rom/hyperlayers/dohookcliprects.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/debug.h>
   9 #include <aros/libcall.h>
  10 #include <exec/types.h>
  11
  12 #include "layers_intern.h"
  13 #include "basicfuncs.h"
  14 /*****************************************************************************
  15
  16     NAME */
  17 #include <proto/layers.h>
  18
  19         AROS_LH3(void, DoHookClipRects,
  20
  21 /*  SYNOPSIS */
  22         AROS_LHA(struct Hook      *, hook ,  A0),
  23         AROS_LHA(struct RastPort  *, rport,  A1),
  24         AROS_LHA(struct Rectangle *, rect ,  A2),
  25
  26 /*  LOCATION */
  27         struct LayersBase *, LayersBase, 36, Layers)
  28
  29 /*  FUNCTION
  30
  31     INPUTS
  32         hook  - pointer to the hook to be called for the cliprects of
  33                 the given layer
  34
  35         rport - pointer to the rastport where the layers upon which the
  36                 hook is to be called
  37
  38         rect  - no operation is allowed outside this rectangle. If a layer
  39                 is bigger than this rectangle only operations in the
  40                 common area are allowed.
  41
  42     RESULT
  43
  44     NOTES
  45
  46     EXAMPLE
  47
  48     BUGS
  49
  50     SEE ALSO
  51
  52     INTERNALS
  53
  54     HISTORY
  55         27-11-96    digulla automatically created from
  56                             layers_lib.fd and clib/layers_protos.h
  57
  58 *****************************************************************************/
  59 { /* sv */
  60     AROS_LIBFUNC_INIT
  61
  62     struct Layer     *L;
  63
  64     D(bug("DoHookClipRects(hook @ $%lx, rport @ $%lx, rect @ $%lx)\n", hook, rport, rect));
  65
  66     /* if the hook is LAYERS_NOBACKFILL then I am not doing anything here. */
  67     if(hook == (struct Hook *)LAYERS_NOBACKFILL)
  68     {
  69         return;
  70     }
  71
  72     L = rport -> Layer;
  73     /* does this rastport have a layer?? */
  74     if( NULL == L )
  75     {
  76         /* non-layered rastport */
  77
  78         /* You MUST supply a rect to clip the hook's actions! */
  79         _CallLayerHook(hook, rport, NULL, rect, rect->MinX, rect->MinY, LayersBase);
  80     }
  81     else
  82     {
  83         struct Rectangle boundrect;
  84
  85         /* layered rastport */
  86
  87         /* I assume that the given bounds rectangle is relative to the upper left corner of the
  88            layer's rastport. This makes more sense than if it was relative to the rastport of
  89            the screen where this layer is to be found in
  90         */
  91
  92         LockLayer(0, L);
  93
  94         boundrect.MinX = rect->MinX + L->bounds.MinX - L->Scroll_X;
  95         boundrect.MinY = rect->MinY + L->bounds.MinY - L->Scroll_Y;
  96         boundrect.MaxX = rect->MaxX + L->bounds.MinX - L->Scroll_X;
  97         boundrect.MaxY = rect->MaxY + L->bounds.MinY - L->Scroll_Y;
  98
  99         /* first check whether this layer is to be considered at all */
 100         if (!(boundrect.MinX > L->bounds.MaxX ||
 101               boundrect.MinY > L->bounds.MaxY ||
 102               boundrect.MaxX < L->bounds.MinX ||
 103               boundrect.MaxY < L->bounds.MinY))
 104         {
 105             /* yes, that's a layer to be considered */
 106             /* I want nobody else to interrupt me while I call the hook for this layer */
 107             struct ClipRect * CR;
 108
 109             CR = L->ClipRect; /* must not read this before LockLayer!! */
 110
 111         #if 0 /* stegerg: seems to have been crap idea/test. Where the hell did I get this from??? */
 112             /*
 113             ** Set rport->Layer to NULL, so that the hook function does not
 114             ** need to clone the rport and set clonerp->Layer to NULL in
 115             ** order to used rastport based gfx functions
 116             **
 117             ** stegerg: AFAIK this is done only since Kickstart 3.1
 118             */
 119
 120             rport->Layer = NULL;
 121         #endif
 122
 123             /* process all ClipRects of this layer */
 124             while (NULL != CR)
 125             {
 126                 /* I am going to call the hook for all visible cliprects and
 127                    for invisible cliprects belonging to smart or superbitmap
 128                    layers =>
 129                    So I am not calling it for invisble cliprects belonging to
 130                    a simple layer.
 131                 */
 132
 133                 if (!(NULL != CR->lobs &&
 134                       0    != (L->Flags & LAYERSIMPLE)) )
 135                 {
 136                     struct Rectangle bounds;
 137                     /* That's a ClipRect to visit, if it's inside the given rectangle */
 138                     /* Generate the bounds rectangle. This rectangle shows the part
 139                        of the clipRect that is supposed to be changed. So it might get
 140                        the coordinates of the ClipRect, but it can also be smaller. */
 141
 142                     bounds.MinX = (boundrect.MinX > CR->bounds.MinX) ? boundrect.MinX
 143                                                                      : CR->bounds.MinX;
 144                     bounds.MinY = (boundrect.MinY > CR->bounds.MinY) ? boundrect.MinY
 145                                                                      : CR->bounds.MinY;
 146                     bounds.MaxX = (boundrect.MaxX < CR->bounds.MaxX) ? boundrect.MaxX
 147                                                                      : CR->bounds.MaxX;
 148                     bounds.MaxY = (boundrect.MaxY < CR->bounds.MaxY) ? boundrect.MaxY
 149                                                                      : CR->bounds.MaxY;
 150
 151                     /* Is the cliprect inside the bounds... */
 152                     if (bounds.MinX <= bounds.MaxX && bounds.MinY <= bounds.MaxY)
 153                     {
 154                         struct BitMap * bm;
 155                         WORD offsetX = bounds.MinX - L->bounds.MinX + L->Scroll_X; /* + scrollx is correct! */
 156                         WORD offsetY = bounds.MinY - L->bounds.MinY + L->Scroll_Y; /* + scrolly is correct! */
 157
 158                         /* Call the hook for the rectangle given by bounds. */
 159
 160                         /* If the ClipRect is hidden, then this might get special..., but
 161                            only for non-simple layers, which are already ignored by an if
 162                            further above */
 163                         if (NULL != CR->lobs)
 164                         {
 165                             bm = rport->BitMap;
 166
 167                             if (0 != (L->Flags & LAYERSUPER))
 168                             {
 169                                 /* it's a superbitmap layer */
 170                                 bounds.MinX -= ( L->bounds.MinX + L->Scroll_X );
 171                                 bounds.MinY -= ( L->bounds.MinY + L->Scroll_Y );
 172                                 bounds.MaxX -= ( L->bounds.MinX + L->Scroll_X );
 173                                 bounds.MaxY -= ( L->bounds.MinY + L->Scroll_Y );
 174                                 rport->BitMap = L->SuperBitMap;
 175                             }
 176                             else
 177                             {
 178                                 /* it's a smart layer but not superbitmap */
 179                                 /* it's hidden, the hook has to blit into the hidden cliprect's bitmap now */
 180                                 /* adjust the bounds */
 181                                 bounds.MinX = bounds.MinX - CR->bounds.MinX + ALIGN_OFFSET(CR->bounds.MinX);
 182                                 bounds.MinY = bounds.MinY - CR->bounds.MinY;
 183                                 bounds.MaxX = bounds.MaxX - CR->bounds.MinX + ALIGN_OFFSET(CR->bounds.MinX);
 184                                 bounds.MaxY = bounds.MaxY - CR->bounds.MinY;
 185                                 rport->BitMap = CR->BitMap;
 186                             }
 187
 188                             _CallLayerHook(hook, rport, L, &bounds, offsetX, offsetY, LayersBase);
 189                             rport->BitMap = bm;
 190
 191                         } /* hidden cliprect */
 192                         else
 193                         {
 194                            _CallLayerHook(hook, rport, L, &bounds, offsetX, offsetY, LayersBase);
 195                         } /* visible cliprect */
 196
 197                     } /* if (cliprect intersects rect in screen coords) */
 198
 199                 } /* ignore hidden simple refresh cliprects */
 200
 201                 CR = CR->Next;
 202
 203             } /* foreach cliprect */
 204
 205         #if 0 /* stegerg: seems to have been crap idea/test. Where the hell did I get this from??? */
 206
 207             /* Restore RastPort->Layer which was set to NULL further above */
 208
 209             rport->Layer = L;
 210         #endif
 211
 212         } /* if (rect in screen coords interesects layer coords) */
 213
 214         UnlockLayer(L);
 215
 216     } /* if (layered rastport) */
 217
 218     AROS_LIBFUNC_EXIT
 219 } /* DoHookClipRects */
 220
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