In This Topic ▼

L_HolesRemovalBitmapRgn

Summary

Removes all the holes in a region.

Syntax

#include "l_bitmap.h"

L_LTIMGEFX_API L_INT L_HolesRemovalBitmapRgn(pBitmap, uFlags)

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle referencing the bitmap to be changed.

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function is designed to work on bitmaps that have a region. It removes the holes from the bitmaps region. If this function is used with a bitmap that does not have a region, the "Invalid Parameter" error is returned.

To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available in the Document and Medical Imaging toolkits.

This function supports 32-bit grayscale images.

Required DLLs and Libraries

LTIMGEFX
For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64, Linux.

Example

This example loads a bitmap, defines a region on it after converting to 1bit black and white, and applies the
holes removal filter to remove small white or black segments

L_INT HolesRemovalBitmapRgnExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap; 
 
   /* Load the bitmap, keeping the bits per pixel of the file */ 
   nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("IMAGE1.CMP")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /*convert to 1-bit black and white*/ 
   nRet = L_ColorResBitmap(&LeadBitmap, &LeadBitmap, sizeof(BITMAPHANDLE), 1, CRF_FIXEDPALETTE, NULL, NULL, 0, NULL, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /*Set the region around the black or white region according to (0,0) color*/ 
   nRet = L_SetBitmapRgnMagicWand(&LeadBitmap, 0, 0, RGB(0, 0, 0), RGB(25, 25, 25), L_RGN_SET); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /*Remove holes around the black or white regions*/ 
   nRet = L_HolesRemovalBitmapRgn(&LeadBitmap, 0); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /* Fill the region with black color*/ 
   L_FillBitmap(&LeadBitmap, RGB(0, 0, 0)); 
   L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL); 
 
   //free bitmap 
   if (LeadBitmap.Flags.Allocated) 
      L_FreeBitmap(&LeadBitmap); 
 
   return SUCCESS; 
}