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

  Abstraction of a very simple graphics device.

  Copyright (c) 2006 - 2012, Intel Corporation. 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.             

**/

#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 {
  ///
  /// A pixel is 32-bits and byte zero represents red, byte one represents green, 
  /// byte two represents blue, and byte three is reserved. This is the definition 
  /// for the physical frame buffer. The byte values for the red, green, and blue 
  /// components represent the color intensity. This color intensity value range 
  /// from a minimum intensity of 0 to maximum intensity of 255.
  ///
  PixelRedGreenBlueReserved8BitPerColor,
  ///
  /// A pixel is 32-bits and byte zero represents blue, byte one represents green, 
  /// byte two represents red, and byte three is reserved. This is the definition 
  /// for the physical frame buffer. The byte values for the red, green, and blue 
  /// components represent the color intensity. This color intensity value range 
  /// from a minimum intensity of 0 to maximum intensity of 255.
  ///
  PixelBlueGreenRedReserved8BitPerColor,
  ///
  /// The Pixel definition of the physical frame buffer.
  ///
  PixelBitMask,
  ///
  /// This mode does not support a physical frame buffer.
  ///
  PixelBltOnly,
  ///
  /// Valid EFI_GRAPHICS_PIXEL_FORMAT enum values are less than this value.
  ///
  PixelFormatMax
} EFI_GRAPHICS_PIXEL_FORMAT;

typedef struct {
  ///
  /// The version of this data structure. A value of zero represents the 
  /// EFI_GRAPHICS_OUTPUT_MODE_INFORMATION structure as defined in this specification.
  ///
  UINT32                     Version;
  ///
  /// The size of video screen in pixels in the X dimension.
  ///
  UINT32                     HorizontalResolution;
  ///
  /// The size of video screen in pixels in the Y dimension.
  ///
  UINT32                     VerticalResolution;
  ///
  /// Enumeration that defines the physical format of the pixel. A value of PixelBltOnly 
  /// implies that a linear frame buffer is not available for this mode.
  ///
  EFI_GRAPHICS_PIXEL_FORMAT  PixelFormat;
  ///
  /// This bit-mask is only valid if PixelFormat is set to PixelPixelBitMask. 
  /// A bit being set defines what bits are used for what purpose such as Red, Green, Blue, or Reserved.
  ///
  EFI_PIXEL_BITMASK          PixelInformation;
  ///
  /// Defines the number of pixel elements per video memory line.
  /// 
  UINT32                     PixelsPerScanLine;
} EFI_GRAPHICS_OUTPUT_MODE_INFORMATION;

/**
  Returns information for an available graphics mode that the graphics device
  and the set of active video output devices supports.

  @param  This                  The EFI_GRAPHICS_OUTPUT_PROTOCOL instance.
  @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           Valid mode information was returned.
  @retval EFI_DEVICE_ERROR      A hardware error occurred trying to retrieve the video mode.
  @retval EFI_INVALID_PARAMETER ModeNumber is not valid.

**/
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
  );

/**
  Set the video device into the specified mode and clears the visible portions of 
  the output display to black.

  @param  This              The EFI_GRAPHICS_OUTPUT_PROTOCOL instance.
  @param  ModeNumber        Abstraction that defines the current video mode.

  @retval EFI_SUCCESS       The graphics mode specified by ModeNumber was selected.
  @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 (0, 0) 
  /// 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,
  
  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    The data to transfer to the graphics screen.
                       Size is at least Width*Height*sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL).
  @param  BltOperation The operation to perform when copying BltBuffer on to the graphics screen.
  @param  SourceX      The X coordinate of source for the BltOperation.
  @param  SourceY      The Y coordinate of source for the BltOperation.
  @param  DestinationX The X coordinate of destination for the BltOperation.
  @param  DestinationY The Y coordinate of destination for the BltOperation.
  @param  Width        The width of a rectangle in the blt rectangle in pixels.
  @param  Height       The height of a rectangle in the blt rectangle in pixels.
  @param  Delta        Not used for EfiBltVideoFill or the EfiBltVideoToVideo operation.
                       If a Delta of zero is used, the entire BltBuffer is being operated on.
                       If a subrectangle of the BltBuffer is being used then Delta
                       represents the number of bytes in a row of the BltBuffer.

  @retval EFI_SUCCESS           BltBuffer was drawn to the graphics screen.
  @retval EFI_INVALID_PARAMETER BltOperation is not valid.
  @retval EFI_DEVICE_ERROR      The device had an error and could not complete the request.

**/
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 {
  ///
  /// The number of modes supported by QueryMode() and SetMode().
  ///
  UINT32                                 MaxMode;
  ///
  /// Current Mode of the graphics device. Valid mode numbers are 0 to MaxMode -1.
  ///
  UINT32                                 Mode;
  ///
  /// Pointer to read-only EFI_GRAPHICS_OUTPUT_MODE_INFORMATION data.
  ///
  EFI_GRAPHICS_OUTPUT_MODE_INFORMATION   *Info;
  ///
  /// Size of Info structure in bytes.
  ///
  UINTN                                  SizeOfInfo;
  ///
  /// Base address of graphics linear frame buffer.
  /// Offset zero in FrameBufferBase represents the upper left pixel of the display.
  ///
  EFI_PHYSICAL_ADDRESS                   FrameBufferBase;
  ///
  /// Amount of frame buffer needed to support the active mode as defined by 
  /// PixelsPerScanLine xVerticalResolution x PixelElementSize.
  ///
  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
