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

   1 #include <cstdio>
   2 #include <vector>
   3 #include <stdexcept>
   4 #include <map>
   5 #include <string>
   6 #include "fonts.h"
   7 #include "resolution.h"
   8 #include "theme.h"
   9
  10 extern std::map<std::string, std::string> config;
  11 std::map<std::string, FT_Face> faces;
  12
  13 std::vector<std::string> split(const std::string &str, char delim)
  14 {
  15         std::vector<std::string> ret;
  16         std::string s;
  17         for (unsigned i = 0; i < str.size(); ++i) {
  18                 if (str[i] == delim) {
  19                         ret.push_back(s);
  20                         s.clear();
  21                 } else {
  22                         s.push_back(str[i]);
  23                 }
  24         }
  25         if (!s.empty()) {
  26                 ret.push_back(s);
  27         }
  28         return ret;
  29 }
  30
  31 void init_freetype()
  32 {
  33         FT_Library library;
  34         if (FT_Init_FreeType(&library))
  35                 throw std::runtime_error("FreeType init failed.");
  36
  37         // Preload all fonts.
  38         for (std::map<std::string, std::string>::const_iterator it = config.begin();
  39              it != config.end();
  40              ++it) {
  41                 const std::string key = it->first;
  42                 if (key.size() <= 5 || key.substr(key.size() - 5) != ".font") {
  43                         continue;
  44                 }
  45
  46                 std::vector<std::string> font_list = split(it->second, ';');
  47                 for (unsigned i = 0; i < font_list.size(); ++i) {
  48                         if (faces.count(font_list[i])) {
  49                                 // Already preloaded.
  50                                 continue;
  51                         }
  52
  53                         FT_Face face;
  54                         if (FT_New_Face(library, font_list[i].c_str(), 0, &face)) {
  55                                 fprintf(stderr, "Warning: Couldn't open '%s', some glyphs might not be available\n", font_list[i].c_str());
  56                         } else {
  57                                 faces[font_list[i]] = face;
  58                         }
  59                 }
  60         }
  61 }
  62
  63 void get_glyph(const std::vector<FT_Face> &fonts, wchar_t ch, FT_Face *face, int *glyph_index)
  64 {
  65         for (std::vector<FT_Face>::const_iterator i = fonts.begin(); i != fonts.end(); ++i) {
  66                 *glyph_index = FT_Get_Char_Index(*i, ch);
  67                 if (*glyph_index == 0)
  68                         continue;
  69                 *face = *i;
  70                 return;
  71         }
  72 }
  73
  74 // this should really be done somehow else :-)
  75 static unsigned screen_width, screen_height;
  76 void set_screen_size(unsigned width, unsigned height)
  77 {
  78         screen_width = width;
  79         screen_height = height;
  80 }
  81
  82 unsigned my_draw_text(const widestring &str, unsigned char *buf, double size, const std::string &theme_element, int xpos, int ypos)
  83 {
  84         int x = 0;
  85
  86         int r = atoi(get_theme_config(theme_element, "red").c_str());
  87         int g = atoi(get_theme_config(theme_element, "green").c_str());
  88         int b = atoi(get_theme_config(theme_element, "blue").c_str());
  89         bool use_lcd = atoi(get_theme_config("screen", "lcd").c_str());
  90
  91         // Find font faces.
  92         std::vector<FT_Face> fonts;
  93         std::vector<std::string> font_list = split(get_theme_config(theme_element, "font"), ';');
  94         for (unsigned i = 0; i < font_list.size(); ++i) {
  95                 if (faces.count(font_list[i])) {
  96                         fonts.push_back(faces[font_list[i]]);
  97                 }
  98         }
  99
 100         for (std::vector<FT_Face>::const_iterator i = fonts.begin(); i != fonts.end(); ++i) {
 101                 if (FT_Set_Char_Size(*i, 0, unsigned(size * 64.0), 96 * screen_width/LOGICAL_SCREEN_WIDTH, 96 * screen_height/LOGICAL_SCREEN_HEIGHT))
 102                         throw std::runtime_error("Couldn't set font size");
 103         }
 104
 105         // whoop :-P
 106         xpos = xpos * screen_width / LOGICAL_SCREEN_WIDTH;
 107         ypos = ypos * screen_height / LOGICAL_SCREEN_HEIGHT;
 108
 109         for (widestring::const_iterator i = str.begin(); i != str.end(); ++i) {
 110                 FT_Face face;
 111                 int glyph_index;
 112                 get_glyph(fonts, *i, &face, &glyph_index);
 113                 if (glyph_index == 0) {
 114                         std::fprintf(stderr, "Warning: Could not find a glyph in any font for U+%04x, ignoring\n", *i);
 115                         continue;
 116                 }
 117
 118                 if (use_lcd) {
 119                         if (FT_Load_Glyph(face, glyph_index, FT_LOAD_RENDER | FT_LOAD_TARGET_LCD))
 120                                 throw std::runtime_error("Couldn't load glyph");
 121                 } else {
 122                         if (FT_Load_Glyph(face, glyph_index, FT_LOAD_RENDER))
 123                                 throw std::runtime_error("Couldn't load glyph");
 124                 }
 125
 126                 FT_GlyphSlot slot = face->glyph;
 127                 if (buf != NULL) {
 128                         int y;
 129                         FT_Bitmap *bm = &(slot->bitmap);
 130                         for (y = 0; y < bm->rows; y++) {
 131                                 int xx;
 132                                 int dsty = ypos - slot->bitmap_top + y;
 133                                 if (dsty < 0 || dsty > signed(screen_height-1)) continue;
 134
 135                                 unsigned char *dst = buf + dsty * screen_width*4 + (x + xpos + slot->bitmap_left)*4;
 136                                 unsigned char *src = bm->buffer + y * bm->pitch;
 137                                 if (use_lcd) {
 138                                         int width = (x + xpos + slot->bitmap_left + bm->width/3 >= signed(screen_width)) ? ((screen_width-1) - x - xpos - slot->bitmap_left) : bm->width/3;
 139                                         for (xx = 0; xx < width; xx++) {
 140                                                 *dst = (*dst * (256-src[2]) + b * src[2]) >> 8;
 141                                                 ++dst;
 142                                                 *dst = (*dst * (256-src[1]) + g * src[1]) >> 8;
 143                                                 ++dst;
 144                                                 *dst = (*dst * (256-src[0]) + r * src[0]) >> 8;
 145                                                 ++dst;
 146                                                 *dst++ = 0;
 147
 148                                                 src += 3;
 149                                         }
 150                                 } else {
 151                                         int width = (x + xpos + slot->bitmap_left + bm->width >= signed(screen_width)) ? ((screen_width-1) - x - xpos - slot->bitmap_left) : bm->width;
 152                                         for (xx = 0; xx < width; xx++) {
 153                                                 *dst = (*dst * (256-*src) + b * *src) >> 8;
 154                                                 ++dst;
 155                                                 *dst = (*dst * (256-*src) + g * *src) >> 8;
 156                                                 ++dst;
 157                                                 *dst = (*dst * (256-*src) + r * *src) >> 8;
 158                                                 ++dst;
 159                                                 *dst++ = 0;
 160                                                 ++src;
 161                                         }
 162                                 }
 163                         }
 164                 }
 165
 166                 x += slot->advance.x >> 6;
 167         }
 168
 169         return x * LOGICAL_SCREEN_WIDTH / screen_width;
 170 }
 171
 172 void my_draw_text_deferred(std::vector<TextDefer> &td, const widestring &str, double size, const std::string &theme_element, const std::string &fresh_theme_element, int xpos, int ypos)
 173 {
 174         TextDefer newtd;
 175         newtd.str = str;
 176         newtd.size = size;
 177         newtd.xpos = xpos;
 178         newtd.ypos = ypos;
 179         newtd.theme_element = theme_element;
 180         newtd.fresh_theme_element = fresh_theme_element;
 181         td.push_back(newtd);
 182 }
 183
 184 void draw_all_deferred_text(unsigned char *buf, std::vector<TextDefer> &current, std::vector<TextDefer> &old)
 185 {
 186         for (unsigned i = 0; i < current.size(); ++i) {
 187                 std::string theme_element;
 188                 if (i < old.size() && current[i].str != old[i].str) {
 189                         // changed text
 190                         theme_element = current[i].fresh_theme_element;
 191                 } else {
 192                         theme_element = current[i].theme_element;
 193                 }
 194
 195                 my_draw_text(current[i].str, buf, current[i].size, theme_element, current[i].xpos, current[i].ypos);
 196         }
 197 }
 198