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https://github.com/tehreer/sheenfigure
An implementation of advanced typographic tables of OpenType specification.
https://github.com/tehreer/sheenfigure
ansi-c arabic-shaping c c-plus-plus c89 library opentype opentype-features opentype-fonts opentype-specification text-shaping typographic-tables unicode variable-fonts
Last synced: 27 days ago
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An implementation of advanced typographic tables of OpenType specification.
- Host: GitHub
- URL: https://github.com/tehreer/sheenfigure
- Owner: Tehreer
- License: apache-2.0
- Created: 2016-09-17T16:04:36.000Z (about 8 years ago)
- Default Branch: master
- Last Pushed: 2023-11-17T16:08:12.000Z (12 months ago)
- Last Synced: 2024-10-12T17:21:53.156Z (27 days ago)
- Topics: ansi-c, arabic-shaping, c, c-plus-plus, c89, library, opentype, opentype-features, opentype-fonts, opentype-specification, text-shaping, typographic-tables, unicode, variable-fonts
- Language: C
- Homepage:
- Size: 1.17 MB
- Stars: 31
- Watchers: 5
- Forks: 6
- Open Issues: 8
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
SheenFigure
=========
[](https://opensource.org/licenses/Apache-2.0)
[](https://travis-ci.org/Tehreer/SheenFigure)
[](https://coveralls.io/github/Tehreer/SheenFigure?branch=master)
SheenFigure aims to implement the advanced typographic tables of OpenType specification available at https://www.microsoft.com/en-us/Typography/OpenTypeSpecification.aspx along with script specific shaping engines available at https://www.microsoft.com/en-us/Typography/SpecificationsOverview.aspx. Currently, it only supports Arabic script and a subset of [GDEF](https://www.microsoft.com/typography/otspec/GDEF.htm), [GSUB](https://www.microsoft.com/typography/otspec/GSUB.htm) and [GPOS](https://www.microsoft.com/typography/otspec/GPOS.htm) tables. The support is intended to increase in each newer versions of the library.
Here are some of the advantages of SheenFigure.
* Object based
* Designed to be thread safe
* Lightweight API for interaction
* Clear differentiation of public and private API
* Thoroughly tested
## Dependency
SheenFigure only depends on [SheenBidi](https://github.com/mta452/SheenBidi) in order to support UTF-8, UTF-16 and UTF-32 string encodings. Other than that, it only uses standard C library headers ```stddef.h```, ```stdint.h```, ```stdlib.h``` and ```string.h```.
## Configuration
The configuration options are available in `Headers/SFConfig.h`.
* ```SF_CONFIG_UNITY``` builds the library as a single module and lets the compiler make decisions to inline functions.
## Compiling
SheenFigure can be compiled with any C compiler. The best way for compiling is to add all the files in an IDE and hit build. The only thing to consider however is that if ```SF_CONFIG_UNITY``` is enabled then only ```Source/SheenFigure.c``` should be compiled.
## Public API
Here is a glimpse of public API in the form of UML class diagram.
## Conformance
Following are the tables implemented by SheenFigure.
### OpenType Layout Common Table Formats
| Table | Supported |
|------------------ |:---------: |
| Script List | ✔️ |
| Feature List | ✔️ |
| Lookup List | ✔️ |
| Coverage | ✔️ |
| Class Definition | ✔️ |
| Device | ✔️ |
| Variation Index | ✔️ |
### GDEF (Glyph Definition Table)
| Subtable | Supported |
|---------------------------------- |:---------: |
| Glyph Class Definition | ✔️ |
| Attachment List | ❌ |
| Ligature Caret List | ❌ |
| Mark Attachment Class Definition | ✔️ |
| Mark Glyph Sets | ✔️ |
| Item Variation Store | ✔️ |
### GPOS (Glyph Positioning Table)
| Subtable | Format 1 | Format 2 | Format 3 |
|----------------------------- |:--------: |:--------: |:--------: |
| Single Adjustment | ✔️ | ✔️ | |
| Pair Adjustment | ✔️ | ✔️ | |
| Cursive Attachment | ✔️ | | |
| Mark To Base Attachment | ✔️ | | |
| Mark To Ligature Attachment | ✔️ | | |
| Mark To Mark Attachment | ✔️ | | |
| Context Positioning | ✔️ | ✔️ | ✔️ |
| Chained Context Positioning | ✔️ | ✔️ | ✔️ |
| Extension Positioning | ✔️ | | |
### GSUB (Glyph Substitution Table)
| Subtable | Format 1 | Format 2 | Format 3 |
|-------------------------- |:--------: |:--------: |:--------: |
| Single | ✔️ | ✔️ | |
| Multiple | ✔️ | | |
| Alternate | ✔️ | | |
| Ligature | ✔️ | | |
| Context | ✔️ | ✔️ | ✔️ |
| Chaining Context | ✔️ | ✔️ | ✔️ |
| Extension | ✔️ | | |
| Reverse Chaining Context | ✔️ | | |