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

   1 #include <vector>
   2 #include <stdexcept>
   3 #include "fonts.h"
   4 #include "resolution.h"
   5
   6 std::vector<FT_Face> fonts;
   7
   8 void init_freetype()
   9 {
  10         FT_Library library;
  11         FT_Face face;
  12         if (FT_Init_FreeType(&library))
  13                 throw std::runtime_error("FreeType init failed.");
  14
  15         // Georgia
  16         if (FT_New_Face(library, "/usr/share/fonts/truetype/msttcorefonts/Georgia.ttf", 0, &face))
  17                 throw std::runtime_error("Face opening failed.");
  18         fonts.push_back(face);
  19
  20         // FreeSerif
  21         if (FT_New_Face(library, "/usr/share/fonts/truetype/freefont/FreeSerif.ttf", 0, &face)) {
  22                 std::fprintf(stderr, "Warning: Couldn't open FreeSerif, some glyphs might not be available\n");
  23         } else {
  24                 fonts.push_back(face);
  25         }
  26
  27         // Arial Unicode MS
  28         if (FT_New_Face(library, "arialuni.ttf", 0, &face)) {
  29                 std::fprintf(stderr, "Warning: Couldn't open Arial Unicode MS, some glyphs might not be available\n");
  30         } else {
  31                 fonts.push_back(face);
  32         }
  33 }
  34
  35 unsigned my_draw_text(const widestring &str, unsigned char *buf, double size, int xpos, int ypos, int r, int g, int b)
  36 {
  37         FT_GlyphSlot slot;
  38         int x = 0;
  39
  40         for (std::vector<FT_Face>::const_iterator i = fonts.begin(); i != fonts.end(); ++i) {
  41                 if (FT_Set_Char_Size(*i, 0, unsigned(size * 64.0), 96, 96))
  42                         throw std::runtime_error("Couldn't set font size");
  43         }
  44
  45         for (widestring::const_iterator i = str.begin(); i != str.end(); ++i) {
  46                 int glyph_index;
  47                 for (std::vector<FT_Face>::const_iterator j = fonts.begin(); j != fonts.end(); ++j) {
  48                         glyph_index = FT_Get_Char_Index(*j, *i);
  49                         if (glyph_index == 0)
  50                                 continue;
  51
  52                         if (FT_Load_Glyph(*j, glyph_index, FT_LOAD_RENDER))
  53                                 throw std::runtime_error("Couldn't load glyph");
  54                         slot = (*j)->glyph;
  55                         break;
  56                 }
  57                 if (glyph_index == 0) {
  58                         std::fprintf(stderr, "Warning: Could not find a glyph in any font for U+%x, ignoring\n", *i);
  59                         continue;
  60                 }
  61
  62                 if (buf != NULL) {
  63                         int y;
  64                         FT_Bitmap *bm = &(slot->bitmap);
  65                         for (y = 0; y < bm->rows; y++) {
  66                                 int xx;
  67                                 int dsty = ypos - slot->bitmap_top + y;
  68                                 if (dsty < 0 || dsty > (SCREEN_HEIGHT-1)) continue;
  69
  70                                 unsigned char *dst = buf + dsty * SCREEN_WIDTH*4 + (x + xpos + slot->bitmap_left)*4;
  71                                 unsigned char *src = bm->buffer + y * bm->width;
  72
  73                                 int width = (x + xpos + slot->bitmap_left + bm->width >= SCREEN_WIDTH) ? ((SCREEN_WIDTH-1) - x - xpos - slot->bitmap_left) : bm->width;
  74                                 for (xx = 0; xx < width; xx++) {
  75                                         *dst = (*dst * (256-*src) + b * *src) >> 8;
  76                                         *dst++;
  77                                         *dst = (*dst * (256-*src) + g * *src) >> 8;
  78                                         *dst++;
  79                                         *dst = (*dst * (256-*src) + r * *src) >> 8;
  80                                         *dst++;
  81                                         *dst++ = 0;
  82                                         src++;
  83                                 }
  84                         }
  85                 }
  86
  87                 x += slot->advance.x >> 6;
  88         }
  89
  90         return x;
  91 }
  92
  93 void my_draw_text_deferred(std::vector<TextDefer> &td, const widestring &str, double size, int xpos, int ypos)
  94 {
  95         TextDefer newtd;
  96         newtd.str = str;
  97         newtd.size = size;
  98         newtd.xpos = xpos;
  99         newtd.ypos = ypos;
 100         td.push_back(newtd);
 101 }
 102
 103 void draw_all_deferred_text(unsigned char *buf, std::vector<TextDefer> &current, std::vector<TextDefer> &old)
 104 {
 105         for (unsigned i = 0; i < current.size(); ++i) {
 106                 int r, g, b;
 107                 if (i < old.size() && current[i].str != old[i].str) {
 108                         // changed text
 109                         r = 255;
 110                         g = 0;
 111                         b = 0;
 112                 } else {
 113                         r = g = b = 255;
 114                 }
 115
 116                 my_draw_text(current[i].str, buf, current[i].size, current[i].xpos, current[i].ypos, r, g, b);
 117         }
 118 }
 119