool_id, boolean pre_zero,
  		 JDIMENSION samplesperrow, JDIMENSION numrows, JDIMENSION maxaccess));
  	JMETHOD(
  		jvirt_barray_ptr, request_virt_barray,
  		(j_common_ptr cinfo, int pool_id, boolean pre_zero,
  		 JDIMENSION blocksperrow, JDIMENSION numrows, JDIMENSION maxaccess));
  	JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo));
  	JMETHOD(
  		JSAMPARRAY, access_virt_sarray,
  		(j_common_ptr cinfo, jvirt_sarray_ptr ptr, JDIMENSION start_row,
  		 JDIMENSION num_rows, boolean writable));
  	JMETHOD(
  		JBLOCKARRAY, access_virt_barray,
  		(j_common_ptr cinfo, jvirt_barray_ptr ptr, JDIMENSION start_row,
  		 JDIMENSION num_rows, boolean writable));
  	JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id));
  	JMETHOD(void, self_destruct, (j_common_ptr cinfo));
  
  	/* Limit on memory allocation for this JPEG object.  (Note that this is
  	 * merely advisory, not a guaranteed maximum; it only affects the space
  	 * used for virtual-array buffers.)  May be changed by outer application
  	 * after creating the JPEG object.
  	 */
  	long max_memory_to_use;
  
  	/* Maximum allocation request accepted by alloc_large. */
  	long max_alloc_chunk;
  };
  
  /* Routine signature for application-supplied marker processing methods.
   * Need not pass marker code since it is stored in cinfo->unread_marker.
   */
  typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
  
  /* Declarations for routines called by application.
   * The JPP macro hides prototype parameters from compilers that can't cope.
   * Note JPP requires double parentheses.
   */
  
  #ifdef HAVE_PROTOTYPES
  #define JPP(arglist) arglist
  #else
  #define JPP(arglist) ()
  #endif
  
  /* Short forms of external names for systems with brain-damaged linkers.
   * We shorten external names to be unique in the first six letters, which
   * is good enough for all known systems.
   * (If your compiler itself needs names to be unique in less than 15
   * characters, you are out of luck.  Get a better compiler.)
   */
  
  #ifdef NEED_SHORT_EXTERNAL_NAMES
  #define jpeg_std_error jStdError
  #define jpeg_CreateCompress jCreaCompress
  #define jpeg_CreateDecompress jCreaDecompress
  #define jpeg_destroy_compress jDestCompress
  #define jpeg_destroy_decompress jDestDecompress
  #define jpeg_stdio_dest jStdDest
  #define jpeg_stdio_src jStdSrc
  #define jpeg_set_defaults jSetDefaults
  #define jpeg_set_colorspace jSetColorspace
  #define jpeg_default_colorspace jDefColorspace
  #define jpeg_set_quality jSetQuality
  #define jpeg_set_linear_quality jSetLQuality
  #define jpeg_add_quant_table jAddQuantTable
  #define jpeg_quality_scaling jQualityScaling
  #define jpeg_simple_progression jSimProgress
  #define jpeg_suppress_tables jSuppressTables
  #define jpeg_alloc_quant_table jAlcQTable
  #define jpeg_alloc_huff_table jAlcHTable
  #define jpeg_start_compress jStrtCompress
  #define jpeg_write_scanlines jWrtScanlines
  #define jpeg_finish_compress jFinCompress
  #define jpeg_write_raw_data jWrtRawData
  #define jpeg_write_marker jWrtMarker
  #define jpeg_write_m_header jWrtMHeader
  #define jpeg_write_m_byte jWrtMByte
  #define jpeg_write_tables jWrtTables
  #define jpeg_read_header jReadHeader
  #define jpeg_start_decompress jStrtDecompress
  #define jpeg_read_scanlines jReadScanlines
  #define jpeg_finish_decompress jFinDecompress
  #define jpeg_read_raw_data jReadRawData
  #define jpeg_has_multiple_scans jHasMultScn
  #define jpeg_start_output jStrtOutput
  #define jpeg_finish_output jFinOutput
  #define jpeg_input_complete jInComplete
  #define jpeg_new_colormap jNewCMap
  #define jpeg_consume_input jConsumeInput
  #define jpeg_calc_output_dimensions jCalcDimensions
  #define jpeg_save_markers jSaveMarkers
  #define jpeg_set_marker_processor jSetMarker
  #define jpeg_read_coefficients jReadCoefs
  #define jpeg_write_coefficients jWrtCoefs
  #define jpeg_copy_critical_parameters jCopyCrit
  #define jpeg_abort_compress jAbrtCompress
  #define jpeg_abort_decompress jAbrtDecompress
  #define jpeg_abort jAbort
  #define jpeg_destroy jDestroy
  #define jpeg_resync_to_restart jResyncRestart
  #endif /* NEED_SHORT_EXTERNAL_NAMES */
  
  /* Default error-management setup */
  EXTERN(struct jpeg_error_mgr*)
  jpeg_std_error JPP((struct jpeg_error_mgr * err));
  
  /* Initialization of JPEG compression objects.
   * jpeg_create_compress() and jpeg_create_decompress() are the exported
   * names that applications should call.  These expand to calls on
   * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
   * passed for version mismatch checking.
   * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
   */
  #define jpeg_create_compress(cinfo) \
  	jpeg_CreateCompress(            \
  		(cinfo), JPEG_LIB_VERSION,  \
  		(size_t)sizeof(struct jpeg_compress_struct))
  #define jpeg_create_decompress(cinfo) \
  	jpeg_CreateDecompress(            \
  		(cinfo), JPEG_LIB_VERSION,    \
  		(size_t)sizeof(struct jpeg_decompress_struct))
  EXTERN(void)
  jpeg_CreateCompress JPP((j_compress_ptr cinfo, int version, size_t structsize));
  EXTERN(void)
  jpeg_CreateDecompress JPP(
  	(j_decompress_ptr cinfo, int version, size_t structsize));
  /* Destruction of JPEG compression objects */
  EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo));
  EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
  
  /* Standard data source and destination managers: stdio streams. */
  /* Caller is responsible for opening the file before and closing after. */
  EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE* outfile));
  EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE* infile));
  
  /* Default parameter setup for compression */
  EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo));
  /* Compression parameter setup aids */
  EXTERN(void)
  jpeg_set_colorspace JPP((j_compress_ptr cinfo, J_COLOR_SPACE colorspace));
  EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo));
  EXTERN(void)
  jpeg_set_quality JPP(
  	(j_compress_ptr cinfo, int quality, boolean force_baseline));
  EXTERN(void)
  jpeg_set_linear_quality JPP(
  	(j_compress_ptr cinfo, int scale_factor, boolean force_baseline));
  EXTERN(void)
  jpeg_add_quant_table JPP(
  	(j_compress_ptr cinfo, int which_tbl, const unsigned int* basic_table,
  	 int scale_factor, boolean force_baseline));
  EXTERN(int) jpeg_quality_scaling JPP((int quality));
  EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo));
  EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo, boolean suppress));
  EXTERN(JQUANT_TBL*) jpeg_alloc_quant_table JPP((j_common_ptr cinfo));
  EXTERN(JHUFF_TBL*) jpeg_alloc_huff_table JPP((j_common_ptr cinfo));
  
  /* Main entry points for compression */
  EXTERN(void)
  jpeg_start_compress JPP((j_compress_ptr cinfo, boolean write_all_tables));
  EXTERN(JDIMENSION)
  jpeg_write_scanlines JPP(
  	(j_compress_ptr cinfo, JSAMPARRAY scanlines, JDIMENSION num_lines));
  EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo));
  
  /* Replaces jpeg_write_scanlines when writing raw downsampled data. */
  EXTERN(JDIMENSION)
  jpeg_write_raw_data JPP(
  	(j_compress_ptr cinfo, JSAMPIMAGE data, JDIMENSION num_lines));
  
  /* Write a special marker.  See libjpeg.doc concerning safe usage. */
  EXTERN(void)
  jpeg_write_marker JPP(
  	(j_compress_ptr cinfo, int marker, const JOCTET* dataptr,
  	 unsigned int datalen));
  /* Same, but piecemeal. */
  EXTERN(void)
  jpeg_write_m_header JPP(
  	(j_compress_ptr cinfo, int marker, unsigned int datalen));
  EXTERN(void) jpeg_write_m_byte JPP((j_compress_ptr cinfo, int val));
  
  /* Alternate compression function: just write an abbreviated table file */
  EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo));
  
  /* Decompression startup: read start of JPEG datastream to see what's there */
  EXTERN(int)
  jpeg_read_header JPP((j_decompress_ptr cinfo, boolean require_image));
  /* Return value is one of: */
  #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */
  #define JPEG_HEADER_OK 1 /* Found valid image datastream */
  #define JPEG_HEADER_TABLES_ONLY                  \
  	2 /* Found valid table-specs-only datastream \
  		 */
  /* If you pass require_image = TRUE (normal case), you need not check for
   * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
   * JPEG_SUSPENDED is only possible if you use a data source module that can
   * give a suspension return (the stdio source module doesn't).
   */
  
  /* Main entry points for decompression */
  EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo));
  EXTERN(JDIMENSION)
  jpeg_read_scanlines JPP(
  	(j_decompress_ptr cinfo, JSAMPARRAY scanlines, JDIMENSION max_lines));
  EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo));
  
  /* Replaces jpeg_read_scanlines when reading raw downsampled data. */
  EXTERN(JDIMENSION)
  jpeg_read_raw_data JPP(
  	(j_decompress_ptr cinfo, JSAMPIMAGE data, JDIMENSION max_lines));
  
  /* Additional entry points for buffered-image mode. */
  EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
  EXTERN(boolean)
  jpeg_start_output JPP((j_decompress_ptr cinfo, int scan_number));
  EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo));
  EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo));
  EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo));
  EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo));
  /* Return value is one of: */
  /* #define JPEG_SUSPENDED	0    Suspended due to lack of input data */
  #define JPEG_REACHED_SOS 1 /* Reached start of new scan */
  #define JPEG_REACHED_EOI 2 /* Reached end of image */
  #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */
  #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */
  
  /* Precalculate output dimensions for current decompression parameters. */
  EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
  
  /* Control saving of COM and APPn markers into marker_list. */
  EXTERN(void)
  jpeg_save_markers JPP(
  	(j_decompress_ptr cinfo, int marker_code, unsigned int length_limit));
  
  /* Install a special processing method for COM or APPn markers. */
  EXTERN(void)
  jpeg_set_marker_processor JPP(
  	(j_decompress_ptr cinfo, int marker_code,
  	 jpeg_marker_parser_method routine));
  
  /* Read or write raw DCT coefficients --- useful for lossless transcoding. */
  EXTERN(jvirt_barray_ptr*) jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
  EXTERN(void)
  jpeg_write_coefficients JPP(
  	(j_compress_ptr cinfo, jvirt_barray_ptr* coef_arrays));
  EXTERN(void)
  jpeg_copy_critical_parameters JPP(
  	(j_decompress_ptr srcinfo, j_compress_ptr dstinfo));
  
  /* If you choose to abort compression or decompression before completing
   * jpeg_finish_(de)compress, then you need to clean up to release memory,
   * temporary files, etc.  You can just call jpeg_destroy_(de)compress
   * if you're done with the JPEG object, but if you want to clean it up and
   * reuse it, call this:
   */
  EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo));
  EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo));
  
  /* Generic versions of jpeg_abort and jpeg_destroy that work on either
   * flavor of JPEG object.  These may be more convenient in some places.
   */
  EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo));
  EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo));
  
  /* Default restart-marker-resync procedure for use by data source modules */
  EXTERN(boolean)
  jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, int desired));
  
  /* These marker codes are exported since applications and data source modules
   * are likely to want to use them.
   */
  
  #define JPEG_RST0 0xD0 /* RST0 marker code */
  #define JPEG_EOI 0xD9 /* EOI marker code */
  #define JPEG_APP0 0xE0 /* APP0 marker code */
  #define JPEG_COM 0xFE /* COM marker code */
  
  /* If we have a brain-damaged compiler that emits warnings (or worse, errors)
   * for structure definitions that are never filled in, keep it quiet by
   * supplying dummy definitions for the various substructures.
   */
  
  #ifdef INCOMPLETE_TYPES_BROKEN
  #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */
  struct jvirt_sarray_control
  {
  	long dummy;
  };
  struct jvirt_barray_control
  {
  	long dummy;
  };
  struct jpeg_comp_master
  {
  	long dummy;
  };
  struct jpeg_c_main_controller
  {
  	long dummy;
  };
  struct jpeg_c_prep_controller
  {
  	long dummy;
  };
  struct jpeg_c_coef_controller
  {
  	long dummy;
  };
  struct jpeg_marker_writer
  {
  	long dummy;
  };
  struct jpeg_color_converter
  {
  	long dummy;
  };
  struct jpeg_downsampler
  {
  	long dummy;
  };
  struct jpeg_forward_dct
  {
  	long dummy;
  };
  struct jpeg_entropy_encoder
  {
  	long dummy;
  };
  struct jpeg_decomp_master
  {
  	long dummy;
  };
  struct jpeg_d_main_controller
  {
  	long dummy;
  };
  struct jpeg_d_coef_controller
  {
  	long dummy;
  };
  struct jpeg_d_post_controller
  {
  	long dummy;
  };
  struct jpeg_input_controller
  {
  	long dummy;
  };
  struct jpeg_marker_reader
  {
  	long dummy;
  };
  struct jpeg_entropy_decoder
  {
  	long dummy;
  };
  struct jpeg_inverse_dct
  {
  	long dummy;
  };
  struct jpeg_upsampler
  {
  	long dummy;
  };
  struct jpeg_color_deconverter
  {
  	long dummy;
  };
  struct jpeg_color_quantizer
  {
  	long dummy;
  };
  #endif /* JPEG_INTERNALS */
  #endif /* INCOMPLETE_TYPES_BROKEN */
  
  /*
   * The JPEG library modules define JPEG_INTERNALS before including this file.
   * The internal structure declarations are read only when that is true.
   * Applications using the library should not include jpegint.h, but may wish
   * to include jerror.h.
   */
  
  #ifdef JPEG_INTERNALS
  #include "jpegint.h" /* fetch private declarations */
  #include "jerror.h" /* fetch error codes too */
  #endif
  
  #endif /* JPEGLIB_H */
  