2 * Fast C2P (Chunky-to-Planar) Conversion
4 * Copyright (C) 2003-2008 Geert Uytterhoeven
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive
11 #include <linux/module.h>
12 #include <linux/string.h>
14 #include <asm/unaligned.h>
21 * Perform a full C2P step on 32 8-bit pixels, stored in 8 32-bit words
23 * - 32 8-bit chunky pixels on input
24 * - permutated planar data (1 plane per 32-bit word) on output
27 static void c2p_32x8(u32 d[8])
38 * Array containing the permutation indices of the planar data after c2p
41 static const int perm_c2p_32x8[8] = { 7, 5, 3, 1, 6, 4, 2, 0 };
45 * Store a full block of planar data after c2p conversion
48 static inline void store_planar(void *dst, u32 dst_inc, u32 bpp, u32 d[8])
52 for (i = 0; i < bpp; i++, dst += dst_inc)
53 put_unaligned_be32(d[perm_c2p_32x8[i]], dst);
58 * Store a partial block of planar data after c2p conversion
61 static inline void store_planar_masked(void *dst, u32 dst_inc, u32 bpp,
66 for (i = 0; i < bpp; i++, dst += dst_inc)
67 put_unaligned_be32(comp(d[perm_c2p_32x8[i]],
68 get_unaligned_be32(dst), mask),
74 * c2p_planar - Copy 8-bit chunky image data to a planar frame buffer
75 * @dst: Starting address of the planar frame buffer
76 * @dx: Horizontal destination offset (in pixels)
77 * @dy: Vertical destination offset (in pixels)
78 * @width: Image width (in pixels)
79 * @height: Image height (in pixels)
80 * @dst_nextline: Frame buffer offset to the next line (in bytes)
81 * @dst_nextplane: Frame buffer offset to the next plane (in bytes)
82 * @src_nextline: Image offset to the next line (in bytes)
83 * @bpp: Bits per pixel of the planar frame buffer (1-8)
86 void c2p_planar(void *dst, const void *src, u32 dx, u32 dy, u32 width,
87 u32 height, u32 dst_nextline, u32 dst_nextplane,
88 u32 src_nextline, u32 bpp)
94 u32 dst_idx, first, last, w;
98 dst += dy*dst_nextline+(dx & ~31);
100 first = 0xffffffffU >> dst_idx;
101 last = ~(0xffffffffU >> ((dst_idx+width) % 32));
106 if (dst_idx+width <= 32) {
107 /* Single destination word */
109 memset(d.pixels, 0, sizeof(d));
110 memcpy(d.pixels+dst_idx, c, width);
113 store_planar_masked(p, dst_nextplane, bpp, d.words,
117 /* Multiple destination words */
122 memset(d.pixels, 0, dst_idx);
123 memcpy(d.pixels+dst_idx, c, w);
126 store_planar_masked(p, dst_nextplane, bpp,
133 memcpy(d.pixels, c, 32);
136 store_planar(p, dst_nextplane, bpp, d.words);
143 memcpy(d.pixels, c, w);
144 memset(d.pixels+w, 0, 32-w);
146 store_planar_masked(p, dst_nextplane, bpp,
154 EXPORT_SYMBOL_GPL(c2p_planar);
156 MODULE_LICENSE("GPL");