Mir

Physical "screen" size reported by the X11 backend is same as pixel count, fixing dpi to 25.4

Bug #1596051 reported by Gerry Boland on 2016-06-24
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Canonical System Image
Medium
Unassigned
Mir
Fix Released
Medium
Andreas Pokorny
mir (Ubuntu)
Undecided
Unassigned

Bug Description

Hey, I'm testing mir on X11.

Qt is calculating the DPI value based on information Mir gives it about the screen. It uses either the DPI value Mir calculates, or the physical size of the screen to calculate DPI itself.

But the X11 backend reports the physical size equal to the number of pixels, so 1mm = 1 pixel. This makes the DPI calculation always return 25.4dpi, which causes Qt to render tiny fonts.

Could you please mock the physical screen size to return something so that DPI becomes something more sensible?

Related branches

Gerry Boland (gerboland) on 2016-06-24
summary: Physical "screen" size reported by the X11 backend is same as pixel
- count, making the dpi calculation ~23
+ count, fixing dpi to 25.4

Yeah, we should simply get the pixel density from the default screen..

Changed in mir:
status: New → Confirmed
Changed in mir:
assignee: nobody → Andreas Pokorny (andreas-pokorny)
status: Confirmed → In Progress
Mir CI Bot (mir-ci-bot) wrote :

Fix committed into lp:mir at revision None, scheduled for release in mir, milestone 0.24.0

Changed in mir:
status: In Progress → Fix Committed
Changed in mir:
milestone: none → 0.24.0
importance: Undecided → Medium
Changed in canonical-devices-system-image:
status: New → Fix Committed
importance: Undecided → Medium
milestone: none → 13
Launchpad Janitor (janitor) wrote :
Download full text (5.7 KiB)

This bug was fixed in the package mir - 0.24.0+16.10.20160815.3-0ubuntu1

---------------
mir (0.24.0+16.10.20160815.3-0ubuntu1) yakkety; urgency=medium

  * New upstream release 0.24.0 (https://launchpad.net/mir/+milestone/0.24.0)
    - ABI summary:
      . mirclient ABI unchanged at 9
      . mirserver ABI bumped to 41
      . mircommon ABI unchanged at 6
      . mirplatform ABI bumped to 12
      . mirprotobuf ABI unchanged at 3
      . mirplatformgraphics ABI bumped to 10
      . mirclientplatform ABI unchanged at 5
      . mirinputplatform ABI unchanged at 5
    - Enhancements:
      . Added a new tool 'mirvanity' which can use a high speed video camera
        to measure client-to-screen latency.
      . Added (build-time) support for desktop full OpenGL servers (disabled
        by default in favor of GLESv2).
      . Introduced new buffer semantics (NBS) and enabled it by default.
      . Avoided using libmirserver in mir_demo_standalone_render_overlays,
        making bringup traces less cluttered.
      . Removed TilingWindowManager from example servers.
      . Added two new mir_*_performance_test tools that are run as part of
        'mir_performance_tests'.
      . Added pointer confinement to the client API.
      . Added new platform supporting software EGLStreams.
      . Added an input platform that the nested server can use.
      . Allow configuration of the application_not_responding_detector
      . Handle server-side keymapping using XKBMapper.
      . Remove the offscreen display.
      . Add callback option to notify shells that the server is about to stop.
      . Add logging for ANativeWindow events on Android.
    - Bugs fixed:
      . usage of std:call_once in mirclient causes TLS collisions with some
        android devices (LP: #1599867)
      . AltGr not working on external keyboards (LP: #1565236)
      . [regression] unity8 fails to start when built with 0.24 series (lp:mir)
        (LP: #1597717)
      . CI failure in MirSurfaceVisibilityEvent.exposed_received_when_surface_
        raised_over_occluding_surface [called twice - over-saturated and active]
        (LP: #1556045)
      . package-built mir_demo_server does not start on device (LP: #1577357)
      . During surface creation, first stream in spec becomes default stream.
        (LP: #1577967)
      . mouse is getting stuck on a phantom edge (LP: #1580774)
      . [testsfail] in MirSurfaceVisibilityEvent.exposed_received_when_surface_
        raised_over_occluding_surface [never called] (LP: #1581385)
      . [enhancement] Add support for full OpenGL compositing (LP: #1420581)
      . [testsfail] ServerSignal.terminate_handler_is_called_for_SIGINT|SIGTERM
        (LP: #1570353)
      . [testsfail] ClientLatency.triple_buffered_client_has_less_than_two_
        frames_latency (LP: #1576690)
      . [testsfail] NestedServer.when_monitor_plugged_in_client_is_notified_of_
        new_display_configuration (LP: #1576760)
      . mir server crashed in what(): drmModeMoveCursor failed (returned -13)
        (LP: #1579630)
      . mirtest-dev is hard to use as the objects used are compiled with LTO
        (LP: #1583536)
      . [testsfail] ClientLogging.repo...

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Changed in mir (Ubuntu):
status: New → Fix Released
Changed in mir:
status: Fix Committed → Fix Released
Changed in canonical-devices-system-image:
status: Fix Committed → Fix Released
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