获得位图之点阵

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最新推荐文章于 2024-10-29 10:36:58 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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本文介绍了如何通过8x16数组形式获取字符的点阵信息，点阵索引基于ASCII码与16的乘积，超过0x80的值不再属于ASCII范围。

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点阵是由8x16数组构成，字符的点阵是由字符的asci码X16来索引其对应的点阵，所以大于0x80就不是asiic

#include <config.h>
#include <fonts_manager.h>

#define FONTDATAMAX 4096

static int ASCIIFontInit(char *pcFontFile, unsigned int dwFontSize);
static int ASCIIGetFontBitmap(unsigned int dwCode, PT_FontBitMap ptFontBitMap);

static T_FontOpr g_tASCIIFontOpr = {
	.name          = "ascii",
	.FontInit      = ASCIIFontInit,
	.GetFontBitmap = ASCIIGetFontBitmap,
};
static int ASCIIFontInit(char *pcFontFile, unsigned int dwFontSize)
{
	if (dwFontSize != 16)
	{
		//DBG_PRINTF("ASCII can't support %d font size\n", dwFontSize);
		return -1;
	}
	return 0;
}

static int ASCIIGetFontBitmap(unsigned int dwCode, PT_FontBitMap ptFontBitMap)
{
	int iPenX = ptFontBitMap->iCurOriginX;
	int iPenY = ptFontBitMap->iCurOriginY;
	
	if (dwCode > (unsigned int)0x80)
	{
		//DBG_PRINTF("don't support this code : 0x%x\n", dwCode);
		return -1;
	}
	//由卡尔坐标转换为lcd坐标，笛卡尔原点在左下角，lcd原点在左上角
	ptFontBitMap->iXLeft    = iPenX;
	ptFontBitMap->iYTop     = iPenY - 16;
	ptFontBitMap->iXMax     = iPenX + 8;
	ptFontBitMap->iYMax     = iPenY;
	ptFontBitMap->iBpp      = 1;
	ptFontBitMap->iPitch    = 1;

	//有索引找到对应的点阵
	ptFontBitMap->pucBuffer = (unsigned char *)&fontdata_8x16[dwCode * 16];;	
	//Y不变，x增加
	ptFontBitMap->iNextOriginX = iPenX + 8;
	ptFontBitMap->iNextOriginY = iPenY;
	
	return 0;
}

int ASCIIInit(void)
{
	return RegisterFontOpr(&g_tASCIIFontOpr);//添加到链表
}