L_DlgHistogram

#include "l_bitmap.h"

L_LTDLG_API L_INT L_DlgHistogram(hWndOwner, pDlgParams)

Displays the Histogram dialog box.

Parameters

L_HWND hWndOwner

Handle of the window which owns the dialog.

LPHISTOGRAMDLGPARAMS pDlgParams

Pointer to a HISTOGRAMDLGPARAMS structure to be updated with the values entered by the user, through the dialog. Set members of this structure, before calling this function, to set the dialogs initial values.

Returns

Value Meaning
SUCCESS_DLG_CLOSE The dialog exits successfully after pressing the "Close" button.
< 1 An error occurred. Refer to Return Codes.

Comments

The Histogram dialog.

Required DLLs and Libraries

See Also

Functions

Topics

Example

// 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; 
} 
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