Add functions for drawing text, try to do so (not very successful yet)

[ccbs] / bigscreen / ccbs_bigscreen.cpp

diff --git a/bigscreen/ccbs_bigscreen.cpp b/bigscreen/ccbs_bigscreen.cpp
index 08d2bf24576fad8da550d4c5f07e7ebdad037638..b6bf216ac3887f5ab71250faedd1ca3b751d00e8 100644 (file)
--- a/bigscreen/ccbs_bigscreen.cpp
+++ b/bigscreen/ccbs_bigscreen.cpp
@@ -1,15 +1,91 @@
 #include <cstdio>
+#include <cstring>
+#include <iconv.h>
 #include <unistd.h>
 #include <pqxx/pqxx>
-#include "glwindow.h"
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include <tinyptc.h>
+
+iconv_t ucs4_iconv;
+
+// UCS-4 string
+class widestring : public std::basic_string<unsigned>
+{
+public:
+       void operator= (const char *from)
+       {
+               unsigned bytes = std::strlen(from);
+               char *from_buf = strdup(from);
+               unsigned *to_buf = new unsigned[bytes + 1];
+
+               char *inptr = from_buf, *outptr = reinterpret_cast<char *> (to_buf);
+
+               size_t in_left = bytes;
+               size_t out_left = bytes * sizeof(unsigned);
+
+               size_t ret = iconv(ucs4_iconv, NULL, NULL, &outptr, &out_left);
+               if (ret == (size_t)(-1)) {
+                       throw std::runtime_error("Error in iconv during initialization");
+               }
+
+               ret = iconv(ucs4_iconv, &inptr, &in_left, &outptr, &out_left);
+               if (ret == (size_t)(-1)) {
+                       perror("iconv");
+                       throw std::runtime_error("Error in iconv during conversion");
+               }
+
+               erase(begin(), end());
+               std::copy(to_buf, reinterpret_cast<unsigned *> (outptr), std::back_inserter(*this));
+
+               free(from_buf);
+               delete[] to_buf;
+       }
+};
+
+template<>
+void std::char_traits<unsigned>::assign(unsigned &to, unsigned const &from)
+{
+       to = from;
+}
+
+template<>
+unsigned *std::char_traits<unsigned>::copy(unsigned *to, unsigned const *from, unsigned n)
+{
+       return static_cast<unsigned *>(memcpy(to, from, n * sizeof(unsigned)));
+}
+
+template<>
+unsigned *std::char_traits<unsigned>::move(unsigned *to, unsigned const *from, unsigned n)
+{
+       return static_cast<unsigned *>(memmove(to, from, n * sizeof(unsigned)));
+}
+
+template<>
+unsigned *std::char_traits<unsigned>::assign(unsigned *to, size_t n, unsigned a)
+{
+       for (unsigned i = 0; i < n; ++i)
+               *to++ = a;
+       return to;
+}
+
+
+template<>
+void pqxx::from_string<widestring>(const char *from, widestring &to)
+{
+       to = from;
+}
+
+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);
 
 class Tournament {
 public:
        int id;
-       std::string name;
+       widestring name;
 };
 
 Tournament active_tournament;
+FT_Face font;
 
 /* A trigger that sets a flag whenever it's trigged. */
 class FlagTrigger : pqxx::trigger {
@@ -72,6 +148,8 @@ void init(pqxx::connection &conn)
        }
 }
 
+unsigned char framebuf[800 * 600 * 4];
+
 void main_loop(pqxx::connection &conn)
 {
        if (active_tournament.id == -1) {
@@ -84,18 +162,77 @@ void main_loop(pqxx::connection &conn)
 
        // fetch all songs
        pqxx::result res( t.exec("SELECT * FROM songs") );
+       unsigned y = 0;
        for (pqxx::result::const_iterator i = res.begin(); i != res.end(); ++i) {
+               my_draw_text(i["title"].as(widestring()), framebuf, 0, y, 1, 255, 255, 255, font);
+               y += 20;
                std::fprintf(stderr, "%s\n", i["title"].c_str());
        }
        t.commit();
-       
+
+       ptc_update(framebuf);
        sleep(1);
 }
 
+void init_freetype()
+{
+       FT_Library library;
+       if (FT_Init_FreeType(&library))
+               throw std::logic_error("FreeType init failed.");
+       if (FT_New_Face(library, "/usr/share/fonts/truetype/msttcorefonts/Georgia.ttf", 0, &font))
+               throw std::logic_error("Face opening failed.");
+       if (FT_Set_Char_Size(font, 0, 12 * 64, 96, 96))
+               throw std::logic_error("Size set failed.");
+}
+
+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)
+{
+       FT_GlyphSlot slot = face->glyph;
+       int x = 0;
+
+       for (widestring::const_iterator i = str.begin(); i != str.end(); ++i) { 
+               int glyph_index = FT_Get_Char_Index(face, *i);
+               if (FT_Load_Glyph(face, glyph_index, FT_LOAD_RENDER))
+                       continue;
+
+               if (real_render) {
+                       int y;
+                       FT_Bitmap *bm = &(slot->bitmap);
+                       for (y = 0; y < bm->rows; y++) {
+                               int xx;
+                               int dsty = ypos - slot->bitmap_top + y;
+                               if (dsty < 0 || dsty > 599) continue;
+
+                               unsigned char *dst = buf + dsty * 800*4 + (x + xpos + slot->bitmap_left)*4;
+                               unsigned char *src = bm->buffer + y * bm->width;
+                               for (xx = 0; xx < bm->width; xx++) {
+                                       *dst = (*dst * (256-*src) + r * *src) >> 8;
+                                       *dst++;
+                                       *dst = (*dst * (256-*src) + g * *src) >> 8;
+                                       *dst++;
+                                       *dst = (*dst * (256-*src) + b * *src) >> 8;
+                                       *dst++;
+                                       *dst++ = 0;
+                                       src++;
+                               }
+                       }
+               }
+
+               x += slot->advance.x >> 6;
+       }
+
+       return x;
+}
+
+
 int main(int argc, char **argv)
 {
-       GLWindow glw("CCBS bigscreen", 800, 600, 32, false, 16, -1);
+       ucs4_iconv = iconv_open("ucs-4", "utf-8");
+       
+       ptc_open("CCBS bigscreen", 800, 600);
+       
        try {
+               init_freetype();
                pqxx::connection conn("dbname=ccbs host=altersex.samfundet.no user=ccbs password=GeT|>>B_");
                FlagTrigger tournament_changed(conn, "active_tournament");