font.h

/*************************************************************************/
/*  font.h                                                               */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
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/*************************************************************************/
#ifndef FONT_H
#define FONT_H

#include "resource.h"
#include "scene/resources/texture.h"
#include "map.h"
class Font : public Resource {

    OBJ_TYPE( Font, Resource );
    RES_BASE_EXTENSION("fnt");

    Vector< Ref<Texture> > textures;

public:
    struct Character {

        int texture_idx;
        Rect2 rect;
        float v_align;
        float h_align;
        float advance;

        Character() { texture_idx=0; v_align=0; }
    };

    struct KerningPairKey {

        union {
            struct {
                uint32_t A,B;
            };

            uint64_t pair;
        };

        _FORCE_INLINE_ bool operator<(const KerningPairKey& p_r) const { return pair<p_r.pair; }
    };

private:


    HashMap< CharType, Character > char_map;
    Map<KerningPairKey,int> kerning_map;

    float height;
    float ascent;
    bool distance_field_hint;

    void _set_chars(const DVector<int>& p_chars);
    DVector<int> _get_chars() const;
    void _set_kernings(const DVector<int>& p_kernings);
    DVector<int> _get_kernings() const;
    void _set_textures(const Vector<Variant> & p_textures);
    Vector<Variant> _get_textures() const;

    Ref<Font> fallback;
protected:

    static void _bind_methods();

public:

    Error create_from_fnt(const String& p_file);

    void set_height(float p_height);
    float get_height() const;

    void set_ascent(float p_ascent);
    float get_ascent() const;
    float get_descent() const;

    void add_texture(const Ref<Texture>& p_texture);
    void add_char(CharType p_char, int p_texture_idx, const Rect2& p_rect, const Size2& p_align, float p_advance=-1);

    int get_character_count() const;
    Vector<CharType> get_char_keys() const;
    Character get_character(CharType p_char) const;

    int get_texture_count() const;
    Ref<Texture> get_texture(int p_idx) const;

    void add_kerning_pair(CharType p_A,CharType p_B,int p_kerning);
    int get_kerning_pair(CharType p_A,CharType p_B) const;
    Vector<KerningPairKey> get_kerning_pair_keys() const;

    inline Size2 get_char_size(CharType p_char,CharType p_next=0) const;
    Size2 get_string_size(const String& p_string) const;


    void set_fallback(const Ref<Font> &p_fallback);
    Ref<Font> get_fallback() const;

    void clear();

    void set_distance_field_hint(bool p_distance_field);
    bool is_distance_field_hint() const;

    void draw(RID p_canvas_item, const Point2& p_pos, const String& p_text,const Color& p_modulate=Color(1,1,1),int p_clip_w=-1) const;
    void draw_halign(RID p_canvas_item, const Point2& p_pos, HAlign p_align,float p_width,const String& p_text,const Color& p_modulate=Color(1,1,1)) const;
    float draw_char(RID p_canvas_item, const Point2& p_pos, const CharType& p_char,const CharType& p_next=0,const Color& p_modulate=Color(1,1,1)) const;

    Font();
    ~Font();
};


Size2 Font::get_char_size(CharType p_char,CharType p_next) const {

    const Character * c = char_map.getptr(p_char);

    if (!c) {
        if (fallback.is_valid())
            return fallback->get_char_size(p_char,p_next);
        return Size2();
    }

    Size2 ret(c->advance,c->rect.size.y);

    if (p_next) {

        KerningPairKey kpk;
        kpk.A=p_char;
        kpk.B=p_next;

        const Map<KerningPairKey,int>::Element *E=kerning_map.find(kpk);
        if (E) {

            ret.width-=E->get();
        }
    }

    return ret;
}



#endif