D9328: Add support for cancellable image rendering and text extraction

[Albert Astals Cid]

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

REVISION SUMMARY
  Only supported by the pdf backend if using poppler >= 0.63
  
  Sadly had to change the generator API

TEST PLAN
  Needs https://bugs.freedesktop.org/show_bug.cgi?id=104263

REPOSITORY
  R223 Okular

BRANCH
  cancellable (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D9328

AFFECTED FILES
  core/document.cpp
  core/document_p.h
  core/generator.cpp
  core/generator.h
  core/generator_p.cpp
  core/generator_p.h
  core/page_p.h
  core/textdocumentgenerator.cpp
  core/textdocumentgenerator.h
  generators/chm/generator_chm.cpp
  generators/chm/generator_chm.h
  generators/djvu/generator_djvu.cpp
  generators/djvu/generator_djvu.h
  generators/dvi/generator_dvi.cpp
  generators/dvi/generator_dvi.h
  generators/poppler/CMakeLists.txt
  generators/poppler/config-okular-poppler.h.cmake
  generators/poppler/generator_pdf.cpp
  generators/poppler/generator_pdf.h
  generators/xps/generator_xps.cpp
  generators/xps/generator_xps.h

To: aacid
Cc: #okular, michaelweghorn, gassaf, ngraham, aacid
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