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 SCREEN_LCD
  65                         if (FT_Load_Glyph(*j, glyph_index, FT_LOAD_RENDER | FT_LOAD_TARGET_LCD))
  66 #else
  67                         if (FT_Load_Glyph(*j, glyph_index, FT_LOAD_RENDER))
  68 #endif
  69                                 throw std::runtime_error("Couldn't load glyph");
  70                         slot = (*j)->glyph;
  71                         break;
  72                 }
  73                 if (glyph_index == 0) {
  74                         std::fprintf(stderr, "Warning: Could not find a glyph in any font for U+%x, ignoring\n", *i);
  75                         continue;
  76                 }
  77
  78                 if (buf != NULL) {
  79                         int y;
  80                         FT_Bitmap *bm = &(slot->bitmap);
  81                         for (y = 0; y < bm->rows; y++) {
  82                                 int xx;
  83                                 int dsty = ypos - slot->bitmap_top + y;
  84                                 if (dsty < 0 || dsty > signed(screen_height-1)) continue;
  85
  86                                 unsigned char *dst = buf + dsty * screen_width*4 + (x + xpos + slot->bitmap_left)*4;
  87 #if SCREEN_LCD
  88                                 unsigned char *src = bm->buffer + y * bm->pitch;
  89                                 int width = (x + xpos + slot->bitmap_left + bm->width/3 >= signed(screen_width)) ? ((screen_width-1) - x - xpos - slot->bitmap_left) : bm->width/3;
  90 #else
  91                                 unsigned char *src = bm->buffer + y * bm->pitch;
  92                                 int width = (x + xpos + slot->bitmap_left + bm->width >= signed(screen_width)) ? ((screen_width-1) - x - xpos - slot->bitmap_left) : bm->width;
  93 #endif
  94
  95 #if SCREEN_LCD
  96                                 for (xx = 0; xx < width; xx++) {
  97                                         *dst = (*dst * (256-src[2]) + b * src[2]) >> 8;
  98                                         ++dst;
  99                                         *dst = (*dst * (256-src[1]) + g * src[1]) >> 8;
 100                                         ++dst;
 101                                         *dst = (*dst * (256-src[0]) + r * src[0]) >> 8;
 102                                         ++dst;
 103                                         *dst++ = 0;
 104
 105                                         src += 3;
 106                                 }
 107 #else
 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 #endif
 119                         }
 120                 }
 121
 122                 x += slot->advance.x >> 6;
 123         }
 124
 125         return x * LOGICAL_SCREEN_WIDTH / screen_width;
 126 }
 127
 128 void my_draw_text_deferred(std::vector<TextDefer> &td, const widestring &str, double size, int xpos, int ypos)
 129 {
 130         TextDefer newtd;
 131         newtd.str = str;
 132         newtd.size = size;
 133         newtd.xpos = xpos;
 134         newtd.ypos = ypos;
 135         td.push_back(newtd);
 136 }
 137
 138 void draw_all_deferred_text(unsigned char *buf, std::vector<TextDefer> &current, std::vector<TextDefer> &old)
 139 {
 140         for (unsigned i = 0; i < current.size(); ++i) {
 141                 int r, g, b;
 142                 if (i < old.size() && current[i].str != old[i].str) {
 143                         // changed text
 144                         r = 255;
 145                         g = 0;
 146                         b = 0;
 147                 } else {
 148                         r = g = b = 255;
 149                 }
 150
 151                 my_draw_text(current[i].str, buf, current[i].size, current[i].xpos, current[i].ypos, r, g, b);
 152         }
 153 }
 154