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Environment variables in VCL:
General
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SAL_USE_VCLPLUGIN - use a VCL plugin
SAL_NO_NWF - disable native widgets
SAL_FORCEDPI - force a specific DPI (gtk & gtk3 plugins only)
SAL_FORCE_HC - force high-contrast mode
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_HIDE_WINDOWS - don't draw windows
Bitmap
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VCL_NO_THREAD_SCALE - disable threaded bitmap scale
EMF_PLUS_DISABLE - use EMF rendering and ignore EMF+ specifics
OpenGL
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SAL_FORCEGL - force enable OpenGL
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.
SAL_WITHOUT_WIDGET_CACHE - disable LRU caching of native widget texutres
SAL_DISABLE_GLYPH_CACHING - don't render glyphs through OpenGL textures
SAL_DISABLE_GL_WATCHDOG - don't start the thread that watches for broken GL drivers
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