D8627: [platforms/drm] Properly adjust cursor position on a rotated output

[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 refactors the way how the cursor position on a screen is
  calculated. It is changed to a matrix multiplication with the
  adjustments for the rotated screen just being additional steps added to
  the matrix.
  
  With this calculation I got correct positions for all variants of
  scaled, rotated and differently positioned outputs.

REPOSITORY
  R108 KWin

BRANCH
  drm-cursor-position-rotate

REVISION DETAIL
  https://phabricator.kde.org/D8627

AFFECTED FILES
  plugins/platforms/drm/drm_output.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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