mirror of https://github.com/freetype/freetype
8f286c86ef
This commit adds support for kerning from 'GPOS' tables, while maintaining support for basic 'kern' tables. `FT_HAS_KERNING` will be true for a font with either available and `FT_Get_Kerning` will still use the basic 'kern' table data if avilable, otherwise check the GPOS 'kern' feature. This feature is disabled by default; it can be enabled with the `TT_CONFIG_OPTION_GPOS_KERNING` flag. Only basic kerning (pair positioning with just an x advance) is supported from the GPOS layout features; support for that was added to make the existing `FT_Get_Kerning` API more consistently functional. FreeType does not intend to extend itself to further GPOS functionality though; a higher-level library like HarfBuzz can be used instead for that. * include/freetype/config/ftoption.h, include/devel/ftoption.h (TT_CONFIG_OPTION_GPOS_KERNING): New configuration option. * include/freetype/internal/fttrace.h: Add `ttgpos` trace handler. * include/freetype/internal/sfnt.h (SFNT_Interface): Add `load_gpos` and `get_gpos_kerning` fields. (FT_DEFINE_SFNT_INTERFACE): Updated. * include/freetype/internal/tttypes.h: Include `fttypes.h`. (TT_FaceRec) [TT_CONFIG_OPTION_GPOS_KERNING]: Add `gpos_table` and `gpos_kerning_available` fields. * src/sfnt/ttgpos.c, src/sfnt/ttgpos.h: New files. * src/sfnt/sfdriver.c [TT_CONFIG_OPTION_GPOS_KERNING]: Include `ttgpos.h`. (sfnt_interface): Updated. * src/sfnt/sfnt.c: Include `ttgpos.c`. * src/sfnt/sfobjs.c [TT_CONFIG_OPTION_GPOS_KERNING]: Include `ttgpos.h`. (sfnt_load_face) [TT_CONFIG_OPTION_GPOS_KERNING]: Load and free GPOS kerning data; check GPOS kerning availability. * src/truetype/ttdriver.c (tt_get_kerning): Use GPOS kerning if there's no 'kern' table. |
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| .. | ||
| markdown | ||
| oldlogs | ||
| .gitignore | ||
| CHANGES | ||
| CMAKE | ||
| CUSTOMIZE | ||
| DEBUG | ||
| DOCGUIDE | ||
| FTL.TXT | ||
| GPLv2.TXT | ||
| INSTALL | ||
| INSTALL.ANY | ||
| INSTALL.CROSS | ||
| INSTALL.GNU | ||
| INSTALL.MAC | ||
| INSTALL.UNIX | ||
| INSTALL.VMS | ||
| MAKEPP | ||
| PROBLEMS | ||
| README | ||
| TODO | ||
| VERSIONS.TXT | ||
| formats.txt | ||
| freetype-config.1 | ||
| freetype-web.txt | ||
| raster.txt | ||
| release | ||
README
After saying `make refdoc' or `make refdoc-venv' the `reference/' directory
contains the FreeType API reference. You need Python >= 3.5 and pip to make
this target.
There are two ways to generate the documentation:
1. Using `make refdoc':
- Ensure `python' and `pip' are available.
- Install pip package `docwriter' with `pip install --user docwriter'.
- Make target with `make refdoc'.
- This target can be run offline once required packages are installed.
2. Using `make refdoc-venv' (requires internet access):
- Ensure `python', `pip' and Python package `virtualenv' are available.
- Make target with `make refdoc-venv'.
- This may or may not require internet access every time depending on
pip and system caching.
Some troubleshooting tips:
* Regularly run `pip install --upgrade docwriter' to check for updates which
may include bug fixes.
* `Docwriter' does not support Python 2. Ensure that Python >= 3.5 is
installed and available as `python3'/`python'.
* Ensure that `docwriter' is installed in the same Python target that
`make refdoc' uses (python3/python).
* If none of this works, send a mail to `freetype-devel@nongnu.org' or file
an issue at `https://github.com/freetype/docwriter/issues'.