Environment variables in VCL: General ------- 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 (gtk3 & qt5/kf5 plugins only) SAL_FORCE_HC - force high-contrast mode SAL_NO_FONT_LOOKUP - disable font search and fallback and always use a hard-coded font name (for some unit tests) 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 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.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_QT5_NO_FONTCONFIG - ignore fontconfig provided font substitutions SAL_VCL_QT5_NO_NATIVE - disable QStyle'd controls SAL_VCL_QT5_USE_CAIRO - use cairo for text rendering and fonts (default for kf5, but not qt5) Kf5 ----- SAL_VCL_KF5_USE_QFONT - use QFont for text rendering (default for qt5, but not kf5)