This is a tool for inspecting the outline geometry of glyphs. It uses FreeType to read font files and extract glyph data via FT_Outline_Decompose.
The file outline.c contains code that interfaces with FreeType and shields clients from its complexities.
Clients just include outline.h, define outline callbacks, include outline.c, and call a function outline:
const char *outline(int g, const char *font, int size, void *data)
where g is the Unicode character id, if positive, or the glyph id in the font, if negative; font is a path to a font file; size is the scale of the glyph, and data is passed on to the outline callbacks. The function returns NULL if there are no errors; otherwise, it returns the name of the FreeType function that failed.
There is a simple client in main.c, which can be used as a template or in a pipe for further processing. To build it, make test.
There is a Lua client in fd.c, which leaves the processing to a script.
As a demo, ps.lua outputs PostScript disections of glyphs. See the image below.
This module can also be built as a shared library for Lua named outline.so with make so.
Before building, set the locations of FreeType headers and library in Makefile. The default there assumes a link to the FreeType source tree.
This code is hereby placed in the public domain and also under the MIT license.
