From 7ed4c5c52554f0f5667ce6da9bf216ba4e80b152 Mon Sep 17 00:00:00 2001
From: alggm <31921935+alggm@users.noreply.github.com>
Date: Wed, 13 Sep 2017 12:37:39 +0200
Subject: [PATCH] Fix display of jpeg with luminance subsampling (for instance,
 if MCU is Y=1x1, Cb=2x2, Cr=2x2).

Missing offset inside the MCU for the chroma components. For isntance, for the case where MCU is Y=1x1, Cb=2x2, Cr=2x2, the four 8x8 chrominance blocks ended up being written at the same location, thus most of the picture appeared in grayscale.
---
 ImgDecode.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ImgDecode.cpp b/ImgDecode.cpp
index 88e00b4..d7e61f8 100644
--- a/ImgDecode.cpp
+++ b/ImgDecode.cpp
@@ -3364,7 +3364,7 @@ void CimgDecode::DecodeScanImg(unsigned nStart,bool bDisplay,bool bQuiet)
 
 						// Store fullres value
 						if (bDisplay)
-							SetFullRes(nMcuX,nMcuY,nComp,0,0,m_nDcChrCb);
+							SetFullRes(nMcuX,nMcuY,nComp,nCssIndH,nCssIndV,m_nDcChrCb);
 
 					}
 				}
@@ -3396,7 +3396,7 @@ void CimgDecode::DecodeScanImg(unsigned nStart,bool bDisplay,bool bQuiet)
 
 						// Store fullres value
 						if (bDisplay)
-							SetFullRes(nMcuX,nMcuY,nComp,0,0,m_nDcChrCr);
+							SetFullRes(nMcuX,nMcuY,nComp,nCssIndH,nCssIndV,m_nDcChrCr);
 
 					}
 				}