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Scaling up a bitmap?

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I've been trying to find a tutorial with google on how to scale up a bitmap myself. I dont want to use hardware or any api or lib, just do it myself. I found a lot of code but very little of it is explained. Anyone could help with this? A link to a tutorial or something would be greatly appreciated. Edit : I DO understand how to stretch, thanks to an old demo tutorial but I cant seem to find how to do any sort of filtering to get more descent results, like bilinear filtering or bspline filtering. Doing a search on google for with the work bilinear filtering in it is bound to give you an insane lot of garbage. I found one or two but I didnt grasp the concepts behind them, since they were a bit short. [edited by - Dark Rain on August 30, 2002 11:11:11 PM]

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