8ceb87193b6cce7c9eae0dd228a56e4f698c9f39
[ccbs] / 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