diff options
Diffstat (limited to 'drivers/video/c2p.c')
| -rw-r--r-- | drivers/video/c2p.c | 181 |
1 files changed, 96 insertions, 85 deletions
diff --git a/drivers/video/c2p.c b/drivers/video/c2p.c index f102b578ce1..c170fff0d35 100644 --- a/drivers/video/c2p.c +++ b/drivers/video/c2p.c @@ -1,7 +1,7 @@ /* * Fast C2P (Chunky-to-Planar) Conversion * - * Copyright (C) 2003 Geert Uytterhoeven + * Copyright (C) 2003-2008 Geert Uytterhoeven * * NOTES: * - This code was inspired by Scout's C2P tutorial @@ -14,6 +14,9 @@ #include <linux/module.h> #include <linux/string.h> + +#include <asm/unaligned.h> + #include "c2p.h" @@ -21,97 +24,100 @@ * Basic transpose step */ -#define _transp(d, i1, i2, shift, mask) \ - do { \ - u32 t = (d[i1] ^ (d[i2] >> shift)) & mask; \ - d[i1] ^= t; \ - d[i2] ^= t << shift; \ - } while (0) +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; +} -static inline u32 get_mask(int n) +extern void c2p_unsupported(void); + +static inline u32 get_mask(unsigned int n) { switch (n) { case 1: return 0x55555555; - break; case 2: return 0x33333333; - break; case 4: return 0x0f0f0f0f; - break; case 8: return 0x00ff00ff; - break; case 16: return 0x0000ffff; - break; } + + c2p_unsupported(); return 0; } -#define transp_nx1(d, n) \ - do { \ - u32 mask = get_mask(n); \ - /* First block */ \ - _transp(d, 0, 1, n, mask); \ - /* Second block */ \ - _transp(d, 2, 3, n, mask); \ - /* Third block */ \ - _transp(d, 4, 5, n, mask); \ - /* Fourth block */ \ - _transp(d, 6, 7, n, mask); \ - } while (0) - -#define transp_nx2(d, n) \ - do { \ - u32 mask = get_mask(n); \ - /* First block */ \ - _transp(d, 0, 2, n, mask); \ - _transp(d, 1, 3, n, mask); \ - /* Second block */ \ - _transp(d, 4, 6, n, mask); \ - _transp(d, 5, 7, n, mask); \ - } while (0) - -#define transp_nx4(d, n) \ - do { \ - u32 mask = get_mask(n); \ - _transp(d, 0, 4, n, mask); \ - _transp(d, 1, 5, n, mask); \ - _transp(d, 2, 6, n, mask); \ - _transp(d, 3, 7, n, mask); \ - } while (0) - -#define transp(d, n, m) transp_nx ## m(d, n) +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(); +} /* * Perform a full C2P step on 32 8-bit pixels, stored in 8 32-bit words * containing * - 32 8-bit chunky pixels on input - * - permuted planar data on output + * - permutated planar data (1 plane per 32-bit word) on output */ -static void c2p_8bpp(u32 d[8]) +static void c2p_32x8(u32 d[8]) { - transp(d, 16, 4); - transp(d, 8, 2); - transp(d, 4, 1); - transp(d, 2, 4); - transp(d, 1, 2); + transp8(d, 16, 4); + transp8(d, 8, 2); + transp8(d, 4, 1); + transp8(d, 2, 4); + transp8(d, 1, 2); } /* - * Array containing the permution indices of the planar data after c2p + * Array containing the permutation indices of the planar data after c2p */ -static const int perm_c2p_8bpp[8] = { 7, 5, 3, 1, 6, 4, 2, 0 }; +static const int perm_c2p_32x8[8] = { 7, 5, 3, 1, 6, 4, 2, 0 }; /* @@ -119,8 +125,7 @@ static const int perm_c2p_8bpp[8] = { 7, 5, 3, 1, 6, 4, 2, 0 }; * This is equivalent to (a & mask) | (b & ~mask) */ -static inline unsigned long comp(unsigned long a, unsigned long b, - unsigned long mask) +static inline u32 comp(u32 a, u32 b, u32 mask) { return ((a ^ b) & mask) ^ b; } @@ -130,12 +135,12 @@ static inline unsigned long comp(unsigned long a, unsigned long b, * Store a full block of planar data after c2p conversion */ -static inline void store_planar(char *dst, u32 dst_inc, u32 bpp, u32 d[8]) +static inline void store_planar(void *dst, u32 dst_inc, u32 bpp, u32 d[8]) { int i; for (i = 0; i < bpp; i++, dst += dst_inc) - *(u32 *)dst = d[perm_c2p_8bpp[i]]; + put_unaligned_be32(d[perm_c2p_32x8[i]], dst); } @@ -143,13 +148,15 @@ static inline void store_planar(char *dst, u32 dst_inc, u32 bpp, u32 d[8]) * Store a partial block of planar data after c2p conversion */ -static inline void store_planar_masked(char *dst, u32 dst_inc, u32 bpp, +static inline void store_planar_masked(void *dst, u32 dst_inc, u32 bpp, u32 d[8], u32 mask) { int i; for (i = 0; i < bpp; i++, dst += dst_inc) - *(u32 *)dst = comp(d[perm_c2p_8bpp[i]], *(u32 *)dst, mask); + put_unaligned_be32(comp(d[perm_c2p_32x8[i]], + get_unaligned_be32(dst), mask), + dst); } @@ -166,18 +173,21 @@ static inline void store_planar_masked(char *dst, u32 dst_inc, u32 bpp, * @bpp: Bits per pixel of the planar frame buffer (1-8) */ -void c2p(u8 *dst, const u8 *src, u32 dx, u32 dy, u32 width, u32 height, +void c2p(void *dst, const void *src, u32 dx, u32 dy, u32 width, u32 height, u32 dst_nextline, u32 dst_nextplane, u32 src_nextline, u32 bpp) { - int dst_idx; - u32 d[8], first, last, w; + union { + u8 pixels[32]; + u32 words[8]; + } d; + u32 dst_idx, first, last, w; const u8 *c; - u8 *p; + void *p; dst += dy*dst_nextline+(dx & ~31); dst_idx = dx % 32; - first = ~0UL >> dst_idx; - last = ~(~0UL >> ((dst_idx+width) % 32)); + first = 0xffffffffU >> dst_idx; + last = ~(0xffffffffU >> ((dst_idx+width) % 32)); while (height--) { c = src; p = dst; @@ -185,11 +195,12 @@ void c2p(u8 *dst, const u8 *src, u32 dx, u32 dy, u32 width, u32 height, if (dst_idx+width <= 32) { /* Single destination word */ first &= last; - memset(d, 0, sizeof(d)); - memcpy((u8 *)d+dst_idx, c, width); + memset(d.pixels, 0, sizeof(d)); + memcpy(d.pixels+dst_idx, c, width); c += width; - c2p_8bpp(d); - store_planar_masked(p, dst_nextplane, bpp, d, first); + c2p_32x8(d.words); + store_planar_masked(p, dst_nextplane, bpp, d.words, + first); p += 4; } else { /* Multiple destination words */ @@ -197,32 +208,32 @@ void c2p(u8 *dst, const u8 *src, u32 dx, u32 dy, u32 width, u32 height, /* Leading bits */ if (dst_idx) { w = 32 - dst_idx; - memset(d, 0, dst_idx); - memcpy((u8 *)d+dst_idx, c, w); + memset(d.pixels, 0, dst_idx); + memcpy(d.pixels+dst_idx, c, w); c += w; - c2p_8bpp(d); - store_planar_masked(p, dst_nextplane, bpp, d, - first); + c2p_32x8(d.words); + store_planar_masked(p, dst_nextplane, bpp, + d.words, first); p += 4; w = width-w; } /* Main chunk */ while (w >= 32) { - memcpy(d, c, 32); + memcpy(d.pixels, c, 32); c += 32; - c2p_8bpp(d); - store_planar(p, dst_nextplane, bpp, d); + c2p_32x8(d.words); + store_planar(p, dst_nextplane, bpp, d.words); p += 4; w -= 32; } /* Trailing bits */ w %= 32; if (w > 0) { - memcpy(d, c, w); - memset((u8 *)d+w, 0, 32-w); - c2p_8bpp(d); - store_planar_masked(p, dst_nextplane, bpp, d, - last); + memcpy(d.pixels, c, w); + memset(d.pixels+w, 0, 32-w); + c2p_32x8(d.words); + store_planar_masked(p, dst_nextplane, bpp, + d.words, last); } } src += src_nextline; |