获得位图之GBK

最新推荐文章于 2023-06-23 11:10:42 发布

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最新推荐文章于 2023-06-23 11:10:42 发布

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分类专栏：韦东山老师项目学习笔记

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国标是的位码以0xA1为开始，区码也是以0XA1为开始。是16X16的点阵，根据位码-0XA1和区码-0XA1为索引

#include <config.h>
#include <fonts_manager.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>


static int GBKFontInit(char *pcFontFile, unsigned int dwFontSize);
static int GBKGetFontBitmap(unsigned int dwCode, PT_FontBitMap ptFontBitMap);

static T_FontOpr g_tGBKFontOpr = {
	.name          = "gbk",
	.FontInit      = GBKFontInit,
	.GetFontBitmap = GBKGetFontBitmap,
};

static int g_iFdHZK;
static unsigned char *g_pucHZKMem;
static unsigned char *g_pucHZKMemEnd;

static int GBKFontInit(char *pcFontFile, unsigned int dwFontSize)
{
	struct stat tStat;

	if (16 != dwFontSize)
	{
		DBG_PRINTF("GBK can't support %d fontsize\n", dwFontSize);
		return -1;
	}
	
	g_iFdHZK = open(pcFontFile, O_RDONLY);//打开字体文件
	if (g_iFdHZK < 0)
	{
		DBG_PRINTF("can't open %s\n", pcFontFile);
		return -1;
	}
	if(fstat(g_iFdHZK, &tStat))//获得文件的属性
	{
		DBG_PRINTF("can't get fstat\n");
		return -1;
	}
	g_pucHZKMem = (unsigned char *)mmap(NULL , tStat.st_size, PROT_READ, MAP_SHARED, g_iFdHZK, 0);//映射到内存
	if (g_pucHZKMem == (unsigned char *)-1)
	{
		DBG_PRINTF("can't mmap for hzk16\n");
		return -1;
	}
	g_pucHZKMemEnd = g_pucHZKMem + tStat.st_size;//结束地址
	return 0;
}

static int GBKGetFontBitmap(unsigned int dwCode, PT_FontBitMap ptFontBitMap)
{
	int iArea;
	int iWhere;

	int iPenX = ptFontBitMap->iCurOriginX;
	int iPenY = ptFontBitMap->iCurOriginY;

	DBG_PRINTF("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);

	if (dwCode & 0xffff0000)
	{
		DBG_PRINTF("don't support this code : 0x%x\n", dwCode);
		return -1;
	}	

	iArea  = (int)(dwCode & 0xff) - 0xA1;//获得区吗索引
	iWhere = (int)((dwCode >> 8) & 0xff) - 0xA1;//获得位码索引

	if ((iArea < 0) || (iWhere < 0))
	{
		DBG_PRINTF("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
		return -1;
	}
	//坐标转化，把笛卡尔坐标（原点右下脚）转化为LCD坐标（原点左下角），
	ptFontBitMap->iXLeft    = iPenX;
	ptFontBitMap->iYTop     = iPenY - 16;
	ptFontBitMap->iXMax     = iPenX + 16;
	ptFontBitMap->iYMax     = iPenY;
	ptFontBitMap->iBpp      = 1;
	ptFontBitMap->iPitch    = 2;
	ptFontBitMap->pucBuffer = g_pucHZKMem + (iArea * 94 + iWhere)*32;//获得字体点阵	

	if (ptFontBitMap->pucBuffer >= g_pucHZKMemEnd)
	{
		return -1;
	}

	ptFontBitMap->iNextOriginX = iPenX + 16;
	ptFontBitMap->iNextOriginY = iPenY;
	
	DBG_PRINTF("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
	return 0;
}

int GBKInit(void)
{
	return RegisterFontOpr(&g_tGBKFontOpr);//加入链表
}