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 16 8-bit pixels, stored in 4 32-bit words
49     *  containing
50     *    - 16 8-bit chunky pixels on input
51     *    - permutated planar data (2 planes per 32-bit word) on output
52     */
53
54static void c2p_16x8(CARD32 d[4])
55{
56    transp4(d, 8, 2);
57    transp4(d, 1, 2);
58    transp4x(d, 16, 2);
59    transp4x(d, 2, 2);
60    transp4(d, 4, 1);
61}
62
63
64    /*
65     *  Store a full block of permutated iplan2p8 data after c2p conversion
66     */
67
68static inline void store_iplan2p8(void *dst, const CARD32 d[4])
69{
70    CARD32 *p = dst;
71
72    *p++ = d[1];
73    *p++ = d[3];
74    *p++ = d[0];
75    *p++ = d[2];
76}
77
78
79void
80shadowUpdateIplan2p8(ScreenPtr pScreen, shadowBufPtr pBuf)
81{
82    RegionPtr damage = DamageRegion(pBuf->pDamage);
83    PixmapPtr pShadow = pBuf->pPixmap;
84    int nbox = RegionNumRects(damage);
85    BoxPtr pbox = RegionRects(damage);
86    FbBits *shaBase;
87    CARD16 *shaLine, *sha;
88    FbStride shaStride;
89    int scrLine;
90    _X_UNUSED int shaBpp, shaXoff, shaYoff;
91    int x, y, w, h;
92    int i, n;
93    CARD16 *win;
94    _X_UNUSED CARD32 winSize;
95    union {
96        CARD8 bytes[16];
97        CARD32 words[4];
98    } d;
99
100    fbGetDrawable(&pShadow->drawable, shaBase, shaStride, shaBpp, shaXoff,
101                  shaYoff);
102    shaStride *= sizeof(FbBits) / sizeof(CARD16);
103
104    while (nbox--) {
105        x = pbox->x1;
106        y = pbox->y1;
107        w = pbox->x2 - pbox->x1;
108        h = pbox->y2 - pbox->y1;
109
110        scrLine = x & -16;
111        shaLine = (CARD16 *)shaBase + y * shaStride + scrLine / sizeof(CARD16);
112
113        n = ((x & 15) + w + 15) / 16;   /* number of c2p units in scanline */
114
115        while (h--) {
116            sha = shaLine;
117            win = (CARD16 *) (*pBuf->window) (pScreen,
118                                              y,
119                                              scrLine,
120                                              SHADOW_WINDOW_WRITE,
121                                              &winSize,
122                                              pBuf->closure);
123            if (!win)
124                return;
125            for (i = 0; i < n; i++) {
126                memcpy(d.bytes, sha, sizeof(d.bytes));
127                c2p_16x8(d.words);
128                store_iplan2p8(win, d.words);
129                sha += sizeof(d.bytes) / sizeof(*sha);
130                win += sizeof(d.bytes) / sizeof(*win);
131            }
132            shaLine += shaStride;
133            y++;
134        }
135        pbox++;
136    }
137}
138