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 * SCREEN_WIDTH/LOGICAL_SCREEN_WIDTH, 96 * SCREEN_HEIGHT/LOGICAL_SCREEN_HEIGHT))
  42                         throw std::runtime_error("Couldn't set font size");
  43         }
  44
  45         // whoop :-P
  46         xpos = xpos * SCREEN_WIDTH / LOGICAL_SCREEN_WIDTH;
  47         ypos = ypos * SCREEN_HEIGHT / LOGICAL_SCREEN_HEIGHT;
  48
  49         for (widestring::const_iterator i = str.begin(); i != str.end(); ++i) {
  50                 int glyph_index;
  51                 for (std::vector<FT_Face>::const_iterator j = fonts.begin(); j != fonts.end(); ++j) {
  52                         glyph_index = FT_Get_Char_Index(*j, *i);
  53                         if (glyph_index == 0)
  54                                 continue;
  55
  56                         if (FT_Load_Glyph(*j, glyph_index, FT_LOAD_RENDER))
  57                                 throw std::runtime_error("Couldn't load glyph");
  58                         slot = (*j)->glyph;
  59                         break;
  60                 }
  61                 if (glyph_index == 0) {
  62                         std::fprintf(stderr, "Warning: Could not find a glyph in any font for U+%x, ignoring\n", *i);
  63                         continue;
  64                 }
  65
  66                 if (buf != NULL) {
  67                         int y;
  68                         FT_Bitmap *bm = &(slot->bitmap);
  69                         for (y = 0; y < bm->rows; y++) {
  70                                 int xx;
  71                                 int dsty = ypos - slot->bitmap_top + y;
  72                                 if (dsty < 0 || dsty > (SCREEN_HEIGHT-1)) continue;
  73
  74                                 unsigned char *dst = buf + dsty * SCREEN_WIDTH*4 + (x + xpos + slot->bitmap_left)*4;
  75                                 unsigned char *src = bm->buffer + y * bm->width;
  76
  77                                 int width = (x + xpos + slot->bitmap_left + bm->width >= SCREEN_WIDTH) ? ((SCREEN_WIDTH-1) - x - xpos - slot->bitmap_left) : bm->width;
  78                                 for (xx = 0; xx < width; xx++) {
  79                                         *dst = (*dst * (256-*src) + b * *src) >> 8;
  80                                         *dst++;
  81                                         *dst = (*dst * (256-*src) + g * *src) >> 8;
  82                                         *dst++;
  83                                         *dst = (*dst * (256-*src) + r * *src) >> 8;
  84                                         *dst++;
  85                                         *dst++ = 0;
  86                                         src++;
  87                                 }
  88                         }
  89                 }
  90
  91                 x += slot->advance.x >> 6;
  92         }
  93
  94         return x * LOGICAL_SCREEN_WIDTH / SCREEN_WIDTH;
  95 }
  96
  97 void my_draw_text_deferred(std::vector<TextDefer> &td, const widestring &str, double size, int xpos, int ypos)
  98 {
  99         TextDefer newtd;
 100         newtd.str = str;
 101         newtd.size = size;
 102         newtd.xpos = xpos;
 103         newtd.ypos = ypos;
 104         td.push_back(newtd);
 105 }
 106
 107 void draw_all_deferred_text(unsigned char *buf, std::vector<TextDefer> &current, std::vector<TextDefer> &old)
 108 {
 109         for (unsigned i = 0; i < current.size(); ++i) {
 110                 int r, g, b;
 111                 if (i < old.size() && current[i].str != old[i].str) {
 112                         // changed text
 113                         r = 255;
 114                         g = 0;
 115                         b = 0;
 116                 } else {
 117                         r = g = b = 255;
 118                 }
 119
 120                 my_draw_text(current[i].str, buf, current[i].size, current[i].xpos, current[i].ypos, r, g, b);
 121         }
 122 }
 123