D8668: [platforms/drm] Fix cursor hotspot for inverted landscape rotation

[Martin Flöser]

graesslin created this revision.
graesslin added reviewers: KWin, Plasma.
Restricted Application added a project: KWin.
Restricted Application added subscribers: kwin, plasma-devel.

REVISION SUMMARY
  This change fixes the hotspot calculation by introducing a dedicated
  matrix to map the hotspot.
  
  To better test the hotspot a small test application is added. The app
  renders a red point at the cursor position and uses a cross for cursor
  with the hotspot position being transparent. So if KWin renders the
  cursor at the correct position a red point is visible in the center of
  the cross. The test app supports several cursor hotspot positions:
  
  - center (default)
  - top left
  - top right
  - bottom right
  - bottom left
  
  To switch between the variants press the space key.

TEST PLAN
  Rotated screen, used test app to verify the hotspot is
  correct. Also scaled display, still correct

REPOSITORY
  R108 KWin

BRANCH
  drm-cursor-hotspot

REVISION DETAIL
  https://phabricator.kde.org/D8668

AFFECTED FILES
  plugins/platforms/drm/drm_output.cpp
  tests/CMakeLists.txt
  tests/cursorhotspottest.cpp

To: graesslin, #kwin, #plasma
Cc: plasma-devel, kwin, bwowk, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
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