How to get pixel data from a UIImage (Cocoa Touch) or CGImage (Core Graphics)?
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by Olie
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Published on 2009-01-15T19:30:26Z
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2010/03/13
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I have a UIImage (Cocoa Touch). From that, I'm happy to get a CGImage or anything else you'd like that's available. I'd like to write this function:
- (int)getRGBAFromImage:(UIImage *)image atX:(int)xx andY:(int)yy {
// [...]
// What do I want to read about to help
// me fill in this bit, here?
// [...]
int result = (red << 24) | (green << 16) | (blue << 8) | alpha;
return result;
}
Thanks!
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