Add support for retina displays to sk_app.
The macOS view system is in "big pixel" units, so translate these
into "physical pixel" units.
To compensate, add sk_app::Window::scaleFactor() which returns the
scale factor. The viewer app is modified to apply the inverse of
this scale factor to the current zoom level.
Change-Id: I4fac066a230c87793fc5a0e5a582d60d25e46e7b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/361558
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
11 files changed