1/*
2 *
3 * Copyright © 2000 Keith Packard
4 *
5 * Permission to use, copy, modify, distribute, and sell this software and its
6 * documentation for any purpose is hereby granted without fee, provided that
7 * the above copyright notice appear in all copies and that both that
8 * copyright notice and this permission notice appear in supporting
9 * documentation, and that the name of Keith Packard not be used in
10 * advertising or publicity pertaining to distribution of the software without
11 * specific, written prior permission.  Keith Packard makes no
12 * representations about the suitability of this software for any purpose.  It
13 * is provided "as is" without express or implied warranty.
14 *
15 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
16 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
17 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
18 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
19 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
20 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
21 * PERFORMANCE OF THIS SOFTWARE.
22 */
23
24#ifdef HAVE_DIX_CONFIG_H
25#include <dix-config.h>
26#endif
27
28#include <stdlib.h>
29
30#include    <X11/X.h>
31#include    "scrnintstr.h"
32#include    "windowstr.h"
33#include    <X11/fonts/font.h>
34#include    "dixfontstr.h"
35#include    <X11/fonts/fontstruct.h>
36#include    "mi.h"
37#include    "regionstr.h"
38#include    "globals.h"
39#include    "gcstruct.h"
40#include    "shadow.h"
41#include    "fb.h"
42
43/*
44 * 32 4-bit pixels per write
45 */
46
47#define PL_SHIFT    7
48#define PL_UNIT	    (1 << PL_SHIFT)
49#define PL_MASK	    (PL_UNIT - 1)
50
51/*
52 *  32->8 conversion:
53 *
54 *      7 6 5 4 3 2 1 0
55 *      A B C D E F G H
56 *
57 *      3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
58 *      1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
59 * m    . . . H . . . G . . . F . . . E . . . D . . . C . . . B . . . A
60 * m1   G . . . F . . . E . . . D . . . C . . . B . . . A . . . . . . .	    m << (7 - (p))
61 * m2   . H . . . G . . . F . . . E . . . D . . . C . . . B . . . A . .	    (m >> (p)) << 2
62 * m3   G               E               C               A                   m1 & 0x80808080
63 * m4     H               F               D               B                 m2 & 0x40404040
64 * m5   G H             E F             C D             A B                 m3 | m4
65 * m6   G H             E F             C D     G H     A B     E F         m5 | (m5 >> 20)
66 * m7   G H             E F             C D     G H     A B C D E F G H     m6 | (m6 >> 10)
67 */
68
69#if 0
70#define GetBits(p,o,d) {\
71    m = sha[o]; \
72    m1 = m << (7 - (p)); \
73    m2 = (m >> (p)) << 2; \
74    m3 = m1 & 0x80808080; \
75    m4 = m2 & 0x40404040; \
76    m5 = m3 | m4; \
77    m6 = m5 | (m5 >> 20); \
78    d = m6 | (m6 >> 10); \
79}
80#else
81#define GetBits(p,o,d) {\
82    m = sha[o]; \
83    m5 = ((m << (7 - (p))) & 0x80808080) | (((m >> (p)) << 2) & 0x40404040); \
84    m6 = m5 | (m5 >> 20); \
85    d = m6 | (m6 >> 10); \
86}
87#endif
88
89void
90shadowUpdatePlanar4 (ScreenPtr	    pScreen,
91		     shadowBufPtr   pBuf)
92{
93    RegionPtr	damage = shadowDamage (pBuf);
94    PixmapPtr	pShadow = pBuf->pPixmap;
95    int		nbox = RegionNumRects (damage);
96    BoxPtr	pbox = RegionRects (damage);
97    CARD32	*shaBase, *shaLine, *sha;
98    FbStride	shaStride;
99    int		scrBase, scrLine, scr;
100    int		shaBpp;
101    int		shaXoff, shaYoff;   /* XXX assumed to be zero */
102    int		x, y, w, h, width;
103    int         i;
104    CARD32	*winBase = NULL, *win;
105    CARD32	winSize;
106    int		plane;
107    CARD32	m,m5,m6;
108    CARD8	s1, s2, s3, s4;
109
110    fbGetStipDrawable (&pShadow->drawable, shaBase, shaStride, shaBpp, shaXoff, shaYoff);
111    while (nbox--)
112    {
113	x = (pbox->x1) * shaBpp;
114	y = (pbox->y1);
115	w = (pbox->x2 - pbox->x1) * shaBpp;
116	h = pbox->y2 - pbox->y1;
117
118	w = (w + (x & PL_MASK) + PL_MASK) >> PL_SHIFT;
119	x &= ~PL_MASK;
120
121	scrLine = (x >> PL_SHIFT);
122	shaLine = shaBase + y * shaStride + (x >> FB_SHIFT);
123
124	while (h--)
125	{
126	    for (plane = 0; plane < 4; plane++)
127	    {
128		width = w;
129		scr = scrLine;
130		sha = shaLine;
131		winSize = 0;
132		scrBase = 0;
133		while (width) {
134		    /* how much remains in this window */
135		    i = scrBase + winSize - scr;
136		    if (i <= 0 || scr < scrBase)
137		    {
138			winBase = (CARD32 *) (*pBuf->window) (pScreen,
139							      y,
140							      (scr << 4) | (plane),
141							      SHADOW_WINDOW_WRITE,
142							      &winSize,
143							      pBuf->closure);
144			if(!winBase)
145			return;
146			winSize >>= 2;
147			scrBase = scr;
148			i = winSize;
149		    }
150		    win = winBase + (scr - scrBase);
151		    if (i > width)
152		    i = width;
153		    width -= i;
154		    scr += i;
155
156		    while (i--)
157		    {
158			GetBits(plane,0,s1);
159			GetBits(plane,1,s2);
160			GetBits(plane,2,s3);
161			GetBits(plane,3,s4);
162			*win++ = s1 | (s2 << 8) | (s3 << 16) | (s4 << 24);
163			sha += 4;
164		    }
165		}
166	    }
167	    shaLine += shaStride;
168	    y++;
169	}
170	pbox++;
171    }
172}
173
174shadowUpdateProc shadowUpdatePlanar4Weak(void) {
175    return shadowUpdatePlanar4;
176}
177
178shadowUpdateProc shadowUpdatePlanar4x8Weak(void) {
179    return shadowUpdatePlanar4x8;
180}
181