RGB源数据操作: 在RGB源数据上添加字符串水印

一、运行环境介绍

Linux系统: Redhat6.3 (32位)

gcc 版本 4.4.6 20120305 (Red Hat 4.4.6-4) (GCC)

二、功能介绍

创建一张BMP图片，将图片当做画板，在图片的指定位置绘制常用ASCII字符串。

三、核心代码

可以传入任意尺寸的图片进行生成绘制。

#include 
#include 
#include 

#pragma pack(1) //强制1个字节对齐
//BMP的文件头
struct _BMP_HEAD
{
    char type[2]; //图片的类型 "BM"
    unsigned int size; //文件大小
    unsigned short  r1; //保留1
    unsigned short  r2; //保留2
    unsigned int seek; //数据偏移字节(真实像素点数据)
};

//BMP的参数信息
struct _BMP_INFO
{
    unsigned int size; //当前结构体大小
    unsigned int w; //宽度
    unsigned int h; //高度
    unsigned short flag; //固定为1
    unsigned short bit; //像素点的位数
    unsigned int r1; //压缩方式  0
    unsigned int r2; //水平分辨率
    unsigned int r3; //垂直分辨率
    unsigned int r4; //垂直分辨率
    unsigned int r5; //引用色彩
    unsigned int r6; //关键色彩
};

//外部引用声明
extern unsigned char DATA_8_16[95][16];

/*
函数功能: 显示像素点
*/
void Display_Point(char *head,int w,int x,int y,int c)
{
    unsigned char *p=(unsigned char *)(head+w*3*y+x*3);
    *(p+0)=(c>>0)&0xFF;
    *(p+1)=(c>>8)&0xFF;
    *(p+2)=(c>>16)&0xFF;
}

/*
函数功能: 显示一个数据
函数参数:
char *font 取模数据的首地址  (横向取模--高位在前)
int w  取模字体的宽度
int h  取模字体的高度
*/
void Display_Data(char *font,int w,int h,char *image_head,int image_w,int x,int y)
{
    int i,j;
    int x0=x;
    unsigned char data;
    for(i=0;i=' ' && *str<='~')
        {
            //绘制一个字符
            Display_Data(DATA_8_16[*str-' '],w,h,image_head,image_w,x,y);
        }   
        x+=w; //绘制下一个字符
        if(x>image_w)  //横坐标大于图片的宽度就换行
        {
            y+=h;
            x=0;
        }
        str++;
    }
}



int main(int argc,char **argv)
{
    if(argc!=4)
    {
        printf("传入的参数格式: ./a.out <新图片宽度> <新图片高度> <新图片的名称>\n");
        printf("例如: ./a.out 80 80 test.bmp");
        printf("传入的宽度和高度需要>=48\n");
        return 0;
    }
    
    /*1. 创建一张BMP图片*/
    FILE *fp=fopen(argv[3],"wb");
    if(fp==NULL)
    {
        printf("%s 文件创建失败.\n",argv[1]);
        return 0;
    }
    /*2. 创建BMP的文件头*/
    int cnt;
    struct _BMP_HEAD bmp_head;
    memset(&bmp_head,0,sizeof(struct _BMP_HEAD));
    //图片的类型
    bmp_head.type[0]='B';
    bmp_head.type[1]='M';
    //文件大小
    bmp_head.size=54+atoi(argv[1])*atoi(argv[2])*3;
    //数据偏移量
    bmp_head.seek=54;
    //写文件头
    cnt=fwrite(&bmp_head,1,sizeof(struct _BMP_HEAD),fp);
    printf("成功写入:%d 字节.\n",cnt);

    /*3. 写文件参数信息*/
    struct _BMP_INFO bmp_info;
    memset(&bmp_info,0,sizeof(struct _BMP_INFO));
    //当前结构体大小
    bmp_info.size=sizeof(struct _BMP_INFO);
    //图片的宽度和高度
    bmp_info.w=atoi(argv[1]);
    bmp_info.h=atoi(argv[2]);
    //图片的颜色位数
    bmp_info.bit=24;
    //标志位
    bmp_info.flag=1;
    //写入文件参数信息
    cnt=fwrite(&bmp_info,1,sizeof(struct _BMP_INFO),fp);
    printf("成功写入:%d 字节.\n",cnt);

    /*4.添加水印: 制作图片的数据*/
    int one_line_byte=bmp_info.w*3; //BMP图片一行的字节数
    while(one_line_byte%4!=0) //补齐4的倍数
    {
        one_line_byte++;
    }
    one_line_byte=one_line_byte-bmp_info.w*3; //得到需要补齐的字节数量

    //申请一个存放图片颜色数据的缓冲区
    char *head_p=malloc(bmp_info.w*3*bmp_info.h);
    //将缓冲区初始化
    memset(head_p,0xFF,bmp_info.w*3*bmp_info.h);

    //绘制水印
    Display_String("2020/08/12 9:36",8,16,head_p,bmp_info.w,0,16);
    
    /*5. 写入位图数据*/
    int w,h;
    char *tmp_p;
    for(h=bmp_info.h-1;h>=0;h--)
    {
        tmp_p=head_p+h*bmp_info.w*3;     //从缓冲区的最后一行开始读取
        fwrite(tmp_p,1,bmp_info.w*3,fp); //写一行数据
        if(one_line_byte) //判断是否需要补齐
        fwrite(tmp_p,1,one_line_byte,fp); //写补齐的数据(占位而已--没有显示作用)
    }
    /*6. 关闭文件*/
    fclose(fp);
    free(head_p);
    return 0;
}

//8*16
unsigned char DATA_8_16[95][16]=
{
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*" ",0*/

{0x00,0x00,0x00,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x00,0x00,0x10,0x10,0x00,0x00},/*"!",1*/

{0x00,0x12,0x24,0x24,0x48,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*""",2*/

{0x00,0x00,0x00,0x12,0x12,0x12,0x7E,0x24,0x24,0x24,0x7E,0x24,0x24,0x24,0x00,0x00},/*"#",3*/

{0x00,0x00,0x08,0x3C,0x4A,0x4A,0x48,0x38,0x0C,0x0A,0x0A,0x4A,0x4A,0x3C,0x08,0x08},/*"$",4*/

{0x00,0x00,0x00,0x44,0xA4,0xA8,0xA8,0xB0,0x54,0x1A,0x2A,0x2A,0x4A,0x44,0x00,0x00},/*"%",5*/

{0x00,0x00,0x00,0x30,0x48,0x48,0x48,0x50,0x6E,0xA4,0x94,0x98,0x89,0x76,0x00,0x00},/*"&",6*/

{0x00,0x60,0x20,0x20,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"'",7*/

{0x00,0x02,0x04,0x08,0x08,0x10,0x10,0x10,0x10,0x10,0x10,0x08,0x08,0x04,0x02,0x00},/*"(",8*/

{0x00,0x40,0x20,0x10,0x10,0x08,0x08,0x08,0x08,0x08,0x08,0x10,0x10,0x20,0x40,0x00},/*")",9*/

{0x00,0x00,0x00,0x00,0x10,0x10,0xD6,0x38,0x38,0xD6,0x10,0x10,0x00,0x00,0x00,0x00},/*"*",10*/

{0x00,0x00,0x00,0x00,0x00,0x08,0x08,0x08,0x7F,0x08,0x08,0x08,0x00,0x00,0x00,0x00},/*"+",11*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x60,0x20,0x20,0x40},/*",",12*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x7E,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"-",13*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x60,0x60,0x00,0x00},/*".",14*/

{0x00,0x00,0x02,0x04,0x04,0x04,0x08,0x08,0x10,0x10,0x10,0x20,0x20,0x40,0x40,0x00},/*"/",15*/

{0x00,0x00,0x00,0x18,0x24,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x24,0x18,0x00,0x00},/*"0",16*/

{0x00,0x00,0x00,0x08,0x38,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x3E,0x00,0x00},/*"1",17*/

{0x00,0x00,0x00,0x3C,0x42,0x42,0x42,0x02,0x04,0x08,0x10,0x20,0x42,0x7E,0x00,0x00},/*"2",18*/

{0x00,0x00,0x00,0x3C,0x42,0x42,0x02,0x04,0x18,0x04,0x02,0x42,0x42,0x3C,0x00,0x00},/*"3",19*/

{0x00,0x00,0x00,0x04,0x0C,0x0C,0x14,0x24,0x24,0x44,0x7F,0x04,0x04,0x1F,0x00,0x00},/*"4",20*/

{0x00,0x00,0x00,0x7E,0x40,0x40,0x40,0x78,0x44,0x02,0x02,0x42,0x44,0x38,0x00,0x00},/*"5",21*/

{0x00,0x00,0x00,0x18,0x24,0x40,0x40,0x5C,0x62,0x42,0x42,0x42,0x22,0x1C,0x00,0x00},/*"6",22*/

{0x00,0x00,0x00,0x7E,0x42,0x04,0x04,0x08,0x08,0x10,0x10,0x10,0x10,0x10,0x00,0x00},/*"7",23*/

{0x00,0x00,0x00,0x3C,0x42,0x42,0x42,0x24,0x18,0x24,0x42,0x42,0x42,0x3C,0x00,0x00},/*"8",24*/

{0x00,0x00,0x00,0x38,0x44,0x42,0x42,0x42,0x46,0x3A,0x02,0x02,0x24,0x18,0x00,0x00},/*"9",25*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x00,0x00,0x00,0x00,0x18,0x18,0x00,0x00},/*":",26*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x00,0x00,0x00,0x00,0x10,0x10,0x10},/*";",27*/

{0x00,0x00,0x00,0x02,0x04,0x08,0x10,0x20,0x40,0x20,0x10,0x08,0x04,0x02,0x00,0x00},/*"<",28*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x7E,0x00,0x00,0x7E,0x00,0x00,0x00,0x00,0x00,0x00},/*"=",29*/

{0x00,0x00,0x00,0x40,0x20,0x10,0x08,0x04,0x02,0x04,0x08,0x10,0x20,0x40,0x00,0x00},/*">",30*/

{0x00,0x00,0x00,0x3C,0x42,0x42,0x62,0x04,0x08,0x08,0x08,0x00,0x18,0x18,0x00,0x00},/*"?",31*/

{0x00,0x00,0x00,0x38,0x44,0x5A,0xAA,0xAA,0xAA,0xAA,0xAA,0x5C,0x42,0x3C,0x00,0x00},/*"@",32*/

{0x00,0x00,0x00,0x10,0x10,0x18,0x28,0x28,0x24,0x3C,0x44,0x42,0x42,0xE7,0x00,0x00},/*"A",33*/

{0x00,0x00,0x00,0xF8,0x44,0x44,0x44,0x78,0x44,0x42,0x42,0x42,0x44,0xF8,0x00,0x00},/*"B",34*/

{0x00,0x00,0x00,0x3E,0x42,0x42,0x80,0x80,0x80,0x80,0x80,0x42,0x44,0x38,0x00,0x00},/*"C",35*/

{0x00,0x00,0x00,0xF8,0x44,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x44,0xF8,0x00,0x00},/*"D",36*/

{0x00,0x00,0x00,0xFC,0x42,0x48,0x48,0x78,0x48,0x48,0x40,0x42,0x42,0xFC,0x00,0x00},/*"E",37*/

{0x00,0x00,0x00,0xFC,0x42,0x48,0x48,0x78,0x48,0x48,0x40,0x40,0x40,0xE0,0x00,0x00},/*"F",38*/

{0x00,0x00,0x00,0x3C,0x44,0x44,0x80,0x80,0x80,0x8E,0x84,0x44,0x44,0x38,0x00,0x00},/*"G",39*/

{0x00,0x00,0x00,0xE7,0x42,0x42,0x42,0x42,0x7E,0x42,0x42,0x42,0x42,0xE7,0x00,0x00},/*"H",40*/

{0x00,0x00,0x00,0x7C,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x7C,0x00,0x00},/*"I",41*/

{0x00,0x00,0x00,0x3E,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x88,0xF0},/*"J",42*/

{0x00,0x00,0x00,0xEE,0x44,0x48,0x50,0x70,0x50,0x48,0x48,0x44,0x44,0xEE,0x00,0x00},/*"K",43*/

{0x00,0x00,0x00,0xE0,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x42,0xFE,0x00,0x00},/*"L",44*/

{0x00,0x00,0x00,0xEE,0x6C,0x6C,0x6C,0x6C,0x6C,0x54,0x54,0x54,0x54,0xD6,0x00,0x00},/*"M",45*/

{0x00,0x00,0x00,0xC7,0x62,0x62,0x52,0x52,0x4A,0x4A,0x4A,0x46,0x46,0xE2,0x00,0x00},/*"N",46*/

{0x00,0x00,0x00,0x38,0x44,0x82,0x82,0x82,0x82,0x82,0x82,0x82,0x44,0x38,0x00,0x00},/*"O",47*/

{0x00,0x00,0x00,0xFC,0x42,0x42,0x42,0x42,0x7C,0x40,0x40,0x40,0x40,0xE0,0x00,0x00},/*"P",48*/

{0x00,0x00,0x00,0x38,0x44,0x82,0x82,0x82,0x82,0x82,0x82,0xB2,0x4C,0x38,0x06,0x00},/*"Q",49*/

{0x00,0x00,0x00,0xFC,0x42,0x42,0x42,0x7C,0x48,0x48,0x44,0x44,0x42,0xE3,0x00,0x00},/*"R",50*/

{0x00,0x00,0x00,0x3E,0x42,0x42,0x40,0x20,0x18,0x04,0x02,0x42,0x42,0x7C,0x00,0x00},/*"S",51*/

{0x00,0x00,0x00,0xFE,0x92,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x38,0x00,0x00},/*"T",52*/

{0x00,0x00,0x00,0xE7,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x3C,0x00,0x00},/*"U",53*/

{0x00,0x00,0x00,0xE7,0x42,0x42,0x44,0x24,0x24,0x28,0x28,0x18,0x10,0x10,0x00,0x00},/*"V",54*/

{0x00,0x00,0x00,0xD6,0x54,0x54,0x54,0x54,0x54,0x6C,0x28,0x28,0x28,0x28,0x00,0x00},/*"W",55*/

{0x00,0x00,0x00,0xE7,0x42,0x24,0x24,0x18,0x18,0x18,0x24,0x24,0x42,0xE7,0x00,0x00},/*"X",56*/

{0x00,0x00,0x00,0xEE,0x44,0x44,0x28,0x28,0x10,0x10,0x10,0x10,0x10,0x38,0x00,0x00},/*"Y",57*/

{0x00,0x00,0x00,0x7E,0x84,0x04,0x08,0x08,0x10,0x20,0x20,0x42,0x42,0xFC,0x00,0x00},/*"Z",58*/

{0x00,0x1E,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x1E,0x00},/*"[",59*/

{0x00,0x00,0x40,0x20,0x20,0x20,0x10,0x10,0x10,0x08,0x08,0x04,0x04,0x04,0x02,0x02},/*"\",60*/

{0x00,0x78,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x78,0x00},/*"]",61*/

{0x00,0x18,0x24,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"^",62*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF},/*"_",63*/

{0x00,0x60,0x10,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"`",64*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x38,0x44,0x0C,0x34,0x44,0x4C,0x36,0x00,0x00},/*"a",65*/

{0x00,0x00,0x00,0x00,0xC0,0x40,0x40,0x58,0x64,0x42,0x42,0x42,0x64,0x58,0x00,0x00},/*"b",66*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1C,0x22,0x40,0x40,0x40,0x22,0x1C,0x00,0x00},/*"c",67*/

{0x00,0x00,0x00,0x00,0x06,0x02,0x02,0x3E,0x42,0x42,0x42,0x42,0x46,0x3B,0x00,0x00},/*"d",68*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x3C,0x42,0x42,0x7E,0x40,0x42,0x3C,0x00,0x00},/*"e",69*/

{0x00,0x00,0x00,0x00,0x0C,0x12,0x10,0x7C,0x10,0x10,0x10,0x10,0x10,0x7C,0x00,0x00},/*"f",70*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x3E,0x44,0x44,0x38,0x40,0x3C,0x42,0x42,0x3C},/*"g",71*/

{0x00,0x00,0x00,0x00,0xC0,0x40,0x40,0x5C,0x62,0x42,0x42,0x42,0x42,0xE7,0x00,0x00},/*"h",72*/

{0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x70,0x10,0x10,0x10,0x10,0x10,0x7C,0x00,0x00},/*"i",73*/

{0x00,0x00,0x00,0x0C,0x0C,0x00,0x00,0x1C,0x04,0x04,0x04,0x04,0x04,0x04,0x44,0x78},/*"j",74*/

{0x00,0x00,0x00,0x00,0xC0,0x40,0x40,0x4E,0x48,0x50,0x70,0x48,0x44,0xEE,0x00,0x00},/*"k",75*/

{0x00,0x00,0x00,0x10,0x70,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x7C,0x00,0x00},/*"l",76*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFE,0x49,0x49,0x49,0x49,0x49,0xED,0x00,0x00},/*"m",77*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xDC,0x62,0x42,0x42,0x42,0x42,0xE7,0x00,0x00},/*"n",78*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x3C,0x42,0x42,0x42,0x42,0x42,0x3C,0x00,0x00},/*"o",79*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xD8,0x64,0x42,0x42,0x42,0x64,0x58,0x40,0xE0},/*"p",80*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1A,0x26,0x42,0x42,0x42,0x26,0x1A,0x02,0x07},/*"q",81*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xEE,0x32,0x20,0x20,0x20,0x20,0xF8,0x00,0x00},/*"r",82*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x3E,0x42,0x40,0x3C,0x02,0x42,0x7C,0x00,0x00},/*"s",83*/

{0x00,0x00,0x00,0x00,0x00,0x10,0x10,0x7C,0x10,0x10,0x10,0x10,0x12,0x0C,0x00,0x00},/*"t",84*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC6,0x42,0x42,0x42,0x42,0x46,0x3B,0x00,0x00},/*"u",85*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xEE,0x44,0x44,0x28,0x28,0x10,0x10,0x00,0x00},/*"v",86*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xDB,0x89,0x4A,0x5A,0x54,0x24,0x24,0x00,0x00},/*"w",87*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x76,0x24,0x18,0x18,0x18,0x24,0x6E,0x00,0x00},/*"x",88*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xE7,0x42,0x24,0x24,0x18,0x18,0x10,0x10,0x60},/*"y",89*/

{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x7E,0x44,0x08,0x10,0x10,0x22,0x7E,0x00,0x00},/*"z",90*/

{0x00,0x03,0x04,0x04,0x04,0x04,0x04,0x04,0x08,0x04,0x04,0x04,0x04,0x04,0x03,0x00},/*"{",91*/

{0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08},/*"|",92*/

{0x00,0xC0,0x20,0x20,0x20,0x20,0x20,0x20,0x10,0x20,0x20,0x20,0x20,0x20,0xC0,0x00},/*"}",93*/

{0x20,0x5A,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"~",94*/
};

四、编译运行效果

 

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