Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 209 insertions, 0 deletions

diff --git a/include/basegfx/numeric/ftools.hxx b/include/basegfx/numeric/ftools.hxx
new file mode 100644
index 000000000..14deaa059
--- /dev/null
+++ b/include/basegfx/numeric/ftools.hxx
@@ -0,0 +1,209 @@
+/* -*- 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <rtl/math.h>
+#include <cmath>
+#include <math.h>
+#include <basegfx/basegfxdllapi.h>
+#include <limits>
+#include <algorithm>
+
+
+// fTools defines
+
+namespace basegfx
+{
+    /** Round double to nearest integer
+
+        @return the nearest integer
+    */
+    inline sal_Int32 fround( double fVal )
+    {
+        if (fVal >= std::numeric_limits<sal_Int32>::max() - .5)
+            return std::numeric_limits<sal_Int32>::max();
+        else if (fVal <= std::numeric_limits<sal_Int32>::min() + .5)
+            return std::numeric_limits<sal_Int32>::min();
+        return fVal > 0.0 ? static_cast<sal_Int32>( fVal + .5 ) : static_cast<sal_Int32>( fVal - .5 );
+    }
+
+    /** Round double to nearest integer
+
+        @return the nearest 64 bit integer
+    */
+    inline sal_Int64 fround64( double fVal )
+    {
+        return fVal > 0.0 ? static_cast<sal_Int64>( fVal + .5 ) : -static_cast<sal_Int64>( -fVal + .5 );
+    }
+
+    /** Prune a small epsilon range around zero.
+
+        Use this method e.g. for calculating scale values. There, it
+        is usually advisable not to set a scaling to 0.0, because that
+        yields singular transformation matrices.
+
+        @param fVal
+        An arbitrary, but finite and valid number
+
+        @return either fVal, or a small value slightly above (when
+        fVal>0) or below (when fVal<0) zero.
+     */
+    inline double pruneScaleValue( double fVal )
+    {
+        if(fVal < 0.0)
+            return std::min(fVal, -0.00001);
+        else
+            return std::max(fVal, 0.00001);
+    }
+
+    /** Convert value from degrees to radians
+     */
+    template <int DegMultiple = 1> constexpr double deg2rad( double v )
+    {
+        // divide first, to get exact values for v being a multiple of
+        // 90 degrees
+        return v / (90.0 * DegMultiple) * M_PI_2;
+    }
+
+    /** Convert value radians to degrees
+     */
+    template <int DegMultiple = 1> constexpr double rad2deg( double v )
+    {
+        // divide first, to get exact values for v being a multiple of
+        // pi/2
+        return v / M_PI_2 * (90.0 * DegMultiple);
+    }
+
+    /** Snap v to nearest multiple of fStep, from negative and
+        positive side.
+
+        Examples:
+
+        snapToNearestMultiple(-0.1, 0.5) = 0.0
+        snapToNearestMultiple(0.1, 0.5) = 0.0
+        snapToNearestMultiple(0.25, 0.5) = 0.0
+        snapToNearestMultiple(0.26, 0.5) = 0.5
+     */
+    BASEGFX_DLLPUBLIC double snapToNearestMultiple(double v, const double fStep);
+
+    /** Snap v to the range [0.0 .. fWidth] using modulo
+     */
+    double snapToZeroRange(double v, double fWidth);
+
+    /** Snap v to the range [fLow .. fHigh] using modulo
+     */
+    double snapToRange(double v, double fLow, double fHigh);
+
+    /** return fValue with the sign of fSignCarrier, thus evtl. changed
+    */
+    inline double copySign(double fValue, double fSignCarrier)
+    {
+#ifdef _WIN32
+        return _copysign(fValue, fSignCarrier);
+#else
+        return copysign(fValue, fSignCarrier);
+#endif
+    }
+
+    /** RotateFlyFrame3: Normalize to range defined by [0.0 ... fRange[, independent
+        if v is positive or negative.
+
+        Examples:
+
+        normalizeToRange(0.5, -1.0) = 0.0
+        normalizeToRange(0.5, 0.0) = 0.0
+        normalizeToRange(0.5, 1.0) = 0.5
+        normalizeToRange(-0.5, 1.0) = 0.5
+        normalizeToRange(-0.3, 1.0) = 0.7
+        normalizeToRange(-0.7, 1.0) = 0.3
+        normalizeToRange(3.5, 1.0) = 0.5
+        normalizeToRange(3.3, 1.0) = 0.3
+        normalizeToRange(3.7, 1.0) = 0.7
+        normalizeToRange(-3.5, 1.0) = 0.5
+        normalizeToRange(-3.3, 1.0) = 0.7
+        normalizeToRange(-3.7, 1.0) = 0.3
+     */
+    BASEGFX_DLLPUBLIC double normalizeToRange(double v, const double fRange);
+
+    namespace fTools
+    {
+        /// Get threshold value for equalZero and friends
+        inline double getSmallValue() { return 0.000000001f; }
+
+        /// Compare against small value
+        template <typename T, std::enable_if_t<std::is_floating_point_v<T>, int> = 0>
+        inline bool equalZero(const T& rfVal)
+        {
+            return (fabs(rfVal) <= getSmallValue());
+        }
+
+        /// Compare against given small value
+        template <typename T, std::enable_if_t<std::is_floating_point_v<T>, int> = 0>
+        inline bool equalZero(const T& rfVal, const T& rfSmallValue)
+        {
+            return (fabs(rfVal) <= rfSmallValue);
+        }
+
+        template <typename T, std::enable_if_t<std::is_floating_point_v<T>, int> = 0>
+        inline bool equal(T const& rfValA, T const& rfValB)
+        {
+            // changed to approxEqual usage for better numerical correctness
+            return rtl_math_approxEqual(rfValA, rfValB);
+        }
+
+        template <typename T, std::enable_if_t<std::is_floating_point_v<T>, int> = 0>
+        inline bool equal(const T& rfValA, const T& rfValB, const T& rfSmallValue)
+        {
+            return (fabs(rfValA - rfValB) <= rfSmallValue);
+        }
+
+        template <typename T, std::enable_if_t<std::is_floating_point_v<T>, int> = 0>
+        inline bool less(const T& rfValA, const T& rfValB)
+        {
+            return (rfValA < rfValB && !equal(rfValA, rfValB));
+        }
+
+        template <typename T, std::enable_if_t<std::is_floating_point_v<T>, int> = 0>
+        inline bool lessOrEqual(const T& rfValA, const T& rfValB)
+        {
+            return (rfValA < rfValB || equal(rfValA, rfValB));
+        }
+
+        template <typename T, std::enable_if_t<std::is_floating_point_v<T>, int> = 0>
+        inline bool more(const T& rfValA, const T& rfValB)
+        {
+            return (rfValA > rfValB && !equal(rfValA, rfValB));
+        }
+
+        template <typename T, std::enable_if_t<std::is_floating_point_v<T>, int> = 0>
+        inline bool moreOrEqual(const T& rfValA, const T& rfValB)
+        {
+            return (rfValA > rfValB || equal(rfValA, rfValB));
+        }
+
+        template <typename T, std::enable_if_t<std::is_floating_point_v<T>, int> = 0>
+        inline bool betweenOrEqualEither(const T& rfValA, const T& rfValB, const T& rfValC)
+        {
+            return (rfValA > rfValB && rfValA < rfValC) || equal(rfValA, rfValB) || equal(rfValA, rfValC);
+        }
+    };
+} // end of namespace basegfx
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */