diff options
Diffstat (limited to 'xorg-server/miext/shadow/c2p_core.h')
| -rw-r--r-- | xorg-server/miext/shadow/c2p_core.h | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/xorg-server/miext/shadow/c2p_core.h b/xorg-server/miext/shadow/c2p_core.h new file mode 100644 index 000000000..5b9ea066c --- /dev/null +++ b/xorg-server/miext/shadow/c2p_core.h @@ -0,0 +1,187 @@ +/* + * Fast C2P (Chunky-to-Planar) Conversion + * + * NOTES: + * - This code was inspired by Scout's C2P tutorial + * - It assumes to run on a big endian system + * + * Copyright © 2003-2008 Geert Uytterhoeven + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + + + /* + * Basic transpose step + */ + +static inline void _transp(CARD32 d[], unsigned int i1, unsigned int i2, + unsigned int shift, CARD32 mask) +{ + CARD32 t = (d[i1] ^ (d[i2] >> shift)) & mask; + + d[i1] ^= t; + d[i2] ^= t << shift; +} + + +static inline void c2p_unsupported(void) { + BUG_WARN(1); +} + +static inline CARD32 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(CARD32 d[], unsigned int n, unsigned int m) +{ + CARD32 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(); +} + + + /* + * Transpose operations on 4 32-bit words + */ + +static inline void transp4(CARD32 d[], unsigned int n, unsigned int m) +{ + CARD32 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); + return; + + case 2: + /* Single n x 2 block */ + _transp(d, 0, 2, n, mask); + _transp(d, 1, 3, n, mask); + return; + } + + c2p_unsupported(); +} + + + /* + * Transpose operations on 4 32-bit words (reverse order) + */ + +static inline void transp4x(CARD32 d[], unsigned int n, unsigned int m) +{ + CARD32 mask = get_mask(n); + + switch (m) { + case 2: + /* Single n x 2 block */ + _transp(d, 2, 0, n, mask); + _transp(d, 3, 1, n, mask); + return; + } + + c2p_unsupported(); +} + + + /* + * Transpose operations on 2 32-bit words + */ + +static inline void transp2(CARD32 d[], unsigned int n) +{ + CARD32 mask = get_mask(n); + + /* Single n x 1 block */ + _transp(d, 0, 1, n, mask); + return; +} + + + /* + * Transpose operations on 2 32-bit words (reverse order) + */ + +static inline void transp2x(CARD32 d[], unsigned int n) +{ + CARD32 mask = get_mask(n); + + /* Single n x 1 block */ + _transp(d, 1, 0, n, mask); + return; +} |