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BIG commit. Major change: old Options class is gone, all content values are loaded and saved automatically. All options updated to reflect this, some changed. Content restrutured a lot: New IContent module, Content module includes more functionality. New ContentLoader module to manage content loading/saving/translation. Translation module moved to content dir and cut down to reflect current usage. File format unchanged except renames: FontOptions -> Font, VideoOptions -> Screen. Font render mode and LCD filter options are now enums. GUI loading needs to create content (and set type for enums), but doesn't save/load value. Some setup of mainSchedule moved to mde.mainLoop. Content callbacks are called on content change now. ContentLists are set up implicitly from content symbols. Not as fast but much easier! Bug-fix in the new MTTagReader. Renamed MT *Reader maker functions to avoid confusion in paths.d. New mde.setup.logger module to allow logger setup before any other module's static this().
author Diggory Hardy <diggory.hardy@gmail.com>
date Sat, 07 Feb 2009 12:46:03 +0000
parents 7ababdf97748
children
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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.font.font;
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18
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19 public import mde.types.Colour;
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20 import mde.font.FontTexture;
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21 import mde.font.exception;
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22
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23 import mde.setup.exception; // InitStage stuff
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24 import mde.file.paths;
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26 import derelict.freetype.ft;
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27
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28 import tango.stdc.stringz;
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29 import Util = tango.text.Util;
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30 import tango.util.log.Log : Log, Logger;
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32 // "Publically import" this symbol:
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33 alias mde.font.FontTexture.TextBlock TextBlock;
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34
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35 private Logger logger;
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36 static this () {
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37 logger = Log.getLogger ("mde.font.font");
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38 }
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39
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40 /** FontStyle class.
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41 *
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42 * Particular to a font and size, and any other effects like bold/italic if ever implemented.
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43 *
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44 * Note: it is not currently intended to be thread-safe. */
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45 class FontStyle
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46 {
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47 //BEGIN Static: manager
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48 static {
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49 debug (drawGlyphCache) void drawTexture() {
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50 if (fontTex !is null)
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51 fontTex.drawTexture;
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52 }
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53
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54 /** Load the freetype library with settings from options. */
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55 StageState initialize () {
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56 if (FT_Init_FreeType (&library))
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57 throw new fontException ("error initialising the FreeType library");
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58
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59 // Check version
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60 FT_Int maj, min, patch;
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61 FT_Library_Version (library, &maj, &min, &patch);
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62 if (maj != 2 || min != 3) {
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63 logger.warn ("Using an untested FreeType version: {}.{}.{}", maj, min, patch);
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64 logger.info ("The only tested version of freetype is 2.3");
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65 }
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66
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67 // Set LCD filtering method if LCD rendering is enabled.
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68 if (fontOpts.mode() & 2 &&
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69 FT_Library_SetLcdFilter(library, cast(FT_LcdFilter)fontOpts.lcdFilter())) {
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70 /* An error occurred, presumably because LCD rendering support
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71 * is not compiled into the library. */
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72 logger.warn ("Bad/unsupported LCD filter option; disabling LCD font rendering.");
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73 logger.warn ("Your FreeType 2 library may be compiled without support for LCD/sub-pixel rendering.");
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74
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75 // Reset the default filter (in case an invalid value was set in config files).
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76 fontOpts.lcdFilter = FT_LcdFilter.FT_LCD_FILTER_DEFAULT;
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77
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78 /* If no support for LCD filtering, then LCD rendering only emulates NORMAL with 3
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79 * times wider glyphs. So disable and save the extra work. */
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80 fontOpts.mode = 0;
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81 }
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83 // Load the fallback font; if it throws let exception abort program
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84 fallback = new FontStyle (fontOpts.defaultFont(), fontOpts.defaultSize());
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85
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86 return StageState.ACTIVE;
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87 }
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89 /** Cleanup: delete all fonts. */
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90 StageState cleanup () {
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91 // Clear loaded fonts (each has an FT_Face object needing to be freed):
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92 /* FIXME
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93 foreach (fs; fonts)
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94 fs.freeFace;
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95 */
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97 FT_Done_FreeType (library); // free the library
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99 return StageState.INACTIVE;
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100 }
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101
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102 /** Get a FontStyle instance, for a section in the fonts.mtt file.
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103 *
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104 * Also loads the font if it's not already loaded, so the first call may take some time.
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105 *
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106 * Uses fallback font-style if the desired style isn't known about or fails to load, so
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107 * this function should never fail or throw, in theory (unless out of memory). The
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108 * fallback should already be loaded. */
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109 FontStyle getDefault () {
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110 //FIXME: Ddoc, new purpose; rename
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111 return fallback;
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112 }
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113
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114 private:
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115 FT_Library library;
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116 FontTexture fontTex;
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117 //FontStyle[char[]] fonts; // loaded fonts, by file name FIXME: use hash of struct { char[] path; int size; }?
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118 FontStyle fallback; // default & used when requested font can't be loaded
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119 }
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120 //END Static
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121
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122 /** Load the font file.
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123 *
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124 * Even if the same font is used at multiple sizes, multiple copies of FT_Face are used.
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125 * Sharing an FT_Face would require calling FT_Set_Pixel_Sizes each time a glyph is rendered or
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126 * swapping the size information (face.size)? */
101
71f0f1f83620 Some path adjustments for windows (untested) and fonts. All types of option can be edited.
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diff changeset
127 this (char[] file, int size)
44
07bd1a09e161 Started implementing text rendering.
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parents:
diff changeset
128 in {
07bd1a09e161 Started implementing text rendering.
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parents:
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129 assert (library !is null, "font: library is null");
07bd1a09e161 Started implementing text rendering.
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parents:
diff changeset
130 } body {
101
71f0f1f83620 Some path adjustments for windows (untested) and fonts. All types of option can be edited.
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diff changeset
131 if (FT_New_Face (library, getFontPath (file).ptr, 0, &face))
71f0f1f83620 Some path adjustments for windows (untested) and fonts. All types of option can be edited.
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diff changeset
132 throw new fontLoadException ("Unable to read font: "~file[0..$-1]);
44
07bd1a09e161 Started implementing text rendering.
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parents:
diff changeset
133
48
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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diff changeset
134 if (!FT_IS_SCALABLE (face))
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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diff changeset
135 throw new fontLoadException ("Currently no support for non-scalable fonts (which " ~
101
71f0f1f83620 Some path adjustments for windows (untested) and fonts. All types of option can be edited.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 100
diff changeset
136 file[0..$-1] ~ " is). Please report if you want to see support.");
48
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
137 /* The following will need to be addressed when adding support for non-scalables:
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
138 * Use of face.size.metrics.height property.
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
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diff changeset
139 */
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
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diff changeset
140
100
0ea4a3e651ae There is now a position marker for text editing.
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diff changeset
141 if (FT_Set_Pixel_Sizes (face, 0, size))
44
07bd1a09e161 Started implementing text rendering.
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parents:
diff changeset
142 throw new fontLoadException ("Unable to set pixel size");
48
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
143
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
144 // Create if necessary:
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
145 if (fontTex is null)
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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diff changeset
146 fontTex = new FontTexture;
100
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diff changeset
147
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diff changeset
148 return this;
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diff changeset
149 }
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diff changeset
150
0ea4a3e651ae There is now a position marker for text editing.
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diff changeset
151 this (FontStyle font, int size) {
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diff changeset
152 //FIXME: copy font's face and set new size?
48
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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diff changeset
153 }
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
154
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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diff changeset
155 /** Update a TextBlock cache, as used by the textBlock function.
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
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diff changeset
156 *
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
157 * The only use of this is to get the text block's size ahead of rendering, via TextBlock's w
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
158 * and h properties.
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parents: 45
diff changeset
159 *
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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diff changeset
160 * This function will only actually update the cache if it is invalid, caused either by the
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
161 * font being changed or if cache.cacheVer < 0. */
86
79d816b3e2d2 New InitStage system, Screen & Screen.Drawable, separate testing and guiDemo binaries.
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parents: 85
diff changeset
162 void updateBlock (char[] str, ref TextBlock cache)
79d816b3e2d2 New InitStage system, Screen & Screen.Drawable, separate testing and guiDemo binaries.
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parents: 85
diff changeset
163 in {
79d816b3e2d2 New InitStage system, Screen & Screen.Drawable, separate testing and guiDemo binaries.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 85
diff changeset
164 debug assert (face, "FontStyle: face is null");
79d816b3e2d2 New InitStage system, Screen & Screen.Drawable, separate testing and guiDemo binaries.
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diff changeset
165 } body {
51
387a80724c35 Enabled LCD font rendering mode (only tested with freetype's sub-pixel rendering disabled).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 50
diff changeset
166 try {
387a80724c35 Enabled LCD font rendering mode (only tested with freetype's sub-pixel rendering disabled).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 50
diff changeset
167 fontTex.updateCache (face, str, cache);
387a80724c35 Enabled LCD font rendering mode (only tested with freetype's sub-pixel rendering disabled).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 50
diff changeset
168 } catch (Exception e) {
387a80724c35 Enabled LCD font rendering mode (only tested with freetype's sub-pixel rendering disabled).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 50
diff changeset
169 logger.warn ("Exception while drawing text: "~e.msg);
387a80724c35 Enabled LCD font rendering mode (only tested with freetype's sub-pixel rendering disabled).
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diff changeset
170 }
44
07bd1a09e161 Started implementing text rendering.
Diggory Hardy <diggory.hardy@gmail.com>
parents:
diff changeset
171 }
07bd1a09e161 Started implementing text rendering.
Diggory Hardy <diggory.hardy@gmail.com>
parents:
diff changeset
172
48
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
173 /** Draw a block of text (may inlcude new-lines).
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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diff changeset
174 *
100
0ea4a3e651ae There is now a position marker for text editing.
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diff changeset
175 * Params:
0ea4a3e651ae There is now a position marker for text editing.
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diff changeset
176 * x = Top left x-coordinate of text block
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diff changeset
177 * y = Top left y-coordinate of text block
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diff changeset
178 * str = Text to render
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diff changeset
179 * cache = An (optional) TextBlock used for rendering this text, to save some CPU work. See updateBlock
0ea4a3e651ae There is now a position marker for text editing.
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diff changeset
180 * col = Colour to render the text; see mde.types.Colour
0ea4a3e651ae There is now a position marker for text editing.
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parents: 98
diff changeset
181 * index = Either the index of the character to draw with an edit cursor or size_t.max. Not
0ea4a3e651ae There is now a position marker for text editing.
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parents: 98
diff changeset
182 * the index within str, but the number of characters, excluding new-lines.
49
bca7e2342d77 Enabled getting the size of a text block (before or after rendering).
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parents: 48
diff changeset
183 * The text block is drawn with top-left corner at x,y. To put the text's baseline at a given
100
0ea4a3e651ae There is now a position marker for text editing.
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parents: 98
diff changeset
184 * y coordinate would require some changes. Line height is fixed (see getLineSeparation).
89
97e6dce08037 Solved some/removed some obsolete jobs/FIXMEs (excluding from gui code). General cleanup.
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parents: 86
diff changeset
185 * Due to hinter, glyphs are not guaranteed to lie within the "bounding box" defined by cache.
97e6dce08037 Solved some/removed some obsolete jobs/FIXMEs (excluding from gui code). General cleanup.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 86
diff changeset
186 * Can be changed to test size of each glyph if necessary.
57
9e1f05fbbcef Coloured and alpha-blended text is now supported.
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parents: 53
diff changeset
187 *
89
97e6dce08037 Solved some/removed some obsolete jobs/FIXMEs (excluding from gui code). General cleanup.
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parents: 86
diff changeset
188 * Specify the text's colour with col. Use textBlockA() instead for transparent text.
49
bca7e2342d77 Enabled getting the size of a text block (before or after rendering).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 48
diff changeset
189 *
48
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
190 * As a CPU-side code optimisation, store a TextBlock (unique to str) and pass a reference as
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
191 * the cache argument. This is the recommended method, although for one-time calls when you
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
192 * don't need to know the size, the other version of textBlock may be used.
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diff changeset
193 * ---------------------------------
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diff changeset
194 * char[] str;
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diff changeset
195 * TextBlock strCache;
100
0ea4a3e651ae There is now a position marker for text editing.
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diff changeset
196 * textBlock (x, y, str, strCache, Colour.WHITE);
48
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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diff changeset
197 * ---------------------------------
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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diff changeset
198 * The TextBlock cache will be updated as necessary. Besides the initial update, this will only
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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diff changeset
199 * be if the font changes, or it is manually invalidated. This can be done by setting the
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
200 * TextBlock's cacheVer property to -1, which should be done if str is changed.
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
201 *
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
202 * The TextBlock's w and h properties are set to the size (in pixels) of the text block; other
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
203 * than this cache only serves as a small optimisation. However, the only way to get the size
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
204 * of a text block is to use a TextBlock cache and update it, either with this function or with
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
205 * the updateBlock function. */
100
0ea4a3e651ae There is now a position marker for text editing.
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parents: 98
diff changeset
206 void textBlock (int x, int y, char[] str, ref TextBlock cache, Colour col, size_t index = size_t.max)
86
79d816b3e2d2 New InitStage system, Screen & Screen.Drawable, separate testing and guiDemo binaries.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 85
diff changeset
207 in {
89
97e6dce08037 Solved some/removed some obsolete jobs/FIXMEs (excluding from gui code). General cleanup.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 86
diff changeset
208 assert (face, "FontStyle: face is null");
86
79d816b3e2d2 New InitStage system, Screen & Screen.Drawable, separate testing and guiDemo binaries.
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parents: 85
diff changeset
209 } body {
48
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
210 try {
100
0ea4a3e651ae There is now a position marker for text editing.
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parents: 98
diff changeset
211 fontTex.drawCache (face, str, cache, x, y, col, index);
48
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
212 } catch (Exception e) {
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
213 logger.warn ("Exception while drawing text: "~e.msg);
44
07bd1a09e161 Started implementing text rendering.
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parents:
diff changeset
214 }
07bd1a09e161 Started implementing text rendering.
Diggory Hardy <diggory.hardy@gmail.com>
parents:
diff changeset
215 }
48
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
216 /** ditto */
100
0ea4a3e651ae There is now a position marker for text editing.
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parents: 98
diff changeset
217 void textBlock (int x, int y, char[] str, Colour col, size_t index = size_t.max)
86
79d816b3e2d2 New InitStage system, Screen & Screen.Drawable, separate testing and guiDemo binaries.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 85
diff changeset
218 in {
89
97e6dce08037 Solved some/removed some obsolete jobs/FIXMEs (excluding from gui code). General cleanup.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 86
diff changeset
219 assert (face, "FontStyle: face is null");
86
79d816b3e2d2 New InitStage system, Screen & Screen.Drawable, separate testing and guiDemo binaries.
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parents: 85
diff changeset
220 } body {
48
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
221 try {
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
222 // Using the cache method for one-time use is slightly less than optimal, but doing so
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
223 // isn't really recommended anyway (and maintaining two versions of fontTex.drawText
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
224 // would be horrible).
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
225 TextBlock cache;
100
0ea4a3e651ae There is now a position marker for text editing.
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parents: 98
diff changeset
226 fontTex.drawCache (face, str, cache, x, y, col, index);
48
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
227 } catch (Exception e) {
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
228 logger.warn ("Exception while drawing text: "~e.msg);
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
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parents: 45
diff changeset
229 }
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
230 }
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
diff changeset
231
57
9e1f05fbbcef Coloured and alpha-blended text is now supported.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 53
diff changeset
232 /** A variation of textBlock for transparency.
9e1f05fbbcef Coloured and alpha-blended text is now supported.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 53
diff changeset
233 *
9e1f05fbbcef Coloured and alpha-blended text is now supported.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 53
diff changeset
234 * Set the alpha by calling glColor*() first. See FontTexture.drawCacheA()'s documentation for
9e1f05fbbcef Coloured and alpha-blended text is now supported.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 53
diff changeset
235 * details. */
100
0ea4a3e651ae There is now a position marker for text editing.
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parents: 98
diff changeset
236 void textBlockA (int x, int y, char[] str, ref TextBlock cache, Colour col, size_t index = size_t.max)
86
79d816b3e2d2 New InitStage system, Screen & Screen.Drawable, separate testing and guiDemo binaries.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 85
diff changeset
237 in {
89
97e6dce08037 Solved some/removed some obsolete jobs/FIXMEs (excluding from gui code). General cleanup.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 86
diff changeset
238 assert (face, "FontStyle: face is null");
86
79d816b3e2d2 New InitStage system, Screen & Screen.Drawable, separate testing and guiDemo binaries.
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parents: 85
diff changeset
239 } body {
57
9e1f05fbbcef Coloured and alpha-blended text is now supported.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 53
diff changeset
240 try {
100
0ea4a3e651ae There is now a position marker for text editing.
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parents: 98
diff changeset
241 fontTex.drawCacheA (face, str, cache, x, y, col, index);
57
9e1f05fbbcef Coloured and alpha-blended text is now supported.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 53
diff changeset
242 } catch (Exception e) {
9e1f05fbbcef Coloured and alpha-blended text is now supported.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 53
diff changeset
243 logger.warn ("Exception while drawing text: "~e.msg);
9e1f05fbbcef Coloured and alpha-blended text is now supported.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 53
diff changeset
244 }
9e1f05fbbcef Coloured and alpha-blended text is now supported.
Diggory Hardy <diggory.hardy@gmail.com>
parents: 53
diff changeset
245 }
48
a98ffb64f066 Implemented font rendering (grayscale only; i.e. non-LCD).
Diggory Hardy <diggory.hardy@gmail.com>
parents: 45
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246
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247 /** The font-specified vertical distance between the baseline of consecutive lines. */
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248 int getLineSeparation ()
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249 in {
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250 assert (face, "FontStyle: face is null");
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251 } body {
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252 return face.size.metrics.height >> 6;
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253 }
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254
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255 void freeFace () {
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256 FT_Done_Face (face);
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257 face = null; // functions using face use assertions on face to check its validity.
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258 }
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259
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260 private:
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261 FT_Face face;
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262 }