Show HN: Ruby-libgd – Native 2D graphics engine for Ruby (no CLI, no JavaScript)

[ggerman2025]

Hi HN,

I built *ruby-libgd*, a native Ruby binding to the libgd graphics library.

The goal is to provide a lightweight, in-process 2D graphics engine for Ruby — not an image manipulation wrapper, but a canvas-based drawing API with deterministic rendering.

Unlike tools like MiniMagick (which wrap ImageMagick CLI), ruby-libgd runs entirely in-process and exposes explicit drawing primitives: lines, shapes, text, fonts, colors, and pixel-level control.

Simple example:

```ruby img = GD::Image.new(400, 300) white = GD::Color.rgb(255, 255, 255) black = GD::Color.rgb(0, 0, 0)

img.rectangle(20, 20, 200, 150, black) img.text("Hello Ruby", x: 30, y: 40, color: black)

img.save("output.png")

[Borg3]

Something like this? http://borg.uu3.net/~borg/?gperf

This stuff is written in Ruby :)

[ggerman2025]

Not exactly.

That link looks like a Ruby-level drawing demo (and I don’t see a public repo or docs behind it).

ruby-libgd is a native, in-process binding to libgd, focused on deterministic rendering and explicit pixel-level primitives, released under the MIT license.

On top of that, I built libgd-gis (also MIT) as a higher-level standard: map rendering, GeoJSON ingestion, layers, tiles, and reproducible output for GIS-style workloads.

ruby-libgd is the low-level graphics engine; libgd-gis is the map renderer built on it.