Optimize Memory Usage and Add Cancellation Support in TesseractOcrEngine and ServiceConfiguration

[DrHazemAli]

This pull request introduces key optimizations and enhancements to improve memory handling and performance across two files: shared/Ocr/Tesseract/TesseractOcrEngine.cs and shared/ServiceConfiguration.cs.

• Memory Efficiency in OCR: Updated ExtractTextFromImageAsync in TesseractOcrEngine to use buffered copying, minimizing memory spikes during large image processing. Implemented IDisposable to ensure proper resource cleanup of TesseractEngine.
• Enhanced Cancellation Support: Added CancellationToken handling in ExtractTextFromImageAsync, allowing for responsive task cancellation.
• Optimized GetServiceInstance<T>: Modified the service resolution approach in ServiceConfiguration.cs to avoid redundant IServiceCollection cloning, instead configuring services within a scoped lifecycle. This reduces memory usage by minimizing instance duplication and leverages dependency injection more efficiently.

Motivation and Context

1. Why this change is required: This change enhances memory efficiency, supports cancellation during OCR extraction, ensures proper resource cleanup in TesseractOcrEngine, and optimizes service resolution in GetServiceInstance<T>.
2. Problem it solves: Reduces memory usage during OCR processing of large files, improves response to cancellation requests, and prevents redundant service instantiation, which reduces overhead in dependency injection.
3. Scenarios: Improves performance and memory handling, particularly for large image files in OCR, optimizes service instance management and avoid unexpected crashes.
4. Fixes an open issue: Yet, No existing issues related to this.

Description

1. Memory Optimization in ExtractTextFromImageAsync (shared/Ocr/Tesseract/TesseractOcrEngine.cs): Introduced buffered copy to handle large images more efficiently, minimizing memory usage during image processing.
2. Cancellation Support: Updated ExtractTextFromImageAsync to handle cancellationToken properly by passing it into CopyToAsync and handling OperationCanceledException.
3. Resource Cleanup with IDisposable: Implemented IDisposable in TesseractOcrEngine to ensure TesseractEngine resources are disposed when the instance is no longer needed.
4. Optimized GetServiceInstance<T> (shared/ServiceConfiguration.cs): Reduced memory footprint by avoiding redundant IServiceCollection cloning and copying. Instead, services are configured within a scoped lifecycle to minimize memory overhead and prevent unnecessary duplication in dependency injection.
5. Stream Position Reset: Reset the memory stream position after copying to enable seamless image loading.

Checklist

• The code builds clean without any errors or warnings.
• The PR follows the Contribution Guidelines and the pre-submission formatting script raises no violations.
• All unit tests pass.
• I didn't break anyone 😄

@dependabot rebase

[DrHazemAli]

This PR improves memory handling and resource management across the TesseractOcrEngine and ServiceConfiguration components. Key optimizations include buffered copying for large image processing, enhanced cancellation support, efficient disposal of resources, and optimized service instance resolution. These changes contribute to more efficient memory usage, better responsiveness, and improved dependency injection practices.

[DrHazemAli]

@microsoft-github-policy-service agree company="Skytells, Inc."

[DrHazemAli]

@dependabot rebase

[DrHazemAli]

Reviewed

[DrHazemAli]

Rechecked ✅