xamarin/Xamarin.Forms

[UWP] Button image is not scaled properly

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#2,787 opened on May 21, 2018

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Description

Description

Originally reported in bugzilla https://bugzilla.xamarin.com/show_bug.cgi?id=60369.

Steps to Reproduce

  1. Start the attached project.
  2. If the app starts on a 100% scaled monitor it's all well. You can move the app to a 200% monitor and it scales up well again.
  3. If the app starts on a 200% monitor, the button image is over-scaled.

Expected Behavior

Button image should show "as usual".

Actual Behavior

Button image is over-scaled.

Basic Information

  • Version with issue: 3.0
  • Last known good version: N/A
  • IDE: VS2017
  • Platform Target Frameworks:
    • UWP: 16299

Screenshots

100% monitor 100 200% monitor 200 Android device screenshot_20180521-124421

Reproduction Link

asd.zip

Contributor guide

Research direction
Investigate the image scaling logic in Xamarin.Forms for UWP, particularly how it handles different monitor DPI settings. Look at the Button renderer and image loading code for UWP platform.
Tech stack
csharp
Domain
mobiledesktop
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Xamarin.FormsUWP
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70