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annotate mde/resource/font.d @ 44:07bd1a09e161

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Started implementing text rendering. Can now position glyphs accurately and render them, in a very basic way. A basic TextWidget. committer: Diggory Hardy <diggory.hardy@gmail.com>
author Diggory Hardy <diggory.hardy@gmail.com>
date Fri, 16 May 2008 12:22:10 +0100
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children 0fd51d2c6c8a
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44
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Diggory Hardy <diggory.hardy@gmail.com>
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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
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19 import mde.resource.exception;
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20
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21 import derelict.freetype.ft;
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22 import derelict.opengl.gl;
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23
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24 import tango.stdc.stringz;
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25 import tango.util.log.Log : Log, Logger;
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26
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27 private Logger logger;
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28 static this () {
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29 logger = Log.getLogger ("mde.resource.font");
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30 }
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31
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32 /** Font class.
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33 *
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34 * Particular to a font and size. (Maybe not size?) */
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35 class Font
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36 {
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37 //BEGIN Static: manager
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38 static {
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39 /** Load the freetype library. */
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40 void initialize () {
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41 if (FT_Init_FreeType (&library))
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42 throw new fontException ("error initialising the FreeType library");
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43 }
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44
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45 //FIXME: don't use GC for Font resources
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46 /** Cleanup: delete all fonts. */
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47 void cleanup () {
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48 if (font)
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49 delete font;
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50
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51 FT_Done_FreeType (library);
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52 }
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53
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54 /** Get a font.
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55 *
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56 * Later specify font/size.
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57 *
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58 * Throws:
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59 * fontLoadException when unable to load the font. */
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60 Font get(char[] path) {
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61 if (font is null) font = new Font(path);
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62 return font;
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63 }
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64
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65 private:
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66 FT_Library library;
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67 Font font;
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68 }
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69 //END Static
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70
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71
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72 /** Load & cache a new font. */
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73 this (char[] path)
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74 in {
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75 assert (library !is null, "font: library is null");
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76 } body {
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77 if (FT_New_Face (library, toStringz(path), 0, &face))
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78 throw new fontLoadException ("Unable to read font: "~path);
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79
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80 if (FT_Set_Pixel_Sizes (face, 12,12))
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81 throw new fontLoadException ("Unable to set pixel size");
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82 }
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83
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84 void drawStr (int x, int y, char[] str) {
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85 FT_Vector pen = { x*64, y*64 };
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86 auto g = face.glyph;
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87
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88 FT_Matrix m;
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89 m.xx = 0x10000;
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90 m.xy = m.yx = 0;
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91 m.yy = -0x10000;
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92
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93 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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94
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95 FT_Pos y_adj = 0; // y adjustment (for height)
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96
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97 foreach (chr; str) {
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98 FT_Set_Transform(face, &m, &pen);
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99 if (FT_Load_Char(face, chr, FT_LOAD_RENDER))
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100 return; // give up
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101
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102 if (y_adj < g.metrics.height) y_adj = g.metrics.height;
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103
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104 auto b = g.bitmap;
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105 if (b.pixel_mode != FT_Pixel_Mode.FT_PIXEL_MODE_GRAY || b.num_grays != 256) {
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106 char[128] tmp;
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107 logger.warn (logger.format (tmp,"Unsupported freetype bitmap format: {}, {}", b.pixel_mode, b.num_grays));
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108 return;
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109 }
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110 if (b.pitch != b.width)
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111 logger.info ("b.pitch != b.width");
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112
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113 //NOTE: y direction!
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114 glRasterPos2i (g.bitmap_left,g.bitmap_top + y_adj/64);
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115 glDrawPixels (b.width, b.rows, GL_LUMINANCE, GL_UNSIGNED_BYTE, cast(void*) b.buffer);
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116
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117 pen.x += g.advance.x;
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118 pen.y += g.advance.y;
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119 }
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120 }
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121
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122 ~this () {
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123 FT_Done_Face (face);
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124 }
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125
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126 private:
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127 FT_Face face;
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128 }