rom/hyperlayers/beginupdate.c

   1 /*
   2     Copyright © 1995-2001, 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   AROS_LIBBASE_EXT_DECL(struct LayersBase *,LayersBase)
  64
  65   struct Region *damage_region, *visible_damage_region;
  66   /*
  67   ** Convert the list of regionrectangles in the damage list
  68   ** to a cliprect list.
  69   */
  70
  71   LockLayer(0, l);
  72
  73   l->cr2 = l->ClipRect;
  74
  75
  76   if (l->ClipRegion)
  77       damage_region = AndRegionRegionND(l->ClipRegion, l->DamageList);
  78   else
  79       damage_region = CopyRegion(l->DamageList);
  80
  81   /* The DamageList is in layer coords. So convert it to screen coords */
  82
  83   _TranslateRect(&damage_region->bounds, l->bounds.MinX, l->bounds.MinY);
  84
  85   AndRectRegion(damage_region, &l->bounds);
  86
  87   visible_damage_region = AndRegionRegionND(l->VisibleRegion, damage_region);
  88   AndRegionRegion(l->visibleshape, visible_damage_region);
  89
  90   if (l->shaperegion)
  91   {
  92     _TranslateRect(&visible_damage_region->bounds, -l->bounds.MinX, -l->bounds.MinY);
  93     AndRegionRegion(l->shaperegion, visible_damage_region);
  94     _TranslateRect(&visible_damage_region->bounds, l->bounds.MinX, l->bounds.MinY);
  95   }
  96
  97   l->ClipRect = _CreateClipRectsFromRegion(visible_damage_region,
  98                                            l,
  99                                            FALSE,
 100                                            damage_region,
 101                                            LayersBase);
 102
 103   if (IS_SMARTREFRESH(l))
 104   {
 105       _CopyClipRectsToClipRects(l,
 106                                 l->cr2,
 107                                 l->ClipRect,
 108                                 0,
 109                                 0,
 110                                 FALSE,
 111                                 FALSE,
 112                                 FALSE,
 113                                 LayersBase);
 114
 115   }
 116
 117   DisposeRegion(damage_region);
 118   DisposeRegion(visible_damage_region);
 119
 120   /*
 121   ** Must not set flag before InstallClipRegion!!! Keep this order!!!
 122   */
 123   l-> Flags |= LAYERUPDATING;
 124
 125   return TRUE;
 126
 127   AROS_LIBFUNC_EXIT
 128 } /* BeginUpdate */