OPJ_INTMATH - Implementation of operations on integers

Exported functions (see also openjpeg.h)
static INLINE OPJ_INT32	opj_int_min (OPJ_INT32 a, OPJ_INT32 b)
	Get the minimum of two integers. More...
static INLINE OPJ_UINT32	opj_uint_min (OPJ_UINT32 a, OPJ_UINT32 b)
	Get the minimum of two integers. More...
static INLINE OPJ_INT32	opj_int_max (OPJ_INT32 a, OPJ_INT32 b)
	Get the maximum of two integers. More...
static INLINE OPJ_UINT32	opj_uint_max (OPJ_UINT32 a, OPJ_UINT32 b)
	Get the maximum of two integers. More...
static INLINE OPJ_UINT32	opj_uint_adds (OPJ_UINT32 a, OPJ_UINT32 b)
	Get the saturated sum of two unsigned integers. More...
static INLINE OPJ_INT32	opj_int_clamp (OPJ_INT32 a, OPJ_INT32 min, OPJ_INT32 max)
	Clamp an integer inside an interval. More...
static INLINE OPJ_INT32	opj_int_abs (OPJ_INT32 a)
static INLINE OPJ_INT32	opj_int_ceildiv (OPJ_INT32 a, OPJ_INT32 b)
	Divide an integer and round upwards. More...
static INLINE OPJ_UINT32	opj_uint_ceildiv (OPJ_UINT32 a, OPJ_UINT32 b)
	Divide an integer and round upwards. More...
static INLINE OPJ_INT32	opj_int_ceildivpow2 (OPJ_INT32 a, OPJ_INT32 b)
	Divide an integer by a power of 2 and round upwards. More...
static INLINE OPJ_INT32	opj_int64_ceildivpow2 (OPJ_INT64 a, OPJ_INT32 b)
	Divide a 64bits integer by a power of 2 and round upwards. More...
static INLINE OPJ_UINT32	opj_uint_ceildivpow2 (OPJ_UINT32 a, OPJ_UINT32 b)
	Divide an integer by a power of 2 and round upwards. More...
static INLINE OPJ_INT32	opj_int_floordivpow2 (OPJ_INT32 a, OPJ_INT32 b)
	Divide an integer by a power of 2 and round downwards. More...
static INLINE OPJ_INT32	opj_int_floorlog2 (OPJ_INT32 a)
	Get logarithm of an integer and round downwards. More...
static INLINE OPJ_UINT32	opj_uint_floorlog2 (OPJ_UINT32 a)
	Get logarithm of an integer and round downwards. More...
static INLINE OPJ_INT32	opj_int_fix_mul (OPJ_INT32 a, OPJ_INT32 b)
	Multiply two fixed-precision rational numbers. More...
static INLINE OPJ_INT32	opj_int_fix_mul_t1 (OPJ_INT32 a, OPJ_INT32 b)

Detailed Description

Function Documentation

static INLINE OPJ_INT32 opj_int64_ceildivpow2 ( OPJ_INT64  a, OPJ_INT32  b  )

static

Divide a 64bits integer by a power of 2 and round upwards.

Returns

Returns a divided by 2^b

Referenced by opj_tcd_init_tile().

static INLINE OPJ_INT32 opj_int_abs ( OPJ_INT32  a )

static

Returns

Get absolute value of integer

Referenced by opj_t1_enc_clnpass(), opj_t1_enc_clnpass_step(), opj_t1_enc_refpass_step(), and opj_t1_enc_sigpass_step().

static INLINE OPJ_INT32 opj_int_ceildiv ( OPJ_INT32  a, OPJ_INT32  b  )

static

Divide an integer and round upwards.

Returns

Returns a divided by b

Referenced by opj_get_all_encoding_parameters(), opj_get_encoding_parameters(), opj_get_tile_dimensions(), opj_j2k_get_tile(), opj_j2k_read_siz(), opj_j2k_set_decode_area(), opj_j2k_setup_encoder(), opj_pi_next_cprl(), opj_pi_next_pcrl(), opj_pi_next_rpcl(), and opj_tcd_init_tile().

static INLINE OPJ_INT32 opj_int_ceildivpow2 ( OPJ_INT32  a, OPJ_INT32  b  )

static

Divide an integer by a power of 2 and round upwards.

Returns

Returns a divided by 2^b

Referenced by init_tilec(), opj_get_all_encoding_parameters(), opj_get_encoding_parameters(), opj_j2k_get_tile(), opj_j2k_set_decode_area(), and opj_tcd_init_tile().

static INLINE OPJ_INT32 opj_int_clamp ( OPJ_INT32  a, OPJ_INT32  min, OPJ_INT32  max  )

static

Clamp an integer inside an interval.

Returns

• Returns a if (min < a < max)
• Returns max if (a > max)
• Returns min if (a < min)

References max(), and min().

Referenced by opj_tcd_dc_level_shift_decode().

static INLINE OPJ_INT32 opj_int_fix_mul ( OPJ_INT32  a, OPJ_INT32  b  )

static

Multiply two fixed-precision rational numbers.

Parameters

a
b

Returns

Returns a * b

Referenced by opj_dwt_encode_1_real(), opj_mct_encode_custom(), and opj_mct_encode_real().

static INLINE OPJ_INT32 opj_int_fix_mul_t1 ( OPJ_INT32  a, OPJ_INT32  b  )

static

References T1_NMSEDEC_FRACBITS.

Referenced by opj_t1_encode_cblks().

static INLINE OPJ_INT32 opj_int_floordivpow2 ( OPJ_INT32  a, OPJ_INT32  b  )

static

Divide an integer by a power of 2 and round downwards.

Returns

Returns a divided by 2^b

Referenced by opj_get_all_encoding_parameters(), opj_get_encoding_parameters(), opj_pi_next_cprl(), opj_pi_next_pcrl(), opj_pi_next_rpcl(), and opj_tcd_init_tile().

static INLINE OPJ_INT32 opj_int_floorlog2 ( OPJ_INT32  a )

static

Get logarithm of an integer and round downwards.

Returns

Returns log2(a)

Referenced by opj_dwt_encode_stepsize(), opj_j2k_setup_encoder(), opj_t1_encode_cblk(), and opj_t2_encode_packet().

static INLINE OPJ_INT32 opj_int_max ( OPJ_INT32  a, OPJ_INT32  b  )

static

Get the maximum of two integers.

Returns

Returns a if a > b else b

Referenced by main(), opj_get_encoding_parameters(), opj_j2k_update_rates(), opj_t1_encode_cblk(), opj_t2_encode_packet(), and opj_tcd_init_tile().

static INLINE OPJ_INT32 opj_int_min ( OPJ_INT32  a, OPJ_INT32  b  )

static

Get the minimum of two integers.

Returns

Returns a if a < b else b

Referenced by opj_get_all_encoding_parameters(), opj_get_encoding_parameters(), opj_j2k_update_rates(), opj_j2k_write_poc_in_memory(), opj_t2_read_packet_header(), opj_tcd_init_tile(), opj_v4dwt_decode(), t1_init_ctxno_sc(), and t1_init_spb().

static INLINE OPJ_UINT32 opj_uint_adds ( OPJ_UINT32  a, OPJ_UINT32  b  )

static

Get the saturated sum of two unsigned integers.

Returns

Returns saturated sum of a+b

Referenced by opj_get_all_encoding_parameters(), opj_image_comp_header_update(), opj_j2k_read_siz(), and opj_tcd_init_tile().

static INLINE OPJ_UINT32 opj_uint_ceildiv ( OPJ_UINT32  a, OPJ_UINT32  b  )

static

Divide an integer and round upwards.

Returns

Returns a divided by b

Referenced by opj_image_comp_header_update(), and opj_j2k_update_rates().

static INLINE OPJ_UINT32 opj_uint_ceildivpow2 ( OPJ_UINT32  a, OPJ_UINT32  b  )

static

Divide an integer by a power of 2 and round upwards.

Returns

Returns a divided by 2^b

Referenced by opj_image_comp_header_update(), and opj_j2k_update_image_data().

static INLINE OPJ_UINT32 opj_uint_floorlog2 ( OPJ_UINT32  a )

static

Get logarithm of an integer and round downwards.

Returns

Returns log2(a)

Referenced by opj_t2_read_packet_header().

static INLINE OPJ_UINT32 opj_uint_max ( OPJ_UINT32  a, OPJ_UINT32  b  )

static

Get the maximum of two integers.

Returns

Returns a if a > b else b

Referenced by opj_get_all_encoding_parameters(), opj_image_comp_header_update(), opj_j2k_get_max_coc_size(), opj_j2k_get_max_poc_size(), opj_j2k_get_max_toc_size(), opj_t2_decode_packets(), and opj_tcd_init_tile().

static INLINE OPJ_UINT32 opj_uint_min ( OPJ_UINT32  a, OPJ_UINT32  b  )

static

Get the minimum of two integers.

Returns

Returns a if a < b else b

Referenced by opj_get_all_encoding_parameters(), opj_get_encoding_parameters(), opj_image_comp_header_update(), opj_j2k_read_poc(), opj_pi_next_cprl(), opj_pi_next_pcrl(), opj_pi_next_rpcl(), opj_pi_update_decode_poc(), opj_tcd_init_tile(), and opj_tcd_rateallocate().