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annotate libs/drawtext/drawtext.h @ 17:aef7f51f6397

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author John Tsiombikas <nuclear@member.fsf.org>
date Wed, 10 Jun 2015 06:56:27 +0300
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children d7fe157c402d
rev   line source
nuclear@10 1 /*
nuclear@10 2 libdrawtext - a simple library for fast text rendering in OpenGL
nuclear@10 3 Copyright (C) 2011-2014 John Tsiombikas <nuclear@member.fsf.org>
nuclear@10 4
nuclear@10 5 This program is free software: you can redistribute it and/or modify
nuclear@10 6 it under the terms of the GNU Lesser General Public License as published by
nuclear@10 7 the Free Software Foundation, either version 3 of the License, or
nuclear@10 8 (at your option) any later version.
nuclear@10 9
nuclear@10 10 This program is distributed in the hope that it will be useful,
nuclear@10 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@10 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@10 13 GNU Lesser General Public License for more details.
nuclear@10 14
nuclear@10 15 You should have received a copy of the GNU Lesser General Public License
nuclear@10 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@10 17 */
nuclear@10 18 #ifndef LIBDRAWTEXT_H_
nuclear@10 19 #define LIBDRAWTEXT_H_
nuclear@10 20
nuclear@10 21 #include <stdio.h>
nuclear@10 22 #include <stdlib.h>
nuclear@10 23
nuclear@10 24 struct dtx_font;
nuclear@10 25 struct dtx_glyphmap;
nuclear@10 26
nuclear@10 27 /* draw buffering modes */
nuclear@10 28 enum {
nuclear@10 29 DTX_NBF, /* unbuffered */
nuclear@10 30 DTX_LBF, /* line buffered */
nuclear@10 31 DTX_FBF /* fully buffered */
nuclear@10 32 };
nuclear@10 33
nuclear@10 34 struct dtx_box {
nuclear@10 35 float x, y;
nuclear@10 36 float width, height;
nuclear@10 37 };
nuclear@10 38
nuclear@10 39 #ifdef __cplusplus
nuclear@10 40 extern "C" {
nuclear@10 41 #endif
nuclear@10 42
nuclear@10 43 /* Open a truetype/opentype/whatever font.
nuclear@10 44 *
nuclear@10 45 * If sz is non-zero, the default ASCII glyphmap at the requested point size is
nuclear@10 46 * automatically created as well, and ready to use.
nuclear@10 47 *
nuclear@10 48 * To use other unicode ranges and different font sizes you must first call
nuclear@10 49 * dtx_prepare or dtx_prepare_range before issuing any drawing calls, otherwise
nuclear@10 50 * nothing will be rendered.
nuclear@10 51 */
nuclear@10 52 struct dtx_font *dtx_open_font(const char *fname, int sz);
nuclear@10 53 /* open a font by loading a precompiled glyphmap (see: dtx_save_glyphmap)
nuclear@10 54 * this works even when compiled without freetype support
nuclear@10 55 */
nuclear@10 56 struct dtx_font *dtx_open_font_glyphmap(const char *fname);
nuclear@10 57 /* close a font opened by either of the above */
nuclear@10 58 void dtx_close_font(struct dtx_font *fnt);
nuclear@10 59
nuclear@10 60 /* prepare an ASCII glyphmap for the specified font size */
nuclear@10 61 void dtx_prepare(struct dtx_font *fnt, int sz);
nuclear@10 62 /* prepare an arbitrary unicode range glyphmap for the specified font size */
nuclear@10 63 void dtx_prepare_range(struct dtx_font *fnt, int sz, int cstart, int cend);
nuclear@10 64
nuclear@10 65 /* Finds the glyphmap that contains the specified character code and matches the requested size
nuclear@10 66 * Returns null if it hasn't been created (you should call dtx_prepare/dtx_prepare_range).
nuclear@10 67 */
nuclear@10 68 struct dtx_glyphmap *dtx_get_font_glyphmap(struct dtx_font *fnt, int sz, int code);
nuclear@10 69
nuclear@10 70 /* Finds the glyphmap that contains the specified unicode range and matches the requested font size
nuclear@10 71 * Will automatically generate one if it can't find it.
nuclear@10 72 */
nuclear@10 73 struct dtx_glyphmap *dtx_get_font_glyphmap_range(struct dtx_font *fnt, int sz, int cstart, int cend);
nuclear@10 74
nuclear@10 75 /* Creates and returns a glyphmap for a particular unicode range and font size.
nuclear@10 76 * The generated glyphmap is added to the font's list of glyphmaps.
nuclear@10 77 */
nuclear@10 78 struct dtx_glyphmap *dtx_create_glyphmap_range(struct dtx_font *fnt, int sz, int cstart, int cend);
nuclear@10 79 /* free a glyphmap */
nuclear@10 80 void dtx_free_glyphmap(struct dtx_glyphmap *gmap);
nuclear@10 81
nuclear@10 82 /* returns a pointer to the raster image of a glyphmap (1 byte per pixel grayscale) */
nuclear@10 83 unsigned char *dtx_get_glyphmap_image(struct dtx_glyphmap *gmap);
nuclear@10 84 /* returns the width of the glyphmap image in pixels */
nuclear@10 85 int dtx_get_glyphmap_width(struct dtx_glyphmap *gmap);
nuclear@10 86 /* returns the height of the glyphmap image in pixels */
nuclear@10 87 int dtx_get_glyphmap_height(struct dtx_glyphmap *gmap);
nuclear@10 88
nuclear@10 89 /* The following functions can be used even when the library is compiled without
nuclear@10 90 * freetype support.
nuclear@10 91 */
nuclear@10 92 struct dtx_glyphmap *dtx_load_glyphmap(const char *fname);
nuclear@10 93 struct dtx_glyphmap *dtx_load_glyphmap_stream(FILE *fp);
nuclear@10 94 int dtx_save_glyphmap(const char *fname, const struct dtx_glyphmap *gmap);
nuclear@10 95 int dtx_save_glyphmap_stream(FILE *fp, const struct dtx_glyphmap *gmap);
nuclear@10 96
nuclear@10 97 /* adds a glyphmap to a font */
nuclear@10 98 void dtx_add_glyphmap(struct dtx_font *fnt, struct dtx_glyphmap *gmap);
nuclear@10 99
nuclear@10 100 /* ---- rendering ---- */
nuclear@10 101
nuclear@10 102 /* before drawing anything this function must set the font to use */
nuclear@10 103 void dtx_use_font(struct dtx_font *fnt, int sz);
nuclear@10 104
nuclear@10 105 /* sets the buffering mode
nuclear@10 106 * - DTX_NBUF: every call to dtx_string gets rendered immediately.
nuclear@10 107 * - DTX_LBUF: renders when the buffer is full or the string contains a newline.
nuclear@10 108 * - DTX_FBUF: renders only when the buffer is full (you must call dtx_flush explicitly).
nuclear@10 109 */
nuclear@10 110 void dtx_draw_buffering(int mode);
nuclear@10 111
nuclear@10 112 /* Sets the vertex attribute indices to use for passing vertex and texture coordinate
nuclear@10 113 * data. By default both are -1 which means you don't have to use a shader, and if you
nuclear@10 114 * do they are accessible through gl_Vertex and gl_MultiTexCoord0, as usual.
nuclear@10 115 *
nuclear@10 116 * NOTE: If you are using OpenGL ES 2.x or OpenGL >= 3.1 pure (non-compatibility) context
nuclear@10 117 * you must specify valid attribute indices.
nuclear@10 118 */
nuclear@10 119 void dtx_vertex_attribs(int vert_attr, int tex_attr);
nuclear@10 120
nuclear@10 121 /* draws a single glyph at the origin */
nuclear@10 122 void dtx_glyph(int code);
nuclear@10 123 /* draws a utf-8 string starting at the origin. \n \r and \t are handled appropriately. */
nuclear@10 124 void dtx_string(const char *str);
nuclear@10 125
nuclear@10 126 void dtx_printf(const char *fmt, ...);
nuclear@10 127
nuclear@10 128 /* render any pending glyphs (see dtx_draw_buffering) */
nuclear@10 129 void dtx_flush(void);
nuclear@10 130
nuclear@10 131
nuclear@10 132 /* ---- encodings ---- */
nuclear@10 133
nuclear@10 134 /* returns a pointer to the next character in a utf-8 stream */
nuclear@10 135 char *dtx_utf8_next_char(char *str);
nuclear@10 136
nuclear@10 137 /* returns the unicode character codepoint of the utf-8 character starting at str */
nuclear@10 138 int dtx_utf8_char_code(const char *str);
nuclear@10 139
nuclear@10 140 /* returns the number of bytes of the utf-8 character starting at str */
nuclear@10 141 int dtx_utf8_nbytes(const char *str);
nuclear@10 142
nuclear@10 143 /* returns the number of utf-8 character in a zero-terminated utf-8 string */
nuclear@10 144 int dtx_utf8_char_count(const char *str);
nuclear@10 145
nuclear@10 146 /* Converts a unicode code-point to a utf-8 character by filling in the buffer
nuclear@10 147 * passed at the second argument, and returns the number of bytes taken by that
nuclear@10 148 * utf-8 character.
nuclear@10 149 * It's valid to pass a null buffer pointer, in which case only the byte count is
nuclear@10 150 * returned (useful to figure out how much memory to allocate for a buffer).
nuclear@10 151 */
nuclear@10 152 size_t dtx_utf8_from_char_code(int code, char *buf);
nuclear@10 153
nuclear@10 154 /* Converts a unicode utf-16 wchar_t string to utf-8, filling in the buffer passed
nuclear@10 155 * at the second argument. Returns the size of the resulting string in bytes.
nuclear@10 156 *
nuclear@10 157 * It's valid to pass a null buffer pointer, in which case only the size gets
nuclear@10 158 * calculated and returned, which is useful for figuring out how much memory to
nuclear@10 159 * allocate for the utf-8 buffer.
nuclear@10 160 */
nuclear@10 161 size_t dtx_utf8_from_string(const wchar_t *str, char *buf);
nuclear@10 162
nuclear@10 163
nuclear@10 164 /* ---- metrics ---- */
nuclear@10 165 float dtx_line_height(void);
nuclear@10 166
nuclear@10 167 /* rendered dimensions of a single glyph */
nuclear@10 168 void dtx_glyph_box(int code, struct dtx_box *box);
nuclear@10 169 float dtx_glyph_width(int code);
nuclear@10 170 float dtx_glyph_height(int code);
nuclear@10 171
nuclear@10 172 /* rendered dimensions of a string */
nuclear@10 173 void dtx_string_box(const char *str, struct dtx_box *box);
nuclear@10 174 float dtx_string_width(const char *str);
nuclear@10 175 float dtx_string_height(const char *str);
nuclear@10 176
nuclear@10 177 /* returns the horizontal position of the n-th character of the rendered string
nuclear@10 178 * (useful for placing cursors)
nuclear@10 179 */
nuclear@10 180 float dtx_char_pos(const char *str, int n);
nuclear@10 181
nuclear@10 182 int dtx_char_at_pt(const char *str, float pt);
nuclear@10 183
nuclear@10 184 #ifdef __cplusplus
nuclear@10 185 }
nuclear@10 186 #endif
nuclear@10 187
nuclear@10 188 #endif /* LIBDRAWTEXT_H_ */