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.
  32     The ScreenBuffer's BitMap will be installed on the specifies screen,
  33     if possible.
  34     After a signal from graphics.library, the previously installed
  35     BitMap will be available for re-use.
  36     Consult graphics.library/AllocDBufInfo() and
  37     graphics.library/ChangeVPBitMap() for further information.
  38
  39     INPUTS
  40     screen - The screen this screenbuffer belongs to
  41     screenbuffer - The screenbuffer obtained by AllocScreenBuffer()
  42
  43     RESULT
  44     Non-zero if fuction succeeded, or zero if operation could not be
  45     performed, eg. if user selects menus or gadgets.
  46
  47     NOTES
  48     You need not re-install the original ScreenBuffer before closing
  49     a screen. Just FreeScreenBuffer() all buffers used for that screen.
  50
  51     EXAMPLE
  52
  53     BUGS
  54
  55     SEE ALSO
  56     AllocScreenBuffer(), FreeScreenBuffer(),
  57     graphics.library/ChangeVPBitMap()
  58
  59     INTERNALS
  60
  61     HISTORY
  62
  63 *****************************************************************************/
  64 {
  65     AROS_LIBFUNC_INIT
  66
  67     struct GfxBase *GfxBase = GetPrivIBase(IntuitionBase)->GfxBase;
  68     //struct IIHData   *iihdata;
  69     ULONG lock;
  70
  71     if (!screen) return 0;
  72     if (!screenbuffer) return 0;
  73
  74     #if 0
  75     if (MENUS_ACTIVE) return 0;
  76     iihdata = (struct IIHData *)((struct IntIntuitionBase *)(IntuitionBase))->InputHandler->is_Data;
  77     if (iihdata->ActiveGadget) return 0;
  78     #endif
  79
  80     lock = LockIBase(0);
  81
  82     ChangeVPBitMap(&screen->ViewPort,screenbuffer->sb_BitMap,screenbuffer->sb_DBufInfo);
  83
  84     screen->RastPort.BitMap = screenbuffer->sb_BitMap;
  85     UpdateScreenBitMap(screen, IntuitionBase);
  86
  87     UnlockIBase(lock);
  88
  89     return TRUE;
  90
  91     AROS_LIBFUNC_EXIT
  92 } /* ChangeScreenBuffer */
  93
  94 void UpdateScreenBitMap(struct Screen *screen, struct IntuitionBase *IntuitionBase)
  95 {
  96     int i;
  97     struct BitMap *bm = screen->RastPort.BitMap;
  98     struct GfxBase *GfxBase = GetPrivIBase(IntuitionBase)->GfxBase;
  99
 100     /* Patch up the obsolete screen bitmap as best we can for old programs
 101      */
 102     screen->BitMap_OBSOLETE.BytesPerRow = GetBitMapAttr(bm, BMA_WIDTH) / 8;
 103     screen->BitMap_OBSOLETE.Rows = GetBitMapAttr(bm, BMA_HEIGHT);
 104     screen->BitMap_OBSOLETE.Flags = BMF_INVALID | (GetBitMapAttr(bm, BMA_FLAGS) & BMF_STANDARD);
 105     screen->BitMap_OBSOLETE.pad = 0;
 106     screen->BitMap_OBSOLETE.Depth = GetBitMapAttr(bm, BMA_DEPTH);
 107     for (i = 0; i < 8; i++) {
 108         /* And for *really* old programs, copy the plane pointers,
 109          * if possible
 110          */
 111         if (screen->BitMap_OBSOLETE.Flags & BMF_STANDARD)
 112             screen->BitMap_OBSOLETE.Planes[i] = bm->Planes[i];
 113         else
 114             screen->BitMap_OBSOLETE.Planes[i] = NULL;
 115     }
 116 }