如何将一个字符串变为图片

#define MAX_HZ_FILE_LEN 300000



char g_hz_inited=0;

char g_hz_buffer[MAX_HZ_FILE_LEN];

char *g_hz_file_name = "./Hzk16.dat";  //中文字库

int g_hz_file_size=0;



int init_hz()

{

    int fd;

    int file_size=0;



    fd = open(g_hz_file_name, O_RDWR, 0666);

    if(fd<0)

    {

        return -1;

    }

    lseek(fd, 0, SEEK_SET);

    g_hz_file_size = lseek(fd, 0, SEEK_END);

    lseek(fd, 0, SEEK_SET);



    file_size = 0;

    int tmp_size=0;

    while (file_size < g_hz_file_size)

    {

        tmp_size = read(fd, g_hz_buffer + file_size, g_hz_file_size - file_size);

        file_size = file_size + tmp_size;

    }

    g_hz_inited = 1;

    close(fd);

    return 0;

}



int convert_hz_to_bmp(uint8_t *str, char * buffer)

{

    int i,j,k;

    int qcode,wcode;

    char mat[16][2];

    char * hz_ptr;



    qcode=(*str)-0xa0;

    wcode=*(str+1)-0xa0;

    if (!g_hz_inited)

    {

        if (init_hz()<0)

            return -1;

    }



    hz_ptr = g_hz_buffer + (94*(qcode-1)+(wcode-1))*32;



    for(i=0;i<16;i++)

    {

        for(j=0;j<2;j++)

        {

        mat[i][j]=*(hz_ptr++);

        }

    }



    for(j=0;j<16;j++)

    for(i=0;i<2;i++)

    for(k=0;k<8;k++)

    {

    if(mat[j][i]&(0x80>>k))

        {

            buffer[3*(j*16 + i*8 + k)] = 255;

        }else

        {

            buffer[3*(j*16 + i*8 + k)] = 0;

        }

        buffer[3*(j*16 + i*8 + k) + 1] = 0;

        buffer[3*(j*16 + i*8 + k) + 2] = 0;

    }



    return 0;

}