fix(cua-driver): add DPI awareness manifest for Windows

[ddupont808]

Summary

• Adds DPI awareness manifest to cua-driver.exe on Windows
• Fixes coordinate offset bug when using 125%/150%/200% display scaling

Problem

Users reported that x/y coordinates were offset when running cua-driver-rs on Windows with 125% display scaling. This happened because Windows treats processes without a DPI manifest as DPI-unaware and provides physical pixels instead of logical pixels.

Without the manifest:

• At 125% scaling, clicking logical (100, 100) would land at physical (125, 125)
• Screenshot coordinates wouldn't match click coordinates
• The cua-driver-uia.exe worker had the manifest, but the main daemon didn't

Solution

Added a Windows application manifest declaring Per-Monitor V2 DPI awareness (matching cua-driver-uia.exe). This ensures:

• Windows provides logical coordinates (what the user sees)
• Coordinates match screenshot pixel positions
• No scaling mismatch between daemon and worker

The manifest is embedded at build time via embed-resource crate (Windows-only build dependency).

Test plan

• Build on Windows with 125% scaling
• Verify clicks land at correct positions
• Verify no regression on 100% scaling
• Confirm build still succeeds on macOS/Linux (manifest is Windows-only)

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Integrated DPI-awareness configuration into the Windows driver build process, enabling proper display scaling and rendering on high-resolution monitors.

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	Jun 5, 2026 1:31am

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📝 Walkthrough

Walkthrough

The PR adds Windows DPI awareness support to the cua-driver crate by introducing a Windows application manifest, declaring the embed-resource build dependency, and configuring the build script to embed the manifest at compile time.

Changes

Windows DPI Awareness Setup

Layer / File(s)	Summary
Manifest, build dependency, and embedding libs/cua-driver/rust/crates/cua-driver/cua-driver.manifest, libs/cua-driver/rust/crates/cua-driver/Cargo.toml, libs/cua-driver/rust/crates/cua-driver/build.rs	New cua-driver.manifest defines Windows DPI-awareness settings for the com.trycua.driver assembly with asInvoker execution level and both legacy and per-monitor V2 DPI awareness. Cargo.toml declares the embed-resource = "2" build dependency. build.rs adds Windows-specific logic to compile and embed the manifest using embed_resource::compile.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A manifest bright for Windows to see,
DPI awareness, crisp and free!
Embed the resource, build it with care,
High-res displays treated fair and square.
Rust and resources, a bunny's delight! 🪟✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding a DPI awareness manifest for Windows to the cua-driver crate. It is concise, specific, and clearly reflects the primary objective of the PR.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/windows-dpi-awareness

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@libs/cua-driver/rust/crates/cua-driver/build.rs`:
- Line 16: The build script currently calls
embed_resource::compile("cua-driver.manifest", ...) which is wrong because
embed_resource::compile expects a Windows .rc resource script, not a raw
.manifest; create a resource script named cua-driver.rc containing the
RT_MANIFEST definition and reference to the XML manifest (e.g., "`#define`
RT_MANIFEST 24" and "1 RT_MANIFEST \"cua-driver.manifest\""), then update the
call to embed_resource::compile("cua-driver.rc", embed_resource::NONE) so the
manifest is embedded correctly by the embed_resource::compile function.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 406ee2f2-642b-4c02-b60b-bddcdd5a641c

📥 Commits

Reviewing files that changed from the base of the PR and between 02fdd98 and 61d3ef2.

📒 Files selected for processing (3)

• libs/cua-driver/rust/crates/cua-driver/Cargo.toml
• libs/cua-driver/rust/crates/cua-driver/build.rs
• libs/cua-driver/rust/crates/cua-driver/cua-driver.manifest