sdlterm/src/sdlterm.h
author Radek Brich <radek.brich@devl.cz>
Wed, 09 Jan 2013 22:32:15 +0100
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child 61 15088f62c4ac
permissions -rw-r--r--
DriverSDL: Implement blink attribute.
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#include "SDL.h"
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#include "SDL_ttf.h"
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#include <map>
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#include <string>
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#include <vector>
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#include <exception>
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namespace Style
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{
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    enum {
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        BOLD      = 1 << 24,  // bold font
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        UNDERLINE = 1 << 25,  // underline text
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        STANDOUT  = 1 << 26,  // inverse bg/fg
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        BLINK     = 1 << 27,  // blinking
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    };
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};
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class ColorMap
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{
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private:
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    Uint8 _map[16][3] = {
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        {0,0,0},        // 0 - black
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        {23,23,178},    // 1 - blue
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        {23,178,23},    // 2 - green
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        {23,178,178},   // 3 - cyan
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        {178,23,23},    // 4 - red
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        {178,23,178},   // 5 - magenta
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        {178,103,23},   // 6 - brown
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        {178,178,178},  // 7 - light gray
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        {104,104,104},  // 8 - gray
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        {84,84,255},    // 9 - light blue
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        {84,255,84},    // 10 - light green
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        {84,255,255},   // 11 - light cyan
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        {255,84,84},    // 12 - light red
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        {255,84,255},   // 13 - light magenta
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        {255,255,84},   // 14 - yellow
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        {255,255,255},  // 15 - white
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    };
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public:
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    void index_to_rgb(int index, SDL_Color &color) const;
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};
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class GlyphCache
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{
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public:
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    // lookup glyph in cache, id is combined char and attr
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    SDL_Surface *lookup_glyph(Uint64 id);
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    void put_glyph(Uint64 id, SDL_Surface *srf);
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    void flush();
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private:
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    std::map<Uint64, SDL_Surface*> _glyph_map;
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};
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/* TTF font glyph renderer
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 *
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 * Renders uniformly sized cells with single character.
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 * Wraps SDL_ttf functions, see its documentation here:
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 *
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 * http://www.libsdl.org/projects/SDL_ttf/docs/SDL_ttf.html
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 *
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 */
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class GlyphRenderer
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{
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public:
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    GlyphRenderer();
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    ~GlyphRenderer();
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    void open_font(const char *fname_regular, const char *fname_bold, int ptsize);
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    void close_font();
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    // do not free surface returned!
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    SDL_Surface *render_cell(Uint32 ch, Uint32 attr, bool blink_state);
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    int get_cell_width() const { return _cell_width; };
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    int get_cell_height() const { return _cell_height; };
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private:
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    TTF_Font *_font_regular;
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    TTF_Font *_font_bold;
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    int _cell_width;
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    int _cell_height;
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    GlyphCache _cache;
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    ColorMap _colormap;
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    void _render_glyph(SDL_Surface *cell_surface, TTF_Font *font, Uint32 ch,
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            SDL_Color fgcolor, SDL_Color bgcolor);
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};
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/* One cell of terminal window
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 *
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 * Each cell contains one character, its color and attributes.
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 * Character is encoded in 32bit unicode.
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 * Other 32 bits are attributes:
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 *   0-7   (8b) - foreground color index
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 *   8-15  (8b) - background color index
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 *   16-23 (8b) - RESERVED for alpha channel
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 *   24    (1b) - bold font
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 *   25    (1b) - underline
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 *   26    (1b) - standout (swap fg/bg color)
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 *   27    (1b) - blink
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 *   28-31 (4b) - RESERVED
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 */
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struct TerminalCell
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{
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    Uint32 ch;
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    Uint32 attr;
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    TerminalCell() : ch(0), attr(7) {};
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    bool operator !=(const TerminalCell &rhs) const { return ch != rhs.ch || attr != rhs.attr; };
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};
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class TerminalScreen
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{
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public:
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    TerminalScreen():
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        _screen_surface(NULL), _cells_front(0), _cells_back(0), _render(),
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        _pixel_width(0), _pixel_height(0), _width(0), _height(0),
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        _cell_width(0), _cell_height(0), _blink_state(1) {};
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    ~TerminalScreen() {};
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    void select_font(const char *fname_regular, const char *fname_bold, int ptsize);
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    void resize(int pxwidth, int pxheight);
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    void erase();
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    void putch(int x, int y, Uint32 ch, Uint32 attr);
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    void toggle_cursor(int x, int y);
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    void toggle_blink() { _blink_state = !_blink_state; _draw_blink(); };
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    void commit();
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    // force full redraw on next commit()
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    void redraw();
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    int get_width() const { return _width; };
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    int get_height() const { return _height; };
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    int get_cell_width() const { return _cell_width; };
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    int get_cell_height() const { return _cell_height; };
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private:
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    SDL_Surface *_screen_surface;
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    std::vector<TerminalCell> _cells_front;
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    std::vector<TerminalCell> _cells_back;
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    GlyphRenderer _render;
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    int _pixel_width;  // terminal window width in pixels
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    int _pixel_height;
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    int _width;  // width in characters
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    int _height; // height in characters
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    int _cell_width;  // character cell width in pixels
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    int _cell_height;
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    int _blink_state; // 0 - blink chars hidden, 1 - visible
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    void _reset_cells();
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    void _draw_blink();
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};
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struct Event
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{
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    enum { QUIT, RESIZE, KEYPRESS, MOUSEDOWN, MOUSEUP, MOUSEMOVE, MOUSEWHEEL };
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    int type;
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    union
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    {
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        struct
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        {
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            char keyname[10];
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            Uint32 unicode;
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        } key;
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        struct
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        {
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            int x, y;
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            int button;
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        } mouse;
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    };
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};
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class Terminal
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{
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public:
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    Terminal();
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    ~Terminal();
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    void select_font(const char *fname_regular, const char *fname_bold, int ptsize)
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        { _screen.select_font(fname_regular, fname_bold, ptsize); };
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    void resize(int pxwidth, int pxheight) { _screen.resize(pxwidth, pxheight); };
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    void erase() { _screen.erase(); };
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    void putch(int x, int y, Uint32 ch) { _screen.putch(x, y, ch, _attr); };
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    void commit();
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    Uint32 prepare_attr(Uint8 fg, Uint8 bg, Uint8 style) { return (Uint32)fg | (Uint32)bg << 8 | (Uint32)style << 24; };
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    void set_attr(Uint32 value) { _attr = value; };
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    void show_cursor(int x, int y) { _cursor_x = x; _cursor_y = y; _cursor_visible = true; };
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    void hide_cursor() { _cursor_visible = false; };
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    /* Wait for an event.
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     *
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     * Timeout is in miliseconds, zero means wait indefinitely.
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     * Returns false on timeout, true on event.
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     */
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    bool wait_event(Event &event, Uint32 timeout);
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    int get_width() const { return _screen.get_width(); };
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    int get_height() const { return _screen.get_height(); };
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private:
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    TerminalScreen _screen;
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    Uint32 _attr;
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    int _cursor_x;
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    int _cursor_y;
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    bool _cursor_visible;
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    int _mousemove_last_x;
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    int _mousemove_last_y;
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    const char *_translate_keyname(SDLKey sym);
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    static Uint32 _wait_event_callback(Uint32 interval, void *param);
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    static Uint32 _blink_toggle_callback(Uint32 interval, void *param);
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};
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class SDLTermError: public std::exception
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{
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public:
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    SDLTermError(const std::string &a_msg)
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        : std::exception(), _msg(a_msg) {};
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    virtual ~SDLTermError() throw() {};
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    virtual const char *what() const throw() { return _msg.c_str(); };
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private:
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    std::string _msg;
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};
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