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_DIX_CONFIG_H
24#include <dix-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 = xallocarray(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        free(screen->fb.frameBuffer);
56        screen->fb.frameBuffer = 0;
57        screen->fb.shadow = FALSE;
58    }
59}
60
61Bool
62KdShadowSet(ScreenPtr pScreen, int randr, ShadowUpdateProc update,
63            ShadowWindowProc window)
64{
65    KdScreenPriv(pScreen);
66    KdScreenInfo *screen = pScreenPriv->screen;
67
68    shadowRemove(pScreen, pScreen->GetScreenPixmap(pScreen));
69    if (screen->fb.shadow) {
70        return shadowAdd(pScreen, pScreen->GetScreenPixmap(pScreen),
71                         update, window, randr, 0);
72    }
73    return TRUE;
74}
75
76void
77KdShadowUnset(ScreenPtr pScreen)
78{
79    shadowRemove(pScreen, pScreen->GetScreenPixmap(pScreen));
80}
81