On Thu, 2002-12-12 at 08:41, Paul Mackerras wrote:
> This patch fixes the endian problems in color_imageblit(). With this
> patch, I get the penguin drawn properly on boot.
>
> The main change is that on big-endian systems, when we load a pixel
> from the source, we now shift it to the left-hand (most significant)
> end of the word. With this change the rest of the logic is correct on
> big-endian systems. This may not be the most efficient way to do
> things but it is a simple change that works and avoids disturbing the
> rest of the code.
>
Nice catch :-) We also need a similar fix for slow_imageblit(), so
James can you apply the attached patch also:
Also, I noticed that some drivers load the pseudo_palette with entries
whose length matches the length of the pixel. The cfb_* functions
always assume that each pseudo_palette entry is an "unsigned long", so
bpp16 will segfault, and so will bpp24/32 for 64-bit machines.
Tony
diff -Naur linux-2.5.51/drivers/video/cfbimgblt.c linux/drivers/video/cfbimgblt.c
--- linux-2.5.51/drivers/video/cfbimgblt.c 2002-12-15 00:54:04.000000000 +0000
+++ linux/drivers/video/cfbimgblt.c 2002-12-15 00:54:21.000000000 +0000
@@ -189,6 +189,7 @@
color = fgcolor;
else
color = bgcolor;
+ color <<= LEFT_POS(bpp);
val |= SHIFT_HIGH(color, shift);
/* Did the bitshift spill bits to the next long? */
Tony
-
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This archive was generated by hypermail 2b29 : Sun Dec 15 2002 - 22:00:31 EST