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fbdev: c2p - Extract common c2p core to c2p_core.h 

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Geert Uytterhoeven 2009-01-04 11:58:20 +01:00
parent 1f034456c1
commit 2cd1de0a0f
2 changed files with 107 additions and 91 deletions
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92
drivers/video/c2p.c
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@ -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"
/*
@ -120,17 +41,6 @@ static void c2p_32x8(u32 d[8])
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
*/

106
drivers/video/c2p_core.h Normal file
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@ -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;
}