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 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 | #define CHECK_GL_ERROR(M, F) do { \ |
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34 | GLenum error_code_ = glGetError(); \ |
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35 | if (error_code_ != GL_NO_ERROR) { \ |
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36 | wxLogError(wxT(__FILE__":"STRING(__LINE__)": OpenGL error: %s " \ |
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37 | "(call "F" in method "M")"), \ |
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38 | wxString((const char *)gluErrorString(error_code_), \ |
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39 | wxConvUTF8).c_str()); \ |
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40 | } \ |
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41 | } while (0) |
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42 | |
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43 | bool |
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44 | BitmapFont::load(const wxString & font_file) |
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45 | { |
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46 | if (fh) fclose(fh); |
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47 | #ifdef __WXMSW__ |
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48 | fh = _wfopen(font_file.fn_str(), L"rb"); |
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49 | #else |
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50 | fh = fopen(font_file.mb_str(), "rb"); |
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51 | #endif |
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52 | |
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53 | if (!fh) { |
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54 | return false; |
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55 | } |
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56 | |
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57 | if (!gllist_base) { |
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58 | gllist_base = glGenLists(BITMAPFONT_MAX_CHAR); |
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59 | } |
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60 | |
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61 | unsigned char buf[32]; |
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62 | |
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63 | for (int ch = 0; ch < BITMAPFONT_MAX_CHAR; ++ch) { |
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64 | glNewList(gllist_base + ch, GL_COMPILE); |
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65 | CHECK_GL_ERROR("BitmapFont::load", "glNewList"); |
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66 | int b = GETC(fh); |
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67 | if (b == EOF) { |
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68 | fclose(fh); |
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69 | return false; |
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70 | } |
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71 | unsigned int byte_width = b; |
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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 | int n = 0; |
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78 | if (byte_width) { |
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79 | b = GETC(fh); |
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80 | if (b == EOF) { |
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81 | fclose(fh); |
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82 | return false; |
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83 | } |
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84 | unsigned int start_and_n = b; |
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85 | start = start_and_n >> 4; |
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86 | n = (start_and_n & 15) + 1; |
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87 | if (fread(buf, n * byte_width, 1, fh) != 1) { |
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88 | fclose(fh); |
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89 | return false; |
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90 | } |
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91 | } |
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92 | |
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93 | // Even if there's nothing to display, we want to advance the |
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94 | // raster position. |
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95 | glBitmap(8 * byte_width, n, 0, -start, char_width[ch], 0, buf); |
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96 | CHECK_GL_ERROR("BitmapFont::load", "glBitmap"); |
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97 | glEndList(); |
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98 | CHECK_GL_ERROR("BitmapFont::load", "glEndList"); |
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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 | long here = ftell(fh); |
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121 | if (here == -1 || fseek(fh, 0, SEEK_END) < 0) |
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122 | return; |
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123 | long data_len = ftell(fh); |
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124 | if (data_len == -1) |
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125 | return; |
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126 | data_len -= here; |
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127 | unsigned char * data = new unsigned char [data_len]; |
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128 | if (fseek(fh, here, SEEK_SET) < 0 || |
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129 | fread(data, data_len, 1, fh) != 1) { |
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130 | delete data; |
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131 | return; |
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132 | } |
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133 | extra_chars = new unsigned char * [0x10000 - BITMAPFONT_MAX_CHAR]; |
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134 | |
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135 | for (int i = 0; i < 0x10000 - BITMAPFONT_MAX_CHAR; ++i) { |
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136 | if (data_len <= 0) { |
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137 | extra_chars[i] = NULL; |
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138 | continue; |
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139 | } |
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140 | extra_chars[i] = data; |
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141 | unsigned int byte_width = *data++; |
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142 | byte_width >>= 6; |
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143 | |
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144 | if (byte_width) { |
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145 | unsigned int start_and_n = *data; |
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146 | int n = (start_and_n & 15) + 1; |
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147 | data += n * byte_width + 1; |
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148 | data_len -= n * byte_width + 1; |
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149 | } |
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150 | } |
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151 | fclose(fh); |
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152 | fh = NULL; |
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153 | } |
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154 | |
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155 | int |
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156 | BitmapFont::glyph_width(wxChar ch) const |
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157 | { |
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158 | #if SIZEOF_WXCHAR > 2 |
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159 | if (ch >= 0x10000) return 0; |
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160 | #endif |
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161 | if (!extra_chars) |
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162 | init_extra_chars(); |
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163 | |
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164 | unsigned int byte_width = 0; |
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165 | int width = 8; |
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166 | |
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167 | const unsigned char * p = extra_chars[ch - BITMAPFONT_MAX_CHAR]; |
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168 | if (p) { |
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169 | byte_width = *p++; |
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170 | width = (byte_width & 0x0f) + 2; |
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171 | } |
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172 | |
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173 | return width; |
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174 | } |
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175 | |
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176 | void |
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177 | BitmapFont::write_glyph(wxChar ch) const |
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178 | { |
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179 | #if SIZEOF_WXCHAR > 2 |
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180 | if (ch >= 0x10000) return; |
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181 | #endif |
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182 | if (!extra_chars) |
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183 | init_extra_chars(); |
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184 | |
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185 | unsigned int byte_width = 0; |
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186 | int start = 0; |
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187 | int n = 0; |
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188 | int width = 8; |
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189 | |
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190 | const unsigned char * p = extra_chars[ch - BITMAPFONT_MAX_CHAR]; |
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191 | if (p) { |
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192 | byte_width = *p++; |
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193 | width = (byte_width & 0x0f) + 2; |
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194 | byte_width >>= 6; |
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195 | |
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196 | if (byte_width) { |
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197 | unsigned int start_and_n = *p++; |
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198 | start = start_and_n >> 4; |
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199 | n = (start_and_n & 15) + 1; |
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200 | } |
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201 | } |
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202 | |
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203 | // Even if there's nothing to display, we want to advance the |
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204 | // raster position. |
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205 | glBitmap(8 * byte_width, n, 0, -start, width, 0, p); |
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206 | } |
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207 | |
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208 | void |
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209 | BitmapFont::write_string(const wxChar *s, size_t len) const |
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210 | { |
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211 | if (!gllist_base) return; |
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212 | glListBase(gllist_base); |
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213 | #if SIZEOF_WXCHAR == 1 |
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214 | call_lists(len, s); |
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215 | #elif SIZEOF_WXCHAR == 2 || SIZEOF_WXCHAR == 4 |
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216 | while (len) { |
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217 | size_t n; |
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218 | for (n = 0; n < len; ++n) |
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219 | if (int(s[n]) >= BITMAPFONT_MAX_CHAR) |
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220 | break; |
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221 | call_lists(n, s); |
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222 | s += n; |
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223 | len -= n; |
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224 | while (len && int(*s) >= BITMAPFONT_MAX_CHAR) { |
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225 | write_glyph(*s); |
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226 | ++s; |
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227 | --len; |
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228 | } |
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229 | } |
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230 | #else |
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231 | # error "sizeof(wxChar) not 1, 2 or 4" |
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232 | #endif |
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233 | } |
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