textmode.cpp

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#include <drivers/console/textmode.h>
 
using namespace MaxOS;
using namespace MaxOS::common;
using namespace MaxOS::drivers;
using namespace MaxOS::drivers::console;
 
TextModeConsole::TextModeConsole() = default;
 
TextModeConsole::~TextModeConsole() = default;
 
uint16_t TextModeConsole::width() {
    return 80;
}
 
uint16_t TextModeConsole::height() {
    return 25;
}
 
void TextModeConsole::put_character(uint16_t x, uint16_t y, char c) {
 
    // Check bounds
    if (x >= width() || y >= height())
        return;
 
    // Calculate the offset
    int offset = (y * width() + x);
 
    // Set the character at the offset, mask away the colour information
    m_video_memory[offset] = (m_video_memory[offset] & 0xFF00) | (uint16_t) c;
}
 
void TextModeConsole::set_foreground_color(uint16_t x, uint16_t y, ConsoleColour foreground) {
 
    // Check bounds
    if (x >= width() || y >= height())
        return;
 
    // Calculate the offset
    int offset = (y * width() + x);
 
    // Set the foreground color at the offset, mask to get the foreground bits
    m_video_memory[offset] = (m_video_memory[offset] & 0xF0FF) | ((uint16_t) foreground << 8);
}
 
void TextModeConsole::set_background_color(uint16_t x, uint16_t y, ConsoleColour background) {
 
    // Check bounds
    if (x >= width() || y >= height())
        return;
 
    // Calculate the offset
    int offset = (y * width() + x);
 
    // Set the background color at the offset, mask to get the backgroun bits
    m_video_memory[offset] = (m_video_memory[offset] & 0x0FFF) | ((uint16_t) background << 12);
}
 
char TextModeConsole::get_character(uint16_t x, uint16_t y) {
 
    // Check bounds
    if (x >= width() || y >= height())
        return ' ';
 
    // Calculate the offset
    int offset = (y * width() + x);
 
    // Return the character at the offset, mask away the colour information
    return (char) (m_video_memory[offset] & 0x00FF);
}
 
ConsoleColour TextModeConsole::get_foreground_color(uint16_t x, uint16_t y) {
 
    // Check bounds
    if (x >= width() || y >= height())
        return ConsoleColour::White;
 
    // Calculate the offset
    int offset = (y * width() + x);
 
    // Return the foreground color at the offset, by masking the foreground color with the current foreground color (bits 8-11)
    return (ConsoleColour) ((m_video_memory[offset] & 0x0F00) >> 8);
}
 
ConsoleColour TextModeConsole::get_background_color(uint16_t x, uint16_t y) {
 
    // Check bounds
    if (x >= width() || y >= height())
        return ConsoleColour::Black;
 
    // Calculate the offset
    int offset = (y * width() + x);
 
    // Return the background color at the offset, by masking the background color with the current background color (bits 12-15)
    return (ConsoleColour) ((m_video_memory[offset] & 0xF000) >> 12);
}