C函数将原始图像转换为png

from PIL import Image

# 读取JPEG格式的图像文件
jpeg_image = Image.open("input.jpg")

# 将图像转换为PNG格式
png_image = jpeg_image.convert("RGBA")

# 保存PNG格式的图像文件
png_image.save("output.png", "PNG")

#include<stdio.h>
#include <stdlib.h>
#include<string.h>
#include <png.h>

#define PNG_BYTES_TO_CHECK 4

void read_bmp_file(char *filename, unsigned char **data, unsigned int *width, unsigned int *height) {
    // 读取BMP格式的图像文件
    // ...
}

void write_png_file(char *filename, unsigned char *data, unsigned int width, unsigned int height) {
    // 将图像转换为PNG格式并保存到文件中
    // ...
}

int main(int argc, char *argv[]) {
    unsigned char *data;
    unsigned int width, height;

    if (argc != 3) {
        printf("Usage: %s input_file output_file\n", argv[0]);
        return 1;
    }

    read_bmp_file(argv[1], &data, &width, &height);
    write_png_file(argv[2], data, width, height);

    free(data);

    return 0;
}