xface.h File Reference

X-Face common definitions. More...

#include <stdint.h>

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Data Structures
struct	BigInt
struct	ProbRange

Macros
#define	XFACE_WIDTH   48
#define	XFACE_HEIGHT   48
#define	XFACE_PIXELS   (XFACE_WIDTH * XFACE_HEIGHT)
#define	XFACE_FIRST_PRINT   '!'
#define	XFACE_LAST_PRINT   '~'
#define	XFACE_PRINTS   (XFACE_LAST_PRINT - XFACE_FIRST_PRINT + 1)
#define	XFACE_MAX_DIGITS   354
#define	XFACE_BITSPERWORD   8
#define	XFACE_WORDCARRY   (1 << XFACE_BITSPERWORD)
#define	XFACE_WORDMASK   (XFACE_WORDCARRY - 1)
#define	XFACE_MAX_WORDS   ((XFACE_PIXELS * 2 + XFACE_BITSPERWORD - 1) / XFACE_BITSPERWORD)

Enumerations
enum	XFaceColor { XFACE_COLOR_BLACK = 0, XFACE_COLOR_GREY, XFACE_COLOR_WHITE }

Functions
void	ff_big_add (BigInt *b, uint8_t a)
	Add a to b storing the result in b. More...
void	ff_big_div (BigInt *b, uint8_t a, uint8_t *r)
	Divide b by a storing the result in b and the remainder in the word pointed to by r. More...
void	ff_big_mul (BigInt *b, uint8_t a)
	Multiply a by b storing the result in b. More...
void	ff_xface_generate_face (uint8_t *dst, uint8_t *const src)

Variables
const ProbRange	ff_xface_probranges_per_level [4][3]
const ProbRange	ff_xface_probranges_2x2 [16]

Detailed Description

X-Face common definitions.

Definition in file xface.h.

Macro Definition Documentation

#define XFACE_BITSPERWORD   8

Definition at line 49 of file xface.h.

Referenced by ff_big_add(), ff_big_div(), and ff_big_mul().

#define XFACE_FIRST_PRINT   '!'

Definition at line 37 of file xface.h.

Referenced by xface_decode_frame(), and xface_encode_frame().

#define XFACE_HEIGHT   48

Definition at line 31 of file xface.h.

Referenced by ff_xface_generate_face(), xface_decode_init(), and xface_encode_frame().

#define XFACE_LAST_PRINT   '~'

Definition at line 38 of file xface.h.

Referenced by xface_decode_frame().

#define XFACE_MAX_DIGITS   354

Definition at line 47 of file xface.h.

Referenced by xface_decode_frame(), and xface_encode_frame().

#define XFACE_MAX_WORDS   ((XFACE_PIXELS * 2 + XFACE_BITSPERWORD - 1) / XFACE_BITSPERWORD)

Definition at line 53 of file xface.h.

#define XFACE_PIXELS   (XFACE_WIDTH * XFACE_HEIGHT)

Definition at line 32 of file xface.h.

Referenced by pq_push(), xface_decode_frame(), and xface_encode_frame().

#define XFACE_PRINTS   (XFACE_LAST_PRINT - XFACE_FIRST_PRINT + 1)

Definition at line 39 of file xface.h.

Referenced by xface_decode_frame(), and xface_encode_frame().

#define XFACE_WIDTH   48

Definition at line 30 of file xface.h.

Referenced by all_black(), all_same(), decode_block(), encode_block(), ff_xface_generate_face(), pop_greys(), push_greys(), xface_decode_frame(), xface_decode_init(), and xface_encode_frame().

#define XFACE_WORDCARRY   (1 << XFACE_BITSPERWORD)

Definition at line 50 of file xface.h.

#define XFACE_WORDMASK   (XFACE_WORDCARRY - 1)

Definition at line 51 of file xface.h.

Referenced by ff_big_add(), ff_big_div(), and ff_big_mul().

Enumeration Type Documentation

enum XFaceColor

Enumerator
XFACE_COLOR_BLACK
XFACE_COLOR_GREY
XFACE_COLOR_WHITE

Definition at line 81 of file xface.h.

Function Documentation

void ff_big_add	(	BigInt *	b,
		uint8_t	a
	)

Add a to b storing the result in b.

Definition at line 29 of file xface.c.

Referenced by pop_integer(), push_integer(), and xface_decode_frame().

void ff_big_div	(	BigInt *	b,
		uint8_t	a,
		uint8_t *	r
	)

Divide b by a storing the result in b and the remainder in the word pointed to by r.

Definition at line 51 of file xface.c.

Referenced by pop_integer(), push_integer(), and xface_encode_frame().

void ff_big_mul	(	BigInt *	b,
		uint8_t	a
	)

Multiply a by b storing the result in b.

Definition at line 90 of file xface.c.

Referenced by pop_integer(), push_integer(), and xface_decode_frame().

void ff_xface_generate_face	(	uint8_t *	dst,
		uint8_t *const	src
	)

Definition at line 281 of file xface.c.

Referenced by xface_decode_frame(), and xface_encode_frame().

Variable Documentation

const ProbRange ff_xface_probranges_2x2[16]

Definition at line 132 of file xface.c.

Referenced by pop_greys(), and push_greys().

const ProbRange ff_xface_probranges_per_level[4][3]

Definition at line 124 of file xface.c.

Referenced by decode_block(), and encode_block().