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Issue 2.3


Unroll the loops

Optimizing your code

Issue: 2.3 (December/January 2003)
Article Description: No description available.
Article Length (in bytes): 7,563
Starting Page Number: 46
Article Number: 2323
Resource File(s):

Download Icon 2323.zip Updated: 2013-03-11 19:07:57

Related Link(s): None

Excerpt of article text...

In one of my previous columns, Stego Part II, I mentionned a way of doing some things faster, especially by using MemoryBlocks instead of strings. Following this, there were requests for an article on optimization. I won't be able to cover everything in the space alloted here, but I'll give you a couple of improvements you can use in your code. We'll see how to improve square-angle image rotation with a few tricks that'll speed things up to nine times faster!

Image Rotation: 90 degrees that seem to take forever

We've all dealt with image rotation, at least at square angle: +/- 90 degrees, 180 degrees, horizontal or vertical mirror. This is not extremely difficult to achieve, but doing it fast is trickier. Let's see first a "standard" 90 degree rotation routine:

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