Michel Dänzer wrote: > On Tue, 2008-02-12 at 18:50 +0200, Ville Syrjälä wrote: >> On Tue, Feb 12, 2008 at 03:01:53PM +0100, Denis Oliver Kropp wrote: >>> RGB24 is weird. Does anybody know which is the real standard byte order and >>> endianness dependency? >> I don't think anyone agrees on this stuff. Many people don't even agree >> how the easier formats are arranged (ie. sometimes when you read the >> name left-to-right is msb-to-lsb, sometimes the other way around). >> >> One thing that might serve as a rule is that you should be able to copy >> RGB32 to RGB24 by simply walking both streams byte at a time and >> copying the relevant bytes (and skipping the extra bytes in RGB32). And >> since out RGB32 is native endian that implies that RGB24/BGR24 are >> stored in native endian format as well. > > Actually, as the greatest common denominator between 3 and the CPU word > size is 1, the endianness concept doesn't really make sense with RGB24 > but it can just be treated as a byte stream of colour components in a > defined order, similar to how the characters of a C string always have > the same order regardless of endianness.
That's what I thought, like NV12 having a defined order of 16bit words regardless of the endianness (chroma plane). -- Best regards, Denis Oliver Kropp .------------------------------------------. | DirectFB - Hardware accelerated graphics | | http://www.directfb.org/ | "------------------------------------------" _______________________________________________ directfb-dev mailing list directfb-dev@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev
