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，在在图片的指定位置绘制中文。
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
};
/*
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 ;
}
}
}
unsigned char font[]=
{
/*-- 文字: 钱 --*/
/*-- 宋体36; 此字体下对应的点阵为：宽x高=48x48 --*/
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x70,0x00,0x3C,
0x00,0x00,0x00,0x78,0x00,0x3F,0x00,0x00,0x00,0x7E,0x00,0x3E,0x78,0x00,0x00,0xFC,
0x00,0x3C,0x3E,0x00,0x00,0xF8,0x00,0x3C,0x1F,0x80,0x00,0xF0,0x00,0x3C,0x0F,0x80,
0x00,0xF0,0x00,0x3C,0x07,0xC0,0x01,0xF0,0x70,0x3E,0x03,0x80,0x01,0xFF,0xF8,0x1E,
0x01,0x80,0x01,0xFF,0xFC,0x1E,0x03,0x00,0x03,0xC0,0x00,0x1E,0x07,0x80,0x03,0xC0,
0x00,0x1F,0xFF,0xC0,0x07,0x80,0x03,0xFF,0xFF,0x80,0x07,0x80,0x1F,0xFE,0x00,0x00,
0x07,0x01,0xCE,0x1E,0x00,0x00,0x0F,0xFF,0xE0,0x1E,0x00,0x00,0x0F,0xFF,0xF0,0x1E,
0x00,0x00,0x1C,0x3C,0x00,0x1F,0x00,0x70,0x38,0x3C,0x00,0x0F,0x00,0xF8,0x38,0x3C,
0x00,0x0F,0x3F,0xFC,0x70,0x3C,0x00,0x1F,0xFF,0xE0,0x20,0x3C,0x1F,0xFF,0xC0,0x00,
0x00,0x3C,0x1F,0xEF,0x01,0x80,0x00,0x3C,0x6C,0x0F,0x81,0xC0,0x1F,0xFF,0xF0,0x07,
0x83,0xE0,0x3F,0xFF,0xF8,0x07,0x87,0xF0,0x1E,0x3C,0x00,0x07,0x87,0xE0,0x00,0x3C,
0x00,0x07,0xCF,0x80,0x00,0x3C,0x00,0x03,0xDF,0x00,0x00,0x3C,0x00,0x03,0xFE,0x00,
0x00,0x3C,0x00,0x03,0xFC,0x00,0x00,0x3C,0x00,0x01,0xF8,0x0C,0x00,0x3C,0x18,0x01,
0xF0,0x0C,0x00,0x3C,0x78,0x03,0xF0,0x1C,0x00,0x3D,0xF0,0x0F,0xF8,0x1C,0x00,0x3F,
0xC0,0x1F,0x7C,0x1C,0x00,0x3F,0x80,0x3E,0x3E,0x3C,0x00,0x7F,0x00,0xFC,0x1F,0x3C,
0x00,0x7E,0x01,0xF0,0x0F,0xBC,0x00,0x7C,0x07,0xC0,0x07,0xFC,0x00,0x38,0x1F,0x00,
0x03,0xFC,0x00,0x10,0x7C,0x00,0x01,0xFC,0x00,0x00,0xE0,0x00,0x00,0xFC,0x00,0x00,
0x00,0x00,0x00,0x3C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
};
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=54 800*480*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_Data(font,48,48,head_p,bmp_info.w,10,10);
/*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;
}四、运行效果
代码语言：javascript复制[wbyq@wbyq linux_c]$ gcc app.c
[wbyq@wbyq linux_c]$ ./a.out 81 81 1.bmp
成功写入:14 字节.
成功写入:40 字节.
[wbyq@wbyq linux_c]$ eog 1.bmp
