xorg-server-1.4/hw/kdrive/src/kshadow.c

   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
  28 Bool
  29 KdShadowFbAlloc (KdScreenInfo *screen, int fb, 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[fb].bitsPerPixel;
  36
  37     /* use fb computation for width */
  38     paddedWidth = ((width * bpp + FB_MASK) >> FB_SHIFT) * sizeof (FbBits);
  39     buf = xalloc (paddedWidth * height);
  40     if (!buf)
  41         return FALSE;
  42     if (screen->fb[fb].shadow)
  43         xfree (screen->fb[fb].frameBuffer);
  44     screen->fb[fb].shadow = TRUE;
  45     screen->fb[fb].frameBuffer = buf;
  46     screen->fb[fb].byteStride = paddedWidth;
  47     screen->fb[fb].pixelStride = paddedWidth * 8 / bpp;
  48     return TRUE;
  49 }
  50
  51 void
  52 KdShadowFbFree (KdScreenInfo *screen, int fb)
  53 {
  54     if (screen->fb[fb].shadow)
  55     {
  56         xfree (screen->fb[fb].frameBuffer);
  57         screen->fb[fb].frameBuffer = 0;
  58         screen->fb[fb].shadow = FALSE;
  59     }
  60 }
  61
  62 Bool
  63 KdShadowSet (ScreenPtr pScreen, int randr, ShadowUpdateProc update, ShadowWindowProc window)
  64 {
  65     KdScreenPriv(pScreen);
  66     KdScreenInfo *screen = pScreenPriv->screen;
  67     int  fb;
  68
  69     shadowRemove (pScreen, pScreen->GetScreenPixmap(pScreen));
  70     for (fb = 0; fb < KD_MAX_FB && screen->fb[fb].depth; fb++)
  71     {
  72         if (screen->fb[fb].shadow)
  73             return shadowAdd (pScreen, pScreen->GetScreenPixmap(pScreen),
  74                               update, window, randr, 0);
  75     }
  76     return TRUE;
  77 }
  78
  79 void
  80 KdShadowUnset (ScreenPtr pScreen)
  81 {
  82     shadowRemove(pScreen, pScreen->GetScreenPixmap(pScreen));
  83 }