virtual L_INT LBitmap::Scramble (nColStart, nRowStart, nWidth, nHeight, uKey, uFlags)
Scrambles all or a portion of a bitmap.
Starting column in pixels (0-based).
Starting row in pixels (0-based).
Width of area to scramble in pixels.
Height of area to scramble in pixels.
Key that determines the scramble. This is an unsigned integer with a minimum value of 0 and a maximum value of 4294967295 (0xffffffff).
Flag that determines whether to encrypt or decrypt the area. Possible values are:
|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.|
|SUCCESS||The function was successful.|
|< 1||An error occurred. Refer to Return Codes.|
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:
No colors are introduced,
Color counts remain unchanged
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)
L_INT LBitmap__ScrambleExample(LBitmap *pLBitmap)
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