Adds a scale parameter to the image

[mz2]

• Adds an optional relative scale parameter to the image context handler.
• Also fixes a compilation error in a scenario where source is being built without Foundation.h coming in via prefix header.

[cparnot]

iOS too?

[mz2]

Damn it, no. One moment...

[mz2]

Oh, wait, but actually the iOS implementation has already scale: as part of the method selector. I passed it as a value you can include with the context handler instead of a separate argument (as I treated it similarly as an optional value -- there's an implicit scale of 1.0).

[mz2]

So technically the iOS and Mac implementations are inconsistent (on iOS there's a scale: parameter, on OSX not, and on OSX the scale is in this branch accepted as an optional context value where previously no scaling existed on OSX). I would propose an API change where scale is made indeed a value passed into the context handler instead of it being a named parameter to the method.

[cparnot]

So technically the iOS and Mac implementations are inconsistent

It's more subtle that this. On iOS, the scaling has to be done by your code based on the device scale. On OS X, the NSImage implementation takes care of it and you render in the block at scale 1 no matter what (NSImage takes care of scaling based on the screen). This scaling is only exposed for the purpose of tests. On OS X, the tests render the NSImage instance in various... NSImage with different sizes, to mimick different screens.

The "scale" you want to apply is different. It's not the screen scale, it's a custom scaling factor on top of that. Both implementations are consistent: no such factor exists at the moment. But it could be added. Also on iOS where it is not yet present in your branch ;-)

[mz2]

Ok thanks for clarifying -- then I should indeed add this scale factor to iOS too. Is there an iOS target someplace public already, or shall I make one?

[cparnot]

Is there an iOS target someplace public already, or shall I make one?

Yes. And there are tests :-)

[mz2]

zomg!