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153 lines
3.5 KiB
153 lines
3.5 KiB
/* |
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* Fast C2P (Chunky-to-Planar) Conversion |
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* |
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* Copyright (C) 2003-2008 Geert Uytterhoeven |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file COPYING in the main directory of this archive |
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* for more details. |
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*/ |
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#include <linux/module.h> |
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#include <linux/string.h> |
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#include <asm/unaligned.h> |
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#include "c2p.h" |
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#include "c2p_core.h" |
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/* |
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* Perform a full C2P step on 16 8-bit pixels, stored in 4 32-bit words |
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* containing |
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* - 16 8-bit chunky pixels on input |
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* - permutated planar data (2 planes per 32-bit word) on output |
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*/ |
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static void c2p_16x8(u32 d[4]) |
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{ |
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transp4(d, 8, 2); |
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transp4(d, 1, 2); |
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transp4x(d, 16, 2); |
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transp4x(d, 2, 2); |
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transp4(d, 4, 1); |
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} |
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/* |
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* Array containing the permutation indices of the planar data after c2p |
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*/ |
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static const int perm_c2p_16x8[4] = { 1, 3, 0, 2 }; |
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/* |
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* Store a full block of iplan2 data after c2p conversion |
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*/ |
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static inline void store_iplan2(void *dst, u32 bpp, u32 d[4]) |
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{ |
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int i; |
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for (i = 0; i < bpp/2; i++, dst += 4) |
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put_unaligned_be32(d[perm_c2p_16x8[i]], dst); |
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} |
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/* |
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* Store a partial block of iplan2 data after c2p conversion |
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*/ |
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static inline void store_iplan2_masked(void *dst, u32 bpp, u32 d[4], u32 mask) |
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{ |
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int i; |
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for (i = 0; i < bpp/2; i++, dst += 4) |
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put_unaligned_be32(comp(d[perm_c2p_16x8[i]], |
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get_unaligned_be32(dst), mask), |
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dst); |
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} |
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/* |
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* c2p_iplan2 - Copy 8-bit chunky image data to an interleaved planar |
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* frame buffer with 2 bytes of interleave |
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* @dst: Starting address of the planar frame buffer |
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* @dx: Horizontal destination offset (in pixels) |
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* @dy: Vertical destination offset (in pixels) |
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* @width: Image width (in pixels) |
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* @height: Image height (in pixels) |
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* @dst_nextline: Frame buffer offset to the next line (in bytes) |
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* @src_nextline: Image offset to the next line (in bytes) |
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* @bpp: Bits per pixel of the planar frame buffer (2, 4, or 8) |
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*/ |
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void c2p_iplan2(void *dst, const void *src, u32 dx, u32 dy, u32 width, |
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u32 height, u32 dst_nextline, u32 src_nextline, u32 bpp) |
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{ |
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union { |
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u8 pixels[16]; |
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u32 words[4]; |
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} d; |
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u32 dst_idx, first, last, w; |
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const u8 *c; |
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void *p; |
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dst += dy*dst_nextline+(dx & ~15)*bpp; |
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dst_idx = dx % 16; |
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first = 0xffffU >> dst_idx; |
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first |= first << 16; |
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last = 0xffffU ^ (0xffffU >> ((dst_idx+width) % 16)); |
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last |= last << 16; |
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while (height--) { |
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c = src; |
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p = dst; |
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w = width; |
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if (dst_idx+width <= 16) { |
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/* Single destination word */ |
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first &= last; |
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memset(d.pixels, 0, sizeof(d)); |
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memcpy(d.pixels+dst_idx, c, width); |
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c += width; |
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c2p_16x8(d.words); |
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store_iplan2_masked(p, bpp, d.words, first); |
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p += bpp*2; |
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} else { |
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/* Multiple destination words */ |
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w = width; |
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/* Leading bits */ |
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if (dst_idx) { |
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w = 16 - dst_idx; |
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memset(d.pixels, 0, dst_idx); |
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memcpy(d.pixels+dst_idx, c, w); |
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c += w; |
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c2p_16x8(d.words); |
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store_iplan2_masked(p, bpp, d.words, first); |
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p += bpp*2; |
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w = width-w; |
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} |
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/* Main chunk */ |
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while (w >= 16) { |
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memcpy(d.pixels, c, 16); |
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c += 16; |
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c2p_16x8(d.words); |
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store_iplan2(p, bpp, d.words); |
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p += bpp*2; |
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w -= 16; |
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} |
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/* Trailing bits */ |
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w %= 16; |
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if (w > 0) { |
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memcpy(d.pixels, c, w); |
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memset(d.pixels+w, 0, 16-w); |
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c2p_16x8(d.words); |
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store_iplan2_masked(p, bpp, d.words, last); |
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} |
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} |
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src += src_nextline; |
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dst += dst_nextline; |
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} |
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} |
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EXPORT_SYMBOL_GPL(c2p_iplan2); |
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MODULE_LICENSE("GPL");
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