shpacked.c revision 1b5d61b8 
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
43void
44shadowUpdatePacked(ScreenPtr pScreen, shadowBufPtr pBuf)
45{
46    RegionPtr damage = DamageRegion(pBuf->pDamage);
47    PixmapPtr pShadow = pBuf->pPixmap;
48    int nbox = RegionNumRects(damage);
49    BoxPtr pbox = RegionRects(damage);
50    FbBits *shaBase, *shaLine, *sha;
51    FbStride shaStride;
52    int scrBase, scrLine, scr;
53    int shaBpp;
54    _X_UNUSED int shaXoff, shaYoff;
55    int x, y, w, h, width;
56    int i;
57    FbBits *winBase = NULL, *win;
58    CARD32 winSize;
59
60    fbGetDrawable(&pShadow->drawable, shaBase, shaStride, shaBpp, shaXoff,
61                  shaYoff);
62    while (nbox--) {
63        x = pbox->x1 * shaBpp;
64        y = pbox->y1;
65        w = (pbox->x2 - pbox->x1) * shaBpp;
66        h = pbox->y2 - pbox->y1;
67
68        scrLine = (x >> FB_SHIFT);
69        shaLine = shaBase + y * shaStride + (x >> FB_SHIFT);
70
71        x &= FB_MASK;
72        w = (w + x + FB_MASK) >> FB_SHIFT;
73
74        while (h--) {
75            winSize = 0;
76            scrBase = 0;
77            width = w;
78            scr = scrLine;
79            sha = shaLine;
80            while (width) {
81                /* how much remains in this window */
82                i = scrBase + winSize - scr;
83                if (i <= 0 || scr < scrBase) {
84                    winBase = (FbBits *) (*pBuf->window) (pScreen,
85                                                          y,
86                                                          scr * sizeof(FbBits),
87                                                          SHADOW_WINDOW_WRITE,
88                                                          &winSize,
89                                                          pBuf->closure);
90                    if (!winBase)
91                        return;
92                    scrBase = scr;
93                    winSize /= sizeof(FbBits);
94                    i = winSize;
95                }
96                win = winBase + (scr - scrBase);
97                if (i > width)
98                    i = width;
99                width -= i;
100                scr += i;
101                memcpy(win, sha, i * sizeof(FbBits));
102                sha += i;
103            }
104            shaLine += shaStride;
105            y++;
106        }
107        pbox++;
108    }
109}
110