1 /*

2 libdrawtext - a simple library for fast text rendering in OpenGL

3 Copyright (C) 2011 John Tsiombikas <nuclear@member.fsf.org>

4

5 This program is free software: you can redistribute it and/or modify

6 it under the terms of the GNU Lesser General Public License as published by

7 the Free Software Foundation, either version 3 of the License, or

8 (at your option) any later version.

9

10 This program is distributed in the hope that it will be useful,

11 but WITHOUT ANY WARRANTY; without even the implied warranty of

12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13 GNU Lesser General Public License for more details.

14

15 You should have received a copy of the GNU Lesser General Public License

16 along with this program. If not, see <http://www.gnu.org/licenses/>.

17 */

18 #ifndef TEXT_IMPL_H_

19 #define TEXT_IMPL_H_

20

21 struct glyph {

22 int code;

23 float x, y, width, height;

24 /* normalized coords [0, 1] */

25 float nx, ny, nwidth, nheight;

26 float orig_x, orig_y;

27 float advance;

28 struct glyph *next;

29 };

30

31 struct dtx_glyphmap {

32 int ptsize;

33

34 int xsz, ysz;

35 unsigned char *pixels;

36 unsigned int tex;

37

38 int cstart, cend; /* character range */

39 int crange;

40

41 float line_advance;

42

43 struct glyph *glyphs;

44 struct dtx_glyphmap *next;

45 };

46

47 struct dtx_font {

48 /* freetype FT_Face */

49 void *face;

50

51 /* list of glyphmaps */

52 struct dtx_glyphmap *gmaps;

53

54 /* last returned glyphmap (cache) */

55 struct dtx_glyphmap *last_gmap;

56 };

57

58

59 struct dtx_font *dtx_font;

60 int dtx_font_sz;

61

62

63 #define fperror(str) \

64 fprintf(stderr, "%s: %s: %s\n", __func__, (str), strerror(errno))

65

66 int dtx_gl_init(void);

67

68 /* returns zero if it should NOT be printed and modifies xpos/ypos */

69 /* implemented in font.c */

70 struct dtx_glyphmap *dtx_proc_char(int code, float *xpos, float *ypos);

71

72 #endif /* TEXT_IMPL_H_ */