michael@0: /* michael@0: * jpeglib.h michael@0: * michael@0: * This file was part of the Independent JPEG Group's software: michael@0: * Copyright (C) 1991-1998, Thomas G. Lane. michael@0: * Modified 2002-2009 by Guido Vollbeding. michael@0: * Modifications: michael@0: * Copyright (C) 2009-2011, 2013, D. R. Commander. michael@0: * For conditions of distribution and use, see the accompanying README file. michael@0: * michael@0: * This file defines the application interface for the JPEG library. michael@0: * Most applications using the library need only include this file, michael@0: * and perhaps jerror.h if they want to know the exact error codes. michael@0: */ michael@0: michael@0: #ifndef JPEGLIB_H michael@0: #define JPEGLIB_H michael@0: michael@0: /* michael@0: * First we include the configuration files that record how this michael@0: * installation of the JPEG library is set up. jconfig.h can be michael@0: * generated automatically for many systems. jmorecfg.h contains michael@0: * manual configuration options that most people need not worry about. michael@0: */ michael@0: michael@0: #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */ michael@0: #include "jconfig.h" /* widely used configuration options */ michael@0: #endif michael@0: #include "jmorecfg.h" /* seldom changed options */ michael@0: michael@0: michael@0: #ifdef __cplusplus michael@0: #ifndef DONT_USE_EXTERN_C michael@0: extern "C" { michael@0: #endif michael@0: #endif michael@0: michael@0: michael@0: /* Various constants determining the sizes of things. michael@0: * All of these are specified by the JPEG standard, so don't change them michael@0: * if you want to be compatible. michael@0: */ michael@0: michael@0: #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */ michael@0: #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */ michael@0: #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */ michael@0: #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */ michael@0: #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */ michael@0: #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */ michael@0: #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */ michael@0: /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard; michael@0: * the PostScript DCT filter can emit files with many more than 10 blocks/MCU. michael@0: * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU michael@0: * to handle it. We even let you do this from the jconfig.h file. However, michael@0: * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe michael@0: * sometimes emits noncompliant files doesn't mean you should too. michael@0: */ michael@0: #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */ michael@0: #ifndef D_MAX_BLOCKS_IN_MCU michael@0: #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */ michael@0: #endif michael@0: michael@0: michael@0: /* Data structures for images (arrays of samples and of DCT coefficients). michael@0: * On 80x86 machines, the image arrays are too big for near pointers, michael@0: * but the pointer arrays can fit in near memory. michael@0: */ michael@0: michael@0: typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */ michael@0: typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ michael@0: typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ michael@0: michael@0: typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ michael@0: typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */ michael@0: typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ michael@0: typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ michael@0: michael@0: typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */ michael@0: michael@0: michael@0: /* Types for JPEG compression parameters and working tables. */ michael@0: michael@0: michael@0: /* DCT coefficient quantization tables. */ michael@0: michael@0: typedef struct { michael@0: /* This array gives the coefficient quantizers in natural array order michael@0: * (not the zigzag order in which they are stored in a JPEG DQT marker). michael@0: * CAUTION: IJG versions prior to v6a kept this array in zigzag order. michael@0: */ michael@0: UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */ michael@0: /* This field is used only during compression. It's initialized FALSE when michael@0: * the table is created, and set TRUE when it's been output to the file. michael@0: * You could suppress output of a table by setting this to TRUE. michael@0: * (See jpeg_suppress_tables for an example.) michael@0: */ michael@0: boolean sent_table; /* TRUE when table has been output */ michael@0: } JQUANT_TBL; michael@0: michael@0: michael@0: /* Huffman coding tables. */ michael@0: michael@0: typedef struct { michael@0: /* These two fields directly represent the contents of a JPEG DHT marker */ michael@0: UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ michael@0: /* length k bits; bits[0] is unused */ michael@0: UINT8 huffval[256]; /* The symbols, in order of incr code length */ michael@0: /* This field is used only during compression. It's initialized FALSE when michael@0: * the table is created, and set TRUE when it's been output to the file. michael@0: * You could suppress output of a table by setting this to TRUE. michael@0: * (See jpeg_suppress_tables for an example.) michael@0: */ michael@0: boolean sent_table; /* TRUE when table has been output */ michael@0: } JHUFF_TBL; michael@0: michael@0: michael@0: /* Basic info about one component (color channel). */ michael@0: michael@0: typedef struct { michael@0: /* These values are fixed over the whole image. */ michael@0: /* For compression, they must be supplied by parameter setup; */ michael@0: /* for decompression, they are read from the SOF marker. */ michael@0: int component_id; /* identifier for this component (0..255) */ michael@0: int component_index; /* its index in SOF or cinfo->comp_info[] */ michael@0: int h_samp_factor; /* horizontal sampling factor (1..4) */ michael@0: int v_samp_factor; /* vertical sampling factor (1..4) */ michael@0: int quant_tbl_no; /* quantization table selector (0..3) */ michael@0: /* These values may vary between scans. */ michael@0: /* For compression, they must be supplied by parameter setup; */ michael@0: /* for decompression, they are read from the SOS marker. */ michael@0: /* The decompressor output side may not use these variables. */ michael@0: int dc_tbl_no; /* DC entropy table selector (0..3) */ michael@0: int ac_tbl_no; /* AC entropy table selector (0..3) */ michael@0: michael@0: /* Remaining fields should be treated as private by applications. */ michael@0: michael@0: /* These values are computed during compression or decompression startup: */ michael@0: /* Component's size in DCT blocks. michael@0: * Any dummy blocks added to complete an MCU are not counted; therefore michael@0: * these values do not depend on whether a scan is interleaved or not. michael@0: */ michael@0: JDIMENSION width_in_blocks; michael@0: JDIMENSION height_in_blocks; michael@0: /* Size of a DCT block in samples. Always DCTSIZE for compression. michael@0: * For decompression this is the size of the output from one DCT block, michael@0: * reflecting any scaling we choose to apply during the IDCT step. michael@0: * Values of 1,2,4,8 are likely to be supported. Note that different michael@0: * components may receive different IDCT scalings. michael@0: */ michael@0: #if JPEG_LIB_VERSION >= 70 michael@0: int DCT_h_scaled_size; michael@0: int DCT_v_scaled_size; michael@0: #else michael@0: int DCT_scaled_size; michael@0: #endif michael@0: /* The downsampled dimensions are the component's actual, unpadded number michael@0: * of samples at the main buffer (preprocessing/compression interface), thus michael@0: * downsampled_width = ceil(image_width * Hi/Hmax) michael@0: * and similarly for height. For decompression, IDCT scaling is included, so michael@0: * downsampled_width = ceil(image_width * Hi/Hmax * DCT_[h_]scaled_size/DCTSIZE) michael@0: */ michael@0: JDIMENSION downsampled_width; /* actual width in samples */ michael@0: JDIMENSION downsampled_height; /* actual height in samples */ michael@0: /* This flag is used only for decompression. In cases where some of the michael@0: * components will be ignored (eg grayscale output from YCbCr image), michael@0: * we can skip most computations for the unused components. michael@0: */ michael@0: boolean component_needed; /* do we need the value of this component? */ michael@0: michael@0: /* These values are computed before starting a scan of the component. */ michael@0: /* The decompressor output side may not use these variables. */ michael@0: int MCU_width; /* number of blocks per MCU, horizontally */ michael@0: int MCU_height; /* number of blocks per MCU, vertically */ michael@0: int MCU_blocks; /* MCU_width * MCU_height */ michael@0: int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_[h_]scaled_size */ michael@0: int last_col_width; /* # of non-dummy blocks across in last MCU */ michael@0: int last_row_height; /* # of non-dummy blocks down in last MCU */ michael@0: michael@0: /* Saved quantization table for component; NULL if none yet saved. michael@0: * See jdinput.c comments about the need for this information. michael@0: * This field is currently used only for decompression. michael@0: */ michael@0: JQUANT_TBL * quant_table; michael@0: michael@0: /* Private per-component storage for DCT or IDCT subsystem. */ michael@0: void * dct_table; michael@0: } jpeg_component_info; michael@0: michael@0: michael@0: /* The script for encoding a multiple-scan file is an array of these: */ michael@0: michael@0: typedef struct { michael@0: int comps_in_scan; /* number of components encoded in this scan */ michael@0: int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */ michael@0: int Ss, Se; /* progressive JPEG spectral selection parms */ michael@0: int Ah, Al; /* progressive JPEG successive approx. parms */ michael@0: } jpeg_scan_info; michael@0: michael@0: /* The decompressor can save APPn and COM markers in a list of these: */ michael@0: michael@0: typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr; michael@0: michael@0: struct jpeg_marker_struct { michael@0: jpeg_saved_marker_ptr next; /* next in list, or NULL */ michael@0: UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */ michael@0: unsigned int original_length; /* # bytes of data in the file */ michael@0: unsigned int data_length; /* # bytes of data saved at data[] */ michael@0: JOCTET FAR * data; /* the data contained in the marker */ michael@0: /* the marker length word is not counted in data_length or original_length */ michael@0: }; michael@0: michael@0: /* Known color spaces. */ michael@0: michael@0: #define JCS_EXTENSIONS 1 michael@0: #define JCS_ALPHA_EXTENSIONS 1 michael@0: michael@0: typedef enum { michael@0: JCS_UNKNOWN, /* error/unspecified */ michael@0: JCS_GRAYSCALE, /* monochrome */ michael@0: JCS_RGB, /* red/green/blue as specified by the RGB_RED, RGB_GREEN, michael@0: RGB_BLUE, and RGB_PIXELSIZE macros */ michael@0: JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ michael@0: JCS_CMYK, /* C/M/Y/K */ michael@0: JCS_YCCK, /* Y/Cb/Cr/K */ michael@0: JCS_EXT_RGB, /* red/green/blue */ michael@0: JCS_EXT_RGBX, /* red/green/blue/x */ michael@0: JCS_EXT_BGR, /* blue/green/red */ michael@0: JCS_EXT_BGRX, /* blue/green/red/x */ michael@0: JCS_EXT_XBGR, /* x/blue/green/red */ michael@0: JCS_EXT_XRGB, /* x/red/green/blue */ michael@0: /* When out_color_space it set to JCS_EXT_RGBX, JCS_EXT_BGRX, michael@0: JCS_EXT_XBGR, or JCS_EXT_XRGB during decompression, the X byte is michael@0: undefined, and in order to ensure the best performance, michael@0: libjpeg-turbo can set that byte to whatever value it wishes. Use michael@0: the following colorspace constants to ensure that the X byte is set michael@0: to 0xFF, so that it can be interpreted as an opaque alpha michael@0: channel. */ michael@0: JCS_EXT_RGBA, /* red/green/blue/alpha */ michael@0: JCS_EXT_BGRA, /* blue/green/red/alpha */ michael@0: JCS_EXT_ABGR, /* alpha/blue/green/red */ michael@0: JCS_EXT_ARGB /* alpha/red/green/blue */ michael@0: } J_COLOR_SPACE; michael@0: michael@0: /* DCT/IDCT algorithm options. */ michael@0: michael@0: typedef enum { michael@0: JDCT_ISLOW, /* slow but accurate integer algorithm */ michael@0: JDCT_IFAST, /* faster, less accurate integer method */ michael@0: JDCT_FLOAT /* floating-point: accurate, fast on fast HW */ michael@0: } J_DCT_METHOD; michael@0: michael@0: #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */ michael@0: #define JDCT_DEFAULT JDCT_ISLOW michael@0: #endif michael@0: #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */ michael@0: #define JDCT_FASTEST JDCT_IFAST michael@0: #endif michael@0: michael@0: /* Dithering options for decompression. */ michael@0: michael@0: typedef enum { michael@0: JDITHER_NONE, /* no dithering */ michael@0: JDITHER_ORDERED, /* simple ordered dither */ michael@0: JDITHER_FS /* Floyd-Steinberg error diffusion dither */ michael@0: } J_DITHER_MODE; michael@0: michael@0: michael@0: /* Common fields between JPEG compression and decompression master structs. */ michael@0: michael@0: #define jpeg_common_fields \ michael@0: struct jpeg_error_mgr * err; /* Error handler module */\ michael@0: struct jpeg_memory_mgr * mem; /* Memory manager module */\ michael@0: struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\ michael@0: void * client_data; /* Available for use by application */\ michael@0: boolean is_decompressor; /* So common code can tell which is which */\ michael@0: int global_state /* For checking call sequence validity */ michael@0: michael@0: /* Routines that are to be used by both halves of the library are declared michael@0: * to receive a pointer to this structure. There are no actual instances of michael@0: * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct. michael@0: */ michael@0: struct jpeg_common_struct { michael@0: jpeg_common_fields; /* Fields common to both master struct types */ michael@0: /* Additional fields follow in an actual jpeg_compress_struct or michael@0: * jpeg_decompress_struct. All three structs must agree on these michael@0: * initial fields! (This would be a lot cleaner in C++.) michael@0: */ michael@0: }; michael@0: michael@0: typedef struct jpeg_common_struct * j_common_ptr; michael@0: typedef struct jpeg_compress_struct * j_compress_ptr; michael@0: typedef struct jpeg_decompress_struct * j_decompress_ptr; michael@0: michael@0: michael@0: /* Master record for a compression instance */ michael@0: michael@0: struct jpeg_compress_struct { michael@0: jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */ michael@0: michael@0: /* Destination for compressed data */ michael@0: struct jpeg_destination_mgr * dest; michael@0: michael@0: /* Description of source image --- these fields must be filled in by michael@0: * outer application before starting compression. in_color_space must michael@0: * be correct before you can even call jpeg_set_defaults(). michael@0: */ michael@0: michael@0: JDIMENSION image_width; /* input image width */ michael@0: JDIMENSION image_height; /* input image height */ michael@0: int input_components; /* # of color components in input image */ michael@0: J_COLOR_SPACE in_color_space; /* colorspace of input image */ michael@0: michael@0: double input_gamma; /* image gamma of input image */ michael@0: michael@0: /* Compression parameters --- these fields must be set before calling michael@0: * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to michael@0: * initialize everything to reasonable defaults, then changing anything michael@0: * the application specifically wants to change. That way you won't get michael@0: * burnt when new parameters are added. Also note that there are several michael@0: * helper routines to simplify changing parameters. michael@0: */ michael@0: michael@0: #if JPEG_LIB_VERSION >= 70 michael@0: unsigned int scale_num, scale_denom; /* fraction by which to scale image */ michael@0: michael@0: JDIMENSION jpeg_width; /* scaled JPEG image width */ michael@0: JDIMENSION jpeg_height; /* scaled JPEG image height */ michael@0: /* Dimensions of actual JPEG image that will be written to file, michael@0: * derived from input dimensions by scaling factors above. michael@0: * These fields are computed by jpeg_start_compress(). michael@0: * You can also use jpeg_calc_jpeg_dimensions() to determine these values michael@0: * in advance of calling jpeg_start_compress(). michael@0: */ michael@0: #endif michael@0: michael@0: int data_precision; /* bits of precision in image data */ michael@0: michael@0: int num_components; /* # of color components in JPEG image */ michael@0: J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ michael@0: michael@0: jpeg_component_info * comp_info; michael@0: /* comp_info[i] describes component that appears i'th in SOF */ michael@0: michael@0: JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; michael@0: #if JPEG_LIB_VERSION >= 70 michael@0: int q_scale_factor[NUM_QUANT_TBLS]; michael@0: #endif michael@0: /* ptrs to coefficient quantization tables, or NULL if not defined, michael@0: * and corresponding scale factors (percentage, initialized 100). michael@0: */ michael@0: michael@0: JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; michael@0: JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; michael@0: /* ptrs to Huffman coding tables, or NULL if not defined */ michael@0: michael@0: UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ michael@0: UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ michael@0: UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ michael@0: michael@0: int num_scans; /* # of entries in scan_info array */ michael@0: const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ michael@0: /* The default value of scan_info is NULL, which causes a single-scan michael@0: * sequential JPEG file to be emitted. To create a multi-scan file, michael@0: * set num_scans and scan_info to point to an array of scan definitions. michael@0: */ michael@0: michael@0: boolean raw_data_in; /* TRUE=caller supplies downsampled data */ michael@0: boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ michael@0: boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ michael@0: boolean CCIR601_sampling; /* TRUE=first samples are cosited */ michael@0: #if JPEG_LIB_VERSION >= 70 michael@0: boolean do_fancy_downsampling; /* TRUE=apply fancy downsampling */ michael@0: #endif michael@0: int smoothing_factor; /* 1..100, or 0 for no input smoothing */ michael@0: J_DCT_METHOD dct_method; /* DCT algorithm selector */ michael@0: michael@0: /* The restart interval can be specified in absolute MCUs by setting michael@0: * restart_interval, or in MCU rows by setting restart_in_rows michael@0: * (in which case the correct restart_interval will be figured michael@0: * for each scan). michael@0: */ michael@0: unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ michael@0: int restart_in_rows; /* if > 0, MCU rows per restart interval */ michael@0: michael@0: /* Parameters controlling emission of special markers. */ michael@0: michael@0: boolean write_JFIF_header; /* should a JFIF marker be written? */ michael@0: UINT8 JFIF_major_version; /* What to write for the JFIF version number */ michael@0: UINT8 JFIF_minor_version; michael@0: /* These three values are not used by the JPEG code, merely copied */ michael@0: /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ michael@0: /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ michael@0: /* ratio is defined by X_density/Y_density even when density_unit=0. */ michael@0: UINT8 density_unit; /* JFIF code for pixel size units */ michael@0: UINT16 X_density; /* Horizontal pixel density */ michael@0: UINT16 Y_density; /* Vertical pixel density */ michael@0: boolean write_Adobe_marker; /* should an Adobe marker be written? */ michael@0: michael@0: /* State variable: index of next scanline to be written to michael@0: * jpeg_write_scanlines(). Application may use this to control its michael@0: * processing loop, e.g., "while (next_scanline < image_height)". michael@0: */ michael@0: michael@0: JDIMENSION next_scanline; /* 0 .. image_height-1 */ michael@0: michael@0: /* Remaining fields are known throughout compressor, but generally michael@0: * should not be touched by a surrounding application. michael@0: */ michael@0: michael@0: /* michael@0: * These fields are computed during compression startup michael@0: */ michael@0: boolean progressive_mode; /* TRUE if scan script uses progressive mode */ michael@0: int max_h_samp_factor; /* largest h_samp_factor */ michael@0: int max_v_samp_factor; /* largest v_samp_factor */ michael@0: michael@0: #if JPEG_LIB_VERSION >= 70 michael@0: int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */ michael@0: int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */ michael@0: #endif michael@0: michael@0: JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */ michael@0: /* The coefficient controller receives data in units of MCU rows as defined michael@0: * for fully interleaved scans (whether the JPEG file is interleaved or not). michael@0: * There are v_samp_factor * DCTSIZE sample rows of each component in an michael@0: * "iMCU" (interleaved MCU) row. michael@0: */ michael@0: michael@0: /* michael@0: * These fields are valid during any one scan. michael@0: * They describe the components and MCUs actually appearing in the scan. michael@0: */ michael@0: int comps_in_scan; /* # of JPEG components in this scan */ michael@0: jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; michael@0: /* *cur_comp_info[i] describes component that appears i'th in SOS */ michael@0: michael@0: JDIMENSION MCUs_per_row; /* # of MCUs across the image */ michael@0: JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ michael@0: michael@0: int blocks_in_MCU; /* # of DCT blocks per MCU */ michael@0: int MCU_membership[C_MAX_BLOCKS_IN_MCU]; michael@0: /* MCU_membership[i] is index in cur_comp_info of component owning */ michael@0: /* i'th block in an MCU */ michael@0: michael@0: int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ michael@0: michael@0: #if JPEG_LIB_VERSION >= 80 michael@0: int block_size; /* the basic DCT block size: 1..16 */ michael@0: const int * natural_order; /* natural-order position array */ michael@0: int lim_Se; /* min( Se, DCTSIZE2-1 ) */ michael@0: #endif michael@0: michael@0: /* michael@0: * Links to compression subobjects (methods and private variables of modules) michael@0: */ michael@0: struct jpeg_comp_master * master; michael@0: struct jpeg_c_main_controller * main; michael@0: struct jpeg_c_prep_controller * prep; michael@0: struct jpeg_c_coef_controller * coef; michael@0: struct jpeg_marker_writer * marker; michael@0: struct jpeg_color_converter * cconvert; michael@0: struct jpeg_downsampler * downsample; michael@0: struct jpeg_forward_dct * fdct; michael@0: struct jpeg_entropy_encoder * entropy; michael@0: jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */ michael@0: int script_space_size; michael@0: }; michael@0: michael@0: michael@0: /* Master record for a decompression instance */ michael@0: michael@0: struct jpeg_decompress_struct { michael@0: jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ michael@0: michael@0: /* Source of compressed data */ michael@0: struct jpeg_source_mgr * src; michael@0: michael@0: /* Basic description of image --- filled in by jpeg_read_header(). */ michael@0: /* Application may inspect these values to decide how to process image. */ michael@0: michael@0: JDIMENSION image_width; /* nominal image width (from SOF marker) */ michael@0: JDIMENSION image_height; /* nominal image height */ michael@0: int num_components; /* # of color components in JPEG image */ michael@0: J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ michael@0: michael@0: /* Decompression processing parameters --- these fields must be set before michael@0: * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes michael@0: * them to default values. michael@0: */ michael@0: michael@0: J_COLOR_SPACE out_color_space; /* colorspace for output */ michael@0: michael@0: unsigned int scale_num, scale_denom; /* fraction by which to scale image */ michael@0: michael@0: double output_gamma; /* image gamma wanted in output */ michael@0: michael@0: boolean buffered_image; /* TRUE=multiple output passes */ michael@0: boolean raw_data_out; /* TRUE=downsampled data wanted */ michael@0: michael@0: J_DCT_METHOD dct_method; /* IDCT algorithm selector */ michael@0: boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ michael@0: boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ michael@0: michael@0: boolean quantize_colors; /* TRUE=colormapped output wanted */ michael@0: /* the following are ignored if not quantize_colors: */ michael@0: J_DITHER_MODE dither_mode; /* type of color dithering to use */ michael@0: boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ michael@0: int desired_number_of_colors; /* max # colors to use in created colormap */ michael@0: /* these are significant only in buffered-image mode: */ michael@0: boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ michael@0: boolean enable_external_quant;/* enable future use of external colormap */ michael@0: boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ michael@0: michael@0: /* Description of actual output image that will be returned to application. michael@0: * These fields are computed by jpeg_start_decompress(). michael@0: * You can also use jpeg_calc_output_dimensions() to determine these values michael@0: * in advance of calling jpeg_start_decompress(). michael@0: */ michael@0: michael@0: JDIMENSION output_width; /* scaled image width */ michael@0: JDIMENSION output_height; /* scaled image height */ michael@0: int out_color_components; /* # of color components in out_color_space */ michael@0: int output_components; /* # of color components returned */ michael@0: /* output_components is 1 (a colormap index) when quantizing colors; michael@0: * otherwise it equals out_color_components. michael@0: */ michael@0: int rec_outbuf_height; /* min recommended height of scanline buffer */ michael@0: /* If the buffer passed to jpeg_read_scanlines() is less than this many rows michael@0: * high, space and time will be wasted due to unnecessary data copying. michael@0: * Usually rec_outbuf_height will be 1 or 2, at most 4. michael@0: */ michael@0: michael@0: /* When quantizing colors, the output colormap is described by these fields. michael@0: * The application can supply a colormap by setting colormap non-NULL before michael@0: * calling jpeg_start_decompress; otherwise a colormap is created during michael@0: * jpeg_start_decompress or jpeg_start_output. michael@0: * The map has out_color_components rows and actual_number_of_colors columns. michael@0: */ michael@0: int actual_number_of_colors; /* number of entries in use */ michael@0: JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ michael@0: michael@0: /* State variables: these variables indicate the progress of decompression. michael@0: * The application may examine these but must not modify them. michael@0: */ michael@0: michael@0: /* Row index of next scanline to be read from jpeg_read_scanlines(). michael@0: * Application may use this to control its processing loop, e.g., michael@0: * "while (output_scanline < output_height)". michael@0: */ michael@0: JDIMENSION output_scanline; /* 0 .. output_height-1 */ michael@0: michael@0: /* Current input scan number and number of iMCU rows completed in scan. michael@0: * These indicate the progress of the decompressor input side. michael@0: */ michael@0: int input_scan_number; /* Number of SOS markers seen so far */ michael@0: JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */ michael@0: michael@0: /* The "output scan number" is the notional scan being displayed by the michael@0: * output side. The decompressor will not allow output scan/row number michael@0: * to get ahead of input scan/row, but it can fall arbitrarily far behind. michael@0: */ michael@0: int output_scan_number; /* Nominal scan number being displayed */ michael@0: JDIMENSION output_iMCU_row; /* Number of iMCU rows read */ michael@0: michael@0: /* Current progression status. coef_bits[c][i] indicates the precision michael@0: * with which component c's DCT coefficient i (in zigzag order) is known. michael@0: * It is -1 when no data has yet been received, otherwise it is the point michael@0: * transform (shift) value for the most recent scan of the coefficient michael@0: * (thus, 0 at completion of the progression). michael@0: * This pointer is NULL when reading a non-progressive file. michael@0: */ michael@0: int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */ michael@0: michael@0: /* Internal JPEG parameters --- the application usually need not look at michael@0: * these fields. Note that the decompressor output side may not use michael@0: * any parameters that can change between scans. michael@0: */ michael@0: michael@0: /* Quantization and Huffman tables are carried forward across input michael@0: * datastreams when processing abbreviated JPEG datastreams. michael@0: */ michael@0: michael@0: JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; michael@0: /* ptrs to coefficient quantization tables, or NULL if not defined */ michael@0: michael@0: JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; michael@0: JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; michael@0: /* ptrs to Huffman coding tables, or NULL if not defined */ michael@0: michael@0: /* These parameters are never carried across datastreams, since they michael@0: * are given in SOF/SOS markers or defined to be reset by SOI. michael@0: */ michael@0: michael@0: int data_precision; /* bits of precision in image data */ michael@0: michael@0: jpeg_component_info * comp_info; michael@0: /* comp_info[i] describes component that appears i'th in SOF */ michael@0: michael@0: #if JPEG_LIB_VERSION >= 80 michael@0: boolean is_baseline; /* TRUE if Baseline SOF0 encountered */ michael@0: #endif michael@0: boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */ michael@0: boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ michael@0: michael@0: UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ michael@0: UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ michael@0: UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ michael@0: michael@0: unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */ michael@0: michael@0: /* These fields record data obtained from optional markers recognized by michael@0: * the JPEG library. michael@0: */ michael@0: boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ michael@0: /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */ michael@0: UINT8 JFIF_major_version; /* JFIF version number */ michael@0: UINT8 JFIF_minor_version; michael@0: UINT8 density_unit; /* JFIF code for pixel size units */ michael@0: UINT16 X_density; /* Horizontal pixel density */ michael@0: UINT16 Y_density; /* Vertical pixel density */ michael@0: boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ michael@0: UINT8 Adobe_transform; /* Color transform code from Adobe marker */ michael@0: michael@0: boolean CCIR601_sampling; /* TRUE=first samples are cosited */ michael@0: michael@0: /* Aside from the specific data retained from APPn markers known to the michael@0: * library, the uninterpreted contents of any or all APPn and COM markers michael@0: * can be saved in a list for examination by the application. michael@0: */ michael@0: jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */ michael@0: michael@0: /* Remaining fields are known throughout decompressor, but generally michael@0: * should not be touched by a surrounding application. michael@0: */ michael@0: michael@0: /* michael@0: * These fields are computed during decompression startup michael@0: */ michael@0: int max_h_samp_factor; /* largest h_samp_factor */ michael@0: int max_v_samp_factor; /* largest v_samp_factor */ michael@0: michael@0: #if JPEG_LIB_VERSION >= 70 michael@0: int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */ michael@0: int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */ michael@0: #else michael@0: int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */ michael@0: #endif michael@0: michael@0: JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */ michael@0: /* The coefficient controller's input and output progress is measured in michael@0: * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows michael@0: * in fully interleaved JPEG scans, but are used whether the scan is michael@0: * interleaved or not. We define an iMCU row as v_samp_factor DCT block michael@0: * rows of each component. Therefore, the IDCT output contains michael@0: * v_samp_factor*DCT_[v_]scaled_size sample rows of a component per iMCU row. michael@0: */ michael@0: michael@0: JSAMPLE * sample_range_limit; /* table for fast range-limiting */ michael@0: michael@0: /* michael@0: * These fields are valid during any one scan. michael@0: * They describe the components and MCUs actually appearing in the scan. michael@0: * Note that the decompressor output side must not use these fields. michael@0: */ michael@0: int comps_in_scan; /* # of JPEG components in this scan */ michael@0: jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; michael@0: /* *cur_comp_info[i] describes component that appears i'th in SOS */ michael@0: michael@0: JDIMENSION MCUs_per_row; /* # of MCUs across the image */ michael@0: JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ michael@0: michael@0: int blocks_in_MCU; /* # of DCT blocks per MCU */ michael@0: int MCU_membership[D_MAX_BLOCKS_IN_MCU]; michael@0: /* MCU_membership[i] is index in cur_comp_info of component owning */ michael@0: /* i'th block in an MCU */ michael@0: michael@0: int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ michael@0: michael@0: #if JPEG_LIB_VERSION >= 80 michael@0: /* These fields are derived from Se of first SOS marker. michael@0: */ michael@0: int block_size; /* the basic DCT block size: 1..16 */ michael@0: const int * natural_order; /* natural-order position array for entropy decode */ michael@0: int lim_Se; /* min( Se, DCTSIZE2-1 ) for entropy decode */ michael@0: #endif michael@0: michael@0: /* This field is shared between entropy decoder and marker parser. michael@0: * It is either zero or the code of a JPEG marker that has been michael@0: * read from the data source, but has not yet been processed. michael@0: */ michael@0: int unread_marker; michael@0: michael@0: /* michael@0: * Links to decompression subobjects (methods, private variables of modules) michael@0: */ michael@0: struct jpeg_decomp_master * master; michael@0: struct jpeg_d_main_controller * main; michael@0: struct jpeg_d_coef_controller * coef; michael@0: struct jpeg_d_post_controller * post; michael@0: struct jpeg_input_controller * inputctl; michael@0: struct jpeg_marker_reader * marker; michael@0: struct jpeg_entropy_decoder * entropy; michael@0: struct jpeg_inverse_dct * idct; michael@0: struct jpeg_upsampler * upsample; michael@0: struct jpeg_color_deconverter * cconvert; michael@0: struct jpeg_color_quantizer * cquantize; michael@0: }; michael@0: michael@0: michael@0: /* "Object" declarations for JPEG modules that may be supplied or called michael@0: * directly by the surrounding application. michael@0: * As with all objects in the JPEG library, these structs only define the michael@0: * publicly visible methods and state variables of a module. Additional michael@0: * private fields may exist after the public ones. michael@0: */ michael@0: michael@0: michael@0: /* Error handler object */ michael@0: michael@0: struct jpeg_error_mgr { michael@0: /* Error exit handler: does not return to caller */ michael@0: JMETHOD(void, error_exit, (j_common_ptr cinfo)); michael@0: /* Conditionally emit a trace or warning message */ michael@0: JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level)); michael@0: /* Routine that actually outputs a trace or error message */ michael@0: JMETHOD(void, output_message, (j_common_ptr cinfo)); michael@0: /* Format a message string for the most recent JPEG error or message */ michael@0: JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer)); michael@0: #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */ michael@0: /* Reset error state variables at start of a new image */ michael@0: JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo)); michael@0: michael@0: /* The message ID code and any parameters are saved here. michael@0: * A message can have one string parameter or up to 8 int parameters. michael@0: */ michael@0: int msg_code; michael@0: #define JMSG_STR_PARM_MAX 80 michael@0: union { michael@0: int i[8]; michael@0: char s[JMSG_STR_PARM_MAX]; michael@0: } msg_parm; michael@0: michael@0: /* Standard state variables for error facility */ michael@0: michael@0: int trace_level; /* max msg_level that will be displayed */ michael@0: michael@0: /* For recoverable corrupt-data errors, we emit a warning message, michael@0: * but keep going unless emit_message chooses to abort. emit_message michael@0: * should count warnings in num_warnings. The surrounding application michael@0: * can check for bad data by seeing if num_warnings is nonzero at the michael@0: * end of processing. michael@0: */ michael@0: long num_warnings; /* number of corrupt-data warnings */ michael@0: michael@0: /* These fields point to the table(s) of error message strings. michael@0: * An application can change the table pointer to switch to a different michael@0: * message list (typically, to change the language in which errors are michael@0: * reported). Some applications may wish to add additional error codes michael@0: * that will be handled by the JPEG library error mechanism; the second michael@0: * table pointer is used for this purpose. michael@0: * michael@0: * First table includes all errors generated by JPEG library itself. michael@0: * Error code 0 is reserved for a "no such error string" message. michael@0: */ michael@0: const char * const * jpeg_message_table; /* Library errors */ michael@0: int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ michael@0: /* Second table can be added by application (see cjpeg/djpeg for example). michael@0: * It contains strings numbered first_addon_message..last_addon_message. michael@0: */ michael@0: const char * const * addon_message_table; /* Non-library errors */ michael@0: int first_addon_message; /* code for first string in addon table */ michael@0: int last_addon_message; /* code for last string in addon table */ michael@0: }; michael@0: michael@0: michael@0: /* Progress monitor object */ michael@0: michael@0: struct jpeg_progress_mgr { michael@0: JMETHOD(void, progress_monitor, (j_common_ptr cinfo)); michael@0: michael@0: long pass_counter; /* work units completed in this pass */ michael@0: long pass_limit; /* total number of work units in this pass */ michael@0: int completed_passes; /* passes completed so far */ michael@0: int total_passes; /* total number of passes expected */ michael@0: }; michael@0: michael@0: michael@0: /* Data destination object for compression */ michael@0: michael@0: struct jpeg_destination_mgr { michael@0: JOCTET * next_output_byte; /* => next byte to write in buffer */ michael@0: size_t free_in_buffer; /* # of byte spaces remaining in buffer */ michael@0: michael@0: JMETHOD(void, init_destination, (j_compress_ptr cinfo)); michael@0: JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo)); michael@0: JMETHOD(void, term_destination, (j_compress_ptr cinfo)); michael@0: }; michael@0: michael@0: michael@0: /* Data source object for decompression */ michael@0: michael@0: struct jpeg_source_mgr { michael@0: const JOCTET * next_input_byte; /* => next byte to read from buffer */ michael@0: size_t bytes_in_buffer; /* # of bytes remaining in buffer */ michael@0: michael@0: JMETHOD(void, init_source, (j_decompress_ptr cinfo)); michael@0: JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); michael@0: JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); michael@0: JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); michael@0: JMETHOD(void, term_source, (j_decompress_ptr cinfo)); michael@0: }; michael@0: michael@0: michael@0: /* Memory manager object. michael@0: * Allocates "small" objects (a few K total), "large" objects (tens of K), michael@0: * and "really big" objects (virtual arrays with backing store if needed). michael@0: * The memory manager does not allow individual objects to be freed; rather, michael@0: * each created object is assigned to a pool, and whole pools can be freed michael@0: * at once. This is faster and more convenient than remembering exactly what michael@0: * to free, especially where malloc()/free() are not too speedy. michael@0: * NB: alloc routines never return NULL. They exit to error_exit if not michael@0: * successful. michael@0: */ michael@0: michael@0: #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ michael@0: #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ michael@0: #define JPOOL_NUMPOOLS 2 michael@0: michael@0: typedef struct jvirt_sarray_control * jvirt_sarray_ptr; michael@0: typedef struct jvirt_barray_control * jvirt_barray_ptr; michael@0: michael@0: michael@0: struct jpeg_memory_mgr { michael@0: /* Method pointers */ michael@0: JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, michael@0: size_t sizeofobject)); michael@0: JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id, michael@0: size_t sizeofobject)); michael@0: JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, michael@0: JDIMENSION samplesperrow, michael@0: JDIMENSION numrows)); michael@0: JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, michael@0: JDIMENSION blocksperrow, michael@0: JDIMENSION numrows)); michael@0: JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo, michael@0: int pool_id, michael@0: boolean pre_zero, michael@0: JDIMENSION samplesperrow, michael@0: JDIMENSION numrows, michael@0: JDIMENSION maxaccess)); michael@0: JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo, michael@0: int pool_id, michael@0: boolean pre_zero, michael@0: JDIMENSION blocksperrow, michael@0: JDIMENSION numrows, michael@0: JDIMENSION maxaccess)); michael@0: JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo)); michael@0: JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo, michael@0: jvirt_sarray_ptr ptr, michael@0: JDIMENSION start_row, michael@0: JDIMENSION num_rows, michael@0: boolean writable)); michael@0: JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, michael@0: jvirt_barray_ptr ptr, michael@0: JDIMENSION start_row, michael@0: JDIMENSION num_rows, michael@0: boolean writable)); michael@0: JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id)); michael@0: JMETHOD(void, self_destruct, (j_common_ptr cinfo)); michael@0: michael@0: /* Limit on memory allocation for this JPEG object. (Note that this is michael@0: * merely advisory, not a guaranteed maximum; it only affects the space michael@0: * used for virtual-array buffers.) May be changed by outer application michael@0: * after creating the JPEG object. michael@0: */ michael@0: long max_memory_to_use; michael@0: michael@0: /* Maximum allocation request accepted by alloc_large. */ michael@0: long max_alloc_chunk; michael@0: }; michael@0: michael@0: michael@0: /* Routine signature for application-supplied marker processing methods. michael@0: * Need not pass marker code since it is stored in cinfo->unread_marker. michael@0: */ michael@0: typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); michael@0: michael@0: michael@0: /* Declarations for routines called by application. michael@0: * The JPP macro hides prototype parameters from compilers that can't cope. michael@0: * Note JPP requires double parentheses. michael@0: */ michael@0: michael@0: #ifdef HAVE_PROTOTYPES michael@0: #define JPP(arglist) arglist michael@0: #else michael@0: #define JPP(arglist) () michael@0: #endif michael@0: michael@0: michael@0: /* Short forms of external names for systems with brain-damaged linkers. michael@0: * We shorten external names to be unique in the first six letters, which michael@0: * is good enough for all known systems. michael@0: * (If your compiler itself needs names to be unique in less than 15 michael@0: * characters, you are out of luck. Get a better compiler.) michael@0: */ michael@0: michael@0: #ifdef NEED_SHORT_EXTERNAL_NAMES michael@0: #define jpeg_std_error jStdError michael@0: #define jpeg_CreateCompress jCreaCompress michael@0: #define jpeg_CreateDecompress jCreaDecompress michael@0: #define jpeg_destroy_compress jDestCompress michael@0: #define jpeg_destroy_decompress jDestDecompress michael@0: #define jpeg_stdio_dest jStdDest michael@0: #define jpeg_stdio_src jStdSrc michael@0: #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) michael@0: #define jpeg_mem_dest jMemDest michael@0: #define jpeg_mem_src jMemSrc michael@0: #endif michael@0: #define jpeg_set_defaults jSetDefaults michael@0: #define jpeg_set_colorspace jSetColorspace michael@0: #define jpeg_default_colorspace jDefColorspace michael@0: #define jpeg_set_quality jSetQuality michael@0: #define jpeg_set_linear_quality jSetLQuality michael@0: #if JPEG_LIB_VERSION >= 70 michael@0: #define jpeg_default_qtables jDefQTables michael@0: #endif michael@0: #define jpeg_add_quant_table jAddQuantTable michael@0: #define jpeg_quality_scaling jQualityScaling michael@0: #define jpeg_simple_progression jSimProgress michael@0: #define jpeg_suppress_tables jSuppressTables michael@0: #define jpeg_alloc_quant_table jAlcQTable michael@0: #define jpeg_alloc_huff_table jAlcHTable michael@0: #define jpeg_start_compress jStrtCompress michael@0: #define jpeg_write_scanlines jWrtScanlines michael@0: #define jpeg_finish_compress jFinCompress michael@0: #if JPEG_LIB_VERSION >= 70 michael@0: #define jpeg_calc_jpeg_dimensions jCjpegDimensions michael@0: #endif michael@0: #define jpeg_write_raw_data jWrtRawData michael@0: #define jpeg_write_marker jWrtMarker michael@0: #define jpeg_write_m_header jWrtMHeader michael@0: #define jpeg_write_m_byte jWrtMByte michael@0: #define jpeg_write_tables jWrtTables michael@0: #define jpeg_read_header jReadHeader michael@0: #define jpeg_start_decompress jStrtDecompress michael@0: #define jpeg_read_scanlines jReadScanlines michael@0: #define jpeg_finish_decompress jFinDecompress michael@0: #define jpeg_read_raw_data jReadRawData michael@0: #define jpeg_has_multiple_scans jHasMultScn michael@0: #define jpeg_start_output jStrtOutput michael@0: #define jpeg_finish_output jFinOutput michael@0: #define jpeg_input_complete jInComplete michael@0: #define jpeg_new_colormap jNewCMap michael@0: #define jpeg_consume_input jConsumeInput michael@0: #if JPEG_LIB_VERSION >= 80 michael@0: #define jpeg_core_output_dimensions jCoreDimensions michael@0: #endif michael@0: #define jpeg_calc_output_dimensions jCalcDimensions michael@0: #define jpeg_save_markers jSaveMarkers michael@0: #define jpeg_set_marker_processor jSetMarker michael@0: #define jpeg_read_coefficients jReadCoefs michael@0: #define jpeg_write_coefficients jWrtCoefs michael@0: #define jpeg_copy_critical_parameters jCopyCrit michael@0: #define jpeg_abort_compress jAbrtCompress michael@0: #define jpeg_abort_decompress jAbrtDecompress michael@0: #define jpeg_abort jAbort michael@0: #define jpeg_destroy jDestroy michael@0: #define jpeg_resync_to_restart jResyncRestart michael@0: #endif /* NEED_SHORT_EXTERNAL_NAMES */ michael@0: michael@0: michael@0: /* Default error-management setup */ michael@0: EXTERN(struct jpeg_error_mgr *) jpeg_std_error michael@0: JPP((struct jpeg_error_mgr * err)); michael@0: michael@0: /* Initialization of JPEG compression objects. michael@0: * jpeg_create_compress() and jpeg_create_decompress() are the exported michael@0: * names that applications should call. These expand to calls on michael@0: * jpeg_CreateCompress and jpeg_CreateDecompress with additional information michael@0: * passed for version mismatch checking. michael@0: * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx. michael@0: */ michael@0: #define jpeg_create_compress(cinfo) \ michael@0: jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \ michael@0: (size_t) sizeof(struct jpeg_compress_struct)) michael@0: #define jpeg_create_decompress(cinfo) \ michael@0: jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \ michael@0: (size_t) sizeof(struct jpeg_decompress_struct)) michael@0: EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo, michael@0: int version, size_t structsize)); michael@0: EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo, michael@0: int version, size_t structsize)); michael@0: /* Destruction of JPEG compression objects */ michael@0: EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo)); michael@0: EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo)); michael@0: michael@0: /* Standard data source and destination managers: stdio streams. */ michael@0: /* Caller is responsible for opening the file before and closing after. */ michael@0: EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile)); michael@0: EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile)); michael@0: michael@0: #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) michael@0: /* Data source and destination managers: memory buffers. */ michael@0: EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo, michael@0: unsigned char ** outbuffer, michael@0: unsigned long * outsize)); michael@0: EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo, michael@0: unsigned char * inbuffer, michael@0: unsigned long insize)); michael@0: #endif michael@0: michael@0: /* Default parameter setup for compression */ michael@0: EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo)); michael@0: /* Compression parameter setup aids */ michael@0: EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo, michael@0: J_COLOR_SPACE colorspace)); michael@0: EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo)); michael@0: EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality, michael@0: boolean force_baseline)); michael@0: EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo, michael@0: int scale_factor, michael@0: boolean force_baseline)); michael@0: #if JPEG_LIB_VERSION >= 70 michael@0: EXTERN(void) jpeg_default_qtables JPP((j_compress_ptr cinfo, michael@0: boolean force_baseline)); michael@0: #endif michael@0: EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl, michael@0: const unsigned int *basic_table, michael@0: int scale_factor, michael@0: boolean force_baseline)); michael@0: EXTERN(int) jpeg_quality_scaling JPP((int quality)); michael@0: EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo)); michael@0: EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo, michael@0: boolean suppress)); michael@0: EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo)); michael@0: EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo)); michael@0: michael@0: /* Main entry points for compression */ michael@0: EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo, michael@0: boolean write_all_tables)); michael@0: EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo, michael@0: JSAMPARRAY scanlines, michael@0: JDIMENSION num_lines)); michael@0: EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo)); michael@0: michael@0: #if JPEG_LIB_VERSION >= 70 michael@0: /* Precalculate JPEG dimensions for current compression parameters. */ michael@0: EXTERN(void) jpeg_calc_jpeg_dimensions JPP((j_compress_ptr cinfo)); michael@0: #endif michael@0: michael@0: /* Replaces jpeg_write_scanlines when writing raw downsampled data. */ michael@0: EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo, michael@0: JSAMPIMAGE data, michael@0: JDIMENSION num_lines)); michael@0: michael@0: /* Write a special marker. See libjpeg.txt concerning safe usage. */ michael@0: EXTERN(void) jpeg_write_marker michael@0: JPP((j_compress_ptr cinfo, int marker, michael@0: const JOCTET * dataptr, unsigned int datalen)); michael@0: /* Same, but piecemeal. */ michael@0: EXTERN(void) jpeg_write_m_header michael@0: JPP((j_compress_ptr cinfo, int marker, unsigned int datalen)); michael@0: EXTERN(void) jpeg_write_m_byte michael@0: JPP((j_compress_ptr cinfo, int val)); michael@0: michael@0: /* Alternate compression function: just write an abbreviated table file */ michael@0: EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo)); michael@0: michael@0: /* Decompression startup: read start of JPEG datastream to see what's there */ michael@0: EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo, michael@0: boolean require_image)); michael@0: /* Return value is one of: */ michael@0: #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ michael@0: #define JPEG_HEADER_OK 1 /* Found valid image datastream */ michael@0: #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ michael@0: /* If you pass require_image = TRUE (normal case), you need not check for michael@0: * a TABLES_ONLY return code; an abbreviated file will cause an error exit. michael@0: * JPEG_SUSPENDED is only possible if you use a data source module that can michael@0: * give a suspension return (the stdio source module doesn't). michael@0: */ michael@0: michael@0: /* Main entry points for decompression */ michael@0: EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo)); michael@0: EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo, michael@0: JSAMPARRAY scanlines, michael@0: JDIMENSION max_lines)); michael@0: EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); michael@0: michael@0: /* Replaces jpeg_read_scanlines when reading raw downsampled data. */ michael@0: EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo, michael@0: JSAMPIMAGE data, michael@0: JDIMENSION max_lines)); michael@0: michael@0: /* Additional entry points for buffered-image mode. */ michael@0: EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo)); michael@0: EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo, michael@0: int scan_number)); michael@0: EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo)); michael@0: EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo)); michael@0: EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo)); michael@0: EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo)); michael@0: /* Return value is one of: */ michael@0: /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */ michael@0: #define JPEG_REACHED_SOS 1 /* Reached start of new scan */ michael@0: #define JPEG_REACHED_EOI 2 /* Reached end of image */ michael@0: #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ michael@0: #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ michael@0: michael@0: /* Precalculate output dimensions for current decompression parameters. */ michael@0: #if JPEG_LIB_VERSION >= 80 michael@0: EXTERN(void) jpeg_core_output_dimensions JPP((j_decompress_ptr cinfo)); michael@0: #endif michael@0: EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo)); michael@0: michael@0: /* Control saving of COM and APPn markers into marker_list. */ michael@0: EXTERN(void) jpeg_save_markers michael@0: JPP((j_decompress_ptr cinfo, int marker_code, michael@0: unsigned int length_limit)); michael@0: michael@0: /* Install a special processing method for COM or APPn markers. */ michael@0: EXTERN(void) jpeg_set_marker_processor michael@0: JPP((j_decompress_ptr cinfo, int marker_code, michael@0: jpeg_marker_parser_method routine)); michael@0: michael@0: /* Read or write raw DCT coefficients --- useful for lossless transcoding. */ michael@0: EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo)); michael@0: EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo, michael@0: jvirt_barray_ptr * coef_arrays)); michael@0: EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, michael@0: j_compress_ptr dstinfo)); michael@0: michael@0: /* If you choose to abort compression or decompression before completing michael@0: * jpeg_finish_(de)compress, then you need to clean up to release memory, michael@0: * temporary files, etc. You can just call jpeg_destroy_(de)compress michael@0: * if you're done with the JPEG object, but if you want to clean it up and michael@0: * reuse it, call this: michael@0: */ michael@0: EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo)); michael@0: EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo)); michael@0: michael@0: /* Generic versions of jpeg_abort and jpeg_destroy that work on either michael@0: * flavor of JPEG object. These may be more convenient in some places. michael@0: */ michael@0: EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo)); michael@0: EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo)); michael@0: michael@0: /* Default restart-marker-resync procedure for use by data source modules */ michael@0: EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, michael@0: int desired)); michael@0: michael@0: michael@0: /* These marker codes are exported since applications and data source modules michael@0: * are likely to want to use them. michael@0: */ michael@0: michael@0: #define JPEG_RST0 0xD0 /* RST0 marker code */ michael@0: #define JPEG_EOI 0xD9 /* EOI marker code */ michael@0: #define JPEG_APP0 0xE0 /* APP0 marker code */ michael@0: #define JPEG_COM 0xFE /* COM marker code */ michael@0: michael@0: michael@0: /* If we have a brain-damaged compiler that emits warnings (or worse, errors) michael@0: * for structure definitions that are never filled in, keep it quiet by michael@0: * supplying dummy definitions for the various substructures. michael@0: */ michael@0: michael@0: #ifdef INCOMPLETE_TYPES_BROKEN michael@0: #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */ michael@0: struct jvirt_sarray_control { long dummy; }; michael@0: struct jvirt_barray_control { long dummy; }; michael@0: struct jpeg_comp_master { long dummy; }; michael@0: struct jpeg_c_main_controller { long dummy; }; michael@0: struct jpeg_c_prep_controller { long dummy; }; michael@0: struct jpeg_c_coef_controller { long dummy; }; michael@0: struct jpeg_marker_writer { long dummy; }; michael@0: struct jpeg_color_converter { long dummy; }; michael@0: struct jpeg_downsampler { long dummy; }; michael@0: struct jpeg_forward_dct { long dummy; }; michael@0: struct jpeg_entropy_encoder { long dummy; }; michael@0: struct jpeg_decomp_master { long dummy; }; michael@0: struct jpeg_d_main_controller { long dummy; }; michael@0: struct jpeg_d_coef_controller { long dummy; }; michael@0: struct jpeg_d_post_controller { long dummy; }; michael@0: struct jpeg_input_controller { long dummy; }; michael@0: struct jpeg_marker_reader { long dummy; }; michael@0: struct jpeg_entropy_decoder { long dummy; }; michael@0: struct jpeg_inverse_dct { long dummy; }; michael@0: struct jpeg_upsampler { long dummy; }; michael@0: struct jpeg_color_deconverter { long dummy; }; michael@0: struct jpeg_color_quantizer { long dummy; }; michael@0: #endif /* JPEG_INTERNALS */ michael@0: #endif /* INCOMPLETE_TYPES_BROKEN */ michael@0: michael@0: michael@0: /* michael@0: * The JPEG library modules define JPEG_INTERNALS before including this file. michael@0: * The internal structure declarations are read only when that is true. michael@0: * Applications using the library should not include jpegint.h, but may wish michael@0: * to include jerror.h. michael@0: */ michael@0: michael@0: #ifdef JPEG_INTERNALS michael@0: #include "jpegint.h" /* fetch private declarations */ michael@0: #include "jerror.h" /* fetch error codes too */ michael@0: #endif michael@0: michael@0: #ifdef __cplusplus michael@0: #ifndef DONT_USE_EXTERN_C michael@0: } michael@0: #endif michael@0: #endif michael@0: michael@0: #endif /* JPEGLIB_H */