v2.23.1v2.23.1

- **Issues:**
   - (Add) Suction cups: Additional setting to specify the required minimum height to be flagged as a issue (#302)
   - (Change) Allow touching bounds to have a bounding rectangle and zoom into the issue
   - (Change) Disable the ability to copy issues row text from list as this is crashing the program
   - (Change) Decrease cache count of the layers from x10 to x5 to free RAM
   - (Fix) Touching bounds are reporting areas of 0
   - (Fix) Draw crosshair for issues are called multiple times
   - (Fix) Detection error when resin traps are enabled on some cases (#303)
   - (Fix) Resin trap false-positives (#305)
   - (Fix) When removing multiple islands at once only the first is cleared from the issue list
- **UI:**
   - (Change) Tool - Resize icon
   - (Change) Move "Crosshairs" button inside "Issues" button
- (Add) Tool - Morph - Offset crop: Like erode but discards the outer pixels
- (Fix) Corrected bottom lift unit label in light-off delay calculator (#304)

7 files changed, 63 insertions, 26 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c031c11..3650bc4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,26 @@
 # Changelog
 
+## 23/09/2021 - v2.23.1
+
+- **Issues:**
+   - (Add) Suction cups: Additional setting to specify the required minimum height to be flagged as a issue (#302)
+   - (Change) Allow touching bounds to have a bounding rectangle and zoom into the issue
+   - (Change) Disable the ability to copy issues row text from list as this is crashing the program
+   - (Change) Decrease cache count of the layers from x10 to x5 to free RAM
+   - (Fix) Touching bounds are reporting areas of 0
+   - (Fix) Draw crosshair for issues are called multiple times
+   - (Fix) Detection error when resin traps are enabled on some cases (#303)
+   - (Fix) Resin trap false-positives (#305)
+   - (Fix) When removing multiple islands at once only the first is cleared from the issue list
+- **UI:**
+   - (Change) Tool - Resize icon
+   - (Change) Move "Crosshairs" button inside "Issues" button
+- (Add) Tool - Morph - Offset crop: Like erode but discards the outer pixels
+- (Fix) Corrected bottom lift unit label in light-off delay calculator (#304)
+
 ## 21/09/2021 - v2.23.0
 
-- Issues:
+- **Issues:**
    - **Suction cups:**
       - Add a auto repair feature for this issues by drill a vertical vent hole (#296)
       - Add a manual repair feature for this issues by drill a vertical vent hole when click on remove (#301)
diff --git a/UVtools.Core/EmguCV/EmguContours.cs b/UVtools.Core/EmguCV/EmguContours.cs
index 62bfd47..50e37a4 100644
--- a/UVtools.Core/EmguCV/EmguContours.cs
+++ b/UVtools.Core/EmguCV/EmguContours.cs
@@ -241,7 +241,7 @@ namespace UVtools.Core.EmguCV
 
             CvInvoke.BitwiseAnd(contour1Mat, contour2Mat, contour1Mat);
 
-            return contour1Mat.FindFirstPositivePixel() != -1;
+            return !contour1Mat.IsZeroed();
         }
     }
 }
diff --git a/UVtools.Core/Extensions/EmguExtensions.cs b/UVtools.Core/Extensions/EmguExtensions.cs
index 90473c4..1e85659 100644
--- a/UVtools.Core/Extensions/EmguExtensions.cs
+++ b/UVtools.Core/Extensions/EmguExtensions.cs
@@ -515,15 +515,9 @@ namespace UVtools.Core.Extensions
         /// <param name="mat"></param>
         /// <param name="threshold">Pixel brightness threshold</param>
         /// <returns></returns>
-        public static unsafe bool IsZeroed(this Mat mat, byte threshold = 0)
+        public static bool IsZeroed(this Mat mat, byte threshold = 0)
         {
-            var ptr = mat.GetBytePointer();
-            var length = mat.GetLength();
-            for (var i = 0; i < length; i++)
-            {
-                if (ptr[i] > threshold) return false;
-            }
-            return true;
+            return mat.FindFirstPixelGreaterThan(threshold) == -1;
         }
         #endregion
 
@@ -546,7 +540,7 @@ namespace UVtools.Core.Extensions
         /// <returns>Pixel position in the span, or -1 if not found</returns>
         public static int FindFirstPositivePixel(this Mat mat)
         {
-            return mat.FindFirstPixelEqualOrGreaterThan(1);
+            return mat.FindFirstPixelGreaterThan(0);
         }
 
         /// <summary>
@@ -1117,7 +1111,7 @@ namespace UVtools.Core.Extensions
 
                 // if there are no more 'white' pixels in the image, then
                 // break from the loop
-                if (image.FindFirstPixelEqualOrGreaterThan(1) == -1) break;
+                if (image.IsZeroed()) break;
             }
 
             return skeleton;
diff --git a/UVtools.Core/Managers/IssueManager.cs b/UVtools.Core/Managers/IssueManager.cs
index 6eb6874..a8109ee 100644
--- a/UVtools.Core/Managers/IssueManager.cs
+++ b/UVtools.Core/Managers/IssueManager.cs
@@ -1115,7 +1115,7 @@ namespace UVtools.Core.Managers
                 CvInvoke.Circle(circleCheck, new(centroid.X + inverseOffset.X, centroid.Y + inverseOffset.Y), diameter, EmguExtensions.WhiteColor, -1);
                 CvInvoke.BitwiseAnd(circleCheck, contourMat, circleCheck);
 
-                return circleCheck.FindFirstPositivePixel() != -1
+                return !circleCheck.IsZeroed()
                     ? centroid       /* 5px centroid is inside layer! drill baby drill */
                     : new Point(-1,-1); /* centroid is not inside the actual contour, no drill */
             }
diff --git a/UVtools.Core/Operations/OperationMorph.cs b/UVtools.Core/Operations/OperationMorph.cs
index 27fc4ef..ce73490 100644
--- a/UVtools.Core/Operations/OperationMorph.cs
+++ b/UVtools.Core/Operations/OperationMorph.cs
@@ -31,14 +31,17 @@ namespace UVtools.Core.Operations
             [Description("Dilate: Expands the boundaries within the object")]
             Dilate = MorphOp.Dilate,
 
-            [Description("Gap Closing - Closes small holes inside the objects")]
+            [Description("Gap closing: Closes small holes inside the objects")]
             Close = MorphOp.Close,
 
-            [Description("Noise Removal - Removes small isolated pixels")]
+            [Description("Noise removal: Removes small isolated pixels")]
             Open = MorphOp.Open,
 
-            [Description("Gradient - Removes the interior areas of objects")]
+            [Description("Gradient: Removes the interior areas of objects")]
             Gradient = MorphOp.Gradient,
+
+            [Description("Offset crop: Like erode but discards the outer pixels")]
+            OffsetCrop,
         }
         #endregion
 
@@ -66,6 +69,9 @@ namespace UVtools.Core.Operations
         #endregion
 
         #region Properties
+
+        public MorphOp MorphOperationOpenCV => _morphOperation == MorphOperations.OffsetCrop ? MorphOp.Erode : (MorphOp)_morphOperation;
+
         public MorphOperations MorphOperation
         {
             get => _morphOperation;
@@ -186,13 +192,19 @@ namespace UVtools.Core.Operations
             if (CoreSettings.CanUseCuda)
             {
                 var gpuMat = target.ToGpuMat();
-                using var morph = new CudaMorphologyFilter((MorphOp)MorphOperation, target.Depth, target.NumberOfChannels, Kernel.Matrix, Kernel.Anchor, iterations);
+                using var morph = new CudaMorphologyFilter(MorphOperationOpenCV, target.Depth, target.NumberOfChannels, Kernel.Matrix, Kernel.Anchor, iterations);
                 morph.Apply(gpuMat, gpuMat);
                 gpuMat.Download(target);
             }
             else
             {
-                CvInvoke.MorphologyEx(target, target, (MorphOp) MorphOperation, Kernel.Matrix, Kernel.Anchor, iterations, BorderType.Reflect101, default);
+                CvInvoke.MorphologyEx(target, target, MorphOperationOpenCV, Kernel.Matrix, Kernel.Anchor, iterations, BorderType.Reflect101, default);
+
+                if (_morphOperation == MorphOperations.OffsetCrop)
+                {
+                    var originalRoi = GetRoiOrDefault(original);
+                    originalRoi.CopyTo(target, target);
+                }
             }
 
             ApplyMask(original, target);
diff --git a/UVtools.WPF/MainWindow.axaml b/UVtools.WPF/MainWindow.axaml
index fc3559e..e825817 100644
--- a/UVtools.WPF/MainWindow.axaml
+++ b/UVtools.WPF/MainWindow.axaml
@@ -1868,25 +1868,38 @@
             IsChecked="{Binding ShowLayerImageIssues}"
             ToolTip.Tip="Highlight Issues on current layer. Valid only if Issues are calculated."
             VerticalAlignment="Stretch"
-            Margin="1,0,0,0"
-          >
-            <StackPanel Orientation="Horizontal">
+            Margin="1,0,0,0">
+              <Button.ContextMenu>
+                  <ContextMenu PlacementMode="Bottom">
+                      <CheckBox
+                          ToolTip.Tip="Show crosshairs for selected issues on the current layer"
+                          IsChecked="{Binding ShowLayerImageCrosshairs}">
+                          <StackPanel Orientation="Horizontal">
+                              <Image Source="/Assets/Icons/crosshairs-16x16.png"/>
+                              <TextBlock Margin="5,0,5,0" Text="Crosshairs"/>
+                          </StackPanel>
+                      </CheckBox>
+                        
+                  </ContextMenu>
+              </Button.ContextMenu>
+              <StackPanel Orientation="Horizontal">
               <Image Source="/Assets/Icons/warning-16x16.png"/>
-              <TextBlock Margin="5,0,5,0" Text="Issues"/>
+              <TextBlock Margin="5,0,5,0" Text="Issues ⮟"/>
             </StackPanel>
           </ToggleButton>
 
+            <!--
           <ToggleButton
             IsChecked="{Binding ShowLayerImageCrosshairs}"
-            ToolTip.Tip="Show crosshairs for selected issues on the current layer."
+            ToolTip.Tip="Show crosshairs for selected issues on the current layer"
             VerticalAlignment="Stretch"
-            Margin="1,0,0,0"
-          >
+            Margin="1,0,0,0">
             <StackPanel Orientation="Horizontal">
               <Image Source="/Assets/Icons/crosshairs-16x16.png"/>
               <TextBlock Margin="5,0,5,0" Text="Crosshairs"/>
             </StackPanel>
           </ToggleButton>
+          !-->
 
           <Button Name="LayerPreviewOutlineButton"
             ToolTip.Tip="Click to access the various outlines."
diff --git a/UVtools.WPF/MainWindow.axaml.cs b/UVtools.WPF/MainWindow.axaml.cs
index 7b2e5f1..1271a47 100644
--- a/UVtools.WPF/MainWindow.axaml.cs
+++ b/UVtools.WPF/MainWindow.axaml.cs
@@ -88,7 +88,7 @@ namespace UVtools.WPF
                 Tag = new OperationResize(),
                 Icon = new Avalonia.Controls.Image
                 {
-                    Source = new Bitmap(App.GetAsset("/Assets/Icons/crop-16x16.png"))
+                    Source = new Bitmap(App.GetAsset("/Assets/Icons/expand-alt-16x16.png"))
                 }
             },
             new()