L_DlgHistogram

// Example 1 
// Example to illustrate using a bitmap to show histogram charts 
L_INT DlgHistogramFirstExample(HWND hWnd,pBITMAPHANDLE pBitmap) 
{ 
   L_INT nRet; 
   HISTOGRAMDLGPARAMS DlgParam ; 
 
   memset ( &DlgParam, 0, sizeof ( HISTOGRAMDLGPARAMS ) ) ;  
 
   DlgParam.uStructSize       = sizeof ( HISTOGRAMDLGPARAMS ) ; 
   DlgParam.pBitmap           = pBitmap ; 
   DlgParam.crBlueChannelPen  = RGB ( 0, 0, 255 ) ; 
   DlgParam.crGreenChannelPen = RGB ( 0, 255, 0 ) ; 
   DlgParam.crRedChannelPen   = RGB ( 255, 0, 0 ) ; 
   DlgParam.crMasterPen       = RGB ( 0, 0, 0 ) ; 
   DlgParam.uDlgFlags         = DLG_HISTOGRAM_SHOW_VIEWSTYLE | 
                                DLG_HISTOGRAM_USERPENCOLORS ; 
   nRet = L_DlgInit ( DLG_INIT_COLOR ) ; 
   if(nRet != SUCCESS && nRet != ERROR_DLG_ALREADYINITIATED) 
      return nRet; 
   nRet = L_DlgHistogram ( hWnd, &DlgParam ) ; 
   if(nRet < 1) 
      return nRet; 
   nRet = L_DlgFree () ; 
   if(nRet != SUCCESS) 
      return nRet; 
   return SUCCESS; 
} 
 
// Example 2 
// Example to illustrate using histogram tables to show histogram charts 
L_VOID GetBitmapHistogram(pBITMAPHANDLE pBitmap, 
                          L_UINT        uChannel, 
                          L_UINT        uCount, 
                          L_UINT64**    lppHistogram 
) 
{ 
   // allocate histogram array 
   if ( ISGRAY( pBitmap ) ) 
   { 
      switch ( pBitmap->BitsPerPixel ) 
      { 
      case 1: 
      case 4: 
      case 8 : 
         { 
            uCount = 256 ; 
         } 
         break ; 
 
      case 12: 
         { 
            uCount = 4096 ;// maximum 
 
            // is there any way to decrease buffer size? 
            if ( !L_IsSupportLocked( L_SUPPORT_MEDICAL ) ) 
            { 
               L_INT LowBit, HighBit ; 
 
               if ( SUCCESS == L_GetMinMaxBits( pBitmap, &LowBit, &HighBit, 0 ) ) 
               { 
                  uCount = (DWORD)1 << ( HighBit - LowBit + 1 ) ; 
               } 
            } 
            else 
            { 
               return ; 
            } 
         } 
 
         break ; 
 
      case 16: 
         { 
            uCount = 65536 ; 
 
            // is there any way to decrease buffer size? 
            if ( !L_IsSupportLocked( L_SUPPORT_MEDICAL ) ) 
            { 
               L_INT LowBit, HighBit ; 
 
               if ( SUCCESS == L_GetMinMaxBits( pBitmap, &LowBit, &HighBit, 0 ) ) 
               { 
                  uCount = (DWORD)1 << ( HighBit - LowBit + 1 ) ; 
               } 
            } 
            else 
            { 
               return ; 
            } 
         } 
         break ; 
 
      default: 
         return ; 
      } 
   } 
   else 
   { 
      switch ( pBitmap->BitsPerPixel ) 
      { 
      case 1: 
      case 2: 
      case 3: 
      case 4: 
      case 5: 
      case 6: 
      case 7: 
      case 8: 
      case 16: 
      case 24: 
      case 32: 
         { 
            uCount = 256 ; 
         } 
         break ; 
 
      case 48: 
      case 64: 
         { 
            uCount = 65536 ; 
         } 
         break ; 
 
      default: 
         return ; 
      } 
   } 
 
   *lppHistogram = (L_UINT64 *)malloc ( uCount * sizeof ( L_UINT64 ) ) ; 
 
   // read histogram 
   L_GetBitmapHistogram( pBitmap, *lppHistogram, uCount, uChannel ) ; 
} 
 
L_INT DlgHistogramSecondExample(HWND hWnd, pBITMAPHANDLE pBitmap) 
{ 
   L_INT nRet; 
   HISTOGRAMDLGPARAMS DlgParam ; 
   L_UINT64* pTempPtr = NULL; 
 
   memset ( &DlgParam, 0, sizeof ( HISTOGRAMDLGPARAMS ) ) ; 
   DlgParam.uStructSize = sizeof ( HISTOGRAMDLGPARAMS ) ; 
 
   pTempPtr = DlgParam.puMasterHistogram; 
   GetBitmapHistogram(pBitmap, 
                      CHANNEL_MASTER, 
                      DlgParam.uMasterHistogramLen, 
                      &pTempPtr) ; 
 
   pTempPtr = DlgParam.puRedHistogram ; 
   GetBitmapHistogram(pBitmap, 
                      CHANNEL_RED, 
                      DlgParam.uRedHistogramLen, 
                      &pTempPtr) ; 
 
   pTempPtr = DlgParam.puGreenHistogram; 
   GetBitmapHistogram(pBitmap, 
                      CHANNEL_GREEN, 
                      DlgParam.uGreenHistogramLen, 
                      &pTempPtr) ; 
 
   pTempPtr = DlgParam.puBlueHistogram; 
   GetBitmapHistogram(pBitmap, 
                      CHANNEL_BLUE, 
                      DlgParam.uBlueHistogramLen, 
                      &pTempPtr) ; 
 
   DlgParam.pBitmap           = pBitmap ; 
   DlgParam.crBlueChannelPen  = RGB ( 0, 0, 255 ) ; 
   DlgParam.crGreenChannelPen = RGB ( 0, 255, 0 ) ; 
   DlgParam.crRedChannelPen   = RGB ( 255, 0, 0 ) ; 
   DlgParam.crMasterPen       = RGB ( 0, 0, 0 ) ; 
   DlgParam.uDlgFlags         = DLG_HISTOGRAM_SHOW_VIEWSTYLE | 
                                DLG_HISTOGRAM_USERPENCOLORS  ; 
 
   nRet = L_DlgInit ( DLG_INIT_COLOR ) ; 
   if(nRet != SUCCESS && nRet != ERROR_DLG_ALREADYINITIATED) 
      return nRet; 
   nRet = L_DlgHistogram ( hWnd, &DlgParam ) ; 
   if(nRet < 1) 
      return nRet; 
   nRet = L_DlgFree () ; 
   if(nRet != SUCCESS) 
      return nRet; 
 
   free ( DlgParam.puMasterHistogram ) ; 
   free ( DlgParam.puRedHistogram ) ; 
   free ( DlgParam.puGreenHistogram ) ; 
   free ( DlgParam.puBlueHistogram ) ; 
   return SUCCESS; 
}