L_ClearBitmap

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#include "l_bitmap.h"

L_LTKRN_API L_INT L_ClearBitmap(pBitmap)

/* pointer to the bitmap handle */

Sets all bits to 0 in the specified bitmap, making it a black bitmap.

Parameter	Description
pBitmap	Pointer to the bitmap handle referencing the bitmap to clear.

Returns

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

Comments

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

Regions are not supported on the Windows CE platform.

Required DLLs and Libraries

LTKRN

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.

See Also

Functions:	L_AccessBitmap, L_ReleaseBitmap, L_GetBitmapRow,
	L_PutBitmapRow, L_GetBitmapRowCol,
	L_PutBitmapRowCol, L_GetPixelColor,
	L_PutPixelColor, L_ClearNegativePixels
Topics:	Raster Image Functions: Getting and Setting Pixel Values

Example

For complete sample code, refer to the COMPCB example. This example loads a bitmap and clears it.

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName


 L_INT ClearBitmapExample(L_VOID)
{
   L_INT nRet;
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle to hold the loaded image. */

   /* 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;
   /* Clear the bitmap */
   nRet = L_ClearBitmap(&LeadBitmap);
   if(nRet != SUCCESS)
      return nRet;

   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL);
   if(nRet != SUCCESS)
      return nRet;
   if(LeadBitmap.Flags.Allocated)
      L_FreeBitmap(&LeadBitmap);  

   return SUCCESS;
}