嵌入式开发之字符叠加---gb2313 国标码,utf8 国际码,unicode 无码
(1)国标码简介
(2)编码转换
(3)时间获取
(4)显示切换
最近做了个字符叠加,包括时间叠加,字符中文叠加,位置移动,等功能开启。因为一般的字符叠加的点阵式16位,然后填充着16位的编码是gb2313编码,比如说视讯两个字,
先是视:
编码类型 | 二进制编码 | 十六进制编码 |
Unicode | 10001001 11000110 | 0x89C6 |
UTF-8 | 11101000 10100111 10000110 | 0xE8A786 |
GB2312 | 11001010 11010011 | 0xCAD3 |
然后讯:
编码类型 | 二进制编码 | 十六进制编码 |
Unicode | 10001011 10101111 | 0x8BAF |
UTF-8 | 11101000 10101110 10101111 | 0xE8AEAF |
GB2312 | 11010001 10110110 | 0xD1B6 |
gb2313国标是占用两个字节一个字,国际标utf8是三个字节一个字,
http://lijunlisu.blog.163.com/blog/static/1639814282012710101844158/
http://www.cnblogs.com/windtail/archive/2012/08/26/2657485.html
http://baike.baidu.com/link?url=CNP55LTT8JmvtkmmQm_Jy-KOLa2zh0_LtTqMpNDL_wepPK3gcqVHpRuX1USESsO4yPC_haMoplNMz34qspE0hK 汉子国标码
然后网页端提交过来给web 服务器的cgi 收到的数据是utf8而且字体间还带百分号间隔符,
编码换算在线查找网站:
http://www.mytju.com/classcode/tools/encode_gb2312.asp
http://www.2fz1.com/so/
(2)编码换算
由于web端获取的文字编码是utf8,而点阵用的是gb2314,这里的坐下换算,将16进制的字符串转换成对应的数字!
将一个十六进制数的字符串表示形式转换成对应的整数。所谓的十六进制数的字符串形式是指字符串只包含'0'-'9'或者'a'-'z'或者'A'-'Z',前导“0x”或者“0X”是否出现都可以。
要解决这个问题,还需要一个将大写字母转换成小写字母的工具函数:
- /*将大写字母转换成小写字母*/
- int tolower(int c)
- {
- if (c >= 'A' && c <= 'Z')
- {
- return c + 'a' - 'A';
- }
- else
- {
- return c;
- }
- }
下面是转换函数:
- //将十六进制的字符串转换成整数
- int htoi(char s[])
- {
- int i;
- int n = 0;
- if (s[0] == '0' && (s[1]=='x' || s[1]=='X')) //判断是否有前导0x或者0X
- {
- i = 2;
- }
- else
- {
- i = 0;
- }
- for (; (s[i] >= '0' && s[i] <= '9')
- || (s[i] >= 'a' && s[i] <= 'z') || (s[i] >='A' && s[i] <= 'Z');++i)
- {
- if (tolower(s[i]) > '9')
- {
- n = 16 * n + (10 + tolower(s[i]) - 'a');
- }
- else
- {
- n = 16 * n + (tolower(s[i]) - '0');
- }
- }
- return n;
- }
- 编码转换:
-
void UTF_8ToUnicode(wchar_t* pOut,char *pText)
{
char* uchar = (char *)pOut;
uchar[1] = ((pText[0] & 0x0F) << 4) + ((pText[1] >> 2) & 0x0F);
uchar[0] = ((pText[1] & 0x03) << 6) + (pText[2] & 0x3F);
}
void UnicodeToUTF_8(char* pOut,wchar_t* pText)
{
// 注意 WCHAR高低字的顺序,低字节在前,高字节在后
char* pchar = (char *)pText;
pOut[0] = (0xE0 | ((pchar[1] & 0xF0) >> 4));
pOut[1] = (0x80 | ((pchar[1] & 0x0F) << 2)) + ((pchar[0] & 0xC0) >> 6);
pOut[2] = (0x80 | (pchar[0] & 0x3F));
}
void UnicodeToGB2312(char* pOut,wchar_t uData)
{
WideCharToMultiByte(CP_ACP,NULL,&uData,1,pOut,sizeof(wchar_t),NULL,NULL);
}
void Gb2312ToUnicode(wchar_t* pOut,char *gbBuffer)
{
::MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,gbBuffer,2,pOut,1);
}
void GB2312ToUTF_8(string& pOut,char *pText, int pLen)
{
char buf[4] = {0};
int nLength = pLen* 3;
char* rst = new char[nLength];
memset(rst,0,nLength);
int i = 0 ,j = 0;
while(i < pLen)
{
//如果是英文直接复制就可以
if( *(pText + i) >= 0)
{
rst[j++] = pText[i++];
}
else
{
wchar_t pbuffer;
Gb2312ToUnicode(&pbuffer,pText+i);
UnicodeToUTF_8(buf,&pbuffer);
rst[j] = buf[0];
rst[j+1] = buf[1];
rst[j+2] = buf[2];
j += 3;
i += 2;
}
}rst[j] ='\n'; //返回结果
pOut = rst;
delete []rst;
return;
}
void UTF_8ToGB2312(char*pOut, char *pText, int pLen)
{
char Ctemp[4];
memset(Ctemp,0,4);
int i =0 ,j = 0;
while(i < pLen)
{
if(pText[i] >= 0)
{
pOut[j++] = pText[i++];
}
else
{
WCHAR Wtemp;
UTF_8ToUnicode(&Wtemp,pText + i);
UnicodeToGB2312(Ctemp,Wtemp);
pOut[j] = Ctemp[0];
pOut[j + 1] = Ctemp[1];
i += 3;
j += 2;
}
}
pOut[j] ='\n';
return;
} -
http://www.linuxidc.com/Linux/2012-01/51571.htm
http://blog.163.com/lyq_163_2009/blog/static/13408269620116752322992/
http://blog.csdn.net/yeyuangen/article/details/6722193
http://blog.csdn.net/searchsun/article/details/2443867 yuv格式详解
http://www.cnblogs.com/skywang12345/p/3360348.html
http://blog.csdn.net/shen_001/article/details/7785713 opengl
http://blog.csdn.net/shen_001/article/details/7818972
http://blog.csdn.net/hitexam/article/details/5996607
(3)时间获取
a8 linux 端的时间获取容易直接调用localtime函数,但是dsp m3端的数据获取则只能通过util_time,获取自开机开始的定时时间,并没有从a8端获取准确时间,做的时候以为dsp端能获取时间,后面发现没有时间获取,发现之前的ipnc也是从a8端通过消息发送过来的,所以最后也是通过数据结构体把整个时间获取过来从dsp,
dsp 端的秒换算:
/* * 毫秒转化 */ public static String formatTime(long ms) { int ss = 1000; int mi = ss * 60; int hh = mi * 60; int dd = hh * 24; long day = ms / dd; long hour = (ms - day * dd) / hh; long minute = (ms - day * dd - hour * hh) / mi; long second = (ms - day * dd - hour * hh - minute * mi) / ss; long milliSecond = ms - day * dd - hour * hh - minute * mi - second * ss; String strDay = day < 10 ? "0" + day : "" + day; //天 String strHour = hour < 10 ? "0" + hour : "" + hour;//小时 String strMinute = minute < 10 ? "0" + minute : "" + minute;//分钟 String strSecond = second < 10 ? "0" + second : "" + second;//秒 String strMilliSecond = milliSecond < 10 ? "0" + milliSecond : "" + milliSecond;//毫秒 strMilliSecond = milliSecond < 100 ? "0" + strMilliSecond : "" + strMilliSecond; return strMinute + " 分钟 " + strSecond + " 秒"; }
http://www.educity.cn/wenda/307912.html
http://blog.csdn.net/fuxiaohui/article/details/25505823
http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/p/300747/1048610
http://www.deyisupport.com/question_answer/dsp_arm/davinci_digital_media_processors/f/39/t/67246.aspx 潘哥哥 吼吼!
http://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&tn=baidu&wd=8148%20m3%20time&rsv_pq=bda1d8430003d3c6&rsv_t=b4a1GGNFu6c4DQJDxpoJ24o5SVfYK1%2BUvQhz4DOtkNLPQrCQ0P5%2FsAlbY6k&rsv_enter=1&inputT=1233&rsv_sug3=25&rsv_sug4=2728&rsv_sug2=0
http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/271976
http://www.360doc.com/content/12/0306/17/19692_192255025.shtml
http://net.pku.edu.cn/~yhf/linux_c/function/02.html
http://blog.donews.com/quickmouse/archive/2008/05/08/1287733.aspx
http://blog.donews.com/quickmouse/archive/2008/05/08/1287733.aspx
(4)显示切换
这次做布局显示切换时发现,48的功能还是挺强大的,可以做任意矩形图布局,而且还可以做屏幕叠加。
http://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&tn=baidu&wd=8148%20m3%20time&rsv_pq=bda1d8430003d3c6&rsv_t=b4a1GGNFu6c4DQJDxpoJ24o5SVfYK1%2BUvQhz4DOtkNLPQrCQ0P5%2FsAlbY6k&rsv_enter=1&inputT=1233&rsv_sug3=25&rsv_sug4=2728&rsv_sug2=0
http://www.deyisupport.com/question_answer/dsp_arm/davinci_digital_media_processors/f/39/t/17971.aspx m3端的地址转换
http://www.deyisupport.com/question_answer/dsp_arm/davinci_digital_media_processors/f/39/t/54118.aspx display
http://www.deyisupport.com/question_answer/dsp_arm/davinci_digital_media_processors/f/39/t/59513.aspx display link
http://www.deyisupport.com/question_answer/dsp_arm/davinci_digital_media_processors/f/39/p/18848/63772.aspx 12路解码
树莓派
http://www.2fz1.com/