generate jxl from png,jpg,gif

Makefile

@@ -66,6 +66,11 @@ $(TMPDIR)/%_big.jpg: $(DATADIR)/%.jpg
 	$(call resize,$(BIG),$(BIG),>)
 
 
+%.jxl: %.png ; $(call cjxl,-e 9)
+%.jxl: %.jpg ; $(call cjxl,-e 9)
+%.jxl: %.gif ; $(call cjxl)
+
+
 $(MAKEPAGES): make-pages/*.hs make-pages/make-pages.cabal
 	echo "[make-pages]"
 	mkdir -p $(dir $@)
@@ -133,6 +138,14 @@ mkdir -p "$(dir $@)"
 convert -resize "$(1)x$(2)$(3)" $(4) "$^" "$@"
 endef
 
+# args:
+#  1. extra flags
+define cjxl
+echo "[cjxl]    "$@
+mkdir -p "$(dir $@)"
+cjxl -d 1 "$^" "$@" $(1) 2>/dev/null
+endef
+
 # no args
 define depend-gallery
 echo "[deps]    "$@