video/fbdev/c2p_planar.c

2  *  Fast C2P (Chunky-to-Planar) Conversion
4  *  Copyright (C) 2003-2008 Geert Uytterhoeven
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
38      *  Array containing the permutation indices of the planar data after c2p
45      *  Store a full block of planar data after c2p conversion
58      *  Store a partial block of planar data after c2p conversion
74      *  c2p_planar - Copy 8-bit chunky image data to a planar frame buffer
78      *  @width: Image width (in pixels)
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,  in c2p_planar()  argument
101 	last = ~(0xffffffffU >> ((dst_idx+width) % 32));  in c2p_planar()
102 	while (height--) {  in c2p_planar()
105 		w = width;  in c2p_planar()
106 		if (dst_idx+width <= 32) {  in c2p_planar()
110 			memcpy(d.pixels+dst_idx, c, width);  in c2p_planar()
111 			c += width;  in c2p_planar()
118 			w = width;  in c2p_planar()
121 				w = 32 - dst_idx;  in c2p_planar()
129 				w = width-w;  in c2p_planar()
138 				w -= 32;  in c2p_planar()
144 				memset(d.pixels+w, 0, 32-w);  in c2p_planar()
156 MODULE_DESCRIPTION("Fast C2P (Chunky-to-Planar) Conversion");