#include "XImage.h"


XImage::XImage()
{
  Width = 0;
  Height = 0;
}

XImage::XImage(UINTN W, UINTN H)
{
  Width = W;
  Height = H;
  PixelData.CheckSize(GetWidth()*GetHeight());
}
#if 0
UINT8 Smooth(UINT8* P, int a01, int a10, int a11, int a21, int a12,  int dx, int dy, float scale)
{
  return (UINT8)((*(p + a01) * (scale - dx) * 3 + *(p + a10) * (scale - dy) * 3 + *(p + a21) * dx * 3 +
    *(p + a12) * dy * 3 + *(p + a11) * 2 *scale) / (scale * 8));
}
#endif

XImage::XImage(const XImage& Image, float scale)
{
  Width = (UINTN)(Image.GetWidth() * scale);
  Height = (UINTN)(Image.GetHeight() * scale);
  PixelData.CheckSize(GetWidth()*GetHeight());
#if 0
  UINTN Offset = OFFSET_OF(EFI_GRAPHICS_OUTPUT_BLT_PIXEL, Blue);

  dst.Blue = Smooth(&src.Blue, a01, a10, a11, a21, a12, dx, dy, scale);

#define SMOOTH(P) \
do { \
    ((PIXEL*)dst_ptr)->P = (BYTE)((a01.P * (cx - dx) * 3 + a10.P * (cy - dy) * 3 + \
                            a21.P * dx * 3 + a12.P * dy * 3 + a11.P * (cx + cy)) / ((cx + cy) * 4)); \
} while(0)

  UINT x, y, z;
  PIXEL a10, a11, a12, a01, a21;
  int  fx, cx, lx, dx, fy, cy, ly, dy;
  
  fx = (dst_size->width << PRECISION) / src_size->width;
  fy = (dst_size->height << PRECISION) / src_size->height;
  if (!fx || !fy) {
   return;
   
  }
  
  cx = ((fx - 1) >> PRECISION) + 1;
  cy = ((fy - 1) >> PRECISION) + 1;
  
  for (z = 0; z < dst_size->depth; z++)
  {
    BYTE * dst_slice_ptr = dst + z * dst_slice_pitch;
    const BYTE *src_slice_ptr = src + src_slice_pitch * (z * src_size->depth / dst_size->depth);
    
      for (y = 0; y < dst_size->height; y++)
       {
      BYTE * dst_ptr = dst_slice_ptr + y * dst_row_pitch;
      const BYTE *src_row_ptr = src_slice_ptr + src_row_pitch * (y * src_size->height / dst_size->height);
      ly = (y << PRECISION) / fy;
      dy = y - ((ly * fy) >> PRECISION);
      
      for (x = 0; x < dst_size->width; x++)
      {
        const BYTE *src_ptr = src_row_ptr + (x * src_size->width / dst_size->width) * src_format->bytes_per_pixel;
        
        lx = (x << PRECISION) / fx;
        dx = x - ((lx * fx) >> PRECISION);
        
        a11 = *(PIXEL*)src_ptr;
        a10 = (y == 0) ? a11 : (*(PIXEL*)(src_ptr - src_row_pitch));
        a01 = (x == 0) ? a11 : (*(PIXEL*)(src_ptr - src_format->bytes_per_pixel));
        a21 = (x == dst_size->width) ? a11 : (*(PIXEL*)(src_ptr + src_format->bytes_per_pixel));
        a12 = (y == dst_size->height) ? a11 : (*(PIXEL*)(src_ptr + src_row_pitch));
        
        SMOOTH(r);
        SMOOTH(g);
        SMOOTH(b);
        SMOOTH(a);
        
        dst_ptr += dst_format->bytes_per_pixel;
        }
      }
    }
#endif
}

XImage::~XImage()
{
}

const XArray<EFI_GRAPHICS_OUTPUT_BLT_PIXEL>& XImage::GetData() const
{
  return PixelData;
}

EFI_GRAPHICS_OUTPUT_BLT_PIXEL* XImage::GetPixelPtr(UINTN x, UINTN y)
{
	return &PixelData[x + y * Width];
}

const EFI_GRAPHICS_OUTPUT_BLT_PIXEL& XImage::GetPixel(UINTN x, UINTN y) const
{
	return PixelData[x + y * Width];
}


UINTN      XImage::GetWidth() const
{
  return Width;
}

UINTN      XImage::GetHeight() const
{
  return Height;
}

UINTN XImage::GetSize() const
{
  return Width * Height * sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL);
}

void XImage::Fill(const EFI_GRAPHICS_OUTPUT_BLT_PIXEL& Color)
{
  for (UINTN y = 0; y < Height; ++y)
    for (UINTN x = 0; x < Width; ++x)
      PixelData[y * Width + x] = Color;
}

void XImage::FillArea(const EFI_GRAPHICS_OUTPUT_BLT_PIXEL& Color, const EgRect& Rect)
{
  for (UINTN y = Rect.Ypos; y < Height && (y - Rect.Ypos) < Rect.Height; ++y) {
//    EFI_GRAPHICS_OUTPUT_BLT_PIXEL* Ptr = PixelData + y * Width + Rect.Xpos;
    for (UINTN x = Rect.Xpos; x < Width && (x - Rect.Xpos) < Rect.Width; ++x)
//      *Ptr++ = Color;
      PixelData[y * Width + x] = Color;
  }
}

void XImage::Compose(int PosX, int PosY, const XImage& TopImage, bool Lowest) //lowest image is opaque
{
  UINT32      TopAlpha;
  UINT32      RevAlpha;
  UINT32      FinalAlpha;
  UINT32      Temp;

  for (UINTN y = PosY; y < Height && (y - PosY) < TopImage.GetHeight(); ++y) {
    EFI_GRAPHICS_OUTPUT_BLT_PIXEL& CompPtr = *GetPixelPtr(PosX, y); // I assign a ref to avoid the operator ->. Compiler will produce the same anyway.
    for (UINTN x = PosX; x < Width && (x - PosX) < TopImage.GetWidth(); ++x) {
      TopAlpha = TopImage.GetPixel(x-PosX, y-PosY).Reserved;
      RevAlpha = 255 - TopAlpha;
      FinalAlpha = (255*255 - RevAlpha*(255 - CompPtr.Reserved)) / 255;

//final alpha =(1-(1-x)*(1-y)) =(255*255-(255-topA)*(255-compA))/255
      Temp = (CompPtr.Blue * RevAlpha) + (TopImage.GetPixel(x-PosX, y-PosY).Blue * TopAlpha);
      CompPtr.Blue = (UINT8)(Temp / 255);

      Temp = (CompPtr.Green * RevAlpha) + (TopImage.GetPixel(x-PosX, y-PosY).Green * TopAlpha);
      CompPtr.Green = (UINT8)(Temp / 255);

      Temp = (CompPtr.Red * RevAlpha) + (TopImage.GetPixel(x-PosX, y-PosY).Red * TopAlpha);
      CompPtr.Red = (UINT8)(Temp / 255);

      if (Lowest) {
        CompPtr.Reserved = 255;
      } else {
        CompPtr.Reserved = (UINT8)FinalAlpha;
      }

    }
  }
}

void XImage::FlipRB(bool WantAlpha)
{
  UINTN ImageSize = (Width * Height);
  EFI_GRAPHICS_OUTPUT_BLT_PIXEL* Pixel = GetPixelPtr(0,0);
  for (UINTN i = 0; i < ImageSize; ++i) {
    UINT8 Temp = Pixel->Blue;
    Pixel->Blue = Pixel->Red;
    Pixel->Red = Temp;
    if (!WantAlpha) Pixel->Reserved = 0xFF;
    Pixel++;
  }
}

/*
 * The function converted plain array into XImage object
 */
unsigned XImage::FromPNG(const uint8_t * Data, UINTN Length)
{
  uint8_t * PixelPtr = (uint8_t *)&PixelData[0];
  unsigned Error = eglodepng_decode(&PixelPtr, &Width, &Height, Data, Length);

  FlipRB(true);
  return Error;
}

/*
 * The function creates new array Data and inform about it size to be saved
 * as a file.
 * The caller is responsible to free the array.
 */

unsigned XImage::ToPNG(uint8_t** Data, UINTN& OutSize)
{
  size_t           FileDataLength = 0;
  FlipRB(false);
  uint8_t * PixelPtr = (uint8_t *)&PixelData[0];
  unsigned Error = eglodepng_encode(Data, &FileDataLength, PixelPtr, Width, Height);
  OutSize = FileDataLength;
  return Error;
}

// Screen operations
/*
 * The function to get image from screen. Used in  screenshot (full screen), Pointer (small area) and Draw (small area)
 * XImage must be created with UGAWidth, UGAHeight as egGetScreenSize(&UGAWidth, &UGAHeight); with PixelData allocated
 *       egScreenWidth = GraphicsOutput->Mode->Info->HorizontalResolution;
 *       egScreenHeight = GraphicsOutput->Mode->Info->VerticalResolution;
 *
 * be careful about alpha. This procedure can produce alpha = 0 which means full transparent
 */
void XImage::GetArea(const EgRect& Rect)
{
  GetArea(Rect.Xpos, Rect.Ypos, Rect.Width, Rect.Height);
}

void XImage::GetArea(UINTN x, UINTN y, UINTN W, UINTN H)
{
  EFI_STATUS Status;
  EFI_GUID UgaDrawProtocolGuid = EFI_UGA_DRAW_PROTOCOL_GUID;
  EFI_UGA_DRAW_PROTOCOL *UgaDraw = NULL;
  EFI_GUID GraphicsOutputProtocolGuid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
  EFI_GRAPHICS_OUTPUT_PROTOCOL *GraphicsOutput = NULL;

  Status = EfiLibLocateProtocol(&GraphicsOutputProtocolGuid, (VOID **)&GraphicsOutput);
  if (EFI_ERROR(Status)) {
    GraphicsOutput = NULL;
    Status = EfiLibLocateProtocol(&UgaDrawProtocolGuid, (VOID **)&UgaDraw);
    if (EFI_ERROR(Status))
      UgaDraw = NULL;
  }

  INTN AreaWidth = (x + W > Width) ? (Width - x) : W;
  INTN AreaHeight = (y + H > Height) ? (Height - y) : H;
  
  if (GraphicsOutput != NULL) {
    INTN LineBytes = GraphicsOutput->Mode->Info->HorizontalResolution * sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL);
    GraphicsOutput->Blt(GraphicsOutput,
      (EFI_GRAPHICS_OUTPUT_BLT_PIXEL *)&PixelData[0],
      EfiBltVideoToBltBuffer,
      x, y, 0, 0, AreaWidth, AreaHeight, LineBytes);
  }
  else if (UgaDraw != NULL) {
    UINT32 LineWidth = 0;
    UINT32 ScreenHeight = 0;
    UINT32 Depth = 0;
    UINT32 RefreshRate = 60;
    Status = UgaDraw->GetMode(UgaDraw, &LineWidth, &ScreenHeight, &Depth, &RefreshRate);
    if (EFI_ERROR(Status)) {
      return;   // graphics not available
    }
    UgaDraw->Blt(UgaDraw,
      (EFI_UGA_PIXEL *)&PixelData[0],
      EfiUgaVideoToBltBuffer,
      x, y, 0, 0, AreaWidth, AreaHeight, LineWidth * sizeof(EFI_UGA_PIXEL));
  }

  Width = AreaWidth;
  Height = AreaHeight;
}

void XImage::Draw(int x, int y, float scale)
{
  //prepare images
  INTN ScreenWidth = 0;
  INTN ScreenHeight = 0;
  egGetScreenSize(&ScreenWidth, &ScreenHeight);
  XImage Background(ScreenWidth, ScreenHeight);
  Background.GetArea(x, y, Width, Height);
  XImage Top(*this, scale);
  Background.Compose(x, y, Top, true);
  UINTN AreaWidth = (x + Width > Background.GetWidth()) ? (Background.GetWidth() - x) : Width;
  UINTN AreaHeight = (y + Height > Background.GetHeight()) ? (Background.GetHeight() - y) : Height;

  // prepare protocols
  EFI_STATUS Status;
  EFI_GUID UgaDrawProtocolGuid = EFI_UGA_DRAW_PROTOCOL_GUID;
  EFI_UGA_DRAW_PROTOCOL *UgaDraw = NULL;
  EFI_GUID GraphicsOutputProtocolGuid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
  EFI_GRAPHICS_OUTPUT_PROTOCOL *GraphicsOutput = NULL;

  Status = EfiLibLocateProtocol(&GraphicsOutputProtocolGuid, (VOID **)&GraphicsOutput);
  if (EFI_ERROR(Status)) {
    GraphicsOutput = NULL;
    Status = EfiLibLocateProtocol(&UgaDrawProtocolGuid, (VOID **)&UgaDraw);
    if (EFI_ERROR(Status))
      UgaDraw = NULL;
  }
  //output combined image
  if (GraphicsOutput != NULL) {
    GraphicsOutput->Blt(GraphicsOutput, (EFI_GRAPHICS_OUTPUT_BLT_PIXEL *)Background.GetPixelPtr(0, 0),
      EfiBltBufferToVideo,
      0, 0, x, y,
      AreaWidth, AreaHeight, Background.GetWidth() * 4);
  }
  else if (UgaDraw != NULL) {
    UgaDraw->Blt(UgaDraw, (EFI_UGA_PIXEL *)Background.GetPixelPtr(0, 0), EfiUgaBltBufferToVideo,
      0, 0, x, y,
      AreaWidth, AreaHeight, Background.GetWidth() * 4);
  }
}