Method FromPNG

rEFIt_UEFI/libeg/XImage.cpp:355–373

* The function converted plain array into XImage object * Error = 0 - Success * Error = 28 - invalid signature */

 * Error = 28 - invalid signature
 */
EFI_STATUS XImage::FromPNG(const UINT8 * Data, UINTN Length)
{
//  DBG("XImage len=%llu\n", Length);
  if (Data == NULL) return EFI_INVALID_PARAMETER;
  UINT8 * PixelPtr; // = (UINT8 *)&PixelData[0];
  unsigned Error = eglodepng_decode(&PixelPtr, &Width, &Height, Data, Length);
  if (Error != 0 && Error != 28) {
    return EFI_NOT_FOUND;
  }
  if ( !PixelPtr ) return EFI_UNSUPPORTED; // It's possible to get error 28 and PixelPtr == NULL
  setSizeInPixels(Width, Height);
  //now we have a new pointer and want to move data
  INTN NewLength = Width * Height * sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL);
  CopyMem(GetPixelPtr(0,0), PixelPtr, NewLength);
  FreePool(PixelPtr); //allocated by lodepng

  FlipRB();
  return EFI_SUCCESS;
}

/*
 * The function creates new array Data and inform about it size to be saved