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 * Expose 8bpp depth 4
45 */
46
47/*
48 *  32->8 conversion:
49 *
50 *      7 6 5 4 3 2 1 0
51 *      A B C D E F G H
52 *
53 *      3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
54 *      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
55 * m1   D x x x x x x x C x x x x x x x B x x x x x x x A x x x x x x x     sha[0] << (7-(p))
56 * m2   x x x x H x x x x x x x G x x x x x x x F x x x x x x x E x x x     sha[1] << (3-(p))
57 * m3   D               C               B               A                   m1 & 0x80808080
58 * m4           H               G               F               E           m2 & 0x08080808
59 * m5   D       H       C       G       B       F       A       E	    m3 | m4
60 * m6                     D       H       C       G       B       F         m5 >> 9
61 * m7   D       H       C D     G H     B C     F G     A B     E F         m5 | m6
62 * m8                                       D       H       C D     G H     m7 >> 18
63 * m9   D       H       C D     G H     B C D   F G H   A B C D E F G H     m7 | m8
64 */
65
66#define PL_SHIFT    8
67#define PL_UNIT	    (1 << PL_SHIFT)
68#define PL_MASK	    (PL_UNIT - 1)
69
70#if 0
71#define GetBits(p,o,d) { \
72    CARD32	m1,m2,m3,m4,m5,m6,m7,m8; \
73    m1 = sha[o] << (7 - (p)); \
74    m2 = sha[(o)+1] << (3 - (p)); \
75    m3 = m1 & 0x80808080; \
76    m4 = m2 & 0x08080808; \
77    m5 = m3 | m4; \
78    m6 = m5 >> 9; \
79    m7 = m5 | m6; \
80    m8 = m7 >> 18; \
81    d = m7 | m8; \
82}
83#else
84#define GetBits(p,o,d) { \
85    CARD32	m5,m7; \
86    m5 = ((sha[o] << (7 - (p))) & 0x80808080) | ((sha[(o)+1] << (3 - (p))) & 0x08080808); \
87    m7 = m5 | (m5 >> 9); \
88    d = m7 | (m7 >> 18); \
89}
90#endif
91
92void
93shadowUpdatePlanar4x8(ScreenPtr pScreen, shadowBufPtr pBuf)
94{
95    RegionPtr damage = DamageRegion(pBuf->pDamage);
96    PixmapPtr pShadow = pBuf->pPixmap;
97    int nbox = RegionNumRects(damage);
98    BoxPtr pbox = RegionRects(damage);
99    CARD32 *shaBase, *shaLine, *sha;
100    CARD8 s1, s2, s3, s4;
101    FbStride shaStride;
102    int scrBase, scrLine, scr;
103    int shaBpp;
104    _X_UNUSED int shaXoff, shaYoff;
105    int x, y, w, h, width;
106    int i;
107    CARD32 *winBase = NULL, *win;
108    CARD32 winSize;
109    int plane;
110
111    fbGetStipDrawable(&pShadow->drawable, shaBase, shaStride, shaBpp, shaXoff,
112                      shaYoff);
113    while (nbox--) {
114        x = pbox->x1 * shaBpp;
115        y = pbox->y1;
116        w = (pbox->x2 - pbox->x1) * shaBpp;
117        h = pbox->y2 - pbox->y1;
118
119        w = (w + (x & PL_MASK) + PL_MASK) >> PL_SHIFT;
120        x &= ~PL_MASK;
121
122        scrLine = (x >> PL_SHIFT);
123        shaLine = shaBase + y * shaStride + (x >> FB_SHIFT);
124
125        while (h--) {
126            for (plane = 0; plane < 4; plane++) {
127                width = w;
128                scr = scrLine;
129                sha = shaLine;
130                winSize = 0;
131                scrBase = 0;
132                while (width) {
133                    /* how much remains in this window */
134                    i = scrBase + winSize - scr;
135                    if (i <= 0 || scr < scrBase) {
136                        winBase = (CARD32 *) (*pBuf->window) (pScreen,
137                                                              y,
138                                                              (scr << 4) |
139                                                              (plane),
140                                                              SHADOW_WINDOW_WRITE,
141                                                              &winSize,
142                                                              pBuf->closure);
143                        if (!winBase)
144                            return;
145                        winSize >>= 2;
146                        scrBase = scr;
147                        i = winSize;
148                    }
149                    win = winBase + (scr - scrBase);
150                    if (i > width)
151                        i = width;
152                    width -= i;
153                    scr += i;
154
155                    while (i--) {
156                        GetBits(plane, 0, s1);
157                        GetBits(plane, 2, s2);
158                        GetBits(plane, 4, s3);
159                        GetBits(plane, 6, s4);
160                        *win++ = s1 | (s2 << 8) | (s3 << 16) | (s4 << 24);
161                        sha += 8;
162                    }
163                }
164            }
165            shaLine += shaStride;
166            y++;
167        }
168        pbox++;
169    }
170}
171