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Bug 7

Summary: Flipped blitters...
Product: SDL Reporter: Ryan C. Gordon <icculus>
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED WONTFIX QA Contact: Sam Lantinga <slouken>
Severity: API change    
Priority: P2 CC: max
Version: HG 1.2   
Hardware: All   
OS: All   
Attachments: Flipped blitters patch

Description Ryan C. Gordon 2006-01-03 11:44:11 UTC 
From: Gabriel <mystml@adinet.com.uy>
To: SDL Mailing List <sdl@libsdl.org>
Date: Thu, 26 May 2005 19:44:34 -0300
Subject: [SDL] Flipped blitters patch

Here's a first (read : incomplete, buggy, slow) implementation of the
flipped blitters for your testing pleasure. The diff is against the SDL
1.2.8 tar.gz package from libsdl.org.

What works : all the blitters in SDL_blit_A.c and SDL_BlitCopy(). This
means blitting any surface with alpha over any surface should work. 

How to use : and pSurface->flags with SDL_HFLIP or SDL_VFLIP (vflip not
working for SDL_BlitCopy()) and blit. I've included a quite simple test
program.

Actually, the only *slow* blitter is SDL_BlitCopy(). The alpha blitters
should be as fast as the non-flipped blitters, with SSE and MMX and all.

Still a lot to do and fix, but this is a start...

	--Gabriel
Comment 1 Ryan C. Gordon 2006-01-03 11:44:42 UTC 
Created attachment 5 [details]
Flipped blitters patch
Comment 2 Ryan C. Gordon 2006-01-05 02:33:44 UTC 
(Changed severity to "API change" for a bunch of bugs.)

--ryan.
Comment 3 Ryan C. Gordon 2006-01-27 11:23:01 UTC 
Setting Sam as "QA Contact" on all bugs (even resolved ones) so he'll definitely be in the loop to any further discussion here about SDL.

--ryan.
Comment 4 Max Horn 2006-03-22 13:12:04 UTC 
Could somebody add an explanation here what exactly "flipped blitters" are and what they are good for? :-)
Comment 5 Sam Lantinga 2006-04-27 04:41:57 UTC 
(In reply to comment #4)
> Could somebody add an explanation here what exactly "flipped blitters" are and
> what they are good for? :-)
> 

It's basically a way to get mirrored and rotated sprites without using extra memory to store the images.
Comment 6 Ryan C. Gordon 2006-10-28 20:33:03 UTC 
Tossing this bug to Sam to do what he wants with it.

--ryan.
Comment 7 Sam Lantinga 2007-07-05 22:24:23 UTC 
Keeping this for future reference, but at this point I think it's not going to be added to SDL 1.2