1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifndef INCLUDED_SLIDESHOW_INTERPOLATION_HXX
#define INCLUDED_SLIDESHOW_INTERPOLATION_HXX
#include <basegfx/tools/lerp.hxx>
namespace basegfx
{
namespace tools
{
// 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_ENSURE( false,
"lerp<sal_Int16> called" );
return rTo;
}
/// Specialization also for string, although this code should not be called
template<> ::rtl::OUString lerp< ::rtl::OUString >( const ::rtl::OUString&,
const ::rtl::OUString& rTo,
double )
{
OSL_ENSURE( false,
"lerp<::rtl::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_ENSURE( false,
"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::tools::lerp( rFrom, rTo, t );
}
};
/// Specialization for HSLColor, to employ color-specific interpolator
template<> struct Interpolator< HSLColor >
{
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 divisable 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<> ::rtl::OUString lerp< ::rtl::OUString >( const Interpolator< ::rtl::OUString >& /*rInterpolator*/,
const ::rtl::OUString& rFrom,
const ::rtl::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 divisable 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 divisable 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_INTERPOLATION_HXX */
|
