Bug 25806 - CoreImage missing bindings for iOS 8 "reduction" category of filters
Summary: CoreImage missing bindings for iOS 8 "reduction" category of filters
Status: RESOLVED INVALID
Alias: None
Product: iOS
Classification: Xamarin
Component: Xamarin.iOS.dll ()
Version: master
Hardware: PC Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2015-01-07 17:12 UTC by Larry O'Brien
Modified: 2015-01-08 08:53 UTC (History)
2 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Status:
RESOLVED INVALID

Description Larry O'Brien 2015-01-07 17:12:09 UTC
Although `CIAreaHistogram` and `CIHistogramDisplayFilter` are bound, it appears that the following filters in Apple's "CICategoryReduction" are missing bindings:

    CIAreaAverage
    CIRowAverage
    CIColumnAverage
    CIAreaMaximum
    CIAreaMinimum
    CIAreaMaximumAlpha
    CIAreaMinimumAlpha
Comment 1 Sebastien Pouliot 2015-01-07 22:38:57 UTC
Are you sure they are available on iOS ? 

I see them documented to be Mac only [1] and we have tests that detect what Apple "exports" and match that to our strongly bound versions. 

Now it might be that the test is incomplete (and that those requires extra steps to be enumerated)...

[1] https://developer.apple.com/library/ios/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html#//apple_ref/doc/uid/TP30000136-SW184
Comment 2 Larry O'Brien 2015-01-07 22:46:02 UTC
No, I'm not sure, but I *do* know that CIAreaHistogram and CIHistogramDisplayFilter are available (and working). Those types, too, seem to be only documented as being available on OS X at the Apple Library page you link. For instance, under CIAreaHistogram, it lists "Availability Available in OS X v10.5 and later."
Comment 3 Sebastien Pouliot 2015-01-07 22:52:29 UTC
Yes, Apple doc is kind of bad regarding which filters are available. The published API diff never list them and even the tracking doc [2] is not very helpful (but does list some mistakes).

FWIW both `CIAreaHistogram` and `CIHistogramDisplayFilter` were added because our introspection tests "found" them :-) which is why I was curious if you had found any resource stating something else (unreported) was available (as it's our only line of defence ;-)

I'll have a look if we can create valid instance of those types (just to be 100% sure) but I do hope our tests are correct :) 

[2] https://developer.apple.com/library/mac/documentation/GraphicsImaging/Reference/CoreImageFilterReference/cifilterref_revhx.html
Comment 4 Larry O'Brien 2015-01-07 22:54:44 UTC
I just wrote my own test confirming they are not available to Swift either. So I think you are correct...
Comment 5 Sebastien Pouliot 2015-01-08 08:53:24 UTC
ok :-)

I don't recall if I already reported those two cases to Apple (they don't email you back, or even your request) when you give feedback, so I did it again.