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 // this should really be done somehow else :-)
  36 static unsigned screen_width = SCREEN_WIDTH, screen_height = SCREEN_HEIGHT;
  37 void set_screen_size(unsigned width, unsigned height)
  38 {
  39         screen_width = width;
  40         screen_height = height;
  41 }
  42
  43 unsigned my_draw_text(const widestring &str, unsigned char *buf, double size, int xpos, int ypos, int r, int g, int b)
  44 {
  45         FT_GlyphSlot slot;
  46         int x = 0;
  47
  48         for (std::vector<FT_Face>::const_iterator i = fonts.begin(); i != fonts.end(); ++i) {
  49                 if (FT_Set_Char_Size(*i, 0, unsigned(size * 64.0), 96 * screen_width/LOGICAL_SCREEN_WIDTH, 96 * screen_height/LOGICAL_SCREEN_HEIGHT))
  50                         throw std::runtime_error("Couldn't set font size");
  51         }
  52
  53         // whoop :-P
  54         xpos = xpos * screen_width / LOGICAL_SCREEN_WIDTH;
  55         ypos = ypos * screen_height / LOGICAL_SCREEN_HEIGHT;
  56
  57         for (widestring::const_iterator i = str.begin(); i != str.end(); ++i) {
  58                 int glyph_index;
  59                 for (std::vector<FT_Face>::const_iterator j = fonts.begin(); j != fonts.end(); ++j) {
  60                         glyph_index = FT_Get_Char_Index(*j, *i);
  61                         if (glyph_index == 0)
  62                                 continue;
  63
  64                         if (FT_Load_Glyph(*j, glyph_index, FT_LOAD_RENDER))
  65                                 throw std::runtime_error("Couldn't load glyph");
  66                         slot = (*j)->glyph;
  67                         break;
  68                 }
  69                 if (glyph_index == 0) {
  70                         std::fprintf(stderr, "Warning: Could not find a glyph in any font for U+%x, ignoring\n", *i);
  71                         continue;
  72                 }
  73
  74                 if (buf != NULL) {
  75                         int y;
  76                         FT_Bitmap *bm = &(slot->bitmap);
  77                         for (y = 0; y < bm->rows; y++) {
  78                                 int xx;
  79                                 int dsty = ypos - slot->bitmap_top + y;
  80                                 if (dsty < 0 || dsty > signed(screen_height-1)) continue;
  81
  82                                 unsigned char *dst = buf + dsty * screen_width*4 + (x + xpos + slot->bitmap_left)*4;
  83                                 unsigned char *src = bm->buffer + y * bm->width;
  84
  85                                 int width = (x + xpos + slot->bitmap_left + bm->width >= signed(screen_width)) ? ((screen_width-1) - x - xpos - slot->bitmap_left) : bm->width;
  86                                 for (xx = 0; xx < width; xx++) {
  87                                         *dst = (*dst * (256-*src) + b * *src) >> 8;
  88                                         *dst++;
  89                                         *dst = (*dst * (256-*src) + g * *src) >> 8;
  90                                         *dst++;
  91                                         *dst = (*dst * (256-*src) + r * *src) >> 8;
  92                                         *dst++;
  93                                         *dst++ = 0;
  94                                         src++;
  95                                 }
  96                         }
  97                 }
  98
  99                 x += slot->advance.x >> 6;
 100         }
 101
 102         return x * LOGICAL_SCREEN_WIDTH / screen_width;
 103 }
 104
 105 void my_draw_text_deferred(std::vector<TextDefer> &td, const widestring &str, double size, int xpos, int ypos)
 106 {
 107         TextDefer newtd;
 108         newtd.str = str;
 109         newtd.size = size;
 110         newtd.xpos = xpos;
 111         newtd.ypos = ypos;
 112         td.push_back(newtd);
 113 }
 114
 115 void draw_all_deferred_text(unsigned char *buf, std::vector<TextDefer> &current, std::vector<TextDefer> &old)
 116 {
 117         for (unsigned i = 0; i < current.size(); ++i) {
 118                 int r, g, b;
 119                 if (i < old.size() && current[i].str != old[i].str) {
 120                         // changed text
 121                         r = 255;
 122                         g = 0;
 123                         b = 0;
 124                 } else {
 125                         r = g = b = 255;
 126                 }
 127
 128                 my_draw_text(current[i].str, buf, current[i].size, current[i].xpos, current[i].ypos, r, g, b);
 129         }
 130 }
 131