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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