rom/intuition/changescreenbuffer.c

   1 /*
   2     Copyright © 1995-2013, The AROS Development Team. All rights reserved.
   3     Copyright © 2001-2003, The MorphOS Development Team. All Rights Reserved.
   4     $Id$
   5
   6     Desc: Intuition function ChangeScreenBuffer()
   7     Lang: english
   8 */
   9 #include <proto/graphics.h>
  10 #include "intuition_intern.h"
  11 #include "inputhandler.h"
  12 #include "menus.h"
  13
  14 /*****************************************************************************
  15
  16     NAME */
  17 #include <intuition/screens.h>
  18 #include <proto/intuition.h>
  19
  20         AROS_LH2(ULONG, ChangeScreenBuffer,
  21
  22 /*  SYNOPSIS */
  23         AROS_LHA(struct Screen *      , screen, A0),
  24         AROS_LHA(struct ScreenBuffer *, screenbuffer, A1),
  25
  26 /*  LOCATION */
  27         struct IntuitionBase *, IntuitionBase, 130, Intuition)
  28
  29 /*  FUNCTION
  30         Do double or multiple buffering on an intuition screen in an
  31         intuition-cooperative way. The ScreenBuffer's BitMap will be
  32         installed on the specified screen, if possible. After a signal from
  33         graphics.library, the previously installed BitMap will be available
  34         for re-use. Consult graphics.library/AllocDBufInfo() and
  35         graphics.library/ChangeVPBitMap() for further information.
  36
  37     INPUTS
  38         screen - The screen this screenbuffer belongs to
  39         screenbuffer - The screenbuffer obtained by AllocScreenBuffer()
  40
  41     RESULT
  42         Non-zero if fuction succeeded, or zero if operation could not be
  43         performed, e.g. if user selects menus or gadgets.
  44
  45     NOTES
  46         You need not re-install the original ScreenBuffer before closing
  47         a screen. Just FreeScreenBuffer() all buffers used for that screen.
  48
  49     EXAMPLE
  50
  51     BUGS
  52
  53     SEE ALSO
  54         AllocScreenBuffer(), FreeScreenBuffer(),
  55         graphics.library/ChangeVPBitMap()
  56
  57     INTERNALS
  58
  59 *****************************************************************************/
  60 {
  61     AROS_LIBFUNC_INIT
  62
  63     struct GfxBase *GfxBase = GetPrivIBase(IntuitionBase)->GfxBase;
  64     //struct IIHData   *iihdata;
  65     ULONG lock;
  66
  67     if (!screen) return 0;
  68     if (!screenbuffer) return 0;
  69
  70     #if 0
  71     if (MENUS_ACTIVE) return 0;
  72     iihdata = (struct IIHData *)((struct IntIntuitionBase *)(IntuitionBase))->InputHandler->is_Data;
  73     if (iihdata->ActiveGadget) return 0;
  74     #endif
  75
  76     lock = LockIBase(0);
  77
  78     ChangeVPBitMap(&screen->ViewPort,screenbuffer->sb_BitMap,screenbuffer->sb_DBufInfo);
  79
  80     screen->RastPort.BitMap = screenbuffer->sb_BitMap;
  81     UpdateScreenBitMap(screen, IntuitionBase);
  82
  83     UnlockIBase(lock);
  84
  85     return TRUE;
  86
  87     AROS_LIBFUNC_EXIT
  88 } /* ChangeScreenBuffer */
  89
  90 void UpdateScreenBitMap(struct Screen *screen, struct IntuitionBase *IntuitionBase)
  91 {
  92     int i;
  93     struct BitMap *bm = screen->RastPort.BitMap;
  94     struct GfxBase *GfxBase = GetPrivIBase(IntuitionBase)->GfxBase;
  95
  96     /* Patch up the obsolete screen bitmap as best we can for old programs
  97      */
  98     screen->BitMap_OBSOLETE.BytesPerRow = GetBitMapAttr(bm, BMA_WIDTH) / 8;
  99     screen->BitMap_OBSOLETE.Rows = GetBitMapAttr(bm, BMA_HEIGHT);
 100     screen->BitMap_OBSOLETE.Flags = BMF_INVALID | (GetBitMapAttr(bm, BMA_FLAGS) & BMF_STANDARD);
 101     screen->BitMap_OBSOLETE.pad = 0;
 102     screen->BitMap_OBSOLETE.Depth = GetBitMapAttr(bm, BMA_DEPTH);
 103     for (i = 0; i < 8; i++) {
 104         /* And for *really* old programs, copy the plane pointers,
 105          * if possible
 106          */
 107         if (screen->BitMap_OBSOLETE.Flags & BMF_STANDARD)
 108             screen->BitMap_OBSOLETE.Planes[i] = bm->Planes[i];
 109         else
 110             screen->BitMap_OBSOLETE.Planes[i] = NULL;
 111     }
 112 }