[AI Task] [Tizen.Multimedia.Camera] Remove params allocation from Camera.ValidateState

[JoonghyunCho]

Summary

Split Camera.ValidateState(params CameraState[]) into explicit 1-arg and 2-arg overloads to eliminate the per-call CameraState[] allocation plus LINQ Contains enumerator at every camera state guard.

Changes

• src/Tizen.Multimedia.Camera/Camera/Camera.cs
  • Replace internal void ValidateState(params CameraState[] required) with two non-allocating overloads ((CameraState) and (CameraState, CameraState)).
  • Extract the exception path into a private static ThrowInvalidState helper that keeps the original params-based formatting so the thrown message is byte-identical.
• All 10 existing call sites (8 in Camera.cs, 2 in Camera.Properties.cs) pass exactly 1 or 2 constants and now bind to the new overloads without any change at the call site.

Mode

Refactoring

Verification

• Build: passed (dotnet build on src/Tizen.Multimedia.Camera, 0 errors)
• Tests: N/A
• Benchmark: skipped (no sdb device available in this run; manual verification recommended on target)

Fixes #7623

[gemini-code-assist]

Code Review

This pull request refactors the ValidateState method in Camera.cs to avoid array allocations by replacing the params array parameter with specific overloads for one or two CameraState arguments, and extracting the exception throwing logic into a helper method. The review feedback suggests marking the exception-throwing helper method with [MethodImpl(MethodImplOptions.NoInlining)] to optimize JIT inlining for the validation methods.

[gemini-code-assist]

To ensure that the hot-path validation methods (ValidateState) are highly eligible for JIT inlining, it is a recommended practice to mark the exception-throwing helper method with [MethodImpl(MethodImplOptions.NoInlining)]. This keeps the caller's code size small and avoids the overhead of the exception-throwing logic being considered during inlining decisions.

        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
        private static void ThrowInvalidState(CameraState curState, params CameraState[] required) =>
            throw new InvalidOperationException($"The camera is not in a valid state. " +
                $"Current State : { curState }, Valid State : { string.Join(", ", required) }.");