public static SKImage DecodeImage(byte[] sequence, int width, int height, int depth, EPixelFormat format)
{
byte[] data;
SKColorType colorType;
switch (format)
{
case EPixelFormat.PF_DXT5:
data = DXTDecoder.DecodeDXT5(sequence, width, height, depth);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_DXT1:
data = DXTDecoder.DecodeDXT1(sequence, width, height, depth);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_ASTC_8x8:
var x = (int)TextureFormatHelper.GetBlockWidth(format);
var y = (int)TextureFormatHelper.GetBlockHeight(format);
var z = (int)TextureFormatHelper.GetBlockDepth(format);
data = ASTCDecoder.DecodeToRGBA8888(sequence, x, y, z, width, height, 1);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_B8G8R8A8:
data = sequence;
colorType = SKColorType.Bgra8888;
break;
case EPixelFormat.PF_BC5:
data = BCDecoder.DecodeBC5(sequence, width, height);
colorType = SKColorType.Rgb888x;
break;
case EPixelFormat.PF_BC4:
data = BCDecoder.DecodeBC4(sequence, width, height);
colorType = SKColorType.Rgb888x;
break;
case EPixelFormat.PF_G8:
data = sequence;
colorType = SKColorType.Gray8;
break;
case EPixelFormat.PF_FloatRGBA:
data = sequence;
colorType = SKColorType.RgbaF16;
break;
case EPixelFormat.PF_BC7:
data = Detex.DecodeDetexLinear(sequence, width, height, isFloat: false,
inputFormat: DetexTextureFormat.DETEX_TEXTURE_FORMAT_BPTC,
outputPixelFormat: DetexPixelFormat.DETEX_PIXEL_FORMAT_RGBA8);
colorType = SKColorType.Rgb888x;
break;
case EPixelFormat.PF_BC6H:
data = Detex.DecodeDetexLinear(sequence, width, height, isFloat: true,
inputFormat: DetexTextureFormat.DETEX_TEXTURE_FORMAT_BPTC_FLOAT,
outputPixelFormat: DetexPixelFormat.DETEX_PIXEL_FORMAT_RGBX8); // Not sure whether that works, would actually be DETEX_PIXEL_FORMAT_FLOAT_RGBX32
data = Detex.DecodeBC6H(sequence, width, height);
colorType = SKColorType.Rgb888x;
break;
case EPixelFormat.PF_ETC1:
data = Detex.DecodeDetexLinear(sequence, width, height, isFloat: false,
inputFormat: DetexTextureFormat.DETEX_TEXTURE_FORMAT_ETC1,
outputPixelFormat: DetexPixelFormat.DETEX_PIXEL_FORMAT_RGBA8);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_ETC2_RGB:
data = Detex.DecodeDetexLinear(sequence, width, height, isFloat: false,
inputFormat: DetexTextureFormat.DETEX_TEXTURE_FORMAT_ETC2,
outputPixelFormat: DetexPixelFormat.DETEX_PIXEL_FORMAT_RGBA8);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_ETC2_RGBA:
data = Detex.DecodeDetexLinear(sequence, width, height, isFloat: false,
inputFormat: DetexTextureFormat.DETEX_TEXTURE_FORMAT_ETC2_EAC,
outputPixelFormat: DetexPixelFormat.DETEX_PIXEL_FORMAT_RGBA8);
colorType = SKColorType.Rgba8888;
break;
default:
throw new NotImplementedException($"Cannot decode {format} format");
}
using var bitmap = new SKBitmap(new SKImageInfo(width, height, colorType, SKAlphaType.Unpremul));
unsafe
{
fixed(byte *p = data)
{
bitmap.SetPixels(new IntPtr(p));
}
}
return(SKImage.FromBitmap(bitmap));
}
