Gaussian Filter - Edge NN-padding support and QA test updates

[r-abishek]

This PR adds nearest neighbors padding for gaussian filter augmentation.
This is similar to the fixes in box/median already in ToT.
Current gaussian filter ToT version had border pixels fading out without NN padding, the PR attempts to fix the same.

Performance profiling to ensure no significant changes in performance due to addition of computation on nearest neighbor padding.
(Significant performance boost in the F32 PKD3 HIP variant observed)

• Add updated QA support for testing the HOST and HIP Backends for various layout types - F32 test support introduced, U8 test support updated.
• Update the compute functions for gaussian filter to use fmadd on HOST Backend.
• Template the load filter functions significantly on HOST Backend - 36 helper functions reduced to 3 templated functions.
• Introduce enums to refer to a particular image border-edge (left, right, bottom and top edges)
• Separate the compute functions of all bit depths on HIP Backend (Avoids additional bit depth conversions)
• HIP Backend upgrades also help in performance improvements of specific F32 variants compared to existing ToT version : Specifically 37% - 82% for kernel Sizes 5,7 and 9 for PKD3 variants.

[Copilot]

Pull Request Overview

This PR adds nearest-neighbor padding support for the Gaussian filter augmentation to prevent border pixels from fading out. The changes include API updates, kernel optimizations for both HIP and HOST backends, and enhanced QA test support.

Key Changes

• Added borderType parameter to gaussian filter API functions with REPLICATE (nearest-neighbor) support
• Introduced RpptImageBorderEdge enum for identifying image border edges
• Templated helper functions on HIP backend (reduced from 36 functions to 3 templated functions)
• Updated QA test suite to enable gaussian filter testing for F32 and U8 formats
• Performance optimizations showing 37-82% improvement for specific F32 PKD3 variants on kernel sizes 5, 7, and 9

Reviewed Changes

Copilot reviewed 9 out of 22 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
api/rppt_tensor_filter_augmentations.h	Added borderType parameter to gaussian filter API signatures
api/rppdefs.h	Introduced RpptImageBorderEdge enum for edge identification
utilities/test_suite/rpp_test_suite_image.h	Removed GAUSSIAN_FILTER from nonQACases to enable QA testing
utilities/test_suite/HOST/Tensor_image_host.cpp	Added borderType validation and parameter passing
utilities/test_suite/HIP/Tensor_image_hip.cpp	Added borderType validation and parameter passing
src/modules/tensor/rppt_tensor_filter_augmentations.cpp	Added borderType parameter validation
src/modules/tensor/hip/kernel/gaussian_filter.cpp	Major refactoring with templated functions and NN padding logic
src/modules/tensor/cpu/kernel/gaussian_filter.cpp	Enhanced with templated load functions and padding support
src/include/common/cpu/rpp_cpu_simd_load_store.hpp	Added store24 functions for various data types
docs/data/doxygenOutputs/*.png	Updated documentation images

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[Copilot]

The condition id_x_i > roiBeginX uses strict inequality, but should use >= for proper boundary checking. When id_x_i == roiBeginX, this is a valid position that doesn't need padding, but the current condition forces it into the padding path.

Suggested change

	if ((id_x_i > roiBeginX) && ((id_x_i + 7 + padLength) < roiWidth) && (id_y_i > roiBeginY) && (id_y_i < roiHeight))
	if ((id_x_i >= roiBeginX) && ((id_x_i + 7 + padLength) < roiWidth) && (id_y_i > roiBeginY) && (id_y_i < roiHeight))

[Srihari-mcw]

Resolved

[codecov]

Codecov Report

❌ Patch coverage is 96.64804% with 12 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/modules/tensor/cpu/kernel/gaussian_filter.cpp	90.98%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #639      +/-   ##
===========================================
- Coverage    88.33%   88.13%   -0.19%     
===========================================
  Files          195      195              
  Lines        82723    82479     -244     
===========================================
- Hits         73068    72692     -376     
- Misses        9655     9787     +132     

Files with missing lines	Coverage Δ
api/rppdefs.h	71.72% <ø> (ø)
src/include/common/cpu/rpp_cpu_filter.hpp	100.00% <100.00%> (ø)
src/include/common/cpu/rpp_cpu_simd_load_store.hpp	93.04% <100.00%> (-0.67%)	⬇️
src/modules/tensor/hip/kernel/gaussian_filter.cpp	99.71% <ø> (ø)
...odules/tensor/rppt_tensor_filter_augmentations.cpp	97.95% <100.00%> (+0.01%)	⬆️
src/modules/tensor/cpu/kernel/gaussian_filter.cpp	85.49% <90.98%> (+0.17%)	⬆️

... and 4 files with indirect coverage changes

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[kiritigowda]

@r-abishek please resolve conflicts

[rrawther]

@SundarRajan28 : Would like to review this PR with you before merging