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 #ifndef INCLUDED_BASEBMP_INTCONVERSION_HXX 23 #define INCLUDED_BASEBMP_INTCONVERSION_HXX 24 25 #include <vigra/rgbvalue.hxx> 26 #include <functional> 27 28 namespace basebmp 29 { 30 // metafunctions to retrieve correct POD from/to basebmp::Color 31 //------------------------------------------------------------------------ 32 33 // type-safe conversion from RgbValue to packed int32 34 template< class RgbVal > struct UInt32FromRgbValue 35 { 36 sal_uInt32 operator()( RgbVal const& c ) const 37 { 38 return (c[0] << 16) | (c[1] << 8) | c[2]; 39 } 40 }; 41 42 // type-safe conversion from packed int32 to RgbValue 43 template< class RgbVal > struct RgbValueFromUInt32 44 { 45 RgbVal operator()( sal_uInt32 c ) const 46 { 47 return RgbVal((c >> 16) & 0xFF, 48 (c >> 8) & 0xFF, 49 c & 0xFF); 50 } 51 }; 52 53 // Get converter from given data type to sal_uInt32 54 template< typename DataType > struct uInt32Converter 55 { 56 typedef std::identity<DataType> to; 57 typedef std::identity<DataType> from; 58 }; 59 template< unsigned int RedIndex, 60 unsigned int GreenIndex, 61 unsigned int BlueIndex > struct uInt32Converter< 62 vigra::RGBValue< sal_uInt8, 63 RedIndex, 64 GreenIndex, 65 BlueIndex > > 66 { 67 typedef UInt32FromRgbValue< 68 vigra::RGBValue< sal_uInt8, 69 RedIndex, 70 GreenIndex, 71 BlueIndex > > 72 to; 73 typedef RgbValueFromUInt32< 74 vigra::RGBValue< sal_uInt8, 75 RedIndex, 76 GreenIndex, 77 BlueIndex > > 78 from; 79 }; 80 } 81 82 #endif /* INCLUDED_BASEBMP_INTCONVERSION_HXX */ 83 84 /* vim: set noet sw=4 ts=4: */ 85