L_CreateMaskFromBitmapRgn

#include "l_bitmap.h"

L_LTDIS_API L_INT L_CreateMaskFromBitmapRgn(pBitmap, pMask, uStructSize)

pBITMAPHANDLE pBitmap;

pointer to the source bitmap handle

pBITMAPHANDLE pMask;

pointer to the destination bitmap handle

L_UINT uStructSize;

size in bytes, of the structure pointed to by pBitmap

Creates a 1-bit mask image from the region that is defined in the source bitmap.

Parameter

Description

pBitmap

Pointer to the bitmap handle referencing the source bitmap, where the region is defined.

pMask

Pointer to the bitmap handle referencing the destination bitmap, which will be updated with a 1-bit, black-and-white image, where pixels from the region are white, and all others are black.

uStructSize

Size in bytes, of the structure pointed to by pBitmap, for versioning. Use sizeof(BITMAPHANDLE).

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

A bitmap region is an area of interest within a bitmap. A bitmap can have only one region at a time, but the region can be complex, including, for example, multiple noncontiguous shapes. For more information, refer to Creating a Bitmap Region.

Required DLLs and Libraries

LTDIS

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_GetBitmapAlpha, L_SetBitmapAlpha,

 

L_SetBitmapRgnFromMask

Topics:

Defining and Using a Bitmap Region

 

Implementing Transparency

 

Saving a Region

Example

This example loads an image, sets a color region using black, and then creates a 1-bit mask image from that bitmap.

L_INT CreateMaskFromBitmapRgnExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap; /* Bitmap handle that holds the loaded bitmap */ 
   BITMAPHANDLE MaskBitmap; /* Bitmap handle that holds the mask bitmap */ 
 
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("IMAGE1.CMP")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL ); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = L_SetBitmapRgnColor (&LeadBitmap, RGB( 0,0,0 ), L_RGN_SET ); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = L_CreateMaskFromBitmapRgn(&LeadBitmap, &MaskBitmap, sizeof(BITMAPHANDLE)); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &MaskBitmap, FILE_BMP, 24, 0, NULL); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   L_FreeBitmap(&LeadBitmap); 
   L_FreeBitmap(&MaskBitmap); 
   return SUCCESS; 
} 

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