DDS file is scrambled up, how do I fix?

[daddio]

I have a DDS image that is scrambled somehow. It was unpacked from a XPR file. Any clue how to unscramble the image? I can't load the DDS file as attachment here for you to work with but will attach as a JPG if that would help.

[Mr.Mouse]

I have a DDS image that is scrambled somehow. It was unpacked from a XPR file. Any clue how to unscramble the image? I can't load the DDS file as attachment here for you to work with but will attach as a JPG if that would help.

Why not zip it first and then attach it?

Also, you may want to read this: viewtopic.php?t=1048&highlight=xpr

The DDS files have missing headers, if I'm not mistaken. You can replace / add them yourself.

[brienj]

I have a DDS image that is scrambled somehow. It was unpacked from a XPR file. Any clue how to unscramble the image? I can't load the DDS file as attachment here for you to work with but will attach as a JPG if that would help.

This sounds like an image for an Xbox game, since it is the most common platform to do it to DDS files, but I would bet that the DDS file is swizzled. There are a few threads at Xbox Scene that explain swizzled DDS images. There are no programs made, just to unswizzle/reswizzle DDS files, they are usually part of other programs that also extract the DDS files. It's mainly trial and error on finding the correct swizzle algorithm that is being used on the DDS file, but they all follow a similar pattern. Hope this has helped you some.

[daddio]

I'm sure your correct. its a Forza image file. The rar is too large to attach from here. I will try to find a site to upload it to and post a link to the orignal file.

[jasmine]

Here's a code algorithm for xbox swizzle and unswizzle

Code: Select all

void UnSwizzle(void *ReadArray, void *WriteArray,unsigned long int &ReadOffset,unsigned long int WriteOffset, unsigned long int SegWidth, unsigned long int SegHeight, unsigned long int DataWidth)
{
	if(SegWidth == 2 && SegHeight == 2)
	{
       ((byte *)WriteArray)[WriteOffset                ] = ((byte *)ReadArray)[ReadOffset + 0];
       ((byte *)WriteArray)[WriteOffset + 1            ] = ((byte *)ReadArray)[ReadOffset + 1];
       ((byte *)WriteArray)[WriteOffset + DataWidth    ] = ((byte *)ReadArray)[ReadOffset + 2];
       ((byte *)WriteArray)[WriteOffset + DataWidth + 1] = ((byte *)ReadArray)[ReadOffset + 3];
	   ReadOffset += 4;
	}
	else
	{
		UnSwizzle(ReadArray, WriteArray, ReadOffset, WriteOffset, SegWidth/2, SegHeight/2, DataWidth);
		UnSwizzle(ReadArray, WriteArray, ReadOffset, WriteOffset + SegWidth/2, SegWidth/2, SegHeight/2, DataWidth);
		UnSwizzle(ReadArray, WriteArray, ReadOffset, WriteOffset + DataWidth*(SegHeight/2), SegWidth/2, SegHeight/2, DataWidth);
		UnSwizzle(ReadArray, WriteArray, ReadOffset, WriteOffset + DataWidth*(SegHeight/2) + SegWidth/2, SegWidth/2, SegHeight/2, DataWidth);
	}
}

void Swizzle(void *WriteArray, void *ReadArray, unsigned long int &WriteOffset, unsigned long int ReadOffset, unsigned long int SegWidth, unsigned long int SegHeight, unsigned long int DataWidth)
{
	if(SegWidth == 2 && SegHeight == 2)
	{
       ((byte *)WriteArray)[WriteOffset                ] = ((byte *)ReadArray)[ReadOffset + 0];
       ((byte *)WriteArray)[WriteOffset + 1            ] = ((byte *)ReadArray)[ReadOffset + 1];
       ((byte *)WriteArray)[WriteOffset + 2            ] = ((byte *)ReadArray)[ReadOffset + DataWidth];
       ((byte *)WriteArray)[WriteOffset + 3            ] = ((byte *)ReadArray)[ReadOffset + DataWidth + 1];
	   WriteOffset += 4;
	}
	else
	{
		Swizzle(WriteArray, ReadArray, WriteOffset, ReadOffset, SegWidth/2, SegHeight/2, DataWidth);
		Swizzle(WriteArray, ReadArray, WriteOffset, ReadOffset + SegWidth/2, SegWidth/2, SegHeight/2, DataWidth);
		Swizzle(WriteArray, ReadArray, WriteOffset, ReadOffset + DataWidth*(SegHeight/2), SegWidth/2, SegHeight/2, DataWidth);
		Swizzle(WriteArray, ReadArray, WriteOffset, ReadOffset + DataWidth*(SegHeight/2) + SegWidth/2, SegWidth/2, SegHeight/2, DataWidth);
	}
}

[Mr.Mouse]

Nice one !