#include <t4_t6_decode.h>

Public Attributes
t4_row_write_handler_t	row_write_handler
	Callback function to write a row of pixels to the image destination.
void *	row_write_user_data
	Opaque pointer passed to row_write_handler.
int	encoding
	The type of compression used between the FAX machines.
int	image_width
	Width of the current page, in pixels.
int	image_length
	Length of the current page, in pixels.
int	bytes_per_row
	The current number of bytes per row of uncompressed image data.
int	row_bits
	The current number of bits in the current encoded row.
uint8_t *	row_buf
	Pointer to the buffer for the current pixel row.
bool	row_is_2d
	True if we are treating the current row as a 2D encoded one.
int	row_len
	The current length of the current row.
uint32_t *	cur_runs
	Black and white run-lengths for the current row.
uint32_t *	ref_runs
	Black and white run-lengths for the reference row.
int	consecutive_eols
	This variable is used to count the consecutive EOLS we have seen. If it reaches six, this is the end of the image. It is initially set to -1 for 1D and 2D decoding, as an indicator that we must wait for the first EOL, before decoding any image data.
int	a0
	The reference or starting changing element on the coding line. At the start of the coding line, a0 is set on an imaginary white changing element situated just before the first element on the line. During the coding of the coding line, the position of a0 is defined by the previous coding mode. (See T.4/4.2.1.3.2.).
int	b1
	The first changing element on the reference line to the right of a0 and of opposite colour to a0.
int	run_length
	The length of the in-progress run of black or white.
int	black_white
	2D horizontal mode control.
bool	in_black
	True if the current run is black.
int	a_cursor
	The current step into the current row run-lengths buffer.
int	b_cursor
	The current step into the reference row run-lengths buffer.
uint32_t	rx_bitstream
	Incoming bit buffer for decompression.
int	rx_bits
	The number of bits currently in rx_bitstream.
int	rx_skip_bits
	The number of bits to be skipped before trying to match the next code word.
uint32_t	pixel_stream
	Decoded pixel stream buffer.
int	pixels
	The number of pixels currently in pixel_stream.
int	min_row_bits
	The minimum bits in any row of the current page. For monitoring only.
int	max_row_bits
	The maximum bits in any row of the current page. For monitoring only.
int	compressed_image_size
	The size of the compressed image, in bits.
int	curr_bad_row_run
	The current number of consecutive bad rows.
int	longest_bad_row_run
	The longest run of consecutive bad rows seen in the current page.
int	bad_rows
	The total number of bad rows in the current page.
logging_state_t	logging
	Error and flow logging control.

Detailed Description

T.4 1D, T4 2D and T6 decompressor state.

Member Data Documentation

◆ compressed_image_size

int t4_t6_decode_state_s::compressed_image_size

The size of the compressed image, in bits.

Referenced by t4_t6_decode_get_compressed_image_size(), t4_t6_decode_put(), and t4_t6_decode_put_bit().

◆ consecutive_eols

int t4_t6_decode_state_s::consecutive_eols

This variable is used to count the consecutive EOLS we have seen. If it reaches six, this is the end of the image. It is initially set to -1 for 1D and 2D decoding, as an indicator that we must wait for the first EOL, before decoding any image data.

Referenced by t4_t6_decode_put().