Bug 11938

Summary:	Text is drawn with red and blue channels swapped on ABGR hardware
Product:	cairo	Reporter:	Michael Lorenz <macallan>
Component:	xlib backend	Assignee:	Carl Worth <cworth>
Status:	RESOLVED DUPLICATE	QA Contact:	cairo-bugs mailing list <cairo-bugs>
Severity:	normal
Priority:	medium
Version:	1.4.10
Hardware:	SPARC
OS:	NetBSD
Whiteboard:
i915 platform:		i915 features:

Description Michael Lorenz 2007-08-10 22:08:31 UTC

Text is drawn with red and blue channels swapped on ABGR hardware, like Sun ffb2+ graphics boards. I filed a bug report about that against Cairo 1.0 and it's been fixed - apparently it's back now.

Comment 1 Michael Lorenz 2007-08-10 22:53:44 UTC

After some experimentation I found this:
- with anti-aliasing disabled text colours are right
- with anti-aliasing and sub-pixel hinting enabled colours are right too
- with anti-aliasing enabled but sub-pixel hinting disabled colours are wrong

Comment 2 Chris Wilson 2008-10-10 06:48:55 UTC


*** This bug has been marked as a duplicate of bug 5112 ***

Comment 3 Mikhail Zabaluev 2008-10-10 08:14:39 UTC

(In reply to comment #2)
> 
> *** This bug has been marked as a duplicate of bug 5112 ***

You most probably meant some other bug.

Comment 4 Michael Lorenz 2008-10-10 08:19:20 UTC

Indeed.
By the way, I found that the problem may not be in cairo after all - there are still plenty of RGB vs. BGR problems in the Xserver's XRENDER code - half of it ( like rgb32 x a8 -> rgb32 )  assumes that source and destination pixmap always use the same pixel format which is clearly bogus.

Comment 5 Chris Wilson 2008-10-10 13:51:10 UTC

I meant bug 5212, of which the cairo portion is a dup of. XRender only operates on surfaces of identical format and if cairo feed in argb32 x a8, then that would be a serious bug in cairo.

Thanks for checking.

*** This bug has been marked as a duplicate of bug 5212 ***

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