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/* |
* jpegint.h |
* |
* Copyright (C) 1991-1997, 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. |
*/ |
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/* Declarations for both compression & decompression */ |
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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; |
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/* 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 */ |
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/* Declarations for compression modules */ |
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/* 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)); |
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/* 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 */ |
}; |
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/* 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)); |
}; |
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/* 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)); |
}; |
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/* 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)); |
}; |
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/* 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)); |
}; |
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/* 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)); |
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boolean need_context_rows; /* TRUE if need rows above & below */ |
}; |
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/* 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)); |
}; |
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/* 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)); |
}; |
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/* Marker writing */ |
struct jpeg_marker_writer { |
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)); |
/* These routines are exported to allow insertion of extra markers */ |
/* Probably only COM and APPn markers should be written this way */ |
JMETHOD(void, write_marker_header, (j_compress_ptr cinfo, int marker, |
unsigned int datalen)); |
JMETHOD(void, write_marker_byte, (j_compress_ptr cinfo, int val)); |
}; |
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/* Declarations for decompression modules */ |
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/* 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)); |
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/* State variables made visible to other modules */ |
boolean is_dummy_pass; /* True during 1st pass for 2-pass quant */ |
}; |
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/* 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)); |
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/* 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 */ |
}; |
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/* 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)); |
}; |
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/* 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; |
}; |
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/* 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)); |
}; |
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/* 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; |
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/* 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 */ |
}; |
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/* 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)); |
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/* This is here to share code between baseline and progressive decoders; */ |
/* other modules probably should not use it */ |
boolean insufficient_data; /* set TRUE after emitting warning */ |
}; |
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/* 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)); |
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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]; |
}; |
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/* 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)); |
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boolean need_context_rows; /* TRUE if need rows above & below */ |
}; |
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/* 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)); |
}; |
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/* 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)); |
}; |
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/* Miscellaneous useful macros */ |
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#undef MAX |
#define MAX(a,b) ((a) > (b) ? (a) : (b)) |
#undef MIN |
#define MIN(a,b) ((a) < (b) ? (a) : (b)) |
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/* 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. |
*/ |
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#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 |
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/* Short forms of external names for systems with brain-damaged linkers. */ |
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#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 */ |
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/* 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)); |
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/* 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 */ |
#if 0 /* This table is not actually needed in v6a */ |
extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */ |
#endif |
extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */ |
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/* Suppress undefined-structure complaints if necessary. */ |
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#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 */ |