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-rw-r--r--x11vnc/help.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/x11vnc/help.c b/x11vnc/help.c
index f68b92b..cbd8870 100644
--- a/x11vnc/help.c
+++ b/x11vnc/help.c
@@ -174,10 +174,21 @@ void print_help(int mode) {
" to periodically refresh the screen (at the cost of\n"
" bandwidth).\n"
"\n"
+" Debugging for this mode can be enabled by setting the\n"
+" environment variable DEBUG_8TO24 to 1, 2, or 3.\n"
+"\n"
+" If there are problems, to enable an even more\n"
+" experimental mode, set the environment variable\n"
+" XGETIMAGE_8TO24=1 before starting x11vnc. This enables\n"
+" a scheme were XGetImage() is used to retrieve the 8bpp\n"
+" data instead of assuming that data is in bits 25-32.\n"
+" This mode is significantly slower than the above mode.\n"
+"\n"
" Note that -8to24 does not work on displays with 8bpp\n"
" default visual with depth 24 applications. The Xserver\n"
-" -cc option can be used to switch the default depth on\n"
-" multidepth setups.\n"
+" -cc option can be used to switch the default depth\n"
+" on multidepth setups. It may be possible to handle\n"
+" this case.\n"
"\n"
"-scale fraction Scale the framebuffer by factor \"fraction\". Values\n"
" less than 1 shrink the fb, larger ones expand it. Note:\n"