litmus-rt.git - The LITMUS^RT kernel.

The LITMUS^RT kernel.

Bjoern Brandenburg

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path: root/Documentation/i2c/functionality

	Commit message (Expand)	Author	Age
*	i2c: Spelling s/than/that/	Geert Uytterhoeven	2014-03-12
*	i2c: Split I2C_M_NOSTART support out of I2C_FUNC_PROTOCOL_MANGLING	Mark Brown	2012-05-30
*	i2c: Improve the functionality documentation	Jean Delvare	2008-05-11
*	[PATCH] i2c: Fix I2C_FUNC_PROTOCOL_MANGLING documentation	Hideki Iwamoto	2005-10-28
*	[PATCH] I2C: fix typo in documentation	Jean Delvare	2005-09-05
*	Linux-2.6.12-rc2v2.6.12-rc2	Linus Torvalds	2005-04-16

an> transp4(d, 8, 2); transp4(d, 1, 2); transp4x(d, 16, 2); transp4x(d, 2, 2); transp4(d, 4, 1); } /* * Array containing the permutation indices of the planar data after c2p */ static const int perm_c2p_16x8[4] = { 1, 3, 0, 2 }; /* * Store a full block of iplan2 data after c2p conversion */ static inline void store_iplan2(void *dst, u32 bpp, u32 d[4]) { int i; for (i = 0; i < bpp/2; i++, dst += 4) put_unaligned_be32(d[perm_c2p_16x8[i]], dst); } /* * Store a partial block of iplan2 data after c2p conversion */ static inline void store_iplan2_masked(void *dst, u32 bpp, u32 d[4], u32 mask) { int i; for (i = 0; i < bpp/2; i++, dst += 4) put_unaligned_be32(comp(d[perm_c2p_16x8[i]], get_unaligned_be32(dst), mask), dst); } /* * c2p_iplan2 - Copy 8-bit chunky image data to an interleaved planar * frame buffer with 2 bytes of interleave * @dst: Starting address of the planar frame buffer * @dx: Horizontal destination offset (in pixels) * @dy: Vertical destination offset (in pixels) * @width: Image width (in pixels) * @height: Image height (in pixels) * @dst_nextline: Frame buffer offset to the next line (in bytes) * @src_nextline: Image offset to the next line (in bytes) * @bpp: Bits per pixel of the planar frame buffer (2, 4, or 8) */ void c2p_iplan2(void *dst, const void *src, u32 dx, u32 dy, u32 width, u32 height, u32 dst_nextline, u32 src_nextline, u32 bpp) { union { u8 pixels[16]; u32 words[4]; } d; u32 dst_idx, first, last, w; const u8 *c; void *p; dst += dy*dst_nextline+(dx & ~15)*bpp; dst_idx = dx % 16; first = 0xffffU >> dst_idx; first |= first << 16; last = 0xffffU ^ (0xffffU >> ((dst_idx+width) % 16)); last |= last << 16; while (height--) { c = src; p = dst; w = width; if (dst_idx+width <= 16) { /* Single destination word */ first &= last; memset(d.pixels, 0, sizeof(d)); memcpy(d.pixels+dst_idx, c, width); c += width; c2p_16x8(d.words); store_iplan2_masked(p, bpp, d.words, first); p += bpp*2; } else { /* Multiple destination words */ w = width; /* Leading bits */ if (dst_idx) { w = 16 - dst_idx; memset(d.pixels, 0, dst_idx); memcpy(d.pixels+dst_idx, c, w); c += w; c2p_16x8(d.words); store_iplan2_masked(p, bpp, d.words, first); p += bpp*2; w = width-w; } /* Main chunk */ while (w >= 16) { memcpy(d.pixels, c, 16); c += 16; c2p_16x8(d.words); store_iplan2(p, bpp, d.words); p += bpp*2; w -= 16; } /* Trailing bits */ w %= 16; if (w > 0) { memcpy(d.pixels, c, w); memset(d.pixels+w, 0, 16-w); c2p_16x8(d.words); store_iplan2_masked(p, bpp, d.words, last); } } src += src_nextline; dst += dst_nextline; } } EXPORT_SYMBOL_GPL(c2p_iplan2); MODULE_LICENSE("GPL");