}
return a;
}
+
+/**
+Clamp an integer inside an interval
+@return
+<ul>
+<li>Returns a if (min < a < max)
+<li>Returns max if (a > max)
+<li>Returns min if (a < min)
+</ul>
+*/
+static INLINE OPJ_INT64 opj_int64_clamp(OPJ_INT64 a, OPJ_INT64 min,
+ OPJ_INT64 max)
+{
+ if (a < min) {
+ return min;
+ }
+ if (a > max) {
+ return max;
+ }
+ return a;
+}
+
/**
@return Get absolute value of integer
*/
static INLINE OPJ_UINT32 opj_uint_ceildiv(OPJ_UINT32 a, OPJ_UINT32 b)
{
assert(b);
- return (a + b - 1) / b;
+ return (OPJ_UINT32)(((OPJ_UINT64)a + b - 1) / b);
+}
+
+/**
+Divide an integer and round upwards
+@return Returns a divided by b
+*/
+static INLINE OPJ_UINT32 opj_uint64_ceildiv_res_uint32(OPJ_UINT64 a,
+ OPJ_UINT64 b)
+{
+ assert(b);
+ return (OPJ_UINT32)((a + b - 1) / b);
}
/**
{
return a >> b;
}
+
+/**
+Divide an integer by a power of 2 and round downwards
+@return Returns a divided by 2^b
+*/
+static INLINE OPJ_UINT32 opj_uint_floordivpow2(OPJ_UINT32 a, OPJ_UINT32 b)
+{
+ return a >> b;
+}
+
/**
Get logarithm of an integer and round downwards
@return Returns log2(a)
return (OPJ_INT32)(temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) ;
}
+/**
+Addition two signed integers with a wrap-around behaviour.
+Assumes complement-to-two signed integers.
+@param a
+@param b
+@return Returns a + b
+*/
+static INLINE OPJ_INT32 opj_int_add_no_overflow(OPJ_INT32 a, OPJ_INT32 b)
+{
+ void* pa = &a;
+ void* pb = &b;
+ OPJ_UINT32* upa = (OPJ_UINT32*)pa;
+ OPJ_UINT32* upb = (OPJ_UINT32*)pb;
+ OPJ_UINT32 ures = *upa + *upb;
+ void* pures = &ures;
+ OPJ_INT32* ipres = (OPJ_INT32*)pures;
+ return *ipres;
+}
+
+/**
+Subtract two signed integers with a wrap-around behaviour.
+Assumes complement-to-two signed integers.
+@param a
+@param b
+@return Returns a - b
+*/
+static INLINE OPJ_INT32 opj_int_sub_no_overflow(OPJ_INT32 a, OPJ_INT32 b)
+{
+ void* pa = &a;
+ void* pb = &b;
+ OPJ_UINT32* upa = (OPJ_UINT32*)pa;
+ OPJ_UINT32* upb = (OPJ_UINT32*)pb;
+ OPJ_UINT32 ures = *upa - *upb;
+ void* pures = &ures;
+ OPJ_INT32* ipres = (OPJ_INT32*)pures;
+ return *ipres;
+}
+
/* ----------------------------------------------------------------------- */
/*@}*/