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atmel_lcdfb: use spare bits in 32bpp mode as alpha channel

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Set var->transp.offset and var->transp.length in 32bpp mode to indicate
that the 8 otherwise unused bits can be used for transparency.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@rfo.atmel.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Haavard Skinnemoen
2007-07-21 04:38:02 -07:00
committed by Linus Torvalds
parent 7cc90249ff
commit 4440e0e11d
1 changed files with 4 additions and 1 deletions
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5
drivers/video/atmel_lcdfb.c
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@@ -219,8 +219,11 @@ static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
var->blue.offset = 10; var->blue.offset = 10;
var->red.length = var->green.length = var->blue.length = 5; var->red.length = var->green.length = var->blue.length = 5;
break; break;
case 24:
case 32: case 32:
var->transp.offset = 24;
var->transp.length = 8;
/* fall through */
case 24:
var->red.offset = 0; var->red.offset = 0;
var->green.offset = 8; var->green.offset = 8;
var->blue.offset = 16; var->blue.offset = 16;