"pixel perfect" hd tablet content - letterbox vs soft buttons, how?

Solar2D Android
#1

Having trouble getting screen dimensions *exactly* right for non-scaled, pixel-perfect content - particularly with the Android soft button area.

Let’s say I was building ONLY for a Nexus 7 and 10, for the purpose of this question.  I’d like it to appear exactly 1:1 on the Nexus 7 and scale up for the Nexus 10.

Corona reports 800x1280 resolution, and my config is 800x1280, letterbox, build: portrait.  So far, so good.  I have a simple test app that loads single 800x1280 “analytical” measurement png that I can QA with.

But when displayed on a Nexus 7, the actual usable screen space excludes 75px vertical for the soft button area.  A screen capture will reveal that my app is now running pillarboxed in 1205 height (1280-75) thus having an aspect-corrected width of 754 (so 23px pillars on left/right)

Nothing in display.* seems available to indicate that condition, am I missing something?

aside:  yes, I know all about “bleed” dimensions for filling letterboxes of various aspects with a background image, that is NOT the question posed here:  given a known target resolution, and a config that (in theory) exactly matches, why is content still being letterboxed, and how to resolve?

Thanks!

#2

source attached, with analytic image and info text printed on screen during run.

Check the reported values when actually running on a Nexus 7 (not simulator).  I guess my question boils down to:  is this the expected behavior on this device?  pixelWidth/Height are correctly reported (minus the soft bar), but content is squashed vertically (and expanded/pillared horizontally).  “top” status bar height (either version) seems unrelated.

Would it be “valid” to specify in config.lua that width/height = display.pixelwidth/height?

[edit]  nevermind… i think.  a bit of manual-reading gave me the clue i needed:  I wasn’t aware that ANY specification of width/height implies that content WILL be stretched to device, apparently overriding the ‘scale = “none”’ bit in my conditional portion when device dimensions are “just right, or close enough”.  simply commenting those out seems to have the desired effect:  now exact 1:1 scaling on a 800x ~1200-ish device, and scaling/letterboxing elsewhere as necessary.

#3

source attached, with analytic image and info text printed on screen during run.

Check the reported values when actually running on a Nexus 7 (not simulator).  I guess my question boils down to:  is this the expected behavior on this device?  pixelWidth/Height are correctly reported (minus the soft bar), but content is squashed vertically (and expanded/pillared horizontally).  “top” status bar height (either version) seems unrelated.

Would it be “valid” to specify in config.lua that width/height = display.pixelwidth/height?

[edit]  nevermind… i think.  a bit of manual-reading gave me the clue i needed:  I wasn’t aware that ANY specification of width/height implies that content WILL be stretched to device, apparently overriding the ‘scale = “none”’ bit in my conditional portion when device dimensions are “just right, or close enough”.  simply commenting those out seems to have the desired effect:  now exact 1:1 scaling on a 800x ~1200-ish device, and scaling/letterboxing elsewhere as necessary.