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。
代码语言：javascript复制#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#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<w/8*h;i )
{
data=font[i];
for(j=0;j<8;j )
{
if(data&0x80) //画前景色
{
Display_Point(image_head,image_w,x0,y,0xFF0033);
}
else //画背景色
{
//Display_Point(image_head,image_w,x0,y,0x0066FF);
}
x0 ;
data<<=1;
}
if(x0-x==w) //换行
{
x0=x;
y ;
}
}
}
/*
函数功能: 绘制字符串的函数
函数参数:
char *str 要绘制的字符串 (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_String(char *str,int w,int h,char *image_head,int image_w,int x,int y)
{
while(*str!=' ')
{
if(*str>=' ' && *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>=48n");
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
