Gerd Knorr wrote: > > > I have seen some mmx filters, and even some hardware, that requires the > > lines to be DWORD or QWORD aligned. > > No problem with the common image sizes, lines will be aligned even > without any padding: > > NTSC: 640 = 2^7 * 5 > PAL: 768 = 2^8 * 3 > > The common DCT-based compression algorithms want image width be > a multiple of 8 or 16 because the DCT blocks are 8x8 (luma needs > to be 16 then because of chroma subsampling). That will give > you qword aligned lines without padding too. > > > Granted, this is rare, > > ... and would be a problem only if you want to use image sizes > like 389 * 251. Is this really a problem? > > Gerd It probably isn't a problem, but I don't see any reason not to support it - even if it is only for a few very specific applications. After all - most of your changes are pretty much non backward compatible anyway, so why not break the bytesperline thing as well, and keep the API as universal as possible? -justin
