[a1614eb] | 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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[cba8bf34] | 6 | // Copyright (C) 2011,2013,2014 Olly Betts |
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[a1614eb] | 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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[ee63994] | 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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[a1614eb] | 32 | #endif |
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| 33 | |
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| 34 | class BitmapFont { |
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| 35 | enum { |
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[36b4cd7] | 36 | // The highest character point to generate an OpenGL list for. |
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[a1614eb] | 37 | // |
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[36b4cd7] | 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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[a1614eb] | 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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[7ada45b] | 49 | mutable const unsigned char * extra_data; |
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[6e94014] | 50 | |
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| 51 | mutable int * extra_chars; |
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[36b4cd7] | 52 | |
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| 53 | unsigned char char_width[BITMAPFONT_MAX_CHAR]; |
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| 54 | |
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[cba8bf34] | 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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[36b4cd7] | 59 | void write_glyph(wxChar ch) const; |
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[a1614eb] | 60 | |
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[614d60b] | 61 | wxString font_file; |
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| 62 | |
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[a1614eb] | 63 | public: |
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| 64 | |
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[6e94014] | 65 | BitmapFont() : gllist_base(0), extra_data(0), extra_chars(0) { } |
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[a1614eb] | 66 | |
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| 67 | ~BitmapFont() { |
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| 68 | if (gllist_base) |
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| 69 | glDeleteLists(gllist_base, BITMAPFONT_MAX_CHAR); |
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| 70 | } |
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| 71 | |
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| 72 | bool load(const wxString & font_file); |
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| 73 | |
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| 74 | // Hard-code for now. |
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| 75 | int get_font_size() const { return 16; } |
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| 76 | |
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| 77 | void get_text_extent(const wxChar *s, size_t len, int *width, int *height) const { |
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| 78 | if (width) { |
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| 79 | int total_width = 0; |
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| 80 | while (len--) { |
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[6f9b20d] | 81 | int ch = *s++; |
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[a1614eb] | 82 | if (ch < BITMAPFONT_MAX_CHAR) |
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| 83 | total_width += char_width[ch]; |
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[d4d6909] | 84 | else |
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[cba8bf34] | 85 | total_width += glyph_width(ch); |
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[a1614eb] | 86 | } |
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| 87 | *width = total_width; |
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| 88 | } |
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| 89 | if (height) { |
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| 90 | *height = get_font_size() + 1; |
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| 91 | } |
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| 92 | } |
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| 93 | |
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| 94 | void write_string(const wxChar *s, size_t len) const; |
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| 95 | }; |
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| 96 | |
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| 97 | #endif |
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