diff options
| author | H. Peter Anvin <hpa@zytor.com> | 2009-12-22 15:52:41 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-12-22 15:52:41 -0800 |
| commit | 46202699d83202808e67358739d1889982c825ae (patch) | |
| tree | 944ec78034346e359ddf3e75adac15f2743c8fd4 /com32/lib | |
| parent | 6c7159d13c948afcc067635d0cc0c6aae39a04bf (diff) | |
| download | syslinux-46202699d83202808e67358739d1889982c825ae.tar.gz syslinux-46202699d83202808e67358739d1889982c825ae.tar.xz syslinux-46202699d83202808e67358739d1889982c825ae.zip | |
vesamenu: unbreak the default background
Unbreak the default background image; it would clobber all of memory.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'com32/lib')
| -rw-r--r-- | com32/lib/sys/vesa/background.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/com32/lib/sys/vesa/background.c b/com32/lib/sys/vesa/background.c index 256c8247..2e573846 100644 --- a/com32/lib/sys/vesa/background.c +++ b/com32/lib/sys/vesa/background.c @@ -217,18 +217,25 @@ err: int vesacon_default_background(void) { int x, y, dx, dy, dy2; - uint8_t *bgptr = (uint8_t *) & __vesacon_background; + int z; + unsigned int shft; + uint8_t *bgptr = (uint8_t *)__vesacon_background; uint8_t k; if (__vesacon_pixel_format == PXF_NONE) return 0; /* Not in graphics mode */ - for (y = 0, dy = -__vesa_info.mi.v_res / 2; + z = max(__vesa_info.mi.v_res, __vesa_info.mi.h_res) >> 1; + z = ((z*z) >> 11) - 1; + asm("bsrl %1,%0" : "=r" (shft) : "rm" (z)); + shft++; + + for (y = 0, dy = -(__vesa_info.mi.v_res >> 1); y < __vesa_info.mi.v_res; y++, dy++) { dy2 = dy * dy; - for (x = 0, dx = -__vesa_info.mi.h_res / 2; + for (x = 0, dx = -(__vesa_info.mi.h_res >> 1); x < __vesa_info.mi.h_res; x++, dx++) { - k = __vesacon_linear_to_srgb[500 + ((dx * dx + dy2) >> 6)]; + k = __vesacon_linear_to_srgb[500 + ((dx*dx + dy2) >> shft)]; bgptr[0] = k; /* Blue */ bgptr[1] = k; /* Green */ bgptr[2] = k; /* Red */ |