source/Irrlicht/CGUIImageList.cpp

   1 // This file is part of the "Irrlicht Engine".\r
   2 // written by Reinhard Ostermeier, reinhard@nospam.r-ostermeier.de\r
   3 // modified by Thomas Alten\r
   4 \r
   5 #include "CGUIImageList.h"\r
   6 \r
   7 \r
   8 namespace irr\r
   9 {\r
  10 namespace gui\r
  11 {\r
  12 \r
  13 //! constructor\r
  14 CGUIImageList::CGUIImageList( video::IVideoDriver* driver )\r
  15  :      Driver( driver ),\r
  16         Texture( 0 ),\r
  17         ImageCount( 0 ),\r
  18         ImageSize( 0, 0 ),\r
  19         ImagesPerRow( 0 ),\r
  20         UseAlphaChannel( false )\r
  21 {\r
  22         #ifdef _DEBUG\r
  23         setDebugName( "CGUIImageList" );\r
  24         #endif\r
  25 \r
  26         if( Driver )\r
  27         {\r
  28                 Driver->grab();\r
  29         }\r
  30 }\r
  31 \r
  32 \r
  33 \r
  34 //! destructor\r
  35 CGUIImageList::~CGUIImageList()\r
  36 {\r
  37         if( Driver )\r
  38         {\r
  39                 Driver->drop();\r
  40         }\r
  41 \r
  42         if( Texture )\r
  43         {\r
  44                 Texture->drop();\r
  45         }\r
  46 }\r
  47 \r
  48 \r
  49 //! Creates the image list from texture.\r
  50 bool CGUIImageList::createImageList(video::ITexture* texture,\r
  51                                 core::dimension2d<s32> imageSize,\r
  52                                 bool useAlphaChannel)\r
  53 {\r
  54         if( !texture )\r
  55         {\r
  56                 return false;\r
  57         }\r
  58 \r
  59         Texture = texture;\r
  60         Texture->grab();\r
  61 \r
  62         ImageSize = imageSize;\r
  63 \r
  64         ImagesPerRow = Texture->getSize().Width / ImageSize.Width;\r
  65         ImageCount = ImagesPerRow * Texture->getSize().Height / ImageSize.Height;\r
  66 \r
  67         UseAlphaChannel = useAlphaChannel;\r
  68 \r
  69         return true;\r
  70 }\r
  71 \r
  72 //! Draws an image and clips it to the specified rectangle if wanted\r
  73 void CGUIImageList::draw( s32 index, const core::position2d<s32>& destPos,\r
  74                 const core::rect<s32>* clip /*= 0*/ )\r
  75 {\r
  76         core::rect<s32> sourceRect;\r
  77 \r
  78         if( !Driver || index < 0 || index >= ImageCount )\r
  79         {\r
  80                 return;\r
  81         }\r
  82 \r
  83         sourceRect.UpperLeftCorner.X = ( index % ImagesPerRow ) * ImageSize.Width;\r
  84         sourceRect.UpperLeftCorner.Y = ( index / ImagesPerRow ) * ImageSize.Height;\r
  85         sourceRect.LowerRightCorner.X = sourceRect.UpperLeftCorner.X + ImageSize.Width;\r
  86         sourceRect.LowerRightCorner.Y = sourceRect.UpperLeftCorner.Y + ImageSize.Height;\r
  87 \r
  88         Driver->draw2DImage( Texture, destPos, sourceRect, clip,\r
  89                                                                 video::SColor( 255, 255, 255, 255 ), UseAlphaChannel );\r
  90 }\r
  91 \r
  92 } // end namespace gui\r
  93 } // end namespace irr\r