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1 /*
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2 libdrawtext - a simple library for fast text rendering in OpenGL
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3 Copyright (C) 2011 John Tsiombikas <nuclear@member.fsf.org>
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU Lesser General Public License as published by
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7 the Free Software Foundation, either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18 #ifndef TEXT_IMPL_H_
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19 #define TEXT_IMPL_H_
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20
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21 struct glyph {
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22 int code;
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23 float x, y, width, height;
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24 /* normalized coords [0, 1] */
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25 float nx, ny, nwidth, nheight;
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26 float orig_x, orig_y;
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27 float advance;
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28 struct glyph *next;
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29 };
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30
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31 struct dtx_glyphmap {
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32 int ptsize;
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33
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34 int xsz, ysz;
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35 unsigned char *pixels;
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36 unsigned int tex;
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37
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38 int cstart, cend; /* character range */
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39 int crange;
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40
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41 float line_advance;
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42
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43 struct glyph *glyphs;
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44 struct dtx_glyphmap *next;
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45 };
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46
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47 struct dtx_font {
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48 /* freetype FT_Face */
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49 void *face;
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50
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51 /* list of glyphmaps */
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52 struct dtx_glyphmap *gmaps;
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53
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54 /* last returned glyphmap (cache) */
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55 struct dtx_glyphmap *last_gmap;
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56 };
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57
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58
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59 struct dtx_font *dtx_font;
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60 int dtx_font_sz;
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61
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62
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63 #define fperror(str) \
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64 fprintf(stderr, "%s: %s: %s\n", __func__, (str), strerror(errno))
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65
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66 int dtx_gl_init(void);
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67
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68 /* returns zero if it should NOT be printed and modifies xpos/ypos */
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69 /* implemented in font.c */
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70 struct dtx_glyphmap *dtx_proc_char(int code, float *xpos, float *ypos);
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71
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72 #endif /* TEXT_IMPL_H_ */
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