点阵字库放大算法（中文和英文）

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我是靠谱客的博主独特树叶，这篇文章主要介绍点阵字库放大算法（中文和英文），现在分享给大家，希望可以做个参考。

因摄像头高标清切换业务需求，需要切换不同大小的字体；

基本原理是把点阵字库的点进行扩展，放大两倍就是一个点变4个点；我这里用的基础字库是16x16的点阵，ASC是8x16的

Talk is cheap, show me the code. 话不多说，放码过来。

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//放大两倍,一个点变两个点，中英文是一样的
static void _OSD_FontZoom2(uint8_t font8,uint8_t *data)
{
int m=0,n=0;
uint8_t tmp[2];
uint32_t tmpd = 0;
memset(tmp,0,2);
for(m=0;m<8;m++)
{
if((font8>>m)&0x1)
{
tmpd |= 0x3 << (m*2);
}
else
{
tmpd |= 0x0 << (m*2);
}
}
tmp[0] = (tmpd >> 8)&0xff;
tmp[1] = tmpd&0xff;
memcpy(data,tmp,2);
}

复制代码

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//放大3倍
static void _OSD_FontZoom3(uint8_t font8,uint8_t *data)
{
int m=0,n=0;
uint8_t tmp[3];
uint32_t tmpd = 0;
memset(tmp,0,3);
for(m=0;m<8;m++)
{
if((font8>>m)&0x1)
{
tmpd |= 0x7 << (m*3);
}
else
{
tmpd |= 0x0 << (m*3);
}
}
tmp[0] = (tmpd >> 16)&0xff;
tmp[1] = (tmpd >> 8)&0xff;
tmp[2] = tmpd&0xff;
memcpy(data,tmp,3);
}

复制代码

// ASC放大2倍，入参font16为基础字库点阵数据
static void _OSD_Asc16ToAsc32(uint8_t *font16,uint8_t *font32)
{
uint8_t zoomout[32][2];
//8*16一行8位1字节，扩大为2字节，16列扩大为32列
uint8_t zoom[2];
int j=0,i=0;
for(;j<16;j++)
{
_OSD_FontZoom2(font16[j],zoom);
memcpy(zoomout[i],zoom ,2);
memcpy(zoomout[i+1],zoomout[i],2);
i += 2;
}
memcpy(font32,zoomout,64);
}
//汉字放大2倍
static void _OSD_HZ16ToHZ32(uint8_t *font16,uint8_t *font32)
{
uint8_t zoomout[32][4];
//16*16一行16位2字节，扩大为4字节，16列扩大为32列
uint8_t zoom[2];
int j=0,i=0,n=0;
for(;j<32;j++)
{
n = j%2;
_OSD_FontZoom2(font16[j],zoom);
memcpy(zoomout[i]+n*2,zoom ,2);
if(n != 0)
{
memcpy(zoomout[i+1],zoomout[i],4);
i += 2;
}
}
memcpy(font32,zoomout,128);
}
//汉字放大3倍
static void _OSD_HZ16ToHZ48(uint8_t *font16,uint8_t *font48)
{
uint8_t zoomout[48][6];
uint8_t zoom[3];
int j=0,i=0,n=0;
for(;j<32;j++)
{
_OSD_FontZoom3(font16[j],zoom);
n = j%2;
memcpy(zoomout[i]+n*3,zoom ,3);
if(n != 0)
{
memcpy(zoomout[i+1],zoomout[i],6);
memcpy(zoomout[i+2],zoomout[i],6);
i += 3;
}
}
memcpy(font48,zoomout,288);
}

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// ASC放大2倍，入参font16为基础字库点阵数据
static void _OSD_Asc16ToAsc32(uint8_t *font16,uint8_t *font32)
{
uint8_t zoomout[32][2];
//8*16一行8位1字节，扩大为2字节，16列扩大为32列
uint8_t zoom[2];
int j=0,i=0;
for(;j<16;j++)
{
_OSD_FontZoom2(font16[j],zoom);
memcpy(zoomout[i],zoom ,2);
memcpy(zoomout[i+1],zoomout[i],2);
i += 2;
}
memcpy(font32,zoomout,64);
}
//汉字放大2倍
static void _OSD_HZ16ToHZ32(uint8_t *font16,uint8_t *font32)
{
uint8_t zoomout[32][4];
//16*16一行16位2字节，扩大为4字节，16列扩大为32列
uint8_t zoom[2];
int j=0,i=0,n=0;
for(;j<32;j++)
{
n = j%2;
_OSD_FontZoom2(font16[j],zoom);
memcpy(zoomout[i]+n*2,zoom ,2);
if(n != 0)
{
memcpy(zoomout[i+1],zoomout[i],4);
i += 2;
}
}
memcpy(font32,zoomout,128);
}
//汉字放大3倍
static void _OSD_HZ16ToHZ48(uint8_t *font16,uint8_t *font48)
{
uint8_t zoomout[48][6];
uint8_t zoom[3];
int j=0,i=0,n=0;
for(;j<32;j++)
{
_OSD_FontZoom3(font16[j],zoom);
n = j%2;
memcpy(zoomout[i]+n*3,zoom ,3);
if(n != 0)
{
memcpy(zoomout[i+1],zoomout[i],6);
memcpy(zoomout[i+2],zoomout[i],6);
i += 3;
}
}
memcpy(font48,zoomout,288);
}