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[Feature] TilesBrush Surface can be DPI Aware #4150
Labels
accessibility ♿
brush 🖌️
feature request 📬
A request for new changes to improve functionality
improvements ✨
Describe the problem this feature would solve
If you create a
TilesBrush
with a URI to an image that are context aware, then it only loads the normal scaled image instead of the one for the specific DPI of your monitor.This is because
SurfaceLoader.LoadImageAsync
that is used is using the underlyingCanvasBitmap.LoadAsync
method from Win2D on theuri
which bypasses the UWP contextual loading system. Therefore, the developer can't provide up-res textures for larger DPI monitors in order to keep the design aesthetic the same for a tiled background in the app.Describe the solution
I believe there are a few improvements we can make here to help with this:
ResourceContext
that can retrieve the context aware resource based on a uri (also see theToAppxUri
helpers too, as this slightly inverse), we may want a coupleResourceCandidate
which can be used to get a stream or storageFile from.SurfaceLoader
whendpiMode
is aDisplayDpi*
setting to use theResourceContext
instead for an ms-appx uriTo Investigate Also: May open another issue, but want to investigate adding an attached property for image, which can hook into the
MapChanged
event and automatically reload an image on context change (scale, theme, etc...) - not sure if that would work for aRequestedTheme
change like we do on a sample-page with an app or only the system level change.Describe alternatives you've considered
After exposing
Horizontal/VerticalAlignmentRatio
on theCompositionSurfaceBrush
forTilesBrush
in my testing, that alone was not sufficient with any other settings to get this scenario to work as expected.Additional context & Screenshots
Current at 150 DPI:
At 100 DPI and expected result for both:
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