Module cpu 

The CPU render lane (L0 fallback).

• scissor — the rect scissor geometry (moved from map3d in Phase A).
• sdf — the CPU SDF coverage + thick-AA-line raster math (the source of truth the GPU sdf.wgsl/line.wgsl mirror).
• CpuCanvas — collects QuadInstance/LineInstance batches and rasterizes them onto a vello_cpu Pixmap via the sdf coverage math, producing a straight-RGBA8 frame. It implements the L0 Canvas seam; CpuRenderer implements Renderer.

Re-exports

pub use scissor::clip_poly_to_rect;

pub use scissor::ink_outside_rect;

Modules

scissor

The CPU rect scissor — geometry-level clipping of triangles to a widget rect, the “ink never escapes the rect” guarantee.

sdf

CPU SDF coverage + AA-line raster — the L0 fallback that produces the same pixels as the GPU pipeline ([super::super::gpu::sdf_pipeline]).

Structs

CpuCanvas

A CPU canvas: an off-screen Pixmap (the vello_cpu raster target, per the CONS-CORE spec) plus the batched SDF instances drawn onto it. The host pushes quads + lines, then CpuCanvas::rasterize evaluates the sdf coverage for every instance over its bounding box and alpha-composites it into the pixmap.

CpuRenderer

The CPU Renderer — begin opens a CpuCanvas sized to the rect, present rasterizes it to a Frame. Headless / device / CI; always available (no GPU).