Core Graphics: Is it better to up-sample or down-sample images when drawing into a rect?
Core Graphics: Is it better to up-sample or down-sample images when drawing into a rect?
- Subject: Core Graphics: Is it better to up-sample or down-sample images when drawing into a rect?
- From: Jeff Szuhay <email@hidden>
- Date: Wed, 24 Aug 2016 01:23:00 -0700
I’m using a bunch of layers to draw images to, compose them, and then draw into a viewRect
with
CGContextDrawLayerInRect( viewContext, viewRect, myLayer);
Of course, I’m trying to pick the most reasonable size for my layers. I currently use 1024x1024
but could easily make them 512x512 or 768x768.
So my question is, “Is is more efficient to draw the layer into a smaller viewRect (down-sample)
or into a larger ViewRect (up-sample)?”
Or does it even matter?
I have an internal goal of using less than 1% of the CPU for my 1 second image drawing so it is
actually quite important for me to know.
TIA
Jeff Szuhay
a.k.a email@hidden <mailto:email@hidden>
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