[forms-devel] Intent of Image.IsOpaque

[Jason Smith]

IsOpaque is really a performance optimization. It is safe for a backend to ignore. A rendering engine can take certain shortcuts if it knows an image is opaque. That is all.

From: forms-devel [mailto:forms-devel-bounces at lists.dot.net] On Behalf Of ???
Sent: Thursday, August 11, 2016 7:57 PM
To: forms-devel at lists.dot.net
Subject: [forms-devel] Intent of Image.IsOpaque


Hi, all

Who is known intent of Image.IsOpaque?

It only implemented in iOS, others platform renderers ignore this property.

Anyway, Currently Xamarin document describe this property like below
https://developer.xamarin.com/api/property/Xamarin.Forms.Image.IsOpaque/<https://na01.safelinks.protection.outlook.com/?url=https%3a%2f%2fdeveloper.xamarin.com%2fapi%2fproperty%2fXamarin.Forms.Image.IsOpaque%2f&data=01%7c01%7cjas%40microsoft.com%7c371abcf60fc24a65ae4008d3c25c457d%7c72f988bf86f141af91ab2d7cd011db47%7c1&sdata=Xx3kTYzcxzWU6N51CxryQKdyT17iKIcXnvtD5vPp%2f4M%3d>
"If true, you'll be able to see through transparent parts of the image."
According to this guide, If want show partially transparent image, IsOpaque should be set true.
Is that right?

As I know, IsOpaque property was mapped iOS UIView.opaque
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIView_Class/#//apple_ref/occ/instp/UIView/opaque<https://na01.safelinks.protection.outlook.com/?url=https%3a%2f%2fdeveloper.apple.com%2flibrary%2fios%2fdocumentation%2fUIKit%2fReference%2fUIView_Class%2f%23%2f%2fapple_ref%2focc%2finstp%2fUIView%2fopaque&data=01%7c01%7cjas%40microsoft.com%7c371abcf60fc24a65ae4008d3c25c457d%7c72f988bf86f141af91ab2d7cd011db47%7c1&sdata=Ca%2fv7J0WSrIZ7tC9gBFLyzLfN0fcI4RSpttHEcLo30s%3d>
"You should always set the value of this property to NO if the view is fully or partially transparent."
According to this guide, If want show partially transparent image, opaque should be set false(NO)

Which is right?
Please, anyone answer this question.

Thanks!
Seungkeun Lee
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