components/x11/libdga/src/mbufset.c

   1 /* Copyright (c) 1993, 1997, Oracle and/or its affiliates. All rights reserved.
   2  *
   3  * Permission is hereby granted, free of charge, to any person obtaining a
   4  * copy of this software and associated documentation files (the "Software"),
   5  * to deal in the Software without restriction, including without limitation
   6  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   7  * and/or sell copies of the Software, and to permit persons to whom the
   8  * Software is furnished to do so, subject to the following conditions:
   9  *
  10  * The above copyright notice and this permission notice (including the next
  11  * paragraph) shall be included in all copies or substantial portions of the
  12  * Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  20  * DEALINGS IN THE SOFTWARE.
  21  */
  22
  23
  24 /*
  25 ** mbufset.c - Routines to manipulate multibuffer set objects.
  26 */
  27
  28 #include <malloc.h>
  29 #ifdef SERVER_DGA
  30 #include <X11/Xlib.h>
  31 #endif /* SERVER_DGA */
  32 #include "dga_incls.h"
  33 #include "pix_grab.h"
  34 #include "mbufsetstr.h"
  35
  36 static void dgai_mbufset_destroy (DgaMbufSetPtr pMbs);
  37
  38 extern int dga_pixlist_add(Dga_token token, Display *dpy, Pixmap pix);
  39
  40 /*
  41 ** Create a client-side multibuffer set object based on information
  42 ** in the shinfo of a window.  The window must be locked prior to calling.
  43 */
  44
  45 DgaMbufSetPtr
  46 dgai_mbufset_create (_Dga_window dgawin)
  47 {
  48     DgaMbufSetPtr       pMbs;
  49     WXINFO              *infop;
  50     DgaMbufSetShinfoPtr pMbsInfo;
  51     short               numBufs, i;
  52     unsigned long       bufViewableFlags, bufMask;
  53     Dga_token           token;
  54     _Dga_pixmap         dgapix;
  55     XID                 *pShinfoId;
  56
  57     infop = (WXINFO *) dgawin->w_info;
  58     pMbsInfo = &infop->w_mbsInfo;
  59     token = (Dga_token) pMbsInfo->nmbufShpxToken;
  60     pShinfoId = &(pMbsInfo->nmbufIds[0]);
  61
  62     /* allocate mbufset client structure */
  63     if (!(pMbs = (DgaMbufSetPtr) malloc(sizeof(DgaMbufSet)))) {
  64         return (NULL);
  65     }
  66
  67     numBufs = infop->wx_dbuf.number_buffers;
  68     pMbs->numBufs = numBufs;
  69
  70     for (i = 0; i < numBufs;  i++) {
  71         pMbs->pNbPixmaps[i] = NULL;
  72     }
  73
  74     bufViewableFlags = pMbsInfo->bufViewableFlags;
  75     bufMask = 1L;
  76     for (i = 0; i < numBufs;  i++, pShinfoId++) {
  77         if (!(bufViewableFlags & bufMask)) {
  78             if (!dga_pixlist_add(token, dgawin->w_dpy, (Pixmap)*pShinfoId) ||
  79                 !(dgapix = dga_pix_grab(token, (Pixmap)*pShinfoId))) {
  80                 goto Bad;
  81             }
  82             pMbs->pNbPixmaps[i] = dgapix;
  83             pMbs->pNbShinfo[i] = (SHARED_PIXMAP_INFO *)dgapix->p_infop;
  84         } else {
  85             pMbs->pNbShinfo[i] = NULL;
  86         }
  87         pMbs->mbufseq[i] = 0;
  88         pMbs->clipseq[i] = 0;
  89         pMbs->curseq[i] = 0;
  90         pMbs->cacheSeqs[i] = 0;
  91         pMbs->devInfoSeqs[i] = 0;
  92         pMbs->prevLocked[i] = 0;
  93         bufMask = bufMask << 1;
  94     }
  95
  96     /* success */
  97     pMbs->refcnt = 1;
  98     return (pMbs);
  99
 100 Bad:
 101     dgai_mbufset_destroy(pMbs);
 102     return (NULL);
 103 }
 104
 105
 106 void
 107 dgai_mbufset_incref (DgaMbufSetPtr pMbs)
 108 {
 109     pMbs->refcnt++;
 110 }
 111
 112
 113 static void
 114 dgai_mbufset_destroy (DgaMbufSetPtr pMbs)
 115 {
 116     short i;
 117
 118     for (i = 0; i < pMbs->numBufs;  i++) {
 119         if (pMbs->pNbPixmaps[i]) {
 120             dga_pix_ungrab(pMbs->pNbPixmaps[i]);
 121         }
 122     }
 123     free(pMbs);
 124 }
 125
 126 void
 127 dgai_mbufset_decref (DgaMbufSetPtr pMbs)
 128 {
 129     if ((int)(--(pMbs->refcnt)) <= 0) {
 130         dgai_mbufset_destroy(pMbs);
 131     }
 132 }
 133
 134