diff options
Diffstat (limited to 'openjpeg/src/lib/openjp2/opj_intmath.h')
| -rw-r--r-- | openjpeg/src/lib/openjp2/opj_intmath.h | 55 |
1 files changed, 50 insertions, 5 deletions
diff --git a/openjpeg/src/lib/openjp2/opj_intmath.h b/openjpeg/src/lib/openjp2/opj_intmath.h index dc8989530..3f7934c47 100644 --- a/openjpeg/src/lib/openjp2/opj_intmath.h +++ b/openjpeg/src/lib/openjp2/opj_intmath.h @@ -82,6 +82,15 @@ static INLINE OPJ_UINT32 opj_uint_max(OPJ_UINT32 a, OPJ_UINT32 b) { } /** + Get the saturated sum of two unsigned integers + @return Returns saturated sum of a+b + */ +static INLINE OPJ_UINT32 opj_uint_adds(OPJ_UINT32 a, OPJ_UINT32 b) { + OPJ_UINT64 sum = (OPJ_UINT64)a + (OPJ_UINT64)b; + return (OPJ_UINT32)(-(OPJ_INT32)(sum >> 32)) | (OPJ_UINT32)sum; +} + +/** Clamp an integer inside an interval @return <ul> @@ -108,7 +117,7 @@ Divide an integer and round upwards @return Returns a divided by b */ static INLINE OPJ_INT32 opj_int_ceildiv(OPJ_INT32 a, OPJ_INT32 b) { - assert(b); + assert(b); return (a + b - 1) / b; } @@ -117,6 +126,7 @@ Divide an integer and round upwards @return Returns a divided by b */ static INLINE OPJ_UINT32 opj_uint_ceildiv(OPJ_UINT32 a, OPJ_UINT32 b) { + assert(b); return (a + b - 1) / b; } @@ -125,8 +135,25 @@ Divide an integer by a power of 2 and round upwards @return Returns a divided by 2^b */ static INLINE OPJ_INT32 opj_int_ceildivpow2(OPJ_INT32 a, OPJ_INT32 b) { - return (OPJ_INT32)((a + (OPJ_INT64)(1 << b) - 1) >> b); + return (OPJ_INT32)((a + ((OPJ_INT64)1 << b) - 1) >> b); } + +/** + Divide a 64bits integer by a power of 2 and round upwards + @return Returns a divided by 2^b + */ +static INLINE OPJ_INT32 opj_int64_ceildivpow2(OPJ_INT64 a, OPJ_INT32 b) { + return (OPJ_INT32)((a + ((OPJ_INT64)1 << b) - 1) >> b); +} + +/** + Divide an integer by a power of 2 and round upwards + @return Returns a divided by 2^b + */ +static INLINE OPJ_UINT32 opj_uint_ceildivpow2(OPJ_UINT32 a, OPJ_UINT32 b) { + return (OPJ_UINT32)((a + ((OPJ_UINT64)1U << b) - 1U) >> b); +} + /** Divide an integer by a power of 2 and round downwards @return Returns a divided by 2^b @@ -165,9 +192,27 @@ Multiply two fixed-precision rational numbers. @return Returns a * b */ static INLINE OPJ_INT32 opj_int_fix_mul(OPJ_INT32 a, OPJ_INT32 b) { - OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ; - temp += temp & 4096; - return (OPJ_INT32) (temp >> 13) ; +#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__INTEL_COMPILER) && defined(_M_IX86) + OPJ_INT64 temp = __emul(a, b); +#else + OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ; +#endif + temp += 4096; + assert((temp >> 13) <= (OPJ_INT64)0x7FFFFFFF); + assert((temp >> 13) >= (-(OPJ_INT64)0x7FFFFFFF - (OPJ_INT64)1)); + return (OPJ_INT32) (temp >> 13); +} + +static INLINE OPJ_INT32 opj_int_fix_mul_t1(OPJ_INT32 a, OPJ_INT32 b) { +#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__INTEL_COMPILER) && defined(_M_IX86) + OPJ_INT64 temp = __emul(a, b); +#else + OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ; +#endif + temp += 4096; + assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) <= (OPJ_INT64)0x7FFFFFFF); + assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) >= (-(OPJ_INT64)0x7FFFFFFF - (OPJ_INT64)1)); + return (OPJ_INT32) (temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) ; } /* ----------------------------------------------------------------------- */ |