New file containing functions that use xrandr to set maximum resolution,

configure screen layout, etc.

1 files changed, 137 insertions, 0 deletions

diff --git a/mdm/src/xrandr-functions b/mdm/src/xrandr-functions
new file mode 100755
index 0000000..32c49ea
--- /dev/null
+++ b/mdm/src/xrandr-functions
@@ -0,0 +1,137 @@
+#! /bin/bash
+# The following functions are specific for configuring X resolutions
+# This is important for multihead on cards with more than one output
+
+MDM_ETC=/etc/mdm
+SCREEN_POSITIONS=
+SCREEN_SIZES=
+SCREEN_AMOUNT=
+OUTPUT_NAMES=
+XRANDR_INFO=${MDM_ETC}/xrandr.info
+
+# The following functions are used to configure the maximum
+# resolution available to current screen.
+
+function xrandr_configure_layout () {
+    # We do need a value for $SCREEN_SIZES
+    if [ -z "$SCREEN_SIZES" ]; then
+        xrandr_screen_amount
+    fi
+
+    # Test if $OUTPUT_NAMES is not null (it happens with older drivers 
+	# and/or older versions of xrandr).
+    # In case, screen resolution might be already configured
+    OUTPUT_NAMES=(`xrandr|grep "\<connected"|cut -d' ' -f1`)
+    if [ -n "$OUTPUT_NAMES" ]; then
+    
+        if [ "${#OUTPUT_NAMES[@]}" == "1" ]; then
+            xrandr --output ${OUTPUT_NAMES[0]} --mode ${SCREEN_SIZES[0]}
+        else
+            # Configuring the first head:
+            xrandr --output ${OUTPUT_NAMES[0]} --mode ${SCREEN_SIZES[0]}
+            
+            # To configure the other heads, it is necessary to have
+            # the first head already configured.
+            for (( a = 1; a < ${#OUTPUT_NAMES[@]}; a++ )); do
+                j=$(($a-1))
+                xrandr --output ${OUTPUT_NAMES[$a]} \
+                       --right-of ${OUTPUT_NAMES[$j]}
+            done
+        fi
+    fi
+}
+
+function xrandr_set_resolutions () {
+    
+    if [ -z "$SCREEN_SIZES" ];then
+        xrandr_screen_amount
+    fi
+    # We may have none outputs, it happens when there are no
+    # monitors connected to the outputs.
+    # Old drivers give us information even with the monitors shut down
+    if [ ! -z "$OUTPUT_NAMES" ]; then
+        # Trying one head:
+        if [ "${#OUTPUT_NAMES[@]}" = "1" ]; then
+            xrandr --output ${OUTPUT_NAMES[@]} --mode ${SCREEN_SIZES} 2>/dev/null
+        # The following sequence will only be activated with 
+        # more than one head:
+        else
+            # Configuring the first head:
+            xrandr --output ${OUTPUT_NAMES[0]} --mode ${SCREEN_SIZES[0]}
+ 
+            # To configure the other heads, it is necessary to have
+            # the first head already configured.
+            for (( b=1; b < ${#OUTPUT_NAMES[@]}; b++ )); do
+                xrandr --output ${OUTPUT_NAMES[$b]} \
+                       --mode ${SCREEN_SIZES[$b]} 2>/dev/null
+            done
+        fi
+    fi
+}
+
+function xrandr_set_screen_amount () {
+    
+    SCREEN_SIZES=(`xrandr|grep -A1 "\<connected"  |
+                   tr -s ' '| egrep "^ [0-9]*x[0-9]*"           |
+                   cut -d' ' -f2`)
+
+    # According to driver in use, different
+    # outputs may occur, that is the reason for us to
+    # check if there is a value on $SCREEN_SIZES
+    if [ -z "$SCREEN_SIZES" ]; then
+        SCREEN_SIZES=`xrandr|grep "maximum"       |
+                      awk '{print $(NF-2)"x"$NF}'`
+    fi
+    
+    # In case the xrandr version is older than 1.2:
+    if [ -z "$SCREEN_SIZES" ]; then
+        SCREEN_SIZES=`xrandr|egrep -m1 "( |\*)[0-9] "|
+                      awk '{print $2"x"$4}'`
+    fi
+
+    OUTPUT_NAMES=(`xrandr|grep "\<connected"|cut -d' ' -f1`)
+    SCREEN_AMOUNT=${#OUTPUT_NAMES[@]}
+    OUTPUT_NAMES=${OUTPUT_NAMES:=none}
+
+    if (( ${#SCREEN_SIZES[@]} < ${#OUTPUT_NAMES[@]} ));then
+        for (( l = 0 ; l < ${#OUTPUT_NAMES[@]} ; l++ )); do
+            if [ -z "${SREEN_SIZES[l]}" ]; then
+                SCREEN_SIZES[l]=$SCREEN_SIZES
+            fi
+        done
+    fi
+}
+
+function xrandr_set_screen_position () {
+
+    xrandr_screen_amount
+
+    if (( "$SCREEN_AMOUNT" > 1 )); then
+        SCREEN_POSITIONS[0]=0
+        for (( k=0; k<$((SCREEN_AMOUNT-1)); k++)); do
+            SCREEN_POSITIONS[((k+1))]=$((`echo ${SCREEN_SIZES[k]}|
+                                       cut -d'x' -f1`+${SCREEN_POSITIONS[k]}))
+        done
+    else
+        SCREEN_POSITIONS=0
+    fi
+}
+
+function xrandr_create_info_file () {
+
+    xrandr_screen_position
+    
+    # Generating a header
+    if [ ! -f "$XRANDR_INFO" ]; then
+        echo "Xrandr info file generated on: `date`" >> $XRANDR_INFO
+    fi
+        echo >> $XRANDR_INFO
+        echo "DISPLAY=`echo $DISPLAY`" >> $XRANDR_INFO
+        echo "SCREEN_AMOUNT=$SCREEN_AMOUNT" >> $XRANDR_INFO
+        echo "OUTPUT_NAMES=${OUTPUT_NAMES[@]}" >> $XRANDR_INFO
+        echo "SCREEN_SIZES=${SCREEN_SIZES[@]}" >> $XRANDR_INFO
+        echo "SCREEN_POSITIONS=${SCREEN_POSITIONS[@]}" >> $XRANDR_INFO
+        echo "------------ end ------------" >> $XRANDR_INFO
+        # Unsetting all vector positions
+        unset SCREEN_POSITIONS
+}