diff options
| author | Søren Sandmann Pedersen <sandmann@daimi.au.dk> | 2005-08-12 18:47:17 +0000 |
|---|---|---|
| committer | Søren Sandmann Pedersen <sandmann@daimi.au.dk> | 2005-08-12 18:47:17 +0000 |
| commit | 1eed84f227311730ce1f9ffab190e95de967c7da (patch) | |
| tree | 745829a5a8aec62d678bdb0bd036592d5f778070 /fb/fbpict.h | |
| parent | 8bfffb96b552a3facb77ff9e81658e80becbf2f4 (diff) | |
Fri Aug 12 14:45:54 2005 Søren Sandmann <sandmann@redhat.com>
Fix up multiplications based on patch by Billy Biggs. Part of bug 3945.
Diffstat (limited to 'fb/fbpict.h')
| -rw-r--r-- | fb/fbpict.h | 50 |
1 files changed, 27 insertions, 23 deletions
diff --git a/fb/fbpict.h b/fb/fbpict.h index ab44bfa66..0e6a7f4ff 100644 --- a/fb/fbpict.h +++ b/fb/fbpict.h @@ -148,12 +148,12 @@ x_c = (x_c * a) / 255 */ #define FbByteMul(x, a) do { \ - CARD32 t = (x & 0xff00ff) *a; \ - t = (t + ((t >> 8) & 0xff00ff) + 0x800080) >> 8; \ + CARD32 t = ((x & 0xff00ff) * a) + 0x800080; \ + t = (t + ((t >> 8) & 0xff00ff)) >> 8; \ t &= 0xff00ff; \ \ - x = ((x >> 8) & 0xff00ff) * a; \ - x = (x + ((x >> 8) & 0xff00ff) + 0x800080); \ + x = (((x >> 8) & 0xff00ff) * a) + 0x800080; \ + x = (x + ((x >> 8) & 0xff00ff)); \ x &= 0xff00ff00; \ x += t; \ } while (0) @@ -162,15 +162,15 @@ x_c = (x_c * a) / 255 + y */ #define FbByteMulAdd(x, a, y) do { \ - CARD32 t = (x & 0xff00ff) * a; \ - t = (t + ((t >> 8) & 0xff00ff) + 0x800080) >> 8; \ + CARD32 t = ((x & 0xff00ff) * a) + 0x800080; \ + t = (t + ((t >> 8) & 0xff00ff)) >> 8; \ t &= 0xff00ff; \ t += y & 0xff00ff; \ t |= 0x1000100 - ((t >> 8) & 0xff00ff); \ t &= 0xff00ff; \ \ - x = ((x >> 8) & 0xff00ff) * a; \ - x = (x + ((x >> 8) & 0xff00ff) + 0x800080) >> 8; \ + x = (((x >> 8) & 0xff00ff) * a) + 0x800080; \ + x = (x + ((x >> 8) & 0xff00ff)) >> 8; \ x &= 0xff00ff; \ x += (y >> 8) & 0xff00ff; \ x |= 0x1000100 - ((t >> 8) & 0xff00ff); \ @@ -184,8 +184,8 @@ */ #define FbByteAddMul(x, a, y, b) do { \ CARD32 t; \ - CARD32 r = (x >> 24) * a + (y >> 24) * b; \ - r += (r >> 8) + 0x80; \ + CARD32 r = (x >> 24) * a + (y >> 24) * b + 0x80; \ + r += (r >> 8); \ r >>= 8; \ \ t = (x & 0xff00) * a + (y & 0xff00) * b; \ @@ -197,12 +197,12 @@ t &= 0xff00ff; \ t <<= 8; \ \ - r = ((x >> 16) & 0xff) * a + ((y >> 16) & 0xff) * b; \ - r += (r >> 8) + 0x80; \ + r = ((x >> 16) & 0xff) * a + ((y >> 16) & 0xff) * b + 0x80; \ + r += (r >> 8); \ r >>= 8; \ \ - x = (x & 0xff) * a + (y & 0xff) * b; \ - x += (x >> 8) + 0x80; \ + x = (x & 0xff) * a + (y & 0xff) * b + 0x80; \ + x += (x >> 8); \ x >>= 8; \ x |= r << 16; \ x |= 0x1000100 - ((x >> 8) & 0xff00ff); \ @@ -229,13 +229,15 @@ CARD32 t; \ CARD32 r = (x & 0xff) * (a & 0xff); \ r |= (x & 0xff0000) * ((a >> 16) & 0xff); \ - r = (r + ((r >> 8) & 0xff00ff) + 0x800080) >> 8; \ + r += 0x800080; \ + r = (r + ((r >> 8) & 0xff00ff)) >> 8; \ r &= 0xff00ff; \ \ x >>= 8; \ t = (x & 0xff) * ((a >> 8) & 0xff); \ t |= (x & 0xff0000) * (a >> 24); \ - t = (t + ((t >> 8) & 0xff00ff) + 0x800080); \ + t += 0x800080; \ + t = t + ((t >> 8) & 0xff00ff); \ x = r | (t & 0xff00ff00); \ \ } while (0) @@ -247,7 +249,8 @@ CARD32 t; \ CARD32 r = (x & 0xff) * (a & 0xff); \ r |= (x & 0xff0000) * ((a >> 16) & 0xff); \ - r = (r + ((r >> 8) & 0xff00ff) + 0x800080) >> 8; \ + r += 0x800080; \ + r = (r + ((r >> 8) & 0xff00ff)) >> 8; \ r &= 0xff00ff; \ r += y & 0xff00ff; \ r |= 0x1000100 - ((r >> 8) & 0xff00ff); \ @@ -256,7 +259,8 @@ x >>= 8; \ t = (x & 0xff) * ((a >> 8) & 0xff); \ t |= (x & 0xff0000) * (a >> 24); \ - t = (t + ((t >> 8) & 0xff00ff) + 0x800080) >> 8; \ + t += 0x800080; \ + t = (t + ((t >> 8) & 0xff00ff)) >> 8; \ t &= 0xff00ff; \ t += (y >> 8) & 0xff00ff; \ t |= 0x1000100 - ((t >> 8) & 0xff00ff); \ @@ -282,12 +286,12 @@ t &= 0xff00ff; \ t <<= 8; \ \ - r = ((x >> 16) & 0xff) * ((a >> 16) & 0xff) + ((y >> 16) & 0xff) * b; \ - r += (r >> 8) + 0x80; \ + r = ((x >> 16) & 0xff) * ((a >> 16) & 0xff) + ((y >> 16) & 0xff) * b + 0x80; \ + r += (r >> 8); \ r >>= 8; \ \ - x = (x & 0xff) * (a & 0xff) + (y & 0xff) * b; \ - x += (x >> 8) + 0x80; \ + x = (x & 0xff) * (a & 0xff) + (y & 0xff) * b + 0x80; \ + x += (x >> 8); \ x >>= 8; \ x |= r << 16; \ x |= 0x1000100 - ((x >> 8) & 0xff00ff); \ @@ -310,7 +314,7 @@ x = r; \ } while (0) -#define div_255(x) (((x) + ((x) >> 8) + 0x80) >> 8) +#define div_255(x) (((x) + 0x80 + (((x) + 0x80) >> 8)) >> 8) #if defined(__i386__) && defined(__GNUC__) #define FASTCALL __attribute__((regparm(3))) |