Merge pull request #1456 from jacob-m-nash/floodfill-maskonly-set-color

Encoded white grey value into maskonly flag
shimat · Aug 16, 2022 · cf9c448 · cf9c448
2 parents 16342ee + 3dc0687
commit cf9c448
Showing 1 changed file with 14 additions and 2 deletions.
diff --git a/src/OpenCvSharp/Cv2/Cv2_imgproc.cs b/src/OpenCvSharp/Cv2/Cv2_imgproc.cs
@@ -2274,7 +2274,8 @@ public static int FloodFill(InputOutputArray image, Point seedPoint, Scalar newV
         /// being added to the component.</param>
         /// <param name="flags">Operation flags. Lower bits contain a connectivity value, 
         /// 4 (default) or 8, used within the function. Connectivity determines which 
-        /// neighbors of a pixel are considered. </param>
+        /// neighbors of a pixel are considered. Using FloodFillFlags.MaskOnly will
+        /// fill in the mask using the grey value 255 (white). </param>
         /// <returns></returns>
         public static int FloodFill(InputOutputArray image,
                                     Point seedPoint, Scalar newVal, out Rect rect,
@@ -2287,6 +2288,11 @@ public static int FloodFill(InputOutputArray image, Point seedPoint, Scalar newV
             var loDiff0 = loDiff.GetValueOrDefault(new Scalar());
             var upDiff0 = upDiff.GetValueOrDefault(new Scalar());
 
+            if (flags.HasFlag(FloodFillFlags.MaskOnly))
+            {
+	            flags |= (FloodFillFlags)(255 << 8);
+            }
+
             NativeMethods.HandleException(
                 NativeMethods.imgproc_floodFill1(
                     image.CvPtr, seedPoint, newVal, out rect,
@@ -2340,7 +2346,8 @@ public static int FloodFill(InputOutputArray image, Point seedPoint, Scalar newV
         /// being added to the component.</param>
         /// <param name="flags">Operation flags. Lower bits contain a connectivity value, 
         /// 4 (default) or 8, used within the function. Connectivity determines which 
-        /// neighbors of a pixel are considered. </param>
+        /// neighbors of a pixel are considered. Using FloodFillFlags.MaskOnly will
+        /// fill in the mask using the grey value 255 (white). </param>
         /// <returns></returns>
         public static int FloodFill(InputOutputArray image, InputOutputArray mask,
                                     Point seedPoint, Scalar newVal, out Rect rect,
@@ -2356,6 +2363,11 @@ public static int FloodFill(InputOutputArray image, Point seedPoint, Scalar newV
             var loDiff0 = loDiff.GetValueOrDefault(new Scalar());
             var upDiff0 = upDiff.GetValueOrDefault(new Scalar());
 
+            if (flags.HasFlag(FloodFillFlags.MaskOnly))
+            {
+	            flags |= (FloodFillFlags)(255 << 8);
+            }
+
             NativeMethods.HandleException(
                 NativeMethods.imgproc_floodFill2(
                     image.CvPtr, mask.CvPtr, seedPoint,