Add missing SolvePnPMethod enum values (AP3P, IPPE, IPPE_SQUARE, SQPNP)

[shimat]

Summary

Fixes #1895.

The SolvePnPMethod enum was missing the last 4 values defined in OpenCV's
calib3d.hpp. This PR adds them to match the OpenCV 4.13.0 definition:

• AP3P = 5
• IPPE = 6
• IPPE_SQUARE = 7
• SQPNP = 8

Each value includes an XML doc comment referencing the corresponding paper,
consistent with the existing entries.

Reference: https://github.com/opencv/opencv/blob/4.13.0/modules/calib3d/include/opencv2/calib3d.hpp#L563

Notes

The obsolete SolvePnPFlags enum (marked [Obsolete(..., true)], which is a
compile-time error) was intentionally left unchanged, since it is no longer usable.

Test

dotnet build src/OpenCvSharp/OpenCvSharp.csproj -c Release succeeds with 0 errors
(net8.0 / netstandard2.0 / netstandard2.1).

Summary by CodeRabbit

• New Features
  • Extended camera pose estimation capabilities with four new algorithms: AP3P, IPPE, IPPE_SQUARE, and SQPNP for improved flexibility in solving perspective-n-point problems.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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Review profile: CHILL

Plan: Pro

Run ID: cad6026b-ac49-44b7-a5de-13276d9b036b

📥 Commits

Reviewing files that changed from the base of the PR and between 6521669 and 0d57c6b.

📒 Files selected for processing (1)

• src/OpenCvSharp/Modules/calib3d/Enum/SolvePnPFlags.cs

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📝 Walkthrough

Walkthrough

Four new members (AP3P = 5, IPPE = 6, IPPE_SQUARE = 7, SQPNP = 8) with XML documentation are appended to the SolvePnPMethod enum in SolvePnPFlags.cs, aligning the enum with the OpenCV 4.13 calib3d header. No logic or existing members are modified.

Changes

SolvePnPMethod Enum Extension

Layer / File(s)	Summary
New SolvePnPMethod enum members src/OpenCvSharp/Modules/calib3d/Enum/SolvePnPFlags.cs	Appends AP3P = 5, IPPE = 6, IPPE_SQUARE = 7, and SQPNP = 8 with XML doc comments to SolvePnPMethod, matching OpenCV 4.13's SOLVEPNP_* constants.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• shimat/opencvsharp#1819: Updates SolvePnP/SolvePnPRansac overloads to accept SolvePnPMethod instead of SolvePnPFlags, directly connected to the same enum's API surface being extended here.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and specifically describes the main change: adding four missing enum values to SolvePnPMethod.
Linked Issues check	✅ Passed	The PR fully addresses issue #1895 by adding all four missing enum values (AP3P=5, IPPE=6, IPPE_SQUARE=7, SQPNP=8) with XML documentation.
Out of Scope Changes check	✅ Passed	All changes are directly scoped to adding the four missing enum values to SolvePnPMethod; no unrelated modifications are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/solvepnp-enum-missing-values

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