diff options
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/c2p.c | 92 | ||||
| -rw-r--r-- | drivers/video/c2p_core.h | 106 |
2 files changed, 107 insertions, 91 deletions
diff --git a/drivers/video/c2p.c b/drivers/video/c2p.c index c170fff..1238c8b 100644 --- a/drivers/video/c2p.c +++ b/drivers/video/c2p.c @@ -3,10 +3,6 @@ * * Copyright (C) 2003-2008 Geert Uytterhoeven * - * NOTES: - * - This code was inspired by Scout's C2P tutorial - * - It assumes to run on a big endian system - * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. @@ -18,82 +14,7 @@ #include <asm/unaligned.h> #include "c2p.h" - - - /* - * Basic transpose step - */ - -static inline void _transp(u32 d[], unsigned int i1, unsigned int i2, - unsigned int shift, u32 mask) -{ - u32 t = (d[i1] ^ (d[i2] >> shift)) & mask; - - d[i1] ^= t; - d[i2] ^= t << shift; -} - -extern void c2p_unsupported(void); - -static inline u32 get_mask(unsigned int n) -{ - switch (n) { - case 1: - return 0x55555555; - - case 2: - return 0x33333333; - - case 4: - return 0x0f0f0f0f; - - case 8: - return 0x00ff00ff; - - case 16: - return 0x0000ffff; - } - - c2p_unsupported(); - return 0; -} - -static inline void transp8(u32 d[], unsigned int n, unsigned int m) -{ - u32 mask = get_mask(n); - - switch (m) { - case 1: - /* First n x 1 block */ - _transp(d, 0, 1, n, mask); - /* Second n x 1 block */ - _transp(d, 2, 3, n, mask); - /* Third n x 1 block */ - _transp(d, 4, 5, n, mask); - /* Fourth n x 1 block */ - _transp(d, 6, 7, n, mask); - return; - - case 2: - /* First n x 2 block */ - _transp(d, 0, 2, n, mask); - _transp(d, 1, 3, n, mask); - /* Second n x 2 block */ - _transp(d, 4, 6, n, mask); - _transp(d, 5, 7, n, mask); - return; - - case 4: - /* Single n x 4 block */ - _transp(d, 0, 4, n, mask); - _transp(d, 1, 5, n, mask); - _transp(d, 2, 6, n, mask); - _transp(d, 3, 7, n, mask); - return; - } - - c2p_unsupported(); -} +#include "c2p_core.h" /* @@ -121,17 +42,6 @@ static const int perm_c2p_32x8[8] = { 7, 5, 3, 1, 6, 4, 2, 0 }; /* - * Compose two values, using a bitmask as decision value - * This is equivalent to (a & mask) | (b & ~mask) - */ - -static inline u32 comp(u32 a, u32 b, u32 mask) -{ - return ((a ^ b) & mask) ^ b; -} - - - /* * Store a full block of planar data after c2p conversion */ diff --git a/drivers/video/c2p_core.h b/drivers/video/c2p_core.h new file mode 100644 index 0000000..3573cf7 --- /dev/null +++ b/drivers/video/c2p_core.h @@ -0,0 +1,106 @@ +/* + * Fast C2P (Chunky-to-Planar) Conversion + * + * Copyright (C) 2003-2008 Geert Uytterhoeven + * + * NOTES: + * - This code was inspired by Scout's C2P tutorial + * - It assumes to run on a big endian system + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + + + /* + * Basic transpose step + */ + +static inline void _transp(u32 d[], unsigned int i1, unsigned int i2, + unsigned int shift, u32 mask) +{ + u32 t = (d[i1] ^ (d[i2] >> shift)) & mask; + + d[i1] ^= t; + d[i2] ^= t << shift; +} + + +extern void c2p_unsupported(void); + +static inline u32 get_mask(unsigned int n) +{ + switch (n) { + case 1: + return 0x55555555; + + case 2: + return 0x33333333; + + case 4: + return 0x0f0f0f0f; + + case 8: + return 0x00ff00ff; + + case 16: + return 0x0000ffff; + } + + c2p_unsupported(); + return 0; +} + + + /* + * Transpose operations on 8 32-bit words + */ + +static inline void transp8(u32 d[], unsigned int n, unsigned int m) +{ + u32 mask = get_mask(n); + + switch (m) { + case 1: + /* First n x 1 block */ + _transp(d, 0, 1, n, mask); + /* Second n x 1 block */ + _transp(d, 2, 3, n, mask); + /* Third n x 1 block */ + _transp(d, 4, 5, n, mask); + /* Fourth n x 1 block */ + _transp(d, 6, 7, n, mask); + return; + + case 2: + /* First n x 2 block */ + _transp(d, 0, 2, n, mask); + _transp(d, 1, 3, n, mask); + /* Second n x 2 block */ + _transp(d, 4, 6, n, mask); + _transp(d, 5, 7, n, mask); + return; + + case 4: + /* Single n x 4 block */ + _transp(d, 0, 4, n, mask); + _transp(d, 1, 5, n, mask); + _transp(d, 2, 6, n, mask); + _transp(d, 3, 7, n, mask); + return; + } + + c2p_unsupported(); +} + + + /* + * Compose two values, using a bitmask as decision value + * This is equivalent to (a & mask) | (b & ~mask) + */ + +static inline u32 comp(u32 a, u32 b, u32 mask) +{ + return ((a ^ b) & mask) ^ b; +} |