Mercurial > projects > mde
annotate mde/resource/font.d @ 48:a98ffb64f066
Implemented font rendering (grayscale only; i.e. non-LCD).
FontTexture creates a texture and caches glyphs.
Font supports multiple styles/faces, loaded from config file (should probably be loaded via Options instead).
TextBlock cache for glyph placement within a string.
committer: Diggory Hardy <diggory.hardy@gmail.com>
author | Diggory Hardy <diggory.hardy@gmail.com> |
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date | Sat, 31 May 2008 12:40:26 +0100 |
parents | 0fd51d2c6c8a |
children | bca7e2342d77 |
rev | line source |
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1 /* LICENSE BLOCK |
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2 Part of mde: a Modular D game-oriented Engine |
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3 Copyright © 2007-2008 Diggory Hardy |
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4 |
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5 This program is free software: you can redistribute it and/or modify it under the terms |
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6 of the GNU General Public License as published by the Free Software Foundation, either |
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7 version 2 of the License, or (at your option) any later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; |
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10 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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11 See the GNU General Public License for more details. |
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12 |
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13 You should have received a copy of the GNU General Public License |
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14 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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15 |
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16 /// Sets up freetype (in a basic way). |
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17 module mde.resource.font; |
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18 |
48
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19 import mde.resource.FontTexture; |
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20 import mde.resource.exception; |
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21 |
48
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22 import mde.mergetag.Reader; |
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23 import mde.mergetag.DataSet; |
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24 import mde.mergetag.exception; |
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25 import mde.resource.paths; |
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26 |
44
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27 import derelict.freetype.ft; |
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28 import derelict.opengl.gl; |
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29 |
48
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30 import tango.scrapple.text.convert.parseTo : parseTo; |
44
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31 import tango.stdc.stringz; |
48
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32 import Util = tango.text.Util; |
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33 import tango.util.log.Log : Log, Logger; |
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34 |
48
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35 // "Publically import" this symbol: |
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36 alias mde.resource.FontTexture.TextBlock TextBlock; |
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37 |
44
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38 private Logger logger; |
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39 static this () { |
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40 logger = Log.getLogger ("mde.resource.font"); |
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41 } |
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42 |
48
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43 /** FontStyle class. |
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44 * |
48
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45 * Particular to a font and size, and any other effects like bold/italic if ever implemented. |
45
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46 * |
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47 * Note: it is not currently intended to be thread-safe. */ |
48
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48 class FontStyle : IDataSection |
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49 { |
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50 //BEGIN Static: manager |
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51 static { |
48
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52 debug void drawTexture() { |
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53 if (fontTex !is null) |
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54 fontTex.drawTexture; |
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55 } |
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56 |
48
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57 /** Load the freetype library. */ |
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58 void initialize () { |
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59 if (!confDir.exists (fileName)) |
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60 throw new fontException ("No font settings file (fonts.[mtt|mtb])"); |
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61 |
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62 if (FT_Init_FreeType (&library)) |
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63 throw new fontException ("error initialising the FreeType library"); |
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64 |
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65 // Check version |
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66 FT_Int maj, min, patch; |
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67 FT_Library_Version (library, &maj, &min, &patch); |
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68 if (maj != 2 || min != 3) { |
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69 char[128] tmp; |
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70 logger.warn (logger.format (tmp, "Using an untested FreeType version: {}.{}.{}", maj, min, patch)); |
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71 } |
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72 |
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73 /* Load font settings |
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74 * |
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75 * Each mergetag section corresponds to a font; each is loaded whether used or not |
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76 * (however the actual font files are only loaded on use). A fallback id must be |
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77 * provided in the header which must match a loaded font name; if a non-existant font |
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78 * is requested a warning will be logged and this font returned. */ |
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79 char[] fallbackName; |
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80 try { |
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81 IReader reader; |
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82 reader = confDir.makeMTReader (fileName, PRIORITY.LOW_HIGH, null, true); |
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83 reader.dataSecCreator = delegate IDataSection(ID id) { |
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84 auto f = new FontStyle; |
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85 fonts[id] = f; |
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86 return f; |
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87 }; |
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88 reader.read; |
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89 |
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90 // get fallback name |
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91 char[]* p = "fallback" in reader.dataset.header.Arg!(char[]).Arg; |
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92 if (p is null) |
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93 throw new fontException ("No fallback font style specified"); |
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94 fallbackName = *p; |
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95 } |
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96 catch (MTException e) { |
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97 throw new fontException ("Mergetag exception: "~e.msg); |
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98 } |
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99 |
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100 // Find the fallback |
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101 FontStyle* p = fallbackName in fonts; |
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102 if (p is null) |
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103 throw new fontException ("Fallback font style specified is not found"); |
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104 fallback = *p; |
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105 // Load the fallback now, to ensure it's available. |
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106 // Also note that get() doesn't make sure the fallback is loaded before returning it. |
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107 fallback.load; |
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108 } |
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109 private const fileName = "fonts"; |
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110 |
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111 //FIXME: don't use GC for FontStyle resources |
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112 /** Cleanup: delete all fonts. */ |
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113 void cleanup () { |
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114 FT_Done_FreeType (library); |
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115 } |
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116 |
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117 /** Get a FontStyle instance, for a section in the fonts.mtt file. |
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118 * |
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119 * Also loads the font if it's not already loaded, so the first call may take some time. |
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120 * |
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121 * Uses fallback font-style if the desired style isn't known about or fails to load, so |
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122 * this function should never fail or throw, in theory (unless out of memory). The |
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123 * fallback should already be loaded. */ |
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124 FontStyle get(char[] name) { |
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125 FontStyle* p = name in fonts; |
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126 if (p is null) { |
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127 logger.warn ("Font style "~name~" requested but not found; reverting to the fallback style."); |
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128 fonts[name] = fallback; // set to prevent another warning getting logged |
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129 return fallback; |
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130 } |
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131 // Got it, but we need to make sure it's loaded: |
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132 try { |
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133 p.load; |
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134 } catch (Exception e) { |
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135 logger.warn ("Font style "~name~" failed to load; reverting to the fallback style."); |
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136 return fallback; |
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137 } |
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138 return *p; |
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139 } |
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140 |
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141 private: |
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142 FT_Library library; |
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143 FontTexture fontTex; |
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144 FontStyle[ID] fonts; // all font styles known about; not necessarily loaded |
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145 FontStyle fallback; // used when requested font isn't in fonts |
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146 } |
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147 //END Static |
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148 |
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149 this() {} |
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150 |
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151 //BEGIN Mergetag code |
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152 //NOTE: would it be better not to use a new mergetag file for this? |
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153 //FIXME: revise when gui can set options |
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154 void addTag (char[] tp, ID id, char[] dt) { |
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155 if (tp == "char[]") { |
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156 if (id == "path") |
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157 path = parseTo!(char[]) (dt); |
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158 } |
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159 else if (tp == "int") { |
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160 if (id == "size") |
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161 size = parseTo!(int) (dt); |
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162 } |
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163 } |
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164 void writeAll (ItemDelg) {} // no writing the config for now |
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165 //END Mergetag code |
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166 |
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167 /** Load the font file. |
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168 * |
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169 * Even if the same font is used at multiple sizes, multiple copies of FT_Face are used. |
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170 * Sharing an FT_Face would require calling FT_Set_Pixel_Sizes each time a glyph is rendered or |
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171 * swapping the size information (face.size)? */ |
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172 void load () |
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173 in { |
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174 assert (library !is null, "font: library is null"); |
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175 } body { |
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176 if (FT_New_Face (library, toStringz(path), 0, &face)) |
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177 throw new fontLoadException ("Unable to read font: "~path); |
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178 |
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179 if (!FT_IS_SCALABLE (face)) |
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180 throw new fontLoadException ("Currently no support for non-scalable fonts (which " ~ |
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181 path ~ " is). Please report if you want to see support."); |
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182 /* The following will need to be addressed when adding support for non-scalables: |
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183 * Use of face.size.metrics.height property. |
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184 */ |
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185 |
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186 if (FT_Set_Pixel_Sizes (face, 0,size)) |
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187 throw new fontLoadException ("Unable to set pixel size"); |
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188 |
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189 // Create if necessary: |
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190 if (fontTex is null) |
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191 fontTex = new FontTexture; |
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192 } |
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193 |
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194 /** Update a TextBlock cache, as used by the textBlock function. |
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195 * |
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196 * The only use of this is to get the text block's size ahead of rendering, via TextBlock's w |
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197 * and h properties. |
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198 * |
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199 * This function will only actually update the cache if it is invalid, caused either by the |
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200 * font being changed or if cache.cacheVer < 0. */ |
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201 void updateBlock (char[] str, ref TextBlock cache) { |
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202 fontTex.updateCache (face, str, cache); |
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203 } |
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204 |
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205 /** Draw a block of text (may inlcude new-lines). |
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206 * |
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207 * As a CPU-side code optimisation, store a TextBlock (unique to str) and pass a reference as |
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208 * the cache argument. This is the recommended method, although for one-time calls when you |
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209 * don't need to know the size, the other version of textBlock may be used. |
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210 * --------------------------------- |
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211 * char[] str; |
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212 * TextBlock strCache; |
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213 * textBlock (x, y, str, strCache); |
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214 * --------------------------------- |
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215 * The TextBlock cache will be updated as necessary. Besides the initial update, this will only |
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216 * be if the font changes, or it is manually invalidated. This can be done by setting the |
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217 * TextBlock's cacheVer property to -1, which should be done if str is changed. |
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218 * |
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219 * The TextBlock's w and h properties are set to the size (in pixels) of the text block; other |
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220 * than this cache only serves as a small optimisation. However, the only way to get the size |
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221 * of a text block is to use a TextBlock cache and update it, either with this function or with |
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222 * the updateBlock function. */ |
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223 void textBlock (int x, int y, char[] str, ref TextBlock cache) { |
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224 try { |
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225 fontTex.drawTextCache (face, str, cache, x, y); |
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226 } catch (Exception e) { |
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227 logger.warn ("Exception while drawing text: "~e.msg); |
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228 } |
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229 } |
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230 /** ditto */ |
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231 void textBlock (int x, int y, char[] str) { |
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232 try { |
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233 // Using the cache method for one-time use is slightly less than optimal, but doing so |
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234 // isn't really recommended anyway (and maintaining two versions of fontTex.drawText |
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235 // would be horrible). |
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236 TextBlock cache; |
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237 fontTex.drawTextCache (face, str, cache, x, y); |
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238 } catch (Exception e) { |
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239 logger.warn ("Exception while drawing text: "~e.msg); |
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240 } |
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241 } |
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242 |
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243 |
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244 /** The font-specified vertical distance between the baseline of consecutive lines. */ |
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245 int getLineSeparation () { |
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246 return face.size.metrics.height >> 6; |
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247 } |
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248 |
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249 ~this () { |
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250 FT_Done_Face (face); |
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251 } |
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252 |
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253 private: |
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254 char[] path; // path to font file |
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255 int size; // font size |
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256 |
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257 FT_Face face; |
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258 } |