D8379: PDF: Support the new poppler renderToImage with update callback

[Albert Astals Cid]

aacid created this revision.
Restricted Application added a subscriber: Okular.
Restricted Application added a project: Okular.

REVISION SUMMARY
  This way pages that take more than 500ms to render get updated every so often so that the
  user can see that the program didn't hang, it's just that it's taking long to render

REPOSITORY
  R223 Okular

BRANCH
  updateCallback (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D8379

AFFECTED FILES
  core/document.cpp
  core/generator.cpp
  core/generator.h
  core/generator_p.h
  generators/poppler/CMakeLists.txt
  generators/poppler/config-okular-poppler.h.cmake
  generators/poppler/generator_pdf.cpp

To: aacid
Cc: #okular, aacid
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