nuclear@26: /* nuclear@26: * jpeglib.h nuclear@26: * nuclear@26: * Copyright (C) 1991-1998, Thomas G. Lane. nuclear@26: * This file is part of the Independent JPEG Group's software. nuclear@26: * For conditions of distribution and use, see the accompanying README file. nuclear@26: * nuclear@26: * This file defines the application interface for the JPEG library. nuclear@26: * Most applications using the library need only include this file, nuclear@26: * and perhaps jerror.h if they want to know the exact error codes. nuclear@26: */ nuclear@26: nuclear@26: #ifndef JPEGLIB_H nuclear@26: #define JPEGLIB_H nuclear@26: nuclear@26: /* nuclear@26: * First we include the configuration files that record how this nuclear@26: * installation of the JPEG library is set up. jconfig.h can be nuclear@26: * generated automatically for many systems. jmorecfg.h contains nuclear@26: * manual configuration options that most people need not worry about. nuclear@26: */ nuclear@26: nuclear@26: #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */ nuclear@26: #include "jconfig.h" /* widely used configuration options */ nuclear@26: #endif nuclear@26: #include "jmorecfg.h" /* seldom changed options */ nuclear@26: nuclear@26: nuclear@26: /* Version ID for the JPEG library. nuclear@26: * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60". nuclear@26: */ nuclear@26: nuclear@26: #define JPEG_LIB_VERSION 62 /* Version 6b */ nuclear@26: nuclear@26: nuclear@26: /* Various constants determining the sizes of things. nuclear@26: * All of these are specified by the JPEG standard, so don't change them nuclear@26: * if you want to be compatible. nuclear@26: */ nuclear@26: nuclear@26: #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */ nuclear@26: #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */ nuclear@26: #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */ nuclear@26: #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */ nuclear@26: #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */ nuclear@26: #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */ nuclear@26: #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */ nuclear@26: /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard; nuclear@26: * the PostScript DCT filter can emit files with many more than 10 blocks/MCU. nuclear@26: * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU nuclear@26: * to handle it. We even let you do this from the jconfig.h file. However, nuclear@26: * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe nuclear@26: * sometimes emits noncompliant files doesn't mean you should too. nuclear@26: */ nuclear@26: #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */ nuclear@26: #ifndef D_MAX_BLOCKS_IN_MCU nuclear@26: #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */ nuclear@26: #endif nuclear@26: nuclear@26: nuclear@26: /* Data structures for images (arrays of samples and of DCT coefficients). nuclear@26: * On 80x86 machines, the image arrays are too big for near pointers, nuclear@26: * but the pointer arrays can fit in near memory. nuclear@26: */ nuclear@26: nuclear@26: typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */ nuclear@26: typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ nuclear@26: typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ nuclear@26: nuclear@26: typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ nuclear@26: typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */ nuclear@26: typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ nuclear@26: typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ nuclear@26: nuclear@26: typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */ nuclear@26: nuclear@26: nuclear@26: /* Types for JPEG compression parameters and working tables. */ nuclear@26: nuclear@26: nuclear@26: /* DCT coefficient quantization tables. */ nuclear@26: nuclear@26: typedef struct { nuclear@26: /* This array gives the coefficient quantizers in natural array order nuclear@26: * (not the zigzag order in which they are stored in a JPEG DQT marker). nuclear@26: * CAUTION: IJG versions prior to v6a kept this array in zigzag order. nuclear@26: */ nuclear@26: UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */ nuclear@26: /* This field is used only during compression. It's initialized FALSE when nuclear@26: * the table is created, and set TRUE when it's been output to the file. nuclear@26: * You could suppress output of a table by setting this to TRUE. nuclear@26: * (See jpeg_suppress_tables for an example.) nuclear@26: */ nuclear@26: boolean sent_table; /* TRUE when table has been output */ nuclear@26: } JQUANT_TBL; nuclear@26: nuclear@26: nuclear@26: /* Huffman coding tables. */ nuclear@26: nuclear@26: typedef struct { nuclear@26: /* These two fields directly represent the contents of a JPEG DHT marker */ nuclear@26: UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ nuclear@26: /* length k bits; bits[0] is unused */ nuclear@26: UINT8 huffval[256]; /* The symbols, in order of incr code length */ nuclear@26: /* This field is used only during compression. It's initialized FALSE when nuclear@26: * the table is created, and set TRUE when it's been output to the file. nuclear@26: * You could suppress output of a table by setting this to TRUE. nuclear@26: * (See jpeg_suppress_tables for an example.) nuclear@26: */ nuclear@26: boolean sent_table; /* TRUE when table has been output */ nuclear@26: } JHUFF_TBL; nuclear@26: nuclear@26: nuclear@26: /* Basic info about one component (color channel). */ nuclear@26: nuclear@26: typedef struct { nuclear@26: /* These values are fixed over the whole image. */ nuclear@26: /* For compression, they must be supplied by parameter setup; */ nuclear@26: /* for decompression, they are read from the SOF marker. */ nuclear@26: int component_id; /* identifier for this component (0..255) */ nuclear@26: int component_index; /* its index in SOF or cinfo->comp_info[] */ nuclear@26: int h_samp_factor; /* horizontal sampling factor (1..4) */ nuclear@26: int v_samp_factor; /* vertical sampling factor (1..4) */ nuclear@26: int quant_tbl_no; /* quantization table selector (0..3) */ nuclear@26: /* These values may vary between scans. */ nuclear@26: /* For compression, they must be supplied by parameter setup; */ nuclear@26: /* for decompression, they are read from the SOS marker. */ nuclear@26: /* The decompressor output side may not use these variables. */ nuclear@26: int dc_tbl_no; /* DC entropy table selector (0..3) */ nuclear@26: int ac_tbl_no; /* AC entropy table selector (0..3) */ nuclear@26: nuclear@26: /* Remaining fields should be treated as private by applications. */ nuclear@26: nuclear@26: /* These values are computed during compression or decompression startup: */ nuclear@26: /* Component's size in DCT blocks. nuclear@26: * Any dummy blocks added to complete an MCU are not counted; therefore nuclear@26: * these values do not depend on whether a scan is interleaved or not. nuclear@26: */ nuclear@26: JDIMENSION width_in_blocks; nuclear@26: JDIMENSION height_in_blocks; nuclear@26: /* Size of a DCT block in samples. Always DCTSIZE for compression. nuclear@26: * For decompression this is the size of the output from one DCT block, nuclear@26: * reflecting any scaling we choose to apply during the IDCT step. nuclear@26: * Values of 1,2,4,8 are likely to be supported. Note that different nuclear@26: * components may receive different IDCT scalings. nuclear@26: */ nuclear@26: int DCT_scaled_size; nuclear@26: /* The downsampled dimensions are the component's actual, unpadded number nuclear@26: * of samples at the main buffer (preprocessing/compression interface), thus nuclear@26: * downsampled_width = ceil(image_width * Hi/Hmax) nuclear@26: * and similarly for height. For decompression, IDCT scaling is included, so nuclear@26: * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE) nuclear@26: */ nuclear@26: JDIMENSION downsampled_width; /* actual width in samples */ nuclear@26: JDIMENSION downsampled_height; /* actual height in samples */ nuclear@26: /* This flag is used only for decompression. In cases where some of the nuclear@26: * components will be ignored (eg grayscale output from YCbCr image), nuclear@26: * we can skip most computations for the unused components. nuclear@26: */ nuclear@26: boolean component_needed; /* do we need the value of this component? */ nuclear@26: nuclear@26: /* These values are computed before starting a scan of the component. */ nuclear@26: /* The decompressor output side may not use these variables. */ nuclear@26: int MCU_width; /* number of blocks per MCU, horizontally */ nuclear@26: int MCU_height; /* number of blocks per MCU, vertically */ nuclear@26: int MCU_blocks; /* MCU_width * MCU_height */ nuclear@26: int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */ nuclear@26: int last_col_width; /* # of non-dummy blocks across in last MCU */ nuclear@26: int last_row_height; /* # of non-dummy blocks down in last MCU */ nuclear@26: nuclear@26: /* Saved quantization table for component; NULL if none yet saved. nuclear@26: * See jdinput.c comments about the need for this information. nuclear@26: * This field is currently used only for decompression. nuclear@26: */ nuclear@26: JQUANT_TBL * quant_table; nuclear@26: nuclear@26: /* Private per-component storage for DCT or IDCT subsystem. */ nuclear@26: void * dct_table; nuclear@26: } jpeg_component_info; nuclear@26: nuclear@26: nuclear@26: /* The script for encoding a multiple-scan file is an array of these: */ nuclear@26: nuclear@26: typedef struct { nuclear@26: int comps_in_scan; /* number of components encoded in this scan */ nuclear@26: int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */ nuclear@26: int Ss, Se; /* progressive JPEG spectral selection parms */ nuclear@26: int Ah, Al; /* progressive JPEG successive approx. parms */ nuclear@26: } jpeg_scan_info; nuclear@26: nuclear@26: /* The decompressor can save APPn and COM markers in a list of these: */ nuclear@26: nuclear@26: typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr; nuclear@26: nuclear@26: struct jpeg_marker_struct { nuclear@26: jpeg_saved_marker_ptr next; /* next in list, or NULL */ nuclear@26: UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */ nuclear@26: unsigned int original_length; /* # bytes of data in the file */ nuclear@26: unsigned int data_length; /* # bytes of data saved at data[] */ nuclear@26: JOCTET FAR * data; /* the data contained in the marker */ nuclear@26: /* the marker length word is not counted in data_length or original_length */ nuclear@26: }; nuclear@26: nuclear@26: /* Known color spaces. */ nuclear@26: nuclear@26: typedef enum { nuclear@26: JCS_UNKNOWN, /* error/unspecified */ nuclear@26: JCS_GRAYSCALE, /* monochrome */ nuclear@26: JCS_RGB, /* red/green/blue */ nuclear@26: JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ nuclear@26: JCS_CMYK, /* C/M/Y/K */ nuclear@26: JCS_YCCK /* Y/Cb/Cr/K */ nuclear@26: } J_COLOR_SPACE; nuclear@26: nuclear@26: /* DCT/IDCT algorithm options. */ nuclear@26: nuclear@26: typedef enum { nuclear@26: JDCT_ISLOW, /* slow but accurate integer algorithm */ nuclear@26: JDCT_IFAST, /* faster, less accurate integer method */ nuclear@26: JDCT_FLOAT /* floating-point: accurate, fast on fast HW */ nuclear@26: } J_DCT_METHOD; nuclear@26: nuclear@26: #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */ nuclear@26: #define JDCT_DEFAULT JDCT_ISLOW nuclear@26: #endif nuclear@26: #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */ nuclear@26: #define JDCT_FASTEST JDCT_IFAST nuclear@26: #endif nuclear@26: nuclear@26: /* Dithering options for decompression. */ nuclear@26: nuclear@26: typedef enum { nuclear@26: JDITHER_NONE, /* no dithering */ nuclear@26: JDITHER_ORDERED, /* simple ordered dither */ nuclear@26: JDITHER_FS /* Floyd-Steinberg error diffusion dither */ nuclear@26: } J_DITHER_MODE; nuclear@26: nuclear@26: nuclear@26: /* Common fields between JPEG compression and decompression master structs. */ nuclear@26: nuclear@26: #define jpeg_common_fields \ nuclear@26: struct jpeg_error_mgr * err; /* Error handler module */\ nuclear@26: struct jpeg_memory_mgr * mem; /* Memory manager module */\ nuclear@26: struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\ nuclear@26: void * client_data; /* Available for use by application */\ nuclear@26: boolean is_decompressor; /* So common code can tell which is which */\ nuclear@26: int global_state /* For checking call sequence validity */ nuclear@26: nuclear@26: /* Routines that are to be used by both halves of the library are declared nuclear@26: * to receive a pointer to this structure. There are no actual instances of nuclear@26: * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct. nuclear@26: */ nuclear@26: struct jpeg_common_struct { nuclear@26: jpeg_common_fields; /* Fields common to both master struct types */ nuclear@26: /* Additional fields follow in an actual jpeg_compress_struct or nuclear@26: * jpeg_decompress_struct. All three structs must agree on these nuclear@26: * initial fields! (This would be a lot cleaner in C++.) nuclear@26: */ nuclear@26: }; nuclear@26: nuclear@26: typedef struct jpeg_common_struct * j_common_ptr; nuclear@26: typedef struct jpeg_compress_struct * j_compress_ptr; nuclear@26: typedef struct jpeg_decompress_struct * j_decompress_ptr; nuclear@26: nuclear@26: nuclear@26: /* Master record for a compression instance */ nuclear@26: nuclear@26: struct jpeg_compress_struct { nuclear@26: jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */ nuclear@26: nuclear@26: /* Destination for compressed data */ nuclear@26: struct jpeg_destination_mgr * dest; nuclear@26: nuclear@26: /* Description of source image --- these fields must be filled in by nuclear@26: * outer application before starting compression. in_color_space must nuclear@26: * be correct before you can even call jpeg_set_defaults(). nuclear@26: */ nuclear@26: nuclear@26: JDIMENSION image_width; /* input image width */ nuclear@26: JDIMENSION image_height; /* input image height */ nuclear@26: int input_components; /* # of color components in input image */ nuclear@26: J_COLOR_SPACE in_color_space; /* colorspace of input image */ nuclear@26: nuclear@26: double input_gamma; /* image gamma of input image */ nuclear@26: nuclear@26: /* Compression parameters --- these fields must be set before calling nuclear@26: * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to nuclear@26: * initialize everything to reasonable defaults, then changing anything nuclear@26: * the application specifically wants to change. That way you won't get nuclear@26: * burnt when new parameters are added. Also note that there are several nuclear@26: * helper routines to simplify changing parameters. nuclear@26: */ nuclear@26: nuclear@26: int data_precision; /* bits of precision in image data */ nuclear@26: nuclear@26: int num_components; /* # of color components in JPEG image */ nuclear@26: J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ nuclear@26: nuclear@26: jpeg_component_info * comp_info; nuclear@26: /* comp_info[i] describes component that appears i'th in SOF */ nuclear@26: nuclear@26: JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; nuclear@26: /* ptrs to coefficient quantization tables, or NULL if not defined */ nuclear@26: nuclear@26: JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; nuclear@26: JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; nuclear@26: /* ptrs to Huffman coding tables, or NULL if not defined */ nuclear@26: nuclear@26: UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ nuclear@26: UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ nuclear@26: UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ nuclear@26: nuclear@26: int num_scans; /* # of entries in scan_info array */ nuclear@26: const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ nuclear@26: /* The default value of scan_info is NULL, which causes a single-scan nuclear@26: * sequential JPEG file to be emitted. To create a multi-scan file, nuclear@26: * set num_scans and scan_info to point to an array of scan definitions. nuclear@26: */ nuclear@26: nuclear@26: boolean raw_data_in; /* TRUE=caller supplies downsampled data */ nuclear@26: boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ nuclear@26: boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ nuclear@26: boolean CCIR601_sampling; /* TRUE=first samples are cosited */ nuclear@26: int smoothing_factor; /* 1..100, or 0 for no input smoothing */ nuclear@26: J_DCT_METHOD dct_method; /* DCT algorithm selector */ nuclear@26: nuclear@26: /* The restart interval can be specified in absolute MCUs by setting nuclear@26: * restart_interval, or in MCU rows by setting restart_in_rows nuclear@26: * (in which case the correct restart_interval will be figured nuclear@26: * for each scan). nuclear@26: */ nuclear@26: unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ nuclear@26: int restart_in_rows; /* if > 0, MCU rows per restart interval */ nuclear@26: nuclear@26: /* Parameters controlling emission of special markers. */ nuclear@26: nuclear@26: boolean write_JFIF_header; /* should a JFIF marker be written? */ nuclear@26: UINT8 JFIF_major_version; /* What to write for the JFIF version number */ nuclear@26: UINT8 JFIF_minor_version; nuclear@26: /* These three values are not used by the JPEG code, merely copied */ nuclear@26: /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ nuclear@26: /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ nuclear@26: /* ratio is defined by X_density/Y_density even when density_unit=0. */ nuclear@26: UINT8 density_unit; /* JFIF code for pixel size units */ nuclear@26: UINT16 X_density; /* Horizontal pixel density */ nuclear@26: UINT16 Y_density; /* Vertical pixel density */ nuclear@26: boolean write_Adobe_marker; /* should an Adobe marker be written? */ nuclear@26: nuclear@26: /* State variable: index of next scanline to be written to nuclear@26: * jpeg_write_scanlines(). Application may use this to control its nuclear@26: * processing loop, e.g., "while (next_scanline < image_height)". nuclear@26: */ nuclear@26: nuclear@26: JDIMENSION next_scanline; /* 0 .. image_height-1 */ nuclear@26: nuclear@26: /* Remaining fields are known throughout compressor, but generally nuclear@26: * should not be touched by a surrounding application. nuclear@26: */ nuclear@26: nuclear@26: /* nuclear@26: * These fields are computed during compression startup nuclear@26: */ nuclear@26: boolean progressive_mode; /* TRUE if scan script uses progressive mode */ nuclear@26: int max_h_samp_factor; /* largest h_samp_factor */ nuclear@26: int max_v_samp_factor; /* largest v_samp_factor */ nuclear@26: nuclear@26: JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */ nuclear@26: /* The coefficient controller receives data in units of MCU rows as defined nuclear@26: * for fully interleaved scans (whether the JPEG file is interleaved or not). nuclear@26: * There are v_samp_factor * DCTSIZE sample rows of each component in an nuclear@26: * "iMCU" (interleaved MCU) row. nuclear@26: */ nuclear@26: nuclear@26: /* nuclear@26: * These fields are valid during any one scan. nuclear@26: * They describe the components and MCUs actually appearing in the scan. nuclear@26: */ nuclear@26: int comps_in_scan; /* # of JPEG components in this scan */ nuclear@26: jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; nuclear@26: /* *cur_comp_info[i] describes component that appears i'th in SOS */ nuclear@26: nuclear@26: JDIMENSION MCUs_per_row; /* # of MCUs across the image */ nuclear@26: JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ nuclear@26: nuclear@26: int blocks_in_MCU; /* # of DCT blocks per MCU */ nuclear@26: int MCU_membership[C_MAX_BLOCKS_IN_MCU]; nuclear@26: /* MCU_membership[i] is index in cur_comp_info of component owning */ nuclear@26: /* i'th block in an MCU */ nuclear@26: nuclear@26: int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ nuclear@26: nuclear@26: /* nuclear@26: * Links to compression subobjects (methods and private variables of modules) nuclear@26: */ nuclear@26: struct jpeg_comp_master * master; nuclear@26: struct jpeg_c_main_controller * main; nuclear@26: struct jpeg_c_prep_controller * prep; nuclear@26: struct jpeg_c_coef_controller * coef; nuclear@26: struct jpeg_marker_writer * marker; nuclear@26: struct jpeg_color_converter * cconvert; nuclear@26: struct jpeg_downsampler * downsample; nuclear@26: struct jpeg_forward_dct * fdct; nuclear@26: struct jpeg_entropy_encoder * entropy; nuclear@26: jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */ nuclear@26: int script_space_size; nuclear@26: }; nuclear@26: nuclear@26: nuclear@26: /* Master record for a decompression instance */ nuclear@26: nuclear@26: struct jpeg_decompress_struct { nuclear@26: jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ nuclear@26: nuclear@26: /* Source of compressed data */ nuclear@26: struct jpeg_source_mgr * src; nuclear@26: nuclear@26: /* Basic description of image --- filled in by jpeg_read_header(). */ nuclear@26: /* Application may inspect these values to decide how to process image. */ nuclear@26: nuclear@26: JDIMENSION image_width; /* nominal image width (from SOF marker) */ nuclear@26: JDIMENSION image_height; /* nominal image height */ nuclear@26: int num_components; /* # of color components in JPEG image */ nuclear@26: J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ nuclear@26: nuclear@26: /* Decompression processing parameters --- these fields must be set before nuclear@26: * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes nuclear@26: * them to default values. nuclear@26: */ nuclear@26: nuclear@26: J_COLOR_SPACE out_color_space; /* colorspace for output */ nuclear@26: nuclear@26: unsigned int scale_num, scale_denom; /* fraction by which to scale image */ nuclear@26: nuclear@26: double output_gamma; /* image gamma wanted in output */ nuclear@26: nuclear@26: boolean buffered_image; /* TRUE=multiple output passes */ nuclear@26: boolean raw_data_out; /* TRUE=downsampled data wanted */ nuclear@26: nuclear@26: J_DCT_METHOD dct_method; /* IDCT algorithm selector */ nuclear@26: boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ nuclear@26: boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ nuclear@26: nuclear@26: boolean quantize_colors; /* TRUE=colormapped output wanted */ nuclear@26: /* the following are ignored if not quantize_colors: */ nuclear@26: J_DITHER_MODE dither_mode; /* type of color dithering to use */ nuclear@26: boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ nuclear@26: int desired_number_of_colors; /* max # colors to use in created colormap */ nuclear@26: /* these are significant only in buffered-image mode: */ nuclear@26: boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ nuclear@26: boolean enable_external_quant;/* enable future use of external colormap */ nuclear@26: boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ nuclear@26: nuclear@26: /* Description of actual output image that will be returned to application. nuclear@26: * These fields are computed by jpeg_start_decompress(). nuclear@26: * You can also use jpeg_calc_output_dimensions() to determine these values nuclear@26: * in advance of calling jpeg_start_decompress(). nuclear@26: */ nuclear@26: nuclear@26: JDIMENSION output_width; /* scaled image width */ nuclear@26: JDIMENSION output_height; /* scaled image height */ nuclear@26: int out_color_components; /* # of color components in out_color_space */ nuclear@26: int output_components; /* # of color components returned */ nuclear@26: /* output_components is 1 (a colormap index) when quantizing colors; nuclear@26: * otherwise it equals out_color_components. nuclear@26: */ nuclear@26: int rec_outbuf_height; /* min recommended height of scanline buffer */ nuclear@26: /* If the buffer passed to jpeg_read_scanlines() is less than this many rows nuclear@26: * high, space and time will be wasted due to unnecessary data copying. nuclear@26: * Usually rec_outbuf_height will be 1 or 2, at most 4. nuclear@26: */ nuclear@26: nuclear@26: /* When quantizing colors, the output colormap is described by these fields. nuclear@26: * The application can supply a colormap by setting colormap non-NULL before nuclear@26: * calling jpeg_start_decompress; otherwise a colormap is created during nuclear@26: * jpeg_start_decompress or jpeg_start_output. nuclear@26: * The map has out_color_components rows and actual_number_of_colors columns. nuclear@26: */ nuclear@26: int actual_number_of_colors; /* number of entries in use */ nuclear@26: JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ nuclear@26: nuclear@26: /* State variables: these variables indicate the progress of decompression. nuclear@26: * The application may examine these but must not modify them. nuclear@26: */ nuclear@26: nuclear@26: /* Row index of next scanline to be read from jpeg_read_scanlines(). nuclear@26: * Application may use this to control its processing loop, e.g., nuclear@26: * "while (output_scanline < output_height)". nuclear@26: */ nuclear@26: JDIMENSION output_scanline; /* 0 .. output_height-1 */ nuclear@26: nuclear@26: /* Current input scan number and number of iMCU rows completed in scan. nuclear@26: * These indicate the progress of the decompressor input side. nuclear@26: */ nuclear@26: int input_scan_number; /* Number of SOS markers seen so far */ nuclear@26: JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */ nuclear@26: nuclear@26: /* The "output scan number" is the notional scan being displayed by the nuclear@26: * output side. The decompressor will not allow output scan/row number nuclear@26: * to get ahead of input scan/row, but it can fall arbitrarily far behind. nuclear@26: */ nuclear@26: int output_scan_number; /* Nominal scan number being displayed */ nuclear@26: JDIMENSION output_iMCU_row; /* Number of iMCU rows read */ nuclear@26: nuclear@26: /* Current progression status. coef_bits[c][i] indicates the precision nuclear@26: * with which component c's DCT coefficient i (in zigzag order) is known. nuclear@26: * It is -1 when no data has yet been received, otherwise it is the point nuclear@26: * transform (shift) value for the most recent scan of the coefficient nuclear@26: * (thus, 0 at completion of the progression). nuclear@26: * This pointer is NULL when reading a non-progressive file. nuclear@26: */ nuclear@26: int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */ nuclear@26: nuclear@26: /* Internal JPEG parameters --- the application usually need not look at nuclear@26: * these fields. Note that the decompressor output side may not use nuclear@26: * any parameters that can change between scans. nuclear@26: */ nuclear@26: nuclear@26: /* Quantization and Huffman tables are carried forward across input nuclear@26: * datastreams when processing abbreviated JPEG datastreams. nuclear@26: */ nuclear@26: nuclear@26: JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; nuclear@26: /* ptrs to coefficient quantization tables, or NULL if not defined */ nuclear@26: nuclear@26: JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; nuclear@26: JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; nuclear@26: /* ptrs to Huffman coding tables, or NULL if not defined */ nuclear@26: nuclear@26: /* These parameters are never carried across datastreams, since they nuclear@26: * are given in SOF/SOS markers or defined to be reset by SOI. nuclear@26: */ nuclear@26: nuclear@26: int data_precision; /* bits of precision in image data */ nuclear@26: nuclear@26: jpeg_component_info * comp_info; nuclear@26: /* comp_info[i] describes component that appears i'th in SOF */ nuclear@26: nuclear@26: boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */ nuclear@26: boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ nuclear@26: nuclear@26: UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ nuclear@26: UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ nuclear@26: UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ nuclear@26: nuclear@26: unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */ nuclear@26: nuclear@26: /* These fields record data obtained from optional markers recognized by nuclear@26: * the JPEG library. nuclear@26: */ nuclear@26: boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ nuclear@26: /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */ nuclear@26: UINT8 JFIF_major_version; /* JFIF version number */ nuclear@26: UINT8 JFIF_minor_version; nuclear@26: UINT8 density_unit; /* JFIF code for pixel size units */ nuclear@26: UINT16 X_density; /* Horizontal pixel density */ nuclear@26: UINT16 Y_density; /* Vertical pixel density */ nuclear@26: boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ nuclear@26: UINT8 Adobe_transform; /* Color transform code from Adobe marker */ nuclear@26: nuclear@26: boolean CCIR601_sampling; /* TRUE=first samples are cosited */ nuclear@26: nuclear@26: /* Aside from the specific data retained from APPn markers known to the nuclear@26: * library, the uninterpreted contents of any or all APPn and COM markers nuclear@26: * can be saved in a list for examination by the application. nuclear@26: */ nuclear@26: jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */ nuclear@26: nuclear@26: /* Remaining fields are known throughout decompressor, but generally nuclear@26: * should not be touched by a surrounding application. nuclear@26: */ nuclear@26: nuclear@26: /* nuclear@26: * These fields are computed during decompression startup nuclear@26: */ nuclear@26: int max_h_samp_factor; /* largest h_samp_factor */ nuclear@26: int max_v_samp_factor; /* largest v_samp_factor */ nuclear@26: nuclear@26: int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */ nuclear@26: nuclear@26: JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */ nuclear@26: /* The coefficient controller's input and output progress is measured in nuclear@26: * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows nuclear@26: * in fully interleaved JPEG scans, but are used whether the scan is nuclear@26: * interleaved or not. We define an iMCU row as v_samp_factor DCT block nuclear@26: * rows of each component. Therefore, the IDCT output contains nuclear@26: * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row. nuclear@26: */ nuclear@26: nuclear@26: JSAMPLE * sample_range_limit; /* table for fast range-limiting */ nuclear@26: nuclear@26: /* nuclear@26: * These fields are valid during any one scan. nuclear@26: * They describe the components and MCUs actually appearing in the scan. nuclear@26: * Note that the decompressor output side must not use these fields. nuclear@26: */ nuclear@26: int comps_in_scan; /* # of JPEG components in this scan */ nuclear@26: jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; nuclear@26: /* *cur_comp_info[i] describes component that appears i'th in SOS */ nuclear@26: nuclear@26: JDIMENSION MCUs_per_row; /* # of MCUs across the image */ nuclear@26: JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ nuclear@26: nuclear@26: int blocks_in_MCU; /* # of DCT blocks per MCU */ nuclear@26: int MCU_membership[D_MAX_BLOCKS_IN_MCU]; nuclear@26: /* MCU_membership[i] is index in cur_comp_info of component owning */ nuclear@26: /* i'th block in an MCU */ nuclear@26: nuclear@26: int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ nuclear@26: nuclear@26: /* This field is shared between entropy decoder and marker parser. nuclear@26: * It is either zero or the code of a JPEG marker that has been nuclear@26: * read from the data source, but has not yet been processed. nuclear@26: */ nuclear@26: int unread_marker; nuclear@26: nuclear@26: /* nuclear@26: * Links to decompression subobjects (methods, private variables of modules) nuclear@26: */ nuclear@26: struct jpeg_decomp_master * master; nuclear@26: struct jpeg_d_main_controller * main; nuclear@26: struct jpeg_d_coef_controller * coef; nuclear@26: struct jpeg_d_post_controller * post; nuclear@26: struct jpeg_input_controller * inputctl; nuclear@26: struct jpeg_marker_reader * marker; nuclear@26: struct jpeg_entropy_decoder * entropy; nuclear@26: struct jpeg_inverse_dct * idct; nuclear@26: struct jpeg_upsampler * upsample; nuclear@26: struct jpeg_color_deconverter * cconvert; nuclear@26: struct jpeg_color_quantizer * cquantize; nuclear@26: }; nuclear@26: nuclear@26: nuclear@26: /* "Object" declarations for JPEG modules that may be supplied or called nuclear@26: * directly by the surrounding application. nuclear@26: * As with all objects in the JPEG library, these structs only define the nuclear@26: * publicly visible methods and state variables of a module. Additional nuclear@26: * private fields may exist after the public ones. nuclear@26: */ nuclear@26: nuclear@26: nuclear@26: /* Error handler object */ nuclear@26: nuclear@26: struct jpeg_error_mgr { nuclear@26: /* Error exit handler: does not return to caller */ nuclear@26: JMETHOD(void, error_exit, (j_common_ptr cinfo)); nuclear@26: /* Conditionally emit a trace or warning message */ nuclear@26: JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level)); nuclear@26: /* Routine that actually outputs a trace or error message */ nuclear@26: JMETHOD(void, output_message, (j_common_ptr cinfo)); nuclear@26: /* Format a message string for the most recent JPEG error or message */ nuclear@26: JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer)); nuclear@26: #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */ nuclear@26: /* Reset error state variables at start of a new image */ nuclear@26: JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo)); nuclear@26: nuclear@26: /* The message ID code and any parameters are saved here. nuclear@26: * A message can have one string parameter or up to 8 int parameters. nuclear@26: */ nuclear@26: int msg_code; nuclear@26: #define JMSG_STR_PARM_MAX 80 nuclear@26: union { nuclear@26: int i[8]; nuclear@26: char s[JMSG_STR_PARM_MAX]; nuclear@26: } msg_parm; nuclear@26: nuclear@26: /* Standard state variables for error facility */ nuclear@26: nuclear@26: int trace_level; /* max msg_level that will be displayed */ nuclear@26: nuclear@26: /* For recoverable corrupt-data errors, we emit a warning message, nuclear@26: * but keep going unless emit_message chooses to abort. emit_message nuclear@26: * should count warnings in num_warnings. The surrounding application nuclear@26: * can check for bad data by seeing if num_warnings is nonzero at the nuclear@26: * end of processing. nuclear@26: */ nuclear@26: long num_warnings; /* number of corrupt-data warnings */ nuclear@26: nuclear@26: /* These fields point to the table(s) of error message strings. nuclear@26: * An application can change the table pointer to switch to a different nuclear@26: * message list (typically, to change the language in which errors are nuclear@26: * reported). Some applications may wish to add additional error codes nuclear@26: * that will be handled by the JPEG library error mechanism; the second nuclear@26: * table pointer is used for this purpose. nuclear@26: * nuclear@26: * First table includes all errors generated by JPEG library itself. nuclear@26: * Error code 0 is reserved for a "no such error string" message. nuclear@26: */ nuclear@26: const char * const * jpeg_message_table; /* Library errors */ nuclear@26: int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ nuclear@26: /* Second table can be added by application (see cjpeg/djpeg for example). nuclear@26: * It contains strings numbered first_addon_message..last_addon_message. nuclear@26: */ nuclear@26: const char * const * addon_message_table; /* Non-library errors */ nuclear@26: int first_addon_message; /* code for first string in addon table */ nuclear@26: int last_addon_message; /* code for last string in addon table */ nuclear@26: }; nuclear@26: nuclear@26: nuclear@26: /* Progress monitor object */ nuclear@26: nuclear@26: struct jpeg_progress_mgr { nuclear@26: JMETHOD(void, progress_monitor, (j_common_ptr cinfo)); nuclear@26: nuclear@26: long pass_counter; /* work units completed in this pass */ nuclear@26: long pass_limit; /* total number of work units in this pass */ nuclear@26: int completed_passes; /* passes completed so far */ nuclear@26: int total_passes; /* total number of passes expected */ nuclear@26: }; nuclear@26: nuclear@26: nuclear@26: /* Data destination object for compression */ nuclear@26: nuclear@26: struct jpeg_destination_mgr { nuclear@26: JOCTET * next_output_byte; /* => next byte to write in buffer */ nuclear@26: size_t free_in_buffer; /* # of byte spaces remaining in buffer */ nuclear@26: nuclear@26: JMETHOD(void, init_destination, (j_compress_ptr cinfo)); nuclear@26: JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo)); nuclear@26: JMETHOD(void, term_destination, (j_compress_ptr cinfo)); nuclear@26: }; nuclear@26: nuclear@26: nuclear@26: /* Data source object for decompression */ nuclear@26: nuclear@26: struct jpeg_source_mgr { nuclear@26: const JOCTET * next_input_byte; /* => next byte to read from buffer */ nuclear@26: size_t bytes_in_buffer; /* # of bytes remaining in buffer */ nuclear@26: nuclear@26: JMETHOD(void, init_source, (j_decompress_ptr cinfo)); nuclear@26: JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); nuclear@26: JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); nuclear@26: JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); nuclear@26: JMETHOD(void, term_source, (j_decompress_ptr cinfo)); nuclear@26: }; nuclear@26: nuclear@26: nuclear@26: /* Memory manager object. nuclear@26: * Allocates "small" objects (a few K total), "large" objects (tens of K), nuclear@26: * and "really big" objects (virtual arrays with backing store if needed). nuclear@26: * The memory manager does not allow individual objects to be freed; rather, nuclear@26: * each created object is assigned to a pool, and whole pools can be freed nuclear@26: * at once. This is faster and more convenient than remembering exactly what nuclear@26: * to free, especially where malloc()/free() are not too speedy. nuclear@26: * NB: alloc routines never return NULL. They exit to error_exit if not nuclear@26: * successful. nuclear@26: */ nuclear@26: nuclear@26: #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ nuclear@26: #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ nuclear@26: #define JPOOL_NUMPOOLS 2 nuclear@26: nuclear@26: typedef struct jvirt_sarray_control * jvirt_sarray_ptr; nuclear@26: typedef struct jvirt_barray_control * jvirt_barray_ptr; nuclear@26: nuclear@26: nuclear@26: struct jpeg_memory_mgr { nuclear@26: /* Method pointers */ nuclear@26: JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, nuclear@26: size_t sizeofobject)); nuclear@26: JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id, nuclear@26: size_t sizeofobject)); nuclear@26: JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, nuclear@26: JDIMENSION samplesperrow, nuclear@26: JDIMENSION numrows)); nuclear@26: JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, nuclear@26: JDIMENSION blocksperrow, nuclear@26: JDIMENSION numrows)); nuclear@26: JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo, nuclear@26: int pool_id, nuclear@26: boolean pre_zero, nuclear@26: JDIMENSION samplesperrow, nuclear@26: JDIMENSION numrows, nuclear@26: JDIMENSION maxaccess)); nuclear@26: JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo, nuclear@26: int pool_id, nuclear@26: boolean pre_zero, nuclear@26: JDIMENSION blocksperrow, nuclear@26: JDIMENSION numrows, nuclear@26: JDIMENSION maxaccess)); nuclear@26: JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo)); nuclear@26: JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo, nuclear@26: jvirt_sarray_ptr ptr, nuclear@26: JDIMENSION start_row, nuclear@26: JDIMENSION num_rows, nuclear@26: boolean writable)); nuclear@26: JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, nuclear@26: jvirt_barray_ptr ptr, nuclear@26: JDIMENSION start_row, nuclear@26: JDIMENSION num_rows, nuclear@26: boolean writable)); nuclear@26: JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id)); nuclear@26: JMETHOD(void, self_destruct, (j_common_ptr cinfo)); nuclear@26: nuclear@26: /* Limit on memory allocation for this JPEG object. (Note that this is nuclear@26: * merely advisory, not a guaranteed maximum; it only affects the space nuclear@26: * used for virtual-array buffers.) May be changed by outer application nuclear@26: * after creating the JPEG object. nuclear@26: */ nuclear@26: long max_memory_to_use; nuclear@26: nuclear@26: /* Maximum allocation request accepted by alloc_large. */ nuclear@26: long max_alloc_chunk; nuclear@26: }; nuclear@26: nuclear@26: nuclear@26: /* Routine signature for application-supplied marker processing methods. nuclear@26: * Need not pass marker code since it is stored in cinfo->unread_marker. nuclear@26: */ nuclear@26: typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); nuclear@26: nuclear@26: nuclear@26: /* Declarations for routines called by application. nuclear@26: * The JPP macro hides prototype parameters from compilers that can't cope. nuclear@26: * Note JPP requires double parentheses. nuclear@26: */ nuclear@26: nuclear@26: #ifdef HAVE_PROTOTYPES nuclear@26: #define JPP(arglist) arglist nuclear@26: #else nuclear@26: #define JPP(arglist) () nuclear@26: #endif nuclear@26: nuclear@26: nuclear@26: /* Short forms of external names for systems with brain-damaged linkers. nuclear@26: * We shorten external names to be unique in the first six letters, which nuclear@26: * is good enough for all known systems. nuclear@26: * (If your compiler itself needs names to be unique in less than 15 nuclear@26: * characters, you are out of luck. Get a better compiler.) nuclear@26: */ nuclear@26: nuclear@26: #ifdef NEED_SHORT_EXTERNAL_NAMES nuclear@26: #define jpeg_std_error jStdError nuclear@26: #define jpeg_CreateCompress jCreaCompress nuclear@26: #define jpeg_CreateDecompress jCreaDecompress nuclear@26: #define jpeg_destroy_compress jDestCompress nuclear@26: #define jpeg_destroy_decompress jDestDecompress nuclear@26: #define jpeg_stdio_dest jStdDest nuclear@26: #define jpeg_stdio_src jStdSrc nuclear@26: #define jpeg_set_defaults jSetDefaults nuclear@26: #define jpeg_set_colorspace jSetColorspace nuclear@26: #define jpeg_default_colorspace jDefColorspace nuclear@26: #define jpeg_set_quality jSetQuality nuclear@26: #define jpeg_set_linear_quality jSetLQuality nuclear@26: #define jpeg_add_quant_table jAddQuantTable nuclear@26: #define jpeg_quality_scaling jQualityScaling nuclear@26: #define jpeg_simple_progression jSimProgress nuclear@26: #define jpeg_suppress_tables jSuppressTables nuclear@26: #define jpeg_alloc_quant_table jAlcQTable nuclear@26: #define jpeg_alloc_huff_table jAlcHTable nuclear@26: #define jpeg_start_compress jStrtCompress nuclear@26: #define jpeg_write_scanlines jWrtScanlines nuclear@26: #define jpeg_finish_compress jFinCompress nuclear@26: #define jpeg_write_raw_data jWrtRawData nuclear@26: #define jpeg_write_marker jWrtMarker nuclear@26: #define jpeg_write_m_header jWrtMHeader nuclear@26: #define jpeg_write_m_byte jWrtMByte nuclear@26: #define jpeg_write_tables jWrtTables nuclear@26: #define jpeg_read_header jReadHeader nuclear@26: #define jpeg_start_decompress jStrtDecompress nuclear@26: #define jpeg_read_scanlines jReadScanlines nuclear@26: #define jpeg_finish_decompress jFinDecompress nuclear@26: #define jpeg_read_raw_data jReadRawData nuclear@26: #define jpeg_has_multiple_scans jHasMultScn nuclear@26: #define jpeg_start_output jStrtOutput nuclear@26: #define jpeg_finish_output jFinOutput nuclear@26: #define jpeg_input_complete jInComplete nuclear@26: #define jpeg_new_colormap jNewCMap nuclear@26: #define jpeg_consume_input jConsumeInput nuclear@26: #define jpeg_calc_output_dimensions jCalcDimensions nuclear@26: #define jpeg_save_markers jSaveMarkers nuclear@26: #define jpeg_set_marker_processor jSetMarker nuclear@26: #define jpeg_read_coefficients jReadCoefs nuclear@26: #define jpeg_write_coefficients jWrtCoefs nuclear@26: #define jpeg_copy_critical_parameters jCopyCrit nuclear@26: #define jpeg_abort_compress jAbrtCompress nuclear@26: #define jpeg_abort_decompress jAbrtDecompress nuclear@26: #define jpeg_abort jAbort nuclear@26: #define jpeg_destroy jDestroy nuclear@26: #define jpeg_resync_to_restart jResyncRestart nuclear@26: #endif /* NEED_SHORT_EXTERNAL_NAMES */ nuclear@26: nuclear@26: nuclear@26: /* Default error-management setup */ nuclear@26: EXTERN(struct jpeg_error_mgr *) jpeg_std_error nuclear@26: JPP((struct jpeg_error_mgr * err)); nuclear@26: nuclear@26: /* Initialization of JPEG compression objects. nuclear@26: * jpeg_create_compress() and jpeg_create_decompress() are the exported nuclear@26: * names that applications should call. These expand to calls on nuclear@26: * jpeg_CreateCompress and jpeg_CreateDecompress with additional information nuclear@26: * passed for version mismatch checking. nuclear@26: * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx. nuclear@26: */ nuclear@26: #define jpeg_create_compress(cinfo) \ nuclear@26: jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \ nuclear@26: (size_t) sizeof(struct jpeg_compress_struct)) nuclear@26: #define jpeg_create_decompress(cinfo) \ nuclear@26: jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \ nuclear@26: (size_t) sizeof(struct jpeg_decompress_struct)) nuclear@26: EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo, nuclear@26: int version, size_t structsize)); nuclear@26: EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo, nuclear@26: int version, size_t structsize)); nuclear@26: /* Destruction of JPEG compression objects */ nuclear@26: EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo)); nuclear@26: EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo)); nuclear@26: nuclear@26: /* Standard data source and destination managers: stdio streams. */ nuclear@26: /* Caller is responsible for opening the file before and closing after. */ nuclear@26: EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile)); nuclear@26: EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile)); nuclear@26: nuclear@26: /* Default parameter setup for compression */ nuclear@26: EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo)); nuclear@26: /* Compression parameter setup aids */ nuclear@26: EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo, nuclear@26: J_COLOR_SPACE colorspace)); nuclear@26: EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo)); nuclear@26: EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality, nuclear@26: boolean force_baseline)); nuclear@26: EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo, nuclear@26: int scale_factor, nuclear@26: boolean force_baseline)); nuclear@26: EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl, nuclear@26: const unsigned int *basic_table, nuclear@26: int scale_factor, nuclear@26: boolean force_baseline)); nuclear@26: EXTERN(int) jpeg_quality_scaling JPP((int quality)); nuclear@26: EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo)); nuclear@26: EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo, nuclear@26: boolean suppress)); nuclear@26: EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo)); nuclear@26: EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo)); nuclear@26: nuclear@26: /* Main entry points for compression */ nuclear@26: EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo, nuclear@26: boolean write_all_tables)); nuclear@26: EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo, nuclear@26: JSAMPARRAY scanlines, nuclear@26: JDIMENSION num_lines)); nuclear@26: EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo)); nuclear@26: nuclear@26: /* Replaces jpeg_write_scanlines when writing raw downsampled data. */ nuclear@26: EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo, nuclear@26: JSAMPIMAGE data, nuclear@26: JDIMENSION num_lines)); nuclear@26: nuclear@26: /* Write a special marker. See libjpeg.doc concerning safe usage. */ nuclear@26: EXTERN(void) jpeg_write_marker nuclear@26: JPP((j_compress_ptr cinfo, int marker, nuclear@26: const JOCTET * dataptr, unsigned int datalen)); nuclear@26: /* Same, but piecemeal. */ nuclear@26: EXTERN(void) jpeg_write_m_header nuclear@26: JPP((j_compress_ptr cinfo, int marker, unsigned int datalen)); nuclear@26: EXTERN(void) jpeg_write_m_byte nuclear@26: JPP((j_compress_ptr cinfo, int val)); nuclear@26: nuclear@26: /* Alternate compression function: just write an abbreviated table file */ nuclear@26: EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo)); nuclear@26: nuclear@26: /* Decompression startup: read start of JPEG datastream to see what's there */ nuclear@26: EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo, nuclear@26: boolean require_image)); nuclear@26: /* Return value is one of: */ nuclear@26: #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ nuclear@26: #define JPEG_HEADER_OK 1 /* Found valid image datastream */ nuclear@26: #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ nuclear@26: /* If you pass require_image = TRUE (normal case), you need not check for nuclear@26: * a TABLES_ONLY return code; an abbreviated file will cause an error exit. nuclear@26: * JPEG_SUSPENDED is only possible if you use a data source module that can nuclear@26: * give a suspension return (the stdio source module doesn't). nuclear@26: */ nuclear@26: nuclear@26: /* Main entry points for decompression */ nuclear@26: EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo)); nuclear@26: EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo, nuclear@26: JSAMPARRAY scanlines, nuclear@26: JDIMENSION max_lines)); nuclear@26: EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); nuclear@26: nuclear@26: /* Replaces jpeg_read_scanlines when reading raw downsampled data. */ nuclear@26: EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo, nuclear@26: JSAMPIMAGE data, nuclear@26: JDIMENSION max_lines)); nuclear@26: nuclear@26: /* Additional entry points for buffered-image mode. */ nuclear@26: EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo)); nuclear@26: EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo, nuclear@26: int scan_number)); nuclear@26: EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo)); nuclear@26: EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo)); nuclear@26: EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo)); nuclear@26: EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo)); nuclear@26: /* Return value is one of: */ nuclear@26: /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */ nuclear@26: #define JPEG_REACHED_SOS 1 /* Reached start of new scan */ nuclear@26: #define JPEG_REACHED_EOI 2 /* Reached end of image */ nuclear@26: #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ nuclear@26: #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ nuclear@26: nuclear@26: /* Precalculate output dimensions for current decompression parameters. */ nuclear@26: EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo)); nuclear@26: nuclear@26: /* Control saving of COM and APPn markers into marker_list. */ nuclear@26: EXTERN(void) jpeg_save_markers nuclear@26: JPP((j_decompress_ptr cinfo, int marker_code, nuclear@26: unsigned int length_limit)); nuclear@26: nuclear@26: /* Install a special processing method for COM or APPn markers. */ nuclear@26: EXTERN(void) jpeg_set_marker_processor nuclear@26: JPP((j_decompress_ptr cinfo, int marker_code, nuclear@26: jpeg_marker_parser_method routine)); nuclear@26: nuclear@26: /* Read or write raw DCT coefficients --- useful for lossless transcoding. */ nuclear@26: EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo)); nuclear@26: EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo, nuclear@26: jvirt_barray_ptr * coef_arrays)); nuclear@26: EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, nuclear@26: j_compress_ptr dstinfo)); nuclear@26: nuclear@26: /* If you choose to abort compression or decompression before completing nuclear@26: * jpeg_finish_(de)compress, then you need to clean up to release memory, nuclear@26: * temporary files, etc. You can just call jpeg_destroy_(de)compress nuclear@26: * if you're done with the JPEG object, but if you want to clean it up and nuclear@26: * reuse it, call this: nuclear@26: */ nuclear@26: EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo)); nuclear@26: EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo)); nuclear@26: nuclear@26: /* Generic versions of jpeg_abort and jpeg_destroy that work on either nuclear@26: * flavor of JPEG object. These may be more convenient in some places. nuclear@26: */ nuclear@26: EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo)); nuclear@26: EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo)); nuclear@26: nuclear@26: /* Default restart-marker-resync procedure for use by data source modules */ nuclear@26: EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, nuclear@26: int desired)); nuclear@26: nuclear@26: nuclear@26: /* These marker codes are exported since applications and data source modules nuclear@26: * are likely to want to use them. nuclear@26: */ nuclear@26: nuclear@26: #define JPEG_RST0 0xD0 /* RST0 marker code */ nuclear@26: #define JPEG_EOI 0xD9 /* EOI marker code */ nuclear@26: #define JPEG_APP0 0xE0 /* APP0 marker code */ nuclear@26: #define JPEG_COM 0xFE /* COM marker code */ nuclear@26: nuclear@26: nuclear@26: /* If we have a brain-damaged compiler that emits warnings (or worse, errors) nuclear@26: * for structure definitions that are never filled in, keep it quiet by nuclear@26: * supplying dummy definitions for the various substructures. nuclear@26: */ nuclear@26: nuclear@26: #ifdef INCOMPLETE_TYPES_BROKEN nuclear@26: #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */ nuclear@26: struct jvirt_sarray_control { long dummy; }; nuclear@26: struct jvirt_barray_control { long dummy; }; nuclear@26: struct jpeg_comp_master { long dummy; }; nuclear@26: struct jpeg_c_main_controller { long dummy; }; nuclear@26: struct jpeg_c_prep_controller { long dummy; }; nuclear@26: struct jpeg_c_coef_controller { long dummy; }; nuclear@26: struct jpeg_marker_writer { long dummy; }; nuclear@26: struct jpeg_color_converter { long dummy; }; nuclear@26: struct jpeg_downsampler { long dummy; }; nuclear@26: struct jpeg_forward_dct { long dummy; }; nuclear@26: struct jpeg_entropy_encoder { long dummy; }; nuclear@26: struct jpeg_decomp_master { long dummy; }; nuclear@26: struct jpeg_d_main_controller { long dummy; }; nuclear@26: struct jpeg_d_coef_controller { long dummy; }; nuclear@26: struct jpeg_d_post_controller { long dummy; }; nuclear@26: struct jpeg_input_controller { long dummy; }; nuclear@26: struct jpeg_marker_reader { long dummy; }; nuclear@26: struct jpeg_entropy_decoder { long dummy; }; nuclear@26: struct jpeg_inverse_dct { long dummy; }; nuclear@26: struct jpeg_upsampler { long dummy; }; nuclear@26: struct jpeg_color_deconverter { long dummy; }; nuclear@26: struct jpeg_color_quantizer { long dummy; }; nuclear@26: #endif /* JPEG_INTERNALS */ nuclear@26: #endif /* INCOMPLETE_TYPES_BROKEN */ nuclear@26: nuclear@26: nuclear@26: /* nuclear@26: * The JPEG library modules define JPEG_INTERNALS before including this file. nuclear@26: * The internal structure declarations are read only when that is true. nuclear@26: * Applications using the library should not include jpegint.h, but may wish nuclear@26: * to include jerror.h. nuclear@26: */ nuclear@26: nuclear@26: #ifdef JPEG_INTERNALS nuclear@26: #include "jpegint.h" /* fetch private declarations */ nuclear@26: #include "jerror.h" /* fetch error codes too */ nuclear@26: #endif nuclear@26: nuclear@26: #endif /* JPEGLIB_H */