MdeModulePkg/HiiDatabase: Preinit background when render string to screen

When render string to screen, for proportional fonts,
the background color may not set to the whole BltBuffer.
And this will cause incorrect display.
Now initialize the background color to fix this issue.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/MdeModulePkg/Universal/HiiDatabaseDxe/Font.c b/MdeModulePkg/Universal/HiiDatabaseDxe/Font.c
index 56b30ff6ff..5d31f7513f 100644
--- a/MdeModulePkg/Universal/HiiDatabaseDxe/Font.c
+++ b/MdeModulePkg/Universal/HiiDatabaseDxe/Font.c
@@ -1613,6 +1613,7 @@ HiiStringToImage (
   UINTN                               StrLength;

   EFI_GRAPHICS_OUTPUT_BLT_PIXEL       *RowBufferPtr;

   HII_GLOBAL_FONT_INFO                *GlobalFont;

+  UINT32                              PreInitBkgnd;

 

   //

   // Check incoming parameters.

@@ -2049,6 +2050,11 @@ HiiStringToImage (
           goto Exit;

         }

         //

+        // Initialize the background color.

+        //

+        PreInitBkgnd = Background.Blue | Background.Green << 8 | Background.Red << 16;

+        SetMem32 (BltBuffer,RowInfo[RowIndex].LineWidth * RowInfo[RowIndex].LineHeight * sizeof (EFI_GRAPHICS_OUTPUT_BLT_PIXEL),PreInitBkgnd);

+        //

         // Set BufferPtr to Origin by adding baseline to the starting position.

         //

         BufferPtr = BltBuffer + BaseLine * RowInfo[RowIndex].LineWidth;