From 198989d5983beccc58da4ae4924149130898dcac Mon Sep 17 00:00:00 2001
From: heckflosse <heckflosse67@gmx.de>
Date: Fri, 7 Sep 2018 13:50:42 +0200
Subject: [PATCH] raw ca correction/avoid colour shift: fix colour cast when
 (height % 2) == 1, #4777

---
 rtengine/CA_correct_RT.cc | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/rtengine/CA_correct_RT.cc b/rtengine/CA_correct_RT.cc
index 7abd9bfcc..3d5f806de 100644
--- a/rtengine/CA_correct_RT.cc
+++ b/rtengine/CA_correct_RT.cc
@@ -1274,6 +1274,20 @@ float* RawImageSource::CA_correct_RT(
                 }
             }
 
+            #pragma omp single
+            {
+                if (H % 2) {
+                    int firstCol = FC(H - 1, 0) & 1;
+                    int colour = FC(H - 1, firstCol);
+                    nonGreen = colour == 0 ? &redFactor : &blueFactor;
+                    for (int j = 0; j < (W + 1) / 2; ++j) {
+                        (*nonGreen)[(H + 1) / 2 - 1][j] = (*nonGreen)[(H + 1) / 2 - 2][j];
+                    }
+                }
+            }
+
+            #pragma omp barrier
+
             gaussianBlur(redFactor, redFactor, (W+1)/2, (H+1)/2, 30.0);
             gaussianBlur(blueFactor, blueFactor, (W+1)/2, (H+1)/2, 30.0);