class SCREEN,CPP

#define UCHAR unsigned char
#define VIDEO_INT 0x16

class Screen
{
private:
    UCHAR mode, row, col;
    UCHAR rownum, colnum;
    UCHAR active_page, visual_page;
    UCHAR attribute;

public:
    Screen(void);        // Konstruktor default
    Screen(UCHAR mode);
    ~Screen(void);      // Desktruktor default

    void setMode(UCHAR mode);
    UCHAR getMode(void);

    void setCursorPos(UCHAR y, UCHAR x);
    void getCursorPos(UCHAR *y, UCHAR *x);

    void writeChar(UCHAR letter);
    void writeString(UCHAR *str);

    void setAttribute(UCHAR attr);
    UCHAR getCharAttr(UCHAR *attr);

    void setActivePage(UCHAR page);
    UCHAR getActivePage(void);

    void setVisualPage(UCHAR page);
    UCHAR getVisualPage(void);

    void cls(void);
};

Screen::Screen(void)
{
UCHAR mode;

this->row = 0;
this->col = 0;

this->mode = mode = 0x03;

this->rownum = 25;
this->colnum = 80;

this->active_page = 0;
this->visual_page = 0;

this->attribute = 7;

asm mov ah, 0x00;
asm mov al, mode;
asm or al, 0x80;
asm int VIDEO_INT;

return;
}

Screen::Screen(UCHAR mode)
{
this->setMode(mode);

return;
}

Screen::~Screen(void)
{
return;
}

void Screen::setMode(UCHAR mode)
{
this->mode = mode;

this->active_page = 0;
this->visual_page = 0;

this->rownum = 25;

switch (mode)
{
    case 0x00 :
    case 0x01 : this->colnum = 40;
                                                break;
    case 0x02 :
    case 0x03 :
    case 0x07 : this->colnum = 80;
                                                break;

    default   : this->colnum = 0;
                                                break;
}

asm mov ah, 0x00;
asm mov al, mode;
asm or al, 0x80;
asm int VIDEO_INT;

return;
}

UCHAR Screen::getMode(void)
{
return this->mode;
}

void Screen::setCursorPos(UCHAR y, UCHAR x)
{
UCHAR page = this->active_page;

if ((y > this->rownum) || (x > this->colnum))
    y = x = 0;

this->row = y;
this->col = x;

asm mov ah, 0x02;
asm mov bh, page;
asm mov dh, y;
asm mov dl, x;
asm int VIDEO_INT;

return;
}

void Screen::getCursorPos(UCHAR *y, UCHAR *x)
{
*y = this->row;
*x = this->col;

return;
}

void Screen::writeChar(UCHAR letter)
{
UCHAR page = this->active_page;
UCHAR attr = this->attribute;

asm mov ah, 0x09;
asm mov al, letter;
asm mov bh, page;
asm mov bl, attr;
asm mov ch, 0x00;
asm mov cl, 0x01;
asm int VIDEO_INT;

return;
}

void Screen::writeString(UCHAR *str)
{
for (; *str != '\0'; str++)
{
    if (this->col > this->colnum)
    {
      this->row++;
      this->col = 0;
    }

    this->setCursorPos(this->row, this->col);
    this->writeChar(*str);
    this->col++;
}

return;
}

void Screen::setAttribute(UCHAR attr)
{
this->attribute = attr;

return;
}

UCHAR Screen::getCharAttr(UCHAR *attr)
{
UCHAR page = this->active_page;
UCHAR letter, attribute;

asm mov ah, 0x08;
asm mov bh, page;
asm int VIDEO_INT;
asm mov attribute, ah;
asm mov letter, al;

this->attribute = *attr = attribute;

return letter;
}

void Screen::setActivePage(UCHAR page)
{
this->active_page = page;

return;
}

UCHAR Screen::getActivePage(void)
{
return this->active_page;
}

void Screen::setVisualPage(UCHAR page)
{
if (page > 7) page = 0;

this->visual_page = page;

asm mov ah, 0x05;
asm mov al, page;
asm int VIDEO_INT;

return;
}

UCHAR Screen::getVisualPage(void)
{
return this->visual_page;
}

void Screen::cls(void)
{
UCHAR mode = this->mode;

this->row = 0;
this->col = 0;

asm mov ah, 0x00;
asm mov al, mode;
asm int VIDEO_INT;

return;
}

class SCREEN,CPP

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