[TASK] Convert images to webp if cwebp is available

screenshot.sh

@@ -4,7 +4,7 @@ DIR="/home/immortaly007/screenshot-log"
 FORMAT="png"
 SIMILARITY_DELETE_TRESHOLD=100
 HTML_THUMB_WIDTH=200
-SCALE="50%"
+SCALE="75%"
 # Max time (in seconds) to wait before forcing a screenshot even if spectacle is running
 SPECTACLE_BLOCKED_TIMEOUT=600  # 10 minutes
 
@@ -66,9 +66,20 @@ then
   echo "`date`: Distance = $DISTANCE; too similar; RM $SCR_NEW"
   # echo "`date` RM" >> $DIR/$DAY/log-.log
 else
-  mogrify -scale $SCALE $SCR_LAST
+  # If cwebp is available, convert the new screenshot to webp format and delete the original png
+  if command -v cwebp > /dev/null; then
+    WIDTH=$(identify -format "%w" $SCR_NEW)
+    TARGET_WIDTH=$(( WIDTH * ${SCALE%%%} / 100 ))
+    echo "Converting $SCR_NEW to webp format with target width $TARGET_WIDTH"
+    # I tried some different cwebp options (-preset text/picture), -m 6), but default seems to give the best results especially given runtime.
+    cwebp -quiet -resize $TARGET_WIDTH 0 $SCR_NEW -o "${SCR_NEW%.png}.webp"
+    rm $SCR_NEW
+    SCR_NEW="${SCR_NEW%.png}.webp"
+  else
+    # If cwebp is not available, we can still reduce the size of the png by resizing it with mogrify
+    mogrify -scale $SCALE $SCR_LAST
+  fi
   # Ensure that the new file is still seen as the most recent one
   FUTURE=`date +%Y%m%d%H%M.%S -d "+1 second"`
   touch -t $FUTURE  "$SCR_NEW"
-#   echo "<p>`date +%H:%M:%S` <a href=\"$SCR_NEW\"><img width=\"$HTML_THUMB_WIDTH\" src=\"$SCR_NEW\" /></a> <br />$WINDOW_TITLE </p>" >> $DIR/`date +%Y-%m-%d`-$PREFIX.html
 fi