Fix memory leak in sampler tests

Former-commit-id: 4b9ffafdd826522b192bfeb8411faefee7621a16
Former-commit-id: 560f124d694ee156b4a1e7e6a0c2d92ee87edc0e
Former-commit-id: 672cf548c6014bfbd4ec4453d1b029e11091f533

tests/ImageProcessorCore.Tests/Processors/Samplers/SamplerTests.cs

@@ -61,6 +61,7 @@
                     Stopwatch watch = Stopwatch.StartNew();
                     Image image = new Image(stream);
                     string filename = Path.GetFileNameWithoutExtension(file) + "-" + name + Path.GetExtension(file);
+
                     using (FileStream output = File.OpenWrite($"TestOutput/Sample/{ Path.GetFileName(filename) }"))
                     {
                         processor.OnProgress += this.ProgressUpdate;
@@ -69,6 +70,7 @@
                         processor.OnProgress -= this.ProgressUpdate;
                     }
 
+                    image.Dispose();
                     Trace.WriteLine($"{ name }: { watch.ElapsedMilliseconds}ms");
                 }
             }
@@ -88,8 +90,9 @@
                 using (FileStream stream = File.OpenRead(file))
                 {
                     Stopwatch watch = Stopwatch.StartNew();
-                    Image image = new Image(stream);
                     string filename = Path.GetFileNameWithoutExtension(file) + "-" + name + Path.GetExtension(file);
+
+                    using (Image image = new Image(stream))
                     using (FileStream output = File.OpenWrite($"TestOutput/Resize/{filename}"))
                     {
                         image.Resize(image.Width / 2, image.Height / 2, sampler, false, this.ProgressUpdate)
@@ -116,8 +119,9 @@
                 using (FileStream stream = File.OpenRead(file))
                 {
                     Stopwatch watch = Stopwatch.StartNew();
-                    Image image = new Image(stream);
                     string filename = Path.GetFileNameWithoutExtension(file) + "-" + name + Path.GetExtension(file);
+
+                    using (Image image = new Image(stream))
                     using (FileStream output = File.OpenWrite($"TestOutput/Resize/{filename}"))
                     {
                         image.Resize(image.Width / 3, 0, new TriangleResampler(), false, this.ProgressUpdate)
@@ -144,8 +148,9 @@
                 using (FileStream stream = File.OpenRead(file))
                 {
                     Stopwatch watch = Stopwatch.StartNew();
-                    Image image = new Image(stream);
                     string filename = Path.GetFileNameWithoutExtension(file) + "-" + name + Path.GetExtension(file);
+
+                    using (Image image = new Image(stream))
                     using (FileStream output = File.OpenWrite($"TestOutput/Resize/{filename}"))
                     {
                         image.Resize(0, image.Height / 3, new TriangleResampler(), false, this.ProgressUpdate)
@@ -171,8 +176,9 @@
                 using (FileStream stream = File.OpenRead(file))
                 {
                     Stopwatch watch = Stopwatch.StartNew();
-                    Image image = new Image(stream);
                     string filename = Path.GetFileNameWithoutExtension(file) + "-" + rotateType + flipType + Path.GetExtension(file);
+
+                    using (Image image = new Image(stream))
                     using (FileStream output = File.OpenWrite($"TestOutput/RotateFlip/{filename}"))
                     {
                         image.RotateFlip(rotateType, flipType, this.ProgressUpdate)
@@ -197,8 +203,10 @@
                 using (FileStream stream = File.OpenRead(file))
                 {
                     Stopwatch watch = Stopwatch.StartNew();
-                    Image image = new Image(stream);
+
                     string filename = Path.GetFileName(file);
+
+                    using (Image image = new Image(stream))
                     using (FileStream output = File.OpenWrite($"TestOutput/Rotate/{filename}"))
                     {
                         image.Rotate(45, this.ProgressUpdate)
@@ -223,8 +231,10 @@
                 using (FileStream stream = File.OpenRead(file))
                 {
                     Stopwatch watch = Stopwatch.StartNew();
-                    Image image = new Image(stream);
+
                     string filename = Path.GetFileName(file);
+
+                    using (Image image = new Image(stream))
                     using (FileStream output = File.OpenWrite($"TestOutput/Skew/{filename}"))
                     {
                         image.Skew(45, 45, this.ProgressUpdate)
@@ -248,8 +258,9 @@
             {
                 using (FileStream stream = File.OpenRead(file))
                 {
-                    Image image = new Image(stream);
                     string filename = Path.GetFileNameWithoutExtension(file) + "-EntropyCrop" + Path.GetExtension(file);
+
+                    using (Image image = new Image(stream))
                     using (FileStream output = File.OpenWrite($"TestOutput/EntropyCrop/{filename}"))
                     {
                         image.EntropyCrop(.5f, this.ProgressUpdate).Save(output);