woof-CE-libre/woof-code/rootfs-skeleton/usr/sbin/xgamma-gui

#!/bin/bash
#Written by PANZERKOPF
#100215 hacked by BK
#101207 hacked by EW
#121019 BK: fixed. internationalized.
#121022 L18L: complete the internationalization.

#101207 EW:
# this is a Xdialog frontend for the xgamma program - setting colour calibration for the screen
# It is using the 3 RGB channels 
# xgamma uses a logharithmic scale for the gamma values (0.1 - darkest, 1.0 - default, 10.0 - brightest) -> Y Values
# The GUI uses a linear scale (going from -100 - darkest, 0.0 - default, +100 - brightest) -> X Values
# The transformation is given by Y=10^(X/100)
# the calculation has to be performed with bc, 
# to use decimal values in the exponent the equation must be rewritten Y = exp ( X/100 * log (10))
# or, setting the precision to 3 decimal points using bc command: Y=$(echo "e( "$X"/100 * l(10))" | bc -l)
# The reverse transformation is XRED=$(echo "scale:0; 100 * l($YRED) / l(10)" | bc -l)

export TEXTDOMAIN=xgamma-gui
export OUTPUT_CHARSET=UTF-8

TITLE="$(gettext 'Monitor Gamma calibration')"
BACKTITLE="$(gettext 'Set value for each colour, or adjust equally if only want to adjust brightness of screen.')
$(gettext 'The spinboxes are adjustable in the range -100 to +100, where -100 is darkest, 0 is default, and +100 is brightest.')"

if [ "`which xgamma`" = "" ]; then
 Xdialog --title "${TITLE}" --msgbox "$(gettext 'xgamma not found.')" 0 0
 exit
fi

#get current settings (for startup)
YGAMMA="$(xgamma 2>&1 | tr -s ' ' | sed -e 's%[^0-9. ]%%g' | tr -s ' ')" #ex:  10.000  1.000  1.000

YRED="$(echo "$YGAMMA" | cut -f 2 -d ' ')"
YGREEN="$(echo "$YGAMMA" | cut -f 3 -d ' ')"
YBLUE="$(echo "$YGAMMA" | cut -f 4 -d ' ')"
inYRED="$YRED"
inYGREEN="$YGREEN"
inYBLUE="$YBLUE"

echo $YGAMMA 
echo $YRED $YGREEN $YBLUE

#transform y-->x values, 3 decimals precision, to get the current values;
XRED=$(echo "scale=3; 100 * l("$YRED") / l(10)" | bc -l)
XRED=$(echo "scale=0; "$XRED"/1" | bc -l) # cut decimals
XGREEN=$(echo "scale=3; 100 * l("$YGREEN") / l(10)" | bc -l)
XGREEN=$(echo "scale=0; "$XGREEN"/1" | bc -l) # cut decimals
XBLUE=$(echo "scale=3; 100 * l("$YBLUE") / l(10)" | bc -l)
XBLUE=$(echo "scale=0; "$XBLUE"/1" | bc -l) # cut decimals

EXCODE="0"
REDLABEL="$(gettext 'Red')"
GREENLABEL="$(gettext 'Green')"
BLUELABEL="$(gettext 'Blue')"

APPLIEDFLAG='no'
while [ "${EXCODE}" = "0" ]; do

 XDGOUT=`Xdialog  --wrap --left --backtitle "${BACKTITLE}" --title "${TITLE}" --stdout --buttons-style "text" --icon "/usr/share/images/xgamma-gui.xpm" --ok-label "$(gettext 'Apply')" --cancel-label "$(gettext 'Exit')" \
--3spinsbox "" 356x0 "-100" "100" "$XRED" "${REDLABEL}" "-100" "100" "$XGREEN" "${GREENLABEL}" "-100" "100" "$XBLUE" "${BLUELABEL}"`
 
 # get exit code
 EXCODE=${?}
 
 XGAMMA=$XDGOUT
 # substitute >space< for >/<, otherways there are problems to parse the string properly
 XGAMMA=$(echo $XGAMMA| sed 's:/: :g')

 [ "${EXCODE}" != "0" ] && break

 APPLIEDFLAG='yes'
  
 # cut in pieces (parse) and assign
 set -- ${XGAMMA// / }
 XRED=$1
 XGREEN=$2
 XBLUE=$3
 
 # make transformation x-->y 
 YRED=$(echo "scale=3; e( "$XRED"/100 * l(10))" | bc -l)
 YGREEN=$(echo "scale=3; e( "$XGREEN"/100 * l(10))" | bc -l)
 YBLUE=$(echo "scale=3; e( "$XBLUE"/100 * l(10))" | bc -l)
 
 #apply gamma values 
 xgamma -rgamma ${YRED} -ggamma ${YGREEN} -bgamma ${YBLUE}
 
done

# if default values we dont need xgamma at startup, so remove the file. This saves time in .xinitrc
if [ "$XGAMMA" = "0 0 0" ]; then
	rm -f $HOME/.xgamma-gamma
	exit
fi
if [ "$inYRED" = "$YRED" ];then
 if [ "$inYGREEN" = "$YGREEN" ];then
  if [ "$inYBLUE" = "$YBLUE" ];then
   exit
  fi
 fi
fi
[ "$APPLIEDFLAG" = "no" ] && exit

# else ask if we want to save the current values and create a startup calibration file
Xdialog --yesno "$(gettext 'Save current configuration?')" 0 0
if [ ${?} -eq 0 ]; then
  echo -n "xgamma -rgamma $YRED -ggamma $YGREEN -bgamma $YBLUE"' &' > $HOME/.xgamma-gamma
  #...xgamma is executed in /root/.xinitrc
  echo "Saved"  
fi

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