xref: /xsrc/external/mit/xf86-video-intel/dist/src/sna/fb/fbutil.c

/*
 * Copyright © 1998 Keith Packard
 * Copyright © 2012 Intel Corporation
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#include "fb.h"

FbBits
fbReplicatePixel(Pixel p, int bpp)
{
	FbBits b = p;

	b &= FbFullMask(bpp);
	while (bpp < FB_UNIT) {
		b |= b << bpp;
		bpp <<= 1;
	}
	return b;
}

/*
 * Stipple masks are independent of bit/byte order as long
 * as bitorder == byteorder.  FB doesn't handle the case
 * where these differ
 */
#define __mask(x,w)	((FB_ALLONES << ((x) & FB_MASK)) & \
			 (FB_ALLONES >> ((FB_UNIT - ((x) + (w))) & FB_MASK)))
#define _mask(x,w)	__mask((x)*(w),(w))
#define mask(b,n,w)	((((b) >> (n)) & 1) * _mask(n,w))

#define _C1(b,n,w) mask(b,n,w)
#define _C2(b,n,w) (_C1(b,n,w) | _C1(b,n+1,w))
#define _C4(b,n,w) (_C2(b,n,w) | _C2(b,n+2,w))
#define C8(b,w) (_C4(b,0,w) | _C4(b,4,w))
#define C4(b,w) _C4(b,0,w)
#define C2(b,w) _C2(b,0,w)
#define C1(b,w) _C1(b,0,w)

static const FbBits fbStipple8Bits[256] = {
	C8(0, 4), C8(1, 4), C8(2, 4), C8(3, 4), C8(4, 4), C8(5, 4),
	C8(6, 4), C8(7, 4), C8(8, 4), C8(9, 4), C8(10, 4), C8(11, 4),
	C8(12, 4), C8(13, 4), C8(14, 4), C8(15, 4), C8(16, 4), C8(17, 4),
	C8(18, 4), C8(19, 4), C8(20, 4), C8(21, 4), C8(22, 4), C8(23, 4),
	C8(24, 4), C8(25, 4), C8(26, 4), C8(27, 4), C8(28, 4), C8(29, 4),
	C8(30, 4), C8(31, 4), C8(32, 4), C8(33, 4), C8(34, 4), C8(35, 4),
	C8(36, 4), C8(37, 4), C8(38, 4), C8(39, 4), C8(40, 4), C8(41, 4),
	C8(42, 4), C8(43, 4), C8(44, 4), C8(45, 4), C8(46, 4), C8(47, 4),
	C8(48, 4), C8(49, 4), C8(50, 4), C8(51, 4), C8(52, 4), C8(53, 4),
	C8(54, 4), C8(55, 4), C8(56, 4), C8(57, 4), C8(58, 4), C8(59, 4),
	C8(60, 4), C8(61, 4), C8(62, 4), C8(63, 4), C8(64, 4), C8(65, 4),
	C8(66, 4), C8(67, 4), C8(68, 4), C8(69, 4), C8(70, 4), C8(71, 4),
	C8(72, 4), C8(73, 4), C8(74, 4), C8(75, 4), C8(76, 4), C8(77, 4),
	C8(78, 4), C8(79, 4), C8(80, 4), C8(81, 4), C8(82, 4), C8(83, 4),
	C8(84, 4), C8(85, 4), C8(86, 4), C8(87, 4), C8(88, 4), C8(89, 4),
	C8(90, 4), C8(91, 4), C8(92, 4), C8(93, 4), C8(94, 4), C8(95, 4),
	C8(96, 4), C8(97, 4), C8(98, 4), C8(99, 4), C8(100, 4), C8(101, 4),
	C8(102, 4), C8(103, 4), C8(104, 4), C8(105, 4), C8(106, 4), C8(107, 4),
	C8(108, 4), C8(109, 4), C8(110, 4), C8(111, 4), C8(112, 4), C8(113, 4),
	C8(114, 4), C8(115, 4), C8(116, 4), C8(117, 4), C8(118, 4), C8(119, 4),
	C8(120, 4), C8(121, 4), C8(122, 4), C8(123, 4), C8(124, 4), C8(125, 4),
	C8(126, 4), C8(127, 4), C8(128, 4), C8(129, 4), C8(130, 4), C8(131, 4),
	C8(132, 4), C8(133, 4), C8(134, 4), C8(135, 4), C8(136, 4), C8(137, 4),
	C8(138, 4), C8(139, 4), C8(140, 4), C8(141, 4), C8(142, 4), C8(143, 4),
	C8(144, 4), C8(145, 4), C8(146, 4), C8(147, 4), C8(148, 4), C8(149, 4),
	C8(150, 4), C8(151, 4), C8(152, 4), C8(153, 4), C8(154, 4), C8(155, 4),
	C8(156, 4), C8(157, 4), C8(158, 4), C8(159, 4), C8(160, 4), C8(161, 4),
	C8(162, 4), C8(163, 4), C8(164, 4), C8(165, 4), C8(166, 4), C8(167, 4),
	C8(168, 4), C8(169, 4), C8(170, 4), C8(171, 4), C8(172, 4), C8(173, 4),
	C8(174, 4), C8(175, 4), C8(176, 4), C8(177, 4), C8(178, 4), C8(179, 4),
	C8(180, 4), C8(181, 4), C8(182, 4), C8(183, 4), C8(184, 4), C8(185, 4),
	C8(186, 4), C8(187, 4), C8(188, 4), C8(189, 4), C8(190, 4), C8(191, 4),
	C8(192, 4), C8(193, 4), C8(194, 4), C8(195, 4), C8(196, 4), C8(197, 4),
	C8(198, 4), C8(199, 4), C8(200, 4), C8(201, 4), C8(202, 4), C8(203, 4),
	C8(204, 4), C8(205, 4), C8(206, 4), C8(207, 4), C8(208, 4), C8(209, 4),
	C8(210, 4), C8(211, 4), C8(212, 4), C8(213, 4), C8(214, 4), C8(215, 4),
	C8(216, 4), C8(217, 4), C8(218, 4), C8(219, 4), C8(220, 4), C8(221, 4),
	C8(222, 4), C8(223, 4), C8(224, 4), C8(225, 4), C8(226, 4), C8(227, 4),
	C8(228, 4), C8(229, 4), C8(230, 4), C8(231, 4), C8(232, 4), C8(233, 4),
	C8(234, 4), C8(235, 4), C8(236, 4), C8(237, 4), C8(238, 4), C8(239, 4),
	C8(240, 4), C8(241, 4), C8(242, 4), C8(243, 4), C8(244, 4), C8(245, 4),
	C8(246, 4), C8(247, 4), C8(248, 4), C8(249, 4), C8(250, 4), C8(251, 4),
	C8(252, 4), C8(253, 4), C8(254, 4), C8(255, 4),
};

static const FbBits fbStipple4Bits[16] = {
	C4(0, 8), C4(1, 8), C4(2, 8), C4(3, 8), C4(4, 8), C4(5, 8),
	C4(6, 8), C4(7, 8), C4(8, 8), C4(9, 8), C4(10, 8), C4(11, 8),
	C4(12, 8), C4(13, 8), C4(14, 8), C4(15, 8),
};

static const FbBits fbStipple2Bits[4] = {
	C2(0, 16), C2(1, 16), C2(2, 16), C2(3, 16),
};

static const FbBits fbStipple1Bits[2] = {
	C1(0, 32), C1(1, 32),
};
const FbBits *const fbStippleTable[] = {
	0,
	fbStipple1Bits,
	fbStipple2Bits,
	0,
	fbStipple4Bits,
	0,
	0,
	0,
	fbStipple8Bits,
};