git.sesse.net Git - ccbs/blob - bigscreen/ccbs_bigscreen.cpp

   1 #include <cstdio>
   2 #include <cstring>
   3 #include <iconv.h>
   4 #include <unistd.h>
   5 #include <pqxx/pqxx>
   6 #include <ft2build.h>
   7 #include FT_FREETYPE_H
   8 #include <tinyptc.h>
   9
  10 iconv_t ucs4_iconv;
  11
  12 // UCS-4 string
  13 class widestring : public std::basic_string<unsigned>
  14 {
  15 public:
  16         void operator= (const char *from)
  17         {
  18                 unsigned bytes = std::strlen(from);
  19                 char *from_buf = strdup(from);
  20                 unsigned *to_buf = new unsigned[bytes + 1];
  21
  22                 char *inptr = from_buf, *outptr = reinterpret_cast<char *> (to_buf);
  23
  24                 size_t in_left = bytes;
  25                 size_t out_left = bytes * sizeof(unsigned);
  26
  27                 size_t ret = iconv(ucs4_iconv, NULL, NULL, &outptr, &out_left);
  28                 if (ret == (size_t)(-1)) {
  29                         throw std::runtime_error("Error in iconv during initialization");
  30                 }
  31
  32                 ret = iconv(ucs4_iconv, &inptr, &in_left, &outptr, &out_left);
  33                 if (ret == (size_t)(-1)) {
  34                         perror("iconv");
  35                         throw std::runtime_error("Error in iconv during conversion");
  36                 }
  37
  38                 erase(begin(), end());
  39                 std::copy(to_buf, reinterpret_cast<unsigned *> (outptr), std::back_inserter(*this));
  40
  41                 free(from_buf);
  42                 delete[] to_buf;
  43         }
  44 };
  45
  46 template<>
  47 void std::char_traits<unsigned>::assign(unsigned &to, unsigned const &from)
  48 {
  49         to = from;
  50 }
  51
  52 template<>
  53 unsigned *std::char_traits<unsigned>::copy(unsigned *to, unsigned const *from, unsigned n)
  54 {
  55         return static_cast<unsigned *>(memcpy(to, from, n * sizeof(unsigned)));
  56 }
  57
  58 template<>
  59 unsigned *std::char_traits<unsigned>::move(unsigned *to, unsigned const *from, unsigned n)
  60 {
  61         return static_cast<unsigned *>(memmove(to, from, n * sizeof(unsigned)));
  62 }
  63
  64 template<>
  65 unsigned *std::char_traits<unsigned>::assign(unsigned *to, size_t n, unsigned a)
  66 {
  67         for (unsigned i = 0; i < n; ++i)
  68                 *to++ = a;
  69         return to;
  70 }
  71
  72
  73 template<>
  74 void pqxx::from_string<widestring>(const char *from, widestring &to)
  75 {
  76         to = from;
  77 }
  78
  79 int my_draw_text(const widestring &str, unsigned char *buf, int xpos, int ypos, bool real_render, int r, int g, int b, FT_Face face);
  80
  81 class Tournament {
  82 public:
  83         int id;
  84         widestring name;
  85 };
  86
  87 Tournament active_tournament;
  88 FT_Face font;
  89
  90 /* A trigger that sets a flag whenever it's trigged. */
  91 class FlagTrigger : pqxx::trigger {
  92 private:
  93         bool flag;
  94
  95 public:
  96         FlagTrigger(pqxx::connection_base &conn, const PGSTD::string &name)
  97                 : pqxx::trigger(conn, name), flag(false) {}
  98         virtual ~FlagTrigger() throw () {}
  99
 100         virtual void operator() (int pid)
 101         {
 102                 flag = true;
 103                 std::fprintf(stderr, "Received a flag trigger from pid %u\n", pid);
 104         }
 105
 106         bool get_flag() const
 107         {
 108                 return flag;
 109         }
 110
 111         void reset_flag()
 112         {
 113                 flag = false;
 114         }
 115 };
 116
 117 /* A transactor that fetches the current tournament and some information about it. */
 118 class FetchCurrentTournament : public pqxx::transactor<> {
 119 private:
 120         Tournament *tourn;
 121
 122 public:
 123         FetchCurrentTournament(Tournament *tourn) : tourn(tourn) {}
 124         void operator() (pqxx::transaction<> &t)
 125         {
 126                 pqxx::result res( t.exec("SELECT * FROM bigscreen.active_tournament NATURAL JOIN tournaments") );
 127                 try {
 128                         pqxx::result::tuple tournament = res.at(0);
 129
 130                         tourn->id = tournament["tournament"].as(tourn->id);
 131                         tourn->name = tournament["tournamentname"].as(tourn->name);
 132                 } catch (PGSTD::out_of_range &e) {
 133                         tourn->id = -1;
 134                         tourn->name = "";
 135                 }
 136         }
 137 };
 138
 139 void init(pqxx::connection &conn)
 140 {
 141         conn.perform(FetchCurrentTournament(&active_tournament));
 142
 143         if (active_tournament.id == -1) {
 144                 std::fprintf(stderr, "No active tournament\n");
 145         } else {
 146                 std::fprintf(stderr, "Current tournament is %d (name: '%s')\n",
 147                         active_tournament.id, active_tournament.name.c_str());
 148         }
 149 }
 150
 151 unsigned char framebuf[800 * 600 * 4];
 152
 153 void main_loop(pqxx::connection &conn)
 154 {
 155         if (active_tournament.id == -1) {
 156                 // No active tournament, sleep a second or so and exit
 157                 sleep(1);
 158                 return;
 159         }
 160
 161         pqxx::work t(conn, "trx");
 162
 163         // fetch all songs
 164         pqxx::result res( t.exec("SELECT * FROM songs") );
 165         unsigned y = 0;
 166         for (pqxx::result::const_iterator i = res.begin(); i != res.end(); ++i) {
 167                 my_draw_text(i["title"].as(widestring()), framebuf, 0, y, 1, 255, 255, 255, font);
 168                 y += 20;
 169                 std::fprintf(stderr, "%s\n", i["title"].c_str());
 170         }
 171         t.commit();
 172
 173         ptc_update(framebuf);
 174         sleep(1);
 175 }
 176
 177 void init_freetype()
 178 {
 179         FT_Library library;
 180         if (FT_Init_FreeType(&library))
 181                 throw std::logic_error("FreeType init failed.");
 182         if (FT_New_Face(library, "/usr/share/fonts/truetype/msttcorefonts/Georgia.ttf", 0, &font))
 183                 throw std::logic_error("Face opening failed.");
 184         if (FT_Set_Char_Size(font, 0, 12 * 64, 96, 96))
 185                 throw std::logic_error("Size set failed.");
 186 }
 187
 188 int my_draw_text(const widestring &str, unsigned char *buf, int xpos, int ypos, bool real_render, int r, int g, int b, FT_Face face)
 189 {
 190         FT_GlyphSlot slot = face->glyph;
 191         int x = 0;
 192
 193         for (widestring::const_iterator i = str.begin(); i != str.end(); ++i) {
 194                 int glyph_index = FT_Get_Char_Index(face, *i);
 195                 if (FT_Load_Glyph(face, glyph_index, FT_LOAD_RENDER))
 196                         continue;
 197
 198                 if (real_render) {
 199                         int y;
 200                         FT_Bitmap *bm = &(slot->bitmap);
 201                         for (y = 0; y < bm->rows; y++) {
 202                                 int xx;
 203                                 int dsty = ypos - slot->bitmap_top + y;
 204                                 if (dsty < 0 || dsty > 599) continue;
 205
 206                                 unsigned char *dst = buf + dsty * 800*4 + (x + xpos + slot->bitmap_left)*4;
 207                                 unsigned char *src = bm->buffer + y * bm->width;
 208                                 for (xx = 0; xx < bm->width; xx++) {
 209                                         *dst = (*dst * (256-*src) + r * *src) >> 8;
 210                                         *dst++;
 211                                         *dst = (*dst * (256-*src) + g * *src) >> 8;
 212                                         *dst++;
 213                                         *dst = (*dst * (256-*src) + b * *src) >> 8;
 214                                         *dst++;
 215                                         *dst++ = 0;
 216                                         src++;
 217                                 }
 218                         }
 219                 }
 220
 221                 x += slot->advance.x >> 6;
 222         }
 223
 224         return x;
 225 }
 226
 227
 228 int main(int argc, char **argv)
 229 {
 230         ucs4_iconv = iconv_open("ucs-4le", "utf-8");   // FIXME: will be broken for big endian!
 231
 232         ptc_open("CCBS bigscreen", 800, 600);
 233
 234         try {
 235                 init_freetype();
 236                 pqxx::connection conn("dbname=ccbs host=altersex.samfundet.no user=ccbs password=GeT|>>B_");
 237                 FlagTrigger tournament_changed(conn, "active_tournament");
 238
 239                 // when active_tournament is changed, we destroy everything and start from scratch
 240                 for ( ;; ) {
 241                         tournament_changed.reset_flag();
 242                         init(conn);
 243                         do {
 244                                 main_loop(conn);
 245                                 conn.get_notifs();
 246                         } while (!tournament_changed.get_flag());
 247                         std::fprintf(stderr, "active_tournament changed, resetting...\n");
 248                 }
 249         } catch (const std::exception &e) {
 250                 std::fprintf(stderr, "Exception: %s\n", e.what());
 251                 exit(1);
 252         }
 253
 254         return 0;
 255 }