public static byte[] ConvertNonMultipleBlockSizeBitmap(byte[] data, uint width, uint height, BitmapFormat format)
{
// assume block size 4 because that's all we deal with in tag data
if (!IsCompressedFormat(format))
{
return(data);
}
uint alignedWidth = width % 4 != 0 ? width + 4 - width % 4 : width;
uint alignedHeight = height % 4 != 0 ? height + 4 - height % 4 : height;
byte[] uncompressedData = BitmapDecoder.DecodeBitmap(data, format, (int)alignedWidth, (int)alignedHeight);
return(TrimAlignedBitmap(format, BitmapFormat.A8R8G8B8, (int)width, (int)height, uncompressedData));
}
public static byte[] ConvertXboxFormats(byte[] data, uint width, uint height, BitmapFormat format, bool requireDecompression)
{
BitmapFormat destinationFormat = GetEquivalentBitmapFormat(format);
if (format == BitmapFormat.Dxn)
{
// flip x and y channels
data = BitmapDecoder.SwapXYDxn(data, (int)width, (int)height);
}
if (destinationFormat == format && !requireDecompression)
{
return(data);
}
if (format == BitmapFormat.Ctx1)
{
data = BitmapDecoder.Ctx1ToDxn(data, (int)width, (int)height);
format = BitmapFormat.Dxn;
}
else if (format != destinationFormat)
{
byte[] uncompressedData = BitmapDecoder.DecodeBitmap(data, format, (int)width, (int)height);
uncompressedData = TrimAlignedBitmap(format, destinationFormat, (int)width, (int)height, uncompressedData);
data = BitmapDecoder.EncodeBitmap(uncompressedData, destinationFormat, (int)width, (int)height);
format = destinationFormat;
}
if (requireDecompression)
{
data = ConvertNonMultipleBlockSizeBitmap(data, width, height, format);
}
return(data);
}
private static bool ConvertImage(BaseBitmap bitmap)
{
BitmapFormat targetFormat = bitmap.Format;
var data = bitmap.Data;
bool DXTFlip = false;
switch (bitmap.Format)
{
case BitmapFormat.Dxt5aMono:
case BitmapFormat.Dxt3aMono:
targetFormat = BitmapFormat.Y8;
bitmap.Flags &= ~BitmapFlags.Compressed;
break;
case BitmapFormat.Dxt3aAlpha:
case BitmapFormat.Dxt5aAlpha:
targetFormat = BitmapFormat.A8;
bitmap.Flags &= ~BitmapFlags.Compressed;
break;
case BitmapFormat.DxnMonoAlpha:
case BitmapFormat.Dxt5a:
case BitmapFormat.AY8:
targetFormat = BitmapFormat.A8Y8;;
bitmap.Flags &= ~BitmapFlags.Compressed;
break;
case BitmapFormat.A4R4G4B4:
case BitmapFormat.R5G6B5:
targetFormat = BitmapFormat.A8R8G8B8;
break;
case BitmapFormat.A8Y8:
case BitmapFormat.Y8:
case BitmapFormat.A8:
case BitmapFormat.A8R8G8B8:
case BitmapFormat.X8R8G8B8:
case BitmapFormat.A16B16G16R16F:
case BitmapFormat.A32B32G32R32F:
case BitmapFormat.V8U8:
break;
case BitmapFormat.Dxt1:
case BitmapFormat.Dxt3:
case BitmapFormat.Dxt5:
case BitmapFormat.Dxn:
if (bitmap.Height != bitmap.NearestHeight || bitmap.Width != bitmap.NearestWidth)
{
targetFormat = BitmapFormat.A8R8G8B8;
bitmap.Flags &= ~BitmapFlags.Compressed;
DXTFlip = true;
}
break;
case BitmapFormat.Ctx1:
bitmap.UpdateFormat(BitmapFormat.Dxn);
data = BitmapDecoder.Ctx1ToDxn(data, bitmap.NearestWidth, bitmap.NearestHeight);
targetFormat = BitmapFormat.Dxn;
break;
default:
throw new Exception($"Unsupported bitmap format {bitmap.Format}");
}
if (targetFormat != bitmap.Format)
{
data = BitmapDecoder.DecodeBitmap(data, bitmap.Format, bitmap.NearestWidth, bitmap.NearestHeight);
data = BitmapDecoder.EncodeBitmap(data, targetFormat, bitmap.NearestWidth, bitmap.NearestHeight);
bool reformat = false;
if (bitmap.NearestHeight != bitmap.Height || bitmap.NearestWidth != bitmap.Width)
{
reformat = true;
}
if (reformat)
{
var compressionFactor = BitmapFormatUtils.GetCompressionFactor(targetFormat);
int fixedSize = (int)(bitmap.Width * bitmap.Height / compressionFactor);
int tilePitch = (int)(bitmap.NearestWidth / compressionFactor);
int pitch = (int)(bitmap.Width / compressionFactor);
byte[] fixedData = new byte[fixedSize];
int numberOfPass = bitmap.Height; // encode does not give back block compressed data.
for (int i = 0; i < numberOfPass; i++) // may need to compute an offset for special bitmaps
{
Array.Copy(data, i * tilePitch, fixedData, i * pitch, pitch);
}
data = fixedData;
}
bitmap.UpdateFormat(targetFormat);
bitmap.Data = data;
}
bitmap.Data = data;
if (DXTFlip)
{
return(false);
}
return(true);
}
