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From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Marcelo Tosatti <marcelo@conectiva.com.br>
Cc: Linux Fbdev <linux-fbdev-devel@lists.sourceforge.net>,
	Linux Kernel Development <linux-kernel@vger.kernel.org>,
	Geert Uytterhoeven <geert@linux-m68k.org>
Subject: [PATCH] fb_cmap and transparency
Date: Fri, 29 Aug 2003 16:49:45 +0200	[thread overview]
Message-ID: <200308291449.h7TEnjX7005827@callisto.of.borg> (raw)

If a colormap contains no transparency information, fb_set_cmap() calls
fb_setcolreg() with trans = 0. This causes all CLUT entries to be fully
transparent on hardware that does have transparency information in the CLUT
registers.

The following patch solves this problem by changing the default transparency
from 0 (full transparent) to 0xffff (full opaque).

--- linux-2.4.23-pre1/drivers/video/fbcmap.c.orig	Mon Mar  5 09:29:30 2001
+++ linux-2.4.23-pre1/drivers/video/fbcmap.c	Mon Mar 17 17:39:59 2003
@@ -271,7 +271,7 @@
 	    hred = *red;
 	    hgreen = *green;
 	    hblue = *blue;
-	    htransp = transp ? *transp : 0;
+	    htransp = transp ? *transp : 0xffff;
 	} else {
 	    get_user(hred, red);
 	    get_user(hgreen, green);
@@ -279,7 +279,7 @@
 	    if (transp)
 		get_user(htransp, transp);
 	    else
-		htransp = 0;
+		htransp = 0xffff;
 	}
 	red++;
 	green++;

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

             reply	other threads:[~2003-08-29 14:52 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-08-29 14:49 Geert Uytterhoeven [this message]
  -- strict thread matches above, loose matches on Subject: below --
2003-06-15 19:10 Geert Uytterhoeven

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