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, 190 insertions, 0 deletions

diff --git a/slideshow/source/engine/activities/interpolation.hxx b/slideshow/source/engine/activities/interpolation.hxx
new file mode 100644
index 000000000..155456ed5
--- /dev/null
+++ b/slideshow/source/engine/activities/interpolation.hxx
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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/.
+ *
+ * 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 .
+ */
+
+#ifndef INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_INTERPOLATION_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_INTERPOLATION_HXX
+
+#include <basegfx/utils/lerp.hxx>
+#include <osl/diagnose.h>
+#include <rtl/ustring.hxx>
+
+#include <rgbcolor.hxx>
+#include <hslcolor.hxx>
+
+namespace basegfx
+{
+    namespace utils
+    {
+        // Interpolator specializations
+        // ============================
+
+        // NOTE: generic lerp is included from lerp.hxx. Following
+        // are some specializations for various
+        // not-straight-forward-interpolatable types
+
+        /// Specialization for RGBColor, to employ color-specific interpolator
+        template<> ::slideshow::internal::RGBColor lerp< ::slideshow::internal::RGBColor >(
+            const ::slideshow::internal::RGBColor& rFrom,
+            const ::slideshow::internal::RGBColor& rTo,
+            double                                 t     )
+        {
+            return interpolate( rFrom, rTo, t );
+        }
+
+        /// Specialization also for sal_Int16, although this code should not be called
+        template<> sal_Int16 lerp< sal_Int16 >( const sal_Int16&,
+                                                const sal_Int16&    rTo,
+                                                double                     )
+        {
+            OSL_FAIL( "lerp<sal_Int16> called" );
+            return rTo;
+        }
+
+        /// Specialization also for string, although this code should not be called
+        template<> OUString lerp< OUString >( const OUString&,
+                                                            const OUString&  rTo,
+                                                            double                       )
+        {
+            OSL_FAIL( "lerp<OUString> called" );
+            return rTo;
+        }
+
+        /// Specialization also for bool, although this code should not be called
+        template<> bool lerp< bool >( const bool&,
+                                      const bool&   rTo,
+                                      double             )
+        {
+            OSL_FAIL( "lerp<bool> called" );
+            return rTo;
+        }
+    }
+}
+
+namespace slideshow
+{
+    namespace internal
+    {
+        template< typename ValueType > struct Interpolator
+        {
+            ValueType operator()( const ValueType&  rFrom,
+                                  const ValueType&  rTo,
+                                  double            t ) const
+            {
+                return basegfx::utils::lerp( rFrom, rTo, t );
+            }
+        };
+
+        /// Specialization for HSLColor, to employ color-specific interpolator
+        template<> struct Interpolator< HSLColor >
+        {
+            explicit Interpolator( bool bCCW ) :
+                mbCCW( bCCW )
+            {
+            }
+
+            HSLColor operator()( const HSLColor&    rFrom,
+                                 const HSLColor&    rTo,
+                                 double             t ) const
+            {
+                return interpolate( rFrom, rTo, t, mbCCW );
+            }
+
+        private:
+            /// When true: interpolate counter-clockwise
+            const bool mbCCW;
+        };
+
+
+        /** Generic linear interpolator
+
+            @tpl ValueType
+            Must have operator+ and operator* defined, and should
+            have value semantics.
+
+            @param rInterpolator
+            Interpolator to use for lerp
+
+            @param nFrame
+            Must be in the [0,nTotalFrames) range
+
+            @param nTotalFrames
+            Total number of frames. Should be greater than zero.
+        */
+        template< typename ValueType > ValueType lerp( const Interpolator< ValueType >& rInterpolator,
+                                                       const ValueType&                 rFrom,
+                                                       const ValueType&                 rTo,
+                                                       sal_uInt32                       nFrame,
+                                                       ::std::size_t                    nTotalFrames )
+        {
+            // TODO(P1): There's a nice HAKMEM trick for that
+            // nTotalFrames > 1 condition below
+
+            // for 1 and 0 frame animations, always take end value
+            const double nFraction( nTotalFrames > 1 ? double(nFrame)/(nTotalFrames-1) : 1.0 );
+
+            return rInterpolator( rFrom, rTo, nFraction );
+        }
+
+        /// Specialization for non-interpolatable constants/enums
+        template<> sal_Int16 lerp< sal_Int16 >( const Interpolator< sal_Int16 >&    /*rInterpolator*/,
+                                                const sal_Int16&                    rFrom,
+                                                const sal_Int16&                    rTo,
+                                                sal_uInt32                          nFrame,
+                                                ::std::size_t                       nTotalFrames )
+        {
+            // until one half of the total frames are over, take from value.
+            // after that, take to value.
+            // For nFrames not divisible by 2, we prefer to over from, which
+            // also neatly yields to for 1 frame activities
+            return nFrame < nTotalFrames/2 ? rFrom : rTo;
+        }
+
+        /// Specialization for non-interpolatable strings
+        template<> OUString lerp< OUString >( const Interpolator< OUString >&  /*rInterpolator*/,
+                                                            const OUString&                  rFrom,
+                                                            const OUString&                  rTo,
+                                                            sal_uInt32                              nFrame,
+                                                            ::std::size_t                           nTotalFrames )
+        {
+            // until one half of the total frames are over, take from value.
+            // after that, take to value.
+            // For nFrames not divisible by 2, we prefer to over from, which
+            // also neatly yields to for 1 frame activities
+            return nFrame < nTotalFrames/2 ? rFrom : rTo;
+        }
+
+        /// Specialization for non-interpolatable bools
+        template<> bool lerp< bool >( const Interpolator< bool >&   /*rInterpolator*/,
+                                      const bool&                   bFrom,
+                                      const bool&                   bTo,
+                                      sal_uInt32                    nFrame,
+                                      ::std::size_t                 nTotalFrames )
+        {
+            // until one half of the total frames are over, take from value.
+            // after that, take to value.
+            // For nFrames not divisible by 2, we prefer to over from, which
+            // also neatly yields to for 1 frame activities
+            return nFrame < nTotalFrames/2 ? bFrom : bTo;
+        }
+    }
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_INTERPOLATION_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */