1 | // |
---|
2 | // glbitmapfont.cc |
---|
3 | // |
---|
4 | // Draw text using glBitmap. |
---|
5 | // |
---|
6 | // Copyright (C) 2011-2022 Olly Betts |
---|
7 | // |
---|
8 | // This program is free software; you can redistribute it and/or modify |
---|
9 | // it under the terms of the GNU General Public License as published by |
---|
10 | // the Free Software Foundation; either version 2 of the License, or |
---|
11 | // (at your option) any later version. |
---|
12 | // |
---|
13 | // This program is distributed in the hope that it will be useful, |
---|
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
16 | // GNU General Public License for more details. |
---|
17 | // |
---|
18 | // You should have received a copy of the GNU General Public License |
---|
19 | // along with this program; if not, write to the Free Software |
---|
20 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
---|
21 | // |
---|
22 | |
---|
23 | #ifdef HAVE_CONFIG_H |
---|
24 | #include <config.h> |
---|
25 | #endif |
---|
26 | |
---|
27 | #include "glbitmapfont.h" |
---|
28 | |
---|
29 | #include "aventypes.h" |
---|
30 | #include "gllogerror.h" |
---|
31 | #include "useful.h" |
---|
32 | #include "wx.h" |
---|
33 | |
---|
34 | #include <cerrno> |
---|
35 | #include <cstdint> |
---|
36 | #ifdef HAVE_MMAP |
---|
37 | #include <sys/mman.h> |
---|
38 | #else |
---|
39 | #include <unistd.h> |
---|
40 | #endif |
---|
41 | |
---|
42 | using namespace std; |
---|
43 | |
---|
44 | #include "../lib/preload_font.h" |
---|
45 | |
---|
46 | BitmapFont::~BitmapFont() { |
---|
47 | if (!gllist_base) return; |
---|
48 | glDeleteLists(gllist_base, BITMAPFONT_MAX_CHAR); |
---|
49 | CHECK_GL_ERROR("BitmapFont::~BitmapFont", "glDeleteLists"); |
---|
50 | } |
---|
51 | |
---|
52 | static uint16_t* tab_2x = NULL; |
---|
53 | static uint16_t* fontdata_2x = NULL; |
---|
54 | static uint16_t* fontdata_2x_extra = NULL; |
---|
55 | |
---|
56 | bool |
---|
57 | BitmapFont::load(const wxString & font_file_, bool double_size) |
---|
58 | { |
---|
59 | font_file = font_file_; |
---|
60 | |
---|
61 | font_size = double_size ? 32 : 16; |
---|
62 | |
---|
63 | if (!gllist_base) { |
---|
64 | gllist_base = glGenLists(BITMAPFONT_MAX_CHAR); |
---|
65 | CHECK_GL_ERROR("BitmapFont::load", "glGenLists"); |
---|
66 | } |
---|
67 | |
---|
68 | if (double_size && !tab_2x) { |
---|
69 | tab_2x = new uint16_t[256]; |
---|
70 | for (unsigned i = 0; i < 256; ++i) { |
---|
71 | unsigned v = (i & 1) << 8 | |
---|
72 | (i & 2) << 9 | |
---|
73 | (i & 4) << 10 | |
---|
74 | (i & 8) << 11 | |
---|
75 | (i & 16) >> 4 | |
---|
76 | (i & 32) >> 3 | |
---|
77 | (i & 64) >> 2 | |
---|
78 | (i & 128) >> 1; |
---|
79 | tab_2x[i] = 3 * v; |
---|
80 | } |
---|
81 | fontdata_2x = new uint16_t[sizeof(fontdata_preloaded) * 2]; |
---|
82 | } |
---|
83 | const unsigned char * p = fontdata_preloaded; |
---|
84 | const unsigned char * end = p + sizeof(fontdata_preloaded); |
---|
85 | uint16_t* out = fontdata_2x; |
---|
86 | for (int ch = 0; ch < BITMAPFONT_MAX_CHAR; ++ch) { |
---|
87 | glNewList(gllist_base + ch, GL_COMPILE); |
---|
88 | CHECK_GL_ERROR("BitmapFont::load", "glNewList"); |
---|
89 | if (p == end) { |
---|
90 | return false; |
---|
91 | } |
---|
92 | unsigned int byte_width = *p++; |
---|
93 | |
---|
94 | char_width[ch] = (byte_width & 0x0f) + 2; |
---|
95 | byte_width >>= 6; |
---|
96 | |
---|
97 | int start = 0; |
---|
98 | unsigned int n = 0; |
---|
99 | if (byte_width) { |
---|
100 | if (p == end) { |
---|
101 | return false; |
---|
102 | } |
---|
103 | unsigned int start_and_n = *p++; |
---|
104 | start = start_and_n >> 4; |
---|
105 | n = (start_and_n & 15) + 1; |
---|
106 | |
---|
107 | if (unsigned(end - p) < n * byte_width) { |
---|
108 | return false; |
---|
109 | } |
---|
110 | } |
---|
111 | |
---|
112 | // Note that even if there's nothing to display, we still call |
---|
113 | // glBitmap() to advance the raster position. |
---|
114 | if (double_size) { |
---|
115 | const GLubyte* q = reinterpret_cast<const GLubyte*>(out); |
---|
116 | for (unsigned i = 0; i != n; ++i) { |
---|
117 | for (unsigned j = 0; j != byte_width; ++j) { |
---|
118 | *out++ = tab_2x[*p++]; |
---|
119 | } |
---|
120 | memcpy(out, out - byte_width, byte_width * sizeof(uint16_t)); |
---|
121 | out += byte_width; |
---|
122 | } |
---|
123 | |
---|
124 | char_width[ch] *= 2; |
---|
125 | glBitmap(2 * 8 * byte_width, 2 * n, 0, -2 * start, char_width[ch], 0, q); |
---|
126 | } else { |
---|
127 | glBitmap(8 * byte_width, n, 0, -start, char_width[ch], 0, p); |
---|
128 | p += n * byte_width; |
---|
129 | } |
---|
130 | CHECK_GL_ERROR("BitmapFont::load", "glBitmap"); |
---|
131 | glEndList(); |
---|
132 | CHECK_GL_ERROR("BitmapFont::load", "glEndList"); |
---|
133 | } |
---|
134 | |
---|
135 | return true; |
---|
136 | } |
---|
137 | |
---|
138 | inline void call_lists(GLsizei n, const GLvoid * lists) |
---|
139 | { |
---|
140 | #if SIZEOF_WXCHAR == 1 |
---|
141 | glCallLists(n, GL_UNSIGNED_BYTE, lists); |
---|
142 | #elif SIZEOF_WXCHAR == 2 |
---|
143 | glCallLists(n, GL_UNSIGNED_SHORT, lists); |
---|
144 | #elif SIZEOF_WXCHAR == 4 |
---|
145 | glCallLists(n, GL_UNSIGNED_INT, lists); |
---|
146 | #else |
---|
147 | # error "sizeof(wxChar) not 1, 2 or 4" |
---|
148 | #endif |
---|
149 | } |
---|
150 | |
---|
151 | void |
---|
152 | BitmapFont::init_extra_chars() const |
---|
153 | { |
---|
154 | bool double_size = (tab_2x != NULL); |
---|
155 | int fd = wxOpen(font_file, |
---|
156 | #ifdef __WXMSW__ |
---|
157 | _O_RDONLY|_O_SEQUENTIAL|_O_BINARY, |
---|
158 | #else |
---|
159 | O_RDONLY, |
---|
160 | #endif |
---|
161 | 0); |
---|
162 | |
---|
163 | int data_len = 0; |
---|
164 | unsigned char * data = NULL; |
---|
165 | if (fd >= 0) { |
---|
166 | struct stat sb; |
---|
167 | if (fstat(fd, &sb) >= 0) { |
---|
168 | data_len = sb.st_size; |
---|
169 | } |
---|
170 | } |
---|
171 | |
---|
172 | #if HAVE_MMAP |
---|
173 | if (data_len) { |
---|
174 | void * p = mmap(NULL, data_len, PROT_READ, MAP_SHARED, fd, 0); |
---|
175 | if (p == MAP_FAILED) { |
---|
176 | data_len = 0; |
---|
177 | } else { |
---|
178 | extra_data = data = static_cast<unsigned char*>(p); |
---|
179 | } |
---|
180 | } |
---|
181 | #else |
---|
182 | data = new unsigned char[data_len]; |
---|
183 | extra_data = data; |
---|
184 | if (data_len) { |
---|
185 | size_t c = data_len; |
---|
186 | unsigned char * p = data; |
---|
187 | while (c) { |
---|
188 | ssize_t n = read(fd, p, c); |
---|
189 | if (n <= 0) { |
---|
190 | if (errno == EINTR) continue; |
---|
191 | data_len = 0; |
---|
192 | // FIXME: do something better. wxGetApp().ReportError(m); |
---|
193 | // We have this message available: Error in format of font file “%s” |
---|
194 | // fprintf(stderr, "Couldn't load extended font.\n"); |
---|
195 | break; |
---|
196 | } |
---|
197 | p += n; |
---|
198 | c -= n; |
---|
199 | } |
---|
200 | } |
---|
201 | #endif |
---|
202 | |
---|
203 | if (fd >= 0) |
---|
204 | close(fd); |
---|
205 | |
---|
206 | extra_chars = new int[0x10000 - BITMAPFONT_MAX_CHAR]; |
---|
207 | |
---|
208 | int ch = 0; |
---|
209 | if (double_size) { |
---|
210 | // The bitmap data will increase 4*, while the metadata will increase |
---|
211 | // 2*, so we can use 4* the total size as an overestimate. |
---|
212 | fontdata_2x_extra = new uint16_t[data_len * 2]; |
---|
213 | uint16_t* out = fontdata_2x_extra; |
---|
214 | int data_ch = 0; |
---|
215 | while (data_ch < data_len) { |
---|
216 | extra_chars[ch++] = out - fontdata_2x_extra; |
---|
217 | unsigned int b = data[data_ch++]; |
---|
218 | *out++ = b; |
---|
219 | unsigned int byte_width = b >> 6; |
---|
220 | if (byte_width) { |
---|
221 | unsigned int start_and_n = data[data_ch++]; |
---|
222 | *out++ = start_and_n; |
---|
223 | unsigned int n = (start_and_n & 15) + 1; |
---|
224 | for (unsigned i = 0; i != n; ++i) { |
---|
225 | for (unsigned j = 0; j != byte_width; ++j) { |
---|
226 | *out++ = tab_2x[data[data_ch++]]; |
---|
227 | if (out - fontdata_2x_extra >= data_len * 2) abort(); |
---|
228 | } |
---|
229 | memcpy(out, out - byte_width, byte_width * sizeof(uint16_t)); |
---|
230 | out += byte_width; |
---|
231 | if (out - fontdata_2x_extra >= data_len * 2) abort(); |
---|
232 | } |
---|
233 | } |
---|
234 | } |
---|
235 | } else { |
---|
236 | int data_ch = 0; |
---|
237 | while (data_ch < data_len) { |
---|
238 | extra_chars[ch++] = data_ch; |
---|
239 | unsigned int byte_width = data[data_ch++]; |
---|
240 | byte_width >>= 6; |
---|
241 | |
---|
242 | if (byte_width) { |
---|
243 | unsigned int start_and_n = data[data_ch]; |
---|
244 | int n = (start_and_n & 15) + 1; |
---|
245 | data_ch += n * byte_width + 1; |
---|
246 | } |
---|
247 | } |
---|
248 | } |
---|
249 | |
---|
250 | while (ch < 0x10000 - BITMAPFONT_MAX_CHAR) { |
---|
251 | extra_chars[ch++] = -1; |
---|
252 | } |
---|
253 | } |
---|
254 | |
---|
255 | int |
---|
256 | BitmapFont::glyph_width(wxChar ch) const |
---|
257 | { |
---|
258 | #if SIZEOF_WXCHAR > 2 |
---|
259 | if (ch >= 0x10000) return 0; |
---|
260 | #endif |
---|
261 | if (!extra_chars) |
---|
262 | init_extra_chars(); |
---|
263 | |
---|
264 | int char_idx = extra_chars[ch - BITMAPFONT_MAX_CHAR]; |
---|
265 | if (char_idx < 0) { |
---|
266 | return tab_2x ? 16 : 8; |
---|
267 | } |
---|
268 | if (tab_2x) { |
---|
269 | unsigned int byte_width = fontdata_2x_extra[char_idx]; |
---|
270 | return ((byte_width & 0x0f) + 2) << 1; |
---|
271 | } else { |
---|
272 | unsigned int byte_width = extra_data[char_idx]; |
---|
273 | return (byte_width & 0x0f) + 2; |
---|
274 | } |
---|
275 | } |
---|
276 | |
---|
277 | void |
---|
278 | BitmapFont::write_glyph(wxChar ch) const |
---|
279 | { |
---|
280 | #if SIZEOF_WXCHAR > 2 |
---|
281 | if (ch >= 0x10000) return; |
---|
282 | #endif |
---|
283 | if (!extra_chars) |
---|
284 | init_extra_chars(); |
---|
285 | |
---|
286 | unsigned int byte_width = 0; |
---|
287 | int start = 0; |
---|
288 | int n = 0; |
---|
289 | int width = 8; |
---|
290 | |
---|
291 | int char_idx = extra_chars[ch - BITMAPFONT_MAX_CHAR]; |
---|
292 | const unsigned char* data = NULL; |
---|
293 | if (char_idx >= 0) { |
---|
294 | if (tab_2x) { |
---|
295 | const uint16_t* p = fontdata_2x_extra + char_idx; |
---|
296 | byte_width = *p++; |
---|
297 | width = (byte_width & 0x0f) + 2; |
---|
298 | byte_width >>= 6; |
---|
299 | |
---|
300 | if (byte_width) { |
---|
301 | byte_width <<= 1; |
---|
302 | unsigned int start_and_n = *p++; |
---|
303 | start = (start_and_n >> 4) << 1; |
---|
304 | n = ((start_and_n & 15) + 1) << 1; |
---|
305 | } |
---|
306 | width <<= 1; |
---|
307 | |
---|
308 | data = reinterpret_cast<const unsigned char*>(p); |
---|
309 | } else { |
---|
310 | const unsigned char * p = extra_data + char_idx; |
---|
311 | byte_width = *p++; |
---|
312 | width = (byte_width & 0x0f) + 2; |
---|
313 | byte_width >>= 6; |
---|
314 | |
---|
315 | if (byte_width) { |
---|
316 | unsigned int start_and_n = *p++; |
---|
317 | start = start_and_n >> 4; |
---|
318 | n = (start_and_n & 15) + 1; |
---|
319 | } |
---|
320 | data = p; |
---|
321 | } |
---|
322 | } |
---|
323 | |
---|
324 | // Even if there's nothing to display, we want to advance the |
---|
325 | // raster position. |
---|
326 | glBitmap(8 * byte_width, n, 0, -start, width, 0, data); |
---|
327 | CHECK_GL_ERROR("BitmapFont::write_glyph", "glBitmap"); |
---|
328 | } |
---|
329 | |
---|
330 | void |
---|
331 | BitmapFont::write_string(const wxChar *s, size_t len) const |
---|
332 | { |
---|
333 | if (!gllist_base) return; |
---|
334 | glListBase(gllist_base); |
---|
335 | #if SIZEOF_WXCHAR == 1 |
---|
336 | call_lists(len, s); |
---|
337 | #elif SIZEOF_WXCHAR == 2 || SIZEOF_WXCHAR == 4 |
---|
338 | while (len) { |
---|
339 | size_t n; |
---|
340 | for (n = 0; n < len; ++n) |
---|
341 | if (int(s[n]) >= BITMAPFONT_MAX_CHAR) |
---|
342 | break; |
---|
343 | call_lists(n, s); |
---|
344 | s += n; |
---|
345 | len -= n; |
---|
346 | while (len && int(*s) >= BITMAPFONT_MAX_CHAR) { |
---|
347 | write_glyph(*s); |
---|
348 | ++s; |
---|
349 | --len; |
---|
350 | } |
---|
351 | } |
---|
352 | #else |
---|
353 | # error "sizeof(wxChar) not 1, 2 or 4" |
---|
354 | #endif |
---|
355 | } |
---|