Better resampling of images with AGKTransformPixelMapper about aggeometrykit HOT 5 OPEN

@snown What do you think? Is this something you would like to have a look at?

from aggeometrykit.

Sorry for the delay, yeah I'll take a crack at this. I'm up against a deadline right now, but I may have a couple extra cycles soon. Feel free to assign.

Thanks.

from aggeometrykit.

Cool :) It will definitely be boosting the quality of the output which again will be a huge improvement of this crop-to-quad-feature!

Should we use the accelerate-framework? :)

from aggeometrykit.

Hey @snown, I've been thinking. iOS 7 has been around for quite some time now. Before iOS 7 we couldn't render layers/uiview with 3d transforms to images. With iOS 7 that became possible. Our resampling is inferior to UIKit's version. It is now possible to do something like this

// 1. Create a imageview
UIImageView *imageView = [UIImageView new];

// 2. Apply a transform
imageView.transform = ...;

// 3. Apply image
imageView.image = image;

// 4. Position it
imageView.layer.position = ...;

// 3. Add it to a container
UIImageView *container = [UIImageView new];
[container addSubview:imageView];

// 6. Render that container
CGSize size = ...;
CGRect rect = ...;
CGFloat scale = ...;
UIGraphicsBeginImageContextWithOptions(size, NO, scale);
[container drawViewHierarchyInRect:rect afterScreenUpdates:YES];
UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

// 7. Crop the result
UIImage *final = [correctedImage imageByCroppingToRect:destinationRect];

Maybe we could update that imageByCroppingToQuad:destinationSize: to do something along these lines instead? I don't know how to calculate the proper transform, maybe you do?

from aggeometrykit.

Useful stuff! We can throw our resampler out the window! Anyone have time to do a PR for that?
http://flexmonkey.blogspot.no/2016/04/a-look-at-perspective-transform.html

from aggeometrykit.