rom/hyperlayers/beginupdate.c

   1 /*
   2     Copyright © 1995-2007, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: english
   7 */
   8 #include <aros/libcall.h>
   9 #include <graphics/clip.h>
  10 #include <exec/types.h>
  11 #include <proto/exec.h>
  12 #include <graphics/layers.h>
  13 #include <proto/graphics.h>
  14 #include <proto/layers.h>
  15 #include "layers_intern.h"
  16 #include "basicfuncs.h"
  17
  18 /*****************************************************************************
  19
  20     NAME */
  21
  22         AROS_LH1(LONG, BeginUpdate,
  23
  24 /*  SYNOPSIS */
  25         AROS_LHA(struct Layer *, l, A0),
  26
  27 /*  LOCATION */
  28         struct LayersBase *, LayersBase, 13, Layers)
  29
  30 /*  FUNCTION
  31         Converts the damage list to ClipRects and exchanges the
  32         two lists for faster redrawing. This routine allows a
  33         faster update of the display as it will only be rendered
  34         in the damaged areas.
  35         This routine will automatically lock the layer to prevent
  36         changes.
  37
  38     INPUTS
  39         l - pointer to layer
  40
  41     RESULT
  42         TRUE  if damage list conversion was successful
  43         FALSE if list could not be converted.
  44
  45     NOTES
  46
  47     EXAMPLE
  48
  49     BUGS
  50
  51     SEE ALSO
  52       EndUpdate()
  53
  54     INTERNALS
  55
  56     HISTORY
  57         27-11-96    digulla automatically created from
  58                             layers_lib.fd and clib/layers_protos.h
  59
  60 *****************************************************************************/
  61 {
  62   AROS_LIBFUNC_INIT
  63
  64   struct Region *damage_region, *visible_damage_region;
  65   /*
  66   ** Convert the list of regionrectangles in the damage list
  67   ** to a cliprect list.
  68   */
  69
  70   LockLayer(0, l);
  71
  72   l->cr2 = l->ClipRect;
  73
  74
  75   if (l->ClipRegion)
  76       damage_region = AndRegionRegionND(l->ClipRegion, l->DamageList);
  77   else
  78       damage_region = CopyRegion(l->DamageList);
  79
  80   /* The DamageList is in layer coords. So convert it to screen coords */
  81
  82   _TranslateRect(&damage_region->bounds, l->bounds.MinX, l->bounds.MinY);
  83
  84   AndRectRegion(damage_region, &l->bounds);
  85
  86   visible_damage_region = AndRegionRegionND(l->VisibleRegion, damage_region);
  87   AndRegionRegion(l->visibleshape, visible_damage_region);
  88
  89   if (l->shaperegion)
  90   {
  91     _TranslateRect(&visible_damage_region->bounds, -l->bounds.MinX, -l->bounds.MinY);
  92     AndRegionRegion(l->shaperegion, visible_damage_region);
  93     _TranslateRect(&visible_damage_region->bounds, l->bounds.MinX, l->bounds.MinY);
  94   }
  95
  96   l->ClipRect = _CreateClipRectsFromRegion(visible_damage_region,
  97                                            l,
  98                                            FALSE,
  99                                            damage_region,
 100                                            LayersBase);
 101
 102   if (IS_SMARTREFRESH(l))
 103   {
 104       _CopyClipRectsToClipRects(l,
 105                                 l->cr2,
 106                                 l->ClipRect,
 107                                 0,
 108                                 0,
 109                                 FALSE,
 110                                 FALSE,
 111                                 FALSE,
 112                                 LayersBase);
 113
 114   }
 115
 116   DisposeRegion(damage_region);
 117   DisposeRegion(visible_damage_region);
 118
 119   /*
 120   ** Must not set flag before InstallClipRegion!!! Keep this order!!!
 121   */
 122   l-> Flags |= LAYERUPDATING;
 123
 124   return TRUE;
 125
 126   AROS_LIBFUNC_EXIT
 127 } /* BeginUpdate */