D8600: Render GL Window decorations at the correct scale

[David Edmundson]

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

REVISION SUMMARY
  Under wayland we support high DPI putting by putting a separation
  between the logical co-ordinate system and the resolution of rendered
  assets.
  
  When a window is on a high DPI screen, we should render at the higher
  resolution.
  
  Like the window scaling this handles any combination of a 2x scaled
  decoration being rendered on a 1x screen or vice versa.
  
  ---
  
  This patch is a bit different from the other scaling stuff. We have to
  generate the quads *before* we have an updated texture with the new
  scale. This means the scale isn't attached to the buffer like elsewhere.
  
  That's why I added a property in TopLevel so there's still one canonical
  source and things can't get out of sync.
  
  BUG: 384765

TEST PLAN
  Crystal clear breeze and oxygen decos on my @2x display
  Drag windows to attached @1x display, things still look OK when across 2 screens
  Changing the scale of a screen updated the decos instantly

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8600

AFFECTED FILES
  decorations/decorationrenderer.cpp
  plugins/scenes/opengl/scene_opengl.cpp
  plugins/scenes/qpainter/scene_qpainter.cpp
  plugins/scenes/xrender/scene_xrender.cpp
  scene.cpp
  scene.h
  toplevel.cpp
  toplevel.h

To: davidedmundson, #plasma
Cc: plasma-devel, kwin, #kwin, bwowk, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.kde.org/pipermail/plasma-devel/attachments/20171101/6535c507/attachment-0001.html>