Is there a way to hint unencoded glyphs with ttfautohint? Get Glyphs. Features Learn Forum Resources News. Please upgrade ttfautohint to v1. Is there somewhere better to report stuff like this than the user forum? Ttfautohint: no increase xHeight flag.
Updated the binary. I could try to load the external library automatically if it is newer? Or is this a bad idea? But for things like a notification that a lib needs updating, an email might be enough. How about a custom parameter to use external TTFA and pass flags to it? This can be changed with option --default-script , if necessary.
Note that only OpenType fonts with TrueType outlines are supported. DSIG : If it exists, it gets replaced with a dummy version. This can be controlled with the --no-info option. Family name entries might also be affected by option --family-suffix. VDMX : Removed, since it depends on the original bytecode, which ttfautohint removes.
A font editor might recompute the necessary data later on. This code has been contributed mainly by Infinality , being a subset of his original patch. This extension changes the behaviour of many bytecode instructions to get better rendering results. However, not all changes are global; some of them are specific to certain fonts.
If you are going to process such specially-handled fonts with ttfautohint, serious rendering problems might show up. Fonts with an incorrect Unicode cmap table will not be properly hinted by ttfautohint. Since ttfautohint needs to find both standard and blue zone characters, it relies on correct Unicode values.
If you want to handle such fonts, please fix their cmap tables accordingly before running ttfautohint. If such a segment is missing, it cannot be associated with a blue zone, possibly leading to irregular heights for the particular glyph. Using a Control Instructions File , however, it is possible to define additional segments at arbitrary points that help overcome this restriction, making it possible to fix most of such problems. For thin outlines, this might lead to strokes that look too thick at smaller sizes.
A font designer might compensate this to a certain amount by slightly reducing the stroke width of diagonal lines. The following commits in ttfautohint add Ethiopian and Armenian, respectively. If there are any questions, please contact the FreeType mailing list for help. An entry in a control instructions file has various syntax forms, which are discussed here.
Brackets indicate optional elements. If missing, it is set to zero. For normal TrueType fonts, only value zero is valid. A font index can be specified in decimal, octal, or hexadecimal format, the latter two indicated by the prefixes 0 and 0x , respectively. Glyph names are internally converted to glyph indices. An empty line is ignored also.
A control instructions file is parsed line by line; later entries override earlier entries in case there is something to override. The elements of glyph-ids are a list of comma separated glyph-id values or value ranges. Note that is not necessary that elements are specified in increasing order.
Use the --debug command line option to see how ttfautohint assigns glyph indices of a font to styles. The effect of this adjustment depends on the selected stem width algorithm. For smooth stem width positioning, only the first i. For strong stem width positioning, the stem widths are snapped to the provided values if not differing too much before rounding to an integer pixel value. For natural stem width positioning, this adjustment is ignored. A typical example is to reduce the default stem width of an extra-bold font, which gets better hinted if a stem width of, say, is used instead of the default value We can achieve this with the following lines in a control instructions file.
Use the --debug command line option to see how ttfautohint assigns stem widths to styles by default. If the specified direction is identical to what ttfautohint computes, nothing special happens. Otherwise, a one-point segment with the specified direction gets created, see above.
By default, its length is zero. They are sufficiently similar to expect that ttfautohint hints them equally. However, this is not the case. The same glyphs, shown at 12px before hinting. As a consequence, vertical delta exceptions entered with point should not be used in ClearType mode.
If both values are zero, the delta exception entry is ignored as a whole. Values for ppems must be in the range [6;53]. Values for points are limited by the number of points in the glyph. This corresponds to the line. This section documents the public functions of the ttfautohint library together with its callback functions. All information has been directly extracted from the ttfautohint.
A pointer to a function provided by the calling application to allocate memory. A callback function to get progress information. See file ttfautohint-errors. Error codes not in this list are directly taken from FreeType; see the FreeType header file fterrdef. The next three parameters help identify the origin of text string parsing errors.
A callback function to access or modify strings in the name table; it is called in a loop that iterates over all name table entries. Please refer to the OpenType specification of the name table for a detailed description of the various parameters, in particular which encoding is used for a given platform and encoding ID. Read a TrueType font, remove existing bytecode in the SFNT tables prep , fpgm , cvt , and glyf , and write a new TrueType font with new bytecode based on the autohinting of the FreeType library, optionally using a reference font to derive blue zones.
It expects a format string options and a variable number of arguments, depending on the fields in options. The fields are comma separated; whitespace within the format string is not significant, a trailing comma is ignored. The same is true for fields that are mutually exclusive. Depending on the field, zero or one argument is expected.
The next two fields are necessary on some platforms if ttfautohint is compiled as a shared library, and the application uses a different runtime library. Mutually exclusive with control-buffer. If this field is not set or set to NULL, no error callback function is used. The used resolution is the em-size in font units; for most fonts this is ppem. Use this only if the old hints move or scale subglyphs independently of the output resolution, for example some exotic CJK fonts.
By default, such glyphs are hinted; if option fallback-scaling is set, they are scaled only instead. Valid values can be found in the header file ttfautohint-scripts. Set the horizontal stem width hinting value for all scripts that lack proper standard characters. For symbol fonts i. The format of the output data resembles the information at the very beginning of the dump emitted by option debug. Main use of this option is for font editing purposes. The new glyphs are then hinted while hints of the old glyphs stay unchanged.
If this option is not set, and the font to be processed contains a TTFA table, it gets removed. Note that such a TTFA table gets ignored by all font rendering engines. Obviously, it is necessary to have an input and an output data stream. All other options are optional. If a PPEM value is smaller than the value of hinting-range-min , hinting still takes place but the configuration created for hinting-range-min is used. The analogous action is taken for hinting-range-max , only limited by the value given with hinting-limit.
This limitation might change in the future. These three macros give the major, minor, and revision number of the library, respectively. For tarball releases it has the form X. If the revision number is zero, it is omitted.
Examples: 2. Example: 2. Return the ttfautohint version triplet. For example, hypothetical ttfautohint versions 2. If the pkg-config configuration file ttfautohint. Return the ttfautohint version string. The generic instructions should work just fine. Precompiled binaries ttfautohint. This means that the two programs are not dependent on any other program-specific DLL, and you can move them to any place you like.
Right now, only a precompiled binary ttfautohint is offered; a ready-to-run app bundle for the GUI version is not yet available; however, ttfautohint is part of Homebrew , making compilation and installation very simple. Support for Mongolian. The de-facto standard is to render the glyphs horizontally left-to-right line by line, then rotating each line clockwise by 90 degrees.
This allows the usage of ttfautohint. Bug fix: Glyphs with complicated shapes or a large number of outlines could be distorted if displayed with FreeType or stay unhinted if viewed on Windows. This supersedes option -g , which is now deprecated. Stem widths for the hinting process can now be manually set using the new width keyword in a control instructions file. These are necessary on some platforms if ttfautohint is compiled as a shared library, and the application uses a different runtime library.
Note that the used blue zone characters might not be optimal. Please report any problems so that I can fix issues! TrueType bytecode generated by ttfautohint now correctly supports most recent MS interpreter versions. A new option --reference and --reference-index to select a font within a TTC makes ttfautohint use the blue zones from another font.
This helps synchronize the ascenders and descenders of font families. Glyphs covered by the fallback script are now hinted by default. Previously, they were scaled only. The default fallback script none now implies hinting without script-specific blue zones but still aligning stems to the grid if possible. The new option --fallback-scaling changes the behaviour of the fallback script from hinting to scaling as implemented in previous versions.
This corresponds to the new library option epoch. Bug fix: Too many delta control instructions for a single glyph caused a bytecode stack overflow, making the MS rasterizer ignore all hinting instructions for this glyph. Bug fix: Under certain circumstances, glyph indices used in Indic features were incorrectly assigned to the default script. Better support for scripts that contain superscript-like and subscript-like glyphs, e. A new control instruction syntax form was added to adjust the mapping between glyphs and styles.
Right now, its usage is quite limited; a forthcoming version will give much more flexibility. Keywords in control instruction files can be more verbose to increase readability. Such deltas do work even with ClearType if applied to the non-ClearType direction. The amount of information about ttfautohint and its parameters that gets added to the name table by default has been reduced. A new option --detailed-info restores the previous behaviour. This can be useful during the development process: It helps the operating system to simultaneously display several instances of a font that are processed with different ttfautohint parameters.
The new library option info-post-callback helps in processing data from the name table. Right now, two modes are supported:. The idea is to dock ttfautohintGUI to your favourite font and text editor instead of adding a cheap text editor to ttfautohintGUI itself. With the new option --fallback-stem-width it is now possible to set a default stem width for all scripts that lack proper standard characters in the font. Add alias --adjust-subglyphs for option --pre-hinting to better describe its functionality.
The short form -p stays unchanged. Right now, this is mainly for archiving purposes. Forthcoming versions of ttfautohint will be able to re-use this data if a font gets re-processed. A harmless buglet was fixed that made the glyf table too large by one byte under some circumstances. New library options error-callback and error-callback-data for improved diagnostics.
Bug fixes in the computation of strong stem widths. GDI hinting now gives much more consistent results. Better recognition of script coverage: ttfautohint now properly scans composite glyphs to cover components also. Improved glyph shape analysis: Non-flat local extrema are now recognized more reliably, and stem detection works better. OpenType feature support. Related to this, the new option --default-script controls the default fallback script used for OpenType features.
More than a single standard character is used. Better handling of non-square pixels this is, horizontal and vertical resolutions differ in the created TrueType bytecode. Improved script support. Besides Cyrillic and Greek, which are now handled separately from Latin, ttfautohint can handle Hebrew. Option -f now takes a parameter to specify the fallback script. The corresponding long option name has been renamed from --latin-fallback to --fallback-script.
Work around a bug in display environments that use FreeType 2. Option --components has been replaced with --composites : By default, the components of a composite glyph are now hinted separately, since tests has shown that this gives good results in most cases. If this option is set, however, the composite glyph itself gets hinted and the hints of the components are ignored.
Since many printers contain this rasterizer without any possibility to update to a non-buggy version, ttfautohint now contains work-arounds to circumvent the problem. New option --dehint to strip off all hints without generating new hints. This option is intended for testing purposes.
Implement option --x-height-snapping-exceptions , making ttfautohint avoid x-height snapping for selected PPEM values. Useful in combination with --windows-compatibility. New option --components to treat components of composite glyphs separately. This greatly reduces the bytecode size. The command-line version of ttfautohint now acts like a Unix filter, this is, it accepts stdin and stdout as input and output, respectively.
If it is active, stem widths and positions are snapped to the grid as much as possible. A new command line option --debug not available for ttfautohintGUI to print very detailed debugging information. Use this option for symbol fonts or math glyphs. Option --ignore-permissions has been renamed to --ignore-restrictions.
The short form is still -i. Implement option -x to increase the x height of the font for small PPEM values by rounding up far more often then rounding down. This can be suppressed with option -n. The improved handling of composite glyphs in 0.
Implement option -p to pre-hint glyphs with original hints before conversion takes place. However, ttfautohint ignores the space.
The hinting logic is partly in the font and partly in. More sophisticated rasterizers are able to produce. The hinting logic is in the font;. The hinting logic is. No hints in the font are used or needed;. This is how FreeType's auto-hinter works; see. While it is relatively easy to specify PostScript hints either manually or.
There are at least two reasons:. They are comparable to assembler code, thus lacking all. Here an example how such code looks like:. Another major obstacle is the fact that font designers usually aren't. Given that the. The ttfautohint library brings the excellent quality of FreeType rendering.
Roughly speaking, it converts the glyph. Internally, the auto-hinter's algorithm resembles PostScript hinting. The simple interface of the front-ends both on the command line and with. As a result, you get better rendering results. Across Windows rendering environments today, fonts processed with. This is the default for. The goal of the project is to generate a 'first pass' of hinting that font.
Both the GUI and console version share the same features, to be discussed in. For this reason it is strongly. For demonstration purposes, here the same using a pipe and redirection. Long options can be given with one or two dashes, and with and without an. This means that the following forms. Below, the section title refers to the command's label in the GUI, then. Background and technical details on the meaning of the various options are. See ['Hint Sets'] hint-sets for a definition and explanation.
Note that hinting in the range 'hinting-range-max' up to 'hinting-limit'. Hinting Limit' box in the GUI. Since this will cause internal math. If this flag is set, values in the. The default. Use this flag to increase the legibility of small.
To switch off rounding the. FreeType's 'light' autohint mode which corresponds to ttfautohint's. A value range has the form. Whitespace is not significant; superfluous. The default is the empty string. Normally, x-height snapping means a slight increase in the overall. However, having larger vertical glyph sizes is not always.
See ['Windows Compatibility'] windows-compatibility. The idea is to help ttfautohint so that the hinted glyphs stay. Additionally, there is a. If ttfautohint is part of the font creation tool chain, and the font. Assuming a minimum hinting size of 6ppem, adding two pixels.
This is near to the default. For example, if the vertical extension of. In case ttfautohint is used as an auto-hinting tool for fonts which can. This makes only sense if your font already has some hints in it which. CJK fonts need this because the bytecode is used to scale and shift. Using this flag reduces the bytecode size enormously, however,. In the GUI it is similar: If you uncheck. If a font contains composite glyphs and those glyphs are hinted as a. Use this option. Except for testing and.
The former uses. These two routines are mapped onto three possible rendering targets:. ClearType is enabled e. Windows XP. Microsoft Windows are two completely different rendering engines. To use smooth stem width handling for. In the GUI, simply set the corresponding check box to select the stem. The following FontForge snapshot images use the font ['Mertz.
Note how the stems are aligned to the pixel. If you have a permission of the font's legal. Regarding the. The next few subsections are mainly based on this article, introducing some. Note that ttfautohint only does hinting along the.
Contour and control points are represented by squares and. The bottom 'line' DE is approximately aligned. The auto-hinter analyzes a font in two steps. Right now, everything. This affects the hinting of all glyphs, trying to give them a uniform. The values. If stem widths and heights of single glyphs differ by a large value, or.
The abovementioned. Vertical point coordinates of. Here a table which shows the characters used by the latin module; the values. ID Blue zone Characters. The 'round' characters e. It doesn't. This is the central routine of the auto-hinter; its actions are highly. Currently, only support for scripts which.
Such points are not part of an edge. This roughly. The following images illustrate the hinting process, using glyph 'a' from. Note that the hinting process. For each. For some. One of the hinting configuration parameters is the decision which segments. For example, let us assume that two segments get aligned on a. This change makes ttfautohint emit a new hint set to accomodate this.
The next images illustrate this, using a Cyrillic letter glyph 'afii'. Segments and are aligned on a. Obviously, the more hint sets get emitted, the larger the bytecode. If the value is too low, the hint. If the value is too high, the font size increases due to. For a given glyph, ttfautohint finds.
For ppem values below 10ppem, the. For ppem values larger than , no. By default, ttfautohint doesn't hint subglyphs of composite glyphs. Instead, it hints the whole glyph, this is, composites get. One problem, however, must be solved: Hinting for subglyphs which usually. The trick used by ttfautohint is to prepend a composite element called. The final bytecode of the composite glyph. After processing with. Some technical details which you might skip : All glyph point indices get.
This must be done for both the bytecode and one subformat of. While this approach works fine on all tested platforms, there is one single. Under normal circumstances this never happens because. To do so, it checks a glyph's Unicode character code. Currently, only FreeType's 'latin'. The command-line binary, ttfautohint, works like a Unix filter, this is, it reads data from standard input if no input file name is given, In the range given by the --hinting-range-min and --hinting-range-max options, ttfautohint creates hint sets for every PPEM value.
For each glyph, ttfautohint automatically determines whether a new set should be emitted for a PPEM value if it finds that The TTY binary, ttfautohint, works like a Unix filter, this is, Long options can be given with one or two dashes, and with and without an equal sign between option and argument. Below, the Saturday, 28 January Ttfautohint Binary Optionen ttfautohint 1.
Apple ttfautohint 1. Making mo
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