public void GetPreview()
{
var ddsReadSuccess = false;
try
{
Preview = null;
BCnEncoder.Shared.ImageFiles.DdsFile bcDds;
using (var ms = new MemoryStream())
{
var dds = Texture.ToDdsFile(false);
dds.Write(ms, -1);
ddsReadSuccess = true;
ms.Seek(0, SeekOrigin.Begin);
bcDds = BCnEncoder.Shared.ImageFiles.DdsFile.Load(ms);
}
var width = (int)bcDds.header.dwWidth;
var height = (int)bcDds.header.dwHeight;
var decoder = new BcDecoder();
if (decoder.IsHdrFormat(bcDds))
{
var pixels = new byte[width * height * 3];
var pixelsSpan = MemoryMarshal.Cast <byte, Bgr24>(pixels);
decoder.DecodeDdsToPixels(bcDds, pixelsSpan);
var bmSource = BitmapSource.Create(width, height, 96.0, 96.0, PixelFormats.Bgr24, null, pixels, width * 3);
Preview = bmSource;
}
else
{
var pixels = new byte[width * height * 4];
var pixelsSpan = MemoryMarshal.Cast <byte, Bgra32>(pixels);
decoder.DecodeDdsToPixels(bcDds, pixelsSpan);
var bmSource = BitmapSource.Create(width, height, 96.0, 96.0, PixelFormats.Bgra32, null, pixels, width * 4);
Preview = bmSource;
}
PreviewErrorVisibility = Visibility.Collapsed;
OnPropertyChanged(nameof(Width));
OnPropertyChanged(nameof(Height));
OnPropertyChanged(nameof(TextureInfo));
}
catch (Exception ex)
{
Preview = null;
if (ddsReadSuccess)
{
PreviewError = "Could not create preview! Export/Import may still work." + Environment.NewLine + Environment.NewLine + ex.Message;
}
else
{
PreviewError = "Could not create preview! Failed to convert pssg texture to dds." + Environment.NewLine + Environment.NewLine + ex.Message;
}
PreviewErrorVisibility = Visibility.Visible;
}
}
public static void DecodeDdsToPixels <TPixel>(this BcDecoder decoder, DdsFile dds, Span <TPixel> pixels)
where TPixel : unmanaged, IPixel <TPixel>
{
var width = (int)dds.header.dwWidth;
var height = (int)dds.header.dwHeight;
if (decoder.IsHdrFormat(dds))
{
var source = decoder.DecodeHdr(dds).AsSpan();
for (var r = 0; r < height; ++r)
{
var start = r * width;
var destRow = pixels.Slice(start, width);
var sorcRow = source.Slice(start, width);
for (var c = 0; c < destRow.Length; ++c)
{
ref var destPixel = ref destRow[c];
ref var sorcPixel = ref sorcRow[c];
var rgbVal = sorcPixel.ToVector3();
destPixel.FromScaledVector4(new Vector4(rgbVal, 1));
}
}