# SPDX-FileCopyrightText: 2023 Brian Woods
# SPDX-License-Identifier: GPL-2.0-or-later

SRC_DIR=src
HIGH_OUT_DIR=high_quality
LOW_OUT_DIR=low_quality

HIGH_WEBP_OPT=-near_lossless 60
LOW_WEBP_OPT=-af -pass 6  -psnr 38

SRC_PNG=$(shell find ${SRC_DIR}/ -type f -iname '*.png')
SRC_WEBP=$(shell find ${SRC_DIR}/ -type f -iname '*.webp')
HIGH_OUT=$(patsubst ${SRC_DIR}/%.png, ${HIGH_OUT_DIR}/%.webp, $(SRC_PNG)) \
         $(patsubst ${SRC_DIR}/%.webp, ${HIGH_OUT_DIR}/%.webp, $(SRC_WEBP))
LOW_OUT=$(patsubst ${SRC_DIR}/%.png, ${LOW_OUT_DIR}/%.webp, $(SRC_PNG)) \
        $(patsubst ${SRC_DIR}/%.webp, ${LOW_OUT_DIR}/%.webp, $(SRC_WEBP))

.PHONY: all clean high low
.SECONDARY: main-build-high main-build-low

all: high low
high: pre-build-high main-build-high
low: pre-build-low main-build-low

pre-build-high:
	( cd ${SRC_DIR};  find ./ -mindepth 1 -type d ) | xargs -I{} mkdir -p "${HIGH_OUT_DIR}/{}"
pre-build-low:
	( cd ${SRC_DIR};  find ./ -mindepth 1 -type d ) | xargs -I{} mkdir -p "${LOW_OUT_DIR}/{}"

main-build-high: ${HIGH_OUT}
main-build-low: ${LOW_OUT}

${HIGH_OUT_DIR}/%.webp: ${SRC_DIR}/%.*
	cwebp ${HIGH_WEBP_OPT} "$<" -o "$@"
${LOW_OUT_DIR}/%.webp: ${SRC_DIR}/%.*
	cwebp ${LOW_WEBP_OPT} "$<" -o "$@"

clean:
	rm -rf ${HIGH_OUT_DIR} ${LOW_OUT_DIR}