视频上叠加汉字点阵文字

在视频界面上写汉字往往是在GUI中写，但要想文字作为视频中的数据存储下来则要在帧buff中叠加汉字点阵，关于汉字点阵无非是区位码的计算问题，汉字占两个字节，英文一个字节。本文件调用了szHZK16和szASC16字库分别作为汉字和英文字库矩阵，例如：“经度”的“经”这个字在字库矩阵的位置用 "p16 = (unsigned short )Chinese[2738*32+2*j];p17 = (unsigned short )Chinese[2738*32+2*j+1]; "确定,这里的2738表示“经”位于字库中以32个元素为一组的第2739组。offsetY表示灰度值（0--255）

/**********************************
  sw_osd_yuv.c
  
**************************************/
#include 
#include "sw_osd_yuv.h"
#include "CharSet.h"
#include 



/*********************************************************** 
    Ô­ÐÍ: char* draw_font(FONT_DRAW_INFO_S * fontDrawInfo)
    ¹ŠÄÜ: ÊÓƵÉÏÈíµþŒÓ×ÖÄ» 
    args:   ptr_frame:      YUV420žñÊœ×Ö·ûÊý×飬
            str:            µþŒÓµÄ×Ö·ûŽ®£¬
            startx¡¢starty: µþŒÓµÄλÖã¬
            length:         µþŒÓ×Ö·ûµÄ³€¶È
            char*           µþŒÓ×Ö·ûºóµÄÊÓƵ
    return: 
*********************************************************/
int draw_font(FONT_DRAW_INFO_S * fontDrawInfo)
{
    int tagY=0,   tagU=0,    tagV=0;
    int startx=0, starty=0;
    int width=0,  heigh=0;
    int color=0,  length=0;
    unsigned char *ptr_frame=NULL;   
    unsigned char *offsetY=NULL,*offsetU=NULL,*offsetV=NULL;
    unsigned short p16, p17, mask16; // for reading hzk16 dots
    const  char *p = fontDrawInfo->str;
    static int cnt=0;
/* -------------------info-----------------------------------------------------*/

    POSIT_S positInfo;
     if(cnt++%25==0 ){
 	GetDetectData(&positInfo);
   
    	printf("lon:%s*  lat:%s*  az:%s*  pitch:%s*  dist:%s*   %s\n",
                     (char *)(positInfo.lon), (char *)(positInfo.lat),
                     (char *)(positInfo.pitch),  (char *)(positInfo.az),
                     (char *)(positInfo.dist),__FILE__);
	}

    const  char *p1 = positInfo.lon;        // longitude:   123°44'50"E or 123.44.50 E
    const  char *p2 = positInfo.lat;
    const  char *p3 = positInfo.az;
    const  char *p4 = positInfo.pitch;
    const  char *p5 = positInfo.dist;

    unsigned char *Chinese = (unsigned char *)szHZK16;
    unsigned char *English = (unsigned char *)szASC16;

    if( NULL == fontDrawInfo || 
        NULL == fontDrawInfo->buf ||
        NULL == fontDrawInfo->str ){
        printf("args invalid: fontDrawInfo:%d  .buf:%d .str:%d.\n",
            (int)fontDrawInfo,
            (int)fontDrawInfo->buf,
            (int)fontDrawInfo->str);        
        return -1;
    }else if( 0==fontDrawInfo->len){
        printf("None string to need draw.\n");
        return 0;
    }else{
        startx=fontDrawInfo->x, starty=fontDrawInfo->y;
        width=fontDrawInfo->w,  heigh =fontDrawInfo->h;
        color=fontDrawInfo->color, length=fontDrawInfo->len;
        ptr_frame=fontDrawInfo->buf;
        //p = fontDrawInfo->str;

    }
        
    //yuv µØÖ·µÄÉèÖÃ
    //assert( ptr_frame != NULL );    
    offsetY = ptr_frame;
    offsetU = offsetY + width * heigh;
    offsetV = offsetU + width * heigh/4;
    //RGB_Y=0,	RGB_R=1,RGB_G=2,RGB_B=3,RGB_w=4,	
    switch (color)
    {
        case 0:         // Yellow
            tagY = 226;tagU = 0;tagV = 149;
            break;
        case 1:         // Red
            tagY = 0;tagU = 85;tagV = 255;
            break;
        case 2:         // Green
            tagY = 150;tagU = 44;tagV = 21;
            break;
        case 3:         // Blue
            tagY = 29;tagU = 255;tagV = 107;
            break;
        case 4:         // White
            tagY = 128;tagU = 128;tagV = 128; 

	default:        // black
            tagY = 0;tagU = 0;tagV = 0;      
    }


        
    int x=0,y=0,i=1,j=0,k=0;

/*         --------------------------英文：经度值------------------------------------------------*/
    for(i = 0; i < 12; i++)
    {
        // line dots per char
        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)
        {
            p16 = (unsigned short )English[(*p1)*16+j];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 32 +i*8; k < 8 && x < startx + 32 +i*8+8; k++, x+=1)
            {
                if (p16 & mask16)
                {
                    *(offsetY + y*width + x) = tagY;                 
                }
                else{
                    //*(offsetY + y*width + x) = 1; //black
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;// half-trans
                }
                
                mask16 = mask16 >> 1;  //Ñ­»·ÒÆλȡÊýŸÝ
                if (mask16 == 0)
                    mask16 = 0x8000;             
            }         
        }
        
        p1++; 
    } 

/*         --------------------------英文：纬度值------------------------------------------------*/
    for(i = 0; i < 12; i++)
    {
        // line dots per char
        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)
        {
            p16 = (unsigned short )English[(*p2)*16+j];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 32 +128 +i*8; k < 8 && x < startx + 32 +128 +i*8+8; k++, x+=1)
            {
                if (p16 & mask16)
                {
                    *(offsetY + y*width + x) = tagY;                 
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;           
    
                mask16 = mask16 >> 1;  //Ñ­»·ÒÆλȡÊýŸÝ
                if (mask16 == 0)
                    mask16 = 0x8000;             
            }         
        }
        
        p2++; 
    } 
 
/*         --------------------------英文：倾角值------------------------------------------------*/
    for(i = 0; i < 12; i++)
    {
        // line dots per char
        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)
        {
            p16 = (unsigned short )English[(*p3)*16+j];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 32 +256 +i*8; k < 8 && x < startx + 32 +256 +i*8+8; k++, x+=1)
            {
                if (p16 & mask16)
                {
                    *(offsetY + y*width + x) = tagY;                 
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;
                
                mask16 = mask16 >> 1;  //Ñ­»·ÒÆλȡÊýŸÝ
                if (mask16 == 0)
                    mask16 = 0x8000;             
            }         
        }
        
        p3++; 
    } 

/*         --------------------------英文：方位值------------------------------------------------*/
    for(i = 0; i < 12; i++)
    {
        // line dots per char
        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)
        {
            p16 = (unsigned short )English[(*p4)*16+j];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 32 +384 +i*8; k < 8 && x < startx + 32 +384 +i*8+8; k++, x+=1)
            {
                if (p16 & mask16)
                {
                    *(offsetY + y*width + x) = tagY;
                 
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;
                
                mask16 = mask16 >> 1;  //Ñ­»·ÒÆλȡÊýŸÝ
                if (mask16 == 0)
                    mask16 = 0x8000;             
            }         
        }
        
        p4++; 
    } 
 
/*         --------------------------英文：距离值------------------------------------------------*/
    for(i = 0; i < 8; i++)
    {
        // line dots per char
        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)
        {
            p16 = (unsigned short )English[(*p5)*16+j];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 32 +512 +i*8; k < 8 && x < startx + 32 +512 +i*8+8; k++, x+=1)
            {
                if (p16 & mask16)
                {
                    *(offsetY + y*width + x) = tagY;                
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;
                
                mask16 = mask16 >> 1;  //Ñ­»·ÒÆλȡÊýŸÝ
                if (mask16 == 0)
                    mask16 = 0x8000;             
            }         
        }
        
        p5++; 
    } 
                              
/*         --------------------------汉字：经度-------------------------------------------------*/
        // line dots per char
        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)//heigh - 1
        {
            //p16 = (unsigned short )Chinese[(*p)*16+j];
p16 = (unsigned short )Chinese[2738*32+2*j];
p17 = (unsigned short )Chinese[2738*32+2*j+1];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx ; k < 8 && x < startx +8; k++, x+=1)//width - 1
            {
                if (p16 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                 
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;
                    
            }  
            for (k = 0, x = startx +8; k < 8 && x < startx +16; k++, x+=1)//width - 1
            {
                if (p17 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;                 
            }               
        }

        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)//heigh - 1
        {
            //p16 = (unsigned short )table[(*p)*16+j];
p16 = (unsigned short )Chinese[2013*32+2*j];
p17 = (unsigned short )Chinese[2013*32+2*j+1];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 16; k < 8 && x < startx + 16+8;  k++, x+=1)//width - 1
            {
                if (p16 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                 
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;          
            }  
            for (k = 0, x = startx + 16+8; k < 8 && x < startx + 16+16; k++, x+=1)//width - 1
            {
                if (p17 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY; //= *(offsetY + y*width + x+1)
                   // *(offsetY + (y+1)*width + x) = *(offsetY + (y+1)*width + x+1) = tagY;
                   // *(offsetU + y * width/4 + x/2) =tagU;
                   // *(offsetV + y * width/4 + x/2) = tagV;                 
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;               
            }               
        }

/*         --------------------------汉字：纬度-------------------------------------------------*/
        // line dots per char
        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)//heigh - 1
        {
            //p16 = (unsigned short )table[(*p)*16+j];
p16 = (unsigned short )Chinese[4248*32+2*j];
p17 = (unsigned short )Chinese[4248*32+2*j+1];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 128; k < 8 && x < startx +8 + 128; k++, x+=1)//width - 1
            {
                if (p16 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                  
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;               
            }  
            for (k = 0, x = startx +8 + 128; k < 8 && x < startx +16 + 128; k++, x+=1)//width - 1
            {
                if (p17 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                  
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;            
            }               
        }

        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)//heigh - 1
        {
            //p16 = (unsigned short )table[(*p)*16+j];
p16 = (unsigned short )Chinese[2013*32+2*j];
p17 = (unsigned short )Chinese[2013*32+2*j+1];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 16 + 128; k < 8 && x < startx + 16+8 + 128;  k++, x+=1)//width - 1
            {
                if (p16 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                 
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;           
            }  
            for (k = 0, x = startx + 16+8 + 128; k < 8 && x < startx + 16+16 + 128; k++, x+=1)//width - 1
            {
                if (p17 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                 
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;            
            }               
        }

/*         --------------------------汉字：倾角-------------------------------------------------*/
        // line dots per char
        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)//heigh - 1
        {
            //p16 = (unsigned short )table[(*p)*16+j];
p16 = (unsigned short )Chinese[3638*32+2*j];
p17 = (unsigned short )Chinese[3638*32+2*j+1];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 256; k < 8 && x < startx +8 + 256; k++, x+=1)//width - 1
            {
                if (p16 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                 
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;          
            }  
            for (k = 0, x = startx +8 + 256; k < 8 && x < startx +16 + 256; k++, x+=1)//width - 1
            {
                if (p17 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;         
            }               
        }

        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)//heigh - 1
        {
            //p16 = (unsigned short )table[(*p)*16+j];
p16 = (unsigned short )Chinese[2670*32+2*j];
p17 = (unsigned short )Chinese[2670*32+2*j+1];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 16 + 256; k < 8 && x < startx + 16+8 + 256;  k++, x+=1)//width - 1
            {
                if (p16 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;          
            }  
            for (k = 0, x = startx + 16+8 + 256; k < 8 && x < startx + 16+16 + 256; k++, x+=1)//width - 1
            {
                if (p17 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;       
            }               
        }

/*         --------------------------汉字：方位-------------------------------------------------*/
        // line dots per char
        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)//heigh - 1
        {
            //p16 = (unsigned short )table[(*p)*16+j];
p16 = (unsigned short )Chinese[2096*32+2*j];
p17 = (unsigned short )Chinese[2096*32+2*j+1];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 384; k < 8 && x < startx +8 + 384; k++, x+=1)//width - 1
            {
                if (p16 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                 
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;     
            }  
            for (k = 0, x = startx +8 + 384; k < 8 && x < startx +16 + 384; k++, x+=1)//width - 1
            {
                if (p17 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;             
            }               
        }

        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)//heigh - 1
        {
            //p16 = (unsigned short )table[(*p)*16+j];
p16 = (unsigned short )Chinese[4256*32+2*j];
p17 = (unsigned short )Chinese[4256*32+2*j+1];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 16 + 384; k < 8 && x < startx + 16+8 + 384;  k++, x+=1)//width - 1
            {
                if (p16 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;                
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;       
            }  
            for (k = 0, x = startx + 16+8 + 384; k < 8 && x < startx + 16+16 + 384; k++, x+=1)//width - 1
            {
                if (p17 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;               
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;
            }               
        }

/*         --------------------------汉字：距离-------------------------------------------------*/
        // line dots per char
        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)//heigh - 1
        {
            //p16 = (unsigned short )table[(*p)*16+j];
p16 = (unsigned short )Chinese[2789*32+2*j];
p17 = (unsigned short )Chinese[2789*32+2*j+1];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 512; k < 8 && x < startx +8 + 512; k++, x+=1)//width - 1
            {
                if (p16 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;              
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;     
            }  
            for (k = 0, x = startx +8 + 512; k < 8 && x < startx +16 + 512; k++, x+=1)//width - 1
            {
                if (p17 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;               
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;      
            }               
        }

        for (j = 0, y = starty; j < 16 && y < starty+16; j++, y+=1)//heigh - 1
        {
            //p16 = (unsigned short )table[(*p)*16+j];
p16 = (unsigned short )Chinese[2988*32+2*j];
p17 = (unsigned short )Chinese[2988*32+2*j+1];
            mask16 = 0x0080;  // ¶þœøÖÆ 1000 0000
            
            // dots in a line
            for (k = 0, x = startx + 16 + 512; k < 8 && x < startx + 16+8 + 512;  k++, x+=1)//width - 1
            {
                if (p16 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;               
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;  
            }  
            for (k = 0, x = startx + 16+8 + 512; k < 8 && x < startx + 16+16 + 512; k++, x+=1)//width - 1
            {
                if (p17 & (mask16 >> k))
                {
                    *(offsetY + y*width + x) = tagY;             
                }
                else
                    *(offsetY + y*width + x) = *(offsetY + y*width + x)*5/6 + 42;     
            }               
        }


    return 0;

}