root/OpenSceneGraph/trunk/src/osgText/DefaultFont.cpp @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY{
10}
11
12 without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * OpenSceneGraph Public License for more details.
15*/
16
17#include <stdlib.h>
18#include "DefaultFont.h"
19
20#include <osg/Notify>
21
22using namespace osgText;
23
24
25DefaultFont::DefaultFont()
26{
27    _minFilterHint = osg::Texture::LINEAR_MIPMAP_LINEAR;
28    _magFilterHint = osg::Texture::NEAREST;
29    constructGlyphs();
30}
31
32DefaultFont::~DefaultFont()
33{
34}
35
36osgText::Glyph* DefaultFont::getGlyph(const FontResolution& fontRes, unsigned int charcode)
37{
38    if (_sizeGlyphMap.empty()) return 0;
39
40    FontSizeGlyphMap::iterator itr = _sizeGlyphMap.find(fontRes);
41    if (itr==_sizeGlyphMap.end())
42    {
43        // no font found of correct size, will need to find the nearest.
44        itr = _sizeGlyphMap.begin();
45        int mindeviation = abs((int)fontRes.first-(int)itr->first.first)+
46                           abs((int)fontRes.second-(int)itr->first.second);
47        FontSizeGlyphMap::iterator sitr=itr;
48        ++sitr;
49        for(;
50            sitr!=_sizeGlyphMap.end();
51            ++sitr)
52        {
53            int deviation = abs((int)fontRes.first-(int)sitr->first.first)+
54                            abs((int)fontRes.second-(int)sitr->first.second);
55            if (deviation<mindeviation)
56            {
57                mindeviation = deviation;
58                itr = sitr;
59            }
60        }
61    }
62
63    // new find the glyph for the required charcode.
64    GlyphMap& glyphmap = itr->second;
65    GlyphMap::iterator gitr = glyphmap.find(charcode);
66
67    if (gitr!=glyphmap.end()) return gitr->second.get();
68    else return 0;
69}
70
71
72osg::Vec2 DefaultFont::getKerning(unsigned int,unsigned int, KerningType)
73{
74    // no kerning on default font.
75    return osg::Vec2(0.0f,0.0f);
76}
77
78bool DefaultFont::hasVertical() const
79{
80    return true;
81}
82
83void DefaultFont::constructGlyphs()
84{
85   static GLubyte rasters[][12] = { // ascii symbols 32-127, small font
86        {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
87        {0x00, 0x00, 0x08, 0x00, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x00},
88        {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x14, 0x14, 0x14, 0x00},
89        {0x00, 0x00, 0x28, 0x28, 0x7e, 0x14, 0x14, 0x14, 0x3f, 0x0a, 0x0a, 0x00},
90        {0x00, 0x00, 0x08, 0x1c, 0x22, 0x02, 0x1c, 0x20, 0x22, 0x1c, 0x08, 0x00},
91        {0x00, 0x00, 0x02, 0x45, 0x22, 0x10, 0x08, 0x04, 0x22, 0x51, 0x20, 0x00},
92        {0x00, 0x00, 0x3b, 0x44, 0x4a, 0x49, 0x30, 0x10, 0x20, 0x20, 0x18, 0x00},
93        {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x08, 0x08, 0x00},
94        {0x04, 0x08, 0x08, 0x10, 0x10, 0x10, 0x10, 0x10, 0x08, 0x08, 0x04, 0x00},
95        {0x10, 0x08, 0x08, 0x04, 0x04, 0x04, 0x04, 0x04, 0x08, 0x08, 0x10, 0x00},
96        {0x00, 0x00, 0x00, 0x00, 0x36, 0x1c, 0x7f, 0x1c, 0x36, 0x00, 0x00, 0x00},
97        {0x00, 0x00, 0x08, 0x08, 0x08, 0x7f, 0x08, 0x08, 0x08, 0x00, 0x00, 0x00},
98        {0x00, 0x10, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
99        {0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
100        {0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
101        {0x00, 0x00, 0x00, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01, 0x00, 0x00},
102        {0x00, 0x00, 0x1c, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x1c, 0x00},
103        {0x00, 0x00, 0x3e, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x38, 0x08, 0x00},
104        {0x00, 0x00, 0x3e, 0x20, 0x10, 0x08, 0x04, 0x02, 0x02, 0x22, 0x1c, 0x00},
105        {0x00, 0x00, 0x1c, 0x22, 0x02, 0x02, 0x0c, 0x02, 0x02, 0x22, 0x1c, 0x00},
106        {0x00, 0x00, 0x0e, 0x04, 0x3e, 0x24, 0x14, 0x14, 0x0c, 0x0c, 0x04, 0x00},
107        {0x00, 0x00, 0x1c, 0x22, 0x02, 0x02, 0x3c, 0x20, 0x20, 0x20, 0x3e, 0x00},
108        {0x00, 0x00, 0x1c, 0x22, 0x22, 0x22, 0x3c, 0x20, 0x20, 0x10, 0x0c, 0x00},
109        {0x00, 0x00, 0x10, 0x10, 0x08, 0x08, 0x04, 0x04, 0x02, 0x22, 0x3e, 0x00},
110        {0x00, 0x00, 0x1c, 0x22, 0x22, 0x22, 0x1c, 0x22, 0x22, 0x22, 0x1c, 0x00},
111        {0x00, 0x00, 0x18, 0x04, 0x02, 0x02, 0x1e, 0x22, 0x22, 0x22, 0x1c, 0x00},
112        {0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00},
113        {0x00, 0x10, 0x08, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00},
114        {0x00, 0x00, 0x04, 0x08, 0x10, 0x20, 0x10, 0x08, 0x04, 0x00, 0x00, 0x00},
115        {0x00, 0x00, 0x00, 0x00, 0x00, 0x3e, 0x00, 0x3e, 0x00, 0x00, 0x00, 0x00},
116        {0x00, 0x00, 0x10, 0x08, 0x04, 0x02, 0x04, 0x08, 0x10, 0x00, 0x00, 0x00},
117        {0x00, 0x00, 0x08, 0x00, 0x08, 0x08, 0x04, 0x02, 0x02, 0x22, 0x1c, 0x00},
118        {0x00, 0x00, 0x1c, 0x20, 0x4e, 0x55, 0x55, 0x55, 0x4d, 0x21, 0x1e, 0x00},
119        {0x00, 0x00, 0x77, 0x22, 0x3e, 0x22, 0x14, 0x14, 0x08, 0x08, 0x18, 0x00},
120        {0x00, 0x00, 0x7e, 0x21, 0x21, 0x21, 0x3e, 0x21, 0x21, 0x21, 0x7e, 0x00},
121        {0x00, 0x00, 0x1e, 0x21, 0x40, 0x40, 0x40, 0x40, 0x40, 0x21, 0x1e, 0x00},
122        {0x00, 0x00, 0x7c, 0x22, 0x21, 0x21, 0x21, 0x21, 0x21, 0x22, 0x7c, 0x00},
123        {0x00, 0x00, 0x7f, 0x21, 0x20, 0x24, 0x3c, 0x24, 0x20, 0x21, 0x7f, 0x00},
124        {0x00, 0x00, 0x78, 0x20, 0x20, 0x24, 0x3c, 0x24, 0x20, 0x21, 0x7f, 0x00},
125        {0x00, 0x00, 0x1e, 0x21, 0x41, 0x47, 0x40, 0x40, 0x40, 0x21, 0x1e, 0x00},
126        {0x00, 0x00, 0x77, 0x22, 0x22, 0x22, 0x3e, 0x22, 0x22, 0x22, 0x77, 0x00},
127        {0x00, 0x00, 0x3e, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x3e, 0x00},
128        {0x00, 0x00, 0x38, 0x44, 0x44, 0x04, 0x04, 0x04, 0x04, 0x04, 0x1e, 0x00},
129        {0x00, 0x00, 0x73, 0x22, 0x24, 0x38, 0x28, 0x24, 0x24, 0x22, 0x73, 0x00},
130        {0x00, 0x00, 0x7f, 0x11, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x7c, 0x00},
131        {0x00, 0x00, 0x77, 0x22, 0x22, 0x2a, 0x2a, 0x36, 0x36, 0x22, 0x63, 0x00},
132        {0x00, 0x00, 0x72, 0x22, 0x26, 0x26, 0x2a, 0x32, 0x32, 0x22, 0x67, 0x00},
133        {0x00, 0x00, 0x1c, 0x22, 0x41, 0x41, 0x41, 0x41, 0x41, 0x22, 0x1c, 0x00},
134        {0x00, 0x00, 0x78, 0x20, 0x20, 0x20, 0x3e, 0x21, 0x21, 0x21, 0x7e, 0x00},
135        {0x00, 0x1b, 0x1c, 0x22, 0x41, 0x41, 0x41, 0x41, 0x41, 0x22, 0x1c, 0x00},
136        {0x00, 0x00, 0x73, 0x22, 0x24, 0x24, 0x3e, 0x21, 0x21, 0x21, 0x7e, 0x00},
137        {0x00, 0x00, 0x3e, 0x41, 0x01, 0x01, 0x3e, 0x40, 0x40, 0x41, 0x3e, 0x00},
138        {0x00, 0x00, 0x1c, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x49, 0x7f, 0x00},
139        {0x00, 0x00, 0x1c, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x77, 0x00},
140        {0x00, 0x00, 0x08, 0x08, 0x14, 0x14, 0x14, 0x22, 0x22, 0x22, 0x77, 0x00},
141        {0x00, 0x00, 0x14, 0x14, 0x2a, 0x2a, 0x2a, 0x22, 0x22, 0x22, 0x77, 0x00},
142        {0x00, 0x00, 0x77, 0x22, 0x14, 0x14, 0x08, 0x14, 0x14, 0x22, 0x77, 0x00},
143        {0x00, 0x00, 0x1c, 0x08, 0x08, 0x08, 0x14, 0x14, 0x22, 0x22, 0x77, 0x00},
144        {0x00, 0x00, 0x7f, 0x21, 0x10, 0x10, 0x08, 0x04, 0x04, 0x42, 0x7f, 0x00},
145        {0x1c, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x1c, 0x00},
146        {0x00, 0x00, 0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x00, 0x00},
147        {0x1c, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x1c, 0x00},
148        {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x22, 0x14, 0x08},
149        {0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
150        {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x10, 0x00},
151        {0x00, 0x00, 0x3d, 0x42, 0x42, 0x3e, 0x02, 0x3c, 0x00, 0x00, 0x00, 0x00},
152        {0x00, 0x00, 0x7e, 0x21, 0x21, 0x21, 0x21, 0x3e, 0x20, 0x20, 0x60, 0x00},
153        {0x00, 0x00, 0x3e, 0x41, 0x40, 0x40, 0x41, 0x3e, 0x00, 0x00, 0x00, 0x00},
154        {0x00, 0x00, 0x3f, 0x42, 0x42, 0x42, 0x42, 0x3e, 0x02, 0x02, 0x06, 0x00},
155        {0x00, 0x00, 0x3e, 0x41, 0x40, 0x7f, 0x41, 0x3e, 0x00, 0x00, 0x00, 0x00},
156        {0x00, 0x00, 0x3c, 0x10, 0x10, 0x10, 0x10, 0x3c, 0x10, 0x10, 0x0c, 0x00},
157        {0x3c, 0x02, 0x02, 0x3e, 0x42, 0x42, 0x42, 0x3f, 0x00, 0x00, 0x00, 0x00},
158        {0x00, 0x00, 0x77, 0x22, 0x22, 0x22, 0x32, 0x2c, 0x20, 0x20, 0x60, 0x00},
159        {0x00, 0x00, 0x3e, 0x08, 0x08, 0x08, 0x08, 0x38, 0x00, 0x00, 0x08, 0x00},
160        {0x38, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x3c, 0x00, 0x00, 0x04, 0x00},
161        {0x00, 0x00, 0x63, 0x24, 0x38, 0x28, 0x24, 0x26, 0x20, 0x20, 0x60, 0x00},
162        {0x00, 0x00, 0x3e, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x18, 0x00},
163        {0x00, 0x00, 0x6b, 0x2a, 0x2a, 0x2a, 0x2a, 0x74, 0x00, 0x00, 0x00, 0x00},
164        {0x00, 0x00, 0x77, 0x22, 0x22, 0x22, 0x32, 0x6c, 0x00, 0x00, 0x00, 0x00},
165        {0x00, 0x00, 0x3e, 0x41, 0x41, 0x41, 0x41, 0x3e, 0x00, 0x00, 0x00, 0x00},
166        {0x70, 0x20, 0x3e, 0x21, 0x21, 0x21, 0x21, 0x7e, 0x00, 0x00, 0x00, 0x00},
167        {0x07, 0x02, 0x3e, 0x42, 0x42, 0x42, 0x42, 0x3f, 0x00, 0x00, 0x00, 0x00},
168        {0x00, 0x00, 0x7c, 0x10, 0x10, 0x10, 0x19, 0x76, 0x00, 0x00, 0x00, 0x00},
169        {0x00, 0x00, 0x3e, 0x41, 0x06, 0x38, 0x41, 0x3e, 0x00, 0x00, 0x00, 0x00},
170        {0x00, 0x00, 0x0c, 0x12, 0x10, 0x10, 0x10, 0x3c, 0x10, 0x10, 0x00, 0x00},
171        {0x00, 0x00, 0x1b, 0x26, 0x22, 0x22, 0x22, 0x66, 0x00, 0x00, 0x00, 0x00},
172        {0x00, 0x00, 0x08, 0x14, 0x14, 0x22, 0x22, 0x77, 0x00, 0x00, 0x00, 0x00},
173        {0x00, 0x00, 0x14, 0x14, 0x2a, 0x2a, 0x22, 0x77, 0x00, 0x00, 0x00, 0x00},
174        {0x00, 0x00, 0x77, 0x22, 0x1c, 0x1c, 0x22, 0x77, 0x00, 0x00, 0x00, 0x00},
175        {0x30, 0x08, 0x08, 0x14, 0x14, 0x22, 0x22, 0x77, 0x00, 0x00, 0x00, 0x00},
176        {0x00, 0x00, 0x7e, 0x22, 0x10, 0x08, 0x44, 0x7e, 0x00, 0x00, 0x00, 0x00},
177        {0x06, 0x08, 0x08, 0x08, 0x08, 0x30, 0x08, 0x08, 0x08, 0x08, 0x06, 0x00},
178        {0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08},
179        {0x30, 0x08, 0x08, 0x08, 0x08, 0x06, 0x08, 0x08, 0x08, 0x08, 0x30, 0x00},
180        {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46, 0x49, 0x31, 0x00, 0x00},
181        {0x00, 0x1c, 0x1c, 0x1c, 0x1c, 0x1c, 0x1c, 0x1c, 0x1c, 0x1c, 0x00, 0x00}
182    };
183
184    unsigned int sourceWidth = 8;
185    unsigned int sourceHeight = 12;
186
187    FontResolution fontRes(sourceWidth,sourceHeight);
188
189    // populate the glyph mp
190    for(unsigned int i=32;i<127;i++)
191    {
192        osg::ref_ptr<Glyph> glyph = new Glyph(this, i);
193
194        unsigned int dataSize = sourceWidth*sourceHeight;
195        unsigned char* data = new unsigned char[dataSize];
196
197        // clear the image to zeros.
198        for(unsigned char* p=data;p<data+dataSize;) { *p++ = 0; }
199
200        glyph->setImage(sourceWidth,sourceHeight,1,
201                        GL_ALPHA,
202                        GL_ALPHA,GL_UNSIGNED_BYTE,
203                        data,
204                        osg::Image::USE_NEW_DELETE,
205                        1);
206
207        glyph->setInternalTextureFormat(GL_ALPHA);
208
209        // now populate data array by converting bitmap into a luminance_alpha map.
210        unsigned char* ptr = rasters[i-32];
211        unsigned char value_on = 255;
212        unsigned char value_off = 0;
213
214        for(unsigned int row=0;row<sourceHeight;++row,++ptr)
215        {
216            (*data++)=((*ptr)&128)?value_on:value_off;
217            (*data++)=((*ptr)&64)?value_on:value_off;
218            (*data++)=((*ptr)&32)?value_on:value_off;
219            (*data++)=((*ptr)&16)?value_on:value_off;
220            (*data++)=((*ptr)&8)?value_on:value_off;
221            (*data++)=((*ptr)&4)?value_on:value_off;
222            (*data++)=((*ptr)&2)?value_on:value_off;
223            (*data++)=((*ptr)&1)?value_on:value_off;
224        }
225
226        float coord_scale = 1.0f/float(sourceHeight);
227
228        glyph->setWidth(sourceWidth*coord_scale);
229        glyph->setHeight(sourceHeight*coord_scale);
230
231        glyph->setHorizontalBearing(osg::Vec2(0.0f,-2*coord_scale)); // bottom left.
232        glyph->setHorizontalAdvance(sourceWidth*coord_scale);
233        glyph->setVerticalBearing(osg::Vec2(0.5f,1.0f)); // top middle.
234        glyph->setVerticalAdvance(sourceHeight*coord_scale);
235
236        addGlyph(fontRes,i,glyph.get());
237    }
238}
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