compute_clip

Overview ¶

Command compute_clip is a visual demo exercising the Vello compute pipeline with clip layers.

It renders a scene with BeginClip/EndClip through the CPU reference implementation (tilecompute.RasterizeSceneDefPTCL) and optionally through the GPU compute pipeline, producing a triptych comparison image.

Scene layout:

• White background
• Green rectangle (full canvas)
• BeginClip: rounded-rectangle-approximated clip (centered, ~200x150)
• 8 colored circles inside clip (clipped to the rounded rect)
• Blue rectangle inside clip (partially clipped)
• EndClip
• Yellow star outside clip (fully visible, NOT clipped)

Output:

tmp/clip_cpu.png         — CPU reference
tmp/clip_gpu.png         — GPU compute output (if available)
tmp/clip_comparison.png  — Side-by-side triptych with diff