SOURCES = $(shell find images -name '*.svg')
TARGETS = $(patsubst %.svg,../data/%.png,$(SOURCES))
OPTIMIZE = 1

all: $(TARGETS)

clean:
	rm -f $(TARGETS)

../data/%.png: %.svg
	mkdir -p $(dir $@)
	inkscape --export-png $@ --export-dpi 9 $<
ifeq ($(OPTIMIZE),1)
	optipng -o4 -preserve $@
	advpng -z4 $@
endif