g_src/ttf_manager.hpp

   1 #ifndef TTF_MANAGER_HPP
   2 #define TTF_MANAGER_HPP
   3
   4 #include "init.h"
   5 #include "enabler.h"
   6 #ifdef __APPLE__
   7 #include <SDL_ttf/SDL_ttf.h>
   8 #else
   9 #include <SDL/SDL_ttf.h>
  10 #endif
  11 #include <unordered_map>
  12 #include <list>
  13
  14 using std::unordered_map;
  15 using std::list;
  16
  17 struct handleid {
  18   list<ttf_id> text;
  19   justification just;
  20
  21   bool operator< (const handleid &other) const {
  22     if (text != other.text) return text < other.text;
  23     return just < other.just;
  24   }
  25
  26   bool operator== (const handleid &other) const {
  27     return just == other.just && text == other.text;
  28   }
  29 };
  30
  31 namespace std {
  32   template<> struct hash<struct handleid> {
  33     size_t operator()(handleid val) const {
  34       size_t h = 0;
  35       auto end = val.text.cend();
  36       for (auto it = val.text.cbegin(); it != end; ++it) {
  37         h += hash<ttf_id>()(*it);
  38       }
  39       return h + val.just;
  40     }
  41   };
  42 };
  43
  44 struct ttf_details {
  45   int handle;
  46   int offset;
  47   int width;
  48 };
  49
  50 class ttf_managerst {
  51   TTF_Font *font;
  52   int max_handle;
  53   int tile_width, ceiling;
  54   double tab_width;
  55   int em_width;
  56   unordered_map<handleid, ttf_details> handles;
  57   unordered_map<int, SDL_Surface*> textures;
  58   struct todum {
  59     int handle;
  60     list<ttf_id> text;
  61     int height;
  62     int pixel_offset, pixel_width;
  63     todum(int handle, const list<ttf_id> &t, int h, int po, int pw) :
  64       handle(handle), text(t), height(h), pixel_offset(po), pixel_width(pw) {}
  65   };
  66   list<todum> todo;
  67 public:
  68   ttf_managerst() {
  69     font = NULL;
  70     max_handle = 1;
  71     tab_width = 2;
  72     em_width = 8;
  73   }
  74   ~ttf_managerst() {
  75         for (auto it = textures.cbegin(); it != textures.cend(); ++it)
  76                 SDL_FreeSurface(it->second);
  77     if (font) TTF_CloseFont(font);
  78   }
  79   bool init(int ceiling, int tile_width);
  80   bool was_init() const { return font != NULL; }
  81   // Return the expected size of a bit of text, in tiles.
  82   int size_text(const string &text);
  83   ttf_details get_handle(const list<ttf_id> &text, justification just);
  84   // Returns rendered text. Renders too, if necessary.
  85   // The returned SDL_Surface is owned by the ttf_managerst.
  86   SDL_Surface *get_texture(int handle);
  87   // Garbage-collect ttf surfaces
  88   void gc();
  89   // Set tab-stop width (in ems, i.e. tile widths)
  90   void set_tab_width(double width) { tab_width = width; }
  91   // Check if TTF is currently active
  92   bool ttf_active() const {
  93     return was_init() &&
  94       (::init.font.use_ttf == ttf_on ||
  95        (::init.font.use_ttf == ttf_auto && ::init.font.ttf_limit <= ceiling));
  96   }
  97 };
  98
  99 extern ttf_managerst ttf_manager;
 100
 101 #endif