kshadow.c revision 706f2543 
1/*
2 * Copyright � 1999 Keith Packard
3 *
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that
7 * copyright notice and this permission notice appear in supporting
8 * documentation, and that the name of Keith Packard not be used in
9 * advertising or publicity pertaining to distribution of the software without
10 * specific, written prior permission.  Keith Packard makes no
11 * representations about the suitability of this software for any purpose.  It
12 * is provided "as is" without express or implied warranty.
13 *
14 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
20 * PERFORMANCE OF THIS SOFTWARE.
21 */
22
23#ifdef HAVE_CONFIG_H
24#include <kdrive-config.h>
25#endif
26#include "kdrive.h"
27
28Bool
29KdShadowFbAlloc (KdScreenInfo *screen, Bool rotate)
30{
31    int	    paddedWidth;
32    void    *buf;
33    int	    width = rotate ? screen->height : screen->width;
34    int	    height = rotate ? screen->width : screen->height;
35    int	    bpp = screen->fb.bitsPerPixel;
36
37    /* use fb computation for width */
38    paddedWidth = ((width * bpp + FB_MASK) >> FB_SHIFT) * sizeof (FbBits);
39    buf = malloc(paddedWidth * height);
40    if (!buf)
41	return FALSE;
42    if (screen->fb.shadow)
43	free(screen->fb.frameBuffer);
44    screen->fb.shadow = TRUE;
45    screen->fb.frameBuffer = buf;
46    screen->fb.byteStride = paddedWidth;
47    screen->fb.pixelStride = paddedWidth * 8 / bpp;
48    return TRUE;
49}
50
51void
52KdShadowFbFree (KdScreenInfo *screen)
53{
54    if (screen->fb.shadow)
55    {
56	free(screen->fb.frameBuffer);
57	screen->fb.frameBuffer = 0;
58	screen->fb.shadow = FALSE;
59    }
60}
61
62Bool
63KdShadowSet (ScreenPtr pScreen, int randr, ShadowUpdateProc update, ShadowWindowProc window)
64{
65    KdScreenPriv(pScreen);
66    KdScreenInfo *screen = pScreenPriv->screen;
67
68    shadowRemove (pScreen, pScreen->GetScreenPixmap(pScreen));
69    if(screen->fb.shadow)
70    {
71	return shadowAdd (pScreen, pScreen->GetScreenPixmap(pScreen),
72			  update, window, randr, 0);
73    }
74    return TRUE;
75}
76
77void
78KdShadowUnset (ScreenPtr pScreen)
79{
80    shadowRemove(pScreen, pScreen->GetScreenPixmap(pScreen));
81}
82