Support new background layer name

diff --git a/fgen.sh b/fgen.sh
index 64baf44..ea04217 100755 (executable)
--- a/fgen.sh
+++ b/fgen.sh
@@ -9,7 +9,7 @@ set -e
 PROG_NAME=$(basename $0)
 
 # Set default values
-main_layer="Layer 558"
+bg_layer_name="background"
 
 # Pour conversion vidéo:
 fps=8
@@ -162,16 +162,21 @@ if [ ${trames} -eq 1 ]; then
     ${SED} -i -e /label:,.*/d ${layers}
 
     # Extract global frame size:
-    size=$(get_size "${main_layer}")
+    size=$(get_size "${bg_layer_name}")
 
-    log_dbg "CANVAS SIZE=${size}"
+    log_dbg "Background size: ${size}"
+
+    if [ x"${size}" = x"" ]; then
+        echo "Error: background layer not found"
+        exit 1
+    fi
+
+    # Remove background line:
+    ${SED} -i -e /label:${bg_layer_name},.*/d ${layers}
 
     # Create background frame:
     convert -size ${size} xc:none ${dest}/background.png
 
-    # Remove first line (Layer 558):
-    ${SED} -i -e '1d' ${layers}
-
     # Will start at frame 2 at first loop iteration
     f=1