How to switch from ARGB to BGRA colors?
simon.moore at teradyne.com
Tue Aug 21 14:12:30 PDT 2007
>>> You can just use the redMask/blueMask/greenMask attributes in your video
>>> driver's ScreenInit hook to specify the order.
We did this. Unfortunately, not everything worked. Our first attempt was
to was to try to use Xfbdev: this crashed with BGRA colour
(FBDEV_KLUDGE_FORMAT needed to be removed for BRGA).
>> Yeah, I fundled around with things like that in the driver. However
>> when it comes to font aliasing, things broke again. The transparency
>> around the characters of antialiased fonts didn't still appear right.
>> The alpha channel seems to be ignored here.
> This is probably just FreeType assuming your subpixel ordering is RGB
> instead of BGR (subpixel layout being independent of framebuffer byte
> ordering); this is configurable through Xft, et al.
Now switched to using the Xorg 501 driver. We have seen issue with yellow
shadowing around fonts. This looks similar to an issue we 'corrected' when
using acceleration. This was caused by the use of an int for colour in the
acceleration functions. We end up 0x7FFFFFxx for white instead of
0xFFFFFFxx. I'll let you know if we get anywhere with the fonts.
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