CC = emcc
CFLAGS = -I libwebp -O3 --bind -msimd128 -s EXPORTED_RUNTIME_METHODS=HEAP8,HEAPU8 -s WASM=1 -s ALLOW_MEMORY_GROWTH=1 -s ENVIRONMENT=web,worker -s EXPORT_ES6=0 -s DYNAMIC_EXECUTION=0 -s MODULARIZE=0

TARGET_JS = webp160.js
TARGET_WASM = webp160.wasm

SRCS = $(wildcard libwebp/src/dec/*.c)
SRCS += $(wildcard libwebp/src/dsp/*.c)
SRCS += $(wildcard libwebp/src/demux/*.c)
SRCS += $(wildcard libwebp/src/enc/*.c)
SRCS += $(wildcard libwebp/src/mux/*.c)
SRCS += $(wildcard libwebp/src/utils/*.c)
SRCS += $(wildcard libwebp/sharpyuv/*.c)
SRCS += $(wildcard src/*.c)

all: $(TARGET_JS)

$(TARGET_JS): $(SRCS)
	$(CC) $(SRCS) $(CFLAGS) -o $(TARGET_JS)

clean:
	@if exist $(TARGET_JS) del $(TARGET_JS)
	@if exist $(TARGET_WASM) del $(TARGET_WASM)

#include "emscripten.h"
#include "src/webp/encode.h"
#include <stdlib.h>

EMSCRIPTEN_KEEPALIVE
int version()
{
    return WebPGetEncoderVersion();
}

EMSCRIPTEN_KEEPALIVE
void *create_buffer(int width, int height)
{
    return malloc(width * height * 4 * sizeof(uint8_t));
}

EMSCRIPTEN_KEEPALIVE
void destroy_buffer(uint8_t *p)
{
    free(p);
}

int result[2];
EMSCRIPTEN_KEEPALIVE
void encode(uint8_t *img_in, int width, int height, float quality)
{
    uint8_t *img_out;
    size_t size;

    size = WebPEncodeRGBA(img_in, width, height, width * 4, quality, &img_out);

    result[0] = (int)img_out;
    result[1] = size;
}

EMSCRIPTEN_KEEPALIVE
void free_result(uint8_t *result)
{
    WebPFree(result);
}

EMSCRIPTEN_KEEPALIVE
int get_result_pointer()
{
    return result[0];
}

EMSCRIPTEN_KEEPALIVE
int get_result_size()
{
    return result[1];
}