dcmjpeg/libijg16/jpeglib16.h

00001 /*
00002  * jpeglib.h
00003  *
00004  * Copyright (C) 1991-1998, Thomas G. Lane.
00005  * This file is part of the Independent JPEG Group's software.
00006  * For conditions of distribution and use, see the accompanying README file.
00007  *
00008  * This file defines the application interface for the JPEG library.
00009  * Most applications using the library need only include this file,
00010  * and perhaps jerror.h if they want to know the exact error codes.
00011  */
00012 
00013 #ifndef JPEGLIB_H
00014 #define JPEGLIB_H
00015 
00016 /*
00017  * First we include the configuration files that record how this
00018  * installation of the JPEG library is set up.  jconfig.h can be
00019  * generated automatically for many systems.  jmorecfg.h contains
00020  * manual configuration options that most people need not worry about.
00021  */
00022 
00023 #ifndef JCONFIG_INCLUDED    /* in case jinclude.h already did */
00024 #include "jconfig16.h"      /* widely used configuration options */
00025 #endif
00026 #include "jmorecfg16.h"     /* seldom changed options */
00027 
00028 
00029 /* Version ID for the JPEG library.
00030  * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60".
00031  */
00032 
00033 #define JPEG_LIB_VERSION  62    /* Version 6b */
00034 
00035 
00036 /* Various constants determining the sizes of things.
00037  * All of these are specified by the JPEG standard, so don't change them
00038  * if you want to be compatible.
00039  */
00040 
00041 #define DCTSIZE         8   /* The basic DCT block is 8x8 samples */
00042 #define DCTSIZE2        64  /* DCTSIZE squared; # of elements in a block */
00043 #define NUM_QUANT_TBLS      4   /* Quantization tables are numbered 0..3 */
00044 #define NUM_HUFF_TBLS       4   /* Huffman tables are numbered 0..3 */
00045 #define NUM_ARITH_TBLS      16  /* Arith-coding tables are numbered 0..15 */
00046 #define MAX_COMPS_IN_SCAN   4   /* JPEG limit on # of components in one scan */
00047 #define MAX_SAMP_FACTOR     4   /* JPEG limit on sampling factors */
00048 /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
00049  * the PostScript DCT filter can emit files with many more than 10 data units
00050  * per MCU.
00051  * If you happen to run across such a file, you can up D_MAX_DATA_UNITS_IN_MCU
00052  * to handle it.  We even let you do this from the jconfig.h file.  However,
00053  * we strongly discourage changing C_MAX_DATA_UNITS_IN_MCU; just because Adobe
00054  * sometimes emits noncompliant files doesn't mean you should too.
00055  */
00056 #define C_MAX_DATA_UNITS_IN_MCU   10 /* compressor's limit on data units/MCU */
00057 #ifndef D_MAX_DATA_UNITS_IN_MCU
00058 #define D_MAX_DATA_UNITS_IN_MCU   10 /* decompressor's limit on data units/MCU */
00059 #endif
00060 
00061 
00062 /* Data structures for images (arrays of samples and of DCT coefficients).
00063  * On 80x86 machines, the image arrays are too big for near pointers,
00064  * but the pointer arrays can fit in near memory.
00065  */
00066 
00067 typedef JSAMPLE FAR *JSAMPROW;  /* ptr to one image row of pixel samples. */
00068 typedef JSAMPROW *JSAMPARRAY;   /* ptr to some rows (a 2-D sample array) */
00069 typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */
00070 
00071 typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */
00072 typedef JBLOCK FAR *JBLOCKROW;  /* pointer to one row of coefficient blocks */
00073 typedef JBLOCKROW *JBLOCKARRAY;     /* a 2-D array of coefficient blocks */
00074 typedef JBLOCKARRAY *JBLOCKIMAGE;   /* a 3-D array of coefficient blocks */
00075 
00076 typedef JCOEF FAR *JCOEFPTR;    /* useful in a couple of places */
00077 
00078 typedef JDIFF FAR *JDIFFROW;    /* pointer to one row of difference values */
00079 typedef JDIFFROW *JDIFFARRAY;   /* ptr to some rows (a 2-D diff array) */
00080 typedef JDIFFARRAY *JDIFFIMAGE; /* a 3-D diff array: top index is color */
00081 
00082 
00083 /* Types for JPEG compression parameters and working tables. */
00084 
00085 
00086 /* DCT coefficient quantization tables. */
00087 
00088 typedef struct {
00089   /* This array gives the coefficient quantizers in natural array order
00090    * (not the zigzag order in which they are stored in a JPEG DQT marker).
00091    * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
00092    */
00093   UINT16 quantval[DCTSIZE2];    /* quantization step for each coefficient */
00094   /* This field is used only during compression.  It's initialized FALSE when
00095    * the table is created, and set TRUE when it's been output to the file.
00096    * You could suppress output of a table by setting this to TRUE.
00097    * (See jpeg_suppress_tables for an example.)
00098    */
00099   boolean sent_table;       /* TRUE when table has been output */
00100 } JQUANT_TBL;
00101 
00102 
00103 /* Huffman coding tables. */
00104 
00105 typedef struct {
00106   /* These two fields directly represent the contents of a JPEG DHT marker */
00107   UINT8 bits[17];       /* bits[k] = # of symbols with codes of */
00108                 /* length k bits; bits[0] is unused */
00109   UINT8 huffval[256];       /* The symbols, in order of incr code length */
00110   /* This field is used only during compression.  It's initialized FALSE when
00111    * the table is created, and set TRUE when it's been output to the file.
00112    * You could suppress output of a table by setting this to TRUE.
00113    * (See jpeg_suppress_tables for an example.)
00114    */
00115   boolean sent_table;       /* TRUE when table has been output */
00116 } JHUFF_TBL;
00117 
00118 
00119 /* Basic info about one component (color channel). */
00120 
00121 typedef struct {
00122   /* These values are fixed over the whole image. */
00123   /* For compression, they must be supplied by parameter setup; */
00124   /* for decompression, they are read from the SOF marker. */
00125   int component_id;     /* identifier for this component (0..255) */
00126   int component_index;      /* its index in SOF or cinfo->comp_info[] */
00127   int h_samp_factor;        /* horizontal sampling factor (1..4) */
00128   int v_samp_factor;        /* vertical sampling factor (1..4) */
00129   int quant_tbl_no;     /* quantization table selector (0..3) */
00130   /* These values may vary between scans. */
00131   /* For compression, they must be supplied by parameter setup; */
00132   /* for decompression, they are read from the SOS marker. */
00133   /* The decompressor output side may not use these variables. */
00134   int dc_tbl_no;        /* DC entropy table selector (0..3) */
00135   int ac_tbl_no;        /* AC entropy table selector (0..3) */
00136   
00137   /* Remaining fields should be treated as private by applications. */
00138   
00139   /* These values are computed during compression or decompression startup: */
00140   /* Component's size in data units.
00141    * Any dummy data units added to complete an MCU are not counted; therefore
00142    * these values do not depend on whether a scan is interleaved or not.
00143    */
00144   JDIMENSION width_in_data_units;
00145   JDIMENSION height_in_data_units;
00146   /* Size of a data unit in/output by the codec (in samples).  Always
00147    * data_unit for compression.  For decompression this is the size of the
00148    * output from one data_unit, reflecting any processing performed by the
00149    * codec.  For example, in the DCT-based codec, scaling may be applied
00150    * during the IDCT step.  Values of 1,2,4,8 are likely to be supported.
00151    * Note that different components may have different codec_data_unit sizes.
00152    */
00153   int codec_data_unit;
00154   /* The downsampled dimensions are the component's actual, unpadded number
00155    * of samples at the main buffer (preprocessing/compression interface), thus
00156    * downsampled_width = ceil(image_width * Hi/Hmax)
00157    * and similarly for height.  For decompression, codec-based processing is
00158    * included (ie, IDCT scaling), so
00159    * downsampled_width = ceil(image_width * Hi/Hmax * codec_data_unit/data_unit)
00160    */
00161   JDIMENSION downsampled_width;  /* actual width in samples */
00162   JDIMENSION downsampled_height; /* actual height in samples */
00163   /* This flag is used only for decompression.  In cases where some of the
00164    * components will be ignored (eg grayscale output from YCbCr image),
00165    * we can skip most computations for the unused components.
00166    */
00167   boolean component_needed; /* do we need the value of this component? */
00168 
00169   /* These values are computed before starting a scan of the component. */
00170   /* The decompressor output side may not use these variables. */
00171   int MCU_width;        /* number of data units per MCU, horizontally */
00172   int MCU_height;       /* number of data units per MCU, vertically */
00173   int MCU_data_units;       /* MCU_width * MCU_height */
00174   int MCU_sample_width;     /* MCU width in samples, MCU_width*codec_data_unit */
00175   int last_col_width;       /* # of non-dummy data_units across in last MCU */
00176   int last_row_height;      /* # of non-dummy data_units down in last MCU */
00177 
00178   /* Saved quantization table for component; NULL if none yet saved.
00179    * See jdinput.c comments about the need for this information.
00180    * This field is currently used only for decompression.
00181    */
00182   JQUANT_TBL * quant_table;
00183 
00184   /* Private per-component storage for DCT or IDCT subsystem. */
00185   void * dct_table;
00186 } jpeg_component_info;
00187 
00188 
00189 /* The script for encoding a multiple-scan file is an array of these: */
00190 
00191 typedef struct {
00192   int comps_in_scan;        /* number of components encoded in this scan */
00193   int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */
00194   int Ss, Se;           /* progressive JPEG spectral selection parms
00195                    lossless JPEG predictor select parm (Ss) */
00196   int Ah, Al;           /* progressive JPEG successive approx. parms
00197                    lossless JPEG point transform parm (Al) */
00198 } jpeg_scan_info;
00199 
00200 /* The decompressor can save APPn and COM markers in a list of these: */
00201 
00202 typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr;
00203 
00204 struct jpeg_marker_struct {
00205   jpeg_saved_marker_ptr next;   /* next in list, or NULL */
00206   UINT8 marker;         /* marker code: JPEG_COM, or JPEG_APP0+n */
00207   unsigned int original_length; /* # bytes of data in the file */
00208   unsigned int data_length; /* # bytes of data saved at data[] */
00209   JOCTET FAR * data;        /* the data contained in the marker */
00210   /* the marker length word is not counted in data_length or original_length */
00211 };
00212 
00213 /* Known codec processes. */
00214 
00215 typedef enum {
00216     JPROC_SEQUENTIAL,   /* baseline/extended sequential DCT */
00217     JPROC_PROGRESSIVE,  /* progressive DCT */
00218     JPROC_LOSSLESS      /* lossless (sequential) */
00219 } J_CODEC_PROCESS;
00220 
00221 /* Known color spaces. */
00222 
00223 typedef enum {
00224     JCS_UNKNOWN,        /* error/unspecified */
00225     JCS_GRAYSCALE,      /* monochrome */
00226     JCS_RGB,        /* red/green/blue */
00227     JCS_YCbCr,      /* Y/Cb/Cr (also known as YUV) */
00228     JCS_CMYK,       /* C/M/Y/K */
00229     JCS_YCCK        /* Y/Cb/Cr/K */
00230 } J_COLOR_SPACE;
00231 
00232 /* DCT/IDCT algorithm options. */
00233 
00234 typedef enum {
00235     JDCT_ISLOW,     /* slow but accurate integer algorithm */
00236     JDCT_IFAST,     /* faster, less accurate integer method */
00237     JDCT_FLOAT      /* floating-point: accurate, fast on fast HW */
00238 } J_DCT_METHOD;
00239 
00240 #ifndef JDCT_DEFAULT        /* may be overridden in jconfig.h */
00241 #define JDCT_DEFAULT  JDCT_ISLOW
00242 #endif
00243 #ifndef JDCT_FASTEST        /* may be overridden in jconfig.h */
00244 #define JDCT_FASTEST  JDCT_IFAST
00245 #endif
00246 
00247 /* Dithering options for decompression. */
00248 
00249 typedef enum {
00250     JDITHER_NONE,       /* no dithering */
00251     JDITHER_ORDERED,    /* simple ordered dither */
00252     JDITHER_FS      /* Floyd-Steinberg error diffusion dither */
00253 } J_DITHER_MODE;
00254 
00255 
00256 /* Common fields between JPEG compression and decompression master structs. */
00257 
00258 #define jpeg_common_fields \
00259   struct jpeg_error_mgr * err;  /* Error handler module */\
00260   struct jpeg_memory_mgr * mem; /* Memory manager module */\
00261   struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
00262   void * client_data;       /* Available for use by application */\
00263   boolean is_decompressor;  /* So common code can tell which is which */\
00264   int global_state      /* For checking call sequence validity */
00265 
00266 /* Routines that are to be used by both halves of the library are declared
00267  * to receive a pointer to this structure.  There are no actual instances of
00268  * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
00269  */
00270 struct jpeg_common_struct {
00271   jpeg_common_fields;       /* Fields common to both master struct types */
00272   /* Additional fields follow in an actual jpeg_compress_struct or
00273    * jpeg_decompress_struct.  All three structs must agree on these
00274    * initial fields!  (This would be a lot cleaner in C++.)
00275    */
00276 };
00277 
00278 typedef struct jpeg_common_struct * j_common_ptr;
00279 typedef struct jpeg_compress_struct * j_compress_ptr;
00280 typedef struct jpeg_decompress_struct * j_decompress_ptr;
00281 
00282 
00283 /* Master record for a compression instance */
00284 
00285 struct jpeg_compress_struct {
00286   jpeg_common_fields;       /* Fields shared with jpeg_decompress_struct */
00287 
00288   /* Destination for compressed data */
00289   struct jpeg_destination_mgr * dest;
00290 
00291   /* Description of source image --- these fields must be filled in by
00292    * outer application before starting compression.  in_color_space must
00293    * be correct before you can even call jpeg_set_defaults().
00294    */
00295 
00296   JDIMENSION image_width;   /* input image width */
00297   JDIMENSION image_height;  /* input image height */
00298   int input_components;     /* # of color components in input image */
00299   J_COLOR_SPACE in_color_space; /* colorspace of input image */
00300 
00301   double input_gamma;       /* image gamma of input image */
00302 
00303   /* Compression parameters --- these fields must be set before calling
00304    * jpeg_start_compress().  We recommend calling jpeg_set_defaults() to
00305    * initialize everything to reasonable defaults, then changing anything
00306    * the application specifically wants to change.  That way you won't get
00307    * burnt when new parameters are added.  Also note that there are several
00308    * helper routines to simplify changing parameters.
00309    */
00310 
00311   boolean lossless;     /* TRUE=lossless encoding, FALSE=lossy */
00312 
00313   int data_precision;       /* bits of precision in image data */
00314 
00315   int num_components;       /* # of color components in JPEG image */
00316   J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
00317 
00318   jpeg_component_info * comp_info;
00319   /* comp_info[i] describes component that appears i'th in SOF */
00320   
00321   JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
00322   /* ptrs to coefficient quantization tables, or NULL if not defined */
00323   
00324   JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
00325   JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
00326   /* ptrs to Huffman coding tables, or NULL if not defined */
00327   
00328   UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
00329   UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
00330   UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
00331 
00332   int num_scans;        /* # of entries in scan_info array */
00333   const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */
00334   /* The default value of scan_info is NULL, which causes a single-scan
00335    * sequential JPEG file to be emitted.  To create a multi-scan file,
00336    * set num_scans and scan_info to point to an array of scan definitions.
00337    */
00338 
00339   boolean raw_data_in;      /* TRUE=caller supplies downsampled data */
00340   boolean arith_code;       /* TRUE=arithmetic coding, FALSE=Huffman */
00341   boolean optimize_coding;  /* TRUE=optimize entropy encoding parms */
00342   boolean CCIR601_sampling; /* TRUE=first samples are cosited */
00343   int smoothing_factor;     /* 1..100, or 0 for no input smoothing */
00344   J_DCT_METHOD dct_method;  /* DCT algorithm selector */
00345 
00346   /* The restart interval can be specified in absolute MCUs by setting
00347    * restart_interval, or in MCU rows by setting restart_in_rows
00348    * (in which case the correct restart_interval will be figured
00349    * for each scan).
00350    */
00351   unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
00352   int restart_in_rows;      /* if > 0, MCU rows per restart interval */
00353 
00354   /* Parameters controlling emission of special markers. */
00355 
00356   boolean write_JFIF_header;    /* should a JFIF marker be written? */
00357   UINT8 JFIF_major_version; /* What to write for the JFIF version number */
00358   UINT8 JFIF_minor_version;
00359   /* These three values are not used by the JPEG code, merely copied */
00360   /* into the JFIF APP0 marker.  density_unit can be 0 for unknown, */
00361   /* 1 for dots/inch, or 2 for dots/cm.  Note that the pixel aspect */
00362   /* ratio is defined by X_density/Y_density even when density_unit=0. */
00363   UINT8 density_unit;       /* JFIF code for pixel size units */
00364   UINT16 X_density;     /* Horizontal pixel density */
00365   UINT16 Y_density;     /* Vertical pixel density */
00366   boolean write_Adobe_marker;   /* should an Adobe marker be written? */
00367   
00368   /* State variable: index of next scanline to be written to
00369    * jpeg_write_scanlines().  Application may use this to control its
00370    * processing loop, e.g., "while (next_scanline < image_height)".
00371    */
00372 
00373   JDIMENSION next_scanline; /* 0 .. image_height-1  */
00374 
00375   /* Remaining fields are known throughout compressor, but generally
00376    * should not be touched by a surrounding application.
00377    */
00378 
00379   /*
00380    * These fields are computed during compression startup
00381    */
00382   int data_unit;        /* size of data unit in samples */
00383   J_CODEC_PROCESS process;  /* encoding process of JPEG image */
00384 
00385   int max_h_samp_factor;    /* largest h_samp_factor */
00386   int max_v_samp_factor;    /* largest v_samp_factor */
00387 
00388   JDIMENSION total_iMCU_rows;   /* # of iMCU rows to be input to codec */
00389   /* The codec receives data in units of MCU rows as defined for fully
00390    * interleaved scans (whether the JPEG file is interleaved or not).
00391    * There are v_samp_factor * data_unit sample rows of each component in an
00392    * "iMCU" (interleaved MCU) row.
00393    */
00394   
00395   /*
00396    * These fields are valid during any one scan.
00397    * They describe the components and MCUs actually appearing in the scan.
00398    */
00399   int comps_in_scan;        /* # of JPEG components in this scan */
00400   jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
00401   /* *cur_comp_info[i] describes component that appears i'th in SOS */
00402   
00403   JDIMENSION MCUs_per_row;  /* # of MCUs across the image */
00404   JDIMENSION MCU_rows_in_scan;  /* # of MCU rows in the image */
00405   
00406   int data_units_in_MCU;    /* # of data units per MCU */
00407   int MCU_membership[C_MAX_DATA_UNITS_IN_MCU];
00408   /* MCU_membership[i] is index in cur_comp_info of component owning */
00409   /* i'th block in an MCU */
00410 
00411   int Ss, Se, Ah, Al;       /* progressive/lossless JPEG parameters for scan */
00412 
00413   /*
00414    * Links to compression subobjects (methods and private variables of modules)
00415    */
00416   struct jpeg_comp_master * master;
00417   struct jpeg_c_main_controller * main;
00418   struct jpeg_c_prep_controller * prep;
00419   struct jpeg_c_codec * codec;
00420   struct jpeg_marker_writer * marker;
00421   struct jpeg_color_converter * cconvert;
00422   struct jpeg_downsampler * downsample;
00423   jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */
00424   int script_space_size;
00425 };
00426 
00427 
00428 /* Master record for a decompression instance */
00429 
00430 struct jpeg_decompress_struct {
00431   jpeg_common_fields;       /* Fields shared with jpeg_compress_struct */
00432 
00433   /* Source of compressed data */
00434   struct jpeg_source_mgr * src;
00435 
00436   /* Basic description of image --- filled in by jpeg_read_header(). */
00437   /* Application may inspect these values to decide how to process image. */
00438 
00439   JDIMENSION image_width;   /* nominal image width (from SOF marker) */
00440   JDIMENSION image_height;  /* nominal image height */
00441   int num_components;       /* # of color components in JPEG image */
00442   J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
00443 
00444   /* Decompression processing parameters --- these fields must be set before
00445    * calling jpeg_start_decompress().  Note that jpeg_read_header() initializes
00446    * them to default values.
00447    */
00448 
00449   J_COLOR_SPACE out_color_space; /* colorspace for output */
00450 
00451   unsigned int scale_num, scale_denom; /* fraction by which to scale image */
00452 
00453   double output_gamma;      /* image gamma wanted in output */
00454 
00455   boolean buffered_image;   /* TRUE=multiple output passes */
00456   boolean raw_data_out;     /* TRUE=downsampled data wanted */
00457 
00458   J_DCT_METHOD dct_method;  /* IDCT algorithm selector */
00459   boolean do_fancy_upsampling;  /* TRUE=apply fancy upsampling */
00460   boolean do_block_smoothing;   /* TRUE=apply interblock smoothing */
00461 
00462   boolean quantize_colors;  /* TRUE=colormapped output wanted */
00463   /* the following are ignored if not quantize_colors: */
00464   J_DITHER_MODE dither_mode;    /* type of color dithering to use */
00465   boolean two_pass_quantize;    /* TRUE=use two-pass color quantization */
00466   int desired_number_of_colors; /* max # colors to use in created colormap */
00467   /* these are significant only in buffered-image mode: */
00468   boolean enable_1pass_quant;   /* enable future use of 1-pass quantizer */
00469   boolean enable_external_quant;/* enable future use of external colormap */
00470   boolean enable_2pass_quant;   /* enable future use of 2-pass quantizer */
00471 
00472   /* Description of actual output image that will be returned to application.
00473    * These fields are computed by jpeg_start_decompress().
00474    * You can also use jpeg_calc_output_dimensions() to determine these values
00475    * in advance of calling jpeg_start_decompress().
00476    */
00477 
00478   JDIMENSION output_width;  /* scaled image width */
00479   JDIMENSION output_height; /* scaled image height */
00480   int out_color_components; /* # of color components in out_color_space */
00481   int output_components;    /* # of color components returned */
00482   /* output_components is 1 (a colormap index) when quantizing colors;
00483    * otherwise it equals out_color_components.
00484    */
00485   int rec_outbuf_height;    /* min recommended height of scanline buffer */
00486   /* If the buffer passed to jpeg_read_scanlines() is less than this many rows
00487    * high, space and time will be wasted due to unnecessary data copying.
00488    * Usually rec_outbuf_height will be 1 or 2, at most 4.
00489    */
00490 
00491   /* When quantizing colors, the output colormap is described by these fields.
00492    * The application can supply a colormap by setting colormap non-NULL before
00493    * calling jpeg_start_decompress; otherwise a colormap is created during
00494    * jpeg_start_decompress or jpeg_start_output.
00495    * The map has out_color_components rows and actual_number_of_colors columns.
00496    */
00497   int actual_number_of_colors;  /* number of entries in use */
00498   JSAMPARRAY colormap;      /* The color map as a 2-D pixel array */
00499 
00500   /* State variables: these variables indicate the progress of decompression.
00501    * The application may examine these but must not modify them.
00502    */
00503 
00504   /* Row index of next scanline to be read from jpeg_read_scanlines().
00505    * Application may use this to control its processing loop, e.g.,
00506    * "while (output_scanline < output_height)".
00507    */
00508   JDIMENSION output_scanline;   /* 0 .. output_height-1  */
00509 
00510   /* Current input scan number and number of iMCU rows completed in scan.
00511    * These indicate the progress of the decompressor input side.
00512    */
00513   int input_scan_number;    /* Number of SOS markers seen so far */
00514   JDIMENSION input_iMCU_row;    /* Number of iMCU rows completed */
00515 
00516   /* The "output scan number" is the notional scan being displayed by the
00517    * output side.  The decompressor will not allow output scan/row number
00518    * to get ahead of input scan/row, but it can fall arbitrarily far behind.
00519    */
00520   int output_scan_number;   /* Nominal scan number being displayed */
00521   JDIMENSION output_iMCU_row;   /* Number of iMCU rows read */
00522 
00523   /* Current progression status.  coef_bits[c][i] indicates the precision
00524    * with which component c's DCT coefficient i (in zigzag order) is known.
00525    * It is -1 when no data has yet been received, otherwise it is the point
00526    * transform (shift) value for the most recent scan of the coefficient
00527    * (thus, 0 at completion of the progression).
00528    * This pointer is NULL when reading a non-progressive file.
00529    */
00530   int (*coef_bits)[DCTSIZE2];   /* -1 or current Al value for each coef */
00531 
00532   /* Internal JPEG parameters --- the application usually need not look at
00533    * these fields.  Note that the decompressor output side may not use
00534    * any parameters that can change between scans.
00535    */
00536 
00537   /* Quantization and Huffman tables are carried forward across input
00538    * datastreams when processing abbreviated JPEG datastreams.
00539    */
00540 
00541   JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
00542   /* ptrs to coefficient quantization tables, or NULL if not defined */
00543 
00544   JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
00545   JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
00546   /* ptrs to Huffman coding tables, or NULL if not defined */
00547 
00548   /* These parameters are never carried across datastreams, since they
00549    * are given in SOF/SOS markers or defined to be reset by SOI.
00550    */
00551 
00552   int data_precision;       /* bits of precision in image data */
00553 
00554   jpeg_component_info * comp_info;
00555   /* comp_info[i] describes component that appears i'th in SOF */
00556 
00557   boolean arith_code;       /* TRUE=arithmetic coding, FALSE=Huffman */
00558 
00559   UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
00560   UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
00561   UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
00562 
00563   unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */
00564 
00565   /* These fields record data obtained from optional markers recognized by
00566    * the JPEG library.
00567    */
00568   boolean saw_JFIF_marker;  /* TRUE iff a JFIF APP0 marker was found */
00569   /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
00570   UINT8 JFIF_major_version; /* JFIF version number */
00571   UINT8 JFIF_minor_version;
00572   UINT8 density_unit;       /* JFIF code for pixel size units */
00573   UINT16 X_density;     /* Horizontal pixel density */
00574   UINT16 Y_density;     /* Vertical pixel density */
00575   boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */
00576   UINT8 Adobe_transform;    /* Color transform code from Adobe marker */
00577 
00578   boolean CCIR601_sampling; /* TRUE=first samples are cosited */
00579 
00580   /* Aside from the specific data retained from APPn markers known to the
00581    * library, the uninterpreted contents of any or all APPn and COM markers
00582    * can be saved in a list for examination by the application.
00583    */
00584   jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */
00585 
00586   /* Remaining fields are known throughout decompressor, but generally
00587    * should not be touched by a surrounding application.
00588    */
00589 
00590   /*
00591    * These fields are computed during decompression startup
00592    */
00593   int data_unit;        /* size of data unit in samples */
00594   J_CODEC_PROCESS process;  /* decoding process of JPEG image */
00595 
00596   int max_h_samp_factor;    /* largest h_samp_factor */
00597   int max_v_samp_factor;    /* largest v_samp_factor */
00598 
00599   int min_codec_data_unit;  /* smallest codec_data_unit of any component */
00600 
00601   JDIMENSION total_iMCU_rows;   /* # of iMCU rows in image */
00602   /* The codec's input and output progress is measured in units of "iMCU"
00603    * (interleaved MCU) rows.  These are the same as MCU rows in fully
00604    * interleaved JPEG scans, but are used whether the scan is interleaved
00605    * or not.  We define an iMCU row as v_samp_factor data_unit rows of each
00606    * component.  Therefore, the codec output contains
00607    * v_samp_factor*codec_data_unit sample rows of a component per iMCU row.
00608    */
00609 
00610   JSAMPLE * sample_range_limit; /* table for fast range-limiting */
00611 
00612   /*
00613    * These fields are valid during any one scan.
00614    * They describe the components and MCUs actually appearing in the scan.
00615    * Note that the decompressor output side must not use these fields.
00616    */
00617   int comps_in_scan;        /* # of JPEG components in this scan */
00618   jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
00619   /* *cur_comp_info[i] describes component that appears i'th in SOS */
00620 
00621   JDIMENSION MCUs_per_row;  /* # of MCUs across the image */
00622   JDIMENSION MCU_rows_in_scan;  /* # of MCU rows in the image */
00623 
00624   int data_units_in_MCU;    /* # of data _units per MCU */
00625   int MCU_membership[D_MAX_DATA_UNITS_IN_MCU];
00626   /* MCU_membership[i] is index in cur_comp_info of component owning */
00627   /* i'th data unit in an MCU */
00628 
00629   int Ss, Se, Ah, Al;       /* progressive/lossless JPEG parms for scan */
00630 
00631   /* This field is shared between entropy decoder and marker parser.
00632    * It is either zero or the code of a JPEG marker that has been
00633    * read from the data source, but has not yet been processed.
00634    */
00635   int unread_marker;
00636 
00637   /*
00638    * Links to decompression subobjects (methods, private variables of modules)
00639    */
00640   struct jpeg_decomp_master * master;
00641   struct jpeg_d_main_controller * main;
00642   struct jpeg_d_codec * codec;
00643   struct jpeg_d_post_controller * post;
00644   struct jpeg_input_controller * inputctl;
00645   struct jpeg_marker_reader * marker;
00646   struct jpeg_upsampler * upsample;
00647   struct jpeg_color_deconverter * cconvert;
00648   struct jpeg_color_quantizer * cquantize;
00649 
00650   /* Options that enable or disable various workarounds */
00651   unsigned int workaround_options;
00652 };
00653 
00654 /* constants for workaround_options in struct jpeg_decompress_struct */
00655 #define WORKAROUND_PREDICTOR6OVERFLOW 1
00656 
00657 /* "Object" declarations for JPEG modules that may be supplied or called
00658  * directly by the surrounding application.
00659  * As with all objects in the JPEG library, these structs only define the
00660  * publicly visible methods and state variables of a module.  Additional
00661  * private fields may exist after the public ones.
00662  */
00663 
00664 
00665 /* Error handler object */
00666 
00667 struct jpeg_error_mgr {
00668   /* Error exit handler: does not return to caller */
00669   JMETHOD(void, error_exit, (j_common_ptr cinfo));
00670   /* Conditionally emit a trace or warning message */
00671   JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
00672   /* Routine that actually outputs a trace or error message */
00673   JMETHOD(void, output_message, (j_common_ptr cinfo));
00674   /* Format a message string for the most recent JPEG error or message */
00675   JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer));
00676 #define JMSG_LENGTH_MAX  200    /* recommended size of format_message buffer */
00677   /* Reset error state variables at start of a new image */
00678   JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
00679   
00680   /* The message ID code and any parameters are saved here.
00681    * A message can have one string parameter or up to 8 int parameters.
00682    */
00683   int msg_code;
00684 #define JMSG_STR_PARM_MAX  80
00685   union {
00686     int i[8];
00687     char s[JMSG_STR_PARM_MAX];
00688   } msg_parm;
00689   
00690   /* Standard state variables for error facility */
00691   
00692   int trace_level;      /* max msg_level that will be displayed */
00693   
00694   /* For recoverable corrupt-data errors, we emit a warning message,
00695    * but keep going unless emit_message chooses to abort.  emit_message
00696    * should count warnings in num_warnings.  The surrounding application
00697    * can check for bad data by seeing if num_warnings is nonzero at the
00698    * end of processing.
00699    */
00700   long num_warnings;        /* number of corrupt-data warnings */
00701 
00702   /* These fields point to the table(s) of error message strings.
00703    * An application can change the table pointer to switch to a different
00704    * message list (typically, to change the language in which errors are
00705    * reported).  Some applications may wish to add additional error codes
00706    * that will be handled by the JPEG library error mechanism; the second
00707    * table pointer is used for this purpose.
00708    *
00709    * First table includes all errors generated by JPEG library itself.
00710    * Error code 0 is reserved for a "no such error string" message.
00711    */
00712   const char * const * jpeg_message_table; /* Library errors */
00713   int last_jpeg_message;    /* Table contains strings 0..last_jpeg_message */
00714   /* Second table can be added by application (see cjpeg/djpeg for example).
00715    * It contains strings numbered first_addon_message..last_addon_message.
00716    */
00717   const char * const * addon_message_table; /* Non-library errors */
00718   int first_addon_message;  /* code for first string in addon table */
00719   int last_addon_message;   /* code for last string in addon table */
00720 };
00721 
00722 
00723 /* Progress monitor object */
00724 
00725 struct jpeg_progress_mgr {
00726   JMETHOD(void, progress_monitor, (j_common_ptr cinfo));
00727 
00728   long pass_counter;        /* work units completed in this pass */
00729   long pass_limit;      /* total number of work units in this pass */
00730   int completed_passes;     /* passes completed so far */
00731   int total_passes;     /* total number of passes expected */
00732 };
00733 
00734 
00735 /* Data destination object for compression */
00736 
00737 struct jpeg_destination_mgr {
00738   JOCTET * next_output_byte;    /* => next byte to write in buffer */
00739   size_t free_in_buffer;    /* # of byte spaces remaining in buffer */
00740 
00741   JMETHOD(void, init_destination, (j_compress_ptr cinfo));
00742   JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo));
00743   JMETHOD(void, term_destination, (j_compress_ptr cinfo));
00744 };
00745 
00746 
00747 /* Data source object for decompression */
00748 
00749 struct jpeg_source_mgr {
00750   const JOCTET * next_input_byte; /* => next byte to read from buffer */
00751   size_t bytes_in_buffer;   /* # of bytes remaining in buffer */
00752 
00753   JMETHOD(void, init_source, (j_decompress_ptr cinfo));
00754   JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo));
00755   JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes));
00756   JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
00757   JMETHOD(void, term_source, (j_decompress_ptr cinfo));
00758 };
00759 
00760 
00761 /* Memory manager object.
00762  * Allocates "small" objects (a few K total), "large" objects (tens of K),
00763  * and "really big" objects (virtual arrays with backing store if needed).
00764  * The memory manager does not allow individual objects to be freed; rather,
00765  * each created object is assigned to a pool, and whole pools can be freed
00766  * at once.  This is faster and more convenient than remembering exactly what
00767  * to free, especially where malloc()/free() are not too speedy.
00768  * NB: alloc routines never return NULL.  They exit to error_exit if not
00769  * successful.
00770  */
00771 
00772 #define JPOOL_PERMANENT 0   /* lasts until master record is destroyed */
00773 #define JPOOL_IMAGE 1   /* lasts until done with image/datastream */
00774 #define JPOOL_NUMPOOLS  2
00775 
00776 typedef struct jvirt_sarray_control * jvirt_sarray_ptr;
00777 typedef struct jvirt_barray_control * jvirt_barray_ptr;
00778 
00779 
00780 #ifdef C_LOSSLESS_SUPPORTED
00781 #define NEED_DARRAY
00782 #else
00783 #ifdef D_LOSSLESS_SUPPORTED
00784 #define NEED_DARRAY
00785 #endif
00786 #endif
00787 
00788 struct jpeg_memory_mgr {
00789   /* Method pointers */
00790   JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id,
00791                 size_t sizeofobject));
00792   JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id,
00793                      size_t sizeofobject));
00794   JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id,
00795                      JDIMENSION samplesperrow,
00796                      JDIMENSION numrows));
00797   JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id,
00798                       JDIMENSION blocksperrow,
00799                       JDIMENSION numrows));
00800 #ifdef NEED_DARRAY
00801   JMETHOD(JDIFFARRAY, alloc_darray, (j_common_ptr cinfo, int pool_id,
00802                      JDIMENSION diffsperrow,
00803                      JDIMENSION numrows));
00804 #endif
00805   JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo,
00806                           int pool_id,
00807                           boolean pre_zero,
00808                           JDIMENSION samplesperrow,
00809                           JDIMENSION numrows,
00810                           JDIMENSION maxaccess));
00811   JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo,
00812                           int pool_id,
00813                           boolean pre_zero,
00814                           JDIMENSION blocksperrow,
00815                           JDIMENSION numrows,
00816                           JDIMENSION maxaccess));
00817   JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo));
00818   JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo,
00819                        jvirt_sarray_ptr ptr,
00820                        JDIMENSION start_row,
00821                        JDIMENSION num_rows,
00822                        boolean writable));
00823   JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo,
00824                         jvirt_barray_ptr ptr,
00825                         JDIMENSION start_row,
00826                         JDIMENSION num_rows,
00827                         boolean writable));
00828   JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id));
00829   JMETHOD(void, self_destruct, (j_common_ptr cinfo));
00830 
00831   /* Limit on memory allocation for this JPEG object.  (Note that this is
00832    * merely advisory, not a guaranteed maximum; it only affects the space
00833    * used for virtual-array buffers.)  May be changed by outer application
00834    * after creating the JPEG object.
00835    */
00836   long max_memory_to_use;
00837 
00838   /* Maximum allocation request accepted by alloc_large. */
00839   long max_alloc_chunk;
00840 };
00841 
00842 
00843 /* Routine signature for application-supplied marker processing methods.
00844  * Need not pass marker code since it is stored in cinfo->unread_marker.
00845  */
00846 typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
00847 
00848 
00849 /* Declarations for routines called by application.
00850  * The JPP macro hides prototype parameters from compilers that can't cope.
00851  * Note JPP requires double parentheses.
00852  */
00853 
00854 #ifdef HAVE_PROTOTYPES
00855 #define JPP(arglist)    arglist
00856 #else
00857 #define JPP(arglist)    ()
00858 #endif
00859 
00860 
00861 /* Short forms of external names for systems with brain-damaged linkers.
00862  * We shorten external names to be unique in the first six letters, which
00863  * is good enough for all known systems.
00864  * (If your compiler itself needs names to be unique in less than 15 
00865  * characters, you are out of luck.  Get a better compiler.)
00866  */
00867 
00868 /* MAKE SURE THAT ALL FUNCTIONS DECLARED GLOBAL() ARE RE-DEFINED HERE! */
00869 
00870 #ifdef NEED_SHORT_EXTERNAL_NAMES
00871 #define jcopy_block_row                jcopy16_block_row
00872 #define jcopy_sample_rows              jcopy16_sample_rows
00873 #define jdiv_round_up                  jdiv16_round_up
00874 #define jinit_1pass_quantizer          jinit16_1pass_quantizer
00875 #define jinit_2pass_quantizer          jinit16_2pass_quantizer
00876 #define jinit_arith_decoder            jinit16_arith_decoder
00877 #define jinit_arith_encoder            jinit16_arith_encoder
00878 #define jinit_c_codec                  jinit16_c_codec
00879 #define jinit_c_coef_controller        jinit16_c_coef_controller
00880 #define jinit_c_diff_controller        jinit16_c_diff_controller
00881 #define jinit_c_main_controller        jinit16_c_main_controller
00882 #define jinit_c_master_control         jinit16_c_master_control
00883 #define jinit_c_prep_controller        jinit16_c_prep_controller
00884 #define jinit_c_scaler                 jinit16_c_scaler
00885 #define jinit_color_converter          jinit16_color_converter
00886 #define jinit_color_deconverter        jinit16_color_deconverter
00887 #define jinit_compress_master          jinit16_compress_master
00888 #define jinit_d_codec                  jinit16_d_codec
00889 #define jinit_d_coef_controller        jinit16_d_coef_controller
00890 #define jinit_d_diff_controller        jinit16_d_diff_controller
00891 #define jinit_d_main_controller        jinit16_d_main_controller
00892 #define jinit_d_post_controller        jinit16_d_post_controller
00893 #define jinit_d_post_controller        jinit16_d_post_controller
00894 #define jinit_d_scaler                 jinit16_d_scaler
00895 #define jinit_differencer              jinit16_differencer
00896 #define jinit_downsampler              jinit16_downsampler
00897 #define jinit_forward_dct              jinit16_forward_dct
00898 #define jinit_input_controller         jinit16_input_controller
00899 #define jinit_inverse_dct              jinit16_inverse_dct
00900 #define jinit_lhuff_decoder            jinit16_lhuff_decoder
00901 #define jinit_lhuff_encoder            jinit16_lhuff_encoder
00902 #define jinit_lossless_c_codec         jinit16_lossless_c_codec
00903 #define jinit_lossless_d_codec         jinit16_lossless_d_codec
00904 #define jinit_lossy_c_codec            jinit16_lossy_c_codec
00905 #define jinit_lossy_d_codec            jinit16_lossy_d_codec
00906 #define jinit_marker_reader            jinit16_marker_reader
00907 #define jinit_marker_writer            jinit16_marker_writer
00908 #define jinit_master_decompress        jinit16_master_decompress
00909 #define jinit_memory_mgr               jinit16_memory_mgr
00910 #define jinit_merged_upsampler         jinit16_merged_upsampler
00911 #define jinit_phuff_decoder            jinit16_phuff_decoder
00912 #define jinit_phuff_encoder            jinit16_phuff_encoder
00913 #define jinit_shuff_decoder            jinit16_shuff_decoder
00914 #define jinit_shuff_encoder            jinit16_shuff_encoder
00915 #define jinit_undifferencer            jinit16_undifferencer
00916 #define jinit_upsampler                jinit16_upsampler
00917 #define jpeg_CreateCompress            jpeg16_CreateCompress
00918 #define jpeg_CreateDecompress          jpeg16_CreateDecompress
00919 #define jpeg_abort                     jpeg16_abort
00920 #define jpeg_abort_compress            jpeg16_abort_compress
00921 #define jpeg_abort_decompress          jpeg16_abort_decompress
00922 #define jpeg_add_quant_table           jpeg16_add_quant_table
00923 #define jpeg_alloc_huff_table          jpeg16_alloc_huff_table
00924 #define jpeg_alloc_quant_table         jpeg16_alloc_quant_table
00925 #define jpeg_calc_output_dimensions    jpeg16_calc_output_dimensions
00926 #define jpeg_consume_input             jpeg16_consume_input
00927 #define jpeg_copy_critical_parameters  jpeg16_copy_critical_parameters
00928 #define jpeg_default_colorspace        jpeg16_default_colorspace
00929 #define jpeg_destroy                   jpeg16_destroy
00930 #define jpeg_destroy_compress          jpeg16_destroy_compress
00931 #define jpeg_destroy_decompress        jpeg16_destroy_decompress
00932 #define jpeg_fdct_float                jpeg16_fdct_float
00933 #define jpeg_fdct_ifast                jpeg16_fdct_ifast
00934 #define jpeg_fdct_islow                jpeg16_fdct_islow
00935 #define jpeg_fill_bit_buffer           jpeg16_fill_bit_buffer
00936 #define jpeg_finish_compress           jpeg16_finish_compress
00937 #define jpeg_finish_decompress         jpeg16_finish_decompress
00938 #define jpeg_finish_output             jpeg16_finish_output
00939 #define jpeg_free_large                jpeg16_free_large
00940 #define jpeg_free_small                jpeg16_free_small
00941 #define jpeg_gen_optimal_table         jpeg16_gen_optimal_table
00942 #define jpeg_get_large                 jpeg16_get_large
00943 #define jpeg_get_small                 jpeg16_get_small
00944 #define jpeg_has_multiple_scans        jpeg16_has_multiple_scans
00945 #define jpeg_huff_decode               jpeg16_huff_decode
00946 #define jpeg_idct_1x1                  jpeg16_idct_1x1
00947 #define jpeg_idct_2x2                  jpeg16_idct_2x2
00948 #define jpeg_idct_4x4                  jpeg16_idct_4x4
00949 #define jpeg_idct_float                jpeg16_idct_float
00950 #define jpeg_idct_ifast                jpeg16_idct_ifast
00951 #define jpeg_idct_islow                jpeg16_idct_islow
00952 #define jpeg_input_complete            jpeg16_input_complete
00953 #define jpeg_make_c_derived_tbl        jpeg16_make_c_derived_tbl
00954 #define jpeg_make_d_derived_tbl        jpeg16_make_d_derived_tbl
00955 #define jpeg_mem_available             jpeg16_mem_available
00956 #define jpeg_mem_init                  jpeg16_mem_init
00957 #define jpeg_mem_term                  jpeg16_mem_term
00958 #define jpeg_new_colormap              jpeg16_new_colormap
00959 #define jpeg_open_backing_store        jpeg16_open_backing_store
00960 #define jpeg_quality_scaling           jpeg16_quality_scaling
00961 #define jpeg_read_coefficients         jpeg16_read_coefficients
00962 #define jpeg_read_header               jpeg16_read_header
00963 #define jpeg_read_raw_data             jpeg16_read_raw_data
00964 #define jpeg_read_scanlines            jpeg16_read_scanlines
00965 #define jpeg_resync_to_restart         jpeg16_resync_to_restart
00966 #define jpeg_save_markers              jpeg16_save_markers
00967 #define jpeg_set_colorspace            jpeg16_set_colorspace
00968 #define jpeg_set_defaults              jpeg16_set_defaults
00969 #define jpeg_set_linear_quality        jpeg16_set_linear_quality
00970 #define jpeg_set_marker_processor      jpeg16_set_marker_processor
00971 #define jpeg_set_quality               jpeg16_set_quality
00972 #define jpeg_simple_lossless           jpeg16_simple_lossless
00973 #define jpeg_simple_progression        jpeg16_simple_progression
00974 #define jpeg_start_compress            jpeg16_start_compress
00975 #define jpeg_start_decompress          jpeg16_start_decompress
00976 #define jpeg_start_output              jpeg16_start_output
00977 #define jpeg_std_error                 jpeg16_std_error
00978 #define jpeg_stdio_dest                jpeg16_stdio_dest
00979 #define jpeg_stdio_src                 jpeg16_stdio_src
00980 #define jpeg_suppress_tables           jpeg16_suppress_tables
00981 #define jpeg_write_coefficients        jpeg16_write_coefficients
00982 #define jpeg_write_m_byte              jpeg16_write_m_byte
00983 #define jpeg_write_m_header            jpeg16_write_m_header
00984 #define jpeg_write_marker              jpeg16_write_marker
00985 #define jpeg_write_raw_data            jpeg16_write_raw_data
00986 #define jpeg_write_scanlines           jpeg16_write_scanlines
00987 #define jpeg_write_tables              jpeg16_write_tables
00988 #define jround_up                      jround16_up
00989 #define jzero_far                      jzero16_far
00990 #endif /* NEED_SHORT_EXTERNAL_NAMES */
00991 
00992 
00993 /* Default error-management setup */
00994 EXTERN(struct jpeg_error_mgr *) jpeg_std_error
00995     JPP((struct jpeg_error_mgr * err));
00996 
00997 /* Initialization of JPEG compression objects.
00998  * jpeg_create_compress() and jpeg_create_decompress() are the exported
00999  * names that applications should call.  These expand to calls on
01000  * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
01001  * passed for version mismatch checking.
01002  * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
01003  */
01004 #define jpeg_create_compress(cinfo) \
01005     jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
01006             (size_t) sizeof(struct jpeg_compress_struct))
01007 #define jpeg_create_decompress(cinfo) \
01008     jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
01009               (size_t) sizeof(struct jpeg_decompress_struct))
01010 EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo,
01011                       int version, size_t structsize));
01012 EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo,
01013                     int version, size_t structsize));
01014 /* Destruction of JPEG compression objects */
01015 EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo));
01016 EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
01017 
01018 /* Standard data source and destination managers: stdio streams. */
01019 /* Caller is responsible for opening the file before and closing after. */
01020 EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
01021 EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile));
01022 
01023 /* Default parameter setup for compression */
01024 EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo));
01025 /* Compression parameter setup aids */
01026 EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo,
01027                       J_COLOR_SPACE colorspace));
01028 EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo));
01029 EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality,
01030                    boolean force_baseline));
01031 EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo,
01032                       int scale_factor,
01033                       boolean force_baseline));
01034 EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
01035                        const unsigned int *basic_table,
01036                        int scale_factor,
01037                        boolean force_baseline));
01038 EXTERN(int) jpeg_quality_scaling JPP((int quality));
01039 EXTERN(void) jpeg_simple_lossless JPP((j_compress_ptr cinfo,
01040                        int predictor, int point_transform));
01041 EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo));
01042 EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo,
01043                        boolean suppress));
01044 EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo));
01045 EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo));
01046 
01047 /* Main entry points for compression */
01048 EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo,
01049                       boolean write_all_tables));
01050 EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo,
01051                          JSAMPARRAY scanlines,
01052                          JDIMENSION num_lines));
01053 EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo));
01054 
01055 /* Replaces jpeg_write_scanlines when writing raw downsampled data. */
01056 EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo,
01057                         JSAMPIMAGE data,
01058                         JDIMENSION num_lines));
01059 
01060 /* Write a special marker.  See libjpeg.doc concerning safe usage. */
01061 EXTERN(void) jpeg_write_marker
01062     JPP((j_compress_ptr cinfo, int marker,
01063          const JOCTET * dataptr, unsigned int datalen));
01064 /* Same, but piecemeal. */
01065 EXTERN(void) jpeg_write_m_header
01066     JPP((j_compress_ptr cinfo, int marker, unsigned int datalen));
01067 EXTERN(void) jpeg_write_m_byte
01068     JPP((j_compress_ptr cinfo, int val));
01069 
01070 /* Alternate compression function: just write an abbreviated table file */
01071 EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo));
01072 
01073 /* Decompression startup: read start of JPEG datastream to see what's there */
01074 EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo,
01075                   boolean require_image));
01076 /* Return value is one of: */
01077 #define JPEG_SUSPENDED      0 /* Suspended due to lack of input data */
01078 #define JPEG_HEADER_OK      1 /* Found valid image datastream */
01079 #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */
01080 /* If you pass require_image = TRUE (normal case), you need not check for
01081  * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
01082  * JPEG_SUSPENDED is only possible if you use a data source module that can
01083  * give a suspension return (the stdio source module doesn't).
01084  */
01085 
01086 /* Main entry points for decompression */
01087 EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo));
01088 EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo,
01089                         JSAMPARRAY scanlines,
01090                         JDIMENSION max_lines));
01091 EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo));
01092 
01093 /* Replaces jpeg_read_scanlines when reading raw downsampled data. */
01094 EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo,
01095                        JSAMPIMAGE data,
01096                        JDIMENSION max_lines));
01097 
01098 /* Additional entry points for buffered-image mode. */
01099 EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
01100 EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo,
01101                        int scan_number));
01102 EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo));
01103 EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo));
01104 EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo));
01105 EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo));
01106 /* Return value is one of: */
01107 /* #define JPEG_SUSPENDED   0    Suspended due to lack of input data */
01108 #define JPEG_REACHED_SOS    1 /* Reached start of new scan */
01109 #define JPEG_REACHED_EOI    2 /* Reached end of image */
01110 #define JPEG_ROW_COMPLETED  3 /* Completed one iMCU row */
01111 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */
01112 
01113 /* Precalculate output dimensions for current decompression parameters. */
01114 EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
01115 
01116 /* Control saving of COM and APPn markers into marker_list. */
01117 EXTERN(void) jpeg_save_markers
01118     JPP((j_decompress_ptr cinfo, int marker_code,
01119          unsigned int length_limit));
01120 
01121 /* Install a special processing method for COM or APPn markers. */
01122 EXTERN(void) jpeg_set_marker_processor
01123     JPP((j_decompress_ptr cinfo, int marker_code,
01124          jpeg_marker_parser_method routine));
01125 
01126 /* Read or write raw DCT coefficients --- useful for lossless transcoding. */
01127 EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
01128 EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo,
01129                       jvirt_barray_ptr * coef_arrays));
01130 EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo,
01131                         j_compress_ptr dstinfo));
01132 
01133 /* If you choose to abort compression or decompression before completing
01134  * jpeg_finish_(de)compress, then you need to clean up to release memory,
01135  * temporary files, etc.  You can just call jpeg_destroy_(de)compress
01136  * if you're done with the JPEG object, but if you want to clean it up and
01137  * reuse it, call this:
01138  */
01139 EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo));
01140 EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo));
01141 
01142 /* Generic versions of jpeg_abort and jpeg_destroy that work on either
01143  * flavor of JPEG object.  These may be more convenient in some places.
01144  */
01145 EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo));
01146 EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo));
01147 
01148 /* Default restart-marker-resync procedure for use by data source modules */
01149 EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo,
01150                         int desired));
01151 
01152 
01153 /* These marker codes are exported since applications and data source modules
01154  * are likely to want to use them.
01155  */
01156 
01157 #define JPEG_RST0   0xD0    /* RST0 marker code */
01158 #define JPEG_EOI    0xD9    /* EOI marker code */
01159 #define JPEG_APP0   0xE0    /* APP0 marker code */
01160 #define JPEG_COM    0xFE    /* COM marker code */
01161 
01162 
01163 /* If we have a brain-damaged compiler that emits warnings (or worse, errors)
01164  * for structure definitions that are never filled in, keep it quiet by
01165  * supplying dummy definitions for the various substructures.
01166  */
01167 
01168 #ifdef INCOMPLETE_TYPES_BROKEN
01169 #ifndef JPEG_INTERNALS      /* will be defined in jpegint.h */
01170 struct jvirt_sarray_control { long dummy; };
01171 struct jvirt_barray_control { long dummy; };
01172 struct jpeg_comp_master { long dummy; };
01173 struct jpeg_c_main_controller { long dummy; };
01174 struct jpeg_c_prep_controller { long dummy; };
01175 struct jpeg_c_coef_controller { long dummy; };
01176 struct jpeg_marker_writer { long dummy; };
01177 struct jpeg_color_converter { long dummy; };
01178 struct jpeg_downsampler { long dummy; };
01179 struct jpeg_forward_dct { long dummy; };
01180 struct jpeg_entropy_encoder { long dummy; };
01181 struct jpeg_decomp_master { long dummy; };
01182 struct jpeg_d_main_controller { long dummy; };
01183 struct jpeg_d_coef_controller { long dummy; };
01184 struct jpeg_d_post_controller { long dummy; };
01185 struct jpeg_input_controller { long dummy; };
01186 struct jpeg_marker_reader { long dummy; };
01187 struct jpeg_entropy_decoder { long dummy; };
01188 struct jpeg_inverse_dct { long dummy; };
01189 struct jpeg_upsampler { long dummy; };
01190 struct jpeg_color_deconverter { long dummy; };
01191 struct jpeg_color_quantizer { long dummy; };
01192 #endif /* JPEG_INTERNALS */
01193 #endif /* INCOMPLETE_TYPES_BROKEN */
01194 
01195 
01196 /*
01197  * The JPEG library modules define JPEG_INTERNALS before including this file.
01198  * The internal structure declarations are read only when that is true.
01199  * Applications using the library should not include jpegint.h, but may wish
01200  * to include jerror.h.
01201  */
01202 
01203 #ifdef JPEG_INTERNALS
01204 #include "jpegint16.h"      /* fetch private declarations */
01205 #include "jerror16.h"       /* fetch error codes too */
01206 #endif
01207 
01208 #endif /* JPEGLIB_H */


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