utilities/CxImage/ximalyr.cpp

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