From 4220f7e88571dd80f7f4c49d41bdf669a9b0f7d5 Mon Sep 17 00:00:00 2001
From: Jay Cho <chojoong@gmail.com>
Date: Sun, 2 Aug 2026 20:04:22 +0900
Subject: [PATCH] Refactor: Pre-size MediaVision result lists with known native
 count (Fixes #7700)

The five Inference*Result constructors and four legacy GetResults helpers
read the exact element count from native code but built their List<T>
with default capacity, causing repeated backing-array reallocations on
the per-frame hot path. Pass the known count/number as the initial
capacity so a single right-sized array is allocated. List contents and
order are unchanged.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---
 src/Tizen.Multimedia.Vision/MediaVision/FaceDetector.cs         | 2 +-
 .../MediaVision/FacialLandmarkDetector.cs                       | 2 +-
 src/Tizen.Multimedia.Vision/MediaVision/ImageClassifier.cs      | 2 +-
 .../MediaVision/InferenceFaceDetectorResult.cs                  | 2 +-
 .../MediaVision/InferenceFacialLandmarkDetectorResult.cs        | 2 +-
 .../MediaVision/InferenceImageClassifierResult.cs               | 2 +-
 .../MediaVision/InferenceObjectDetectorResult.cs                | 2 +-
 .../MediaVision/InferencePoseLandmarkDetectorResult.cs          | 2 +-
 src/Tizen.Multimedia.Vision/MediaVision/ObjectDetector.cs       | 2 +-
 9 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/src/Tizen.Multimedia.Vision/MediaVision/FaceDetector.cs b/src/Tizen.Multimedia.Vision/MediaVision/FaceDetector.cs
index d9bc59253a6..e6abe42492e 100755
--- a/src/Tizen.Multimedia.Vision/MediaVision/FaceDetector.cs
+++ b/src/Tizen.Multimedia.Vision/MediaVision/FaceDetector.cs
@@ -188,7 +188,7 @@ private static IEnumerable<FaceDetectionResult> GetResults(int number, float[] c
                 return Enumerable.Empty<FaceDetectionResult>();
             }
 
-            var results = new List<FaceDetectionResult>();
+            var results = new List<FaceDetectionResult>(number);
 
             for (int i = 0; i < number; i++)
             {
diff --git a/src/Tizen.Multimedia.Vision/MediaVision/FacialLandmarkDetector.cs b/src/Tizen.Multimedia.Vision/MediaVision/FacialLandmarkDetector.cs
index 27f53c49cff..32ac9e41965 100755
--- a/src/Tizen.Multimedia.Vision/MediaVision/FacialLandmarkDetector.cs
+++ b/src/Tizen.Multimedia.Vision/MediaVision/FacialLandmarkDetector.cs
@@ -126,7 +126,7 @@ private static IEnumerable<Point> GetResults(int number, global::Interop.MediaVi
                 return Enumerable.Empty<Point>();
             }
 
-            var results = new List<Point>();
+            var results = new List<Point>(number);
 
             for (int i = 0; i < number; i++)
             {
diff --git a/src/Tizen.Multimedia.Vision/MediaVision/ImageClassifier.cs b/src/Tizen.Multimedia.Vision/MediaVision/ImageClassifier.cs
index 8b71f375704..4fa689f7631 100755
--- a/src/Tizen.Multimedia.Vision/MediaVision/ImageClassifier.cs
+++ b/src/Tizen.Multimedia.Vision/MediaVision/ImageClassifier.cs
@@ -122,7 +122,7 @@ private static IEnumerable<ImageClassificationResult> GetResults(int number, int
                 return Enumerable.Empty<ImageClassificationResult>();
             }
 
-            var results = new List<ImageClassificationResult>();
+            var results = new List<ImageClassificationResult>(number);
 
             for (int i = 0; i < number; i++)
             {
diff --git a/src/Tizen.Multimedia.Vision/MediaVision/InferenceFaceDetectorResult.cs b/src/Tizen.Multimedia.Vision/MediaVision/InferenceFaceDetectorResult.cs
index 7050d37226c..bcd8c56770e 100755
--- a/src/Tizen.Multimedia.Vision/MediaVision/InferenceFaceDetectorResult.cs
+++ b/src/Tizen.Multimedia.Vision/MediaVision/InferenceFaceDetectorResult.cs
@@ -32,7 +32,7 @@ internal InferenceFaceDetectorResult(IntPtr handle)
                 Validate("Failed to get result count.");
 
             RequestId = requestId;
-            var boundingBoxes = new List<Rectangle>();
+            var boundingBoxes = new List<Rectangle>((int)count);
 
             for (uint i = 0 ; i < count ; i++)
             {
diff --git a/src/Tizen.Multimedia.Vision/MediaVision/InferenceFacialLandmarkDetectorResult.cs b/src/Tizen.Multimedia.Vision/MediaVision/InferenceFacialLandmarkDetectorResult.cs
index 67b7b752ac8..f8da9a2f165 100755
--- a/src/Tizen.Multimedia.Vision/MediaVision/InferenceFacialLandmarkDetectorResult.cs
+++ b/src/Tizen.Multimedia.Vision/MediaVision/InferenceFacialLandmarkDetectorResult.cs
@@ -33,7 +33,7 @@ internal InferenceFacialLandmarkDetectorResult(IntPtr handle)
                 Validate("Failed to get result count.");
 
             RequestId = requestId;
-            var points = new List<Point>();
+            var points = new List<Point>((int)count);
 
             for (uint i = 0 ; i < count ; i++)
             {
diff --git a/src/Tizen.Multimedia.Vision/MediaVision/InferenceImageClassifierResult.cs b/src/Tizen.Multimedia.Vision/MediaVision/InferenceImageClassifierResult.cs
index 70b59184c68..a18b2aacd89 100755
--- a/src/Tizen.Multimedia.Vision/MediaVision/InferenceImageClassifierResult.cs
+++ b/src/Tizen.Multimedia.Vision/MediaVision/InferenceImageClassifierResult.cs
@@ -33,7 +33,7 @@ internal InferenceImageClassifierResult(IntPtr handle)
                 Validate("Failed to get result count.");
 
             RequestId = requestId;
-            var labels = new List<string>();
+            var labels = new List<string>((int)count);
 
             for (uint i = 0 ; i < count ; i++)
             {
diff --git a/src/Tizen.Multimedia.Vision/MediaVision/InferenceObjectDetectorResult.cs b/src/Tizen.Multimedia.Vision/MediaVision/InferenceObjectDetectorResult.cs
index 090031aa46a..f4e14a70f95 100755
--- a/src/Tizen.Multimedia.Vision/MediaVision/InferenceObjectDetectorResult.cs
+++ b/src/Tizen.Multimedia.Vision/MediaVision/InferenceObjectDetectorResult.cs
@@ -32,7 +32,7 @@ internal InferenceObjectDetectorResult(IntPtr handle)
                 Validate("Failed to get result count.");
 
             RequestId = requestId;
-            var boundingBoxes = new List<Rectangle>();
+            var boundingBoxes = new List<Rectangle>((int)count);
 
             for (uint i = 0 ; i < count ; i++)
             {
diff --git a/src/Tizen.Multimedia.Vision/MediaVision/InferencePoseLandmarkDetectorResult.cs b/src/Tizen.Multimedia.Vision/MediaVision/InferencePoseLandmarkDetectorResult.cs
index d7c9c16d713..51f355db0ea 100755
--- a/src/Tizen.Multimedia.Vision/MediaVision/InferencePoseLandmarkDetectorResult.cs
+++ b/src/Tizen.Multimedia.Vision/MediaVision/InferencePoseLandmarkDetectorResult.cs
@@ -33,7 +33,7 @@ internal InferencePoseLandmarkDetectorResult(IntPtr handle)
                 Validate("Failed to get result count.");
 
             RequestId = requestId;
-            var points = new List<Point>();
+            var points = new List<Point>((int)count);
 
             for (uint i = 0 ; i < count ; i++)
             {
diff --git a/src/Tizen.Multimedia.Vision/MediaVision/ObjectDetector.cs b/src/Tizen.Multimedia.Vision/MediaVision/ObjectDetector.cs
index 4b356a416c8..950658f1ad4 100755
--- a/src/Tizen.Multimedia.Vision/MediaVision/ObjectDetector.cs
+++ b/src/Tizen.Multimedia.Vision/MediaVision/ObjectDetector.cs
@@ -101,7 +101,7 @@ private static IEnumerable<ObjectDetectionResult> GetResults(int number, int[] i
                 return Enumerable.Empty<ObjectDetectionResult>();
             }
 
-            var results = new List<ObjectDetectionResult>();
+            var results = new List<ObjectDetectionResult>(number);
 
             for (int i = 0; i < number; i++)
             {