Horizontally Flip a One Bit Bitmap Line

Posted by roygbiv on Stack Overflow See other posts from Stack Overflow or by roygbiv
Published on 2010-05-05T21:28:49Z Indexed on 2010/05/05 22:38 UTC
Read the original article Hit count: 182

Filed under:

.NET

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c#

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vb.net

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bitmap

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algorithm

I'm looking for an algorithm to flip a 1 Bit Bitmap line horizontally. Remember these lines are DWORD aligned!

I'm currently unencoding an RLE stream to an 8 bit-per-pixel buffer, then re-encoding to a 1 bit line, however, I would like to try and keep it all in the 1 bit space in an effort to increase its speed. Profiling indicates this portion of the program to be relatively slow compared to the rest.

Example line (Before Flip):

FF FF FF FF 77 AE F0 00

Example line (After Flip):

F7 5E EF FF FF FF F0 00

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