1 ttf2png - True Type Font to PNG converter
2 Copyright (c) 2004-2018 Mikko Rasa, Mikkosoft Productions
9 C compiler (preferably GCC)
15 Range of code points to convert, specified as unicode code points. The
16 default is 0,255, matching the ISO-8859-1 (Latin-1) character set. Code
17 points can be specified as plain numbers, unicode code points (U+xxxx) or
18 UTF-8 characters. This option can be specified multiple times to add
19 more ranges to be converted.
22 Font size to use. The default is 10 pixels.
25 Number of glyphs to put in one line. Defaults to autodetect. Ignored
28 -c <pixels>[x<pixels>]
29 Character cell size. If only a single number is given, a square cell is
30 used. The special values auto and autorect may be used to choose an
31 autodetected square or rectangle cell, respectively. The default is auto.
32 Ignored if -p is used.
35 Output file name. Use - for stdout; the output is a png image, so it's
36 best to pipe it somewhere. The default is font.png.
39 Force autohinter. By default native hinting is used if present in the
43 Render glyphs to alpha channel, with grey channel filled with white. By
44 default only the grey channel is used.
47 Invert colors of the glyphs. When rendering to alpha channel, only the
48 alpha channel is inverted. The default is to render black glyphs on a
52 Increase the level of verbosity.
55 Use cells in sequence, without leaving gaps. By default the position of
56 each glyph is determined by its code point. Ignored if -p is used.
59 Pack the glyphs tightly in the image. Small gaps are left between glyphs,
60 controlled by the -n option. By default glyphs are rendered in a regular
61 grid. Creating a definition file is recommended, as the resulting image
62 can seem rather messy.
65 Leave a margin around the edges of the generated image. By default glyphs
66 can touch the edges. Only used with -p.
69 Control the amount of padding between glyphs. The default is 1 pixel.
73 File name to write glyph definitions. See the section below for details.
76 Print a help message with option summary.
79 Glyph definition files
81 Rendering a proportional font correctly requires some positioning and spacing
82 information, called font metrics. To that end, ttf2png can write a definition
83 file alongside the image.
85 The basic format is line-based. Empty lines, or those starting with a hash
86 sign (#), should be ignored. Data lines consist of a keyword followed by
87 space-separated fields.
89 The keyword "font" is followed by five fields with overall information about
90 the image and the font:
92 Fields 1-2: width and height of the image
93 Field 3: nominal size of the font
94 Fields 4-5: ascent and descent of the font
96 The keyword "glyph" is followed by eight fields describing a single glyph:
98 Field 1: the code point of the glyph
99 Fields 2-3: x and y position of the glyph in the image
100 Fields 4-5: width and height of the glyph
101 Fields 6-7: x and y offset of the glyph from its base point
102 Field 8: advance from this glyph to the next
104 The keyword "kern" is followed by three fields describing kerning between two
107 Field 1: the code point of the left-hand glyph
108 Field 2: the code point of the right-hand glyph
109 Field 3: kerning distance between the glyphs
111 The following ASCII art image illustrates most of these metrics. Note that in
112 some fonts, not all of the glyphs fit completely inside the character box.
125 _ __x___|_______|___|____|__ baseline
127 v | o-------o | | descent
140 - Alternate ways of specifying code point ranges
141 - Multiple code point ranges can be specified
144 - Controllable margin and padding in packed mode
145 - Do not generate overly large images in sequential grid mode
148 - Improve the packing algorithm
149 - Non-square cells for grid mode
150 - Option to invert colors
151 - Include kerning information in definition file
154 - Restructure the code
155 - Add tight packing mode
156 - Autodetect cell size and chars-per-line in grid mode
159 - Write both X and Y offsets of glyphs to the definition file
160 - Output font ascent and descent to definition file
163 - Don't create too large image with sequential mode if the range is sparse
166 - Added output to stdout
167 - Clean up code a bit
168 - Added sequential mode
169 - Added definition file writing
172 - Added more verbosity
173 - Added transparency mode
181 This program is free software; you can redistribute it and/or
182 modify it under the terms of the GNU General Public License
183 as published by the Free Software Foundation; either version 2
184 of the License, or (at your option) any later version.
186 This program is distributed in the hope that it will be useful,
187 but WITHOUT ANY WARRANTY; without even the implied warranty of
188 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
189 GNU General Public License for more details.
191 You should have received a copy of the GNU General Public License
192 along with this program; if not, write to the Free Software
193 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.