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#!/bin/bash
# Push a blurred copy of a wallpaper to the awww-daemon backdrop namespace.
# Prefers a pre-made <name>-blur.<ext> sibling; otherwise generates one into the cache.
# Used by theme-switcher.sh and apply-colors.sh for the niri Overview backdrop.
set -euo pipefail
IMG="${1:-}"
if [ -z "$IMG" ] || [ ! -f "$IMG" ]; then
echo "usage: $0 <image>" >&2
exit 1
fi
EXT="${IMG##*.}"
SIBLING="${IMG%.*}-blur.${EXT}"
if [ -f "$SIBLING" ]; then
BLURRED="$SIBLING"
else
CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/niri-backdrop"
mkdir -p "$CACHE_DIR"
BASE=$(basename "${IMG%.*}")
BLURRED="$CACHE_DIR/${BASE}-blur.jpg"
if [ ! -f "$BLURRED" ] || [ "$IMG" -nt "$BLURRED" ]; then
magick "$IMG" -blur 0x16 -quality 90 "$BLURRED"
fi
fi
awww img "$BLURRED" -n backdrop
echo "$BLURRED" >/tmp/current_backdrop_state
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