video.cpp

Quantum Platform(QP) is a family of very lightweight, state machine-based frameworks for embedded sy

//////////////////////////////////////////////////////////////////////////////
// Product: Direct Video (VGA) screen output
// Last Updated for Version: 3.3.00
// Date of the Last Update:  Jan 24, 2007
//
//                    Q u a n t u m     L e a P s
//                    ---------------------------
//                    innovating embedded systems
//
// Copyright (C) 2002-2007 Quantum Leaps, LLC. All rights reserved.
//
// This software may be distributed and modified under the terms of the GNU
// General Public License version 2 (GPL) as published by the Free Software
// Foundation and appearing in the file GPL.TXT included in the packaging of
// this file. Please note that GPL Section 2[b] requires that all works based
// on this software must also be made publicly available under the terms of
// the GPL ("Copyleft").
//
// Alternatively, this software may be distributed and modified under the
// terms of Quantum Leaps commercial licenses, which expressly supersede
// the GPL and are specifically designed for licensees interested in
// retaining the proprietary status of their code.
//
// Contact information:
// Quantum Leaps Web site:  http://www.quantum-leaps.com
// e-mail:                  [e-mail]
//////////////////////////////////////////////////////////////////////////////
#include "qf_port.h"
#include <conio.h>
#include <dos.h>

#include "video.h"

//............................................................................
void Video::clearScreen(uint8_t bgColor) {
    clrscr();
    clearRect(0,  0, 80, 25, bgColor);
}
//............................................................................
void Video::clearRect(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2,
                      uint8_t bgColor)
{
    for ( ; y1 < y2; ++y1) {
        uint8_t x;
        uint8_t far *pscr = (uint8_t far *)MK_FP(0xB800,
                                           (uint16_t)(((y1 * 80) + x1) * 2));
        for (x = x1; x < x2; ++x) {
            pscr[0] = ' ';                           // Put space in video RAM
            pscr[1] = bgColor;             // Put video attribute in video RAM
            pscr += 2;
        }
    }
}
//............................................................................
void Video::printStrAt(uint8_t x, uint8_t y, uint8_t color,
                       char const *str)
{
                                  // calculate position on the video RAM (VGA)
    uint8_t far *pscr = (uint8_t far *)MK_FP(0xB800,
                                             (uint16_t)(((y * 80) + x) * 2));
    while (*str != (char)0) {
        pscr[0] = *str++;                        // Put character in video RAM
        pscr[1] |= color;                  // Put video attribute in video RAM
        pscr += 2;
    }
}
//............................................................................
void Video::printNumAt(uint8_t x, uint8_t y, uint8_t color, uint32_t num) {
    char buf[4];
    buf[3] = (char)0;
    buf[2] = (char)('0' + num % 10);
    num /= 10;
    buf[1] = (char)('0' + num % 10);
    num /= 10;
    buf[0] = (char)('0' + num % 10);
    if (buf[0] == '0') {
        buf[0] = ' ';
    }
    printStrAt(x, y, color, buf);
}