cgascr.h.svn-base

德国Erlangen大学教学操作系统源码。

#ifndef __screen_include__
#define __screen_include__

/*****************************************************************************/
/* Betriebssysteme                                                           */
/*---------------------------------------------------------------------------*/
/*                                                                           */
/*                             C G A _ S C R E E N                           */
/*                                                                           */
/*---------------------------------------------------------------------------*/
/* Mit Hilfe dieser Klasse kann man auf den Bildschirm des PCs zugreifen.    */
/* Der Zugriff erfolgt direkt auf der Hardwareebene, d.h. ueber den Bild-    */
/* schirmspeicher bzw. die I/O-Ports der Grafikkarte.                        */
/*****************************************************************************/

#include "machine/io_port.h"


class CGA_Screen
{
public:
	struct CGA_Attrib
	{
		enum
		{
			screen_width = 80, screen_height = 24,

			fg_black = 0x0,    fg_blue = 0x1,        fg_green = 0x2,     fg_cyan = 0x3,
			fg_red = 0x4,      fg_magenta = 0x5,     fg_bown = 0x6,      fg_hellgray = 0x7,
			fg_darkgray = 0x8, fg_hellblue = 0x9,    fg_hellgreen = 0xa, fg_hellcyan = 0xb,
			fg_hellred = 0xc,  fg_hellmagenta = 0xd, fg_yellow = 0xe,    fg_white = 0xf,

			bg_black = 0x00,   bg_blue = 0x10,       bg_green = 0x20,    bg_cyan = 0x30,
			bg_red = 0x40,     bg_magenta = 0x50,    bg_bown = 0x60,     bg_hellgray = 0x70,

			noblink = 0x0,     blink = 0x80
		};
	};
	
	CGA_Screen();
	CGA_Screen(CGA_Screen &scr);
	virtual ~CGA_Screen();
	
	void show (int x, int y, char c, unsigned char attrib);
	void setpos (int x, int y);
	void getpos (int &x, int &y);
	void print (char* text, int length, unsigned char attrib);
	void print (char c, unsigned char attrib);
	void println ();
	
	void clear();
	void scroll(int line);
	int offset(int x, int y) const;
	void incpos();
	void decpos();
	
	void goto_head();
	void goto_end();
	void set_fg_color(int color);
	void set_bg_color(int color);
	void set_blink(bool on);
	void set_color(int color);
	
	int get_fg_color();
	int get_bg_color();
	bool is_blink();
	int get_color();
	
protected:
	
	char *m_screen;
	IO_Port m_index;
	IO_Port m_data;
	int m_curX;
	int m_curY;
	unsigned int m_color;
};

#endif