ae.ui.video.bmfont source code

1 /**
2  * Rendering for simple bitmap fonts.
3  *
4  * License:
5  *   This Source Code Form is subject to the terms of
6  *   the Mozilla Public License, v. 2.0. If a copy of
7  *   the MPL was not distributed with this file, You
8  *   can obtain one at http://mozilla.org/MPL/2.0/.
9  *
10  * Authors:
11  *   Vladimir Panteleev <ae@cy.md>
12  */
13 
14 module ae.ui.video.bmfont;
15 
16 import ae.ui.video.renderer;
17 import ae.utils.array;
18 import ae.utils.graphics.fonts.draw;
19 
20 /// Adapter from a font (as in `ae.utils.graphics.fonts`)
21 /// and `ProceduralTextureSource` .
22 final class FontTextureSource(Font) : ProceduralTextureSource
23 {
24 	Font font;
25 	Renderer.COLOR color;
26 
27 	this(Font font, Renderer.COLOR color)
28 	{
29 		this.font = font;
30 		this.color = color;
31 	} ///
32 
33 	override void getSize(out int width, out int height)
34 	{
35 		width = font.maxWidth;
36 		height = font.maxGlyph * font.height;
37 	}
38 
39 	override void drawTo(TextureCanvas dest)
40 	{
41 		foreach (g; 0..font.maxGlyph)
42 		{
43 			dchar c = g;
44 			dest.drawText(0, g * font.height, c.toArray, font, color);
45 		}
46 	}
47 
48 	void drawText(S)(Renderer r, int x, int y, S s)
49 	{
50 		foreach (c; s)
51 		{
52 			if (font.hasGlyph(c))
53 			{
54 				auto g = font.getGlyph(c);
55 				auto v = c * font.height;
56 				r.draw(x, y, this, 0, v, g.width, v + font.height);
57 				x += g.width;
58 			}
59 		}
60 	}
61 }
62 
63 unittest
64 {
65 	// Test instantiation
66 	if (false)
67 	{
68 		Renderer r;
69 		import ae.utils.graphics.fonts.font8x8;
70 		FontTextureSource!Font8x8 f;
71 		f.drawText(r, 0, 0, "foo");
72 	}
73 }