10.绘制ascii字体/鼠标指针_怎么制作ascill英文标准字体-优快云博客

本文链接：https://blog.youkuaiyun.com/Zllvincent/article/details/83870017

这篇博客介绍了如何使用ASCII字符绘制字体和鼠标指针。首先，通过在8*16的区域内设定特定像素点的颜色来形成字体。接着，展示了如何实现ASCII字体的绘制，并在OS.c文件中进行修改以加载虚拟软盘文件，成功完成字符字体的绘制。此外，还解释了鼠标指针的绘制原理，其点阵为16x16，同样通过修改OS.c文件实现。最后，提醒在制作虚拟软盘时要注意不要超过内核启动器读取的扇区数量。

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简介

上一节我们使用调色板绘制了基本的桌面背景，对图形的绘制有一定的了解。字体的绘制跟其他图形一样，都是通过将指定位置的像素点设置成给定颜色而形成的最终图形。
我们看到，要绘制给定的字母，我们可以把一块图形区域先全部染成白色，然后在将某个位置的像素点的颜色设置成黑色，那么，字体就显示出来了。如果我们把字体的大小限定在一个8*16的长方形区域，那么我们在这个区域内，将特定位置的像素点设置成黑色，其他点设置成白色，那么我们就可以得到一个白底黑色的字体：
在这里插入图片描述

目标

实现字形图形的绘制鼠标指针的绘制。ascii 字符点阵编码ascii_font.h文件如下:

//ascii 8x16点阵编码。每一行一个字节，共16行，为1表示显示
//每个字符的显示需要16个字节
//编码的都是可显示字符从ascii编码0x20-0x7f
//

static unsigned char ascii_array[] = {
				
		// space 0x20
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		// !
		0x00,0x00,0x18,0x3C,0x3C,0x3C,0x18,0x18,0x18,0x00,0x18,0x18,0x00,0x00,0x00,0x00,
		// "
		0x00,0x63,0x63,0x63,0x22,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 
		// #
		0x00,0x00,0x00,0x36,0x36,0x7F,0x36,0x36,0x36,0x7F,0x36,0x36,0x00,0x00,0x00,0x00, 
		// $
		0x0C,0x0C,0x3E,0x63,0x61,0x60,0x3E,0x03,0x03,0x43,0x63,0x3E,0x0C,0x0C,0x00,0x00, 
		// %
		0x00,0x00,0x00,0x00,0x00,0x61,0x63,0x06,0x0C,0x18,0x33,0x63,0x00,0x00,0x00,0x00,
		// & 
		0x00,0x00,0x00,0x1C,0x36,0x36,0x1C,0x3B,0x6E,0x66,0x66,0x3B,0x00,0x00,0x00,0x00, 
		// '
		0x00,0x30,0x30,0x30,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		// (
		0x00,0x00,0x0C,0x18,0x18,0x30,0x30,0x30,0x30,0x18,0x18,0x0C,0x00,0x00,0x00,0x00, 
		// )
		0x00,0x00,0x18,0x0C,0x0C,0x06,0x06,0x06,0x06,0x0C,0x0C,0x18,0x00,0x00,0x00,0x00, 
		// *
		0x00,0x00,0x00,0x00,0x42,0x66,0x3C,0xFF,0x3C,0x66,0x42,0x00,0x00,0x00,0x00,0x00,
		// +
		0x00,0x00,0x00,0x00,0x18,0x18,0x18,0xFF,0x18,0x18,0x18,0x00,0x00,0x00,0x00,0x00, 
		// ,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x18,0x30,0x00,0x00, 
		// -
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 
		// .
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x00,0x00,0x00,0x00, 
		// / (forward slash)
		0x00,0x00,0x01,0x03,0x07,0x0E,0x1C,0x38,0x70,0xE0,0xC0,0x80,0x00,0x00,0x00,0x00, 
		// 0 0x30
		0x00,0x00,0x3E,0x63,0x63,0x63,0x6B,0x6B,0x63,0x63,0x63,0x3E,0x00,0x00,0x00,0x00,
		// 1
		0x00,0x00,0x0C,0x1C,0x3C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x3F,0x00,0x00,0x00,0x00, 
		// 2
		0x00,0x00,0x3E,0x63,0x03,0x06,0x0C,0x18,0x30,0x61,0x63,0x7F,0x00,0x00,0x00,0x00, 
		// 3
		0x00,0x00,0x3E,0x63,0x03,0x03,0x1E,0x03,0x03,0x03,0x63,0x3E,0x00,0x00,0x00,0x00, 
		// 4
		0x00,0x00,0x06,0x0E,0x1E,0x36,0x66,0x66,0x7F,0x06,0x06,0x0F,0x00,0x00,0x00,0x00, 
		// 5
		0x00,0x00,0x7F,0x60,0x60,0x60,0x7E,0x03,0x03,0x63,0x73,0x3E,0x00,0x00,0x00,0x00, 
		// 6
		0x00,0x00,0x1C,0x30,0x60,0x60,0x7E,0x63,0x63,0x63,0x63,0x3E,0x00,0x00,0x00,0x00, 
		// 7
		0x00,0x00,0x7F,0x63,0x03,0x06,0x06,0x0C,0x0C,0x18,0x18,0x18,0x00,0x00,0x00,0x00, 
		// 8
		0x00,0x00,0x3E,0x63,0x63,0x63,0x3E,0x63,0x63,0x63,0x63,0x3E,0x00,0x00,0x00,0x00, 
		// 9
		0x00,0x00,0x3E,0x63,0x63,0x63,0x63,0x3F,0x03,0x03,0x06,0x3C,0x00,0x00,0x00,0x00, 
		// :
		0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x00,0x00,0x00,0x18,0x18,0x00,0x00,0x00,0x00, 
		 // ;
		0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x00,0x00,0x00,0x18,0x18,0x18,0x30,0x00,0x00,
		// <
		0x00,0x00,0x00,0x06,0x0C,0x18,0x30,0x60,0x30,0x18,0x0C,0x06,0x00,0x00,0x00,0x00,
		// =
		0x00,0x00,0x00,0x00,0x00,0x00,0x7E,0x00,0x00,0x7E,0x00,0x00,0x00,0x00,0x00,0x00, 
		// >
		0x00,0x00,0x00,0x60,0x30,0x18,0x0C,0x06,0x0C,0x18,0x30,0x60,0x00,0x00,0x00,0x00, 
		// ?
		0x00,0x00,0x3E,0x63,0x63,0x06,0x0C,0x0C,0x0C,0x00,0x0C,0x0C,0x00,0x00,0x00,0x00, 
		// @ 0x40
		0x00,0x00,0x3E,0x63,0x63,0x6F,0x6B,0x6B,0x6E,0x60,0x60,0x3E,0x00,0x00,0x00,0x00, 
		// A
		0x00,0x00,0x08,0x1C,0x36,0x63,0x63,0x63,0x7F,0x63,0x63,0x63,0x00,0x00,0x00,0x00,
		// B
		0x00,0x00,0x7E,0x33,0x33,0x33,0x3E,0x33,0x33,0x33,0x33,0x7E,0x00,0x00,0x00,0x00, 
		// C
		0x00,0x00,0x1E,0x33,0x61,0x60,0x60,0x60,0x60,0x61,0x