PiegOS/kernel/Helpers/memPrint.cpp

#include "./memPrint.hpp"



//Constructor
memPrint::memPrint(){

    //Initialise position
    this->m_cursorX=0;
    this->m_cursorY=0;

    //Initialise color
    this->setBackground(BLACK);
    this->setForeground(WHITE);

}

//Destructor
memPrint::~memPrint(){

}


//Move cursor
void memPrint::updateCursor(){


    //Update X axis
    this->m_cursorX++;

    //Check X value
    if(this->m_cursorX >= MAXCURSORX){

        //If X is out of the screen
        this->m_cursorX=0;

        //Update Y
        this->m_cursorY++;

        //Check Y value
        if(this->m_cursorY >= MAXCURSORY){

            //If Y is out of the screen
            this->scrollUp(1);

            //Decrease Y value
            this->m_cursorY--;
        }


    }


}

//Change character background color
void memPrint::setBackground(colorBios color){
    u8 newColor= (color << 4);
    this->m_colors= newColor | ((this->m_colors << 4) >> 4);
}

//Change character color
void memPrint::setForeground(colorBios color){
    u8 newColor= color;
    this->m_colors= newColor | ((this->m_colors >> 4) << 4);
}

//Print a char
void memPrint::putChar(u8 character){

    //Get the adresse with the cursor position
    char *adress= ((char *) MEMPRINTSTARTADR) + (this->m_cursorX * 2) + (this->m_cursorY * MAXCURSORX * 2);

    //Copy the character
    *adress=character;

    //Copy his attribute
    adress++;
    *adress=this->m_colors;

    //Update cursor position
    this->updateCursor();

}


//Print a char*
void memPrint::print(char *str){
    while(*str!=0x0){
        this->putChar(*str);
        str++;
    }
}

//Clear the screen
void memPrint::clear(){
    this->scrollUp(MAXCURSORY);
}

//Scroll up "number" times
void memPrint::scrollUp(u8 number){

    //Get number of adress (char & his attribute) to scroll
    int nbAdrToScroll=number*MAXCURSORX*2;


    //Scroll all of the characters and attributes
    for(int i=0;i!=MAXCURSORX*2*MAXCURSORY;i++){

        //Get source character or attribute
        char* source=(((char *)MEMPRINTSTARTADR) + i);

        //Get destination character or attribute
        char* dest=source-nbAdrToScroll;

        //Check if destination is out of the screen
        if(dest >= (char *)MEMPRINTSTARTADR)
            *dest=*source;

        //Remove data from source
        *source=0x0;

    }

}