aboutsummaryrefslogtreecommitdiff
path: root/xorg-server/miext/shadow/shiplan2p8.c
blob: 17d6a132e90a282be474ae684bb68f032a8fd8d7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/*
 *  Copyright © 2013 Geert Uytterhoeven
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a
 *  copy of this software and associated documentation files (the "Software"),
 *  to deal in the Software without restriction, including without limitation
 *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
 *  and/or sell copies of the Software, and to permit persons to whom the
 *  Software is furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice (including the next
 *  paragraph) shall be included in all copies or substantial portions of the
 *  Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 *  DEALINGS IN THE SOFTWARE.
 *
 *  Based on shpacked.c, which is Copyright © 2000 Keith Packard
 */

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include <stdlib.h>

#include    <X11/X.h>
#include    "scrnintstr.h"
#include    "windowstr.h"
#include    <X11/fonts/font.h>
#include    "dixfontstr.h"
#include    <X11/fonts/fontstruct.h>
#include    "mi.h"
#include    "regionstr.h"
#include    "globals.h"
#include    "gcstruct.h"
#include    "shadow.h"
#include    "fb.h"
#include    "c2p_core.h"


    /*
     *  Perform a full C2P step on 16 8-bit pixels, stored in 4 32-bit words
     *  containing
     *    - 16 8-bit chunky pixels on input
     *    - permutated planar data (2 planes per 32-bit word) on output
     */

static void c2p_16x8(CARD32 d[4])
{
    transp4(d, 8, 2);
    transp4(d, 1, 2);
    transp4x(d, 16, 2);
    transp4x(d, 2, 2);
    transp4(d, 4, 1);
}


    /*
     *  Store a full block of permutated iplan2p8 data after c2p conversion
     */

static inline void store_iplan2p8(void *dst, const CARD32 d[4])
{
    CARD32 *p = dst;

    *p++ = d[1];
    *p++ = d[3];
    *p++ = d[0];
    *p++ = d[2];
}


void
shadowUpdateIplan2p8(ScreenPtr pScreen, shadowBufPtr pBuf)
{
    RegionPtr damage = shadowDamage(pBuf);
    PixmapPtr pShadow = pBuf->pPixmap;
    int nbox = RegionNumRects(damage);
    BoxPtr pbox = RegionRects(damage);
    FbBits *shaBase;
    CARD16 *shaLine, *sha;
    FbStride shaStride;
    int scrLine;
    _X_UNUSED int shaBpp, shaXoff, shaYoff;
    int x, y, w, h;
    int i, n;
    CARD16 *win;
    _X_UNUSED CARD32 winSize;
    union {
        CARD8 bytes[16];
        CARD32 words[4];
    } d;

    fbGetDrawable(&pShadow->drawable, shaBase, shaStride, shaBpp, shaXoff,
                  shaYoff);
    shaStride *= sizeof(FbBits) / sizeof(CARD16);

    while (nbox--) {
        x = pbox->x1;
        y = pbox->y1;
        w = pbox->x2 - pbox->x1;
        h = pbox->y2 - pbox->y1;

        scrLine = x & -16;
        shaLine = (CARD16 *)shaBase + y * shaStride + scrLine / sizeof(CARD16);

        n = ((x & 15) + w + 15) / 16;   /* number of c2p units in scanline */

        while (h--) {
            sha = shaLine;
            win = (CARD16 *) (*pBuf->window) (pScreen,
                                              y,
                                              scrLine,
                                              SHADOW_WINDOW_WRITE,
                                              &winSize,
                                              pBuf->closure);
            if (!win)
                return;
            for (i = 0; i < n; i++) {
                memcpy(d.bytes, sha, sizeof(d.bytes));
                c2p_16x8(d.words);
                store_iplan2p8(win, d.words);
                sha += sizeof(d.bytes) / sizeof(*sha);
                win += sizeof(d.bytes) / sizeof(*win);
            }
            shaLine += shaStride;
            y++;
        }
        pbox++;
    }
}