source: tags/arb_5.1/WINDOW/aw_commn.hxx

#ifndef AW_COMMN_HXX
#define AW_COMMN_HXX

#define AW_INT(x) (  ((x)>=0) ? (int) ((x)+.5):(int )((x)-.5) )

class AW_GC_Xm {
public:
    GC                   gc;
    class AW_common     *common;
    XFontStruct          curfont;
    short                width_of_chars[256];
    short                ascent_of_chars[256];
    short                descent_of_chars[256];
    AW_font_information  fontinfo;
    short                line_width;
    AW_linestyle         style;
    short                color;
    unsigned long        last_fg_color;
    unsigned long        last_bg_color;

    short   fontsize;
    AW_font fontnr;

    AW_function function;
    AW_pos      grey_level;

    AW_GC_Xm(class AW_common *common);
    ~AW_GC_Xm();
    void set_fill(AW_grey_level grey_level); // <0 dont fill  0.0 white 1.0 black
    void set_font(AW_font font_nr, int size, int *found_size);
    void set_lineattributes(AW_pos width, AW_linestyle style);
    void set_function(AW_function function);
    void set_foreground_color(unsigned long color);
    void set_background_color(unsigned long color);

    int get_available_fontsizes(AW_font font_nr, int *available_sizes);
};


class AW_common {
public:
    AW_common(AW_window *aww, AW_area area, Display *display_in,
              XID window_id_in,unsigned long *fcolors,
              unsigned int **dcolors, long *data_colors_size);

    unsigned long  *frame_colors;
    unsigned long **data_colors;
    long           *data_colors_size;
    AW_root        *root;
    AW_rectangle    screen;
    int             screen_x_offset;
    int             screen_y_offset;
    AW_GC_Xm      **gcs;
    int             ngcs;
    Display        *display;
    XID             window_id;

    AW_pos x_alignment(AW_pos x_pos,AW_pos x_size,AW_pos alignment) { return x_pos- x_size*alignment; };
};


// #define AW_MAP_GC(gc) (aw_assert(gc<common->ngcs), common->gcs[gc])

inline bool AW_GC_MAPABLE(AW_common *common, int gc) {
    return gc<common->ngcs && common->gcs[gc] != 0;
}

inline AW_GC_Xm *AW_MAP_GC_tested(AW_common *common, int gc) {
    aw_assert(AW_GC_MAPABLE(common, gc));
    return common->gcs[gc];
}
#define AW_MAP_GC(gc) AW_MAP_GC_tested(common, gc)

#else
#error aw_commn.hxx included twice
#endif