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         *glyph_index = 0;
  66         for (std::vector<FT_Face>::const_iterator i = fonts.begin(); i != fonts.end(); ++i) {
  67                 *glyph_index = FT_Get_Char_Index(*i, ch);
  68                 if (*glyph_index == 0)
  69                         continue;
  70                 *face = *i;
  71                 return;
  72         }
  73 }
  74
  75 // this should really be done somehow else :-)
  76 static unsigned screen_width, screen_height;
  77 void set_screen_size(unsigned width, unsigned height)
  78 {
  79         screen_width = width;
  80         screen_height = height;
  81 }
  82
  83 void render_glyph(FT_GlyphSlot slot, int glyphx, int glyphy, unsigned char *buf, int r, int g, int b, bool use_lcd)
  84 {
  85         FT_Bitmap *bm = &(slot->bitmap);
  86         for (unsigned y = 0; y < bm->rows; y++) {
  87                 int xx;
  88                 int dsty = glyphy - slot->bitmap_top + y;
  89                 if (dsty < 0 || dsty > signed(screen_height-1)) continue;
  90
  91                 unsigned char *dst = buf + dsty * screen_width*4 + (glyphx + slot->bitmap_left)*4;
  92                 unsigned char *src = bm->buffer + y * bm->pitch;
  93                 if (use_lcd) {
  94                         int width = (glyphx + slot->bitmap_left + bm->width/3 >= signed(screen_width)) ? ((screen_width-1) - glyphx - slot->bitmap_left) : bm->width/3;
  95                         for (xx = 0; xx < width; xx++) {
  96                                 *dst = (*dst * (256-src[2]) + b * src[2]) >> 8;
  97                                 ++dst;
  98                                 *dst = (*dst * (256-src[1]) + g * src[1]) >> 8;
  99                                 ++dst;
 100                                 *dst = (*dst * (256-src[0]) + r * src[0]) >> 8;
 101                                 ++dst;
 102                                 *dst++ = 0;
 103
 104                                 src += 3;
 105                         }
 106                 } else {
 107                         int width = (glyphx + slot->bitmap_left + bm->width >= signed(screen_width)) ? ((screen_width-1) - glyphx - slot->bitmap_left) : bm->width;
 108                         for (xx = 0; xx < width; xx++) {
 109                                 *dst = (*dst * (256-*src) + b * *src) >> 8;
 110                                 ++dst;
 111                                 *dst = (*dst * (256-*src) + g * *src) >> 8;
 112                                 ++dst;
 113                                 *dst = (*dst * (256-*src) + r * *src) >> 8;
 114                                 ++dst;
 115                                 *dst++ = 0;
 116                                 ++src;
 117                         }
 118                 }
 119         }
 120 }
 121
 122 unsigned my_draw_text(const widestring &str, unsigned char *buf, double size, const std::string &theme_element, int xpos, int ypos)
 123 {
 124         int start_xpos = xpos;
 125
 126         int r = atoi(get_theme_config(theme_element, "red").c_str());
 127         int g = atoi(get_theme_config(theme_element, "green").c_str());
 128         int b = atoi(get_theme_config(theme_element, "blue").c_str());
 129         bool use_lcd = atoi(get_theme_config("screen", "lcd").c_str());
 130
 131         // Find font faces.
 132         std::vector<FT_Face> fonts;
 133         std::vector<std::string> font_list = split(get_theme_config(theme_element, "font"), ';');
 134         for (unsigned i = 0; i < font_list.size(); ++i) {
 135                 if (faces.count(font_list[i])) {
 136                         fonts.push_back(faces[font_list[i]]);
 137                 }
 138         }
 139
 140         for (std::vector<FT_Face>::const_iterator i = fonts.begin(); i != fonts.end(); ++i) {
 141                 if (FT_Set_Char_Size(*i, 0, unsigned(size * 64.0), 96 * screen_width/LOGICAL_SCREEN_WIDTH, 96 * screen_height/LOGICAL_SCREEN_HEIGHT))
 142                         throw std::runtime_error("Couldn't set font size");
 143         }
 144
 145         // whoop :-P
 146         xpos = xpos * screen_width / LOGICAL_SCREEN_WIDTH;
 147         ypos = ypos * screen_height / LOGICAL_SCREEN_HEIGHT;
 148
 149         for (widestring::const_iterator i = str.begin(); i != str.end(); ++i) {
 150                 FT_Face face;
 151                 int glyph_index;
 152                 get_glyph(fonts, *i, &face, &glyph_index);
 153                 if (glyph_index == 0) {
 154                         std::fprintf(stderr, "Warning: Could not find a glyph in any font for U+%04x, ignoring\n", *i);
 155                         continue;
 156                 }
 157
 158                 if (use_lcd) {
 159                         if (FT_Load_Glyph(face, glyph_index, FT_LOAD_RENDER | FT_LOAD_TARGET_LCD))
 160                                 throw std::runtime_error("Couldn't load glyph");
 161                 } else {
 162                         if (FT_Load_Glyph(face, glyph_index, FT_LOAD_RENDER))
 163                                 throw std::runtime_error("Couldn't load glyph");
 164                 }
 165
 166                 if (buf != NULL) {
 167                         render_glyph(face->glyph, xpos, ypos, buf, r, g, b, use_lcd);
 168                 }
 169
 170                 xpos += face->glyph->advance.x / 64;
 171                 ypos -= face->glyph->advance.y / 64;
 172         }
 173
 174         return (xpos - start_xpos) * LOGICAL_SCREEN_WIDTH / screen_width;
 175 }
 176
 177 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)
 178 {
 179         TextDefer newtd;
 180         newtd.str = str;
 181         newtd.size = size;
 182         newtd.xpos = xpos;
 183         newtd.ypos = ypos;
 184         newtd.theme_element = theme_element;
 185         newtd.fresh_theme_element = fresh_theme_element;
 186         td.push_back(newtd);
 187 }
 188
 189 void draw_all_deferred_text(unsigned char *buf, std::vector<TextDefer> &current, std::vector<TextDefer> &old)
 190 {
 191         for (unsigned i = 0; i < current.size(); ++i) {
 192                 std::string theme_element;
 193                 if (i < old.size() && current[i].str != old[i].str) {
 194                         // changed text
 195                         theme_element = current[i].fresh_theme_element;
 196                 } else {
 197                         theme_element = current[i].theme_element;
 198                 }
 199
 200                 my_draw_text(current[i].str, buf, current[i].size, theme_element, current[i].xpos, current[i].ypos);
 201         }
 202 }
 203