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_INTCONVERSION_HXX 25 #define INCLUDED_BASEBMP_INTCONVERSION_HXX 26 27 #include <vigra/rgbvalue.hxx> 28 #include <functional> 29 30 namespace basebmp 31 { 32 // metafunctions to retrieve correct POD from/to basebmp::Color 33 //------------------------------------------------------------------------ 34 35 /// type-safe conversion from RgbValue to packed int32 36 template< class RgbVal > struct UInt32FromRgbValue 37 { operator ()basebmp::UInt32FromRgbValue38 sal_uInt32 operator()( RgbVal const& c ) const 39 { 40 return (c[0] << 16) | (c[1] << 8) | c[2]; 41 } 42 }; 43 44 /// type-safe conversion from packed int32 to RgbValue 45 template< class RgbVal > struct RgbValueFromUInt32 46 { operator ()basebmp::RgbValueFromUInt3247 RgbVal operator()( sal_uInt32 c ) const 48 { 49 return RgbVal((c >> 16) & 0xFF, 50 (c >> 8) & 0xFF, 51 c & 0xFF); 52 } 53 }; 54 55 /// Get converter from given data type to sal_uInt32 56 template< typename DataType > struct uInt32Converter 57 { 58 typedef std::identity<DataType> to; 59 typedef std::identity<DataType> from; 60 }; 61 template< unsigned int RedIndex, 62 unsigned int GreenIndex, 63 unsigned int BlueIndex > struct uInt32Converter< 64 vigra::RGBValue< sal_uInt8, 65 RedIndex, 66 GreenIndex, 67 BlueIndex > > 68 { 69 typedef UInt32FromRgbValue< 70 vigra::RGBValue< sal_uInt8, 71 RedIndex, 72 GreenIndex, 73 BlueIndex > > 74 to; 75 typedef RgbValueFromUInt32< 76 vigra::RGBValue< sal_uInt8, 77 RedIndex, 78 GreenIndex, 79 BlueIndex > > 80 from; 81 }; 82 } 83 84 #endif /* INCLUDED_BASEBMP_INTCONVERSION_HXX */ 85