[PATCH] MdeModulePkg/FrameBufferBltLib: Correctly consider SourceX

["Marvin Häuser" <Marvin.Haeuser@outlook.com>]

From: Marvin Haeuser <mhaeuser@outlook.de>

Currently, SourceX is not considered in the BufferToVideo operation
when the 8-bit pixel format is used. Correctly add the resulting
offset to prevent image corruption.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Signed-off-by: Marvin Haeuser <mhaeuser@outlook.de>
---
 MdeModulePkg/Library/FrameBufferBltLib/FrameBufferBltLib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/MdeModulePkg/Library/FrameBufferBltLib/FrameBufferBltLib.c b/MdeModulePkg/Library/FrameBufferBltLib/FrameBufferBltLib.c
index 47c5326e9958..a084cc81d32e 100644
--- a/MdeModulePkg/Library/FrameBufferBltLib/FrameBufferBltLib.c
+++ b/MdeModulePkg/Library/FrameBufferBltLib/FrameBufferBltLib.c
@@ -504,7 +504,7 @@ FrameBufferBltLibBufferToVideo (
     Destination = Configure->FrameBuffer + Offset;
 
     if (Configure->PixelFormat == PixelBlueGreenRedReserved8BitPerColor) {
-      Source = (UINT8 *) BltBuffer + (SrcY * Delta);
+      Source = (UINT8 *) BltBuffer + (SrcY * Delta) + (SourceX * sizeof (EFI_GRAPHICS_OUTPUT_BLT_PIXEL));
     } else {
       for (IndexX = 0; IndexX < Width; IndexX++) {
         Blt =
-- 
2.23.0.windows.1