1 | // |
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2 | // glbitmapfont.cc |
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3 | // |
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4 | // Draw text using glBitmap. |
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5 | // |
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6 | // Copyright (C) 2011,2012,2013,2014,2015 Olly Betts |
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7 | // |
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8 | // This program is free software; you can redistribute it and/or modify |
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9 | // it under the terms of the GNU General Public License as published by |
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10 | // the Free Software Foundation; either version 2 of the License, or |
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11 | // (at your option) any later version. |
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12 | // |
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13 | // This program is distributed in the hope that it will be useful, |
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14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | // GNU General Public License for more details. |
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17 | // |
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18 | // You should have received a copy of the GNU General Public License |
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19 | // along with this program; if not, write to the Free Software |
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20 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | // |
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22 | |
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23 | #ifdef HAVE_CONFIG_H |
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24 | #include <config.h> |
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25 | #endif |
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26 | |
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27 | #include "glbitmapfont.h" |
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28 | |
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29 | #include "aventypes.h" |
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30 | #include "useful.h" |
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31 | #include "wx.h" |
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32 | |
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33 | #include <cerrno> |
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34 | #ifdef HAVE_MMAP |
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35 | #include <sys/mman.h> |
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36 | #else |
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37 | #include <unistd.h> |
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38 | #endif |
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39 | |
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40 | using namespace std; |
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41 | |
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42 | #include "../lib/preload_font.h" |
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43 | |
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44 | #define CHECK_GL_ERROR(M, F) do { \ |
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45 | GLenum error_code_ = glGetError(); \ |
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46 | if (error_code_ != GL_NO_ERROR) { \ |
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47 | wxLogError(wxT(__FILE__ ":" STRING(__LINE__) ": OpenGL error: %s " \ |
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48 | "(call " F " in method " M ")"), \ |
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49 | wxString((const char *)gluErrorString(error_code_), \ |
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50 | wxConvUTF8).c_str()); \ |
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51 | } \ |
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52 | } while (0) |
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53 | |
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54 | bool |
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55 | BitmapFont::load(const wxString & font_file_) |
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56 | { |
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57 | font_file = font_file_; |
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58 | |
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59 | if (!gllist_base) { |
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60 | gllist_base = glGenLists(BITMAPFONT_MAX_CHAR); |
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61 | } |
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62 | |
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63 | const unsigned char * p = fontdata_preloaded; |
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64 | const unsigned char * end = p + sizeof(fontdata_preloaded); |
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65 | for (int ch = 0; ch < BITMAPFONT_MAX_CHAR; ++ch) { |
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66 | glNewList(gllist_base + ch, GL_COMPILE); |
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67 | CHECK_GL_ERROR("BitmapFont::load", "glNewList"); |
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68 | if (p == end) { |
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69 | return false; |
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70 | } |
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71 | unsigned int byte_width = *p++; |
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72 | |
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73 | char_width[ch] = (byte_width & 0x0f) + 2; |
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74 | byte_width >>= 6; |
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75 | |
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76 | int start = 0; |
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77 | unsigned int n = 0; |
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78 | if (byte_width) { |
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79 | if (p == end) { |
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80 | return false; |
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81 | } |
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82 | unsigned int start_and_n = *p++; |
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83 | start = start_and_n >> 4; |
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84 | n = (start_and_n & 15) + 1; |
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85 | |
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86 | if (unsigned(end - p) < n * byte_width) { |
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87 | return false; |
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88 | } |
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89 | } |
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90 | |
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91 | // Even if there's nothing to display, we want to advance the |
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92 | // raster position. |
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93 | glBitmap(8 * byte_width, n, 0, -start, char_width[ch], 0, p); |
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94 | CHECK_GL_ERROR("BitmapFont::load", "glBitmap"); |
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95 | glEndList(); |
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96 | CHECK_GL_ERROR("BitmapFont::load", "glEndList"); |
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97 | |
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98 | p += n * byte_width; |
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99 | } |
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100 | |
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101 | return true; |
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102 | } |
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103 | |
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104 | inline void call_lists(GLsizei n, const GLvoid * lists) |
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105 | { |
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106 | #if SIZEOF_WXCHAR == 1 |
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107 | glCallLists(n, GL_UNSIGNED_BYTE, lists); |
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108 | #elif SIZEOF_WXCHAR == 2 |
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109 | glCallLists(n, GL_UNSIGNED_SHORT, lists); |
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110 | #elif SIZEOF_WXCHAR == 4 |
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111 | glCallLists(n, GL_UNSIGNED_INT, lists); |
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112 | #else |
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113 | # error "sizeof(wxChar) not 1, 2 or 4" |
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114 | #endif |
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115 | } |
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116 | |
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117 | void |
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118 | BitmapFont::init_extra_chars() const |
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119 | { |
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120 | int fd = wxOpen(font_file, |
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121 | #ifdef __WXMSW__ |
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122 | _O_RDONLY|_O_SEQUENTIAL|_O_BINARY, |
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123 | #else |
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124 | O_RDONLY, |
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125 | #endif |
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126 | 0); |
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127 | |
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128 | int data_len = 0; |
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129 | unsigned char * data = NULL; |
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130 | if (fd >= 0) { |
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131 | struct stat sb; |
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132 | if (fstat(fd, &sb) >= 0) { |
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133 | data_len = sb.st_size; |
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134 | } |
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135 | } |
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136 | |
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137 | #if HAVE_MMAP |
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138 | if (data_len) { |
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139 | void * p = mmap(NULL, data_len, PROT_READ, MAP_SHARED, fd, 0); |
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140 | if (p == MAP_FAILED) { |
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141 | data_len = 0; |
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142 | } else { |
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143 | extra_data = data = static_cast<unsigned char*>(p); |
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144 | } |
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145 | } |
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146 | #else |
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147 | data = new unsigned char[data_len]; |
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148 | extra_data = data; |
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149 | if (data_len) { |
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150 | size_t c = data_len; |
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151 | unsigned char * p = data; |
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152 | while (c) { |
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153 | ssize_t n = read(fd, p, c); |
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154 | if (n <= 0) { |
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155 | if (errno == EINTR) continue; |
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156 | data_len = 0; |
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157 | // FIXME: do something better. wxGetApp().ReportError(m); |
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158 | // We have this message available: Error in format of font file “%s” |
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159 | // fprintf(stderr, "Couldn't load extended font.\n"); |
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160 | break; |
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161 | } |
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162 | p += n; |
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163 | c -= n; |
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164 | } |
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165 | } |
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166 | #endif |
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167 | |
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168 | if (fd >= 0) |
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169 | close(fd); |
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170 | |
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171 | extra_chars = new int[0x10000 - BITMAPFONT_MAX_CHAR]; |
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172 | int data_ch = 0; |
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173 | for (int i = 0; i < 0x10000 - BITMAPFONT_MAX_CHAR; ++i) { |
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174 | if (data_ch >= data_len) { |
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175 | extra_chars[i] = -1; |
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176 | continue; |
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177 | } |
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178 | extra_chars[i] = data_ch; |
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179 | unsigned int byte_width = data[data_ch++]; |
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180 | byte_width >>= 6; |
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181 | |
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182 | if (byte_width) { |
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183 | unsigned int start_and_n = data[data_ch]; |
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184 | int n = (start_and_n & 15) + 1; |
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185 | data_ch += n * byte_width + 1; |
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186 | } |
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187 | } |
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188 | } |
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189 | |
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190 | int |
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191 | BitmapFont::glyph_width(wxChar ch) const |
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192 | { |
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193 | #if SIZEOF_WXCHAR > 2 |
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194 | if (ch >= 0x10000) return 0; |
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195 | #endif |
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196 | if (!extra_chars) |
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197 | init_extra_chars(); |
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198 | |
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199 | int width = 8; |
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200 | |
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201 | int char_idx = extra_chars[ch - BITMAPFONT_MAX_CHAR]; |
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202 | if (char_idx >= 0) { |
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203 | unsigned int byte_width = extra_data[char_idx]; |
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204 | width = (byte_width & 0x0f) + 2; |
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205 | } |
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206 | |
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207 | return width; |
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208 | } |
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209 | |
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210 | void |
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211 | BitmapFont::write_glyph(wxChar ch) const |
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212 | { |
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213 | #if SIZEOF_WXCHAR > 2 |
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214 | if (ch >= 0x10000) return; |
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215 | #endif |
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216 | if (!extra_chars) |
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217 | init_extra_chars(); |
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218 | |
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219 | unsigned int byte_width = 0; |
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220 | int start = 0; |
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221 | int n = 0; |
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222 | int width = 8; |
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223 | |
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224 | int char_idx = extra_chars[ch - BITMAPFONT_MAX_CHAR]; |
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225 | const unsigned char * p = extra_data; |
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226 | if (char_idx >= 0) { |
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227 | p += char_idx; |
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228 | byte_width = *p++; |
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229 | width = (byte_width & 0x0f) + 2; |
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230 | byte_width >>= 6; |
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231 | |
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232 | if (byte_width) { |
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233 | unsigned int start_and_n = *p++; |
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234 | start = start_and_n >> 4; |
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235 | n = (start_and_n & 15) + 1; |
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236 | } |
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237 | } |
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238 | |
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239 | // Even if there's nothing to display, we want to advance the |
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240 | // raster position. |
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241 | glBitmap(8 * byte_width, n, 0, -start, width, 0, p); |
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242 | CHECK_GL_ERROR("BitmapFont::write_glyph", "glBitmap"); |
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243 | } |
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244 | |
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245 | void |
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246 | BitmapFont::write_string(const wxChar *s, size_t len) const |
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247 | { |
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248 | if (!gllist_base) return; |
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249 | glListBase(gllist_base); |
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250 | #if SIZEOF_WXCHAR == 1 |
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251 | call_lists(len, s); |
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252 | #elif SIZEOF_WXCHAR == 2 || SIZEOF_WXCHAR == 4 |
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253 | while (len) { |
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254 | size_t n; |
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255 | for (n = 0; n < len; ++n) |
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256 | if (int(s[n]) >= BITMAPFONT_MAX_CHAR) |
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257 | break; |
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258 | call_lists(n, s); |
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259 | s += n; |
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260 | len -= n; |
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261 | while (len && int(*s) >= BITMAPFONT_MAX_CHAR) { |
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262 | write_glyph(*s); |
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263 | ++s; |
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264 | --len; |
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265 | } |
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266 | } |
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267 | #else |
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268 | # error "sizeof(wxChar) not 1, 2 or 4" |
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269 | #endif |
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270 | } |
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