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