1 | // |
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2 | // glbitmapfont.h |
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3 | // |
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4 | // Draw text using glBitmap. |
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5 | // |
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6 | // Copyright (C) 2011,2013,2014 Olly Betts |
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7 | // |
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8 | // This program is free software; you can redistribute it and/or modify |
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9 | // it under the terms of the GNU General Public License as published by |
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10 | // the Free Software Foundation; either version 2 of the License, or |
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11 | // (at your option) any later version. |
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12 | // |
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13 | // This program is distributed in the hope that it will be useful, |
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14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | // GNU General Public License for more details. |
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17 | // |
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18 | // You should have received a copy of the GNU General Public License |
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19 | // along with this program; if not, write to the Free Software |
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20 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | // |
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22 | |
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23 | #ifndef GLBITMAPFONT_H_INCLUDED |
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24 | #define GLBITMAPFONT_H_INCLUDED |
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25 | |
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26 | #include "wx.h" |
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27 | |
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28 | #ifdef HAVE_GL_GL_H |
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29 | # include <GL/gl.h> |
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30 | #elif defined HAVE_OPENGL_GL_H |
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31 | # include <OpenGL/gl.h> |
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32 | #endif |
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33 | |
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34 | class BitmapFont { |
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35 | enum { |
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36 | // The highest character point to generate an OpenGL list for. |
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37 | // |
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38 | // We can't generate a GL list for every Unicode character, so we |
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39 | // generate them for the first BITMAPFONT_MAX_CHAR characters and then |
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40 | // use glBitmap directly to draw other characters if they are needed. |
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41 | // |
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42 | // FIXME: We could perhaps even store strings consisting of only the |
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43 | // first 256 points as ISO8859-1. |
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44 | BITMAPFONT_MAX_CHAR = 256 |
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45 | }; |
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46 | |
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47 | int gllist_base; |
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48 | |
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49 | mutable const unsigned char * extra_data; |
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50 | |
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51 | mutable int * extra_chars; |
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52 | |
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53 | unsigned char char_width[BITMAPFONT_MAX_CHAR]; |
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54 | |
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55 | void init_extra_chars() const; |
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56 | |
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57 | int glyph_width(wxChar ch) const; |
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58 | |
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59 | void write_glyph(wxChar ch) const; |
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60 | |
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61 | wxString font_file; |
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62 | |
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63 | public: |
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64 | |
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65 | BitmapFont() : gllist_base(0), extra_data(0), extra_chars(0) { } |
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66 | |
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67 | ~BitmapFont(); |
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68 | |
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69 | bool load(const wxString & font_file); |
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70 | |
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71 | // Hard-code for now. |
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72 | int get_font_size() const { return 16; } |
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73 | |
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74 | void get_text_extent(const wxChar *s, size_t len, int *width, int *height) const { |
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75 | if (width) { |
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76 | int total_width = 0; |
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77 | while (len--) { |
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78 | int ch = *s++; |
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79 | if (ch < BITMAPFONT_MAX_CHAR) |
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80 | total_width += char_width[ch]; |
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81 | else |
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82 | total_width += glyph_width(ch); |
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83 | } |
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84 | *width = total_width; |
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85 | } |
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86 | if (height) { |
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87 | *height = get_font_size() + 1; |
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88 | } |
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89 | } |
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90 | |
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91 | void write_string(const wxChar *s, size_t len) const; |
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92 | }; |
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93 | |
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94 | #endif |
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