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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifndef INCLUDED_TOOLS_HELPERS_HXX
#define INCLUDED_TOOLS_HELPERS_HXX
#include <sal/config.h>
#include <sal/types.h>
#include <o3tl/safeint.hxx>
#include <cassert>
#include <type_traits>
template<typename T>
inline
typename std::enable_if<
std::is_signed<T>::value || std::is_floating_point<T>::value, long >::type
MinMax(T nVal, long nMin, long nMax)
{
assert(nMin <= nMax);
if (nVal >= nMin)
{
if (nVal <= nMax)
return static_cast<long>(nVal);
else
return nMax;
}
else
{
return nMin;
}
}
template<typename T>
inline
typename std::enable_if<
std::is_unsigned<T>::value, long >::type
MinMax(T nVal, long nMin, long nMax)
{
assert(nMin <= nMax);
if (nMax < 0)
{
return nMax;
}
else
{
if (nMin < 0 || nVal >= static_cast<unsigned long>(nMin))
{
if (nVal <= static_cast<unsigned long>(nMax))
return static_cast<long>(nVal);
else
return nMax;
}
else
{
return nMin;
}
}
}
inline sal_uInt32 AlignedWidth4Bytes(sal_uInt32 nWidthBits)
{
if (nWidthBits > SAL_MAX_UINT32 - 31)
nWidthBits = SAL_MAX_UINT32;
else
nWidthBits += 31;
return (nWidthBits >> 5) << 2;
}
inline long FRound( double fVal )
{
return fVal > 0.0 ? static_cast<long>( fVal + 0.5 ) : -static_cast<long>( -fVal + 0.5 );
}
/** Convert 100th-mm to twips
A twip is 1/20 of a point, one inch is equal to 72 points, and
one inch is 2,540 100th-mm.
Thus:
twips = n * 72 / 2,540 / 20
= n * 72 / 127
Adding 63 (half of 127) fixes truncation issues in int arithmetic.
This formula is (n>=0) ? (n*72+63) / 127 : (n*72-63) / 127
*/
inline sal_Int64 sanitiseMm100ToTwip(sal_Int64 n)
{
if (n >= 0)
{
if (o3tl::checked_multiply<sal_Int64>(n, 72, n) || o3tl::checked_add<sal_Int64>(n, 63, n))
n = SAL_MAX_INT64;
}
else
{
if (o3tl::checked_multiply<sal_Int64>(n, 72, n) || o3tl::checked_sub<sal_Int64>(n, 63, n))
n = SAL_MIN_INT64;
}
return n / 127; // 127 is 2,540 100th-mm divided by 20pts
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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