Omap35xxPkg/LcdGraphicsOutputDxe/LcdGraphicsOutputBlt.c - device/linaro/bootloader/edk2 - Git at Google

 /** @file

  Copyright (c) 2011, ARM Ltd. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

  **/

 #include <PiDxe.h>
 #include <Library/BaseMemoryLib.h>
 #include <Library/DevicePathLib.h>
 #include <Library/UefiBootServicesTableLib.h>
 #include <Library/UefiRuntimeServicesTableLib.h>
 #include <Library/MemoryAllocationLib.h>

 #include <Guid/GlobalVariable.h>

 #include "LcdGraphicsOutputDxe.h"

 extern BOOLEAN mDisplayInitialized;

 //
 // Function Definitions
 //

 STATIC
 EFI_STATUS
 VideoCopyNoHorizontalOverlap (
   IN UINTN          BitsPerPixel,
   IN volatile VOID  *FrameBufferBase,
   IN UINT32         HorizontalResolution,
   IN UINTN          SourceX,
   IN UINTN          SourceY,
   IN UINTN          DestinationX,
   IN UINTN          DestinationY,
   IN UINTN          Width,
   IN UINTN          Height
   )
 {
   EFI_STATUS    Status = EFI_SUCCESS;
   UINTN         SourceLine;
   UINTN         DestinationLine;
   UINTN         WidthInBytes;
   UINTN         LineCount;
   INTN          Step;
   VOID          *SourceAddr;
   VOID          *DestinationAddr;

   if( DestinationY <= SourceY ) {
     // scrolling up (or horizontally but without overlap)
     SourceLine       = SourceY;
     DestinationLine  = DestinationY;
     Step             = 1;
   } else {
     // scrolling down
     SourceLine       = SourceY + Height;
     DestinationLine  = DestinationY + Height;
     Step             = -1;
   }

   WidthInBytes = Width * 2;

   for( LineCount = 0; LineCount < Height; LineCount++ ) {
     // Update the start addresses of source & destination using 16bit pointer arithmetic
     SourceAddr      = (VOID *)((UINT16 *)FrameBufferBase + SourceLine      * HorizontalResolution + SourceX     );
     DestinationAddr = (VOID *)((UINT16 *)FrameBufferBase + DestinationLine * HorizontalResolution + DestinationX);

     // Copy the entire line Y from video ram to the temp buffer
     CopyMem( DestinationAddr, SourceAddr, WidthInBytes);

     // Update the line numbers
     SourceLine      += Step;
     DestinationLine += Step;
   }

   return Status;
 }

 STATIC
 EFI_STATUS
 VideoCopyHorizontalOverlap (
   IN UINTN          BitsPerPixel,
   IN volatile VOID  *FrameBufferBase,
   UINT32            HorizontalResolution,
   IN UINTN          SourceX,
   IN UINTN          SourceY,
   IN UINTN          DestinationX,
   IN UINTN          DestinationY,
   IN UINTN          Width,
   IN UINTN          Height
   )
 {
   EFI_STATUS      Status = EFI_SUCCESS;

   UINT16 *PixelBuffer16bit;
   UINT16 *SourcePixel16bit;
   UINT16 *DestinationPixel16bit;

   UINT32          SourcePixelY;
   UINT32          DestinationPixelY;
   UINTN           SizeIn16Bits;

   // Allocate a temporary buffer
   PixelBuffer16bit = (UINT16 *) AllocatePool((Height * Width) * sizeof(UINT16));

   if (PixelBuffer16bit == NULL) {
     Status = EFI_OUT_OF_RESOURCES;
     goto EXIT;
   }

   // Access each pixel inside the source area of the Video Memory and copy it to the temp buffer

   SizeIn16Bits = Width * 2;

   for (SourcePixelY = SourceY, DestinationPixel16bit = PixelBuffer16bit;
        SourcePixelY < SourceY + Height;
        SourcePixelY++, DestinationPixel16bit += Width)
   {
     // Calculate the source address:
     SourcePixel16bit = (UINT16 *)FrameBufferBase + SourcePixelY * HorizontalResolution + SourceX;

     // Copy the entire line Y from Video to the temp buffer
     CopyMem( (VOID *)DestinationPixel16bit, (CONST VOID *)SourcePixel16bit, SizeIn16Bits);
   }

   // Copy from the temp buffer into the destination area of the Video Memory

   for (DestinationPixelY = DestinationY, SourcePixel16bit = PixelBuffer16bit;
        DestinationPixelY < DestinationY + Height;
        DestinationPixelY++, SourcePixel16bit += Width)
   {
     // Calculate the target address:
     DestinationPixel16bit = (UINT16 *)FrameBufferBase + (DestinationPixelY * HorizontalResolution + DestinationX);

     // Copy the entire line Y from the temp buffer to Video
     CopyMem( (VOID *)DestinationPixel16bit, (CONST VOID *)SourcePixel16bit, SizeIn16Bits);
   }

   // Free the allocated memory
   FreePool((VOID *) PixelBuffer16bit);


 EXIT:
   return Status;
 }

 STATIC
 EFI_STATUS
 BltVideoFill (
   IN EFI_GRAPHICS_OUTPUT_PROTOCOL        *This,
   IN OUT EFI_GRAPHICS_OUTPUT_BLT_PIXEL   *EfiSourcePixel,     OPTIONAL
   IN UINTN                               SourceX,
   IN UINTN                               SourceY,
   IN UINTN                               DestinationX,
   IN UINTN                               DestinationY,
   IN UINTN                               Width,
   IN UINTN                               Height,
   IN UINTN                               Delta           OPTIONAL   // Number of BYTES in a row of the BltBuffer
   )
 {
   EFI_PIXEL_BITMASK*  PixelInformation;
   EFI_STATUS          Status;
   UINT32              HorizontalResolution;
   VOID                *FrameBufferBase;
   UINT16              *DestinationPixel16bit;
   UINT16              Pixel16bit;
   UINT32              DestinationPixelX;
   UINT32              DestinationLine;

   Status           = EFI_SUCCESS;
   PixelInformation = &This->Mode->Info->PixelInformation;
   FrameBufferBase = (UINTN *)((UINTN)(This->Mode->FrameBufferBase));
   HorizontalResolution = This->Mode->Info->HorizontalResolution;

   // Convert the EFI pixel at the start of the BltBuffer(0,0) into a video display pixel
   Pixel16bit = (UINT16) (
       ( (EfiSourcePixel->Red      <<  8) & PixelInformation->RedMask      )
     | ( (EfiSourcePixel->Green    <<  3) & PixelInformation->GreenMask    )
     | ( (EfiSourcePixel->Blue     >>  3) & PixelInformation->BlueMask     )
    );

   // Copy the SourcePixel into every pixel inside the target rectangle
   for (DestinationLine = DestinationY;
        DestinationLine < DestinationY + Height;
        DestinationLine++)
   {
     for (DestinationPixelX = DestinationX;
          DestinationPixelX < DestinationX + Width;
          DestinationPixelX++)
     {
       // Calculate the target address:
       DestinationPixel16bit =  (UINT16 *)FrameBufferBase + DestinationLine * HorizontalResolution  + DestinationPixelX;

       // Copy the pixel into the new target
       *DestinationPixel16bit = Pixel16bit;
     }
   }


   return Status;
 }

 STATIC
 EFI_STATUS
 BltVideoToBltBuffer (
   IN EFI_GRAPHICS_OUTPUT_PROTOCOL        *This,
   IN OUT EFI_GRAPHICS_OUTPUT_BLT_PIXEL   *BltBuffer,     OPTIONAL
   IN UINTN                               SourceX,
   IN UINTN                               SourceY,
   IN UINTN                               DestinationX,
   IN UINTN                               DestinationY,
   IN UINTN                               Width,
   IN UINTN                               Height,
   IN UINTN                               Delta           OPTIONAL   // Number of BYTES in a row of the BltBuffer
   )
 {
   EFI_STATUS         Status;
   UINT32             HorizontalResolution;
   EFI_PIXEL_BITMASK  *PixelInformation;
   EFI_GRAPHICS_OUTPUT_BLT_PIXEL *EfiDestinationPixel;
   VOID               *FrameBufferBase;
   UINT16             *SourcePixel16bit;
   UINT16             Pixel16bit;
   UINT32             SourcePixelX;
   UINT32             SourceLine;
   UINT32             DestinationPixelX;
   UINT32             DestinationLine;
   UINT32             BltBufferHorizontalResolution;

   Status = EFI_SUCCESS;
   PixelInformation = &This->Mode->Info->PixelInformation;
   HorizontalResolution = This->Mode->Info->HorizontalResolution;
   FrameBufferBase = (UINTN *)((UINTN)(This->Mode->FrameBufferBase));

   if(( Delta != 0 ) && ( Delta != Width * sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL))) {
     // Delta is not zero and it is different from the width.
     // Divide it by the size of a pixel to find out the buffer's horizontal resolution.
     BltBufferHorizontalResolution = (UINT32) (Delta / sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL));
   } else {
     BltBufferHorizontalResolution = Width;
   }

   // Access each pixel inside the Video Memory
   for (SourceLine = SourceY, DestinationLine = DestinationY;
        SourceLine < SourceY + Height;
        SourceLine++, DestinationLine++)
   {
     for (SourcePixelX = SourceX, DestinationPixelX = DestinationX;
          SourcePixelX < SourceX + Width;
          SourcePixelX++, DestinationPixelX++)
     {
       // Calculate the source and target addresses:
       SourcePixel16bit = (UINT16 *)FrameBufferBase + SourceLine * HorizontalResolution + SourcePixelX;
       EfiDestinationPixel = BltBuffer + DestinationLine * BltBufferHorizontalResolution + DestinationPixelX;

       // Snapshot the pixel from the video buffer once, to speed up the operation.
       // If we were dereferencing the pointer, as it is volatile, we would perform 3 memory read operations.
       Pixel16bit = *SourcePixel16bit;

       // Copy the pixel into the new target
       EfiDestinationPixel->Red      = (UINT8) ( (Pixel16bit & PixelInformation->RedMask     ) >>  8 );
       EfiDestinationPixel->Green    = (UINT8) ( (Pixel16bit & PixelInformation->GreenMask   ) >>  3 );
       EfiDestinationPixel->Blue     = (UINT8) ( (Pixel16bit & PixelInformation->BlueMask    ) <<  3 );
     }
   }

   return Status;
 }

 STATIC
 EFI_STATUS
 BltBufferToVideo (
   IN EFI_GRAPHICS_OUTPUT_PROTOCOL        *This,
   IN OUT EFI_GRAPHICS_OUTPUT_BLT_PIXEL   *BltBuffer,     OPTIONAL
   IN UINTN                               SourceX,
   IN UINTN                               SourceY,
   IN UINTN                               DestinationX,
   IN UINTN                               DestinationY,
   IN UINTN                               Width,
   IN UINTN                               Height,
   IN UINTN                               Delta           OPTIONAL   // Number of BYTES in a row of the BltBuffer
   )
 {
   EFI_STATUS         Status;
   UINT32             HorizontalResolution;
   EFI_PIXEL_BITMASK  *PixelInformation;
   EFI_GRAPHICS_OUTPUT_BLT_PIXEL *EfiSourcePixel;
   VOID               *FrameBufferBase;
   UINT16             *DestinationPixel16bit;
   UINT32             SourcePixelX;
   UINT32             SourceLine;
   UINT32             DestinationPixelX;
   UINT32             DestinationLine;
   UINT32             BltBufferHorizontalResolution;

   Status = EFI_SUCCESS;
   PixelInformation = &This->Mode->Info->PixelInformation;
   HorizontalResolution = This->Mode->Info->HorizontalResolution;
   FrameBufferBase = (UINTN *)((UINTN)(This->Mode->FrameBufferBase));

   if(( Delta != 0 ) && ( Delta != Width * sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL))) {
     // Delta is not zero and it is different from the width.
     // Divide it by the size of a pixel to find out the buffer's horizontal resolution.
     BltBufferHorizontalResolution = (UINT32) (Delta / sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL));
   } else {
     BltBufferHorizontalResolution = Width;
   }

   // Access each pixel inside the BltBuffer Memory
   for (SourceLine = SourceY, DestinationLine = DestinationY;
        SourceLine < SourceY + Height;
        SourceLine++, DestinationLine++) {

     for (SourcePixelX = SourceX, DestinationPixelX = DestinationX;
          SourcePixelX < SourceX + Width;
          SourcePixelX++, DestinationPixelX++)
     {
       // Calculate the source and target addresses:
       EfiSourcePixel  = BltBuffer + SourceLine * BltBufferHorizontalResolution + SourcePixelX;
       DestinationPixel16bit = (UINT16 *)FrameBufferBase + DestinationLine * HorizontalResolution + DestinationPixelX;

       // Copy the pixel into the new target
       // Only the most significant bits will be copied across:
       // To convert from 8 bits to 5 bits per pixel we throw away the 3 least significant bits
         *DestinationPixel16bit = (UINT16) (
               ( (EfiSourcePixel->Red      <<  8) & PixelInformation->RedMask      )
             | ( (EfiSourcePixel->Green    <<  3) & PixelInformation->GreenMask    )
             | ( (EfiSourcePixel->Blue     >>  3) & PixelInformation->BlueMask     )
             );
       }
     }

   return Status;
 }

 STATIC
 EFI_STATUS
 BltVideoToVideo (
   IN EFI_GRAPHICS_OUTPUT_PROTOCOL        *This,
   IN OUT EFI_GRAPHICS_OUTPUT_BLT_PIXEL   *BltBuffer,     OPTIONAL
   IN UINTN                               SourceX,
   IN UINTN                               SourceY,
   IN UINTN                               DestinationX,
   IN UINTN                               DestinationY,
   IN UINTN                               Width,
   IN UINTN                               Height,
   IN UINTN                               Delta           OPTIONAL   // Number of BYTES in a row of the BltBuffer
   )
 {
   EFI_STATUS         Status;
   UINT32             HorizontalResolution;
   UINTN              BitsPerPixel;
   VOID               *FrameBufferBase;

   BitsPerPixel = 16;

   HorizontalResolution = This->Mode->Info->HorizontalResolution;
   FrameBufferBase = (UINTN *)((UINTN)(This->Mode->FrameBufferBase));

   //
   // BltVideo to BltVideo:
   //
   //  Source is the Video Memory,
   //  Destination is the Video Memory

   FrameBufferBase = (UINTN *)((UINTN)(This->Mode->FrameBufferBase));

   // The UEFI spec currently states:
   // "There is no limitation on the overlapping of the source and destination rectangles"
   // Therefore, we must be careful to avoid overwriting the source data
   if( SourceY == DestinationY ) {
     // Copying within the same height, e.g. horizontal shift
     if( SourceX == DestinationX ) {
       // Nothing to do
       Status = EFI_SUCCESS;
     } else if( ((SourceX>DestinationX)?(SourceX - DestinationX):(DestinationX - SourceX)) < Width ) {
       // There is overlap
       Status = VideoCopyHorizontalOverlap (BitsPerPixel, FrameBufferBase, HorizontalResolution, SourceX, SourceY, DestinationX, DestinationY, Width, Height );
     } else {
       // No overlap
       Status = VideoCopyNoHorizontalOverlap (BitsPerPixel, FrameBufferBase, HorizontalResolution, SourceX, SourceY, DestinationX, DestinationY, Width, Height );
     }
   } else {
     // Copying from different heights
     Status = VideoCopyNoHorizontalOverlap (BitsPerPixel, FrameBufferBase, HorizontalResolution, SourceX, SourceY, DestinationX, DestinationY, Width, Height );
   }

   return Status;
 }

 EFI_STATUS
 EFIAPI
 LcdGraphicsBlt (
   IN EFI_GRAPHICS_OUTPUT_PROTOCOL        *This,
   IN OUT EFI_GRAPHICS_OUTPUT_BLT_PIXEL   *BltBuffer,     OPTIONAL
   IN EFI_GRAPHICS_OUTPUT_BLT_OPERATION   BltOperation,
   IN UINTN                               SourceX,
   IN UINTN                               SourceY,
   IN UINTN                               DestinationX,
   IN UINTN                               DestinationY,
   IN UINTN                               Width,
   IN UINTN                               Height,
   IN UINTN                               Delta           OPTIONAL   // Number of BYTES in a row of the BltBuffer
   )
 {
   EFI_STATUS    Status;
   LCD_INSTANCE  *Instance;

   Instance = LCD_INSTANCE_FROM_GOP_THIS(This);

   if (!mDisplayInitialized) {
     InitializeDisplay (Instance);
   }

   switch (BltOperation) {
   case EfiBltVideoFill:
     Status = BltVideoFill (This, BltBuffer, SourceX, SourceY, DestinationX, DestinationY, Width, Height, Delta);
     break;

   case EfiBltVideoToBltBuffer:
     Status = BltVideoToBltBuffer (This, BltBuffer, SourceX, SourceY, DestinationX, DestinationY, Width, Height, Delta);
     break;

   case EfiBltBufferToVideo:
     Status = BltBufferToVideo (This, BltBuffer, SourceX, SourceY, DestinationX, DestinationY, Width, Height, Delta);
     break;

   case EfiBltVideoToVideo:
     Status = BltVideoToVideo (This, BltBuffer, SourceX, SourceY, DestinationX, DestinationY, Width, Height, Delta);
     break;

   case EfiGraphicsOutputBltOperationMax:
   default:
     DEBUG((DEBUG_ERROR, "LcdGraphicsBlt: Invalid Operation\n"));
     Status = EFI_INVALID_PARAMETER;
     break;
 }

   return Status;
 }
	/** @file

	Copyright (c) 2011, ARM Ltd. All rights reserved.<BR>
	This program and the accompanying materials
	are licensed and made available under the terms and conditions of the BSD License
	which accompanies this distribution. The full text of the license may be found at
	http://opensource.org/licenses/bsd-license.php

	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

	**/

	#include <PiDxe.h>
	#include <Library/BaseMemoryLib.h>
	#include <Library/DevicePathLib.h>
	#include <Library/UefiBootServicesTableLib.h>
	#include <Library/UefiRuntimeServicesTableLib.h>
	#include <Library/MemoryAllocationLib.h>

	#include <Guid/GlobalVariable.h>

	#include "LcdGraphicsOutputDxe.h"

	extern BOOLEAN mDisplayInitialized;

	//
	// Function Definitions
	//

	STATIC
	EFI_STATUS
	VideoCopyNoHorizontalOverlap (
	IN UINTN BitsPerPixel,
	IN volatile VOID *FrameBufferBase,
	IN UINT32 HorizontalResolution,
	IN UINTN SourceX,
	IN UINTN SourceY,
	IN UINTN DestinationX,
	IN UINTN DestinationY,
	IN UINTN Width,
	IN UINTN Height
	)
	{
	EFI_STATUS Status = EFI_SUCCESS;
	UINTN SourceLine;
	UINTN DestinationLine;
	UINTN WidthInBytes;
	UINTN LineCount;
	INTN Step;
	VOID *SourceAddr;
	VOID *DestinationAddr;

	if( DestinationY <= SourceY ) {
	// scrolling up (or horizontally but without overlap)
	SourceLine = SourceY;
	DestinationLine = DestinationY;
	Step = 1;
	} else {
	// scrolling down
	SourceLine = SourceY + Height;
	DestinationLine = DestinationY + Height;
	Step = -1;
	}

	WidthInBytes = Width * 2;

	for( LineCount = 0; LineCount < Height; LineCount++ ) {
	// Update the start addresses of source & destination using 16bit pointer arithmetic
	SourceAddr = (VOID )((UINT16 )FrameBufferBase + SourceLine * HorizontalResolution + SourceX );
	DestinationAddr = (VOID )((UINT16 )FrameBufferBase + DestinationLine * HorizontalResolution + DestinationX);

	// Copy the entire line Y from video ram to the temp buffer
	CopyMem( DestinationAddr, SourceAddr, WidthInBytes);

	// Update the line numbers
	SourceLine += Step;
	DestinationLine += Step;
	}

	return Status;
	}

	STATIC
	EFI_STATUS
	VideoCopyHorizontalOverlap (
	IN UINTN BitsPerPixel,
	IN volatile VOID *FrameBufferBase,
	UINT32 HorizontalResolution,
	IN UINTN SourceX,
	IN UINTN SourceY,
	IN UINTN DestinationX,
	IN UINTN DestinationY,
	IN UINTN Width,
	IN UINTN Height
	)
	{
	EFI_STATUS Status = EFI_SUCCESS;

	UINT16 *PixelBuffer16bit;
	UINT16 *SourcePixel16bit;
	UINT16 *DestinationPixel16bit;

	UINT32 SourcePixelY;
	UINT32 DestinationPixelY;
	UINTN SizeIn16Bits;

	// Allocate a temporary buffer
	PixelBuffer16bit = (UINT16 ) AllocatePool((Height Width) * sizeof(UINT16));

	if (PixelBuffer16bit == NULL) {
	Status = EFI_OUT_OF_RESOURCES;
	goto EXIT;
	}

	// Access each pixel inside the source area of the Video Memory and copy it to the temp buffer

	SizeIn16Bits = Width * 2;

	for (SourcePixelY = SourceY, DestinationPixel16bit = PixelBuffer16bit;
	SourcePixelY < SourceY + Height;
	SourcePixelY++, DestinationPixel16bit += Width)
	{
	// Calculate the source address:
	SourcePixel16bit = (UINT16 )FrameBufferBase + SourcePixelY HorizontalResolution + SourceX;

	// Copy the entire line Y from Video to the temp buffer
	CopyMem( (VOID )DestinationPixel16bit, (CONST VOID )SourcePixel16bit, SizeIn16Bits);
	}

	// Copy from the temp buffer into the destination area of the Video Memory

	for (DestinationPixelY = DestinationY, SourcePixel16bit = PixelBuffer16bit;
	DestinationPixelY < DestinationY + Height;
	DestinationPixelY++, SourcePixel16bit += Width)
	{
	// Calculate the target address:
	DestinationPixel16bit = (UINT16 )FrameBufferBase + (DestinationPixelY HorizontalResolution + DestinationX);

	// Copy the entire line Y from the temp buffer to Video
	CopyMem( (VOID )DestinationPixel16bit, (CONST VOID )SourcePixel16bit, SizeIn16Bits);
	}

	// Free the allocated memory
	FreePool((VOID *) PixelBuffer16bit);


	EXIT:
	return Status;
	}

	STATIC
	EFI_STATUS
	BltVideoFill (
	IN EFI_GRAPHICS_OUTPUT_PROTOCOL *This,
	IN OUT EFI_GRAPHICS_OUTPUT_BLT_PIXEL *EfiSourcePixel, OPTIONAL
	IN UINTN SourceX,
	IN UINTN SourceY,
	IN UINTN DestinationX,
	IN UINTN DestinationY,
	IN UINTN Width,
	IN UINTN Height,
	IN UINTN Delta OPTIONAL // Number of BYTES in a row of the BltBuffer
	)
	{
	EFI_PIXEL_BITMASK* PixelInformation;
	EFI_STATUS Status;
	UINT32 HorizontalResolution;
	VOID *FrameBufferBase;
	UINT16 *DestinationPixel16bit;
	UINT16 Pixel16bit;
	UINT32 DestinationPixelX;
	UINT32 DestinationLine;

	Status = EFI_SUCCESS;
	PixelInformation = &This->Mode->Info->PixelInformation;
	FrameBufferBase = (UINTN *)((UINTN)(This->Mode->FrameBufferBase));
	HorizontalResolution = This->Mode->Info->HorizontalResolution;

	// Convert the EFI pixel at the start of the BltBuffer(0,0) into a video display pixel
	Pixel16bit = (UINT16) (
	( (EfiSourcePixel->Red << 8) & PixelInformation->RedMask )
	\| ( (EfiSourcePixel->Green << 3) & PixelInformation->GreenMask )
	\| ( (EfiSourcePixel->Blue >> 3) & PixelInformation->BlueMask )
	);

	// Copy the SourcePixel into every pixel inside the target rectangle
	for (DestinationLine = DestinationY;
	DestinationLine < DestinationY + Height;
	DestinationLine++)
	{
	for (DestinationPixelX = DestinationX;
	DestinationPixelX < DestinationX + Width;
	DestinationPixelX++)
	{
	// Calculate the target address:
	DestinationPixel16bit = (UINT16 )FrameBufferBase + DestinationLine HorizontalResolution + DestinationPixelX;

	// Copy the pixel into the new target
	*DestinationPixel16bit = Pixel16bit;
	}
	}


	return Status;
	}

	STATIC
	EFI_STATUS
	BltVideoToBltBuffer (
	IN EFI_GRAPHICS_OUTPUT_PROTOCOL *This,
	IN OUT EFI_GRAPHICS_OUTPUT_BLT_PIXEL *BltBuffer, OPTIONAL
	IN UINTN SourceX,
	IN UINTN SourceY,
	IN UINTN DestinationX,
	IN UINTN DestinationY,
	IN UINTN Width,
	IN UINTN Height,
	IN UINTN Delta OPTIONAL // Number of BYTES in a row of the BltBuffer
	)
	{
	EFI_STATUS Status;
	UINT32 HorizontalResolution;
	EFI_PIXEL_BITMASK *PixelInformation;
	EFI_GRAPHICS_OUTPUT_BLT_PIXEL *EfiDestinationPixel;
	VOID *FrameBufferBase;
	UINT16 *SourcePixel16bit;
	UINT16 Pixel16bit;
	UINT32 SourcePixelX;
	UINT32 SourceLine;
	UINT32 DestinationPixelX;
	UINT32 DestinationLine;
	UINT32 BltBufferHorizontalResolution;

	Status = EFI_SUCCESS;
	PixelInformation = &This->Mode->Info->PixelInformation;
	HorizontalResolution = This->Mode->Info->HorizontalResolution;
	FrameBufferBase = (UINTN *)((UINTN)(This->Mode->FrameBufferBase));

	if(( Delta != 0 ) && ( Delta != Width * sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL))) {
	// Delta is not zero and it is different from the width.
	// Divide it by the size of a pixel to find out the buffer's horizontal resolution.
	BltBufferHorizontalResolution = (UINT32) (Delta / sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL));
	} else {
	BltBufferHorizontalResolution = Width;
	}

	// Access each pixel inside the Video Memory
	for (SourceLine = SourceY, DestinationLine = DestinationY;
	SourceLine < SourceY + Height;
	SourceLine++, DestinationLine++)
	{
	for (SourcePixelX = SourceX, DestinationPixelX = DestinationX;
	SourcePixelX < SourceX + Width;
	SourcePixelX++, DestinationPixelX++)
	{
	// Calculate the source and target addresses:
	SourcePixel16bit = (UINT16 )FrameBufferBase + SourceLine HorizontalResolution + SourcePixelX;
	EfiDestinationPixel = BltBuffer + DestinationLine * BltBufferHorizontalResolution + DestinationPixelX;

	// Snapshot the pixel from the video buffer once, to speed up the operation.
	// If we were dereferencing the pointer, as it is volatile, we would perform 3 memory read operations.
	Pixel16bit = *SourcePixel16bit;

	// Copy the pixel into the new target
	EfiDestinationPixel->Red = (UINT8) ( (Pixel16bit & PixelInformation->RedMask ) >> 8 );
	EfiDestinationPixel->Green = (UINT8) ( (Pixel16bit & PixelInformation->GreenMask ) >> 3 );
	EfiDestinationPixel->Blue = (UINT8) ( (Pixel16bit & PixelInformation->BlueMask ) << 3 );
	}
	}

	return Status;
	}

	STATIC
	EFI_STATUS
	BltBufferToVideo (
	IN EFI_GRAPHICS_OUTPUT_PROTOCOL *This,
	IN OUT EFI_GRAPHICS_OUTPUT_BLT_PIXEL *BltBuffer, OPTIONAL
	IN UINTN SourceX,
	IN UINTN SourceY,
	IN UINTN DestinationX,
	IN UINTN DestinationY,
	IN UINTN Width,
	IN UINTN Height,
	IN UINTN Delta OPTIONAL // Number of BYTES in a row of the BltBuffer
	)
	{
	EFI_STATUS Status;
	UINT32 HorizontalResolution;
	EFI_PIXEL_BITMASK *PixelInformation;
	EFI_GRAPHICS_OUTPUT_BLT_PIXEL *EfiSourcePixel;
	VOID *FrameBufferBase;
	UINT16 *DestinationPixel16bit;
	UINT32 SourcePixelX;
	UINT32 SourceLine;
	UINT32 DestinationPixelX;
	UINT32 DestinationLine;
	UINT32 BltBufferHorizontalResolution;

	Status = EFI_SUCCESS;
	PixelInformation = &This->Mode->Info->PixelInformation;
	HorizontalResolution = This->Mode->Info->HorizontalResolution;
	FrameBufferBase = (UINTN *)((UINTN)(This->Mode->FrameBufferBase));

	if(( Delta != 0 ) && ( Delta != Width * sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL))) {
	// Delta is not zero and it is different from the width.
	// Divide it by the size of a pixel to find out the buffer's horizontal resolution.
	BltBufferHorizontalResolution = (UINT32) (Delta / sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL));
	} else {
	BltBufferHorizontalResolution = Width;
	}

	// Access each pixel inside the BltBuffer Memory
	for (SourceLine = SourceY, DestinationLine = DestinationY;
	SourceLine < SourceY + Height;
	SourceLine++, DestinationLine++) {

	for (SourcePixelX = SourceX, DestinationPixelX = DestinationX;
	SourcePixelX < SourceX + Width;
	SourcePixelX++, DestinationPixelX++)
	{
	// Calculate the source and target addresses:
	EfiSourcePixel = BltBuffer + SourceLine * BltBufferHorizontalResolution + SourcePixelX;
	DestinationPixel16bit = (UINT16 )FrameBufferBase + DestinationLine HorizontalResolution + DestinationPixelX;

	// Copy the pixel into the new target
	// Only the most significant bits will be copied across:
	// To convert from 8 bits to 5 bits per pixel we throw away the 3 least significant bits
	*DestinationPixel16bit = (UINT16) (
	( (EfiSourcePixel->Red << 8) & PixelInformation->RedMask )
	\| ( (EfiSourcePixel->Green << 3) & PixelInformation->GreenMask )
	\| ( (EfiSourcePixel->Blue >> 3) & PixelInformation->BlueMask )
	);
	}
	}

	return Status;
	}

	STATIC
	EFI_STATUS
	BltVideoToVideo (
	IN EFI_GRAPHICS_OUTPUT_PROTOCOL *This,
	IN OUT EFI_GRAPHICS_OUTPUT_BLT_PIXEL *BltBuffer, OPTIONAL
	IN UINTN SourceX,
	IN UINTN SourceY,
	IN UINTN DestinationX,
	IN UINTN DestinationY,
	IN UINTN Width,
	IN UINTN Height,
	IN UINTN Delta OPTIONAL // Number of BYTES in a row of the BltBuffer
	)
	{
	EFI_STATUS Status;
	UINT32 HorizontalResolution;
	UINTN BitsPerPixel;
	VOID *FrameBufferBase;

	BitsPerPixel = 16;

	HorizontalResolution = This->Mode->Info->HorizontalResolution;
	FrameBufferBase = (UINTN *)((UINTN)(This->Mode->FrameBufferBase));

	//
	// BltVideo to BltVideo:
	//
	// Source is the Video Memory,
	// Destination is the Video Memory

	FrameBufferBase = (UINTN *)((UINTN)(This->Mode->FrameBufferBase));

	// The UEFI spec currently states:
	// "There is no limitation on the overlapping of the source and destination rectangles"
	// Therefore, we must be careful to avoid overwriting the source data
	if( SourceY == DestinationY ) {
	// Copying within the same height, e.g. horizontal shift
	if( SourceX == DestinationX ) {
	// Nothing to do
	Status = EFI_SUCCESS;
	} else if( ((SourceX>DestinationX)?(SourceX - DestinationX):(DestinationX - SourceX)) < Width ) {
	// There is overlap
	Status = VideoCopyHorizontalOverlap (BitsPerPixel, FrameBufferBase, HorizontalResolution, SourceX, SourceY, DestinationX, DestinationY, Width, Height );
	} else {
	// No overlap
	Status = VideoCopyNoHorizontalOverlap (BitsPerPixel, FrameBufferBase, HorizontalResolution, SourceX, SourceY, DestinationX, DestinationY, Width, Height );
	}
	} else {
	// Copying from different heights
	Status = VideoCopyNoHorizontalOverlap (BitsPerPixel, FrameBufferBase, HorizontalResolution, SourceX, SourceY, DestinationX, DestinationY, Width, Height );
	}

	return Status;
	}

	EFI_STATUS
	EFIAPI
	LcdGraphicsBlt (
	IN EFI_GRAPHICS_OUTPUT_PROTOCOL *This,
	IN OUT EFI_GRAPHICS_OUTPUT_BLT_PIXEL *BltBuffer, OPTIONAL
	IN EFI_GRAPHICS_OUTPUT_BLT_OPERATION BltOperation,
	IN UINTN SourceX,
	IN UINTN SourceY,
	IN UINTN DestinationX,
	IN UINTN DestinationY,
	IN UINTN Width,
	IN UINTN Height,
	IN UINTN Delta OPTIONAL // Number of BYTES in a row of the BltBuffer
	)
	{
	EFI_STATUS Status;
	LCD_INSTANCE *Instance;

	Instance = LCD_INSTANCE_FROM_GOP_THIS(This);

	if (!mDisplayInitialized) {
	InitializeDisplay (Instance);
	}

	switch (BltOperation) {
	case EfiBltVideoFill:
	Status = BltVideoFill (This, BltBuffer, SourceX, SourceY, DestinationX, DestinationY, Width, Height, Delta);
	break;

	case EfiBltVideoToBltBuffer:
	Status = BltVideoToBltBuffer (This, BltBuffer, SourceX, SourceY, DestinationX, DestinationY, Width, Height, Delta);
	break;

	case EfiBltBufferToVideo:
	Status = BltBufferToVideo (This, BltBuffer, SourceX, SourceY, DestinationX, DestinationY, Width, Height, Delta);
	break;

	case EfiBltVideoToVideo:
	Status = BltVideoToVideo (This, BltBuffer, SourceX, SourceY, DestinationX, DestinationY, Width, Height, Delta);
	break;

	case EfiGraphicsOutputBltOperationMax:
	default:
	DEBUG((DEBUG_ERROR, "LcdGraphicsBlt: Invalid Operation\n"));
	Status = EFI_INVALID_PARAMETER;
	break;
	}

	return Status;
	}