LBitmap::Scramble

#include "ltwrappr.h"

virtual L_INT LBitmap::Scramble (nColStart, nRowStart, nWidth, nHeight, uKey, uFlags)

L_INT32 nColStart;

starting column in pixels (0-based)

L_INT32 nRowStart;

starting row in pixels (0-based)

L_INT32 nWidth;

width of area to scramble in pixels

L_INT32 nHeight;

height of area to scramble in pixels

L_UINT32 uKey;

key that determines the scramble

L_UINT uFlags;

flag that determines whether to encrypt or decrypt the area

Scrambles all or a portion of a bitmap.

Parameter Description
nColStart Starting column in pixels (0-based).
nRowStart Starting row in pixels (0-based).
nWidth Width of area to scramble in pixels.
nHeight Height of area to scramble in pixels.
uKey Key that determines the scramble. This is an unsigned integer with a minimum value of 0 and a maximum value of 4294967295 (0xffffffff).
uFlags Flag that determines whether to encrypt or decrypt the area. Possible values are:
  Value Meaning
  SB_ENCRYPT Encrypts the area (the reverse of a decrypt).
  SB_DECRYPT Decrypts the area (the reverse of an encrypt).
  SB_INTERSECT Intersect the specified rect with the bitmap's rect.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

Scrambling a rectangular area means that the pixels in that area are shuffled around into a pseudo-random location within the area.

Some properties of shuffling:

Given the same encrypt area (defined by nColStart, nRowStart, nWidth, nHeight) and the same key, setting (uFlags = SB_ENCRYPT) is the inverse of (uFlags = SB_DECRYPT)

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.

See Also

Functions:

LAnnEncrypt::GetEncryptOptions, LAnnEncrypt::SetEncryptOptions, Class Members

Topics:

Annotation Functions: Object Properties

 

Implementing Annotations

 

Automated User Interface for Annotations

 

Annotation Functions: Creating and Deleting Annotations

 

Types of Annotations

Example

L_INT LBitmap__ScrambleExample(LBitmap *pLBitmap) 
{ 
   if (!pLBitmap->IsAllocated()) 
      return FAILURE; 
   return pLBitmap->Scramble(0, 
   0, 
   pLBitmap->GetWidth()/2, 
   pLBitmap->GetHeight()/2, 
   123, 
   SB_ENCRYPT); 
}

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