1/*
2 *  Copyright © 2013 Geert Uytterhoeven
3 *
4 *  Permission is hereby granted, free of charge, to any person obtaining a
5 *  copy of this software and associated documentation files (the "Software"),
6 *  to deal in the Software without restriction, including without limitation
7 *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 *  and/or sell copies of the Software, and to permit persons to whom the
9 *  Software is furnished to do so, subject to the following conditions:
10 *
11 *  The above copyright notice and this permission notice (including the next
12 *  paragraph) shall be included in all copies or substantial portions of the
13 *  Software.
14 *
15 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 *  DEALINGS IN THE SOFTWARE.
22 *
23 *  Based on shpacked.c, which is Copyright © 2000 Keith Packard
24 */
25
26#ifdef HAVE_DIX_CONFIG_H
27#include <dix-config.h>
28#endif
29
30#include <stdlib.h>
31
32#include    <X11/X.h>
33#include    "scrnintstr.h"
34#include    "windowstr.h"
35#include    <X11/fonts/font.h>
36#include    "dixfontstr.h"
37#include    <X11/fonts/fontstruct.h>
38#include    "mi.h"
39#include    "regionstr.h"
40#include    "globals.h"
41#include    "gcstruct.h"
42#include    "shadow.h"
43#include    "fb.h"
44#include    "c2p_core.h"
45
46
47    /*
48     *  Perform a full C2P step on 32 8-bit pixels, stored in 8 32-bit words
49     *  containing
50     *    - 32 8-bit chunky pixels on input
51     *    - permutated planar data (1 plane per 32-bit word) on output
52     */
53
54static void c2p_32x8(CARD32 d[8])
55{
56    transp8(d, 16, 4);
57    transp8(d, 8, 2);
58    transp8(d, 4, 1);
59    transp8(d, 2, 4);
60    transp8(d, 1, 2);
61}
62
63
64    /*
65     *  Store a full block of permutated planar data after c2p conversion
66     */
67
68static inline void store_afb8(void *dst, unsigned int stride,
69                              const CARD32 d[8])
70{
71    CARD8 *p = dst;
72
73    *(CARD32 *)p = d[7]; p += stride;
74    *(CARD32 *)p = d[5]; p += stride;
75    *(CARD32 *)p = d[3]; p += stride;
76    *(CARD32 *)p = d[1]; p += stride;
77    *(CARD32 *)p = d[6]; p += stride;
78    *(CARD32 *)p = d[4]; p += stride;
79    *(CARD32 *)p = d[2]; p += stride;
80    *(CARD32 *)p = d[0]; p += stride;
81}
82
83
84void
85shadowUpdateAfb8(ScreenPtr pScreen, shadowBufPtr pBuf)
86{
87    RegionPtr damage = DamageRegion(pBuf->pDamage);
88    PixmapPtr pShadow = pBuf->pPixmap;
89    int nbox = RegionNumRects(damage);
90    BoxPtr pbox = RegionRects(damage);
91    FbBits *shaBase;
92    CARD32 *shaLine, *sha;
93    FbStride shaStride;
94    int scrLine;
95    _X_UNUSED int shaBpp, shaXoff, shaYoff;
96    int x, y, w, h;
97    int i, n;
98    CARD32 *win;
99    CARD32 off, winStride;
100    union {
101        CARD8 bytes[32];
102        CARD32 words[8];
103    } d;
104
105    fbGetDrawable(&pShadow->drawable, shaBase, shaStride, shaBpp, shaXoff,
106                  shaYoff);
107    if (sizeof(FbBits) != sizeof(CARD32))
108        shaStride = shaStride * sizeof(FbBits) / sizeof(CARD32);
109
110    while (nbox--) {
111        x = pbox->x1;
112        y = pbox->y1;
113        w = pbox->x2 - pbox->x1;
114        h = pbox->y2 - pbox->y1;
115
116        scrLine = x & -32;
117        shaLine = (CARD32 *)shaBase + y * shaStride + scrLine / sizeof(CARD32);
118
119        off = scrLine / 8;              /* byte offset in bitplane scanline */
120        n = ((x & 31) + w + 31) / 32;   /* number of c2p units in scanline */
121
122        while (h--) {
123            sha = shaLine;
124            win = (CARD32 *) (*pBuf->window) (pScreen,
125                                              y,
126                                              off,
127                                              SHADOW_WINDOW_WRITE,
128                                              &winStride,
129                                              pBuf->closure);
130            if (!win)
131                return;
132            for (i = 0; i < n; i++) {
133                memcpy(d.bytes, sha, sizeof(d.bytes));
134                c2p_32x8(d.words);
135                store_afb8(win++, winStride, d.words);
136                sha += sizeof(d.bytes) / sizeof(*sha);
137            }
138            shaLine += shaStride;
139            y++;
140        }
141        pbox++;
142    }
143}
144