383 lines
15 KiB
C
383 lines
15 KiB
C
// * jpegint.h
|
|
// *
|
|
// * Copyright (C) 1991-1995, 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 provides common declarations for the various JPEG modules.
|
|
// * These declarations are considered internal to the JPEG library; most
|
|
// * applications using the library shouldn't need to include this file.
|
|
|
|
|
|
// Declarations for both compression & decompression
|
|
|
|
typedef enum { // Operating modes for buffer controllers
|
|
JBUF_PASS_THRU, // Plain stripwise operation
|
|
// Remaining modes require a full-image buffer to have been created
|
|
JBUF_SAVE_SOURCE, // Run source subobject only, save output
|
|
JBUF_CRANK_DEST, // Run dest subobject only, using saved data
|
|
JBUF_SAVE_AND_PASS // Run both subobjects, save output
|
|
} J_BUF_MODE;
|
|
|
|
// Values of global_state field (jdapi.c has some dependencies on ordering!)
|
|
#define CSTATE_START 100 // after create_compress
|
|
#define CSTATE_SCANNING 101 // start_compress done, write_scanlines OK
|
|
#define CSTATE_RAW_OK 102 // start_compress done, write_raw_data OK
|
|
#define CSTATE_WRCOEFS 103 // jpeg_write_coefficients done
|
|
#define DSTATE_START 200 // after create_decompress
|
|
#define DSTATE_INHEADER 201 // reading header markers, no SOS yet
|
|
#define DSTATE_READY 202 // found SOS, ready for start_decompress
|
|
#define DSTATE_PRELOAD 203 // reading multiscan file in start_decompress
|
|
#define DSTATE_PRESCAN 204 // performing dummy pass for 2-pass quant
|
|
#define DSTATE_SCANNING 205 // start_decompress done, read_scanlines OK
|
|
#define DSTATE_RAW_OK 206 // start_decompress done, read_raw_data OK
|
|
#define DSTATE_BUFIMAGE 207 // expecting jpeg_start_output
|
|
#define DSTATE_BUFPOST 208 // looking for SOS/EOI in jpeg_finish_output
|
|
#define DSTATE_RDCOEFS 209 // reading file in jpeg_read_coefficients
|
|
#define DSTATE_STOPPING 210 // looking for EOI in jpeg_finish_decompress
|
|
|
|
|
|
// Declarations for compression modules
|
|
|
|
// Master control module
|
|
struct jpeg_comp_master {
|
|
JMETHOD(void, prepare_for_pass, (j_compress_ptr cinfo));
|
|
JMETHOD(void, pass_startup, (j_compress_ptr cinfo));
|
|
JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
|
|
|
|
// State variables made visible to other modules
|
|
boolean call_pass_startup; // True if pass_startup must be called
|
|
boolean is_last_pass; // True during last pass
|
|
};
|
|
|
|
// Main buffer control (downsampled-data buffer)
|
|
struct jpeg_c_main_controller {
|
|
JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
|
|
JMETHOD(void, process_data, (j_compress_ptr cinfo,
|
|
JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
|
|
JDIMENSION in_rows_avail));
|
|
};
|
|
|
|
// Compression preprocessing (downsampling input buffer control)
|
|
struct jpeg_c_prep_controller {
|
|
JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
|
|
JMETHOD(void, pre_process_data, (j_compress_ptr cinfo,
|
|
JSAMPARRAY input_buf,
|
|
JDIMENSION *in_row_ctr,
|
|
JDIMENSION in_rows_avail,
|
|
JSAMPIMAGE output_buf,
|
|
JDIMENSION *out_row_group_ctr,
|
|
JDIMENSION out_row_groups_avail));
|
|
};
|
|
|
|
// Coefficient buffer control
|
|
struct jpeg_c_coef_controller {
|
|
JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
|
|
JMETHOD(boolean, compress_data, (j_compress_ptr cinfo,
|
|
JSAMPIMAGE input_buf));
|
|
};
|
|
|
|
// Colorspace conversion
|
|
struct jpeg_color_converter {
|
|
JMETHOD(void, start_pass, (j_compress_ptr cinfo));
|
|
JMETHOD(void, color_convert, (j_compress_ptr cinfo,
|
|
JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
|
|
JDIMENSION output_row, int num_rows));
|
|
};
|
|
|
|
// Downsampling
|
|
struct jpeg_downsampler {
|
|
JMETHOD(void, start_pass, (j_compress_ptr cinfo));
|
|
JMETHOD(void, downsample, (j_compress_ptr cinfo,
|
|
JSAMPIMAGE input_buf, JDIMENSION in_row_index,
|
|
JSAMPIMAGE output_buf,
|
|
JDIMENSION out_row_group_index));
|
|
|
|
boolean need_context_rows; // TRUE if need rows above & below
|
|
};
|
|
|
|
// Forward DCT (also controls coefficient quantization)
|
|
struct jpeg_forward_dct {
|
|
JMETHOD(void, start_pass, (j_compress_ptr cinfo));
|
|
// perhaps this should be an array???
|
|
JMETHOD(void, forward_DCT, (j_compress_ptr cinfo,
|
|
jpeg_component_info * compptr,
|
|
JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
|
|
JDIMENSION start_row, JDIMENSION start_col,
|
|
JDIMENSION num_blocks));
|
|
};
|
|
|
|
// Entropy encoding
|
|
struct jpeg_entropy_encoder {
|
|
JMETHOD(void, start_pass, (j_compress_ptr cinfo, boolean gather_statistics));
|
|
JMETHOD(boolean, encode_mcu, (j_compress_ptr cinfo, JBLOCKROW *MCU_data));
|
|
JMETHOD(void, finish_pass, (j_compress_ptr cinfo));
|
|
};
|
|
|
|
// Marker writing
|
|
struct jpeg_marker_writer {
|
|
// write_any_marker is exported for use by applications
|
|
// Probably only COM and APPn markers should be written
|
|
JMETHOD(void, write_any_marker, (j_compress_ptr cinfo, int marker,
|
|
const JOCTET *dataptr, unsigned int datalen));
|
|
JMETHOD(void, write_file_header, (j_compress_ptr cinfo));
|
|
JMETHOD(void, write_frame_header, (j_compress_ptr cinfo));
|
|
JMETHOD(void, write_scan_header, (j_compress_ptr cinfo));
|
|
JMETHOD(void, write_file_trailer, (j_compress_ptr cinfo));
|
|
JMETHOD(void, write_tables_only, (j_compress_ptr cinfo));
|
|
};
|
|
|
|
|
|
// Declarations for decompression modules
|
|
|
|
// Master control module
|
|
struct jpeg_decomp_master {
|
|
JMETHOD(void, prepare_for_output_pass, (j_decompress_ptr cinfo));
|
|
JMETHOD(void, finish_output_pass, (j_decompress_ptr cinfo));
|
|
|
|
// State variables made visible to other modules
|
|
boolean is_dummy_pass; // True during 1st pass for 2-pass quant
|
|
};
|
|
|
|
// Input control module
|
|
struct jpeg_input_controller {
|
|
JMETHOD(int, consume_input, (j_decompress_ptr cinfo));
|
|
JMETHOD(void, reset_input_controller, (j_decompress_ptr cinfo));
|
|
JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
|
|
JMETHOD(void, finish_input_pass, (j_decompress_ptr cinfo));
|
|
|
|
// State variables made visible to other modules
|
|
boolean has_multiple_scans; // True if file has multiple scans
|
|
boolean eoi_reached; // True when EOI has been consumed
|
|
};
|
|
|
|
// Main buffer control (downsampled-data buffer)
|
|
struct jpeg_d_main_controller {
|
|
JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
|
|
JMETHOD(void, process_data, (j_decompress_ptr cinfo,
|
|
JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
|
|
JDIMENSION out_rows_avail));
|
|
};
|
|
|
|
// Coefficient buffer control
|
|
struct jpeg_d_coef_controller {
|
|
JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo));
|
|
JMETHOD(int, consume_data, (j_decompress_ptr cinfo));
|
|
JMETHOD(void, start_output_pass, (j_decompress_ptr cinfo));
|
|
JMETHOD(int, decompress_data, (j_decompress_ptr cinfo,
|
|
JSAMPIMAGE output_buf));
|
|
// Pointer to array of coefficient virtual arrays, or NULL if none
|
|
jvirt_barray_ptr *coef_arrays;
|
|
};
|
|
|
|
// Decompression postprocessing (color quantization buffer control)
|
|
struct jpeg_d_post_controller {
|
|
JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode));
|
|
JMETHOD(void, post_process_data, (j_decompress_ptr cinfo,
|
|
JSAMPIMAGE input_buf,
|
|
JDIMENSION *in_row_group_ctr,
|
|
JDIMENSION in_row_groups_avail,
|
|
JSAMPARRAY output_buf,
|
|
JDIMENSION *out_row_ctr,
|
|
JDIMENSION out_rows_avail));
|
|
};
|
|
|
|
// Marker reading & parsing
|
|
struct jpeg_marker_reader {
|
|
JMETHOD(void, reset_marker_reader, (j_decompress_ptr cinfo));
|
|
// Read markers until SOS or EOI.
|
|
// * Returns same codes as are defined for jpeg_consume_input:
|
|
// * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
|
|
JMETHOD(int, read_markers, (j_decompress_ptr cinfo));
|
|
// Read a restart marker --- exported for use by entropy decoder only
|
|
jpeg_marker_parser_method read_restart_marker;
|
|
// Application-overridable marker processing methods
|
|
jpeg_marker_parser_method process_COM;
|
|
jpeg_marker_parser_method process_APPn[16];
|
|
|
|
// State of marker reader --- nominally internal, but applications
|
|
// * supplying COM or APPn handlers might like to know the state.
|
|
boolean saw_SOI; // found SOI?
|
|
boolean saw_SOF; // found SOF?
|
|
int next_restart_num; // next restart number expected (0-7)
|
|
unsigned int discarded_bytes; // # of bytes skipped looking for a marker
|
|
};
|
|
|
|
// Entropy decoding
|
|
struct jpeg_entropy_decoder {
|
|
JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
|
|
JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo,
|
|
JBLOCKROW *MCU_data));
|
|
};
|
|
|
|
// Inverse DCT (also performs dequantization)
|
|
typedef JMETHOD(void, inverse_DCT_method_ptr,
|
|
(j_decompress_ptr cinfo, jpeg_component_info * compptr,
|
|
JCOEFPTR coef_block,
|
|
JSAMPARRAY output_buf, JDIMENSION output_col));
|
|
|
|
struct jpeg_inverse_dct {
|
|
JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
|
|
// It is useful to allow each component to have a separate IDCT method.
|
|
inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS];
|
|
};
|
|
|
|
// Upsampling (note that upsampler must also call color converter)
|
|
struct jpeg_upsampler {
|
|
JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
|
|
JMETHOD(void, upsample, (j_decompress_ptr cinfo,
|
|
JSAMPIMAGE input_buf,
|
|
JDIMENSION *in_row_group_ctr,
|
|
JDIMENSION in_row_groups_avail,
|
|
JSAMPARRAY output_buf,
|
|
JDIMENSION *out_row_ctr,
|
|
JDIMENSION out_rows_avail));
|
|
|
|
boolean need_context_rows; // TRUE if need rows above & below
|
|
};
|
|
|
|
// Colorspace conversion
|
|
struct jpeg_color_deconverter {
|
|
JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
|
|
JMETHOD(void, color_convert, (j_decompress_ptr cinfo,
|
|
JSAMPIMAGE input_buf, JDIMENSION input_row,
|
|
JSAMPARRAY output_buf, int num_rows));
|
|
};
|
|
|
|
// Color quantization or color precision reduction
|
|
struct jpeg_color_quantizer {
|
|
JMETHOD(void, start_pass, (j_decompress_ptr cinfo, boolean is_pre_scan));
|
|
JMETHOD(void, color_quantize, (j_decompress_ptr cinfo,
|
|
JSAMPARRAY input_buf, JSAMPARRAY output_buf,
|
|
int num_rows));
|
|
JMETHOD(void, finish_pass, (j_decompress_ptr cinfo));
|
|
JMETHOD(void, new_color_map, (j_decompress_ptr cinfo));
|
|
};
|
|
|
|
|
|
// Miscellaneous useful macros
|
|
|
|
// #undef MAX
|
|
// #define MAX(a,b) ((a) > (b) ? (a) : (b))
|
|
// #undef MIN
|
|
// #define MIN(a,b) ((a) < (b) ? (a) : (b))
|
|
|
|
|
|
// We assume that right shift corresponds to signed division by 2 with
|
|
// * rounding towards minus infinity. This is correct for typical "arithmetic
|
|
// * shift" instructions that shift in copies of the sign bit. But some
|
|
// * C compilers implement >> with an unsigned shift. For these machines you
|
|
// * must define RIGHT_SHIFT_IS_UNSIGNED.
|
|
// * RIGHT_SHIFT provides a proper signed right shift of an INT32 quantity.
|
|
// * It is only applied with constant shift counts. SHIFT_TEMPS must be
|
|
// * included in the variables of any routine using RIGHT_SHIFT.
|
|
|
|
#ifdef RIGHT_SHIFT_IS_UNSIGNED
|
|
#define SHIFT_TEMPS INT32 shift_temp;
|
|
#define RIGHT_SHIFT(x,shft) \
|
|
((shift_temp = (x)) < 0 ? \
|
|
(shift_temp >> (shft)) | ((~((INT32) 0)) << (32-(shft))) : \
|
|
(shift_temp >> (shft)))
|
|
#else
|
|
#define SHIFT_TEMPS
|
|
#define RIGHT_SHIFT(x,shft) ((x) >> (shft))
|
|
#endif
|
|
|
|
|
|
// Short forms of external names for systems with brain-damaged linkers.
|
|
|
|
#ifdef NEED_SHORT_EXTERNAL_NAMES
|
|
#define jinit_compress_master jICompress
|
|
#define jinit_c_master_control jICMaster
|
|
#define jinit_c_main_controller jICMainC
|
|
#define jinit_c_prep_controller jICPrepC
|
|
#define jinit_c_coef_controller jICCoefC
|
|
#define jinit_color_converter jICColor
|
|
#define jinit_downsampler jIDownsampler
|
|
#define jinit_forward_dct jIFDCT
|
|
#define jinit_huff_encoder jIHEncoder
|
|
#define jinit_phuff_encoder jIPHEncoder
|
|
#define jinit_marker_writer jIMWriter
|
|
#define jinit_master_decompress jIDMaster
|
|
#define jinit_d_main_controller jIDMainC
|
|
#define jinit_d_coef_controller jIDCoefC
|
|
#define jinit_d_post_controller jIDPostC
|
|
#define jinit_input_controller jIInCtlr
|
|
#define jinit_marker_reader jIMReader
|
|
#define jinit_huff_decoder jIHDecoder
|
|
#define jinit_phuff_decoder jIPHDecoder
|
|
#define jinit_inverse_dct jIIDCT
|
|
#define jinit_upsampler jIUpsampler
|
|
#define jinit_color_deconverter jIDColor
|
|
#define jinit_1pass_quantizer jI1Quant
|
|
#define jinit_2pass_quantizer jI2Quant
|
|
#define jinit_merged_upsampler jIMUpsampler
|
|
#define jinit_memory_mgr jIMemMgr
|
|
#define jdiv_round_up jDivRound
|
|
#define jround_up jRound
|
|
#define jcopy_sample_rows jCopySamples
|
|
#define jcopy_block_row jCopyBlocks
|
|
#define jzero_far jZeroFar
|
|
#define jpeg_zigzag_order jZIGTable
|
|
#define jpeg_natural_order jZAGTable
|
|
#endif // NEED_SHORT_EXTERNAL_NAMES
|
|
|
|
|
|
// Compression module initialization routines
|
|
EXTERN void jinit_compress_master JPP((j_compress_ptr cinfo));
|
|
EXTERN void jinit_c_master_control JPP((j_compress_ptr cinfo,
|
|
boolean transcode_only));
|
|
EXTERN void jinit_c_main_controller JPP((j_compress_ptr cinfo,
|
|
boolean need_full_buffer));
|
|
EXTERN void jinit_c_prep_controller JPP((j_compress_ptr cinfo,
|
|
boolean need_full_buffer));
|
|
EXTERN void jinit_c_coef_controller JPP((j_compress_ptr cinfo,
|
|
boolean need_full_buffer));
|
|
EXTERN void jinit_color_converter JPP((j_compress_ptr cinfo));
|
|
EXTERN void jinit_downsampler JPP((j_compress_ptr cinfo));
|
|
EXTERN void jinit_forward_dct JPP((j_compress_ptr cinfo));
|
|
EXTERN void jinit_huff_encoder JPP((j_compress_ptr cinfo));
|
|
EXTERN void jinit_phuff_encoder JPP((j_compress_ptr cinfo));
|
|
EXTERN void jinit_marker_writer JPP((j_compress_ptr cinfo));
|
|
// Decompression module initialization routines
|
|
EXTERN void jinit_master_decompress JPP((j_decompress_ptr cinfo));
|
|
EXTERN void jinit_d_main_controller JPP((j_decompress_ptr cinfo,
|
|
boolean need_full_buffer));
|
|
EXTERN void jinit_d_coef_controller JPP((j_decompress_ptr cinfo,
|
|
boolean need_full_buffer));
|
|
EXTERN void jinit_d_post_controller JPP((j_decompress_ptr cinfo,
|
|
boolean need_full_buffer));
|
|
EXTERN void jinit_input_controller JPP((j_decompress_ptr cinfo));
|
|
EXTERN void jinit_marker_reader JPP((j_decompress_ptr cinfo));
|
|
EXTERN void jinit_huff_decoder JPP((j_decompress_ptr cinfo));
|
|
EXTERN void jinit_phuff_decoder JPP((j_decompress_ptr cinfo));
|
|
EXTERN void jinit_inverse_dct JPP((j_decompress_ptr cinfo));
|
|
EXTERN void jinit_upsampler JPP((j_decompress_ptr cinfo));
|
|
EXTERN void jinit_color_deconverter JPP((j_decompress_ptr cinfo));
|
|
EXTERN void jinit_1pass_quantizer JPP((j_decompress_ptr cinfo));
|
|
EXTERN void jinit_2pass_quantizer JPP((j_decompress_ptr cinfo));
|
|
EXTERN void jinit_merged_upsampler JPP((j_decompress_ptr cinfo));
|
|
// Memory manager initialization
|
|
EXTERN void jinit_memory_mgr JPP((j_common_ptr cinfo));
|
|
|
|
// Utility routines in jutils.c
|
|
EXTERN LONG jdiv_round_up JPP((LONG a, LONG b));
|
|
EXTERN LONG jround_up JPP((LONG a, LONG b));
|
|
EXTERN void jcopy_sample_rows JPP((JSAMPARRAY input_array, int source_row,
|
|
JSAMPARRAY output_array, int dest_row,
|
|
int num_rows, JDIMENSION num_cols));
|
|
EXTERN void jcopy_block_row JPP((JBLOCKROW input_row, JBLOCKROW output_row,
|
|
JDIMENSION num_blocks));
|
|
EXTERN void jzero_far JPP((void FAR * target, size_t bytestozero));
|
|
// Constant tables in jutils.c
|
|
extern const int jpeg_zigzag_order[]; // natural coef order to zigzag order
|
|
extern const int jpeg_natural_order[]; // zigzag coef order to natural order
|
|
|
|
// Suppress undefined-structure complaints if necessary.
|
|
|
|
#ifdef INCOMPLETE_TYPES_BROKEN
|
|
#ifndef AM_MEMORY_MANAGER // only jmemmgr.c defines these
|
|
struct jvirt_sarray_control { LONG dummy; };
|
|
struct jvirt_barray_control { LONG dummy; };
|
|
#endif
|
|
#endif // INCOMPLETE_TYPES_BROKEN
|