2e83a62f15
Change-Id: I98b2d90c8345f07010f6defd82557188d5cd35c7 Reviewed-on: https://gerrit.libreoffice.org/64808 Tested-by: Jenkins Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
132 lines
3.0 KiB
C++
132 lines
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef INCLUDED_TOOLS_HELPERS_HXX
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#define INCLUDED_TOOLS_HELPERS_HXX
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#include <sal/config.h>
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#include <sal/types.h>
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#include <o3tl/safeint.hxx>
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#include <cassert>
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#include <type_traits>
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template<typename T>
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inline
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typename std::enable_if<
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std::is_signed<T>::value || std::is_floating_point<T>::value, long >::type
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MinMax(T nVal, long nMin, long nMax)
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{
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assert(nMin <= nMax);
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if (nVal >= nMin)
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{
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if (nVal <= nMax)
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return static_cast<long>(nVal);
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else
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return nMax;
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}
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else
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{
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return nMin;
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}
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}
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template<typename T>
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inline
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typename std::enable_if<
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std::is_unsigned<T>::value, long >::type
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MinMax(T nVal, long nMin, long nMax)
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{
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assert(nMin <= nMax);
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if (nMax < 0)
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{
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return nMax;
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}
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else
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{
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if (nMin < 0 || nVal >= static_cast<unsigned long>(nMin))
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{
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if (nVal <= static_cast<unsigned long>(nMax))
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return static_cast<long>(nVal);
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else
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return nMax;
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}
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else
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{
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return nMin;
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}
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}
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}
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inline sal_uInt32 AlignedWidth4Bytes(sal_uInt32 nWidthBits)
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{
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if (nWidthBits > SAL_MAX_UINT32 - 31)
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nWidthBits = SAL_MAX_UINT32;
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else
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nWidthBits += 31;
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return (nWidthBits >> 5) << 2;
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}
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inline long FRound( double fVal )
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{
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return fVal > 0.0 ? static_cast<long>( fVal + 0.5 ) : -static_cast<long>( -fVal + 0.5 );
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}
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//valid range: (-180,180]
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template <typename T>
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[[nodiscard]] inline typename std::enable_if<std::is_signed<T>::value, T>::type
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NormAngle180(T angle)
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{
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while (angle <= -180)
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angle += 360;
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while (angle > 180)
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angle -= 360;
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return angle;
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}
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//valid range: [0,360)
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template <typename T> [[nodiscard]] inline T NormAngle360(T angle)
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{
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while (angle < 0)
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angle += 360;
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while (angle >= 360)
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angle -= 360;
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return angle;
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}
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/** Convert 100th-mm to twips
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A twip is 1/20 of a point, one inch is equal to 72 points, and
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one inch is 2,540 100th-mm.
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Thus:
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twips = n * 72 / 2,540 / 20
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= n * 72 / 127
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Adding 63 (half of 127) fixes truncation issues in int arithmetic.
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This formula is (n>=0) ? (n*72+63) / 127 : (n*72-63) / 127
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*/
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inline sal_Int64 sanitiseMm100ToTwip(sal_Int64 n)
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{
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if (n >= 0)
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{
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if (o3tl::checked_multiply<sal_Int64>(n, 72, n) || o3tl::checked_add<sal_Int64>(n, 63, n))
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n = SAL_MAX_INT64;
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}
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else
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{
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if (o3tl::checked_multiply<sal_Int64>(n, 72, n) || o3tl::checked_sub<sal_Int64>(n, 63, n))
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n = SAL_MIN_INT64;
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}
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return n / 127; // 127 is 2,540 100th-mm divided by 20pts
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}
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#endif
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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