34 lines
1.3 KiB
Markdown
34 lines
1.3 KiB
Markdown
# Pathfinder
|
|
|
|
Pathfinder is a fast, practical GPU-based rasterizer for OpenType fonts using OpenGL 4.3. It
|
|
features:
|
|
|
|
* Very low setup time. Glyph outlines can go from the `.otf` file to the GPU in a form ready for
|
|
rasterization in less than a microsecond. There is no expensive tessellation or preprocessing
|
|
step.
|
|
|
|
* High quality antialiasing. Unlike techniques that rely on multisample antialiasing, Pathfinder
|
|
computes exact fractional trapezoidal area coverage on a per-pixel basis.
|
|
|
|
* Fast rendering, even at small pixel sizes. On typical systems, Pathfinder should easily exceed
|
|
the performance of the best CPU rasterizers.
|
|
|
|
* Low memory consumption. The only memory overhead over the glyph and outline storage itself is
|
|
that of a coverage buffer which typically consumes somewhere between 4MB-16MB and can be
|
|
discarded under memory pressure. Outlines are stored on-GPU in a compressed format and usually
|
|
take up only a few dozen kilobytes.
|
|
|
|
* Portability to most GPUs manufactured in the last few years, including integrated GPUs.
|
|
|
|
## Authors
|
|
|
|
The primary author is Patrick Walton (@pcwalton), with contributions from the Servo development
|
|
community.
|
|
|
|
The code is owned by the Mozilla Foundation.
|
|
|
|
## License
|
|
|
|
Licensed under the same terms as Rust itself. See `LICENSE-APACHE` and `LICENSE-MIT`.
|
|
|