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comparison 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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43:1530d9c04d4d 44:07bd1a09e161
1 /* LICENSE BLOCK
2 Part of mde: a Modular D game-oriented Engine
3 Copyright © 2007-2008 Diggory Hardy
4
5 This program is free software: you can redistribute it and/or modify it under the terms
6 of the GNU General Public License as published by the Free Software Foundation, either
7 version 2 of the License, or (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
10 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 See the GNU General Public License for more details.
12
13 You should have received a copy of the GNU General Public License
14 along with this program. If not, see <http://www.gnu.org/licenses/>. */
15
16 /// Sets up freetype (in a basic way).
17 module mde.resource.font;
18
19 import mde.resource.exception;
20
21 import derelict.freetype.ft;
22 import derelict.opengl.gl;
23
24 import tango.stdc.stringz;
25 import tango.util.log.Log : Log, Logger;
26
27 private Logger logger;
28 static this () {
29 logger = Log.getLogger ("mde.resource.font");
30 }
31
32 /** Font class.
33 *
34 * Particular to a font and size. (Maybe not size?) */
35 class Font
36 {
37 //BEGIN Static: manager
38 static {
39 /** Load the freetype library. */
40 void initialize () {
41 if (FT_Init_FreeType (&library))
42 throw new fontException ("error initialising the FreeType library");
43 }
44
45 //FIXME: don't use GC for Font resources
46 /** Cleanup: delete all fonts. */
47 void cleanup () {
48 if (font)
49 delete font;
50
51 FT_Done_FreeType (library);
52 }
53
54 /** Get a font.
55 *
56 * Later specify font/size.
57 *
58 * Throws:
59 * fontLoadException when unable to load the font. */
60 Font get(char[] path) {
61 if (font is null) font = new Font(path);
62 return font;
63 }
64
65 private:
66 FT_Library library;
67 Font font;
68 }
69 //END Static
70
71
72 /** Load & cache a new font. */
73 this (char[] path)
74 in {
75 assert (library !is null, "font: library is null");
76 } body {
77 if (FT_New_Face (library, toStringz(path), 0, &face))
78 throw new fontLoadException ("Unable to read font: "~path);
79
80 if (FT_Set_Pixel_Sizes (face, 12,12))
81 throw new fontLoadException ("Unable to set pixel size");
82 }
83
84 void drawStr (int x, int y, char[] str) {
85 FT_Vector pen = { x*64, y*64 };
86 auto g = face.glyph;
87
88 FT_Matrix m;
89 m.xx = 0x10000;
90 m.xy = m.yx = 0;
91 m.yy = -0x10000;
92
93 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
94
95 FT_Pos y_adj = 0; // y adjustment (for height)
96
97 foreach (chr; str) {
98 FT_Set_Transform(face, &m, &pen);
99 if (FT_Load_Char(face, chr, FT_LOAD_RENDER))
100 return; // give up
101
102 if (y_adj < g.metrics.height) y_adj = g.metrics.height;
103
104 auto b = g.bitmap;
105 if (b.pixel_mode != FT_Pixel_Mode.FT_PIXEL_MODE_GRAY || b.num_grays != 256) {
106 char[128] tmp;
107 logger.warn (logger.format (tmp,"Unsupported freetype bitmap format: {}, {}", b.pixel_mode, b.num_grays));
108 return;
109 }
110 if (b.pitch != b.width)
111 logger.info ("b.pitch != b.width");
112
113 //NOTE: y direction!
114 glRasterPos2i (g.bitmap_left,g.bitmap_top + y_adj/64);
115 glDrawPixels (b.width, b.rows, GL_LUMINANCE, GL_UNSIGNED_BYTE, cast(void*) b.buffer);
116
117 pen.x += g.advance.x;
118 pen.y += g.advance.y;
119 }
120 }
121
122 ~this () {
123 FT_Done_Face (face);
124 }
125
126 private:
127 FT_Face face;
128 }