1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23 24 #ifndef INCLUDED_BASEBMP_ACCESSOR_HXX 25 #define INCLUDED_BASEBMP_ACCESSOR_HXX 26 27 #include <vigra/numerictraits.hxx> 28 29 namespace basebmp 30 { 31 32 /** Standard accessor type 33 34 Accesses the iterator values the standard way (i.e. via 35 *operator()/operator[]) 36 */ 37 template<typename ValueType> class StandardAccessor 38 { 39 public: 40 typedef ValueType value_type; 41 42 // ------------------------------------------------------- 43 44 template< class Iterator > operator ()(Iterator const & i) const45 value_type operator()(Iterator const& i) const 46 { 47 return *i; 48 } 49 50 template< class Iterator, class Difference > operator ()(Iterator const & i,Difference const & diff) const51 value_type operator()(Iterator const& i, Difference const& diff) const 52 { 53 return i[diff]; 54 } 55 56 // ------------------------------------------------------- 57 58 template< typename V, class Iterator > set(V const & value,Iterator const & i) const59 void set(V const& value, Iterator const& i) const 60 { 61 *i = vigra::detail::RequiresExplicitCast<value_type>::cast(value); 62 } 63 64 template< typename V, class Iterator, class Difference > set(V const & value,Iterator const & i,Difference const & diff) const65 void set(V const& value, Iterator const& i, Difference const& diff) const 66 { 67 i[diff] = vigra::detail::RequiresExplicitCast<value_type>::cast(value); 68 } 69 }; 70 71 //----------------------------------------------------------------------------- 72 73 /** Non-standard accessor type 74 75 Uses getter/setter methods at the given iterator type, to access 76 the underlying values. 77 */ 78 template<typename ValueType> class NonStandardAccessor 79 { 80 public: 81 typedef ValueType value_type; 82 83 // ------------------------------------------------------- 84 85 template< class Iterator > operator ()(Iterator const & i) const86 value_type operator()(Iterator const& i) const 87 { 88 return i.get(); 89 } 90 91 template< class Iterator, class Difference > operator ()(Iterator const & i,Difference const & diff) const92 value_type operator()(Iterator const& i, Difference const& diff) const 93 { 94 return i.get(diff); 95 } 96 97 // ------------------------------------------------------- 98 99 template< typename V, class Iterator > set(V const & value,Iterator const & i) const100 void set(V const& value, Iterator const& i) const 101 { 102 i.set( vigra::detail::RequiresExplicitCast<value_type>::cast(value) ); 103 } 104 105 template< typename V, class Iterator, class Difference > set(V const & value,Iterator const & i,Difference const & diff) const106 void set(V const& value, Iterator const& i, Difference const& diff) const 107 { 108 i.set( vigra::detail::RequiresExplicitCast<value_type>::cast(value), 109 diff ); 110 } 111 }; 112 113 } // namespace basebmp 114 115 #endif /* INCLUDED_BASEBMP_ACCESSOR_HXX */ 116