D8587: [platforms/hwcomposer] Few fixes for hwcomposer platforms

[Bhushan Shah]

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

REVISION SUMMARY
  - Actually use double layered compositing, previously both layers were
  
  of type HWC_FRAMEBUFFER, instead of 2nd layer being
  HWC_FRAMEBUFFER_TARGET. Thanks to @NotKit on telegram for pointing this
  out.
  
  - Use sourceCropf instead of sourceCrop, as sourceCrop is legacy option.

TEST PLAN
  have to test on actual device, but test_hwcomposer does have similar code.

REPOSITORY
  R108 KWin

BRANCH
  hwcomposer/fixes

REVISION DETAIL
  https://phabricator.kde.org/D8587

AFFECTED FILES
  plugins/platforms/hwcomposer/hwcomposer_backend.cpp

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