#include "Bitmap.h"
#include <fstream>
#include <iostream>

Bitmap::Bitmap() {
    offset = 0;
    width = 0;
    height = 0;
    bpp = 0;
    data = nullptr;
}

Bitmap::~Bitmap() {
    if(data){
        delete data;
        data = nullptr;
    }
}

void Bitmap::load(const std::string &file) {
    std::ifstream stream(file);
    if(stream.is_open()){
        std::string str((std::istreambuf_iterator<char>(stream)),std::istreambuf_iterator<char>());
        data = new char[str.size()];
        for(int i = 0; i < str.size();i++){
            data[i] = str[i];
        }

        offset = *(unsigned int*)(data + 10);
        width = *(unsigned int*)(data + 18);
        height = *(unsigned int*)(data + 22);
        bpp = *(unsigned short*)(data + 28);
    }
}

int Bitmap::getWidth() {
    return width;
}

int Bitmap::getHeight() {
    return height;
}

char *Bitmap::getData() {
    return data + offset;
}

int Bitmap::getBitsPerPixel() {
    return bpp;
}

char *Bitmap::getPixel(int x, int y) {
    return getData() + ((getHeight() - y) * getWidth() + x) * getBitsPerPixel() / 8;
}