D27805: Add a screenshot capture item and use it to test rendering

[Arjen Hiemstra]

ahiemstra created this revision.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
ahiemstra requested review of this revision.

REVISION SUMMARY
  This adds the ItemCapture item to the test runner, which can be
  used to capture images of items and compare them to a previous 
  version. It also updates the three chart tests to make use of
  this and adds the images for these tests.

TEST PLAN
  Autotests still pass.

REPOSITORY
  R1049 KQuickCharts

BRANCH
  screenshot_autotest

REVISION DETAIL
  https://phabricator.kde.org/D27805

AFFECTED FILES
  autotests/CMakeLists.txt
  autotests/ChartTestCase.qml
  autotests/ItemCapture.cpp
  autotests/ItemCapture.h
  autotests/qmltest.cpp
  autotests/screenshots/BarChart_simple.png
  autotests/screenshots/LineChart_simple.png
  autotests/screenshots/PieChart_model.png
  autotests/screenshots/PieChart_multiValue.png
  autotests/screenshots/PieChart_simple.png
  autotests/tst_BarChart.qml
  autotests/tst_LineChart.qml
  autotests/tst_PieChart.qml

To: ahiemstra
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
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