🔒 Locked

24 bit graphics question

Started by Buster Nov 3, 2000 at 4:22 PM 0 replies 500+ views

Original Post

Nov 3, 2000 at 4:22 PM

Here''s a stupid question, so pardon me if I should know!

Writing out 16 bit data (WORD) and 32 bit data (DWORD) to a surface is easy. But what do I use for 24 bit data? Do I need to use a DWORD, but bust it up into 3 bytes? Here''s what I do for 16 bits: *(WORD*) bDes = (WORD)color; Here''s what I do for 32 bits: *(DWORD*) bDes = (DWORD)color; For 24 bits: ???? Thanks for any tips you guys can provide... and again sorry if I''m just being retarded!

bogdanontanu

Nov 3, 2000 at 7:22 PM

Yeah its kinda tricky... maybe thats why some boards just skip 24bits and jump directly to 32bits

if are doing a Blit like ops try write a full DWORD row and then add an extra byte if req at the end.

If u do per pixel operations ... eh then read a dword mask its 4th byte do what ever u want on the rest of 3 bytes and the write a full DWORD back...cache can help u here but i think this i slow....

Bogdan

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.