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fbdev: fix fillrect for 24bpp modes

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The software fillrect routines do not work properly when the number of
pixels per machine word is not an integer.  To see that, run the following
command on a fbdev console with a 24bpp video mode, using a
non-accelerated driver such as (u)vesafb:

  reset ; echo -e '\e[41mtest\e[K'

The expected result is 'test' displayed on a line with red background.
Instead of that, 'test' has a red background, but the rest of the line
(rendered using fillrect()) contains a distored colorful pattern.

This patch fixes the problem by correctly computing rotation shifts.  It
has been tested in a 24bpp mode on 32- and 64-bit little-endian machines.

Signed-off-by: Michal Januszewski <spock@gentoo.org>
Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Januszewski 2009-05-06 16:02:56 -07:00 committed by Linus Torvalds
parent 184101bf14
commit bdca0f9b1e
3 changed files with 48 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/video/cfbfillrect.c
View File

@ -9,10 +9,6 @@
*
* NOTES:
*
* The code for depths like 24 that don't have integer number of pixels per
* long is broken and needs to be fixed. For now I turned these types of
* mode off.
*
* Also need to add code to deal with cards endians that are different than
* the native cpu endians. I also need to deal with MSB position in the word.
*
@ -139,7 +135,7 @@ bitfill_unaligned(struct fb_info *p, unsigned long __iomem *dst, int dst_idx,
// Trailing bits
if (last)
FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
FB_WRITEL(comp(pat, FB_READL(dst), last), dst);
}
}
@ -281,7 +277,7 @@ bitfill_unaligned_rev(struct fb_info *p, unsigned long __iomem *dst,
void cfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
{
unsigned long pat, fg;
unsigned long pat, pat2, fg;
unsigned long width = rect->width, height = rect->height;
int bits = BITS_PER_LONG, bytes = bits >> 3;
u32 bpp = p->var.bits_per_pixel;
@ -297,7 +293,7 @@ void cfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
else
fg = rect->color;
pat = pixel_to_pat( bpp, fg);
pat = pixel_to_pat(bpp, fg);
dst = (unsigned long __iomem *)((unsigned long)p->screen_base & ~(bytes-1));
dst_idx = ((unsigned long)p->screen_base & (bytes - 1))*8;
@ -333,17 +329,16 @@ void cfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
dst_idx += p->fix.line_length*8;
}
} else {
int right;
int r;
int rot = (left-dst_idx) % bpp;
int right, r;
void (*fill_op)(struct fb_info *p, unsigned long __iomem *dst,
int dst_idx, unsigned long pat, int left,
int right, unsigned n, int bits) = NULL;
/* rotate pattern to correct start position */
pat = pat << rot | pat >> (bpp-rot);
right = bpp-left;
#ifdef __LITTLE_ENDIAN
right = left;
left = bpp - right;
#else
right = bpp - left;
#endif
switch (rect->rop) {
case ROP_XOR:
fill_op = bitfill_unaligned_rev;
@ -352,17 +347,18 @@ void cfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
fill_op = bitfill_unaligned;
break;
default:
printk( KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
printk(KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
fill_op = bitfill_unaligned;
break;
}
while (height--) {
dst += dst_idx >> (ffs(bits) - 1);
dst += dst_idx / bits;
dst_idx &= (bits - 1);
fill_op(p, dst, dst_idx, pat, left, right,
r = dst_idx % bpp;
/* rotate pattern to the correct start position */
pat2 = le_long_to_cpu(rolx(cpu_to_le_long(pat), r, bpp));
fill_op(p, dst, dst_idx, pat2, left, right,
width*bpp, bits);
r = (p->fix.line_length*8) % bpp;
pat = pat << (bpp-r) | pat >> r;
dst_idx += p->fix.line_length*8;
}
}

21
drivers/video/fb_draw.h
View File

@ -33,11 +33,11 @@ pixel_to_pat( u32 bpp, u32 pixel)
case 8:
return 0x0101010101010101ul*pixel;
case 12:
return 0x0001001001001001ul*pixel;
return 0x1001001001001001ul*pixel;
case 16:
return 0x0001000100010001ul*pixel;
case 24:
return 0x0000000001000001ul*pixel;
return 0x0001000001000001ul*pixel;
case 32:
return 0x0000000100000001ul*pixel;
default:
@ -58,11 +58,11 @@ pixel_to_pat( u32 bpp, u32 pixel)
case 8:
return 0x01010101ul*pixel;
case 12:
return 0x00001001ul*pixel;
return 0x01001001ul*pixel;
case 16:
return 0x00010001ul*pixel;
case 24:
return 0x00000001ul*pixel;
return 0x01000001ul*pixel;
case 32:
return 0x00000001ul*pixel;
default:
@ -167,4 +167,17 @@ static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
#endif /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
#define cpu_to_le_long _cpu_to_le_long(BITS_PER_LONG)
#define _cpu_to_le_long(x) __cpu_to_le_long(x)
#define __cpu_to_le_long(x) cpu_to_le##x
#define le_long_to_cpu _le_long_to_cpu(BITS_PER_LONG)
#define _le_long_to_cpu(x) __le_long_to_cpu(x)
#define __le_long_to_cpu(x) le##x##_to_cpu
static inline unsigned long rolx(unsigned long word, unsigned int shift, unsigned int x)
{
return (word << shift) | (word >> (x - shift));
}
#endif /* FB_DRAW_H */

30
drivers/video/sysfillrect.c
View File

@ -124,7 +124,7 @@ bitfill_unaligned(struct fb_info *p, unsigned long *dst, int dst_idx,
/* Trailing bits */
if (last)
*dst = comp(pat, *dst, first);
*dst = comp(pat, *dst, last);
}
}
@ -242,7 +242,7 @@ bitfill_unaligned_rev(struct fb_info *p, unsigned long *dst, int dst_idx,
void sys_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
{
unsigned long pat, fg;
unsigned long pat, pat2, fg;
unsigned long width = rect->width, height = rect->height;
int bits = BITS_PER_LONG, bytes = bits >> 3;
u32 bpp = p->var.bits_per_pixel;
@ -292,17 +292,16 @@ void sys_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
dst_idx += p->fix.line_length*8;
}
} else {
int right;
int r;
int rot = (left-dst_idx) % bpp;
int right, r;
void (*fill_op)(struct fb_info *p, unsigned long *dst,
int dst_idx, unsigned long pat, int left,
int right, unsigned n, int bits) = NULL;
/* rotate pattern to correct start position */
pat = pat << rot | pat >> (bpp-rot);
right = bpp-left;
#ifdef __LITTLE_ENDIAN
right = left;
left = bpp - right;
#else
right = bpp - left;
#endif
switch (rect->rop) {
case ROP_XOR:
fill_op = bitfill_unaligned_rev;
@ -311,18 +310,19 @@ void sys_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
fill_op = bitfill_unaligned;
break;
default:
printk(KERN_ERR "cfb_fillrect(): unknown rop, "
printk(KERN_ERR "sys_fillrect(): unknown rop, "
"defaulting to ROP_COPY\n");
fill_op = bitfill_unaligned;
break;
}
while (height--) {
dst += dst_idx >> (ffs(bits) - 1);
dst += dst_idx / bits;
dst_idx &= (bits - 1);
fill_op(p, dst, dst_idx, pat, left, right,
r = dst_idx % bpp;
/* rotate pattern to the correct start position */
pat2 = le_long_to_cpu(rolx(cpu_to_le_long(pat), r, bpp));
fill_op(p, dst, dst_idx, pat2, left, right,
width*bpp, bits);
r = (p->fix.line_length*8) % bpp;
pat = pat << (bpp-r) | pat >> r;
dst_idx += p->fix.line_length*8;
}
}