Screen.h

/*
 This file is part of Pi-XPlane-FMC-CDU
 A Raspberry Pi-based External FMC for XPlane

 Copyright (C) 2017-2018 shahada abubakar
 <shahada@abubakar.net>

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <https://www.gnu.org/licenses/>.

 */

#ifndef PIXPLANEFMCCDU_SRC_SCREEN_H_
#define PIXPLANEFMCCDU_SRC_SCREEN_H_

#include <iostream>
#include <syslog.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>
#include <list>
#include <mutex>


class Screen {
private:
    // private so it cannot be called publicly
    Screen();

    // private so it cannot be called publicly
    Screen(Screen const &) {
    }

    // assignment operator is private
    Screen & operator=(Screen const &) {
        abort();
    }

protected:
    static Screen * instance;

    bool isRunning = false;
    bool stopRequested = false;

    SDL_Window* window = NULL;

    SDL_Renderer * renderer = NULL;

    int numCols = 0;

    int numRows = 14;

    int cellWidth = 0;

    int tallCellHeight = 0;

    int shortCellHeight = 0;

    int winLeftBorder = 0;

    int winTopBorder = 0;

    int shortCharVertOffset = 0;

    int linePos[15];

    SDL_Texture * tallChars = NULL;

    SDL_Texture * shortChars = NULL;

    SDL_Texture * screenBufferTexture = NULL;

    Uint32 screenRefreshTimerMs = 10;

    Uint32 interPollDelayMs = 1;

    Uint32 SDLUserEventBase;

    enum ScreenEventType
        : int {
            init = 0, LineUpdate = 1, clear = 2, quit = 4
    };

    class ScreenEvent {
    public:
        int col; // used by init and drawLine
        int line;   // used by drawLine
        std::string text; // used by drawLine
        bool spaceErases; // space erases if true, skips if false
        char color; // G=Green
        bool smallInBig; // small font in Large line
    };

    bool isx737FMCLegsPage = false;

    virtual ~Screen();


    void doInit(SDL_Event * event);

    void doClear();

    void doDrawLine(SDL_Event * event);

    void transferBufferToDisplay ();

    SDL_Texture * generateCharacterTexture (std::string fontPath, int cellWidth, int maxHeight, SDL_Renderer * renderer);


    TTF_Font * getFont (std::string fontPath, int maxWidth ,int maxHeight, SDL_Renderer * renderer);



    // == old stuff ==
    /*
    void calculateDimensions(int numCols, bool drawGrid = false);