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SVGV: Designing an Ultra-Compact Binary Vector Serialization Format for CNC G-Code
Category: Software Engineering • Published: 2026-08-27 • By Muhammad Ali
Standard 2D vector exchange formats like SVG and AutoCAD DXF are horribly inefficient. An SVG file containing complex parametric curves is bloated with human-readable XML tags, verbose floating-point strings (`d="M 124.58291 948.12849 C 129.482..."`), and duplicate whitespace.
A high-density relief file easily balloons to $45\text{ MB}$, causing memory bottlenecks on low-power microcontrollers.
### The SVGV Binary Specification
To solve this for our distributed CAD factory, we engineered **SVGV (Scalable Vector Geometry Vectorized)**, a compact binary container:
1. **Header (8 Bytes):** Magic bytes `0x53 0x56 0x47 0x56` ('SVGV'), format version, bounding box coordinates encoded as four 16-bit integers.
2. **Command Opcode Byte:**
- `0x01`: Linear Move (`G00` Rapid)
- `0x02`: Linear Cut (`G01` Feed)
- `0x03`: Clockwise Arc (`G02` with center I/J offsets)
- `0x04`: Counter-Clockwise Arc (`G03`)
- `0x05`: Cubic Bezier Spline
3. **Coordinate Deltas:** Coordinates are stored as signed 16-bit integer deltas relative to the previous point, scaled to $0.001\text{ mm}$ precision.
### The Real-World Compression Yield
A $14.2\text{ MB}$ DXF architectural jali panel encodes into a **$1.8\text{ MB}$ SVGV file**—an **$87.3\%$ reduction** in payload size with zero loss in mathematical contour fidelity.