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office-gobmx/vcl/README.vars.md
OmkarAcharekar 1ace888823 tdf#130857 Use native qt widgets - simple message dialog 
- Implements CreateMessageDialog method for QtInstance which would create message dialogs using native qt widgets.

  Example - MasterPasswordCreateDialog ( https://git.libreoffice.org/core/+/5e8c0575e877795aaca91346548cd0136fa22048/uui/source/masterpasscrtdlg.cxx#64 ).
  To trigger this :
  a) Go to "Tools" -> "Options".
  b) Select "LibreOfficeDev" -> "Security", then check "Persistently save passwords for web connections".
  c) In the master password dialog, enter two different passwords and click "OK". The message dialog appears now uses native qt widgets.

- adds Env variable SAL_VCL_QT_NO_WELDED_WIDGETS which reverts to previous behavior using VCL widgets.

Note: most of the methods from weld::Widget hierarchy are currently just dummy implementations for Qt case, only what's needed for simple message dialogs has been implemented in this patch.

Change-Id: I522489b8befb92f0092eb248ea2b81ecfbadd737
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/161073
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
Tested-by: Jenkins
2024-01-08 22:52:59 +01:00

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Environment variables in VCL

General

These are the general environment variables used in the VCL:

  • SAL_USE_VCLPLUGIN - use a VCL plugin

  • SAL_RTL_ENABLED - Enable RTL UI

  • SAL_NO_NWF - disable native widgets

  • SAL_FORCEDPI - force a specific DPI (gen, gtk3/gtk4, qt5/qt6/kf5/kf6 plugins only)

  • SAL_FORCE_HC - force high-contrast mode

  • SAL_USE_SYSTEM_LOOP - calls std::abort on nested event loop calls. Currently just for Qt with many crashes. WIP.

  • SAL_NO_FONT_LOOKUP - disable font search and fallback and always use a hard-coded font name (for some unit tests)

  • SAL_NON_APPLICATION_FONT_USE - control use of non-bundled fonts, values are deny or abort; for now only works on platforms using fontconfig (i.e., on Linux, but neither on macOS nor on Windows); also see gb_CppunitTest_set_non_application_font_use for using it in unit tests

  • SAL_ALLOW_DEFAULT_HINTING - use default font hinting for the platform. Enables medium/full hinting style which is otherwise reverted to (s)light.

  • LO_COLLECT_UIINFO - enable the uitesting logging, value is expected to be a relative file name that will be used to write the log under instdir/uitest/.

  • VCL_DOUBLEBUFFERING_AVOID_PAINT - don't paint the buffer, useful to see where we do direct painting

  • VCL_DOUBLEBUFFERING_FORCE_ENABLE - enable double buffered painting

  • VCL_DOUBLEBUFFERING_ENABLE - enable a safe subset of double buffered painting (currently in Writer, not in any other applications)

  • VCL_DEBUG_DISABLE_PDFCOMPRESSION - disable compression in the PDF writer

  • SAL_DISABLE_WATCHDOG - don't start the thread that watches for broken GL/Vulkan/OpenCL drivers

  • SAL_NO_MOUSEGRABS - for debugging - stop blocking UI if a breakpoint is hit

Gtk+

  • VCL_GTK3_PAINTDEBUG - in debug builds, if set to 1 then holding down shift+0 forces a redraw event, shift+1 repaints everything, and shift+2 dumps cairo frames to pngs as /tmp/frame<n>.png
  • GDK_SCALE=2 - for HiDPI scaling (just supports integers)

Bitmap

  • VCL_NO_THREAD_SCALE - disable threaded bitmap scale
  • VCL_NO_THREAD_IMPORT - disable threaded bitmap import
  • EMF_PLUS_DISABLE - use EMF rendering and ignore EMF+ specifics

OpenGL

  • SAL_DISABLEGL - disable OpenGL use
  • SAL_GL_NO_SWAP - disable buffer swapping if set (should show nothing)
  • SAL_GL_SLEEP_ON_SWAP - sleep for half a second on each swap-buffers.

Skia

  • SAL_DISABLESKIA=1 - force disabled Skia
  • SAL_ENABLESKIA=1 - enable Skia, unless denylisted (and if the VCL backend supports Skia)
  • SAL_FORCESKIA=1 - force using Skia, even if denylisted
  • SAL_SKIA=raster|vulkan|metal - select Skia's drawing method, by default Vulkan or Metal are used if available
  • SAL_DISABLE_SKIA_CACHE=1 - disable caching of complex images
  • SAL_SKIA_KEEP_BITMAP_BUFFER=1 - SkiaSalBitmap will keep its bitmap buffer even after storing in SkImage

OpenGL,Skia

  • SAL_WITHOUT_WIDGET_CACHE - disable LRU caching of native widget textures

Qt

  • QT_SCALE_FACTOR=2 - for HiDPI testing (also supports float)
  • SAL_VCL_QT_NO_FONTCONFIG - ignore fontconfig provided font substitutions
  • SAL_VCL_QT_NO_NATIVE - disable QStyle'd controls
  • SAL_VCL_QT_USE_QFONT - use QFont for text layout and rendering (default is to use cairo)
  • SAL_VCL_QT_NO_WELDED_WIDGETS - disable the use of welded Qt widgets, reverts to previous VCL widget behavior

Mac

  • SAL_FORCE_HIDPI_SCALING - set to 2 to fake HiDPI drawing (useful for unittests, windows may draw only top-left 1/4 of the content scaled)