utilities/CxImage/ximalyr.cpp

   1 // xImaLyr.cpp : Layers functions\r
   2 /* 21/04/2003 v1.00 - Davide Pizzolato - www.xdp.it\r
   3  * CxImage version 6.0.0 02/Feb/2008\r
   4  */\r
   5 \r
   6 #include "ximage.h"\r
   7 \r
   8 #if CXIMAGE_SUPPORT_LAYERS\r
   9 \r
  10 ////////////////////////////////////////////////////////////////////////////////\r
  11 /**\r
  12  * If the object is an internal layer, GetParent return its parent in the hierarchy.\r
  13  */\r
  14 CxImage* CxImage::GetParent() const\r
  15 {\r
  16         return info.pParent;\r
  17 }\r
  18 ////////////////////////////////////////////////////////////////////////////////\r
  19 /**\r
  20  * Number of layers allocated directly by the object.\r
  21  */\r
  22 long CxImage::GetNumLayers() const\r
  23 {\r
  24         return info.nNumLayers;\r
  25 }\r
  26 ////////////////////////////////////////////////////////////////////////////////\r
  27 /**\r
  28  * Creates an empty layer. If position is less than 0, the new layer will be placed in the last position\r
  29  */\r
  30 bool CxImage::LayerCreate(long position)\r
  31 {\r
  32         if ( position < 0 || position > info.nNumLayers ) position = info.nNumLayers;\r
  33 \r
  34         CxImage** ptmp = new CxImage*[info.nNumLayers + 1];\r
  35         if (ptmp==0) return false;\r
  36 \r
  37         int i=0;\r
  38         for (int n=0; n<info.nNumLayers; n++){\r
  39                 if (position == n){\r
  40                         ptmp[n] = new CxImage();\r
  41                         i=1;\r
  42                 }\r
  43                 ptmp[n+i]=ppLayers[n];\r
  44         }\r
  45         if (i==0) ptmp[info.nNumLayers] = new CxImage();\r
  46 \r
  47         if (ptmp[position]){\r
  48                 ptmp[position]->info.pParent = this;\r
  49         } else {\r
  50                 free(ptmp);\r
  51                 return false;\r
  52         }\r
  53 \r
  54         info.nNumLayers++;\r
  55         delete [] ppLayers;\r
  56         ppLayers = ptmp;\r
  57         return true;\r
  58 }\r
  59 ////////////////////////////////////////////////////////////////////////////////\r
  60 /**\r
  61  * Deletes a layer. If position is less than 0, the last layer will be deleted\r
  62  */\r
  63 bool CxImage::LayerDelete(long position)\r
  64 {\r
  65         if ( position >= info.nNumLayers ) return false;\r
  66         if ( position < 0) position = info.nNumLayers - 1;\r
  67         if ( position < 0) return false;\r
  68 \r
  69         if (info.nNumLayers>1){\r
  70 \r
  71                 CxImage** ptmp = new CxImage*[info.nNumLayers - 1];\r
  72                 if (ptmp==0) return false;\r
  73 \r
  74                 int i=0;\r
  75                 for (int n=0; n<info.nNumLayers; n++){\r
  76                         if (position == n){\r
  77                                 delete ppLayers[n];\r
  78                                 i=1;\r
  79                         }\r
  80                         ptmp[n]=ppLayers[n+i];\r
  81                 }\r
  82 \r
  83                 info.nNumLayers--;\r
  84                 delete [] ppLayers;\r
  85                 ppLayers = ptmp;\r
  86 \r
  87         } else {\r
  88                 delete ppLayers[0];\r
  89                 delete [] ppLayers;\r
  90                 ppLayers = 0;\r
  91                 info.nNumLayers = 0;\r
  92         }\r
  93         return true;\r
  94 }\r
  95 ////////////////////////////////////////////////////////////////////////////////\r
  96 void CxImage::LayerDeleteAll()\r
  97 {\r
  98         if (ppLayers) { \r
  99                 for(long n=0; n<info.nNumLayers;n++){ delete ppLayers[n]; }\r
 100                 delete [] ppLayers; ppLayers=0; info.nNumLayers = 0;\r
 101         }\r
 102 }\r
 103 ////////////////////////////////////////////////////////////////////////////////\r
 104 /**\r
 105  * Returns a pointer to a layer. If position is less than 0, the last layer will be returned\r
 106  */\r
 107 CxImage* CxImage::GetLayer(long position)\r
 108 {\r
 109         if ( ppLayers == NULL) return NULL;\r
 110         if ( info.nNumLayers == 0) return NULL;\r
 111         if ( position >= info.nNumLayers ) return NULL;\r
 112         if ( position < 0) position = info.nNumLayers - 1;\r
 113         return ppLayers[position];\r
 114 }\r
 115 ////////////////////////////////////////////////////////////////////////////////\r
 116 #endif //CXIMAGE_SUPPORT_LAYERS\r