/* | |
* jpeglib.h | |
* | |
* Copyright (C) 1991-1998, Thomas G. Lane. | |
* This file is part of the Independent JPEG Group's software. | |
* For conditions of distribution and use, see the accompanying README file. | |
* | |
* This file defines the application interface for the JPEG library. | |
* Most applications using the library need only include this file, | |
* and perhaps jerror.h if they want to know the exact error codes. | |
*/ | |
#ifndef JPEGLIB_H | |
#define JPEGLIB_H | |
#define FOXIT_PREFIX(origName) FPDFAPIJPEG_##origName | |
#define jcopy_block_row FOXIT_PREFIX(jcopy_block_row) | |
#define jcopy_sample_rows FOXIT_PREFIX(jcopy_sample_rows) | |
#define jdiv_round_up FOXIT_PREFIX(jdiv_round_up) | |
#define jinit_1pass_quantizer FOXIT_PREFIX(jinit_1pass_quantizer) | |
#define jinit_2pass_quantizer FOXIT_PREFIX(jinit_2pass_quantizer) | |
#define jinit_color_deconverter FOXIT_PREFIX(jinit_color_deconverter) | |
#define jinit_d_coef_controller FOXIT_PREFIX(jinit_d_coef_controller) | |
#define jinit_d_main_controller FOXIT_PREFIX(jinit_d_main_controller) | |
#define jinit_d_post_controller FOXIT_PREFIX(jinit_d_post_controller) | |
#define jinit_huff_decoder FOXIT_PREFIX(jinit_huff_decoder) | |
#define jinit_input_controller FOXIT_PREFIX(jinit_input_controller) | |
#define jinit_inverse_dct FOXIT_PREFIX(jinit_inverse_dct) | |
#define jinit_marker_reader FOXIT_PREFIX(jinit_marker_reader) | |
#define jinit_master_decompress FOXIT_PREFIX(jinit_master_decompress) | |
#define jinit_memory_mgr FOXIT_PREFIX(jinit_memory_mgr) | |
#define jinit_merged_upsampler FOXIT_PREFIX(jinit_merged_upsampler) | |
#define jinit_phuff_decoder FOXIT_PREFIX(jinit_phuff_decoder) | |
#define jinit_upsampler FOXIT_PREFIX(jinit_upsampler) | |
#define jpeg_CreateDecompress FOXIT_PREFIX(jpeg_CreateDecompress) | |
#define jpeg_abort FOXIT_PREFIX(jpeg_abort) | |
#define jpeg_abort_decompress FOXIT_PREFIX(jpeg_abort_decompress) | |
#define jpeg_alloc_huff_table FOXIT_PREFIX(jpeg_alloc_huff_table) | |
#define jpeg_alloc_quant_table FOXIT_PREFIX(jpeg_alloc_quant_table) | |
#define jpeg_calc_output_dimensions FOXIT_PREFIX(jpeg_calc_output_dimensions) | |
#define jpeg_consume_input FOXIT_PREFIX(jpeg_consume_input) | |
#define jpeg_destroy FOXIT_PREFIX(jpeg_destroy) | |
#define jpeg_destroy_decompress FOXIT_PREFIX(jpeg_destroy_decompress) | |
#define jpeg_fill_bit_buffer FOXIT_PREFIX(jpeg_fill_bit_buffer) | |
#define jpeg_finish_decompress FOXIT_PREFIX(jpeg_finish_decompress) | |
#define jpeg_finish_output FOXIT_PREFIX(jpeg_finish_output) | |
#define jpeg_free_large FOXIT_PREFIX(jpeg_free_large) | |
#define jpeg_free_small FOXIT_PREFIX(jpeg_free_small) | |
#define jpeg_get_large FOXIT_PREFIX(jpeg_get_large) | |
#define jpeg_get_small FOXIT_PREFIX(jpeg_get_small) | |
#define jpeg_has_multiple_scans FOXIT_PREFIX(jpeg_has_multiple_scans) | |
#define jpeg_huff_decode FOXIT_PREFIX(jpeg_huff_decode) | |
#define jpeg_idct_1x1 FOXIT_PREFIX(jpeg_idct_1x1) | |
#define jpeg_idct_2x2 FOXIT_PREFIX(jpeg_idct_2x2) | |
#define jpeg_idct_4x4 FOXIT_PREFIX(jpeg_idct_4x4) | |
#define jpeg_idct_float FOXIT_PREFIX(jpeg_idct_float) | |
#define jpeg_idct_ifast FOXIT_PREFIX(jpeg_idct_ifast) | |
#define jpeg_idct_islow FOXIT_PREFIX(jpeg_idct_islow) | |
#define jpeg_input_complete FOXIT_PREFIX(jpeg_input_complete) | |
#define jpeg_make_d_derived_tbl FOXIT_PREFIX(jpeg_make_d_derived_tbl) | |
#define jpeg_mem_available FOXIT_PREFIX(jpeg_mem_available) | |
#define jpeg_mem_init FOXIT_PREFIX(jpeg_mem_init) | |
#define jpeg_mem_term FOXIT_PREFIX(jpeg_mem_term) | |
#define jpeg_natural_order FOXIT_PREFIX(jpeg_natural_order) | |
#define jpeg_new_colormap FOXIT_PREFIX(jpeg_new_colormap) | |
#define jpeg_open_backing_store FOXIT_PREFIX(jpeg_open_backing_store) | |
#define jpeg_read_coefficients FOXIT_PREFIX(jpeg_read_coefficients) | |
#define jpeg_read_header FOXIT_PREFIX(jpeg_read_header) | |
#define jpeg_read_raw_data FOXIT_PREFIX(jpeg_read_raw_data) | |
#define jpeg_read_scanlines FOXIT_PREFIX(jpeg_read_scanlines) | |
#define jpeg_resync_to_restart FOXIT_PREFIX(jpeg_resync_to_restart) | |
#define jpeg_save_markers FOXIT_PREFIX(jpeg_save_markers) | |
#define jpeg_set_marker_processor FOXIT_PREFIX(jpeg_set_marker_processor) | |
#define jpeg_start_decompress FOXIT_PREFIX(jpeg_start_decompress) | |
#define jpeg_start_output FOXIT_PREFIX(jpeg_start_output) | |
#define jpeg_std_error FOXIT_PREFIX(jpeg_std_error) | |
#define jpeg_std_message_table FOXIT_PREFIX(jpeg_std_message_table) | |
#define jpeg_stdio_src FOXIT_PREFIX(jpeg_stdio_src) | |
#define jround_up FOXIT_PREFIX(jround_up) | |
#define jzero_far FOXIT_PREFIX(jzero_far) | |
/* | |
* First we include the configuration files that record how this | |
* installation of the JPEG library is set up. jconfig.h can be | |
* generated automatically for many systems. jmorecfg.h contains | |
* manual configuration options that most people need not worry about. | |
*/ | |
#ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */ | |
#include "jconfig.h" /* widely used configuration options */ | |
#endif | |
#include "jmorecfg.h" /* seldom changed options */ | |
/* Version ID for the JPEG library. | |
* Might be useful for tests like "#if JPEG_LIB_VERSION >= 60". | |
*/ | |
#define JPEG_LIB_VERSION 62 /* Version 6b */ | |
/* Various constants determining the sizes of things. | |
* All of these are specified by the JPEG standard, so don't change them | |
* if you want to be compatible. | |
*/ | |
#define DCTSIZE 8 /* The basic DCT block is 8x8 samples */ | |
#define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */ | |
#define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */ | |
#define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */ | |
#define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */ | |
#define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */ | |
#define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */ | |
/* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard; | |
* the PostScript DCT filter can emit files with many more than 10 blocks/MCU. | |
* If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU | |
* to handle it. We even let you do this from the jconfig.h file. However, | |
* we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe | |
* sometimes emits noncompliant files doesn't mean you should too. | |
*/ | |
#define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */ | |
#ifndef D_MAX_BLOCKS_IN_MCU | |
#define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */ | |
#endif | |
/* Data structures for images (arrays of samples and of DCT coefficients). | |
* On 80x86 machines, the image arrays are too big for near pointers, | |
* but the pointer arrays can fit in near memory. | |
*/ | |
typedef JSAMPLE *JSAMPROW; /* ptr to one image row of pixel samples. */ | |
typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ | |
typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ | |
typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ | |
typedef JBLOCK *JBLOCKROW; /* pointer to one row of coefficient blocks */ | |
typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ | |
typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ | |
typedef JCOEF *JCOEFPTR; /* useful in a couple of places */ | |
/* Types for JPEG compression parameters and working tables. */ | |
/* DCT coefficient quantization tables. */ | |
typedef struct { | |
/* This array gives the coefficient quantizers in natural array order | |
* (not the zigzag order in which they are stored in a JPEG DQT marker). | |
* CAUTION: IJG versions prior to v6a kept this array in zigzag order. | |
*/ | |
UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */ | |
/* This field is used only during compression. It's initialized FALSE when | |
* the table is created, and set TRUE when it's been output to the file. | |
* You could suppress output of a table by setting this to TRUE. | |
* (See jpeg_suppress_tables for an example.) | |
*/ | |
boolean sent_table; /* TRUE when table has been output */ | |
} JQUANT_TBL; | |
/* Huffman coding tables. */ | |
typedef struct { | |
/* These two fields directly represent the contents of a JPEG DHT marker */ | |
UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ | |
/* length k bits; bits[0] is unused */ | |
UINT8 huffval[256]; /* The symbols, in order of incr code length */ | |
/* This field is used only during compression. It's initialized FALSE when | |
* the table is created, and set TRUE when it's been output to the file. | |
* You could suppress output of a table by setting this to TRUE. | |
* (See jpeg_suppress_tables for an example.) | |
*/ | |
boolean sent_table; /* TRUE when table has been output */ | |
} JHUFF_TBL; | |
/* Basic info about one component (color channel). */ | |
typedef struct { | |
/* These values are fixed over the whole image. */ | |
/* For compression, they must be supplied by parameter setup; */ | |
/* for decompression, they are read from the SOF marker. */ | |
int component_id; /* identifier for this component (0..255) */ | |
int component_index; /* its index in SOF or cinfo->comp_info[] */ | |
int h_samp_factor; /* horizontal sampling factor (1..4) */ | |
int v_samp_factor; /* vertical sampling factor (1..4) */ | |
int quant_tbl_no; /* quantization table selector (0..3) */ | |
/* These values may vary between scans. */ | |
/* For compression, they must be supplied by parameter setup; */ | |
/* for decompression, they are read from the SOS marker. */ | |
/* The decompressor output side may not use these variables. */ | |
int dc_tbl_no; /* DC entropy table selector (0..3) */ | |
int ac_tbl_no; /* AC entropy table selector (0..3) */ | |
/* Remaining fields should be treated as private by applications. */ | |
/* These values are computed during compression or decompression startup: */ | |
/* Component's size in DCT blocks. | |
* Any dummy blocks added to complete an MCU are not counted; therefore | |
* these values do not depend on whether a scan is interleaved or not. | |
*/ | |
JDIMENSION width_in_blocks; | |
JDIMENSION height_in_blocks; | |
/* Size of a DCT block in samples. Always DCTSIZE for compression. | |
* For decompression this is the size of the output from one DCT block, | |
* reflecting any scaling we choose to apply during the IDCT step. | |
* Values of 1,2,4,8 are likely to be supported. Note that different | |
* components may receive different IDCT scalings. | |
*/ | |
int DCT_scaled_size; | |
/* The downsampled dimensions are the component's actual, unpadded number | |
* of samples at the main buffer (preprocessing/compression interface), thus | |
* downsampled_width = ceil(image_width * Hi/Hmax) | |
* and similarly for height. For decompression, IDCT scaling is included, so | |
* downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE) | |
*/ | |
JDIMENSION downsampled_width; /* actual width in samples */ | |
JDIMENSION downsampled_height; /* actual height in samples */ | |
/* This flag is used only for decompression. In cases where some of the | |
* components will be ignored (eg grayscale output from YCbCr image), | |
* we can skip most computations for the unused components. | |
*/ | |
boolean component_needed; /* do we need the value of this component? */ | |
/* These values are computed before starting a scan of the component. */ | |
/* The decompressor output side may not use these variables. */ | |
int MCU_width; /* number of blocks per MCU, horizontally */ | |
int MCU_height; /* number of blocks per MCU, vertically */ | |
int MCU_blocks; /* MCU_width * MCU_height */ | |
int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */ | |
int last_col_width; /* # of non-dummy blocks across in last MCU */ | |
int last_row_height; /* # of non-dummy blocks down in last MCU */ | |
/* Saved quantization table for component; NULL if none yet saved. | |
* See jdinput.c comments about the need for this information. | |
* This field is currently used only for decompression. | |
*/ | |
JQUANT_TBL * quant_table; | |
/* Private per-component storage for DCT or IDCT subsystem. */ | |
void * dct_table; | |
} jpeg_component_info; | |
/* The script for encoding a multiple-scan file is an array of these: */ | |
typedef struct { | |
int comps_in_scan; /* number of components encoded in this scan */ | |
int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */ | |
int Ss, Se; /* progressive JPEG spectral selection parms */ | |
int Ah, Al; /* progressive JPEG successive approx. parms */ | |
} jpeg_scan_info; | |
/* The decompressor can save APPn and COM markers in a list of these: */ | |
typedef struct jpeg_marker_struct * jpeg_saved_marker_ptr; | |
struct jpeg_marker_struct { | |
jpeg_saved_marker_ptr next; /* next in list, or NULL */ | |
UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */ | |
unsigned int original_length; /* # bytes of data in the file */ | |
unsigned int data_length; /* # bytes of data saved at data[] */ | |
JOCTET * data; /* the data contained in the marker */ | |
/* the marker length word is not counted in data_length or original_length */ | |
}; | |
/* Known color spaces. */ | |
typedef enum { | |
JCS_UNKNOWN, /* error/unspecified */ | |
JCS_GRAYSCALE, /* monochrome */ | |
JCS_RGB, /* red/green/blue */ | |
JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ | |
JCS_CMYK, /* C/M/Y/K */ | |
JCS_YCCK /* Y/Cb/Cr/K */ | |
} J_COLOR_SPACE; | |
/* DCT/IDCT algorithm options. */ | |
typedef enum { | |
JDCT_ISLOW, /* slow but accurate integer algorithm */ | |
JDCT_IFAST, /* faster, less accurate integer method */ | |
JDCT_FLOAT /* floating-point: accurate, fast on fast HW */ | |
} J_DCT_METHOD; | |
#ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */ | |
#define JDCT_DEFAULT JDCT_ISLOW | |
#endif | |
#ifndef JDCT_FASTEST /* may be overridden in jconfig.h */ | |
#define JDCT_FASTEST JDCT_IFAST | |
#endif | |
/* Dithering options for decompression. */ | |
typedef enum { | |
JDITHER_NONE, /* no dithering */ | |
JDITHER_ORDERED, /* simple ordered dither */ | |
JDITHER_FS /* Floyd-Steinberg error diffusion dither */ | |
} J_DITHER_MODE; | |
/* Common fields between JPEG compression and decompression master structs. */ | |
#define jpeg_common_fields \ | |
struct jpeg_error_mgr * err; /* Error handler module */\ | |
struct jpeg_memory_mgr * mem; /* Memory manager module */\ | |
struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\ | |
void * client_data; /* Available for use by application */\ | |
boolean is_decompressor; /* So common code can tell which is which */\ | |
int global_state /* For checking call sequence validity */ | |
/* Routines that are to be used by both halves of the library are declared | |
* to receive a pointer to this structure. There are no actual instances of | |
* jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct. | |
*/ | |
struct jpeg_common_struct { | |
jpeg_common_fields; /* Fields common to both master struct types */ | |
/* Additional fields follow in an actual jpeg_compress_struct or | |
* jpeg_decompress_struct. All three structs must agree on these | |
* initial fields! (This would be a lot cleaner in C++.) | |
*/ | |
}; | |
typedef struct jpeg_common_struct * j_common_ptr; | |
typedef struct jpeg_compress_struct * j_compress_ptr; | |
typedef struct jpeg_decompress_struct * j_decompress_ptr; | |
/* Master record for a compression instance */ | |
struct jpeg_compress_struct { | |
jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */ | |
/* Destination for compressed data */ | |
struct jpeg_destination_mgr * dest; | |
/* Description of source image --- these fields must be filled in by | |
* outer application before starting compression. in_color_space must | |
* be correct before you can even call jpeg_set_defaults(). | |
*/ | |
JDIMENSION image_width; /* input image width */ | |
JDIMENSION image_height; /* input image height */ | |
int input_components; /* # of color components in input image */ | |
J_COLOR_SPACE in_color_space; /* colorspace of input image */ | |
double input_gamma; /* image gamma of input image */ | |
/* Compression parameters --- these fields must be set before calling | |
* jpeg_start_compress(). We recommend calling jpeg_set_defaults() to | |
* initialize everything to reasonable defaults, then changing anything | |
* the application specifically wants to change. That way you won't get | |
* burnt when new parameters are added. Also note that there are several | |
* helper routines to simplify changing parameters. | |
*/ | |
int data_precision; /* bits of precision in image data */ | |
int num_components; /* # of color components in JPEG image */ | |
J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ | |
jpeg_component_info * comp_info; | |
/* comp_info[i] describes component that appears i'th in SOF */ | |
JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; | |
/* ptrs to coefficient quantization tables, or NULL if not defined */ | |
JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; | |
JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; | |
/* ptrs to Huffman coding tables, or NULL if not defined */ | |
UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ | |
UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ | |
UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ | |
int num_scans; /* # of entries in scan_info array */ | |
const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ | |
/* The default value of scan_info is NULL, which causes a single-scan | |
* sequential JPEG file to be emitted. To create a multi-scan file, | |
* set num_scans and scan_info to point to an array of scan definitions. | |
*/ | |
boolean raw_data_in; /* TRUE=caller supplies downsampled data */ | |
boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ | |
boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ | |
boolean CCIR601_sampling; /* TRUE=first samples are cosited */ | |
int smoothing_factor; /* 1..100, or 0 for no input smoothing */ | |
J_DCT_METHOD dct_method; /* DCT algorithm selector */ | |
/* The restart interval can be specified in absolute MCUs by setting | |
* restart_interval, or in MCU rows by setting restart_in_rows | |
* (in which case the correct restart_interval will be figured | |
* for each scan). | |
*/ | |
unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ | |
int restart_in_rows; /* if > 0, MCU rows per restart interval */ | |
/* Parameters controlling emission of special markers. */ | |
boolean write_JFIF_header; /* should a JFIF marker be written? */ | |
UINT8 JFIF_major_version; /* What to write for the JFIF version number */ | |
UINT8 JFIF_minor_version; | |
/* These three values are not used by the JPEG code, merely copied */ | |
/* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ | |
/* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ | |
/* ratio is defined by X_density/Y_density even when density_unit=0. */ | |
UINT8 density_unit; /* JFIF code for pixel size units */ | |
UINT16 X_density; /* Horizontal pixel density */ | |
UINT16 Y_density; /* Vertical pixel density */ | |
boolean write_Adobe_marker; /* should an Adobe marker be written? */ | |
/* State variable: index of next scanline to be written to | |
* jpeg_write_scanlines(). Application may use this to control its | |
* processing loop, e.g., "while (next_scanline < image_height)". | |
*/ | |
JDIMENSION next_scanline; /* 0 .. image_height-1 */ | |
/* Remaining fields are known throughout compressor, but generally | |
* should not be touched by a surrounding application. | |
*/ | |
/* | |
* These fields are computed during compression startup | |
*/ | |
boolean progressive_mode; /* TRUE if scan script uses progressive mode */ | |
int max_h_samp_factor; /* largest h_samp_factor */ | |
int max_v_samp_factor; /* largest v_samp_factor */ | |
JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */ | |
/* The coefficient controller receives data in units of MCU rows as defined | |
* for fully interleaved scans (whether the JPEG file is interleaved or not). | |
* There are v_samp_factor * DCTSIZE sample rows of each component in an | |
* "iMCU" (interleaved MCU) row. | |
*/ | |
/* | |
* These fields are valid during any one scan. | |
* They describe the components and MCUs actually appearing in the scan. | |
*/ | |
int comps_in_scan; /* # of JPEG components in this scan */ | |
jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; | |
/* *cur_comp_info[i] describes component that appears i'th in SOS */ | |
JDIMENSION MCUs_per_row; /* # of MCUs across the image */ | |
JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ | |
int blocks_in_MCU; /* # of DCT blocks per MCU */ | |
int MCU_membership[C_MAX_BLOCKS_IN_MCU]; | |
/* MCU_membership[i] is index in cur_comp_info of component owning */ | |
/* i'th block in an MCU */ | |
int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ | |
/* | |
* Links to compression subobjects (methods and private variables of modules) | |
*/ | |
struct jpeg_comp_master * master; | |
struct jpeg_c_main_controller * main; | |
struct jpeg_c_prep_controller * prep; | |
struct jpeg_c_coef_controller * coef; | |
struct jpeg_marker_writer * marker; | |
struct jpeg_color_converter * cconvert; | |
struct jpeg_downsampler * downsample; | |
struct jpeg_forward_dct * fdct; | |
struct jpeg_entropy_encoder * entropy; | |
jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */ | |
int script_space_size; | |
}; | |
/* Master record for a decompression instance */ | |
struct jpeg_decompress_struct { | |
jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ | |
/* Source of compressed data */ | |
struct jpeg_source_mgr * src; | |
/* Basic description of image --- filled in by jpeg_read_header(). */ | |
/* Application may inspect these values to decide how to process image. */ | |
JDIMENSION image_width; /* nominal image width (from SOF marker) */ | |
JDIMENSION image_height; /* nominal image height */ | |
int num_components; /* # of color components in JPEG image */ | |
J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ | |
/* Decompression processing parameters --- these fields must be set before | |
* calling jpeg_start_decompress(). Note that jpeg_read_header() initializes | |
* them to default values. | |
*/ | |
J_COLOR_SPACE out_color_space; /* colorspace for output */ | |
unsigned int scale_num, scale_denom; /* fraction by which to scale image */ | |
double output_gamma; /* image gamma wanted in output */ | |
boolean buffered_image; /* TRUE=multiple output passes */ | |
boolean raw_data_out; /* TRUE=downsampled data wanted */ | |
J_DCT_METHOD dct_method; /* IDCT algorithm selector */ | |
boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ | |
boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ | |
boolean quantize_colors; /* TRUE=colormapped output wanted */ | |
/* the following are ignored if not quantize_colors: */ | |
J_DITHER_MODE dither_mode; /* type of color dithering to use */ | |
boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ | |
int desired_number_of_colors; /* max # colors to use in created colormap */ | |
/* these are significant only in buffered-image mode: */ | |
boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ | |
boolean enable_external_quant;/* enable future use of external colormap */ | |
boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ | |
/* Description of actual output image that will be returned to application. | |
* These fields are computed by jpeg_start_decompress(). | |
* You can also use jpeg_calc_output_dimensions() to determine these values | |
* in advance of calling jpeg_start_decompress(). | |
*/ | |
JDIMENSION output_width; /* scaled image width */ | |
JDIMENSION output_height; /* scaled image height */ | |
int out_color_components; /* # of color components in out_color_space */ | |
int output_components; /* # of color components returned */ | |
/* output_components is 1 (a colormap index) when quantizing colors; | |
* otherwise it equals out_color_components. | |
*/ | |
int rec_outbuf_height; /* min recommended height of scanline buffer */ | |
/* If the buffer passed to jpeg_read_scanlines() is less than this many rows | |
* high, space and time will be wasted due to unnecessary data copying. | |
* Usually rec_outbuf_height will be 1 or 2, at most 4. | |
*/ | |
/* When quantizing colors, the output colormap is described by these fields. | |
* The application can supply a colormap by setting colormap non-NULL before | |
* calling jpeg_start_decompress; otherwise a colormap is created during | |
* jpeg_start_decompress or jpeg_start_output. | |
* The map has out_color_components rows and actual_number_of_colors columns. | |
*/ | |
int actual_number_of_colors; /* number of entries in use */ | |
JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ | |
/* State variables: these variables indicate the progress of decompression. | |
* The application may examine these but must not modify them. | |
*/ | |
/* Row index of next scanline to be read from jpeg_read_scanlines(). | |
* Application may use this to control its processing loop, e.g., | |
* "while (output_scanline < output_height)". | |
*/ | |
JDIMENSION output_scanline; /* 0 .. output_height-1 */ | |
/* Current input scan number and number of iMCU rows completed in scan. | |
* These indicate the progress of the decompressor input side. | |
*/ | |
int input_scan_number; /* Number of SOS markers seen so far */ | |
JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */ | |
/* The "output scan number" is the notional scan being displayed by the | |
* output side. The decompressor will not allow output scan/row number | |
* to get ahead of input scan/row, but it can fall arbitrarily far behind. | |
*/ | |
int output_scan_number; /* Nominal scan number being displayed */ | |
JDIMENSION output_iMCU_row; /* Number of iMCU rows read */ | |
/* Current progression status. coef_bits[c][i] indicates the precision | |
* with which component c's DCT coefficient i (in zigzag order) is known. | |
* It is -1 when no data has yet been received, otherwise it is the point | |
* transform (shift) value for the most recent scan of the coefficient | |
* (thus, 0 at completion of the progression). | |
* This pointer is NULL when reading a non-progressive file. | |
*/ | |
int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */ | |
/* Internal JPEG parameters --- the application usually need not look at | |
* these fields. Note that the decompressor output side may not use | |
* any parameters that can change between scans. | |
*/ | |
/* Quantization and Huffman tables are carried forward across input | |
* datastreams when processing abbreviated JPEG datastreams. | |
*/ | |
JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; | |
/* ptrs to coefficient quantization tables, or NULL if not defined */ | |
JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; | |
JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; | |
/* ptrs to Huffman coding tables, or NULL if not defined */ | |
/* These parameters are never carried across datastreams, since they | |
* are given in SOF/SOS markers or defined to be reset by SOI. | |
*/ | |
int data_precision; /* bits of precision in image data */ | |
jpeg_component_info * comp_info; | |
/* comp_info[i] describes component that appears i'th in SOF */ | |
boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */ | |
boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ | |
UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ | |
UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ | |
UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ | |
unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */ | |
/* These fields record data obtained from optional markers recognized by | |
* the JPEG library. | |
*/ | |
boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ | |
/* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */ | |
UINT8 JFIF_major_version; /* JFIF version number */ | |
UINT8 JFIF_minor_version; | |
UINT8 density_unit; /* JFIF code for pixel size units */ | |
UINT16 X_density; /* Horizontal pixel density */ | |
UINT16 Y_density; /* Vertical pixel density */ | |
boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ | |
UINT8 Adobe_transform; /* Color transform code from Adobe marker */ | |
boolean CCIR601_sampling; /* TRUE=first samples are cosited */ | |
/* Aside from the specific data retained from APPn markers known to the | |
* library, the uninterpreted contents of any or all APPn and COM markers | |
* can be saved in a list for examination by the application. | |
*/ | |
jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */ | |
/* Remaining fields are known throughout decompressor, but generally | |
* should not be touched by a surrounding application. | |
*/ | |
/* | |
* These fields are computed during decompression startup | |
*/ | |
int max_h_samp_factor; /* largest h_samp_factor */ | |
int max_v_samp_factor; /* largest v_samp_factor */ | |
int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */ | |
JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */ | |
/* The coefficient controller's input and output progress is measured in | |
* units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows | |
* in fully interleaved JPEG scans, but are used whether the scan is | |
* interleaved or not. We define an iMCU row as v_samp_factor DCT block | |
* rows of each component. Therefore, the IDCT output contains | |
* v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row. | |
*/ | |
JSAMPLE * sample_range_limit; /* table for fast range-limiting */ | |
/* | |
* These fields are valid during any one scan. | |
* They describe the components and MCUs actually appearing in the scan. | |
* Note that the decompressor output side must not use these fields. | |
*/ | |
int comps_in_scan; /* # of JPEG components in this scan */ | |
jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; | |
/* *cur_comp_info[i] describes component that appears i'th in SOS */ | |
JDIMENSION MCUs_per_row; /* # of MCUs across the image */ | |
JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ | |
int blocks_in_MCU; /* # of DCT blocks per MCU */ | |
int MCU_membership[D_MAX_BLOCKS_IN_MCU]; | |
/* MCU_membership[i] is index in cur_comp_info of component owning */ | |
/* i'th block in an MCU */ | |
int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ | |
/* This field is shared between entropy decoder and marker parser. | |
* It is either zero or the code of a JPEG marker that has been | |
* read from the data source, but has not yet been processed. | |
*/ | |
int unread_marker; | |
/* | |
* Links to decompression subobjects (methods, private variables of modules) | |
*/ | |
struct jpeg_decomp_master * master; | |
struct jpeg_d_main_controller * main; | |
struct jpeg_d_coef_controller * coef; | |
struct jpeg_d_post_controller * post; | |
struct jpeg_input_controller * inputctl; | |
struct jpeg_marker_reader * marker; | |
struct jpeg_entropy_decoder * entropy; | |
struct jpeg_inverse_dct * idct; | |
struct jpeg_upsampler * upsample; | |
struct jpeg_color_deconverter * cconvert; | |
struct jpeg_color_quantizer * cquantize; | |
}; | |
/* "Object" declarations for JPEG modules that may be supplied or called | |
* directly by the surrounding application. | |
* As with all objects in the JPEG library, these structs only define the | |
* publicly visible methods and state variables of a module. Additional | |
* private fields may exist after the public ones. | |
*/ | |
/* Error handler object */ | |
struct jpeg_error_mgr { | |
/* Error exit handler: does not return to caller */ | |
JMETHOD(void, error_exit, (j_common_ptr cinfo)); | |
/* Conditionally emit a trace or warning message */ | |
JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level)); | |
/* Routine that actually outputs a trace or error message */ | |
JMETHOD(void, output_message, (j_common_ptr cinfo)); | |
/* Format a message string for the most recent JPEG error or message */ | |
JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer)); | |
#define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */ | |
/* Reset error state variables at start of a new image */ | |
JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo)); | |
/* The message ID code and any parameters are saved here. | |
* A message can have one string parameter or up to 8 int parameters. | |
*/ | |
int msg_code; | |
#define JMSG_STR_PARM_MAX 80 | |
union { | |
int i[8]; | |
char s[JMSG_STR_PARM_MAX]; | |
} msg_parm; | |
/* Standard state variables for error facility */ | |
int trace_level; /* max msg_level that will be displayed */ | |
/* For recoverable corrupt-data errors, we emit a warning message, | |
* but keep going unless emit_message chooses to abort. emit_message | |
* should count warnings in num_warnings. The surrounding application | |
* can check for bad data by seeing if num_warnings is nonzero at the | |
* end of processing. | |
*/ | |
long num_warnings; /* number of corrupt-data warnings */ | |
/* These fields point to the table(s) of error message strings. | |
* An application can change the table pointer to switch to a different | |
* message list (typically, to change the language in which errors are | |
* reported). Some applications may wish to add additional error codes | |
* that will be handled by the JPEG library error mechanism; the second | |
* table pointer is used for this purpose. | |
* | |
* First table includes all errors generated by JPEG library itself. | |
* Error code 0 is reserved for a "no such error string" message. | |
*/ | |
const char * const * jpeg_message_table; /* Library errors */ | |
int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ | |
/* Second table can be added by application (see cjpeg/djpeg for example). | |
* It contains strings numbered first_addon_message..last_addon_message. | |
*/ | |
const char * const * addon_message_table; /* Non-library errors */ | |
int first_addon_message; /* code for first string in addon table */ | |
int last_addon_message; /* code for last string in addon table */ | |
}; | |
/* Progress monitor object */ | |
struct jpeg_progress_mgr { | |
JMETHOD(void, progress_monitor, (j_common_ptr cinfo)); | |
long pass_counter; /* work units completed in this pass */ | |
long pass_limit; /* total number of work units in this pass */ | |
int completed_passes; /* passes completed so far */ | |
int total_passes; /* total number of passes expected */ | |
}; | |
/* Data destination object for compression */ | |
struct jpeg_destination_mgr { | |
JOCTET * next_output_byte; /* => next byte to write in buffer */ | |
size_t free_in_buffer; /* # of byte spaces remaining in buffer */ | |
JMETHOD(void, init_destination, (j_compress_ptr cinfo)); | |
JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo)); | |
JMETHOD(void, term_destination, (j_compress_ptr cinfo)); | |
}; | |
/* Data source object for decompression */ | |
struct jpeg_source_mgr { | |
const JOCTET * next_input_byte; /* => next byte to read from buffer */ | |
size_t bytes_in_buffer; /* # of bytes remaining in buffer */ | |
JMETHOD(void, init_source, (j_decompress_ptr cinfo)); | |
JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); | |
JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); | |
JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); | |
JMETHOD(void, term_source, (j_decompress_ptr cinfo)); | |
}; | |
/* Memory manager object. | |
* Allocates "small" objects (a few K total), "large" objects (tens of K), | |
* and "really big" objects (virtual arrays with backing store if needed). | |
* The memory manager does not allow individual objects to be freed; rather, | |
* each created object is assigned to a pool, and whole pools can be freed | |
* at once. This is faster and more convenient than remembering exactly what | |
* to free, especially where malloc()/free() are not too speedy. | |
* NB: alloc routines never return NULL. They exit to error_exit if not | |
* successful. | |
*/ | |
#define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ | |
#define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ | |
#define JPOOL_NUMPOOLS 2 | |
typedef struct jvirt_sarray_control * jvirt_sarray_ptr; | |
typedef struct jvirt_barray_control * jvirt_barray_ptr; | |
struct jpeg_memory_mgr { | |
/* Method pointers */ | |
JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, | |
size_t sizeofobject)); | |
JMETHOD(void *, alloc_large, (j_common_ptr cinfo, int pool_id, | |
size_t sizeofobject)); | |
JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, | |
JDIMENSION samplesperrow, | |
JDIMENSION numrows)); | |
JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, | |
JDIMENSION blocksperrow, | |
JDIMENSION numrows)); | |
JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo, | |
int pool_id, | |
boolean pre_zero, | |
JDIMENSION samplesperrow, | |
JDIMENSION numrows, | |
JDIMENSION maxaccess)); | |
JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo, | |
int pool_id, | |
boolean pre_zero, | |
JDIMENSION blocksperrow, | |
JDIMENSION numrows, | |
JDIMENSION maxaccess)); | |
JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo)); | |
JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo, | |
jvirt_sarray_ptr ptr, | |
JDIMENSION start_row, | |
JDIMENSION num_rows, | |
boolean writable)); | |
JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, | |
jvirt_barray_ptr ptr, | |
JDIMENSION start_row, | |
JDIMENSION num_rows, | |
boolean writable)); | |
JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id)); | |
JMETHOD(void, self_destruct, (j_common_ptr cinfo)); | |
/* Limit on memory allocation for this JPEG object. (Note that this is | |
* merely advisory, not a guaranteed maximum; it only affects the space | |
* used for virtual-array buffers.) May be changed by outer application | |
* after creating the JPEG object. | |
*/ | |
long max_memory_to_use; | |
/* Maximum allocation request accepted by alloc_large. */ | |
long max_alloc_chunk; | |
}; | |
/* Routine signature for application-supplied marker processing methods. | |
* Need not pass marker code since it is stored in cinfo->unread_marker. | |
*/ | |
typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); | |
/* Declarations for routines called by application. | |
* The JPP macro hides prototype parameters from compilers that can't cope. | |
* Note JPP requires double parentheses. | |
*/ | |
#ifdef HAVE_PROTOTYPES | |
#define JPP(arglist) arglist | |
#else | |
#define JPP(arglist) () | |
#endif | |
/* Short forms of external names for systems with brain-damaged linkers. | |
* We shorten external names to be unique in the first six letters, which | |
* is good enough for all known systems. | |
* (If your compiler itself needs names to be unique in less than 15 | |
* characters, you are out of luck. Get a better compiler.) | |
*/ | |
#ifdef NEED_SHORT_EXTERNAL_NAMES | |
#define jpeg_std_error jStdError | |
#define jpeg_CreateCompress jCreaCompress | |
#define jpeg_CreateDecompress jCreaDecompress | |
#define jpeg_destroy_compress jDestCompress | |
#define jpeg_destroy_decompress jDestDecompress | |
#define jpeg_stdio_dest jStdDest | |
#define jpeg_stdio_src jStdSrc | |
#define jpeg_set_defaults jSetDefaults | |
#define jpeg_set_colorspace jSetColorspace | |
#define jpeg_default_colorspace jDefColorspace | |
#define jpeg_set_quality jSetQuality | |
#define jpeg_set_linear_quality jSetLQuality | |
#define jpeg_add_quant_table jAddQuantTable | |
#define jpeg_quality_scaling jQualityScaling | |
#define jpeg_simple_progression jSimProgress | |
#define jpeg_suppress_tables jSuppressTables | |
#define jpeg_alloc_quant_table jAlcQTable | |
#define jpeg_alloc_huff_table jAlcHTable | |
#define jpeg_start_compress jStrtCompress | |
#define jpeg_write_scanlines jWrtScanlines | |
#define jpeg_finish_compress jFinCompress | |
#define jpeg_write_raw_data jWrtRawData | |
#define jpeg_write_marker jWrtMarker | |
#define jpeg_write_m_header jWrtMHeader | |
#define jpeg_write_m_byte jWrtMByte | |
#define jpeg_write_tables jWrtTables | |
#define jpeg_read_header jReadHeader | |
#define jpeg_start_decompress jStrtDecompress | |
#define jpeg_read_scanlines jReadScanlines | |
#define jpeg_finish_decompress jFinDecompress | |
#define jpeg_read_raw_data jReadRawData | |
#define jpeg_has_multiple_scans jHasMultScn | |
#define jpeg_start_output jStrtOutput | |
#define jpeg_finish_output jFinOutput | |
#define jpeg_input_complete jInComplete | |
#define jpeg_new_colormap jNewCMap | |
#define jpeg_consume_input jConsumeInput | |
#define jpeg_calc_output_dimensions jCalcDimensions | |
#define jpeg_save_markers jSaveMarkers | |
#define jpeg_set_marker_processor jSetMarker | |
#define jpeg_read_coefficients jReadCoefs | |
#define jpeg_write_coefficients jWrtCoefs | |
#define jpeg_copy_critical_parameters jCopyCrit | |
#define jpeg_abort_compress jAbrtCompress | |
#define jpeg_abort_decompress jAbrtDecompress | |
#define jpeg_abort jAbort | |
#define jpeg_destroy jDestroy | |
#define jpeg_resync_to_restart jResyncRestart | |
#endif /* NEED_SHORT_EXTERNAL_NAMES */ | |
/* Default error-management setup */ | |
EXTERN(struct jpeg_error_mgr *) jpeg_std_error | |
JPP((struct jpeg_error_mgr * err)); | |
/* Initialization of JPEG compression objects. | |
* jpeg_create_compress() and jpeg_create_decompress() are the exported | |
* names that applications should call. These expand to calls on | |
* jpeg_CreateCompress and jpeg_CreateDecompress with additional information | |
* passed for version mismatch checking. | |
* NB: you must set up the error-manager BEFORE calling jpeg_create_xxx. | |
*/ | |
#define jpeg_create_compress(cinfo) \ | |
jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \ | |
(size_t) sizeof(struct jpeg_compress_struct)) | |
#define jpeg_create_decompress(cinfo) \ | |
jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \ | |
(size_t) sizeof(struct jpeg_decompress_struct)) | |
EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo, | |
int version, size_t structsize)); | |
EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo, | |
int version, size_t structsize)); | |
/* Destruction of JPEG compression objects */ | |
EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo)); | |
EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo)); | |
#if 0 | |
/* Standard data source and destination managers: stdio streams. */ | |
/* Caller is responsible for opening the file before and closing after. */ | |
EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FXSYS_FILE * outfile)); | |
EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FXSYS_FILE * infile)); | |
#endif | |
/* Default parameter setup for compression */ | |
EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo)); | |
/* Compression parameter setup aids */ | |
EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo, | |
J_COLOR_SPACE colorspace)); | |
EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo)); | |
EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality, | |
boolean force_baseline)); | |
EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo, | |
int scale_factor, | |
boolean force_baseline)); | |
EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl, | |
const unsigned int *basic_table, | |
int scale_factor, | |
boolean force_baseline)); | |
EXTERN(int) jpeg_quality_scaling JPP((int quality)); | |
EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo)); | |
EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo, | |
boolean suppress)); | |
EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo)); | |
EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo)); | |
/* Main entry points for compression */ | |
EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo, | |
boolean write_all_tables)); | |
EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo, | |
JSAMPARRAY scanlines, | |
JDIMENSION num_lines)); | |
EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo)); | |
/* Replaces jpeg_write_scanlines when writing raw downsampled data. */ | |
EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo, | |
JSAMPIMAGE data, | |
JDIMENSION num_lines)); | |
/* Write a special marker. See libjpeg.doc concerning safe usage. */ | |
EXTERN(void) jpeg_write_marker | |
JPP((j_compress_ptr cinfo, int marker, | |
const JOCTET * dataptr, unsigned int datalen)); | |
/* Same, but piecemeal. */ | |
EXTERN(void) jpeg_write_m_header | |
JPP((j_compress_ptr cinfo, int marker, unsigned int datalen)); | |
EXTERN(void) jpeg_write_m_byte | |
JPP((j_compress_ptr cinfo, int val)); | |
/* Alternate compression function: just write an abbreviated table file */ | |
EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo)); | |
/* Decompression startup: read start of JPEG datastream to see what's there */ | |
EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo, | |
boolean require_image)); | |
/* Return value is one of: */ | |
#define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ | |
#define JPEG_HEADER_OK 1 /* Found valid image datastream */ | |
#define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ | |
/* If you pass require_image = TRUE (normal case), you need not check for | |
* a TABLES_ONLY return code; an abbreviated file will cause an error exit. | |
* JPEG_SUSPENDED is only possible if you use a data source module that can | |
* give a suspension return (the stdio source module doesn't). | |
*/ | |
/* Main entry points for decompression */ | |
EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo)); | |
EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo, | |
JSAMPARRAY scanlines, | |
JDIMENSION max_lines)); | |
EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); | |
/* Replaces jpeg_read_scanlines when reading raw downsampled data. */ | |
EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo, | |
JSAMPIMAGE data, | |
JDIMENSION max_lines)); | |
/* Additional entry points for buffered-image mode. */ | |
EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo)); | |
EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo, | |
int scan_number)); | |
EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo)); | |
EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo)); | |
EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo)); | |
EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo)); | |
/* Return value is one of: */ | |
/* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */ | |
#define JPEG_REACHED_SOS 1 /* Reached start of new scan */ | |
#define JPEG_REACHED_EOI 2 /* Reached end of image */ | |
#define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ | |
#define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ | |
/* Precalculate output dimensions for current decompression parameters. */ | |
EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo)); | |
/* Control saving of COM and APPn markers into marker_list. */ | |
EXTERN(void) jpeg_save_markers | |
JPP((j_decompress_ptr cinfo, int marker_code, | |
unsigned int length_limit)); | |
/* Install a special processing method for COM or APPn markers. */ | |
EXTERN(void) jpeg_set_marker_processor | |
JPP((j_decompress_ptr cinfo, int marker_code, | |
jpeg_marker_parser_method routine)); | |
/* Read or write raw DCT coefficients --- useful for lossless transcoding. */ | |
EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo)); | |
EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo, | |
jvirt_barray_ptr * coef_arrays)); | |
EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, | |
j_compress_ptr dstinfo)); | |
/* If you choose to abort compression or decompression before completing | |
* jpeg_finish_(de)compress, then you need to clean up to release memory, | |
* temporary files, etc. You can just call jpeg_destroy_(de)compress | |
* if you're done with the JPEG object, but if you want to clean it up and | |
* reuse it, call this: | |
*/ | |
EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo)); | |
EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo)); | |
/* Generic versions of jpeg_abort and jpeg_destroy that work on either | |
* flavor of JPEG object. These may be more convenient in some places. | |
*/ | |
EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo)); | |
EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo)); | |
/* Default restart-marker-resync procedure for use by data source modules */ | |
EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, | |
int desired)); | |
/* These marker codes are exported since applications and data source modules | |
* are likely to want to use them. | |
*/ | |
#define JPEG_RST0 0xD0 /* RST0 marker code */ | |
#define JPEG_EOI 0xD9 /* EOI marker code */ | |
#define JPEG_APP0 0xE0 /* APP0 marker code */ | |
#define JPEG_COM 0xFE /* COM marker code */ | |
/* If we have a brain-damaged compiler that emits warnings (or worse, errors) | |
* for structure definitions that are never filled in, keep it quiet by | |
* supplying dummy definitions for the various substructures. | |
*/ | |
#ifdef INCOMPLETE_TYPES_BROKEN | |
#ifndef JPEG_INTERNALS /* will be defined in jpegint.h */ | |
struct jvirt_sarray_control { long dummy; }; | |
struct jvirt_barray_control { long dummy; }; | |
struct jpeg_comp_master { long dummy; }; | |
struct jpeg_c_main_controller { long dummy; }; | |
struct jpeg_c_prep_controller { long dummy; }; | |
struct jpeg_c_coef_controller { long dummy; }; | |
struct jpeg_marker_writer { long dummy; }; | |
struct jpeg_color_converter { long dummy; }; | |
struct jpeg_downsampler { long dummy; }; | |
struct jpeg_forward_dct { long dummy; }; | |
struct jpeg_entropy_encoder { long dummy; }; | |
struct jpeg_decomp_master { long dummy; }; | |
struct jpeg_d_main_controller { long dummy; }; | |
struct jpeg_d_coef_controller { long dummy; }; | |
struct jpeg_d_post_controller { long dummy; }; | |
struct jpeg_input_controller { long dummy; }; | |
struct jpeg_marker_reader { long dummy; }; | |
struct jpeg_entropy_decoder { long dummy; }; | |
struct jpeg_inverse_dct { long dummy; }; | |
struct jpeg_upsampler { long dummy; }; | |
struct jpeg_color_deconverter { long dummy; }; | |
struct jpeg_color_quantizer { long dummy; }; | |
#endif /* JPEG_INTERNALS */ | |
#endif /* INCOMPLETE_TYPES_BROKEN */ | |
/* | |
* The JPEG library modules define JPEG_INTERNALS before including this file. | |
* The internal structure declarations are read only when that is true. | |
* Applications using the library should not include jpegint.h, but may wish | |
* to include jerror.h. | |
*/ | |
#ifdef JPEG_INTERNALS | |
#include "jpegint.h" /* fetch private declarations */ | |
#include "jerror.h" /* fetch error codes too */ | |
#endif | |
#endif /* JPEGLIB_H */ |