/** @file
  Graphics Output Protocol from the UEFI 2.0 specification.

  Abstraction of a very simple graphics device.

  Copyright (c) 2006 - 2008, Intel Corporation                                                         
  All rights reserved. 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.             

**/

#ifndef __GRAPHICS_OUTPUT_H__
#define __GRAPHICS_OUTPUT_H__

#define EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID \
  { \
    0x9042a9de, 0x23dc, 0x4a38, {0x96, 0xfb, 0x7a, 0xde, 0xd0, 0x80, 0x51, 0x6a } \
  }

typedef struct _EFI_GRAPHICS_OUTPUT_PROTOCOL EFI_GRAPHICS_OUTPUT_PROTOCOL;

typedef struct {
  UINT32            RedMask;
  UINT32            GreenMask;
  UINT32            BlueMask;
  UINT32            ReservedMask;
} EFI_PIXEL_BITMASK;

typedef enum {
  PixelRedGreenBlueReserved8BitPerColor,
  PixelBlueGreenRedReserved8BitPerColor,
  PixelBitMask,
  PixelBltOnly,
  PixelFormatMax
} EFI_GRAPHICS_PIXEL_FORMAT;

typedef struct {
  UINT32                     Version;
  UINT32                     HorizontalResolution;
  UINT32                     VerticalResolution;
  EFI_GRAPHICS_PIXEL_FORMAT  PixelFormat;
  EFI_PIXEL_BITMASK          PixelInformation;
  UINT32                     PixelsPerScanLine;
} EFI_GRAPHICS_OUTPUT_MODE_INFORMATION;

/**
  Return the current video mode information.

  @param  This       Protocol instance pointer.
  @param  ModeNumber The mode number to return information on.
  @param  SizeOfInfo A pointer to the size, in bytes, of the Info buffer.
  @param  Info       A pointer to callee allocated buffer that returns information about ModeNumber.

  @retval EFI_SUCCESS           Mode information returned.
  @retval EFI_BUFFER_TOO_SMALL  The Info buffer was too small.
  @retval EFI_DEVICE_ERROR      A hardware error occurred trying to retrieve the video mode.
  @retval EFI_NOT_STARTED       Video display is not initialized. Call SetMode ()
  @retval EFI_INVALID_PARAMETER One of the input args was NULL.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_GRAPHICS_OUTPUT_PROTOCOL_QUERY_MODE)(
  IN  EFI_GRAPHICS_OUTPUT_PROTOCOL          *This,
  IN  UINT32                                ModeNumber,
  OUT UINTN                                 *SizeOfInfo,
  OUT EFI_GRAPHICS_OUTPUT_MODE_INFORMATION  **Info
  );

/**
  Return the current video mode information.

  @param  This              Protocol instance pointer.
  @param  ModeNumber        The mode number to be set.

  @retval EFI_SUCCESS       Graphics mode was changed.
  @retval EFI_DEVICE_ERROR  The device had an error and could not complete the request.
  @retval EFI_UNSUPPORTED   ModeNumber is not supported by this device.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_GRAPHICS_OUTPUT_PROTOCOL_SET_MODE)(
  IN  EFI_GRAPHICS_OUTPUT_PROTOCOL *This,
  IN  UINT32                       ModeNumber
  );

typedef struct {
  UINT8 Blue;
  UINT8 Green;
  UINT8 Red;
  UINT8 Reserved;
} EFI_GRAPHICS_OUTPUT_BLT_PIXEL;

typedef union {
  EFI_GRAPHICS_OUTPUT_BLT_PIXEL Pixel;
  UINT32                        Raw;
} EFI_GRAPHICS_OUTPUT_BLT_PIXEL_UNION;

///
/// actions for BltOperations
///
typedef enum {
  ///
  /// Write data from the  BltBuffer pixel (SourceX, SourceY) 
  /// directly to every pixel of the video display rectangle 
  /// (DestinationX, DestinationY) (DestinationX + Width, DestinationY + Height). 
  /// Only one pixel will be used from the BltBuffer. Delta is NOT used.  
  ///
  EfiBltVideoFill,
  
  ///
  /// Read data from the video display rectangle 
  /// (SourceX, SourceY) (SourceX + Width, SourceY + Height) and place it in 
  /// the BltBuffer rectangle (DestinationX, DestinationY ) 
  /// (DestinationX + Width, DestinationY + Height). If DestinationX or 
  /// DestinationY is not zero then Delta must be set to the length in bytes 
  /// of a row in the BltBuffer.  
  ///
  EfiBltVideoToBltBuffer,
  
  ///
  /// Write data from the  BltBuffer rectangle 
  /// (SourceX, SourceY) (SourceX + Width, SourceY + Height) directly to the 
  /// video display rectangle (DestinationX, DestinationY) 
  /// (DestinationX + Width, DestinationY + Height). If SourceX or SourceY is 
  /// not zero then Delta must be set to the length in bytes of a row in the 
  /// BltBuffer.
  ///
  EfiBltBufferToVideo, 
  
  ///
  /// Copy from the video display rectangle (SourceX, SourceY)
  /// (SourceX + Width, SourceY + Height) .to the video display rectangle 
  /// (DestinationX, DestinationY) (DestinationX + Width, DestinationY + Height). 
  /// The BltBuffer and Delta  are not used in this mode.
  /// EfiBltVideoToVideo,
  ///
  EfiBltVideoToVideo,
  
  EfiGraphicsOutputBltOperationMax
} EFI_GRAPHICS_OUTPUT_BLT_OPERATION;

/**
  Blt a rectangle of pixels on the graphics screen. Blt stands for BLock Transfer.
  
  @param  This         Protocol instance pointer.
  @param  BltBuffer    Buffer containing data to blit into video buffer. This
                       buffer has a size of Width*Height*sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL)
  @param  BltOperation Operation to perform on BlitBuffer and video memory
  @param  SourceX      X coordinate of source for the BltBuffer.
  @param  SourceY      Y coordinate of source for the BltBuffer.
  @param  DestinationX X coordinate of destination for the BltBuffer.
  @param  DestinationY Y coordinate of destination for the BltBuffer.
  @param  Width        Width of rectangle in BltBuffer in pixels.
  @param  Height       Hight of rectangle in BltBuffer in pixels.
  @param  Delta        OPTIONAL

  @retval EFI_SUCCESS           The Blt operation completed.
  @retval EFI_INVALID_PARAMETER BltOperation is not valid.
  @retval EFI_DEVICE_ERROR      A hardware error occured writting to the video buffer.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_GRAPHICS_OUTPUT_PROTOCOL_BLT)(
  IN  EFI_GRAPHICS_OUTPUT_PROTOCOL            *This,
  IN  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
  );

typedef struct {
  UINT32                                 MaxMode;
  UINT32                                 Mode;
  EFI_GRAPHICS_OUTPUT_MODE_INFORMATION   *Info;
  UINTN                                  SizeOfInfo;
  EFI_PHYSICAL_ADDRESS                   FrameBufferBase;
  UINTN                                  FrameBufferSize;
} EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE;

///
/// Provides a basic abstraction to set video modes and copy pixels to and from 
/// the graphics controller's frame buffer. The linear address of the hardware 
/// frame buffer is also exposed so software can write directly to the video hardware.
///
struct _EFI_GRAPHICS_OUTPUT_PROTOCOL {
  EFI_GRAPHICS_OUTPUT_PROTOCOL_QUERY_MODE  QueryMode;
  EFI_GRAPHICS_OUTPUT_PROTOCOL_SET_MODE    SetMode;
  EFI_GRAPHICS_OUTPUT_PROTOCOL_BLT         Blt;
  ///
  /// Pointer to EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE data.
  ///
  EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE        *Mode;
};

extern EFI_GUID gEfiGraphicsOutputProtocolGuid;

#endif
