Contact person: Fix iOS Canvas Scaling (Metal/PencilKit) for 300-DPI True-Size Exports

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Location: Faisalabad, Pakistan

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"Our iPad / iPhone design app (Swift + UIKit/SwiftUI, PencilKit, and Metal) still shrinks large canvases even though I already implemented a 3 × 3 tiled renderer (each tile 4096 × 4096). A 70 × 70 cm canvas set to 300 DPI should remain 8 267 × 8 267 px, yet at runtime the view slips to ~3 637 × 3 637 px. I have confirmed that no warnings or errors surface in the logs; the fault appears to sit squarely in the view-rendering path where an old UIKit fallback cap (~1 638 × 1 638 px) is still applied.

What I need from you
• Trace and eliminate every code path that introduces hidden down-scaling, whether in the CATiledLayer-backed view, the Metal layer, or any intermediate UIImage/Core Graphics bridge.
• Prove that the canvas renders on-screen at full resolution and that exported PNG/PDF assets preserve the exact 8 267 × 8 267 px dimensions.
• Keep the existing Metal tiling grid intact, bypassing per-texture limits on devices that support it, while gracefully degrading on older hardware.

Acceptance check
If I open the app on any current iPhone or iPad, draw, and export, the resulting file must read 8 267 × 8 267 px in Preview without any scaling metadata, and a physical print at 300 DPI must measure exactly 70 × 70 cm.

Relevant stack
Swift 5.x, UIKit/SwiftUI hybrid views, PencilKit input, Metal texture tiling, CATiledLayer, PDFKit (for export).

All code is available in a private repo and builds with Xcode 15. Once the precision issue is gone, I’ll run a final print test and sign off the milestone." (client-provided description)