Algorithm to resize image and maintain aspect ratio to fit iPhone

Question

I\'m creating a web service for an iPhone app to interact with.

When my client uploads images server-side, I want my php script to resize the image, whilst m

Answer 1

Any one coming to this page from Google looking for ASPECT FILL not ASPECT FIT, it is simply a matter of switching the ratio selection code i.e:

Jim's answer:

resizeRatio = Min(wRatio, hRatio); //Aspect Fit

becomes

resizeRatio = Max(wRatio, hRatio); //Aspect Fill

DevProd's answer:

float ratio = ratioW < ratioH?ratioW:ratioH; //Aspect Fit

becomes

float ratio = ratioW > ratioH?ratioW:ratioH; //Aspect Fill