本文介绍了一个将24位BMP图像转换为适用于嵌入式系统的点阵数组的方法，包括水平扫描和垂直扫描两种方式。通过C语言程序实现，详细展示了如何解析BMP文件并将其转化为易于嵌入式设备显示的点阵数据。
本来朋友有一个移动和联通的logo点阵，现在突然需要电信的logo，所以就跟他要来了，移动和电信的logo数据，试着显示出来，其实也就是每个字节有8个点，1为显示的点，0不显示！麻烦的就是有要水平扫描和垂直扫描！
所以就写了下面的程序，这个程序是未成品，我只弄了40*40的位图，而且是24位的bmp图片，其它的只要查看一下bmp文件格式，很容易就可以修改了！（生成的数据在文件里）
有兴趣你也可以试一下！
恢复样子：
电信logo文件：放在和程序的目录下(文件被我改后辍了，不然不能上传，把后面的“.jpg”去掉就好了)
代码入下：
- #include "stdio.h"
- #include "stdlib.h"
- // 数据表 水平扫描
- const unsigned char unicomLogo[] =
- {
- 56,41,
- 0x00,0x00,0x0C,0x00,0x60,0x00,0x00,0x00,0x00,0x7F,0x81,0xFC,0x00,0x00,0x00,0x00,
- 0xFF,0xC3,0xFE,0x00,0x00,0x00,0x01,0xFF,0xE7,0xFF,0x00,0x00,0x00,0x01,0xF3,0xFF,
- 0xCF,0x00,0x00,0x00,0x03,0xE1,0xFF,0x07,0x80,0x00,0x00,0x03,0xC0,0xFE,0x07,0x80,
- 0x00,0x00,0x03,0xC0,0xFE,0x07,0x80,0x00,0x00,0x03,0xE1,0xFF,0x0F,0x80,0x00,0x00,
- 0x01,0xF3,0xFF,0x9F,0x00,0x00,0x00,0x01,0xF9,0xEF,0x3F,0x00,0x00,0x00,0x00,0xFC,
- 0xC6,0x7E,0x00,0x00,0x00,0x00,0x7E,0x00,0xFC,0x00,0x00,0x00,0x00,0x3F,0x01,0xF8,
- 0x00,0x00,0x07,0xC0,0x1F,0x83,0xF0,0x07,0xC0,0x1F,0xF0,0xCF,0xC7,0xE6,0x0F,0xF0,
- 0x3F,0xF9,0xE7,0xE7,0xCF,0x3F,0xF8,0x3F,0xFF,0xF3,0xFF,0x9F,0xFF,0xFC,0x7C,0x7F,
- 0xE1,0xFF,0x0F,0xFC,0x7C,0x78,0x1F,0xC0,0x7E,0x07,0xF8,0x3C,0x78,0x1F,0x80,0xFE,
- 0x03,0xF0,0x3C,0x78,0x3F,0xC0,0xFF,0x07,0xFC,0x3C,0x7C,0xFF,0xE1,0xFF,0x8F,0xFE,
- 0x7C,0x3F,0xFD,0xF3,0xEF,0xCF,0xBF,0xF8,0x1F,0xF0,0xE7,0xC7,0xE7,0x1F,0xF0,0x0F,
- 0xE0,0x4F,0x83,0xF2,0x0F,0xF0,0x03,0x80,0x1F,0x01,0xF0,0x03,0xC0,0x00,0x00,0x3E,
- 0x00,0xFC,0x00,0x00,0x00,0x00,0x7C,0xC6,0x7C,0x00,0x00,0x00,0x00,0xF8,0xC6,0x3E,
- 0x00,0x00,0x00,0x01,0xF3,0xFF,0x9F,0x00,0x00,0x00,0x01,0xF3,0xFF,0x8F,0x00,0x00,
- 0x00,0x03,0xE0,0xFE,0x0F,0x80,0x00,0x00,0x03,0xE0,0xFE,0x07,0x80,0x00,0x00,0x03,
- 0xE1,0xFF,0x07,0x80,0x00,0x00,0x03,0xF1,0xFF,0x8F,0x80,0x00,0x00,0x01,0xFF,0xEF,
- 0xFF,0x00,0x00,0x00,0x00,0xFF,0xC7,0xFF,0x00,0x00,0x00,0x00,0x7F,0x83,0xFC,0x00,
- 0x00,0x00,0x00,0x1F,0x00,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
- };
- // 数据表 垂直扫描
- const unsigned char cmccLogo[] =
- {
- 48,40,
- 0x00,0x00,0xff,0x00,0x00,0x00,0x00,0xe0,0xff,0x07,0x00,0x00,0x00,0xf8,0xff,0x1f,
- 0x00,0x00,0x00,0xfe,0xff,0x7f,0x00,0x00,0x00,0xff,0xff,0xff,0x00,0x00,0xc0,0x3f,
- 0x63,0xfc,0x01,0x00,0xc0,0x1f,0xe7,0xf8,0x03,0x00,0xe0,0x0f,0xce,0xf1,0x07,0x00,
- 0xf0,0x07,0x9c,0xf1,0x0f,0x00,0xf8,0x07,0x39,0xe3,0x0f,0x00,0xf8,0x83,0x71,0xc6,
- 0x1f,0x00,0xfc,0xc1,0x71,0x8e,0x3f,0x00,0xfc,0xe0,0xe1,0x1c,0x3f,0x00,0x7e,0xf0,
- 0xc0,0x19,0x3f,0x00,0x3e,0x70,0x98,0x33,0x7e,0x00,0x3e,0x38,0x98,0x73,0x7c,0x00,
- 0x1f,0x1c,0x0c,0xe3,0x78,0x00,0x0f,0x0e,0x06,0xe3,0x78,0x00,0x0f,0x07,0x87,0xe1,
- 0x70,0x00,0x0f,0x87,0xc1,0xe1,0x70,0x00,0x8f,0xc3,0xe1,0x70,0x70,0x00,0x8f,0xc3,
- 0x70,0x38,0x78,0x00,0x8f,0x63,0x30,0x38,0x78,0x00,0x1e,0xe7,0x18,0x1c,0x7c,0x00,
- 0x3e,0xe7,0x0c,0x0e,0x7e,0x00,0x3e,0xce,0x01,0x07,0x3f,0x00,0x7c,0x9c,0x81,0x03,
- 0x3f,0x00,0xfc,0x98,0xc3,0x81,0x3f,0x00,0xfc,0x31,0xe7,0xc1,0x1f,0x00,0xf8,0x71,
- 0xce,0xe0,0x1f,0x00,0xf0,0xe3,0x1c,0xf0,0x0f,0x00,0xf0,0xc7,0x39,0xf8,0x07,0x00,
- 0xe0,0x8f,0x31,0xf8,0x07,0x00,0xc0,0x1f,0x63,0xfc,0x03,0x00,0x80,0x3f,0xe7,0xfe,
- 0x01,0x00,0x00,0xff,0xff,0x7f,0x00,0x00,0x00,0xfc,0xff,0x3f,0x00,0x00,0x00,0xf0,
- 0xff,0x0f,0x00,0x00,0x00,0x80,0xff,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
- };
- #define MAX_BACK_COLOR 180 //颜色值
- #define BMP_W_H 40 //准备转换的颜色的大小，也可以弄动态获取，但最近有点忙就不加上了
- #define BUF_MAX_SIZE 10000
- unsigned char bmpinf[BUF_MAX_SIZE];//保存整张图片，按16进制读取
- int bmp_data_start = 0; //图像的数据偏移位置，bmp的第10位开始，一共4位，低位在前，可参考bmp文件格式说明
- int bmpInfLen = 0; //bmpinf数组已用空间
- //画水平logo的
- int hexLogView_horizontal(const unsigned char loghex[],int size)
- {
- int w,h,pos,i,j;
- if(loghex ==NULL)
- return 1;
- //获取宽高
- w = loghex[0]/8;
- h = loghex[1];
- printf("/nsize of logo = %d/n",size);
- printf("logo view: /n/t");
- //从第三个开始，前两个为宽高
- pos = 2;
- //打印logo
- while(pos < size)//查到是否还有数据
- {
- for(i = 0; i < w; i++)//这个宽为数据高，（因为一个数据有8位）
- {
- for(j = 7; j >0; j--)//数据，高位在左，所以从第8位（最高位）开始
- {
- if((loghex[pos+i]>>j)&0x1)//计算数据位置
- printf("%c",64);//为1时，画@
- else
- printf("%c",32);//为0时，空格
- }
- }
- printf("/n/t");
- pos +=w;//下一行
- }
- return 0;
- }
- int hexLogView_vertical(const unsigned char loghex[],int size)
- {
- int w,h,pos,i,j,k;
- if(loghex ==NULL)
- return 1;
- //获取宽高
- w = loghex[0]/8;
- h = loghex[1];
- printf("/nsize of logo = %d/n",size);
- printf("logo view: /n/t");
- //从第三个开始，前两个为宽高
- pos = 2;
- //这里的数据第一行实际上是第一列
- //而我们无法按一列一列来画，所以我们选择先每一列的第一个，然后第二个。。。
- for(j = 0; j < w; j++)//每一列（这里把8位数据做为一大列）
- {
- for(k = 0 ; k < 8;k ++)//每一位
- {
- for(i = 0; i < h; i++)//每一行
- {
- //printf("%d-%d,",pos+j+5*i,k);
- if( (loghex[pos+ j + w*i]>>k) & 0x01)//计算数据位置
- printf("%c",64);//为1时，画@
- else
- printf("%c",32);//为0时，空格
- }
- printf("/n/t");
- }
- }
- printf("/n");
- return 0;
- }
- //把bmp的所有数据按16进制读出来
- int bmpTohex(char *in_file, char * out_file,unsigned char bmpinf[])
- {
- int ch,i = 0,j = 0;
- FILE * fi,*fo;
- //打开文件
- fi = fopen(in_file,"r");
- fo = fopen(out_file,"w+");
- if(fi == NULL ||fo == NULL)
- {
- printf("can't open file !/n");
- exit(1);
- }
- fprintf(fo,"const unsigned char logoInfHex =/n{/n/t");
- //一直读取，直到bmp文件结束（EOF）
- //注意，在我读取时，有时16进制为“1A”时会被读成EOF，所以我用UltraEdit把“0A”改成了“0B”
- while((ch = fgetc(fi)) != EOF)
- {
- fprintf(fo,"0x%02x,",ch);
- bmpinf[j] =ch;//把图像同时保存在全局变量里
- i++;
- if(i == 16)//输出到文件时，16个数据为一行
- {
- fprintf(fo,"/n/t");
- i = 0;
- }
- j++;
- }
- fprintf(fo,"/n};");
- printf("bmp size : %d",j);
- return j;//返回数据长度
- }
- //把bmp文件数据转换成数组，分别在hexLogo_horizontal.txt和hexLogo_vertical.txt两个文件中
- //一个是水平扫描，一个垂直扫描
- void bmpInfToArray(char bmpInf[])
- {
- int i,j,k,a;
- char tmp[BUF_MAX_SIZE];
- char bmp[BMP_W_H][BMP_W_H];
- FILE *fo,*fo4;
- fo = fopen("hexLogo_horizontal.txt","w+");
- fo4 = fopen("hexLogo_vertical.txt","w+");
- fprintf(fo,"/*hexLogo_horizontal*//n");
- fprintf(fo,"const unsigned char horizontal_logo[] =/n{/n/t %d,%d,/n/t",BMP_W_H,BMP_W_H);
- fprintf(fo4,"/*hexLogo_vertical*//n");
- fprintf(fo4,"const unsigned char vertical_logo[] =/n{/n/t %d,%d,/n/t",BMP_W_H,BMP_W_H);
- //计算偏移量，偏移量后面就是图像的具体数据
- //bmp的格式太多，我这里用的是24位时的，其它的可以参考相关资料修改，不难
- bmp_data_start = (bmpinf[13]<<24) + (bmpinf[12]<<16) +(bmpinf[11]<<8) + bmpinf[10];
- k = -1;//数据到单色数组
- for(i = bmp_data_start;i < bmpInfLen;)
- {
- k++;
- tmp[k] = 0;//默认为0，无色块
- for(j =0; j < 3; j++)
- {
- a = i+j;
- if(bmpinf[a] < MAX_BACK_COLOR)//只要有任意一个颜色值小于MAX_BACK_COLOR，就把它当然有颜色的，（因为3个都为255时是白色）
- {
- tmp[k] = 1; //
- }
- }
- i += 3;//24位时，3个字节（3原色）为一个点
- //bmp是按行存储的，并且是行序是倒过来的
- //还有一点就是因为bmp每一行都要求是4的整数倍，所以其实图像大小时要记得做相关处理（我选取40*40，列数是40，无须处理）
- //举个例子 ，3*3的位图
- //每一行不是3*3字节，面是有4*3个字节，最后的3字节是无用的！
- }
- a = 0;
- k = 0;
- //水平扫描数据输出
- //因为行序是倒序，所以我们倒着转存
- for (i = BMP_W_H -1; i >= 0 ; i--)
- {
- for(j = 0 ; j < BMP_W_H; j++)
- {
- a = a*2 | tmp[i*40+j];//每8位为一个数据
- k++;
- if((j+1)% 8 == 0)//每8位为一个数据
- {
- fprintf(fo,"0x%02x,",a);a = 0;k = 0;//输出数据
- }
- }
- if(i%2 == 0)
- fprintf(fo,"/n/t");
- }
- fprintf(fo,"/n};");
- //在这里先把图像，下面就比较文便处理了
- for(i = 0; i < BMP_W_H; i++)
- for(j = 0; j < BMP_W_H; j++)
- {
- bmp[i][j] = 0;
- if(i > 1)
- {
- bmp[i][j] = tmp[(BMP_W_H -1 - i)*40+j];//下上反转过来
- }
- }
- //垂直扫描数据输出
- for (j = 0,a = 0; j < BMP_W_H; j++) //按列来保存
- {
- for(i = 0 ; i < BMP_W_H/8; i++)//每一列的的每个数据（8位）
- {
- a = a*2 | bmp[i*8 +7][j];//这里是高位在下（如果高位在中的话0到7倒置就好了）
- a = a*2 | bmp[i*8 +6][j];
- a = a*2 | bmp[i*8 +5][j];
- a = a*2 | bmp[i*8 +4][j];
- a = a*2 | bmp[i*8 +3][j];
- a = a*2 | bmp[i*8 +2][j];
- a = a*2 | bmp[i*8 +1][j];
- a = a*2 | bmp[i*8 +0][j];
- fprintf(fo4,"0x%02x,",a);//输出数据
- a = 0;
- }
- fprintf(fo4,"/n/t");
- }
- fprintf(fo4,"/n};");
- }
- int main(void)
- {
- hexLogView_horizontal(unicomLogo,sizeof(unicomLogo)-1);//联通的logo，水平扫描的
- hexLogView_vertical(cmccLogo,sizeof(cmccLogo));//移动的logo，垂直扫描的
- bmpInfLen = bmpTohex("logo.bmp","logo.txt",bmpinf);//把logo.bmp文件按16进制读取然后写入到文件logo.txt和全局数组bmpinf中
- bmpInfToArray(bmpinf);//全局数组bmpinf中的数据按水平和垂直扫描方式转换成数组分别存到两个文件中
- }
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