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   {
  79       damage_region = NewRegion();
  80       if (damage_region)
  81       {
  82         if (!OrRegionRegion(l->DamageList, damage_region))
  83         {
  84             DisposeRegion(damage_region);
  85             damage_region = NULL;
  86         }
  87       }
  88   }
  89
  90   if (!damage_region)
  91   {
  92       /* CHECKME: Should we really unlock on error? */
  93       UnlockLayer(l);
  94       return FALSE;
  95   }
  96
  97   /* The DamageList is in layer coords. So convert it to screen coords */
  98
  99   _TranslateRect(&damage_region->bounds, l->bounds.MinX, l->bounds.MinY);
 100
 101   AndRectRegion(damage_region, &l->bounds);
 102
 103   visible_damage_region = AndRegionRegionND(l->VisibleRegion, damage_region);
 104   AndRegionRegion(l->visibleshape, visible_damage_region);
 105
 106   if (l->shaperegion)
 107   {
 108     _TranslateRect(&visible_damage_region->bounds, -l->bounds.MinX, -l->bounds.MinY);
 109     AndRegionRegion(l->shaperegion, visible_damage_region);
 110     _TranslateRect(&visible_damage_region->bounds, l->bounds.MinX, l->bounds.MinY);
 111   }
 112
 113   l->ClipRect = _CreateClipRectsFromRegion(visible_damage_region,
 114                                            l,
 115                                            FALSE,
 116                                            damage_region,
 117                                            LayersBase);
 118
 119   if (IS_SMARTREFRESH(l))
 120   {
 121       _CopyClipRectsToClipRects(l,
 122                                 l->cr2,
 123                                 l->ClipRect,
 124                                 0,
 125                                 0,
 126                                 FALSE,
 127                                 FALSE,
 128                                 FALSE,
 129                                 LayersBase);
 130
 131   }
 132
 133   DisposeRegion(damage_region);
 134   DisposeRegion(visible_damage_region);
 135
 136   /*
 137   ** Must not set flag before InstallClipRegion!!! Keep this order!!!
 138   */
 139   l-> Flags |= LAYERUPDATING;
 140
 141   return TRUE;
 142
 143   AROS_LIBFUNC_EXIT
 144 } /* BeginUpdate */