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  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. }
  62.