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LinearMinificationFilter.cpp

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00001 //------------------------------------------------------------------------------
00002 // Lamp : Open source game middleware
00003 // Copyright (C) 2004  Junpei Ohtani ( Email : junpee@users.sourceforge.jp )
00004 //
00005 // This library is free software; you can redistribute it and/or
00006 // modify it under the terms of the GNU Lesser General Public
00007 // License as published by the Free Software Foundation; either
00008 // version 2.1 of the License, or (at your option) any later version.
00009 //
00010 // This library is distributed in the hope that it will be useful,
00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013 // Lesser General Public License for more details.
00014 //
00015 // You should have received a copy of the GNU Lesser General Public
00016 // License along with this library; if not, write to the Free Software
00017 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00018 //------------------------------------------------------------------------------
00019 
00020 /** @file
00021  * 線形縮小フィルタ実装
00022  * @author Junpee
00023  */
00024 
00025 #include "LampBasic.h"
00026 #include "Core/Codec/LinearMinificationFilter/LinearMinificationFilter.h"
00027 
00028 namespace Lamp{
00029 
00030 //------------------------------------------------------------------------------
00031 // フィルタ
00032 void LinearMinificationFilter::filter(
00033     const Color3c* source, const DimensionI& sourceSize,
00034     Color3c* destination, const DimensionI destinationSize){
00035     // 引数チェック
00036     Assert(source != NULL);
00037     Assert(sourceSize.width != 0);
00038     Assert(sourceSize.height != 0);
00039     Assert((sourceSize.width != 1) || (sourceSize.height != 1));
00040     Assert(destination != NULL);
00041     Assert(destinationSize.width != 0);
00042     Assert(destinationSize.height != 0);
00043     Assert(((sourceSize.width / 2) == destinationSize.width) ||
00044         (sourceSize.width == 1));
00045     Assert(((sourceSize.height / 2) == destinationSize.height) ||
00046         (sourceSize.height == 1));
00047     // フィルタ
00048     for(int i = 0; i < destinationSize.height; i++){
00049         int offset = i * destinationSize.width;
00050         int sourceOffset0 = i * 2 * sourceSize.width;
00051         int sourceOffset1 = sourceOffset0 + sourceSize.width;
00052         if(sourceSize.height == 1){ sourceOffset1 -= sourceSize.width; }
00053         for(int j = 0; j < destinationSize.width; j++){
00054             int widthOffset0 = j * 2;
00055             int widthOffset1 = widthOffset0 + 1;
00056             if(sourceSize.width == 1){ widthOffset1 -= 1; }
00057             int r = ((int)source[sourceOffset0 + widthOffset0].r + 
00058                 (int)source[sourceOffset0 + widthOffset1].r + 
00059                 (int)source[sourceOffset1 + widthOffset0].r + 
00060                 (int)source[sourceOffset1 + widthOffset1].r) / 4;
00061             int g = ((int)source[sourceOffset0 + widthOffset0].g + 
00062                 (int)source[sourceOffset0 + widthOffset1].g + 
00063                 (int)source[sourceOffset1 + widthOffset0].g + 
00064                 (int)source[sourceOffset1 + widthOffset1].g) / 4;
00065             int b = ((int)source[sourceOffset0 + widthOffset0].b + 
00066                 (int)source[sourceOffset0 + widthOffset1].b + 
00067                 (int)source[sourceOffset1 + widthOffset0].b + 
00068                 (int)source[sourceOffset1 + widthOffset1].b) / 4;
00069             destination[offset + j].set(r, g, b);
00070         }
00071     }
00072 }
00073 //------------------------------------------------------------------------------
00074 // フィルタ
00075 void LinearMinificationFilter::filter(
00076     const Color4c* source, const DimensionI& sourceSize,
00077     Color4c* destination, const DimensionI destinationSize){
00078     // 引数チェック
00079     Assert(source != NULL);
00080     Assert(sourceSize.width != 0);
00081     Assert(sourceSize.height != 0);
00082     Assert((sourceSize.width != 1) || (sourceSize.height != 1));
00083     Assert(destination != NULL);
00084     Assert(destinationSize.width != 0);
00085     Assert(destinationSize.height != 0);
00086     Assert(((sourceSize.width / 2) == destinationSize.width) ||
00087         (sourceSize.width == 1));
00088     Assert(((sourceSize.height / 2) == destinationSize.height) ||
00089         (sourceSize.height == 1));
00090     // フィルタ
00091     for(int i = 0; i < destinationSize.height; i++){
00092         int offset = i * destinationSize.width;
00093         int sourceOffset0 = i * 2 * sourceSize.width;
00094         int sourceOffset1 = sourceOffset0 + sourceSize.width;
00095         if(sourceSize.height == 1){ sourceOffset1 -= sourceSize.width; }
00096         for(int j = 0; j < destinationSize.width; j++){
00097             int widthOffset0 = j * 2;
00098             int widthOffset1 = widthOffset0 + 1;
00099             if(sourceSize.width == 1){ widthOffset1 -= 1; }
00100             int r = ((int)source[sourceOffset0 + widthOffset0].r + 
00101                 (int)source[sourceOffset0 + widthOffset1].r + 
00102                 (int)source[sourceOffset1 + widthOffset0].r + 
00103                 (int)source[sourceOffset1 + widthOffset1].r) / 4;
00104             int g = ((int)source[sourceOffset0 + widthOffset0].g + 
00105                 (int)source[sourceOffset0 + widthOffset1].g + 
00106                 (int)source[sourceOffset1 + widthOffset0].g + 
00107                 (int)source[sourceOffset1 + widthOffset1].g) / 4;
00108             int b = ((int)source[sourceOffset0 + widthOffset0].b + 
00109                 (int)source[sourceOffset0 + widthOffset1].b + 
00110                 (int)source[sourceOffset1 + widthOffset0].b + 
00111                 (int)source[sourceOffset1 + widthOffset1].b) / 4;
00112             int a = ((int)source[sourceOffset0 + widthOffset0].a + 
00113                 (int)source[sourceOffset0 + widthOffset1].a + 
00114                 (int)source[sourceOffset1 + widthOffset0].a + 
00115                 (int)source[sourceOffset1 + widthOffset1].a) / 4;
00116             destination[offset + j].set(r, g, b, a);
00117         }
00118     }
00119 }
00120 //------------------------------------------------------------------------------
00121 } // End of namespace Lamp
00122 //------------------------------------------------------------------------------

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