src/gallium/winsys/svga/drm/vmw_surface.c

   1 /**********************************************************
   2  * Copyright 2009 VMware, Inc.  All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  **********************************************************/
  25
  26
  27 #include "svga_cmd.h"
  28 #include "util/u_debug.h"
  29 #include "util/u_memory.h"
  30
  31 #include "vmw_surface.h"
  32 #include "vmw_screen.h"
  33
  34 void
  35 vmw_svga_winsys_surface_reference(struct vmw_svga_winsys_surface **pdst,
  36                                   struct vmw_svga_winsys_surface *src)
  37 {
  38    struct pipe_reference *src_ref;
  39    struct pipe_reference *dst_ref;
  40    struct vmw_svga_winsys_surface *dst;
  41
  42    if(pdst == NULL || *pdst == src)
  43       return;
  44
  45    dst = *pdst;
  46
  47    src_ref = src ? &src->refcnt : NULL;
  48    dst_ref = dst ? &dst->refcnt : NULL;
  49
  50    if (pipe_reference(dst_ref, src_ref)) {
  51       vmw_ioctl_surface_destroy(dst->screen, dst->sid);
  52 #ifdef DEBUG
  53       /* to detect dangling pointers */
  54       assert(p_atomic_read(&dst->validated) == 0);
  55       dst->sid = SVGA3D_INVALID_ID;
  56 #endif
  57       FREE(dst);
  58    }
  59
  60    *pdst = src;
  61 }